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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2006-2007 Konstantin Shishkov

  4.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  *

  22.  */

  23. 

  24. /**

  25.  * @file vc1.c

  26.  * VC-1 and WMV3 decoder

  27.  *

  28.  */

  29. #include "common.h"

  30. #include "dsputil.h"

  31. #include "avcodec.h"

  32. #include "mpegvideo.h"

  33. #include "vc1data.h"

  34. #include "vc1acdata.h"

  35. 

  36. #undef NDEBUG

  37. #include <assert.h>

  38. 

  39. extern const uint32_t ff_table0_dc_lum[120][2], ff_table1_dc_lum[120][2];

  40. extern const uint32_t ff_table0_dc_chroma[120][2], ff_table1_dc_chroma[120][2];

  41. extern VLC ff_msmp4_dc_luma_vlc[2], ff_msmp4_dc_chroma_vlc[2];

  42. #define MB_INTRA_VLC_BITS 9

  43. extern VLC ff_msmp4_mb_i_vlc;

  44. extern const uint16_t ff_msmp4_mb_i_table[64][2];

  45. #define DC_VLC_BITS 9

  46. #define AC_VLC_BITS 9

  47. static const uint16_t table_mb_intra[64][2];

  48. 

  49. /** Markers used if VC-1 AP frame data */

  50. //@{

  51. enum VC1Code{

  52.     VC1_CODE_RES0       = 0x00000100,

  53.     VC1_CODE_ENDOFSEQ   = 0x0000010A,

  54.     VC1_CODE_SLICE,

  55.     VC1_CODE_FIELD,

  56.     VC1_CODE_FRAME,

  57.     VC1_CODE_ENTRYPOINT,

  58.     VC1_CODE_SEQHDR,

  59. };

  60. //@}

  61. 

  62. /** Available Profiles */

  63. //@{

  64. enum Profile {

  65.     PROFILE_SIMPLE,

  66.     PROFILE_MAIN,

  67.     PROFILE_COMPLEX, ///< TODO: WMV9 specific

  68.     PROFILE_ADVANCED

  69. };

  70. //@}

  71. 

  72. /** Sequence quantizer mode */

  73. //@{

  74. enum QuantMode {

  75.     QUANT_FRAME_IMPLICIT,    ///< Implicitly specified at frame level

  76.     QUANT_FRAME_EXPLICIT,    ///< Explicitly specified at frame level

  77.     QUANT_NON_UNIFORM,       ///< Non-uniform quant used for all frames

  78.     QUANT_UNIFORM            ///< Uniform quant used for all frames

  79. };

  80. //@}

  81. 

  82. /** Where quant can be changed */

  83. //@{

  84. enum DQProfile {

  85.     DQPROFILE_FOUR_EDGES,

  86.     DQPROFILE_DOUBLE_EDGES,

  87.     DQPROFILE_SINGLE_EDGE,

  88.     DQPROFILE_ALL_MBS

  89. };

  90. //@}

  91. 

  92. /** @name Where quant can be changed

  93.  */

  94. //@{

  95. enum DQSingleEdge {

  96.     DQSINGLE_BEDGE_LEFT,

  97.     DQSINGLE_BEDGE_TOP,

  98.     DQSINGLE_BEDGE_RIGHT,

  99.     DQSINGLE_BEDGE_BOTTOM

  100. };

  101. //@}

  102. 

  103. /** Which pair of edges is quantized with ALTPQUANT */

  104. //@{

  105. enum DQDoubleEdge {

  106.     DQDOUBLE_BEDGE_TOPLEFT,

  107.     DQDOUBLE_BEDGE_TOPRIGHT,

  108.     DQDOUBLE_BEDGE_BOTTOMRIGHT,

  109.     DQDOUBLE_BEDGE_BOTTOMLEFT

  110. };

  111. //@}

  112. 

  113. /** MV modes for P frames */

  114. //@{

  115. enum MVModes {

  116.     MV_PMODE_1MV_HPEL_BILIN,

  117.     MV_PMODE_1MV,

  118.     MV_PMODE_1MV_HPEL,

  119.     MV_PMODE_MIXED_MV,

  120.     MV_PMODE_INTENSITY_COMP

  121. };

  122. //@}

  123. 

  124. /** @name MV types for B frames */

  125. //@{

  126. enum BMVTypes {

  127.     BMV_TYPE_BACKWARD,

  128.     BMV_TYPE_FORWARD,

  129.     BMV_TYPE_INTERPOLATED

  130. };

  131. //@}

  132. 

  133. /** @name Block types for P/B frames */

  134. //@{

  135. enum TransformTypes {

  136.     TT_8X8,

  137.     TT_8X4_BOTTOM,

  138.     TT_8X4_TOP,

  139.     TT_8X4, //Both halves

  140.     TT_4X8_RIGHT,

  141.     TT_4X8_LEFT,

  142.     TT_4X8, //Both halves

  143.     TT_4X4

  144. };

  145. //@}

  146. 

  147. /** Table for conversion between TTBLK and TTMB */

  148. static const int ttblk_to_tt[3][8] = {

  149.   { TT_8X4, TT_4X8, TT_8X8, TT_4X4, TT_8X4_TOP, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT },

  150.   { TT_8X8, TT_4X8_RIGHT, TT_4X8_LEFT, TT_4X4, TT_8X4, TT_4X8, TT_8X4_BOTTOM, TT_8X4_TOP },

  151.   { TT_8X8, TT_4X8, TT_4X4, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT, TT_8X4, TT_8X4_TOP }

  152. };

  153. 

  154. static const int ttfrm_to_tt[4] = { TT_8X8, TT_8X4, TT_4X8, TT_4X4 };

  155. 

  156. /** MV P mode - the 5th element is only used for mode 1 */

  157. static const uint8_t mv_pmode_table[2][5] = {

  158.   { MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_MIXED_MV },

  159.   { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_1MV_HPEL_BILIN }

  160. };

  161. static const uint8_t mv_pmode_table2[2][4] = {

  162.   { MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_MIXED_MV },

  163.   { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN }

  164. };

  165. 

  166. /** One more frame type */

  167. #define BI_TYPE 7

  168. 

  169. static const int fps_nr[5] = { 24, 25, 30, 50, 60 },

  170.   fps_dr[2] = { 1000, 1001 };

  171. static const uint8_t pquant_table[3][32] = {

  172.   {  /* Implicit quantizer */

  173.      0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,

  174.     13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31

  175.   },

  176.   {  /* Explicit quantizer, pquantizer uniform */

  177.      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  178.     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

  179.   },

  180.   {  /* Explicit quantizer, pquantizer non-uniform */

  181.      0,  1,  1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,

  182.     14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31

  183.   }

  184. };

  185. 

  186. /** @name VC-1 VLC tables and defines

  187.  *  @todo TODO move this into the context

  188.  */

  189. //@{

  190. #define VC1_BFRACTION_VLC_BITS 7

  191. static VLC vc1_bfraction_vlc;

  192. #define VC1_IMODE_VLC_BITS 4

  193. static VLC vc1_imode_vlc;

  194. #define VC1_NORM2_VLC_BITS 3

  195. static VLC vc1_norm2_vlc;

  196. #define VC1_NORM6_VLC_BITS 9

  197. static VLC vc1_norm6_vlc;

  198. /* Could be optimized, one table only needs 8 bits */

  199. #define VC1_TTMB_VLC_BITS 9 //12

  200. static VLC vc1_ttmb_vlc[3];

  201. #define VC1_MV_DIFF_VLC_BITS 9 //15

  202. static VLC vc1_mv_diff_vlc[4];

  203. #define VC1_CBPCY_P_VLC_BITS 9 //14

  204. static VLC vc1_cbpcy_p_vlc[4];

  205. #define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6

  206. static VLC vc1_4mv_block_pattern_vlc[4];

  207. #define VC1_TTBLK_VLC_BITS 5

  208. static VLC vc1_ttblk_vlc[3];

  209. #define VC1_SUBBLKPAT_VLC_BITS 6

  210. static VLC vc1_subblkpat_vlc[3];

  211. 

  212. static VLC vc1_ac_coeff_table[8];

  213. //@}

  214. 

  215. enum CodingSet {

  216.     CS_HIGH_MOT_INTRA = 0,

  217.     CS_HIGH_MOT_INTER,

  218.     CS_LOW_MOT_INTRA,

  219.     CS_LOW_MOT_INTER,

  220.     CS_MID_RATE_INTRA,

  221.     CS_MID_RATE_INTER,

  222.     CS_HIGH_RATE_INTRA,

  223.     CS_HIGH_RATE_INTER

  224. };

  225. 

  226. /** @name Overlap conditions for Advanced Profile */

  227. //@{

  228. enum COTypes {

  229.     CONDOVER_NONE = 0,

  230.     CONDOVER_ALL,

  231.     CONDOVER_SELECT

  232. };

  233. //@}

  234. 

  235. 

  236. /** The VC1 Context

  237.  * @fixme Change size wherever another size is more efficient

  238.  * Many members are only used for Advanced Profile

  239.  */

  240. typedef struct VC1Context{

  241.     MpegEncContext s;

  242. 

  243.     int bits;

  244. 

  245.     /** Simple/Main Profile sequence header */

  246.     //@{

  247.     int res_sm;           ///< reserved, 2b

  248.     int res_x8;           ///< reserved

  249.     int multires;         ///< frame-level RESPIC syntax element present

  250.     int res_fasttx;       ///< reserved, always 1

  251.     int res_transtab;     ///< reserved, always 0

  252.     int rangered;         ///< RANGEREDFRM (range reduction) syntax element present

  253.                           ///< at frame level

  254.     int res_rtm_flag;     ///< reserved, set to 1

  255.     int reserved;         ///< reserved

  256.     //@}

  257. 

  258.     /** Advanced Profile */

  259.     //@{

  260.     int level;            ///< 3bits, for Advanced/Simple Profile, provided by TS layer

  261.     int chromaformat;     ///< 2bits, 2=4:2:0, only defined

  262.     int postprocflag;     ///< Per-frame processing suggestion flag present

  263.     int broadcast;        ///< TFF/RFF present

  264.     int interlace;        ///< Progressive/interlaced (RPTFTM syntax element)

  265.     int tfcntrflag;       ///< TFCNTR present

  266.     int panscanflag;      ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present

  267.     int extended_dmv;     ///< Additional extended dmv range at P/B frame-level

  268.     int color_prim;       ///< 8bits, chroma coordinates of the color primaries

  269.     int transfer_char;    ///< 8bits, Opto-electronic transfer characteristics

  270.     int matrix_coef;      ///< 8bits, Color primaries->YCbCr transform matrix

  271.     int hrd_param_flag;   ///< Presence of Hypothetical Reference

  272.                           ///< Decoder parameters

  273.     int psf;              ///< Progressive Segmented Frame

  274.     //@}

  275. 

  276.     /** Sequence header data for all Profiles

  277.      * TODO: choose between ints, uint8_ts and monobit flags

  278.      */

  279.     //@{

  280.     int profile;          ///< 2bits, Profile

  281.     int frmrtq_postproc;  ///< 3bits,

  282.     int bitrtq_postproc;  ///< 5bits, quantized framerate-based postprocessing strength

  283.     int fastuvmc;         ///< Rounding of qpel vector to hpel ? (not in Simple)

  284.     int extended_mv;      ///< Ext MV in P/B (not in Simple)

  285.     int dquant;           ///< How qscale varies with MBs, 2bits (not in Simple)

  286.     int vstransform;      ///< variable-size [48]x[48] transform type + info

  287.     int overlap;          ///< overlapped transforms in use

  288.     int quantizer_mode;   ///< 2bits, quantizer mode used for sequence, see QUANT_*

  289.     int finterpflag;      ///< INTERPFRM present

  290.     //@}

  291. 

  292.     /** Frame decoding info for all profiles */

  293.     //@{

  294.     uint8_t mv_mode;      ///< MV coding monde

  295.     uint8_t mv_mode2;     ///< Secondary MV coding mode (B frames)

  296.     int k_x;              ///< Number of bits for MVs (depends on MV range)

  297.     int k_y;              ///< Number of bits for MVs (depends on MV range)

  298.     int range_x, range_y; ///< MV range

  299.     uint8_t pq, altpq;    ///< Current/alternate frame quantizer scale

  300.     /** pquant parameters */

  301.     //@{

  302.     uint8_t dquantfrm;

  303.     uint8_t dqprofile;

  304.     uint8_t dqsbedge;

  305.     uint8_t dqbilevel;

  306.     //@}

  307.     /** AC coding set indexes

  308.      * @see 8.1.1.10, p(1)10

  309.      */

  310.     //@{

  311.     int c_ac_table_index; ///< Chroma index from ACFRM element

  312.     int y_ac_table_index; ///< Luma index from AC2FRM element

  313.     //@}

  314.     int ttfrm;            ///< Transform type info present at frame level

  315.     uint8_t ttmbf;        ///< Transform type flag

  316.     uint8_t ttblk4x4;     ///< Value of ttblk which indicates a 4x4 transform

  317.     int codingset;        ///< index of current table set from 11.8 to use for luma block decoding

  318.     int codingset2;       ///< index of current table set from 11.8 to use for chroma block decoding

  319.     int pqindex;          ///< raw pqindex used in coding set selection

  320.     int a_avail, c_avail;

  321.     uint8_t *mb_type_base, *mb_type[3];

  322. 

  323. 

  324.     /** Luma compensation parameters */

  325.     //@{

  326.     uint8_t lumscale;

  327.     uint8_t lumshift;

  328.     //@}

  329.     int16_t bfraction;    ///< Relative position % anchors=> how to scale MVs

  330.     uint8_t halfpq;       ///< Uniform quant over image and qp+.5

  331.     uint8_t respic;       ///< Frame-level flag for resized images

  332.     int buffer_fullness;  ///< HRD info

  333.     /** Ranges:

  334.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  335.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  336.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  337.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  338.      */

  339.     uint8_t mvrange;

  340.     uint8_t pquantizer;           ///< Uniform (over sequence) quantizer in use

  341.     VLC *cbpcy_vlc;               ///< CBPCY VLC table

  342.     int tt_index;                 ///< Index for Transform Type tables

  343.     uint8_t* mv_type_mb_plane;    ///< bitplane for mv_type == (4MV)

  344.     uint8_t* direct_mb_plane;     ///< bitplane for "direct" MBs

  345.     int mv_type_is_raw;           ///< mv type mb plane is not coded

  346.     int dmb_is_raw;               ///< direct mb plane is raw

  347.     int skip_is_raw;              ///< skip mb plane is not coded

  348.     uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation

  349.     int use_ic;                   ///< use intensity compensation in B-frames

  350.     int rnd;                      ///< rounding control

  351. 

  352.     /** Frame decoding info for S/M profiles only */

  353.     //@{

  354.     uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)

  355.     uint8_t interpfrm;

  356.     //@}

  357. 

  358.     /** Frame decoding info for Advanced profile */

  359.     //@{

  360.     uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace

  361.     uint8_t numpanscanwin;

  362.     uint8_t tfcntr;

  363.     uint8_t rptfrm, tff, rff;

  364.     uint16_t topleftx;

  365.     uint16_t toplefty;

  366.     uint16_t bottomrightx;

  367.     uint16_t bottomrighty;

  368.     uint8_t uvsamp;

  369.     uint8_t postproc;

  370.     int hrd_num_leaky_buckets;

  371.     uint8_t bit_rate_exponent;

  372.     uint8_t buffer_size_exponent;

  373.     uint8_t* acpred_plane;       ///< AC prediction flags bitplane

  374.     int acpred_is_raw;

  375.     uint8_t* over_flags_plane;   ///< Overflags bitplane

  376.     int overflg_is_raw;

  377.     uint8_t condover;

  378.     uint16_t *hrd_rate, *hrd_buffer;

  379.     uint8_t *hrd_fullness;

  380.     uint8_t range_mapy_flag;

  381.     uint8_t range_mapuv_flag;

  382.     uint8_t range_mapy;

  383.     uint8_t range_mapuv;

  384.     //@}

  385. 

  386.     int p_frame_skipped;

  387.     int bi_type;

  388. } VC1Context;

  389. 

  390. /**

  391.  * Get unary code of limited length

  392.  * @fixme FIXME Slow and ugly

  393.  * @param gb GetBitContext

  394.  * @param[in] stop The bitstop value (unary code of 1's or 0's)

  395.  * @param[in] len Maximum length

  396.  * @return Unary length/index

  397.  */

  398. static int get_prefix(GetBitContext *gb, int stop, int len)

  399. {

  400. #if 1

  401.     int i;

  402. 

  403.     for(i = 0; i < len && get_bits1(gb) != stop; i++);

  404.     return i;

  405. /*  int i = 0, tmp = !stop;

  406. 

  407.   while (i != len && tmp != stop)

  408.   {

  409.     tmp = get_bits(gb, 1);

  410.     i++;

  411.   }

  412.   if (i == len && tmp != stop) return len+1;

  413.   return i;*/

  414. #else

  415.   unsigned int buf;

  416.   int log;

  417. 

  418.   OPEN_READER(re, gb);

  419.   UPDATE_CACHE(re, gb);

  420.   buf=GET_CACHE(re, gb); //Still not sure

  421.   if (stop) buf = ~buf;

  422. 

  423.   log= av_log2(-buf); //FIXME: -?

  424.   if (log < limit){

  425.     LAST_SKIP_BITS(re, gb, log+1);

  426.     CLOSE_READER(re, gb);

  427.     return log;

  428.   }

  429. 

  430.   LAST_SKIP_BITS(re, gb, limit);

  431.   CLOSE_READER(re, gb);

  432.   return limit;

  433. #endif

  434. }

  435. 

  436. static inline int decode210(GetBitContext *gb){

  437.     int n;

  438.     n = get_bits1(gb);

  439.     if (n == 1)

  440.         return 0;

  441.     else

  442.         return 2 - get_bits1(gb);

  443. }

  444. 

  445. /**

  446.  * Init VC-1 specific tables and VC1Context members

  447.  * @param v The VC1Context to initialize

  448.  * @return Status

  449.  */

  450. static int vc1_init_common(VC1Context *v)

  451. {

  452.     static int done = 0;

  453.     int i = 0;

  454. 

  455.     v->hrd_rate = v->hrd_buffer = NULL;

  456. 

  457.     /* VLC tables */

  458.     if(!done)

  459.     {

  460.         done = 1;

  461.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  462.                  vc1_bfraction_bits, 1, 1,

  463.                  vc1_bfraction_codes, 1, 1, 1);

  464.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  465.                  vc1_norm2_bits, 1, 1,

  466.                  vc1_norm2_codes, 1, 1, 1);

  467.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  468.                  vc1_norm6_bits, 1, 1,

  469.                  vc1_norm6_codes, 2, 2, 1);

  470.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  471.                  vc1_imode_bits, 1, 1,

  472.                  vc1_imode_codes, 1, 1, 1);

  473.         for (i=0; i<3; i++)

  474.         {

  475.             init_vlc(&vc1_ttmb_vlc[i], VC1_TTMB_VLC_BITS, 16,

  476.                      vc1_ttmb_bits[i], 1, 1,

  477.                      vc1_ttmb_codes[i], 2, 2, 1);

  478.             init_vlc(&vc1_ttblk_vlc[i], VC1_TTBLK_VLC_BITS, 8,

  479.                      vc1_ttblk_bits[i], 1, 1,

  480.                      vc1_ttblk_codes[i], 1, 1, 1);

  481.             init_vlc(&vc1_subblkpat_vlc[i], VC1_SUBBLKPAT_VLC_BITS, 15,

  482.                      vc1_subblkpat_bits[i], 1, 1,

  483.                      vc1_subblkpat_codes[i], 1, 1, 1);

  484.         }

  485.         for(i=0; i<4; i++)

  486.         {

  487.             init_vlc(&vc1_4mv_block_pattern_vlc[i], VC1_4MV_BLOCK_PATTERN_VLC_BITS, 16,

  488.                      vc1_4mv_block_pattern_bits[i], 1, 1,

  489.                      vc1_4mv_block_pattern_codes[i], 1, 1, 1);

  490.             init_vlc(&vc1_cbpcy_p_vlc[i], VC1_CBPCY_P_VLC_BITS, 64,

  491.                      vc1_cbpcy_p_bits[i], 1, 1,

  492.                      vc1_cbpcy_p_codes[i], 2, 2, 1);

  493.             init_vlc(&vc1_mv_diff_vlc[i], VC1_MV_DIFF_VLC_BITS, 73,

  494.                      vc1_mv_diff_bits[i], 1, 1,

  495.                      vc1_mv_diff_codes[i], 2, 2, 1);

  496.         }

  497.         for(i=0; i<8; i++)

  498.             init_vlc(&vc1_ac_coeff_table[i], AC_VLC_BITS, vc1_ac_sizes[i],

  499.                      &vc1_ac_tables[i][0][1], 8, 4,

  500.                      &vc1_ac_tables[i][0][0], 8, 4, 1);

  501.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

  502.                  &ff_msmp4_mb_i_table[0][1], 4, 2,

  503.                  &ff_msmp4_mb_i_table[0][0], 4, 2, 1);

  504.     }

  505. 

  506.     /* Other defaults */

  507.     v->pq = -1;

  508.     v->mvrange = 0; /* 7.1.1.18, p80 */

  509. 

  510.     return 0;

  511. }

  512. 

  513. /***********************************************************************/

  514. /**

  515.  * @defgroup bitplane VC9 Bitplane decoding

  516.  * @see 8.7, p56

  517.  * @{

  518.  */

  519. 

  520. /** @addtogroup bitplane

  521.  * Imode types

  522.  * @{

  523.  */

  524. enum Imode {

  525.     IMODE_RAW,

  526.     IMODE_NORM2,

  527.     IMODE_DIFF2,

  528.     IMODE_NORM6,

  529.     IMODE_DIFF6,

  530.     IMODE_ROWSKIP,

  531.     IMODE_COLSKIP

  532. };

  533. /** @} */ //imode defines

  534. 

  535. /** Decode rows by checking if they are skipped

  536.  * @param plane Buffer to store decoded bits

  537.  * @param[in] width Width of this buffer

  538.  * @param[in] height Height of this buffer

  539.  * @param[in] stride of this buffer

  540.  */

  541. static void decode_rowskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){

  542.     int x, y;

  543. 

  544.     for (y=0; y<height; y++){

  545.         if (!get_bits(gb, 1)) //rowskip

  546.             memset(plane, 0, width);

  547.         else

  548.             for (x=0; x<width; x++)

  549.                 plane[x] = get_bits(gb, 1);

  550.         plane += stride;

  551.     }

  552. }

  553. 

  554. /** Decode columns by checking if they are skipped

  555.  * @param plane Buffer to store decoded bits

  556.  * @param[in] width Width of this buffer

  557.  * @param[in] height Height of this buffer

  558.  * @param[in] stride of this buffer

  559.  * @fixme FIXME: Optimize

  560.  */

  561. static void decode_colskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){

  562.     int x, y;

  563. 

  564.     for (x=0; x<width; x++){

  565.         if (!get_bits(gb, 1)) //colskip

  566.             for (y=0; y<height; y++)

  567.                 plane[y*stride] = 0;

  568.         else

  569.             for (y=0; y<height; y++)

  570.                 plane[y*stride] = get_bits(gb, 1);

  571.         plane ++;

  572.     }

  573. }

  574. 

  575. /** Decode a bitplane's bits

  576.  * @param bp Bitplane where to store the decode bits

  577.  * @param v VC-1 context for bit reading and logging

  578.  * @return Status

  579.  * @fixme FIXME: Optimize

  580.  */

  581. static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)

  582. {

  583.     GetBitContext *gb = &v->s.gb;

  584. 

  585.     int imode, x, y, code, offset;

  586.     uint8_t invert, *planep = data;

  587.     int width, height, stride;

  588. 

  589.     width = v->s.mb_width;

  590.     height = v->s.mb_height;

  591.     stride = v->s.mb_stride;

  592.     invert = get_bits(gb, 1);

  593.     imode = get_vlc2(gb, vc1_imode_vlc.table, VC1_IMODE_VLC_BITS, 1);

  594. 

  595.     *raw_flag = 0;

  596.     switch (imode)

  597.     {

  598.     case IMODE_RAW:

  599.         //Data is actually read in the MB layer (same for all tests == "raw")

  600.         *raw_flag = 1; //invert ignored

  601.         return invert;

  602.     case IMODE_DIFF2:

  603.     case IMODE_NORM2:

  604.         if ((height * width) & 1)

  605.         {

  606.             *planep++ = get_bits(gb, 1);

  607.             offset = 1;

  608.         }

  609.         else offset = 0;

  610.         // decode bitplane as one long line

  611.         for (y = offset; y < height * width; y += 2) {

  612.             code = get_vlc2(gb, vc1_norm2_vlc.table, VC1_NORM2_VLC_BITS, 1);

  613.             *planep++ = code & 1;

  614.             offset++;

  615.             if(offset == width) {

  616.                 offset = 0;

  617.                 planep += stride - width;

  618.             }

  619.             *planep++ = code >> 1;

  620.             offset++;

  621.             if(offset == width) {

  622.                 offset = 0;

  623.                 planep += stride - width;

  624.             }

  625.         }

  626.         break;

  627.     case IMODE_DIFF6:

  628.     case IMODE_NORM6:

  629.         if(!(height % 3) && (width % 3)) { // use 2x3 decoding

  630.             for(y = 0; y < height; y+= 3) {

  631.                 for(x = width & 1; x < width; x += 2) {

  632.                     code = get_vlc2(gb, vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  633.                     if(code < 0){

  634.                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");

  635.                         return -1;

  636.                     }

  637.                     planep[x + 0] = (code >> 0) & 1;

  638.                     planep[x + 1] = (code >> 1) & 1;

  639.                     planep[x + 0 + stride] = (code >> 2) & 1;

  640.                     planep[x + 1 + stride] = (code >> 3) & 1;

  641.                     planep[x + 0 + stride * 2] = (code >> 4) & 1;

  642.                     planep[x + 1 + stride * 2] = (code >> 5) & 1;

  643.                 }

  644.                 planep += stride * 3;

  645.             }

  646.             if(width & 1) decode_colskip(data, 1, height, stride, &v->s.gb);

  647.         } else { // 3x2

  648.             planep += (height & 1) * stride;

  649.             for(y = height & 1; y < height; y += 2) {

  650.                 for(x = width % 3; x < width; x += 3) {

  651.                     code = get_vlc2(gb, vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  652.                     if(code < 0){

  653.                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");

  654.                         return -1;

  655.                     }

  656.                     planep[x + 0] = (code >> 0) & 1;

  657.                     planep[x + 1] = (code >> 1) & 1;

  658.                     planep[x + 2] = (code >> 2) & 1;

  659.                     planep[x + 0 + stride] = (code >> 3) & 1;

  660.                     planep[x + 1 + stride] = (code >> 4) & 1;

  661.                     planep[x + 2 + stride] = (code >> 5) & 1;

  662.                 }

  663.                 planep += stride * 2;

  664.             }

  665.             x = width % 3;

  666.             if(x) decode_colskip(data  ,             x, height    , stride, &v->s.gb);

  667.             if(height & 1) decode_rowskip(data+x, width - x, 1, stride, &v->s.gb);

  668.         }

  669.         break;

  670.     case IMODE_ROWSKIP:

  671.         decode_rowskip(data, width, height, stride, &v->s.gb);

  672.         break;

  673.     case IMODE_COLSKIP:

  674.         decode_colskip(data, width, height, stride, &v->s.gb);

  675.         break;

  676.     default: break;

  677.     }

  678. 

  679.     /* Applying diff operator */

  680.     if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6)

  681.     {

  682.         planep = data;

  683.         planep[0] ^= invert;

  684.         for (x=1; x<width; x++)

  685.             planep[x] ^= planep[x-1];

  686.         for (y=1; y<height; y++)

  687.         {

  688.             planep += stride;

  689.             planep[0] ^= planep[-stride];

  690.             for (x=1; x<width; x++)

  691.             {

  692.                 if (planep[x-1] != planep[x-stride]) planep[x] ^= invert;

  693.                 else                                 planep[x] ^= planep[x-1];

  694.             }

  695.         }

  696.     }

  697.     else if (invert)

  698.     {

  699.         planep = data;

  700.         for (x=0; x<stride*height; x++) planep[x] = !planep[x]; //FIXME stride

  701.     }

  702.     return (imode<<1) + invert;

  703. }

  704. 

  705. /** @} */ //Bitplane group

  706. 

  707. /***********************************************************************/

  708. /** VOP Dquant decoding

  709.  * @param v VC-1 Context

  710.  */

  711. static int vop_dquant_decoding(VC1Context *v)

  712. {

  713.     GetBitContext *gb = &v->s.gb;

  714.     int pqdiff;

  715. 

  716.     //variable size

  717.     if (v->dquant == 2)

  718.     {

  719.         pqdiff = get_bits(gb, 3);

  720.         if (pqdiff == 7) v->altpq = get_bits(gb, 5);

  721.         else v->altpq = v->pq + pqdiff + 1;

  722.     }

  723.     else

  724.     {

  725.         v->dquantfrm = get_bits(gb, 1);

  726.         if ( v->dquantfrm )

  727.         {

  728.             v->dqprofile = get_bits(gb, 2);

  729.             switch (v->dqprofile)

  730.             {

  731.             case DQPROFILE_SINGLE_EDGE:

  732.             case DQPROFILE_DOUBLE_EDGES:

  733.                 v->dqsbedge = get_bits(gb, 2);

  734.                 break;

  735.             case DQPROFILE_ALL_MBS:

  736.                 v->dqbilevel = get_bits(gb, 1);

  737.             default: break; //Forbidden ?

  738.             }

  739.             if (v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS)

  740.             {

  741.                 pqdiff = get_bits(gb, 3);

  742.                 if (pqdiff == 7) v->altpq = get_bits(gb, 5);

  743.                 else v->altpq = v->pq + pqdiff + 1;

  744.             }

  745.         }

  746.     }

  747.     return 0;

  748. }

  749. 

  750. /** Put block onto picture

  751.  */

  752. static void vc1_put_block(VC1Context *v, DCTELEM block[6][64])

  753. {

  754.     uint8_t *Y;

  755.     int ys, us, vs;

  756.     DSPContext *dsp = &v->s.dsp;

  757. 

  758.     if(v->rangeredfrm) {

  759.         int i, j, k;

  760.         for(k = 0; k < 6; k++)

  761.             for(j = 0; j < 8; j++)

  762.                 for(i = 0; i < 8; i++)

  763.                     block[k][i + j*8] = ((block[k][i + j*8] - 128) << 1) + 128;

  764. 

  765.     }

  766.     ys = v->s.current_picture.linesize[0];

  767.     us = v->s.current_picture.linesize[1];

  768.     vs = v->s.current_picture.linesize[2];

  769.     Y = v->s.dest[0];

  770. 

  771.     dsp->put_pixels_clamped(block[0], Y, ys);

  772.     dsp->put_pixels_clamped(block[1], Y + 8, ys);

  773.     Y += ys * 8;

  774.     dsp->put_pixels_clamped(block[2], Y, ys);

  775.     dsp->put_pixels_clamped(block[3], Y + 8, ys);

  776. 

  777.     if(!(v->s.flags & CODEC_FLAG_GRAY)) {

  778.         dsp->put_pixels_clamped(block[4], v->s.dest[1], us);

  779.         dsp->put_pixels_clamped(block[5], v->s.dest[2], vs);

  780.     }

  781. }

  782. 

  783. /** Do motion compensation over 1 macroblock

  784.  * Mostly adapted hpel_motion and qpel_motion from mpegvideo.c

  785.  */

  786. static void vc1_mc_1mv(VC1Context *v, int dir)

  787. {

  788.     MpegEncContext *s = &v->s;

  789.     DSPContext *dsp = &v->s.dsp;

  790.     uint8_t *srcY, *srcU, *srcV;

  791.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  792. 

  793.     if(!v->s.last_picture.data[0])return;

  794. 

  795.     mx = s->mv[dir][0][0];

  796.     my = s->mv[dir][0][1];

  797. 

  798.     // store motion vectors for further use in B frames

  799.     if(s->pict_type == P_TYPE) {

  800.         s->current_picture.motion_val[1][s->block_index[0]][0] = mx;

  801.         s->current_picture.motion_val[1][s->block_index[0]][1] = my;

  802.     }

  803.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  804.     uvmy = (my + ((my & 3) == 3)) >> 1;

  805.     if(v->fastuvmc) {

  806.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  807.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  808.     }

  809.     if(!dir) {

  810.         srcY = s->last_picture.data[0];

  811.         srcU = s->last_picture.data[1];

  812.         srcV = s->last_picture.data[2];

  813.     } else {

  814.         srcY = s->next_picture.data[0];

  815.         srcU = s->next_picture.data[1];

  816.         srcV = s->next_picture.data[2];

  817.     }

  818. 

  819.     src_x = s->mb_x * 16 + (mx >> 2);

  820.     src_y = s->mb_y * 16 + (my >> 2);

  821.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  822.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  823. 

  824.     if(v->profile != PROFILE_ADVANCED){

  825.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  826.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  827.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  828.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  829.     }else{

  830.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  831.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  832.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  833.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  834.     }

  835. 

  836.     srcY += src_y * s->linesize + src_x;

  837.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  838.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  839. 

  840.     /* for grayscale we should not try to read from unknown area */

  841.     if(s->flags & CODEC_FLAG_GRAY) {

  842.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  843.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  844.     }

  845. 

  846.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  847.        || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel*3

  848.        || (unsigned)(src_y - s->mspel) > s->v_edge_pos - (my&3) - 16 - s->mspel*3){

  849.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  850. 

  851.         srcY -= s->mspel * (1 + s->linesize);

  852.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  853.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  854.         srcY = s->edge_emu_buffer;

  855.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  856.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  857.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  858.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  859.         srcU = uvbuf;

  860.         srcV = uvbuf + 16;

  861.         /* if we deal with range reduction we need to scale source blocks */

  862.         if(v->rangeredfrm) {

  863.             int i, j;

  864.             uint8_t *src, *src2;

  865. 

  866.             src = srcY;

  867.             for(j = 0; j < 17 + s->mspel*2; j++) {

  868.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  869.                 src += s->linesize;

  870.             }

  871.             src = srcU; src2 = srcV;

  872.             for(j = 0; j < 9; j++) {

  873.                 for(i = 0; i < 9; i++) {

  874.                     src[i] = ((src[i] - 128) >> 1) + 128;

  875.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  876.                 }

  877.                 src += s->uvlinesize;

  878.                 src2 += s->uvlinesize;

  879.             }

  880.         }

  881.         /* if we deal with intensity compensation we need to scale source blocks */

  882.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  883.             int i, j;

  884.             uint8_t *src, *src2;

  885. 

  886.             src = srcY;

  887.             for(j = 0; j < 17 + s->mspel*2; j++) {

  888.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = v->luty[src[i]];

  889.                 src += s->linesize;

  890.             }

  891.             src = srcU; src2 = srcV;

  892.             for(j = 0; j < 9; j++) {

  893.                 for(i = 0; i < 9; i++) {

  894.                     src[i] = v->lutuv[src[i]];

  895.                     src2[i] = v->lutuv[src2[i]];

  896.                 }

  897.                 src += s->uvlinesize;

  898.                 src2 += s->uvlinesize;

  899.             }

  900.         }

  901.         srcY += s->mspel * (1 + s->linesize);

  902.     }

  903. 

  904.     if(s->mspel) {

  905.         dxy = ((my & 3) << 2) | (mx & 3);

  906.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);

  907.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8, srcY + 8, s->linesize, v->rnd);

  908.         srcY += s->linesize * 8;

  909.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  910.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  911.     } else { // hpel mc - always used for luma

  912.         dxy = (my & 2) | ((mx & 2) >> 1);

  913. 

  914.         if(!v->rnd)

  915.             dsp->put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  916.         else

  917.             dsp->put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  918.     }

  919. 

  920.     if(s->flags & CODEC_FLAG_GRAY) return;

  921.     /* Chroma MC always uses qpel bilinear */

  922.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  923.     uvmx = (uvmx&3)<<1;

  924.     uvmy = (uvmy&3)<<1;

  925.     if(!v->rnd){

  926.         dsp->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  927.         dsp->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  928.     }else{

  929.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  930.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  931.     }

  932. }

  933. 

  934. /** Do motion compensation for 4-MV macroblock - luminance block

  935.  */

  936. static void vc1_mc_4mv_luma(VC1Context *v, int n)

  937. {

  938.     MpegEncContext *s = &v->s;

  939.     DSPContext *dsp = &v->s.dsp;

  940.     uint8_t *srcY;

  941.     int dxy, mx, my, src_x, src_y;

  942.     int off;

  943. 

  944.     if(!v->s.last_picture.data[0])return;

  945.     mx = s->mv[0][n][0];

  946.     my = s->mv[0][n][1];

  947.     srcY = s->last_picture.data[0];

  948. 

  949.     off = s->linesize * 4 * (n&2) + (n&1) * 8;

  950. 

  951.     src_x = s->mb_x * 16 + (n&1) * 8 + (mx >> 2);

  952.     src_y = s->mb_y * 16 + (n&2) * 4 + (my >> 2);

  953. 

  954.     if(v->profile != PROFILE_ADVANCED){

  955.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  956.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  957.     }else{

  958.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  959.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  960.     }

  961. 

  962.     srcY += src_y * s->linesize + src_x;

  963. 

  964.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  965.        || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 8 - s->mspel*2

  966.        || (unsigned)(src_y - s->mspel) > s->v_edge_pos - (my&3) - 8 - s->mspel*2){

  967.         srcY -= s->mspel * (1 + s->linesize);

  968.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 9+s->mspel*2, 9+s->mspel*2,

  969.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  970.         srcY = s->edge_emu_buffer;

  971.         /* if we deal with range reduction we need to scale source blocks */

  972.         if(v->rangeredfrm) {

  973.             int i, j;

  974.             uint8_t *src;

  975. 

  976.             src = srcY;

  977.             for(j = 0; j < 9 + s->mspel*2; j++) {

  978.                 for(i = 0; i < 9 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  979.                 src += s->linesize;

  980.             }

  981.         }

  982.         /* if we deal with intensity compensation we need to scale source blocks */

  983.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  984.             int i, j;

  985.             uint8_t *src;

  986. 

  987.             src = srcY;

  988.             for(j = 0; j < 9 + s->mspel*2; j++) {

  989.                 for(i = 0; i < 9 + s->mspel*2; i++) src[i] = v->luty[src[i]];

  990.                 src += s->linesize;

  991.             }

  992.         }

  993.         srcY += s->mspel * (1 + s->linesize);

  994.     }

  995. 

  996.     if(s->mspel) {

  997.         dxy = ((my & 3) << 2) | (mx & 3);

  998.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, v->rnd);

  999.     } else { // hpel mc - always used for luma

  1000.         dxy = (my & 2) | ((mx & 2) >> 1);

  1001.         if(!v->rnd)

  1002.             dsp->put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  1003.         else

  1004.             dsp->put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  1005.     }

  1006. }

  1007. 

  1008. static inline int median4(int a, int b, int c, int d)

  1009. {

  1010.     if(a < b) {

  1011.         if(c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;

  1012.         else      return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  1013.     } else {

  1014.         if(c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;

  1015.         else      return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  1016.     }

  1017. }

  1018. 

  1019. 

  1020. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1021.  */

  1022. static void vc1_mc_4mv_chroma(VC1Context *v)

  1023. {

  1024.     MpegEncContext *s = &v->s;

  1025.     DSPContext *dsp = &v->s.dsp;

  1026.     uint8_t *srcU, *srcV;

  1027.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1028.     int i, idx, tx = 0, ty = 0;

  1029.     int mvx[4], mvy[4], intra[4];

  1030.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1031. 

  1032.     if(!v->s.last_picture.data[0])return;

  1033.     if(s->flags & CODEC_FLAG_GRAY) return;

  1034. 

  1035.     for(i = 0; i < 4; i++) {

  1036.         mvx[i] = s->mv[0][i][0];

  1037.         mvy[i] = s->mv[0][i][1];

  1038.         intra[i] = v->mb_type[0][s->block_index[i]];

  1039.     }

  1040. 

  1041.     /* calculate chroma MV vector from four luma MVs */

  1042.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  1043.     if(!idx) { // all blocks are inter

  1044.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1045.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1046.     } else if(count[idx] == 1) { // 3 inter blocks

  1047.         switch(idx) {

  1048.         case 0x1:

  1049.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1050.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1051.             break;

  1052.         case 0x2:

  1053.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1054.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1055.             break;

  1056.         case 0x4:

  1057.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1058.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1059.             break;

  1060.         case 0x8:

  1061.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1062.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1063.             break;

  1064.         }

  1065.     } else if(count[idx] == 2) {

  1066.         int t1 = 0, t2 = 0;

  1067.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1068.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1069.         tx = (mvx[t1] + mvx[t2]) / 2;

  1070.         ty = (mvy[t1] + mvy[t2]) / 2;

  1071.     } else {

  1072.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1073.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1074.         return; //no need to do MC for inter blocks

  1075.     }

  1076. 

  1077.     s->current_picture.motion_val[1][s->block_index[0]][0] = tx;

  1078.     s->current_picture.motion_val[1][s->block_index[0]][1] = ty;

  1079.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1080.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1081.     if(v->fastuvmc) {

  1082.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1083.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1084.     }

  1085. 

  1086.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1087.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1088. 

  1089.     if(v->profile != PROFILE_ADVANCED){

  1090.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1091.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1092.     }else{

  1093.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1094.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1095.     }

  1096. 

  1097.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1098.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1099.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1100.        || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  1101.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){

  1102.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1103.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1104.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1105.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1106.         srcU = s->edge_emu_buffer;

  1107.         srcV = s->edge_emu_buffer + 16;

  1108. 

  1109.         /* if we deal with range reduction we need to scale source blocks */

  1110.         if(v->rangeredfrm) {

  1111.             int i, j;

  1112.             uint8_t *src, *src2;

  1113. 

  1114.             src = srcU; src2 = srcV;

  1115.             for(j = 0; j < 9; j++) {

  1116.                 for(i = 0; i < 9; i++) {

  1117.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1118.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1119.                 }

  1120.                 src += s->uvlinesize;

  1121.                 src2 += s->uvlinesize;

  1122.             }

  1123.         }

  1124.         /* if we deal with intensity compensation we need to scale source blocks */

  1125.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1126.             int i, j;

  1127.             uint8_t *src, *src2;

  1128. 

  1129.             src = srcU; src2 = srcV;

  1130.             for(j = 0; j < 9; j++) {

  1131.                 for(i = 0; i < 9; i++) {

  1132.                     src[i] = v->lutuv[src[i]];

  1133.                     src2[i] = v->lutuv[src2[i]];

  1134.                 }

  1135.                 src += s->uvlinesize;

  1136.                 src2 += s->uvlinesize;

  1137.             }

  1138.         }

  1139.     }

  1140. 

  1141.     /* Chroma MC always uses qpel bilinear */

  1142.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1143.     uvmx = (uvmx&3)<<1;

  1144.     uvmy = (uvmy&3)<<1;

  1145.     if(!v->rnd){

  1146.         dsp->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1147.         dsp->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1148.     }else{

  1149.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1150.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1151.     }

  1152. }

  1153. 

  1154. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);

  1155. 

  1156. /**

  1157.  * Decode Simple/Main Profiles sequence header

  1158.  * @see Figure 7-8, p16-17

  1159.  * @param avctx Codec context

  1160.  * @param gb GetBit context initialized from Codec context extra_data

  1161.  * @return Status

  1162.  */

  1163. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1164. {

  1165.     VC1Context *v = avctx->priv_data;

  1166. 

  1167.     av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));

  1168.     v->profile = get_bits(gb, 2);

  1169.     if (v->profile == PROFILE_COMPLEX)

  1170.     {

  1171.         av_log(avctx, AV_LOG_ERROR, "WMV3 Complex Profile is not fully supported\n");

  1172.     }

  1173. 

  1174.     if (v->profile == PROFILE_ADVANCED)

  1175.     {

  1176.         return decode_sequence_header_adv(v, gb);

  1177.     }

  1178.     else

  1179.     {

  1180.         v->res_sm = get_bits(gb, 2); //reserved

  1181.         if (v->res_sm)

  1182.         {

  1183.             av_log(avctx, AV_LOG_ERROR,

  1184.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1185.             return -1;

  1186.         }

  1187.     }

  1188. 

  1189.     // (fps-2)/4 (->30)

  1190.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1191.     // (bitrate-32kbps)/64kbps

  1192.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1193.     v->s.loop_filter = get_bits(gb, 1); //common

  1194.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1195.     {

  1196.         av_log(avctx, AV_LOG_ERROR,

  1197.                "LOOPFILTER shell not be enabled in simple profile\n");

  1198.     }

  1199. 

  1200.     v->res_x8 = get_bits(gb, 1); //reserved

  1201.     if (v->res_x8)

  1202.     {

  1203.         av_log(avctx, AV_LOG_ERROR,

  1204.                "1 for reserved RES_X8 is forbidden\n");

  1205.         //return -1;

  1206.     }

  1207.     v->multires = get_bits(gb, 1);

  1208.     v->res_fasttx = get_bits(gb, 1);

  1209.     if (!v->res_fasttx)

  1210.     {

  1211.         av_log(avctx, AV_LOG_ERROR,

  1212.                "0 for reserved RES_FASTTX is forbidden\n");

  1213.         //return -1;

  1214.     }

  1215. 

  1216.     v->fastuvmc =  get_bits(gb, 1); //common

  1217.     if (!v->profile && !v->fastuvmc)

  1218.     {

  1219.         av_log(avctx, AV_LOG_ERROR,

  1220.                "FASTUVMC unavailable in Simple Profile\n");

  1221.         return -1;

  1222.     }

  1223.     v->extended_mv =  get_bits(gb, 1); //common

  1224.     if (!v->profile && v->extended_mv)

  1225.     {

  1226.         av_log(avctx, AV_LOG_ERROR,

  1227.                "Extended MVs unavailable in Simple Profile\n");

  1228.         return -1;

  1229.     }

  1230.     v->dquant =  get_bits(gb, 2); //common

  1231.     v->vstransform =  get_bits(gb, 1); //common

  1232. 

  1233.     v->res_transtab = get_bits(gb, 1);

  1234.     if (v->res_transtab)

  1235.     {

  1236.         av_log(avctx, AV_LOG_ERROR,

  1237.                "1 for reserved RES_TRANSTAB is forbidden\n");

  1238.         return -1;

  1239.     }

  1240. 

  1241.     v->overlap = get_bits(gb, 1); //common

  1242. 

  1243.     v->s.resync_marker = get_bits(gb, 1);

  1244.     v->rangered = get_bits(gb, 1);

  1245.     if (v->rangered && v->profile == PROFILE_SIMPLE)

  1246.     {

  1247.         av_log(avctx, AV_LOG_INFO,

  1248.                "RANGERED should be set to 0 in simple profile\n");

  1249.     }

  1250. 

  1251.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1252.     v->quantizer_mode = get_bits(gb, 2); //common

  1253. 

  1254.     v->finterpflag = get_bits(gb, 1); //common

  1255.     v->res_rtm_flag = get_bits(gb, 1); //reserved

  1256.     if (!v->res_rtm_flag)

  1257.     {

  1258. //            av_log(avctx, AV_LOG_ERROR,

  1259. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  1260.         av_log(avctx, AV_LOG_ERROR,

  1261.                "Old WMV3 version detected, only I-frames will be decoded\n");

  1262.         //return -1;

  1263.     }

  1264.     //TODO: figure out what they mean (always 0x402F)

  1265.     if(!v->res_fasttx) skip_bits(gb, 16);

  1266.     av_log(avctx, AV_LOG_DEBUG,

  1267.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1268.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  1269.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1270.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1271.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1272.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1273.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1274.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1275.                );

  1276.     return 0;

  1277. }

  1278. 

  1279. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)

  1280. {

  1281.     v->res_rtm_flag = 1;

  1282.     v->level = get_bits(gb, 3);

  1283.     if(v->level >= 5)

  1284.     {

  1285.         av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1286.     }

  1287.     v->chromaformat = get_bits(gb, 2);

  1288.     if (v->chromaformat != 1)

  1289.     {

  1290.         av_log(v->s.avctx, AV_LOG_ERROR,

  1291.                "Only 4:2:0 chroma format supported\n");

  1292.         return -1;

  1293.     }

  1294. 

  1295.     // (fps-2)/4 (->30)

  1296.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1297.     // (bitrate-32kbps)/64kbps

  1298.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1299.     v->postprocflag = get_bits(gb, 1); //common

  1300. 

  1301.     v->s.avctx->coded_width = (get_bits(gb, 12) + 1) << 1;

  1302.     v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;

  1303.     v->s.avctx->width = v->s.avctx->coded_width;

  1304.     v->s.avctx->height = v->s.avctx->coded_height;

  1305.     v->broadcast = get_bits1(gb);

  1306.     v->interlace = get_bits1(gb);

  1307.     v->tfcntrflag = get_bits1(gb);

  1308.     v->finterpflag = get_bits1(gb);

  1309.     get_bits1(gb); // reserved

  1310. 

  1311.     v->s.h_edge_pos = v->s.avctx->coded_width;

  1312.     v->s.v_edge_pos = v->s.avctx->coded_height;

  1313. 

  1314.     av_log(v->s.avctx, AV_LOG_DEBUG,

  1315.                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1316.                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"

  1317.                "TFCTRflag=%i, FINTERPflag=%i\n",

  1318.                v->level, v->frmrtq_postproc, v->bitrtq_postproc,

  1319.                v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,

  1320.                v->tfcntrflag, v->finterpflag

  1321.                );

  1322. 

  1323.     v->psf = get_bits1(gb);

  1324.     if(v->psf) { //PsF, 6.1.13

  1325.         av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");

  1326.         return -1;

  1327.     }

  1328.     v->s.max_b_frames = v->s.avctx->max_b_frames = 7;

  1329.     if(get_bits1(gb)) { //Display Info - decoding is not affected by it

  1330.         int w, h, ar = 0;

  1331.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");

  1332.         v->s.avctx->width  = v->s.width  = w = get_bits(gb, 14) + 1;

  1333.         v->s.avctx->height = v->s.height = h = get_bits(gb, 14) + 1;

  1334.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);

  1335.         if(get_bits1(gb))

  1336.             ar = get_bits(gb, 4);

  1337.         if(ar && ar < 14){

  1338.             v->s.avctx->sample_aspect_ratio = vc1_pixel_aspect[ar];

  1339.         }else if(ar == 15){

  1340.             w = get_bits(gb, 8);

  1341.             h = get_bits(gb, 8);

  1342.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  1343.         }

  1344. 

  1345.         if(get_bits1(gb)){ //framerate stuff

  1346.             if(get_bits1(gb)) {

  1347.                 v->s.avctx->time_base.num = 32;

  1348.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1349.             } else {

  1350.                 int nr, dr;

  1351.                 nr = get_bits(gb, 8);

  1352.                 dr = get_bits(gb, 4);

  1353.                 if(nr && nr < 8 && dr && dr < 3){

  1354.                     v->s.avctx->time_base.num = fps_dr[dr - 1];

  1355.                     v->s.avctx->time_base.den = fps_nr[nr - 1] * 1000;

  1356.                 }

  1357.             }

  1358.         }

  1359. 

  1360.         if(get_bits1(gb)){

  1361.             v->color_prim = get_bits(gb, 8);

  1362.             v->transfer_char = get_bits(gb, 8);

  1363.             v->matrix_coef = get_bits(gb, 8);

  1364.         }

  1365.     }

  1366. 

  1367.     v->hrd_param_flag = get_bits1(gb);

  1368.     if(v->hrd_param_flag) {

  1369.         int i;

  1370.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1371.         get_bits(gb, 4); //bitrate exponent

  1372.         get_bits(gb, 4); //buffer size exponent

  1373.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1374.             get_bits(gb, 16); //hrd_rate[n]

  1375.             get_bits(gb, 16); //hrd_buffer[n]

  1376.         }

  1377.     }

  1378.     return 0;

  1379. }

  1380. 

  1381. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1382. {

  1383.     VC1Context *v = avctx->priv_data;

  1384.     int i, blink, clentry, refdist;

  1385. 

  1386.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1387.     blink = get_bits1(gb); // broken link

  1388.     clentry = get_bits1(gb); // closed entry

  1389.     v->panscanflag = get_bits1(gb);

  1390.     refdist = get_bits1(gb); // refdist flag

  1391.     v->s.loop_filter = get_bits1(gb);

  1392.     v->fastuvmc = get_bits1(gb);

  1393.     v->extended_mv = get_bits1(gb);

  1394.     v->dquant = get_bits(gb, 2);

  1395.     v->vstransform = get_bits1(gb);

  1396.     v->overlap = get_bits1(gb);

  1397.     v->quantizer_mode = get_bits(gb, 2);

  1398. 

  1399.     if(v->hrd_param_flag){

  1400.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1401.             get_bits(gb, 8); //hrd_full[n]

  1402.         }

  1403.     }

  1404. 

  1405.     if(get_bits1(gb)){

  1406.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1407.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1408.     }

  1409.     if(v->extended_mv)

  1410.         v->extended_dmv = get_bits1(gb);

  1411.     if(get_bits1(gb)) {

  1412.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1413.         skip_bits(gb, 3); // Y range, ignored for now

  1414.     }

  1415.     if(get_bits1(gb)) {

  1416.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1417.         skip_bits(gb, 3); // UV range, ignored for now

  1418.     }

  1419. 

  1420.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1421.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1422.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1423.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1424.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1425.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1426. 

  1427.     return 0;

  1428. }

  1429. 

  1430. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1431. {

  1432.     int pqindex, lowquant, status;

  1433. 

  1434.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1435.     skip_bits(gb, 2); //framecnt unused

  1436.     v->rangeredfrm = 0;

  1437.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1438.     v->s.pict_type = get_bits(gb, 1);

  1439.     if (v->s.avctx->max_b_frames) {

  1440.         if (!v->s.pict_type) {

  1441.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1442.             else v->s.pict_type = B_TYPE;

  1443.         } else v->s.pict_type = P_TYPE;

  1444.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1445. 

  1446.     v->bi_type = 0;

  1447.     if(v->s.pict_type == B_TYPE) {

  1448.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1449.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1450.         if(v->bfraction == 0) {

  1451.             v->s.pict_type = BI_TYPE;

  1452.         }

  1453.     }

  1454.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1455.         get_bits(gb, 7); // skip buffer fullness

  1456. 

  1457.     /* calculate RND */

  1458.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1459.         v->rnd = 1;

  1460.     if(v->s.pict_type == P_TYPE)

  1461.         v->rnd ^= 1;

  1462. 

  1463.     /* Quantizer stuff */

  1464.     pqindex = get_bits(gb, 5);

  1465.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1466.         v->pq = pquant_table[0][pqindex];

  1467.     else

  1468.         v->pq = pquant_table[1][pqindex];

  1469. 

  1470.     v->pquantizer = 1;

  1471.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1472.         v->pquantizer = pqindex < 9;

  1473.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1474.         v->pquantizer = 0;

  1475.     v->pqindex = pqindex;

  1476.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1477.     else v->halfpq = 0;

  1478.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1479.         v->pquantizer = get_bits(gb, 1);

  1480.     v->dquantfrm = 0;

  1481.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1482.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1483.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1484.     v->range_x = 1 << (v->k_x - 1);

  1485.     v->range_y = 1 << (v->k_y - 1);

  1486.     if (v->profile == PROFILE_ADVANCED)

  1487.     {

  1488.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1489.     }

  1490.     else

  1491.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1492. 

  1493.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1494.         if(get_bits1(gb))return -1;

  1495.     }

  1496. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1497. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1498. 

  1499.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1500. 

  1501.     switch(v->s.pict_type) {

  1502.     case P_TYPE:

  1503.         if (v->pq < 5) v->tt_index = 0;

  1504.         else if(v->pq < 13) v->tt_index = 1;

  1505.         else v->tt_index = 2;

  1506. 

  1507.         lowquant = (v->pq > 12) ? 0 : 1;

  1508.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1509.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1510.         {

  1511.             int scale, shift, i;

  1512.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1513.             v->lumscale = get_bits(gb, 6);

  1514.             v->lumshift = get_bits(gb, 6);

  1515.             v->use_ic = 1;

  1516.             /* fill lookup tables for intensity compensation */

  1517.             if(!v->lumscale) {

  1518.                 scale = -64;

  1519.                 shift = (255 - v->lumshift * 2) << 6;

  1520.                 if(v->lumshift > 31)

  1521.                     shift += 128 << 6;

  1522.             } else {

  1523.                 scale = v->lumscale + 32;

  1524.                 if(v->lumshift > 31)

  1525.                     shift = (v->lumshift - 64) << 6;

  1526.                 else

  1527.                     shift = v->lumshift << 6;

  1528.             }

  1529.             for(i = 0; i < 256; i++) {

  1530.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1531.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1532.             }

  1533.         }

  1534.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1535.             v->s.quarter_sample = 0;

  1536.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1537.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1538.                 v->s.quarter_sample = 0;

  1539.             else

  1540.                 v->s.quarter_sample = 1;

  1541.         } else

  1542.             v->s.quarter_sample = 1;

  1543.         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));

  1544. 

  1545.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1546.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1547.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1548.         {

  1549.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1550.             if (status < 0) return -1;

  1551.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1552.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1553.         } else {

  1554.             v->mv_type_is_raw = 0;

  1555.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1556.         }

  1557.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1558.         if (status < 0) return -1;

  1559.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1560.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1561. 

  1562.         /* Hopefully this is correct for P frames */

  1563.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1564.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1565. 

  1566.         if (v->dquant)

  1567.         {

  1568.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1569.             vop_dquant_decoding(v);

  1570.         }

  1571. 

  1572.         v->ttfrm = 0; //FIXME Is that so ?

  1573.         if (v->vstransform)

  1574.         {

  1575.             v->ttmbf = get_bits(gb, 1);

  1576.             if (v->ttmbf)

  1577.             {

  1578.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1579.             }

  1580.         } else {

  1581.             v->ttmbf = 1;

  1582.             v->ttfrm = TT_8X8;

  1583.         }

  1584.         break;

  1585.     case B_TYPE:

  1586.         if (v->pq < 5) v->tt_index = 0;

  1587.         else if(v->pq < 13) v->tt_index = 1;

  1588.         else v->tt_index = 2;

  1589. 

  1590.         lowquant = (v->pq > 12) ? 0 : 1;

  1591.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1592.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1593.         v->s.mspel = v->s.quarter_sample;

  1594. 

  1595.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1596.         if (status < 0) return -1;

  1597.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1598.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1599.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1600.         if (status < 0) return -1;

  1601.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1602.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1603. 

  1604.         v->s.mv_table_index = get_bits(gb, 2);

  1605.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1606. 

  1607.         if (v->dquant)

  1608.         {

  1609.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1610.             vop_dquant_decoding(v);

  1611.         }

  1612. 

  1613.         v->ttfrm = 0;

  1614.         if (v->vstransform)

  1615.         {

  1616.             v->ttmbf = get_bits(gb, 1);

  1617.             if (v->ttmbf)

  1618.             {

  1619.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1620.             }

  1621.         } else {

  1622.             v->ttmbf = 1;

  1623.             v->ttfrm = TT_8X8;

  1624.         }

  1625.         break;

  1626.     }

  1627. 

  1628.     /* AC Syntax */

  1629.     v->c_ac_table_index = decode012(gb);

  1630.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1631.     {

  1632.         v->y_ac_table_index = decode012(gb);

  1633.     }

  1634.     /* DC Syntax */

  1635.     v->s.dc_table_index = get_bits(gb, 1);

  1636. 

  1637.     if(v->s.pict_type == BI_TYPE) {

  1638.         v->s.pict_type = B_TYPE;

  1639.         v->bi_type = 1;

  1640.     }

  1641.     return 0;

  1642. }

  1643. 

  1644. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1645. {

  1646.     int pqindex, lowquant;

  1647.     int status;

  1648. 

  1649.     v->p_frame_skipped = 0;

  1650. 

  1651.     if(v->interlace){

  1652.         v->fcm = decode012(gb);

  1653.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1654.     }

  1655.     switch(get_prefix(gb, 0, 4)) {

  1656.     case 0:

  1657.         v->s.pict_type = P_TYPE;

  1658.         break;

  1659.     case 1:

  1660.         v->s.pict_type = B_TYPE;

  1661.         break;

  1662.     case 2:

  1663.         v->s.pict_type = I_TYPE;

  1664.         break;

  1665.     case 3:

  1666.         v->s.pict_type = BI_TYPE;

  1667.         break;

  1668.     case 4:

  1669.         v->s.pict_type = P_TYPE; // skipped pic

  1670.         v->p_frame_skipped = 1;

  1671.         return 0;

  1672.     }

  1673.     if(v->tfcntrflag)

  1674.         get_bits(gb, 8);

  1675.     if(v->broadcast) {

  1676.         if(!v->interlace || v->psf) {

  1677.             v->rptfrm = get_bits(gb, 2);

  1678.         } else {

  1679.             v->tff = get_bits1(gb);

  1680.             v->rptfrm = get_bits1(gb);

  1681.         }

  1682.     }

  1683.     if(v->panscanflag) {

  1684.         //...

  1685.     }

  1686.     v->rnd = get_bits1(gb);

  1687.     if(v->interlace)

  1688.         v->uvsamp = get_bits1(gb);

  1689.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1690.     if(v->s.pict_type == B_TYPE) {

  1691.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1692.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1693.         if(v->bfraction == 0) {

  1694.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1695.         }

  1696.     }

  1697.     pqindex = get_bits(gb, 5);

  1698.     v->pqindex = pqindex;

  1699.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1700.         v->pq = pquant_table[0][pqindex];

  1701.     else

  1702.         v->pq = pquant_table[1][pqindex];

  1703. 

  1704.     v->pquantizer = 1;

  1705.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1706.         v->pquantizer = pqindex < 9;

  1707.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1708.         v->pquantizer = 0;

  1709.     v->pqindex = pqindex;

  1710.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1711.     else v->halfpq = 0;

  1712.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1713.         v->pquantizer = get_bits(gb, 1);

  1714. 

  1715.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1716. 

  1717.     switch(v->s.pict_type) {

  1718.     case I_TYPE:

  1719.     case BI_TYPE:

  1720.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1721.         if (status < 0) return -1;

  1722.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1723.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1724.         v->condover = CONDOVER_NONE;

  1725.         if(v->overlap && v->pq <= 8) {

  1726.             v->condover = decode012(gb);

  1727.             if(v->condover == CONDOVER_SELECT) {

  1728.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1729.                 if (status < 0) return -1;

  1730.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1731.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1732.             }

  1733.         }

  1734.         break;

  1735.     case P_TYPE:

  1736.         if(v->postprocflag)

  1737.             v->postproc = get_bits1(gb);

  1738.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1739.         else v->mvrange = 0;

  1740.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1741.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1742.         v->range_x = 1 << (v->k_x - 1);

  1743.         v->range_y = 1 << (v->k_y - 1);

  1744. 

  1745.         if (v->pq < 5) v->tt_index = 0;

  1746.         else if(v->pq < 13) v->tt_index = 1;

  1747.         else v->tt_index = 2;

  1748. 

  1749.         lowquant = (v->pq > 12) ? 0 : 1;

  1750.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1751.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1752.         {

  1753.             int scale, shift, i;

  1754.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1755.             v->lumscale = get_bits(gb, 6);

  1756.             v->lumshift = get_bits(gb, 6);

  1757.             /* fill lookup tables for intensity compensation */

  1758.             if(!v->lumscale) {

  1759.                 scale = -64;

  1760.                 shift = (255 - v->lumshift * 2) << 6;

  1761.                 if(v->lumshift > 31)

  1762.                     shift += 128 << 6;

  1763.             } else {

  1764.                 scale = v->lumscale + 32;

  1765.                 if(v->lumshift > 31)

  1766.                     shift = (v->lumshift - 64) << 6;

  1767.                 else

  1768.                     shift = v->lumshift << 6;

  1769.             }

  1770.             for(i = 0; i < 256; i++) {

  1771.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1772.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1773.             }

  1774.             v->use_ic = 1;

  1775.         }

  1776.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1777.             v->s.quarter_sample = 0;

  1778.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1779.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1780.                 v->s.quarter_sample = 0;

  1781.             else

  1782.                 v->s.quarter_sample = 1;

  1783.         } else

  1784.             v->s.quarter_sample = 1;

  1785.         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));

  1786. 

  1787.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1788.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1789.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1790.         {

  1791.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1792.             if (status < 0) return -1;

  1793.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1794.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1795.         } else {

  1796.             v->mv_type_is_raw = 0;

  1797.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1798.         }

  1799.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1800.         if (status < 0) return -1;

  1801.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1802.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1803. 

  1804.         /* Hopefully this is correct for P frames */

  1805.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1806.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1807.         if (v->dquant)

  1808.         {

  1809.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1810.             vop_dquant_decoding(v);

  1811.         }

  1812. 

  1813.         v->ttfrm = 0; //FIXME Is that so ?

  1814.         if (v->vstransform)

  1815.         {

  1816.             v->ttmbf = get_bits(gb, 1);

  1817.             if (v->ttmbf)

  1818.             {

  1819.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1820.             }

  1821.         } else {

  1822.             v->ttmbf = 1;

  1823.             v->ttfrm = TT_8X8;

  1824.         }

  1825.         break;

  1826.     case B_TYPE:

  1827.         if(v->postprocflag)

  1828.             v->postproc = get_bits1(gb);

  1829.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1830.         else v->mvrange = 0;

  1831.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1832.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1833.         v->range_x = 1 << (v->k_x - 1);

  1834.         v->range_y = 1 << (v->k_y - 1);

  1835. 

  1836.         if (v->pq < 5) v->tt_index = 0;

  1837.         else if(v->pq < 13) v->tt_index = 1;

  1838.         else v->tt_index = 2;

  1839. 

  1840.         lowquant = (v->pq > 12) ? 0 : 1;

  1841.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1842.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1843.         v->s.mspel = v->s.quarter_sample;

  1844. 

  1845.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1846.         if (status < 0) return -1;

  1847.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1848.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1849.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1850.         if (status < 0) return -1;

  1851.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1852.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1853. 

  1854.         v->s.mv_table_index = get_bits(gb, 2);

  1855.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1856. 

  1857.         if (v->dquant)

  1858.         {

  1859.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1860.             vop_dquant_decoding(v);

  1861.         }

  1862. 

  1863.         v->ttfrm = 0;

  1864.         if (v->vstransform)

  1865.         {

  1866.             v->ttmbf = get_bits(gb, 1);

  1867.             if (v->ttmbf)

  1868.             {

  1869.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1870.             }

  1871.         } else {

  1872.             v->ttmbf = 1;

  1873.             v->ttfrm = TT_8X8;

  1874.         }

  1875.         break;

  1876.     }

  1877. 

  1878.     /* AC Syntax */

  1879.     v->c_ac_table_index = decode012(gb);

  1880.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1881.     {

  1882.         v->y_ac_table_index = decode012(gb);

  1883.     }

  1884.     /* DC Syntax */

  1885.     v->s.dc_table_index = get_bits(gb, 1);

  1886.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1887.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1888.         vop_dquant_decoding(v);

  1889.     }

  1890. 

  1891.     v->bi_type = 0;

  1892.     if(v->s.pict_type == BI_TYPE) {

  1893.         v->s.pict_type = B_TYPE;

  1894.         v->bi_type = 1;

  1895.     }

  1896.     return 0;

  1897. }

  1898. 

  1899. /***********************************************************************/

  1900. /**

  1901.  * @defgroup block VC-1 Block-level functions

  1902.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1903.  * @{

  1904.  */

  1905. 

  1906. /**

  1907.  * @def GET_MQUANT

  1908.  * @brief Get macroblock-level quantizer scale

  1909.  */

  1910. #define GET_MQUANT()                                           \

  1911.   if (v->dquantfrm)                                            \

  1912.   {                                                            \

  1913.     int edges = 0;                                             \

  1914.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1915.     {                                                          \

  1916.       if (v->dqbilevel)                                        \

  1917.       {                                                        \

  1918.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1919.       }                                                        \

  1920.       else                                                     \

  1921.       {                                                        \

  1922.         mqdiff = get_bits(gb, 3);                              \

  1923.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1924.         else mquant = get_bits(gb, 5);                         \

  1925.       }                                                        \

  1926.     }                                                          \

  1927.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1928.         edges = 1 << v->dqsbedge;                              \

  1929.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1930.         edges = (3 << v->dqsbedge) % 15;                       \

  1931.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1932.         edges = 15;                                            \

  1933.     if((edges&1) && !s->mb_x)                                  \

  1934.         mquant = v->altpq;                                     \

  1935.     if((edges&2) && s->first_slice_line)                       \

  1936.         mquant = v->altpq;                                     \

  1937.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1938.         mquant = v->altpq;                                     \

  1939.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1940.         mquant = v->altpq;                                     \

  1941.   }

  1942. 

  1943. /**

  1944.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1945.  * @brief Get MV differentials

  1946.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1947.  * @param _dmv_x Horizontal differential for decoded MV

  1948.  * @param _dmv_y Vertical differential for decoded MV

  1949.  */

  1950. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1951.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1952.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1953.   if (index > 36)                                                   \

  1954.   {                                                                 \

  1955.     mb_has_coeffs = 1;                                              \

  1956.     index -= 37;                                                    \

  1957.   }                                                                 \

  1958.   else mb_has_coeffs = 0;                                           \

  1959.   s->mb_intra = 0;                                                  \

  1960.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1961.   else if (index == 35)                                             \

  1962.   {                                                                 \

  1963.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1964.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1965.   }                                                                 \

  1966.   else if (index == 36)                                             \

  1967.   {                                                                 \

  1968.     _dmv_x = 0;                                                     \

  1969.     _dmv_y = 0;                                                     \

  1970.     s->mb_intra = 1;                                                \

  1971.   }                                                                 \

  1972.   else                                                              \

  1973.   {                                                                 \

  1974.     index1 = index%6;                                               \

  1975.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1976.     else                                   val = 0;                 \

  1977.     if(size_table[index1] - val > 0)                                \

  1978.         val = get_bits(gb, size_table[index1] - val);               \

  1979.     else                                   val = 0;                 \

  1980.     sign = 0 - (val&1);                                             \

  1981.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1982.                                                                     \

  1983.     index1 = index/6;                                               \

  1984.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1985.     else                                   val = 0;                 \

  1986.     if(size_table[index1] - val > 0)                                \

  1987.         val = get_bits(gb, size_table[index1] - val);               \

  1988.     else                                   val = 0;                 \

  1989.     sign = 0 - (val&1);                                             \

  1990.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1991.   }

  1992. 

  1993. /** Predict and set motion vector

  1994.  */

  1995. static inline void vc1_pred_mv(MpegEncContext *s, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t* is_intra)

  1996. {

  1997.     int xy, wrap, off = 0;

  1998.     int16_t *A, *B, *C;

  1999.     int px, py;

  2000.     int sum;

  2001. 

  2002.     /* scale MV difference to be quad-pel */

  2003.     dmv_x <<= 1 - s->quarter_sample;

  2004.     dmv_y <<= 1 - s->quarter_sample;

  2005. 

  2006.     wrap = s->b8_stride;

  2007.     xy = s->block_index[n];

  2008. 

  2009.     if(s->mb_intra){

  2010.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  2011.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  2012.         s->current_picture.motion_val[1][xy][0] = 0;

  2013.         s->current_picture.motion_val[1][xy][1] = 0;

  2014.         if(mv1) { /* duplicate motion data for 1-MV block */

  2015.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  2016.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  2017.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  2018.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  2019.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  2020.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  2021.             s->current_picture.motion_val[1][xy + 1][0] = 0;

  2022.             s->current_picture.motion_val[1][xy + 1][1] = 0;

  2023.             s->current_picture.motion_val[1][xy + wrap][0] = 0;

  2024.             s->current_picture.motion_val[1][xy + wrap][1] = 0;

  2025.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  2026.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  2027.         }

  2028.         return;

  2029.     }

  2030. 

  2031.     C = s->current_picture.motion_val[0][xy - 1];

  2032.     A = s->current_picture.motion_val[0][xy - wrap];

  2033.     if(mv1)

  2034.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  2035.     else {

  2036.         //in 4-MV mode different blocks have different B predictor position

  2037.         switch(n){

  2038.         case 0:

  2039.             off = (s->mb_x > 0) ? -1 : 1;

  2040.             break;

  2041.         case 1:

  2042.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  2043.             break;

  2044.         case 2:

  2045.             off = 1;

  2046.             break;

  2047.         case 3:

  2048.             off = -1;

  2049.         }

  2050.     }

  2051.     B = s->current_picture.motion_val[0][xy - wrap + off];

  2052. 

  2053.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  2054.         if(s->mb_width == 1) {

  2055.             px = A[0];

  2056.             py = A[1];

  2057.         } else {

  2058.             px = mid_pred(A[0], B[0], C[0]);

  2059.             py = mid_pred(A[1], B[1], C[1]);

  2060.         }

  2061.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  2062.         px = C[0];

  2063.         py = C[1];

  2064.     } else {

  2065.         px = py = 0;

  2066.     }

  2067.     /* Pullback MV as specified in 8.3.5.3.4 */

  2068.     {

  2069.         int qx, qy, X, Y;

  2070.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  2071.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  2072.         X = (s->mb_width << 6) - 4;

  2073.         Y = (s->mb_height << 6) - 4;

  2074.         if(mv1) {

  2075.             if(qx + px < -60) px = -60 - qx;

  2076.             if(qy + py < -60) py = -60 - qy;

  2077.         } else {

  2078.             if(qx + px < -28) px = -28 - qx;

  2079.             if(qy + py < -28) py = -28 - qy;

  2080.         }

  2081.         if(qx + px > X) px = X - qx;

  2082.         if(qy + py > Y) py = Y - qy;

  2083.     }

  2084.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2085.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  2086.         if(is_intra[xy - wrap])

  2087.             sum = FFABS(px) + FFABS(py);

  2088.         else

  2089.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2090.         if(sum > 32) {

  2091.             if(get_bits1(&s->gb)) {

  2092.                 px = A[0];

  2093.                 py = A[1];

  2094.             } else {

  2095.                 px = C[0];

  2096.                 py = C[1];

  2097.             }

  2098.         } else {

  2099.             if(is_intra[xy - 1])

  2100.                 sum = FFABS(px) + FFABS(py);

  2101.             else

  2102.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2103.             if(sum > 32) {

  2104.                 if(get_bits1(&s->gb)) {

  2105.                     px = A[0];

  2106.                     py = A[1];

  2107.                 } else {

  2108.                     px = C[0];

  2109.                     py = C[1];

  2110.                 }

  2111.             }

  2112.         }

  2113.     }

  2114.     /* store MV using signed modulus of MV range defined in 4.11 */

  2115.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  2116.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  2117.     if(mv1) { /* duplicate motion data for 1-MV block */

  2118.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  2119.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  2120.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  2121.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  2122.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  2123.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  2124.     }

  2125. }

  2126. 

  2127. /** Motion compensation for direct or interpolated blocks in B-frames

  2128.  */

  2129. static void vc1_interp_mc(VC1Context *v)

  2130. {

  2131.     MpegEncContext *s = &v->s;

  2132.     DSPContext *dsp = &v->s.dsp;

  2133.     uint8_t *srcY, *srcU, *srcV;

  2134.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  2135. 

  2136.     if(!v->s.next_picture.data[0])return;

  2137. 

  2138.     mx = s->mv[1][0][0];

  2139.     my = s->mv[1][0][1];

  2140.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  2141.     uvmy = (my + ((my & 3) == 3)) >> 1;

  2142.     if(v->fastuvmc) {

  2143.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  2144.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  2145.     }

  2146.     srcY = s->next_picture.data[0];

  2147.     srcU = s->next_picture.data[1];

  2148.     srcV = s->next_picture.data[2];

  2149. 

  2150.     src_x = s->mb_x * 16 + (mx >> 2);

  2151.     src_y = s->mb_y * 16 + (my >> 2);

  2152.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  2153.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  2154. 

  2155.     if(v->profile != PROFILE_ADVANCED){

  2156.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  2157.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  2158.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  2159.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  2160.     }else{

  2161.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  2162.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  2163.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  2164.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  2165.     }

  2166. 

  2167.     srcY += src_y * s->linesize + src_x;

  2168.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  2169.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  2170. 

  2171.     /* for grayscale we should not try to read from unknown area */

  2172.     if(s->flags & CODEC_FLAG_GRAY) {

  2173.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  2174.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  2175.     }

  2176. 

  2177.     if(v->rangeredfrm

  2178.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  2179.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  2180.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  2181. 

  2182.         srcY -= s->mspel * (1 + s->linesize);

  2183.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  2184.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  2185.         srcY = s->edge_emu_buffer;

  2186.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  2187.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2188.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  2189.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2190.         srcU = uvbuf;

  2191.         srcV = uvbuf + 16;

  2192.         /* if we deal with range reduction we need to scale source blocks */

  2193.         if(v->rangeredfrm) {

  2194.             int i, j;

  2195.             uint8_t *src, *src2;

  2196. 

  2197.             src = srcY;

  2198.             for(j = 0; j < 17 + s->mspel*2; j++) {

  2199.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  2200.                 src += s->linesize;

  2201.             }

  2202.             src = srcU; src2 = srcV;

  2203.             for(j = 0; j < 9; j++) {

  2204.                 for(i = 0; i < 9; i++) {

  2205.                     src[i] = ((src[i] - 128) >> 1) + 128;

  2206.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  2207.                 }

  2208.                 src += s->uvlinesize;

  2209.                 src2 += s->uvlinesize;

  2210.             }

  2211.         }

  2212.         srcY += s->mspel * (1 + s->linesize);

  2213.     }

  2214. 

  2215.     mx >>= 1;

  2216.     my >>= 1;

  2217.     dxy = ((my & 1) << 1) | (mx & 1);

  2218. 

  2219.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  2220. 

  2221.     if(s->flags & CODEC_FLAG_GRAY) return;

  2222.     /* Chroma MC always uses qpel blilinear */

  2223.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  2224.     uvmx = (uvmx&3)<<1;

  2225.     uvmy = (uvmy&3)<<1;

  2226.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  2227.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  2228. }

  2229. 

  2230. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  2231. {

  2232.     int n = bfrac;

  2233. 

  2234. #if B_FRACTION_DEN==256

  2235.     if(inv)

  2236.         n -= 256;

  2237.     if(!qs)

  2238.         return 2 * ((value * n + 255) >> 9);

  2239.     return (value * n + 128) >> 8;

  2240. #else

  2241.     if(inv)

  2242.         n -= B_FRACTION_DEN;

  2243.     if(!qs)

  2244.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2245.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2246. #endif

  2247. }

  2248. 

  2249. /** Reconstruct motion vector for B-frame and do motion compensation

  2250.  */

  2251. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  2252. {

  2253.     if(v->use_ic) {

  2254.         v->mv_mode2 = v->mv_mode;

  2255.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  2256.     }

  2257.     if(direct) {

  2258.         vc1_mc_1mv(v, 0);

  2259.         vc1_interp_mc(v);

  2260.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2261.         return;

  2262.     }

  2263.     if(mode == BMV_TYPE_INTERPOLATED) {

  2264.         vc1_mc_1mv(v, 0);

  2265.         vc1_interp_mc(v);

  2266.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2267.         return;

  2268.     }

  2269. 

  2270.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  2271.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2272.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  2273. }

  2274. 

  2275. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  2276. {

  2277.     MpegEncContext *s = &v->s;

  2278.     int xy, wrap, off = 0;

  2279.     int16_t *A, *B, *C;

  2280.     int px, py;

  2281.     int sum;

  2282.     int r_x, r_y;

  2283.     const uint8_t *is_intra = v->mb_type[0];

  2284. 

  2285.     r_x = v->range_x;

  2286.     r_y = v->range_y;

  2287.     /* scale MV difference to be quad-pel */

  2288.     dmv_x[0] <<= 1 - s->quarter_sample;

  2289.     dmv_y[0] <<= 1 - s->quarter_sample;

  2290.     dmv_x[1] <<= 1 - s->quarter_sample;

  2291.     dmv_y[1] <<= 1 - s->quarter_sample;

  2292. 

  2293.     wrap = s->b8_stride;

  2294.     xy = s->block_index[0];

  2295. 

  2296.     if(s->mb_intra) {

  2297.         s->current_picture.motion_val[0][xy][0] =

  2298.         s->current_picture.motion_val[0][xy][1] =

  2299.         s->current_picture.motion_val[1][xy][0] =

  2300.         s->current_picture.motion_val[1][xy][1] = 0;

  2301.         return;

  2302.     }

  2303.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2304.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2305.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2306.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2307. 

  2308.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2309.     s->mv[0][0][0] = av_clip(s->mv[0][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));

  2310.     s->mv[0][0][1] = av_clip(s->mv[0][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));

  2311.     s->mv[1][0][0] = av_clip(s->mv[1][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));

  2312.     s->mv[1][0][1] = av_clip(s->mv[1][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));

  2313.     if(direct) {

  2314.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2315.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2316.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2317.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2318.         return;

  2319.     }

  2320. 

  2321.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2322.         C = s->current_picture.motion_val[0][xy - 2];

  2323.         A = s->current_picture.motion_val[0][xy - wrap*2];

  2324.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2325.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  2326. 

  2327.         if(!s->mb_x) C[0] = C[1] = 0;

  2328.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2329.             if(s->mb_width == 1) {

  2330.                 px = A[0];

  2331.                 py = A[1];

  2332.             } else {

  2333.                 px = mid_pred(A[0], B[0], C[0]);

  2334.                 py = mid_pred(A[1], B[1], C[1]);

  2335.             }

  2336.         } else if(s->mb_x) { // predictor C is not out of bounds

  2337.             px = C[0];

  2338.             py = C[1];

  2339.         } else {

  2340.             px = py = 0;

  2341.         }

  2342.         /* Pullback MV as specified in 8.3.5.3.4 */

  2343.         {

  2344.             int qx, qy, X, Y;

  2345.             if(v->profile < PROFILE_ADVANCED) {

  2346.                 qx = (s->mb_x << 5);

  2347.                 qy = (s->mb_y << 5);

  2348.                 X = (s->mb_width << 5) - 4;

  2349.                 Y = (s->mb_height << 5) - 4;

  2350.                 if(qx + px < -28) px = -28 - qx;

  2351.                 if(qy + py < -28) py = -28 - qy;

  2352.                 if(qx + px > X) px = X - qx;

  2353.                 if(qy + py > Y) py = Y - qy;

  2354.             } else {

  2355.                 qx = (s->mb_x << 6);

  2356.                 qy = (s->mb_y << 6);

  2357.                 X = (s->mb_width << 6) - 4;

  2358.                 Y = (s->mb_height << 6) - 4;

  2359.                 if(qx + px < -60) px = -60 - qx;

  2360.                 if(qy + py < -60) py = -60 - qy;

  2361.                 if(qx + px > X) px = X - qx;

  2362.                 if(qy + py > Y) py = Y - qy;

  2363.             }

  2364.         }

  2365.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2366.         if(0 && !s->first_slice_line && s->mb_x) {

  2367.             if(is_intra[xy - wrap])

  2368.                 sum = FFABS(px) + FFABS(py);

  2369.             else

  2370.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2371.             if(sum > 32) {

  2372.                 if(get_bits1(&s->gb)) {

  2373.                     px = A[0];

  2374.                     py = A[1];

  2375.                 } else {

  2376.                     px = C[0];

  2377.                     py = C[1];

  2378.                 }

  2379.             } else {

  2380.                 if(is_intra[xy - 2])

  2381.                     sum = FFABS(px) + FFABS(py);

  2382.                 else

  2383.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2384.                 if(sum > 32) {

  2385.                     if(get_bits1(&s->gb)) {

  2386.                         px = A[0];

  2387.                         py = A[1];

  2388.                     } else {

  2389.                         px = C[0];

  2390.                         py = C[1];

  2391.                     }

  2392.                 }

  2393.             }

  2394.         }

  2395.         /* store MV using signed modulus of MV range defined in 4.11 */

  2396.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2397.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2398.     }

  2399.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2400.         C = s->current_picture.motion_val[1][xy - 2];

  2401.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2402.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2403.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2404. 

  2405.         if(!s->mb_x) C[0] = C[1] = 0;

  2406.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2407.             if(s->mb_width == 1) {

  2408.                 px = A[0];

  2409.                 py = A[1];

  2410.             } else {

  2411.                 px = mid_pred(A[0], B[0], C[0]);

  2412.                 py = mid_pred(A[1], B[1], C[1]);

  2413.             }

  2414.         } else if(s->mb_x) { // predictor C is not out of bounds

  2415.             px = C[0];

  2416.             py = C[1];

  2417.         } else {

  2418.             px = py = 0;

  2419.         }

  2420.         /* Pullback MV as specified in 8.3.5.3.4 */

  2421.         {

  2422.             int qx, qy, X, Y;

  2423.             if(v->profile < PROFILE_ADVANCED) {

  2424.                 qx = (s->mb_x << 5);

  2425.                 qy = (s->mb_y << 5);

  2426.                 X = (s->mb_width << 5) - 4;

  2427.                 Y = (s->mb_height << 5) - 4;

  2428.                 if(qx + px < -28) px = -28 - qx;

  2429.                 if(qy + py < -28) py = -28 - qy;

  2430.                 if(qx + px > X) px = X - qx;

  2431.                 if(qy + py > Y) py = Y - qy;

  2432.             } else {

  2433.                 qx = (s->mb_x << 6);

  2434.                 qy = (s->mb_y << 6);

  2435.                 X = (s->mb_width << 6) - 4;

  2436.                 Y = (s->mb_height << 6) - 4;

  2437.                 if(qx + px < -60) px = -60 - qx;

  2438.                 if(qy + py < -60) py = -60 - qy;

  2439.                 if(qx + px > X) px = X - qx;

  2440.                 if(qy + py > Y) py = Y - qy;

  2441.             }

  2442.         }

  2443.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2444.         if(0 && !s->first_slice_line && s->mb_x) {

  2445.             if(is_intra[xy - wrap])

  2446.                 sum = FFABS(px) + FFABS(py);

  2447.             else

  2448.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2449.             if(sum > 32) {

  2450.                 if(get_bits1(&s->gb)) {

  2451.                     px = A[0];

  2452.                     py = A[1];

  2453.                 } else {

  2454.                     px = C[0];

  2455.                     py = C[1];

  2456.                 }

  2457.             } else {

  2458.                 if(is_intra[xy - 2])

  2459.                     sum = FFABS(px) + FFABS(py);

  2460.                 else

  2461.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2462.                 if(sum > 32) {

  2463.                     if(get_bits1(&s->gb)) {

  2464.                         px = A[0];

  2465.                         py = A[1];

  2466.                     } else {

  2467.                         px = C[0];

  2468.                         py = C[1];

  2469.                     }

  2470.                 }

  2471.             }

  2472.         }

  2473.         /* store MV using signed modulus of MV range defined in 4.11 */

  2474. 

  2475.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2476.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2477.     }

  2478.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2479.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2480.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2481.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2482. }

  2483. 

  2484. /** Get predicted DC value for I-frames only

  2485.  * prediction dir: left=0, top=1

  2486.  * @param s MpegEncContext

  2487.  * @param[in] n block index in the current MB

  2488.  * @param dc_val_ptr Pointer to DC predictor

  2489.  * @param dir_ptr Prediction direction for use in AC prediction

  2490.  */

  2491. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2492.                               int16_t **dc_val_ptr, int *dir_ptr)

  2493. {

  2494.     int a, b, c, wrap, pred, scale;

  2495.     int16_t *dc_val;

  2496.     static const uint16_t dcpred[32] = {

  2497.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2498.          114,  102,   93,   85,   79,   73,   68,   64,

  2499.           60,   57,   54,   51,   49,   47,   45,   43,

  2500.           41,   39,   38,   37,   35,   34,   33

  2501.     };

  2502. 

  2503.     /* find prediction - wmv3_dc_scale always used here in fact */

  2504.     if (n < 4)     scale = s->y_dc_scale;

  2505.     else           scale = s->c_dc_scale;

  2506. 

  2507.     wrap = s->block_wrap[n];

  2508.     dc_val= s->dc_val[0] + s->block_index[n];

  2509. 

  2510.     /* B A

  2511.      * C X

  2512.      */

  2513.     c = dc_val[ - 1];

  2514.     b = dc_val[ - 1 - wrap];

  2515.     a = dc_val[ - wrap];

  2516. 

  2517.     if (pq < 9 || !overlap)

  2518.     {

  2519.         /* Set outer values */

  2520.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2521.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2522.     }

  2523.     else

  2524.     {

  2525.         /* Set outer values */

  2526.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2527.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2528.     }

  2529. 

  2530.     if (abs(a - b) <= abs(b - c)) {

  2531.         pred = c;

  2532.         *dir_ptr = 1;//left

  2533.     } else {

  2534.         pred = a;

  2535.         *dir_ptr = 0;//top

  2536.     }

  2537. 

  2538.     /* update predictor */

  2539.     *dc_val_ptr = &dc_val[0];

  2540.     return pred;

  2541. }

  2542. 

  2543. 

  2544. /** Get predicted DC value

  2545.  * prediction dir: left=0, top=1

  2546.  * @param s MpegEncContext

  2547.  * @param[in] n block index in the current MB

  2548.  * @param dc_val_ptr Pointer to DC predictor

  2549.  * @param dir_ptr Prediction direction for use in AC prediction

  2550.  */

  2551. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2552.                               int a_avail, int c_avail,

  2553.                               int16_t **dc_val_ptr, int *dir_ptr)

  2554. {

  2555.     int a, b, c, wrap, pred, scale;

  2556.     int16_t *dc_val;

  2557.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2558.     int q1, q2 = 0;

  2559. 

  2560.     /* find prediction - wmv3_dc_scale always used here in fact */

  2561.     if (n < 4)     scale = s->y_dc_scale;

  2562.     else           scale = s->c_dc_scale;

  2563. 

  2564.     wrap = s->block_wrap[n];

  2565.     dc_val= s->dc_val[0] + s->block_index[n];

  2566. 

  2567.     /* B A

  2568.      * C X

  2569.      */

  2570.     c = dc_val[ - 1];

  2571.     b = dc_val[ - 1 - wrap];

  2572.     a = dc_val[ - wrap];

  2573.     /* scale predictors if needed */

  2574.     q1 = s->current_picture.qscale_table[mb_pos];

  2575.     if(c_avail && (n!= 1 && n!=3)) {

  2576.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2577.         if(q2 && q2 != q1)

  2578.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2579.     }

  2580.     if(a_avail && (n!= 2 && n!=3)) {

  2581.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2582.         if(q2 && q2 != q1)

  2583.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2584.     }

  2585.     if(a_avail && c_avail && (n!=3)) {

  2586.         int off = mb_pos;

  2587.         if(n != 1) off--;

  2588.         if(n != 2) off -= s->mb_stride;

  2589.         q2 = s->current_picture.qscale_table[off];

  2590.         if(q2 && q2 != q1)

  2591.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2592.     }

  2593. 

  2594.     if(a_avail && c_avail) {

  2595.         if(abs(a - b) <= abs(b - c)) {

  2596.             pred = c;

  2597.             *dir_ptr = 1;//left

  2598.         } else {

  2599.             pred = a;

  2600.             *dir_ptr = 0;//top

  2601.         }

  2602.     } else if(a_avail) {

  2603.         pred = a;

  2604.         *dir_ptr = 0;//top

  2605.     } else if(c_avail) {

  2606.         pred = c;

  2607.         *dir_ptr = 1;//left

  2608.     } else {

  2609.         pred = 0;

  2610.         *dir_ptr = 1;//left

  2611.     }

  2612. 

  2613.     /* update predictor */

  2614.     *dc_val_ptr = &dc_val[0];

  2615.     return pred;

  2616. }

  2617. 

  2618. 

  2619. /**

  2620.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2621.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2622.  * @{

  2623.  */

  2624. 

  2625. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2626. {

  2627.     int xy, wrap, pred, a, b, c;

  2628. 

  2629.     xy = s->block_index[n];

  2630.     wrap = s->b8_stride;

  2631. 

  2632.     /* B C

  2633.      * A X

  2634.      */

  2635.     a = s->coded_block[xy - 1       ];

  2636.     b = s->coded_block[xy - 1 - wrap];

  2637.     c = s->coded_block[xy     - wrap];

  2638. 

  2639.     if (b == c) {

  2640.         pred = a;

  2641.     } else {

  2642.         pred = c;

  2643.     }

  2644. 

  2645.     /* store value */

  2646.     *coded_block_ptr = &s->coded_block[xy];

  2647. 

  2648.     return pred;

  2649. }

  2650. 

  2651. /**

  2652.  * Decode one AC coefficient

  2653.  * @param v The VC1 context

  2654.  * @param last Last coefficient

  2655.  * @param skip How much zero coefficients to skip

  2656.  * @param value Decoded AC coefficient value

  2657.  * @see 8.1.3.4

  2658.  */

  2659. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2660. {

  2661.     GetBitContext *gb = &v->s.gb;

  2662.     int index, escape, run = 0, level = 0, lst = 0;

  2663. 

  2664.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2665.     if (index != vc1_ac_sizes[codingset] - 1) {

  2666.         run = vc1_index_decode_table[codingset][index][0];

  2667.         level = vc1_index_decode_table[codingset][index][1];

  2668.         lst = index >= vc1_last_decode_table[codingset];

  2669.         if(get_bits(gb, 1))

  2670.             level = -level;

  2671.     } else {

  2672.         escape = decode210(gb);

  2673.         if (escape != 2) {

  2674.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2675.             run = vc1_index_decode_table[codingset][index][0];

  2676.             level = vc1_index_decode_table[codingset][index][1];

  2677.             lst = index >= vc1_last_decode_table[codingset];

  2678.             if(escape == 0) {

  2679.                 if(lst)

  2680.                     level += vc1_last_delta_level_table[codingset][run];

  2681.                 else

  2682.                     level += vc1_delta_level_table[codingset][run];

  2683.             } else {

  2684.                 if(lst)

  2685.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2686.                 else

  2687.                     run += vc1_delta_run_table[codingset][level] + 1;

  2688.             }

  2689.             if(get_bits(gb, 1))

  2690.                 level = -level;

  2691.         } else {

  2692.             int sign;

  2693.             lst = get_bits(gb, 1);

  2694.             if(v->s.esc3_level_length == 0) {

  2695.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2696.                     v->s.esc3_level_length = get_bits(gb, 3);

  2697.                     if(!v->s.esc3_level_length)

  2698.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2699.                 } else { //table 60

  2700.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2701.                 }

  2702.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2703.             }

  2704.             run = get_bits(gb, v->s.esc3_run_length);

  2705.             sign = get_bits(gb, 1);

  2706.             level = get_bits(gb, v->s.esc3_level_length);

  2707.             if(sign)

  2708.                 level = -level;

  2709.         }

  2710.     }

  2711. 

  2712.     *last = lst;

  2713.     *skip = run;

  2714.     *value = level;

  2715. }

  2716. 

  2717. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2718.  * @param v VC1Context

  2719.  * @param block block to decode

  2720.  * @param coded are AC coeffs present or not

  2721.  * @param codingset set of VLC to decode data

  2722.  */

  2723. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2724. {

  2725.     GetBitContext *gb = &v->s.gb;

  2726.     MpegEncContext *s = &v->s;

  2727.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2728.     int run_diff, i;

  2729.     int16_t *dc_val;

  2730.     int16_t *ac_val, *ac_val2;

  2731.     int dcdiff;

  2732. 

  2733.     /* Get DC differential */

  2734.     if (n < 4) {

  2735.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2736.     } else {

  2737.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2738.     }

  2739.     if (dcdiff < 0){

  2740.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2741.         return -1;

  2742.     }

  2743.     if (dcdiff)

  2744.     {

  2745.         if (dcdiff == 119 /* ESC index value */)

  2746.         {

  2747.             /* TODO: Optimize */

  2748.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2749.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2750.             else dcdiff = get_bits(gb, 8);

  2751.         }

  2752.         else

  2753.         {

  2754.             if (v->pq == 1)

  2755.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2756.             else if (v->pq == 2)

  2757.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2758.         }

  2759.         if (get_bits(gb, 1))

  2760.             dcdiff = -dcdiff;

  2761.     }

  2762. 

  2763.     /* Prediction */

  2764.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2765.     *dc_val = dcdiff;

  2766. 

  2767.     /* Store the quantized DC coeff, used for prediction */

  2768.     if (n < 4) {

  2769.         block[0] = dcdiff * s->y_dc_scale;

  2770.     } else {

  2771.         block[0] = dcdiff * s->c_dc_scale;

  2772.     }

  2773.     /* Skip ? */

  2774.     run_diff = 0;

  2775.     i = 0;

  2776.     if (!coded) {

  2777.         goto not_coded;

  2778.     }

  2779. 

  2780.     //AC Decoding

  2781.     i = 1;

  2782. 

  2783.     {

  2784.         int last = 0, skip, value;

  2785.         const int8_t *zz_table;

  2786.         int scale;

  2787.         int k;

  2788. 

  2789.         scale = v->pq * 2 + v->halfpq;

  2790. 

  2791.         if(v->s.ac_pred) {

  2792.             if(!dc_pred_dir)

  2793.                 zz_table = vc1_horizontal_zz;

  2794.             else

  2795.                 zz_table = vc1_vertical_zz;

  2796.         } else

  2797.             zz_table = vc1_normal_zz;

  2798. 

  2799.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2800.         ac_val2 = ac_val;

  2801.         if(dc_pred_dir) //left

  2802.             ac_val -= 16;

  2803.         else //top

  2804.             ac_val -= 16 * s->block_wrap[n];

  2805. 

  2806.         while (!last) {

  2807.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2808.             i += skip;

  2809.             if(i > 63)

  2810.                 break;

  2811.             block[zz_table[i++]] = value;

  2812.         }

  2813. 

  2814.         /* apply AC prediction if needed */

  2815.         if(s->ac_pred) {

  2816.             if(dc_pred_dir) { //left

  2817.                 for(k = 1; k < 8; k++)

  2818.                     block[k << 3] += ac_val[k];

  2819.             } else { //top

  2820.                 for(k = 1; k < 8; k++)

  2821.                     block[k] += ac_val[k + 8];

  2822.             }

  2823.         }

  2824.         /* save AC coeffs for further prediction */

  2825.         for(k = 1; k < 8; k++) {

  2826.             ac_val2[k] = block[k << 3];

  2827.             ac_val2[k + 8] = block[k];

  2828.         }

  2829. 

  2830.         /* scale AC coeffs */

  2831.         for(k = 1; k < 64; k++)

  2832.             if(block[k]) {

  2833.                 block[k] *= scale;

  2834.                 if(!v->pquantizer)

  2835.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2836.             }

  2837. 

  2838.         if(s->ac_pred) i = 63;

  2839.     }

  2840. 

  2841. not_coded:

  2842.     if(!coded) {

  2843.         int k, scale;

  2844.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2845.         ac_val2 = ac_val;

  2846. 

  2847.         scale = v->pq * 2 + v->halfpq;

  2848.         memset(ac_val2, 0, 16 * 2);

  2849.         if(dc_pred_dir) {//left

  2850.             ac_val -= 16;

  2851.             if(s->ac_pred)

  2852.                 memcpy(ac_val2, ac_val, 8 * 2);

  2853.         } else {//top

  2854.             ac_val -= 16 * s->block_wrap[n];

  2855.             if(s->ac_pred)

  2856.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2857.         }

  2858. 

  2859.         /* apply AC prediction if needed */

  2860.         if(s->ac_pred) {

  2861.             if(dc_pred_dir) { //left

  2862.                 for(k = 1; k < 8; k++) {

  2863.                     block[k << 3] = ac_val[k] * scale;

  2864.                     if(!v->pquantizer && block[k << 3])

  2865.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2866.                 }

  2867.             } else { //top

  2868.                 for(k = 1; k < 8; k++) {

  2869.                     block[k] = ac_val[k + 8] * scale;

  2870.                     if(!v->pquantizer && block[k])

  2871.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2872.                 }

  2873.             }

  2874.             i = 63;

  2875.         }

  2876.     }

  2877.     s->block_last_index[n] = i;

  2878. 

  2879.     return 0;

  2880. }

  2881. 

  2882. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2883.  * @param v VC1Context

  2884.  * @param block block to decode

  2885.  * @param coded are AC coeffs present or not

  2886.  * @param codingset set of VLC to decode data

  2887.  */

  2888. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2889. {

  2890.     GetBitContext *gb = &v->s.gb;

  2891.     MpegEncContext *s = &v->s;

  2892.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2893.     int run_diff, i;

  2894.     int16_t *dc_val;

  2895.     int16_t *ac_val, *ac_val2;

  2896.     int dcdiff;

  2897.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2898.     int use_pred = s->ac_pred;

  2899.     int scale;

  2900.     int q1, q2 = 0;

  2901.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2902. 

  2903.     /* Get DC differential */

  2904.     if (n < 4) {

  2905.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2906.     } else {

  2907.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2908.     }

  2909.     if (dcdiff < 0){

  2910.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2911.         return -1;

  2912.     }

  2913.     if (dcdiff)

  2914.     {

  2915.         if (dcdiff == 119 /* ESC index value */)

  2916.         {

  2917.             /* TODO: Optimize */

  2918.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2919.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2920.             else dcdiff = get_bits(gb, 8);

  2921.         }

  2922.         else

  2923.         {

  2924.             if (mquant == 1)

  2925.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2926.             else if (mquant == 2)

  2927.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2928.         }

  2929.         if (get_bits(gb, 1))

  2930.             dcdiff = -dcdiff;

  2931.     }

  2932. 

  2933.     /* Prediction */

  2934.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2935.     *dc_val = dcdiff;

  2936. 

  2937.     /* Store the quantized DC coeff, used for prediction */

  2938.     if (n < 4) {

  2939.         block[0] = dcdiff * s->y_dc_scale;

  2940.     } else {

  2941.         block[0] = dcdiff * s->c_dc_scale;

  2942.     }

  2943.     /* Skip ? */

  2944.     run_diff = 0;

  2945.     i = 0;

  2946. 

  2947.     //AC Decoding

  2948.     i = 1;

  2949. 

  2950.     /* check if AC is needed at all and adjust direction if needed */

  2951.     if(!a_avail) dc_pred_dir = 1;

  2952.     if(!c_avail) dc_pred_dir = 0;

  2953.     if(!a_avail && !c_avail) use_pred = 0;

  2954.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2955.     ac_val2 = ac_val;

  2956. 

  2957.     scale = mquant * 2 + v->halfpq;

  2958. 

  2959.     if(dc_pred_dir) //left

  2960.         ac_val -= 16;

  2961.     else //top

  2962.         ac_val -= 16 * s->block_wrap[n];

  2963. 

  2964.     q1 = s->current_picture.qscale_table[mb_pos];

  2965.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2966.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2967.     if(dc_pred_dir && n==1) q2 = q1;

  2968.     if(!dc_pred_dir && n==2) q2 = q1;

  2969.     if(n==3) q2 = q1;

  2970. 

  2971.     if(coded) {

  2972.         int last = 0, skip, value;

  2973.         const int8_t *zz_table;

  2974.         int k;

  2975. 

  2976.         if(v->s.ac_pred) {

  2977.             if(!dc_pred_dir)

  2978.                 zz_table = vc1_horizontal_zz;

  2979.             else

  2980.                 zz_table = vc1_vertical_zz;

  2981.         } else

  2982.             zz_table = vc1_normal_zz;

  2983. 

  2984.         while (!last) {

  2985.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2986.             i += skip;

  2987.             if(i > 63)

  2988.                 break;

  2989.             block[zz_table[i++]] = value;

  2990.         }

  2991. 

  2992.         /* apply AC prediction if needed */

  2993.         if(use_pred) {

  2994.             /* scale predictors if needed*/

  2995.             if(q2 && q1!=q2) {

  2996.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2997.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2998. 

  2999.                 if(dc_pred_dir) { //left

  3000.                     for(k = 1; k < 8; k++)

  3001.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3002.                 } else { //top

  3003.                     for(k = 1; k < 8; k++)

  3004.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3005.                 }

  3006.             } else {

  3007.                 if(dc_pred_dir) { //left

  3008.                     for(k = 1; k < 8; k++)

  3009.                         block[k << 3] += ac_val[k];

  3010.                 } else { //top

  3011.                     for(k = 1; k < 8; k++)

  3012.                         block[k] += ac_val[k + 8];

  3013.                 }

  3014.             }

  3015.         }

  3016.         /* save AC coeffs for further prediction */

  3017.         for(k = 1; k < 8; k++) {

  3018.             ac_val2[k] = block[k << 3];

  3019.             ac_val2[k + 8] = block[k];

  3020.         }

  3021. 

  3022.         /* scale AC coeffs */

  3023.         for(k = 1; k < 64; k++)

  3024.             if(block[k]) {

  3025.                 block[k] *= scale;

  3026.                 if(!v->pquantizer)

  3027.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3028.             }

  3029. 

  3030.         if(use_pred) i = 63;

  3031.     } else { // no AC coeffs

  3032.         int k;

  3033. 

  3034.         memset(ac_val2, 0, 16 * 2);

  3035.         if(dc_pred_dir) {//left

  3036.             if(use_pred) {

  3037.                 memcpy(ac_val2, ac_val, 8 * 2);

  3038.                 if(q2 && q1!=q2) {

  3039.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3040.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3041.                     for(k = 1; k < 8; k++)

  3042.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3043.                 }

  3044.             }

  3045.         } else {//top

  3046.             if(use_pred) {

  3047.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3048.                 if(q2 && q1!=q2) {

  3049.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3050.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3051.                     for(k = 1; k < 8; k++)

  3052.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3053.                 }

  3054.             }

  3055.         }

  3056. 

  3057.         /* apply AC prediction if needed */

  3058.         if(use_pred) {

  3059.             if(dc_pred_dir) { //left

  3060.                 for(k = 1; k < 8; k++) {

  3061.                     block[k << 3] = ac_val2[k] * scale;

  3062.                     if(!v->pquantizer && block[k << 3])

  3063.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3064.                 }

  3065.             } else { //top

  3066.                 for(k = 1; k < 8; k++) {

  3067.                     block[k] = ac_val2[k + 8] * scale;

  3068.                     if(!v->pquantizer && block[k])

  3069.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3070.                 }

  3071.             }

  3072.             i = 63;

  3073.         }

  3074.     }

  3075.     s->block_last_index[n] = i;

  3076. 

  3077.     return 0;

  3078. }

  3079. 

  3080. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  3081.  * @param v VC1Context

  3082.  * @param block block to decode

  3083.  * @param coded are AC coeffs present or not

  3084.  * @param mquant block quantizer

  3085.  * @param codingset set of VLC to decode data

  3086.  */

  3087. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  3088. {

  3089.     GetBitContext *gb = &v->s.gb;

  3090.     MpegEncContext *s = &v->s;

  3091.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  3092.     int run_diff, i;

  3093.     int16_t *dc_val;

  3094.     int16_t *ac_val, *ac_val2;

  3095.     int dcdiff;

  3096.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3097.     int a_avail = v->a_avail, c_avail = v->c_avail;

  3098.     int use_pred = s->ac_pred;

  3099.     int scale;

  3100.     int q1, q2 = 0;

  3101. 

  3102.     /* XXX: Guard against dumb values of mquant */

  3103.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  3104. 

  3105.     /* Set DC scale - y and c use the same */

  3106.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  3107.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  3108. 

  3109.     /* Get DC differential */

  3110.     if (n < 4) {

  3111.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3112.     } else {

  3113.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3114.     }

  3115.     if (dcdiff < 0){

  3116.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  3117.         return -1;

  3118.     }

  3119.     if (dcdiff)

  3120.     {

  3121.         if (dcdiff == 119 /* ESC index value */)

  3122.         {

  3123.             /* TODO: Optimize */

  3124.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  3125.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  3126.             else dcdiff = get_bits(gb, 8);

  3127.         }

  3128.         else

  3129.         {

  3130.             if (mquant == 1)

  3131.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  3132.             else if (mquant == 2)

  3133.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  3134.         }

  3135.         if (get_bits(gb, 1))

  3136.             dcdiff = -dcdiff;

  3137.     }

  3138. 

  3139.     /* Prediction */

  3140.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  3141.     *dc_val = dcdiff;

  3142. 

  3143.     /* Store the quantized DC coeff, used for prediction */

  3144. 

  3145.     if (n < 4) {

  3146.         block[0] = dcdiff * s->y_dc_scale;

  3147.     } else {

  3148.         block[0] = dcdiff * s->c_dc_scale;

  3149.     }

  3150.     /* Skip ? */

  3151.     run_diff = 0;

  3152.     i = 0;

  3153. 

  3154.     //AC Decoding

  3155.     i = 1;

  3156. 

  3157.     /* check if AC is needed at all and adjust direction if needed */

  3158.     if(!a_avail) dc_pred_dir = 1;

  3159.     if(!c_avail) dc_pred_dir = 0;

  3160.     if(!a_avail && !c_avail) use_pred = 0;

  3161.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3162.     ac_val2 = ac_val;

  3163. 

  3164.     scale = mquant * 2 + v->halfpq;

  3165. 

  3166.     if(dc_pred_dir) //left

  3167.         ac_val -= 16;

  3168.     else //top

  3169.         ac_val -= 16 * s->block_wrap[n];

  3170. 

  3171.     q1 = s->current_picture.qscale_table[mb_pos];

  3172.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  3173.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3174.     if(dc_pred_dir && n==1) q2 = q1;

  3175.     if(!dc_pred_dir && n==2) q2 = q1;

  3176.     if(n==3) q2 = q1;

  3177. 

  3178.     if(coded) {

  3179.         int last = 0, skip, value;

  3180.         const int8_t *zz_table;

  3181.         int k;

  3182. 

  3183.         zz_table = vc1_simple_progressive_8x8_zz;

  3184. 

  3185.         while (!last) {

  3186.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3187.             i += skip;

  3188.             if(i > 63)

  3189.                 break;

  3190.             block[zz_table[i++]] = value;

  3191.         }

  3192. 

  3193.         /* apply AC prediction if needed */

  3194.         if(use_pred) {

  3195.             /* scale predictors if needed*/

  3196.             if(q2 && q1!=q2) {

  3197.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3198.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3199. 

  3200.                 if(dc_pred_dir) { //left

  3201.                     for(k = 1; k < 8; k++)

  3202.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3203.                 } else { //top

  3204.                     for(k = 1; k < 8; k++)

  3205.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3206.                 }

  3207.             } else {

  3208.                 if(dc_pred_dir) { //left

  3209.                     for(k = 1; k < 8; k++)

  3210.                         block[k << 3] += ac_val[k];

  3211.                 } else { //top

  3212.                     for(k = 1; k < 8; k++)

  3213.                         block[k] += ac_val[k + 8];

  3214.                 }

  3215.             }

  3216.         }

  3217.         /* save AC coeffs for further prediction */

  3218.         for(k = 1; k < 8; k++) {

  3219.             ac_val2[k] = block[k << 3];

  3220.             ac_val2[k + 8] = block[k];

  3221.         }

  3222. 

  3223.         /* scale AC coeffs */

  3224.         for(k = 1; k < 64; k++)

  3225.             if(block[k]) {

  3226.                 block[k] *= scale;

  3227.                 if(!v->pquantizer)

  3228.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3229.             }

  3230. 

  3231.         if(use_pred) i = 63;

  3232.     } else { // no AC coeffs

  3233.         int k;

  3234. 

  3235.         memset(ac_val2, 0, 16 * 2);

  3236.         if(dc_pred_dir) {//left

  3237.             if(use_pred) {

  3238.                 memcpy(ac_val2, ac_val, 8 * 2);

  3239.                 if(q2 && q1!=q2) {

  3240.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3241.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3242.                     for(k = 1; k < 8; k++)

  3243.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3244.                 }

  3245.             }

  3246.         } else {//top

  3247.             if(use_pred) {

  3248.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3249.                 if(q2 && q1!=q2) {

  3250.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3251.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3252.                     for(k = 1; k < 8; k++)

  3253.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3254.                 }

  3255.             }

  3256.         }

  3257. 

  3258.         /* apply AC prediction if needed */

  3259.         if(use_pred) {

  3260.             if(dc_pred_dir) { //left

  3261.                 for(k = 1; k < 8; k++) {

  3262.                     block[k << 3] = ac_val2[k] * scale;

  3263.                     if(!v->pquantizer && block[k << 3])

  3264.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3265.                 }

  3266.             } else { //top

  3267.                 for(k = 1; k < 8; k++) {

  3268.                     block[k] = ac_val2[k + 8] * scale;

  3269.                     if(!v->pquantizer && block[k])

  3270.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3271.                 }

  3272.             }

  3273.             i = 63;

  3274.         }

  3275.     }

  3276.     s->block_last_index[n] = i;

  3277. 

  3278.     return 0;

  3279. }

  3280. 

  3281. /** Decode P block

  3282.  */

  3283. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  3284. {

  3285.     MpegEncContext *s = &v->s;

  3286.     GetBitContext *gb = &s->gb;

  3287.     int i, j;

  3288.     int subblkpat = 0;

  3289.     int scale, off, idx, last, skip, value;

  3290.     int ttblk = ttmb & 7;

  3291. 

  3292.     if(ttmb == -1) {

  3293.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  3294.     }

  3295.     if(ttblk == TT_4X4) {

  3296.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3297.     }

  3298.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  3299.         subblkpat = decode012(gb);

  3300.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  3301.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  3302.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  3303.     }

  3304.     scale = 2 * mquant + v->halfpq;

  3305. 

  3306.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3307.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3308.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3309.         ttblk = TT_8X4;

  3310.     }

  3311.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3312.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3313.         ttblk = TT_4X8;

  3314.     }

  3315.     switch(ttblk) {

  3316.     case TT_8X8:

  3317.         i = 0;

  3318.         last = 0;

  3319.         while (!last) {

  3320.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3321.             i += skip;

  3322.             if(i > 63)

  3323.                 break;

  3324.             idx = vc1_simple_progressive_8x8_zz[i++];

  3325.             block[idx] = value * scale;

  3326.             if(!v->pquantizer)

  3327.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3328.         }

  3329.         s->dsp.vc1_inv_trans_8x8(block);

  3330.         break;

  3331.     case TT_4X4:

  3332.         for(j = 0; j < 4; j++) {

  3333.             last = subblkpat & (1 << (3 - j));

  3334.             i = 0;

  3335.             off = (j & 1) * 4 + (j & 2) * 16;

  3336.             while (!last) {

  3337.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3338.                 i += skip;

  3339.                 if(i > 15)

  3340.                     break;

  3341.                 idx = vc1_simple_progressive_4x4_zz[i++];

  3342.                 block[idx + off] = value * scale;

  3343.                 if(!v->pquantizer)

  3344.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3345.             }

  3346.             if(!(subblkpat & (1 << (3 - j))))

  3347.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3348.         }

  3349.         break;

  3350.     case TT_8X4:

  3351.         for(j = 0; j < 2; j++) {

  3352.             last = subblkpat & (1 << (1 - j));

  3353.             i = 0;

  3354.             off = j * 32;

  3355.             while (!last) {

  3356.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3357.                 i += skip;

  3358.                 if(i > 31)

  3359.                     break;

  3360.                 if(v->profile < PROFILE_ADVANCED)

  3361.                     idx = vc1_simple_progressive_8x4_zz[i++];

  3362.                 else

  3363.                     idx = vc1_adv_progressive_8x4_zz[i++];

  3364.                 block[idx + off] = value * scale;

  3365.                 if(!v->pquantizer)

  3366.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3367.             }

  3368.             if(!(subblkpat & (1 << (1 - j))))

  3369.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3370.         }

  3371.         break;

  3372.     case TT_4X8:

  3373.         for(j = 0; j < 2; j++) {

  3374.             last = subblkpat & (1 << (1 - j));

  3375.             i = 0;

  3376.             off = j * 4;

  3377.             while (!last) {

  3378.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3379.                 i += skip;

  3380.                 if(i > 31)

  3381.                     break;

  3382.                 if(v->profile < PROFILE_ADVANCED)

  3383.                     idx = vc1_simple_progressive_4x8_zz[i++];

  3384.                 else

  3385.                     idx = vc1_adv_progressive_4x8_zz[i++];

  3386.                 block[idx + off] = value * scale;

  3387.                 if(!v->pquantizer)

  3388.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3389.             }

  3390.             if(!(subblkpat & (1 << (1 - j))))

  3391.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3392.         }

  3393.         break;

  3394.     }

  3395.     return 0;

  3396. }

  3397. 

  3398. 

  3399. /** Decode one P-frame MB (in Simple/Main profile)

  3400.  */

  3401. static int vc1_decode_p_mb(VC1Context *v)

  3402. {

  3403.     MpegEncContext *s = &v->s;

  3404.     GetBitContext *gb = &s->gb;

  3405.     int i, j;

  3406.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3407.     int cbp; /* cbp decoding stuff */

  3408.     int mqdiff, mquant; /* MB quantization */

  3409.     int ttmb = v->ttfrm; /* MB Transform type */

  3410.     int status;

  3411. 

  3412.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3413.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3414.     int mb_has_coeffs = 1; /* last_flag */

  3415.     int dmv_x, dmv_y; /* Differential MV components */

  3416.     int index, index1; /* LUT indices */

  3417.     int val, sign; /* temp values */

  3418.     int first_block = 1;

  3419.     int dst_idx, off;

  3420.     int skipped, fourmv;

  3421. 

  3422.     mquant = v->pq; /* Loosy initialization */

  3423. 

  3424.     if (v->mv_type_is_raw)

  3425.         fourmv = get_bits1(gb);

  3426.     else

  3427.         fourmv = v->mv_type_mb_plane[mb_pos];

  3428.     if (v->skip_is_raw)

  3429.         skipped = get_bits1(gb);

  3430.     else

  3431.         skipped = v->s.mbskip_table[mb_pos];

  3432. 

  3433.     s->dsp.clear_blocks(s->block[0]);

  3434. 

  3435.     if (!fourmv) /* 1MV mode */

  3436.     {

  3437.         if (!skipped)

  3438.         {

  3439.             GET_MVDATA(dmv_x, dmv_y);

  3440. 

  3441.             if (s->mb_intra) {

  3442.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3443.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3444.             }

  3445.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3446.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3447. 

  3448.             /* FIXME Set DC val for inter block ? */

  3449.             if (s->mb_intra && !mb_has_coeffs)

  3450.             {

  3451.                 GET_MQUANT();

  3452.                 s->ac_pred = get_bits(gb, 1);

  3453.                 cbp = 0;

  3454.             }

  3455.             else if (mb_has_coeffs)

  3456.             {

  3457.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3458.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3459.                 GET_MQUANT();

  3460.             }

  3461.             else

  3462.             {

  3463.                 mquant = v->pq;

  3464.                 cbp = 0;

  3465.             }

  3466.             s->current_picture.qscale_table[mb_pos] = mquant;

  3467. 

  3468.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3469.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  3470.                                 VC1_TTMB_VLC_BITS, 2);

  3471.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3472.             dst_idx = 0;

  3473.             for (i=0; i<6; i++)

  3474.             {

  3475.                 s->dc_val[0][s->block_index[i]] = 0;

  3476.                 dst_idx += i >> 2;

  3477.                 val = ((cbp >> (5 - i)) & 1);

  3478.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3479.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3480.                 if(s->mb_intra) {

  3481.                     /* check if prediction blocks A and C are available */

  3482.                     v->a_avail = v->c_avail = 0;

  3483.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3484.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3485.                     if(i == 1 || i == 3 || s->mb_x)

  3486.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3487. 

  3488.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3489.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3490.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3491.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3492.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3493.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3494.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3495.                     if(v->pq >= 9 && v->overlap) {

  3496.                         if(v->c_avail)

  3497.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3498.                         if(v->a_avail)

  3499.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3500.                     }

  3501.                 } else if(val) {

  3502.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3503.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3504.                     first_block = 0;

  3505.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3506.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3507.                 }

  3508.             }

  3509.         }

  3510.         else //Skipped

  3511.         {

  3512.             s->mb_intra = 0;

  3513.             for(i = 0; i < 6; i++) {

  3514.                 v->mb_type[0][s->block_index[i]] = 0;

  3515.                 s->dc_val[0][s->block_index[i]] = 0;

  3516.             }

  3517.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3518.             s->current_picture.qscale_table[mb_pos] = 0;

  3519.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3520.             vc1_mc_1mv(v, 0);

  3521.             return 0;

  3522.         }

  3523.     } //1MV mode

  3524.     else //4MV mode

  3525.     {

  3526.         if (!skipped /* unskipped MB */)

  3527.         {

  3528.             int intra_count = 0, coded_inter = 0;

  3529.             int is_intra[6], is_coded[6];

  3530.             /* Get CBPCY */

  3531.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3532.             for (i=0; i<6; i++)

  3533.             {

  3534.                 val = ((cbp >> (5 - i)) & 1);

  3535.                 s->dc_val[0][s->block_index[i]] = 0;

  3536.                 s->mb_intra = 0;

  3537.                 if(i < 4) {

  3538.                     dmv_x = dmv_y = 0;

  3539.                     s->mb_intra = 0;

  3540.                     mb_has_coeffs = 0;

  3541.                     if(val) {

  3542.                         GET_MVDATA(dmv_x, dmv_y);

  3543.                     }

  3544.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3545.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3546.                     intra_count += s->mb_intra;

  3547.                     is_intra[i] = s->mb_intra;

  3548.                     is_coded[i] = mb_has_coeffs;

  3549.                 }

  3550.                 if(i&4){

  3551.                     is_intra[i] = (intra_count >= 3);

  3552.                     is_coded[i] = val;

  3553.                 }

  3554.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3555.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3556.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3557.             }

  3558.             // if there are no coded blocks then don't do anything more

  3559.             if(!intra_count && !coded_inter) return 0;

  3560.             dst_idx = 0;

  3561.             GET_MQUANT();

  3562.             s->current_picture.qscale_table[mb_pos] = mquant;

  3563.             /* test if block is intra and has pred */

  3564.             {

  3565.                 int intrapred = 0;

  3566.                 for(i=0; i<6; i++)

  3567.                     if(is_intra[i]) {

  3568.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3569.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3570.                             intrapred = 1;

  3571.                             break;

  3572.                         }

  3573.                     }

  3574.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3575.                 else s->ac_pred = 0;

  3576.             }

  3577.             if (!v->ttmbf && coded_inter)

  3578.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3579.             for (i=0; i<6; i++)

  3580.             {

  3581.                 dst_idx += i >> 2;

  3582.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3583.                 s->mb_intra = is_intra[i];

  3584.                 if (is_intra[i]) {

  3585.                     /* check if prediction blocks A and C are available */

  3586.                     v->a_avail = v->c_avail = 0;

  3587.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3588.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3589.                     if(i == 1 || i == 3 || s->mb_x)

  3590.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3591. 

  3592.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3593.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3594.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3595.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3596.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3597.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3598.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3599.                     if(v->pq >= 9 && v->overlap) {

  3600.                         if(v->c_avail)

  3601.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3602.                         if(v->a_avail)

  3603.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3604.                     }

  3605.                 } else if(is_coded[i]) {

  3606.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3607.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3608.                     first_block = 0;

  3609.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3610.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3611.                 }

  3612.             }

  3613.             return status;

  3614.         }

  3615.         else //Skipped MB

  3616.         {

  3617.             s->mb_intra = 0;

  3618.             s->current_picture.qscale_table[mb_pos] = 0;

  3619.             for (i=0; i<6; i++) {

  3620.                 v->mb_type[0][s->block_index[i]] = 0;

  3621.                 s->dc_val[0][s->block_index[i]] = 0;

  3622.             }

  3623.             for (i=0; i<4; i++)

  3624.             {

  3625.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3626.                 vc1_mc_4mv_luma(v, i);

  3627.             }

  3628.             vc1_mc_4mv_chroma(v);

  3629.             s->current_picture.qscale_table[mb_pos] = 0;

  3630.             return 0;

  3631.         }

  3632.     }

  3633. 

  3634.     /* Should never happen */

  3635.     return -1;

  3636. }

  3637. 

  3638. /** Decode one B-frame MB (in Main profile)

  3639.  */

  3640. static void vc1_decode_b_mb(VC1Context *v)

  3641. {

  3642.     MpegEncContext *s = &v->s;

  3643.     GetBitContext *gb = &s->gb;

  3644.     int i, j;

  3645.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3646.     int cbp = 0; /* cbp decoding stuff */

  3647.     int mqdiff, mquant; /* MB quantization */

  3648.     int ttmb = v->ttfrm; /* MB Transform type */

  3649. 

  3650.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3651.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3652.     int mb_has_coeffs = 0; /* last_flag */

  3653.     int index, index1; /* LUT indices */

  3654.     int val, sign; /* temp values */

  3655.     int first_block = 1;

  3656.     int dst_idx, off;

  3657.     int skipped, direct;

  3658.     int dmv_x[2], dmv_y[2];

  3659.     int bmvtype = BMV_TYPE_BACKWARD;

  3660. 

  3661.     mquant = v->pq; /* Loosy initialization */

  3662.     s->mb_intra = 0;

  3663. 

  3664.     if (v->dmb_is_raw)

  3665.         direct = get_bits1(gb);

  3666.     else

  3667.         direct = v->direct_mb_plane[mb_pos];

  3668.     if (v->skip_is_raw)

  3669.         skipped = get_bits1(gb);

  3670.     else

  3671.         skipped = v->s.mbskip_table[mb_pos];

  3672. 

  3673.     s->dsp.clear_blocks(s->block[0]);

  3674.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3675.     for(i = 0; i < 6; i++) {

  3676.         v->mb_type[0][s->block_index[i]] = 0;

  3677.         s->dc_val[0][s->block_index[i]] = 0;

  3678.     }

  3679.     s->current_picture.qscale_table[mb_pos] = 0;

  3680. 

  3681.     if (!direct) {

  3682.         if (!skipped) {

  3683.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3684.             dmv_x[1] = dmv_x[0];

  3685.             dmv_y[1] = dmv_y[0];

  3686.         }

  3687.         if(skipped || !s->mb_intra) {

  3688.             bmvtype = decode012(gb);

  3689.             switch(bmvtype) {

  3690.             case 0:

  3691.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3692.                 break;

  3693.             case 1:

  3694.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3695.                 break;

  3696.             case 2:

  3697.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3698.                 dmv_x[0] = dmv_y[0] = 0;

  3699.             }

  3700.         }

  3701.     }

  3702.     for(i = 0; i < 6; i++)

  3703.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3704. 

  3705.     if (skipped) {

  3706.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3707.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3708.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3709.         return;

  3710.     }

  3711.     if (direct) {

  3712.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3713.         GET_MQUANT();

  3714.         s->mb_intra = 0;

  3715.         mb_has_coeffs = 0;

  3716.         s->current_picture.qscale_table[mb_pos] = mquant;

  3717.         if(!v->ttmbf)

  3718.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3719.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3720.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3721.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3722.     } else {

  3723.         if(!mb_has_coeffs && !s->mb_intra) {

  3724.             /* no coded blocks - effectively skipped */

  3725.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3726.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3727.             return;

  3728.         }

  3729.         if(s->mb_intra && !mb_has_coeffs) {

  3730.             GET_MQUANT();

  3731.             s->current_picture.qscale_table[mb_pos] = mquant;

  3732.             s->ac_pred = get_bits1(gb);

  3733.             cbp = 0;

  3734.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3735.         } else {

  3736.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3737.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3738.                 if(!mb_has_coeffs) {

  3739.                     /* interpolated skipped block */

  3740.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3741.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3742.                     return;

  3743.                 }

  3744.             }

  3745.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3746.             if(!s->mb_intra) {

  3747.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3748.             }

  3749.             if(s->mb_intra)

  3750.                 s->ac_pred = get_bits1(gb);

  3751.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3752.             GET_MQUANT();

  3753.             s->current_picture.qscale_table[mb_pos] = mquant;

  3754.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3755.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3756.         }

  3757.     }

  3758.     dst_idx = 0;

  3759.     for (i=0; i<6; i++)

  3760.     {

  3761.         s->dc_val[0][s->block_index[i]] = 0;

  3762.         dst_idx += i >> 2;

  3763.         val = ((cbp >> (5 - i)) & 1);

  3764.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3765.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3766.         if(s->mb_intra) {

  3767.             /* check if prediction blocks A and C are available */

  3768.             v->a_avail = v->c_avail = 0;

  3769.             if(i == 2 || i == 3 || !s->first_slice_line)

  3770.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3771.             if(i == 1 || i == 3 || s->mb_x)

  3772.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3773. 

  3774.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3775.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3776.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3777.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3778.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3779.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3780.         } else if(val) {

  3781.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3782.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3783.             first_block = 0;

  3784.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3785.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3786.         }

  3787.     }

  3788. }

  3789. 

  3790. /** Decode blocks of I-frame

  3791.  */

  3792. static void vc1_decode_i_blocks(VC1Context *v)

  3793. {

  3794.     int k, j;

  3795.     MpegEncContext *s = &v->s;

  3796.     int cbp, val;

  3797.     uint8_t *coded_val;

  3798.     int mb_pos;

  3799. 

  3800.     /* select codingmode used for VLC tables selection */

  3801.     switch(v->y_ac_table_index){

  3802.     case 0:

  3803.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3804.         break;

  3805.     case 1:

  3806.         v->codingset = CS_HIGH_MOT_INTRA;

  3807.         break;

  3808.     case 2:

  3809.         v->codingset = CS_MID_RATE_INTRA;

  3810.         break;

  3811.     }

  3812. 

  3813.     switch(v->c_ac_table_index){

  3814.     case 0:

  3815.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3816.         break;

  3817.     case 1:

  3818.         v->codingset2 = CS_HIGH_MOT_INTER;

  3819.         break;

  3820.     case 2:

  3821.         v->codingset2 = CS_MID_RATE_INTER;

  3822.         break;

  3823.     }

  3824. 

  3825.     /* Set DC scale - y and c use the same */

  3826.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3827.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3828. 

  3829.     //do frame decode

  3830.     s->mb_x = s->mb_y = 0;

  3831.     s->mb_intra = 1;

  3832.     s->first_slice_line = 1;

  3833.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3834.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3835.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3836.             ff_init_block_index(s);

  3837.             ff_update_block_index(s);

  3838.             s->dsp.clear_blocks(s->block[0]);

  3839.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3840.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3841.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3842.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3843.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3844. 

  3845.             // do actual MB decoding and displaying

  3846.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3847.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3848. 

  3849.             for(k = 0; k < 6; k++) {

  3850.                 val = ((cbp >> (5 - k)) & 1);

  3851. 

  3852.                 if (k < 4) {

  3853.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3854.                     val = val ^ pred;

  3855.                     *coded_val = val;

  3856.                 }

  3857.                 cbp |= val << (5 - k);

  3858. 

  3859.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3860. 

  3861.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3862.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3863.                 if(v->pq >= 9 && v->overlap) {

  3864.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3865.                 }

  3866.             }

  3867. 

  3868.             vc1_put_block(v, s->block);

  3869.             if(v->pq >= 9 && v->overlap) {

  3870.                 if(s->mb_x) {

  3871.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3872.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3873.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3874.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3875.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3876.                     }

  3877.                 }

  3878.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3879.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3880.                 if(!s->first_slice_line) {

  3881.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3882.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3883.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3884.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3885.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3886.                     }

  3887.                 }

  3888.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3889.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3890.             }

  3891. 

  3892.             if(get_bits_count(&s->gb) > v->bits) {

  3893.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3894.                 return;

  3895.             }

  3896.         }

  3897.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3898.         s->first_slice_line = 0;

  3899.     }

  3900. }

  3901. 

  3902. /** Decode blocks of I-frame for advanced profile

  3903.  */

  3904. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3905. {

  3906.     int k, j;

  3907.     MpegEncContext *s = &v->s;

  3908.     int cbp, val;

  3909.     uint8_t *coded_val;

  3910.     int mb_pos;

  3911.     int mquant = v->pq;

  3912.     int mqdiff;

  3913.     int overlap;

  3914.     GetBitContext *gb = &s->gb;

  3915. 

  3916.     /* select codingmode used for VLC tables selection */

  3917.     switch(v->y_ac_table_index){

  3918.     case 0:

  3919.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3920.         break;

  3921.     case 1:

  3922.         v->codingset = CS_HIGH_MOT_INTRA;

  3923.         break;

  3924.     case 2:

  3925.         v->codingset = CS_MID_RATE_INTRA;

  3926.         break;

  3927.     }

  3928. 

  3929.     switch(v->c_ac_table_index){

  3930.     case 0:

  3931.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3932.         break;

  3933.     case 1:

  3934.         v->codingset2 = CS_HIGH_MOT_INTER;

  3935.         break;

  3936.     case 2:

  3937.         v->codingset2 = CS_MID_RATE_INTER;

  3938.         break;

  3939.     }

  3940. 

  3941.     //do frame decode

  3942.     s->mb_x = s->mb_y = 0;

  3943.     s->mb_intra = 1;

  3944.     s->first_slice_line = 1;

  3945.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3946.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3947.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3948.             ff_init_block_index(s);

  3949.             ff_update_block_index(s);

  3950.             s->dsp.clear_blocks(s->block[0]);

  3951.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3952.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3953.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3954.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3955. 

  3956.             // do actual MB decoding and displaying

  3957.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3958.             if(v->acpred_is_raw)

  3959.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3960.             else

  3961.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3962. 

  3963.             if(v->condover == CONDOVER_SELECT) {

  3964.                 if(v->overflg_is_raw)

  3965.                     overlap = get_bits(&v->s.gb, 1);

  3966.                 else

  3967.                     overlap = v->over_flags_plane[mb_pos];

  3968.             } else

  3969.                 overlap = (v->condover == CONDOVER_ALL);

  3970. 

  3971.             GET_MQUANT();

  3972. 

  3973.             s->current_picture.qscale_table[mb_pos] = mquant;

  3974.             /* Set DC scale - y and c use the same */

  3975.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3976.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3977. 

  3978.             for(k = 0; k < 6; k++) {

  3979.                 val = ((cbp >> (5 - k)) & 1);

  3980. 

  3981.                 if (k < 4) {

  3982.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3983.                     val = val ^ pred;

  3984.                     *coded_val = val;

  3985.                 }

  3986.                 cbp |= val << (5 - k);

  3987. 

  3988.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3989.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3990. 

  3991.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3992. 

  3993.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3994.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3995.             }

  3996. 

  3997.             vc1_put_block(v, s->block);

  3998.             if(overlap) {

  3999.                 if(s->mb_x) {

  4000.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4001.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4002.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  4003.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4004.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4005.                     }

  4006.                 }

  4007.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4008.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4009.                 if(!s->first_slice_line) {

  4010.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4011.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4012.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  4013.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4014.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4015.                     }

  4016.                 }

  4017.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4018.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4019.             }

  4020. 

  4021.             if(get_bits_count(&s->gb) > v->bits) {

  4022.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  4023.                 return;

  4024.             }

  4025.         }

  4026.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4027.         s->first_slice_line = 0;

  4028.     }

  4029. }

  4030. 

  4031. static void vc1_decode_p_blocks(VC1Context *v)

  4032. {

  4033.     MpegEncContext *s = &v->s;

  4034. 

  4035.     /* select codingmode used for VLC tables selection */

  4036.     switch(v->c_ac_table_index){

  4037.     case 0:

  4038.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4039.         break;

  4040.     case 1:

  4041.         v->codingset = CS_HIGH_MOT_INTRA;

  4042.         break;

  4043.     case 2:

  4044.         v->codingset = CS_MID_RATE_INTRA;

  4045.         break;

  4046.     }

  4047. 

  4048.     switch(v->c_ac_table_index){

  4049.     case 0:

  4050.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4051.         break;

  4052.     case 1:

  4053.         v->codingset2 = CS_HIGH_MOT_INTER;

  4054.         break;

  4055.     case 2:

  4056.         v->codingset2 = CS_MID_RATE_INTER;

  4057.         break;

  4058.     }

  4059. 

  4060.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4061.     s->first_slice_line = 1;

  4062.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4063.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  4064.             ff_init_block_index(s);

  4065.             ff_update_block_index(s);

  4066.             s->dsp.clear_blocks(s->block[0]);

  4067. 

  4068.             vc1_decode_p_mb(v);

  4069.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4070.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);

  4071.                 return;

  4072.             }

  4073.         }

  4074.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4075.         s->first_slice_line = 0;

  4076.     }

  4077. }

  4078. 

  4079. static void vc1_decode_b_blocks(VC1Context *v)

  4080. {

  4081.     MpegEncContext *s = &v->s;

  4082. 

  4083.     /* select codingmode used for VLC tables selection */

  4084.     switch(v->c_ac_table_index){

  4085.     case 0:

  4086.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4087.         break;

  4088.     case 1:

  4089.         v->codingset = CS_HIGH_MOT_INTRA;

  4090.         break;

  4091.     case 2:

  4092.         v->codingset = CS_MID_RATE_INTRA;

  4093.         break;

  4094.     }

  4095. 

  4096.     switch(v->c_ac_table_index){

  4097.     case 0:

  4098.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4099.         break;

  4100.     case 1:

  4101.         v->codingset2 = CS_HIGH_MOT_INTER;

  4102.         break;

  4103.     case 2:

  4104.         v->codingset2 = CS_MID_RATE_INTER;

  4105.         break;

  4106.     }

  4107. 

  4108.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4109.     s->first_slice_line = 1;

  4110.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4111.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  4112.             ff_init_block_index(s);

  4113.             ff_update_block_index(s);

  4114.             s->dsp.clear_blocks(s->block[0]);

  4115. 

  4116.             vc1_decode_b_mb(v);

  4117.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4118.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);

  4119.                 return;

  4120.             }

  4121.         }

  4122.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4123.         s->first_slice_line = 0;

  4124.     }

  4125. }

  4126. 

  4127. static void vc1_decode_skip_blocks(VC1Context *v)

  4128. {

  4129.     MpegEncContext *s = &v->s;

  4130. 

  4131.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4132.     s->first_slice_line = 1;

  4133.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4134.         s->mb_x = 0;

  4135.         ff_init_block_index(s);

  4136.         ff_update_block_index(s);

  4137.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  4138.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4139.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4140.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4141.         s->first_slice_line = 0;

  4142.     }

  4143.     s->pict_type = P_TYPE;

  4144. }

  4145. 

  4146. static void vc1_decode_blocks(VC1Context *v)

  4147. {

  4148. 

  4149.     v->s.esc3_level_length = 0;

  4150. 

  4151.     switch(v->s.pict_type) {

  4152.     case I_TYPE:

  4153.         if(v->profile == PROFILE_ADVANCED)

  4154.             vc1_decode_i_blocks_adv(v);

  4155.         else

  4156.             vc1_decode_i_blocks(v);

  4157.         break;

  4158.     case P_TYPE:

  4159.         if(v->p_frame_skipped)

  4160.             vc1_decode_skip_blocks(v);

  4161.         else

  4162.             vc1_decode_p_blocks(v);

  4163.         break;

  4164.     case B_TYPE:

  4165.         if(v->bi_type){

  4166.             if(v->profile == PROFILE_ADVANCED)

  4167.                 vc1_decode_i_blocks_adv(v);

  4168.             else

  4169.                 vc1_decode_i_blocks(v);

  4170.         }else

  4171.             vc1_decode_b_blocks(v);

  4172.         break;

  4173.     }

  4174. }

  4175. 

  4176. #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)

  4177. 

  4178. /** Find VC-1 marker in buffer

  4179.  * @return position where next marker starts or end of buffer if no marker found

  4180.  */

  4181. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  4182. {

  4183.     uint32_t mrk = 0xFFFFFFFF;

  4184. 

  4185.     if(end-src < 4) return end;

  4186.     while(src < end){

  4187.         mrk = (mrk << 8) | *src++;

  4188.         if(IS_MARKER(mrk))

  4189.             return src-4;

  4190.     }

  4191.     return end;

  4192. }

  4193. 

  4194. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  4195. {

  4196.     int dsize = 0, i;

  4197. 

  4198.     if(size < 4){

  4199.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  4200.         return size;

  4201.     }

  4202.     for(i = 0; i < size; i++, src++) {

  4203.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  4204.             dst[dsize++] = src[1];

  4205.             src++;

  4206.             i++;

  4207.         } else

  4208.             dst[dsize++] = *src;

  4209.     }

  4210.     return dsize;

  4211. }

  4212. 

  4213. /** Initialize a VC1/WMV3 decoder

  4214.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4215.  * @todo TODO: Decypher remaining bits in extra_data

  4216.  */

  4217. static int vc1_decode_init(AVCodecContext *avctx)

  4218. {

  4219.     VC1Context *v = avctx->priv_data;

  4220.     MpegEncContext *s = &v->s;

  4221.     GetBitContext gb;

  4222. 

  4223.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  4224.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  4225.         avctx->pix_fmt = PIX_FMT_YUV420P;

  4226.     else

  4227.         avctx->pix_fmt = PIX_FMT_GRAY8;

  4228.     v->s.avctx = avctx;

  4229.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  4230.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  4231. 

  4232.     if(ff_h263_decode_init(avctx) < 0)

  4233.         return -1;

  4234.     if (vc1_init_common(v) < 0) return -1;

  4235. 

  4236.     avctx->coded_width = avctx->width;

  4237.     avctx->coded_height = avctx->height;

  4238.     if (avctx->codec_id == CODEC_ID_WMV3)

  4239.     {

  4240.         int count = 0;

  4241. 

  4242.         // looks like WMV3 has a sequence header stored in the extradata

  4243.         // advanced sequence header may be before the first frame

  4244.         // the last byte of the extradata is a version number, 1 for the

  4245.         // samples we can decode

  4246. 

  4247.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  4248. 

  4249.         if (decode_sequence_header(avctx, &gb) < 0)

  4250.           return -1;

  4251. 

  4252.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  4253.         if (count>0)

  4254.         {

  4255.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  4256.                    count, get_bits(&gb, count));

  4257.         }

  4258.         else if (count < 0)

  4259.         {

  4260.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  4261.         }

  4262.     } else { // VC1/WVC1

  4263.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  4264.         uint8_t *next; int size, buf2_size;

  4265.         uint8_t *buf2 = NULL;

  4266.         int seq_inited = 0, ep_inited = 0;

  4267. 

  4268.         if(avctx->extradata_size < 16) {

  4269.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  4270.             return -1;

  4271.         }

  4272. 

  4273.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4274.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  4275.         next = start;

  4276.         for(; next < end; start = next){

  4277.             next = find_next_marker(start + 4, end);

  4278.             size = next - start - 4;

  4279.             if(size <= 0) continue;

  4280.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  4281.             init_get_bits(&gb, buf2, buf2_size * 8);

  4282.             switch(AV_RB32(start)){

  4283.             case VC1_CODE_SEQHDR:

  4284.                 if(decode_sequence_header(avctx, &gb) < 0){

  4285.                     av_free(buf2);

  4286.                     return -1;

  4287.                 }

  4288.                 seq_inited = 1;

  4289.                 break;

  4290.             case VC1_CODE_ENTRYPOINT:

  4291.                 if(decode_entry_point(avctx, &gb) < 0){

  4292.                     av_free(buf2);

  4293.                     return -1;

  4294.                 }

  4295.                 ep_inited = 1;

  4296.                 break;

  4297.             }

  4298.         }

  4299.         av_free(buf2);

  4300.         if(!seq_inited || !ep_inited){

  4301.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  4302.             return -1;

  4303.         }

  4304.     }

  4305.     avctx->has_b_frames= !!(avctx->max_b_frames);

  4306.     s->low_delay = !avctx->has_b_frames;

  4307. 

  4308.     s->mb_width = (avctx->coded_width+15)>>4;

  4309.     s->mb_height = (avctx->coded_height+15)>>4;

  4310. 

  4311.     /* Allocate mb bitplanes */

  4312.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4313.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4314.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  4315.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  4316. 

  4317.     /* allocate block type info in that way so it could be used with s->block_index[] */

  4318.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  4319.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  4320.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  4321.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  4322. 

  4323.     /* Init coded blocks info */

  4324.     if (v->profile == PROFILE_ADVANCED)

  4325.     {

  4326. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  4327. //            return -1;

  4328. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  4329. //            return -1;

  4330.     }

  4331. 

  4332.     return 0;

  4333. }

  4334. 

  4335. 

  4336. /** Decode a VC1/WMV3 frame

  4337.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4338.  */

  4339. static int vc1_decode_frame(AVCodecContext *avctx,

  4340.                             void *data, int *data_size,

  4341.                             uint8_t *buf, int buf_size)

  4342. {

  4343.     VC1Context *v = avctx->priv_data;

  4344.     MpegEncContext *s = &v->s;

  4345.     AVFrame *pict = data;

  4346.     uint8_t *buf2 = NULL;

  4347. 

  4348.     /* no supplementary picture */

  4349.     if (buf_size == 0) {

  4350.         /* special case for last picture */

  4351.         if (s->low_delay==0 && s->next_picture_ptr) {

  4352.             *pict= *(AVFrame*)s->next_picture_ptr;

  4353.             s->next_picture_ptr= NULL;

  4354. 

  4355.             *data_size = sizeof(AVFrame);

  4356.         }

  4357. 

  4358.         return 0;

  4359.     }

  4360. 

  4361.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  4362.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4363.         int i= ff_find_unused_picture(s, 0);

  4364.         s->current_picture_ptr= &s->picture[i];

  4365.     }

  4366. 

  4367.     //for advanced profile we may need to parse and unescape data

  4368.     if (avctx->codec_id == CODEC_ID_VC1) {

  4369.         int buf_size2 = 0;

  4370.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4371. 

  4372.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4373.             uint8_t *start, *end, *next;

  4374.             int size;

  4375. 

  4376.             next = buf;

  4377.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4378.                 next = find_next_marker(start + 4, end);

  4379.                 size = next - start - 4;

  4380.                 if(size <= 0) continue;

  4381.                 switch(AV_RB32(start)){

  4382.                 case VC1_CODE_FRAME:

  4383.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4384.                     break;

  4385.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4386.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4387.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4388.                     decode_entry_point(avctx, &s->gb);

  4389.                     break;

  4390.                 case VC1_CODE_SLICE:

  4391.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4392.                     av_free(buf2);

  4393.                     return -1;

  4394.                 }

  4395.             }

  4396.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4397.             uint8_t *divider;

  4398. 

  4399.             divider = find_next_marker(buf, buf + buf_size);

  4400.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4401.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4402.                 return -1;

  4403.             }

  4404. 

  4405.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4406.             // TODO

  4407.             av_free(buf2);return -1;

  4408.         }else{

  4409.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4410.         }

  4411.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4412.     } else

  4413.         init_get_bits(&s->gb, buf, buf_size*8);

  4414.     // do parse frame header

  4415.     if(v->profile < PROFILE_ADVANCED) {

  4416.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4417.             av_free(buf2);

  4418.             return -1;

  4419.         }

  4420.     } else {

  4421.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4422.             av_free(buf2);

  4423.             return -1;

  4424.         }

  4425.     }

  4426. 

  4427.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4428.         av_free(buf2);

  4429.         return -1;

  4430.     }

  4431. 

  4432.     // for hurry_up==5

  4433.     s->current_picture.pict_type= s->pict_type;

  4434.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4435. 

  4436.     /* skip B-frames if we don't have reference frames */

  4437.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4438.         av_free(buf2);

  4439.         return -1;//buf_size;

  4440.     }

  4441.     /* skip b frames if we are in a hurry */

  4442.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4443.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4444.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4445.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4446.         av_free(buf2);

  4447.         return buf_size;

  4448.     }

  4449.     /* skip everything if we are in a hurry>=5 */

  4450.     if(avctx->hurry_up>=5) {

  4451.         av_free(buf2);

  4452.         return -1;//buf_size;

  4453.     }

  4454. 

  4455.     if(s->next_p_frame_damaged){

  4456.         if(s->pict_type==B_TYPE)

  4457.             return buf_size;

  4458.         else

  4459.             s->next_p_frame_damaged=0;

  4460.     }

  4461. 

  4462.     if(MPV_frame_start(s, avctx) < 0) {

  4463.         av_free(buf2);

  4464.         return -1;

  4465.     }

  4466. 

  4467.     ff_er_frame_start(s);

  4468. 

  4469.     v->bits = buf_size * 8;

  4470.     vc1_decode_blocks(v);

  4471. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4472. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4473. //      return -1;

  4474.     ff_er_frame_end(s);

  4475. 

  4476.     MPV_frame_end(s);

  4477. 

  4478. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4479. assert(s->current_picture.pict_type == s->pict_type);

  4480.     if (s->pict_type == B_TYPE || s->low_delay) {

  4481.         *pict= *(AVFrame*)s->current_picture_ptr;

  4482.     } else if (s->last_picture_ptr != NULL) {

  4483.         *pict= *(AVFrame*)s->last_picture_ptr;

  4484.     }

  4485. 

  4486.     if(s->last_picture_ptr || s->low_delay){

  4487.         *data_size = sizeof(AVFrame);

  4488.         ff_print_debug_info(s, pict);

  4489.     }

  4490. 

  4491.     /* Return the Picture timestamp as the frame number */

  4492.     /* we substract 1 because it is added on utils.c    */

  4493.     avctx->frame_number = s->picture_number - 1;

  4494. 

  4495.     av_free(buf2);

  4496.     return buf_size;

  4497. }

  4498. 

  4499. 

  4500. /** Close a VC1/WMV3 decoder

  4501.  * @warning Initial try at using MpegEncContext stuff

  4502.  */

  4503. static int vc1_decode_end(AVCodecContext *avctx)

  4504. {

  4505.     VC1Context *v = avctx->priv_data;

  4506. 

  4507.     av_freep(&v->hrd_rate);

  4508.     av_freep(&v->hrd_buffer);

  4509.     MPV_common_end(&v->s);

  4510.     av_freep(&v->mv_type_mb_plane);

  4511.     av_freep(&v->direct_mb_plane);

  4512.     av_freep(&v->acpred_plane);

  4513.     av_freep(&v->over_flags_plane);

  4514.     av_freep(&v->mb_type_base);

  4515.     return 0;

  4516. }

  4517. 

  4518. 

  4519. AVCodec vc1_decoder = {

  4520.     "vc1",

  4521.     CODEC_TYPE_VIDEO,

  4522.     CODEC_ID_VC1,

  4523.     sizeof(VC1Context),

  4524.     vc1_decode_init,

  4525.     NULL,

  4526.     vc1_decode_end,

  4527.     vc1_decode_frame,

  4528.     CODEC_CAP_DELAY,

  4529.     NULL

  4530. };

  4531. 

  4532. AVCodec wmv3_decoder = {

  4533.     "wmv3",

  4534.     CODEC_TYPE_VIDEO,

  4535.     CODEC_ID_WMV3,

  4536.     sizeof(VC1Context),

  4537.     vc1_decode_init,

  4538.     NULL,

  4539.     vc1_decode_end,

  4540.     vc1_decode_frame,

  4541.     CODEC_CAP_DELAY,

  4542.     NULL

  4543. };

  4544. 

  4545. #ifdef CONFIG_VC1_PARSER

  4546. /**

  4547.  * finds the end of the current frame in the bitstream.

  4548.  * @return the position of the first byte of the next frame, or -1

  4549.  */

  4550. static int vc1_find_frame_end(ParseContext *pc, const uint8_t *buf,

  4551.                                int buf_size) {

  4552.     int pic_found, i;

  4553.     uint32_t state;

  4554. 

  4555.     pic_found= pc->frame_start_found;

  4556.     state= pc->state;

  4557. 

  4558.     i=0;

  4559.     if(!pic_found){

  4560.         for(i=0; i<buf_size; i++){

  4561.             state= (state<<8) | buf[i];

  4562.             if(state == VC1_CODE_FRAME || state == VC1_CODE_FIELD){

  4563.                 i++;

  4564.                 pic_found=1;

  4565.                 break;

  4566.             }

  4567.         }

  4568.     }

  4569. 

  4570.     if(pic_found){

  4571.         /* EOF considered as end of frame */

  4572.         if (buf_size == 0)

  4573.             return 0;

  4574.         for(; i<buf_size; i++){

  4575.             state= (state<<8) | buf[i];

  4576.             if(IS_MARKER(state) && state != VC1_CODE_FIELD && state != VC1_CODE_SLICE){

  4577.                 pc->frame_start_found=0;

  4578.                 pc->state=-1;

  4579.                 return i-3;

  4580.             }

  4581.         }

  4582.     }

  4583.     pc->frame_start_found= pic_found;

  4584.     pc->state= state;

  4585.     return END_NOT_FOUND;

  4586. }

  4587. 

  4588. static int vc1_parse(AVCodecParserContext *s,

  4589.                            AVCodecContext *avctx,

  4590.                            uint8_t **poutbuf, int *poutbuf_size,

  4591.                            const uint8_t *buf, int buf_size)

  4592. {

  4593.     ParseContext *pc = s->priv_data;

  4594.     int next;

  4595. 

  4596.     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){

  4597.         next= buf_size;

  4598.     }else{

  4599.         next= vc1_find_frame_end(pc, buf, buf_size);

  4600. 

  4601.         if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {

  4602.             *poutbuf = NULL;

  4603.             *poutbuf_size = 0;

  4604.             return buf_size;

  4605.         }

  4606.     }

  4607.     *poutbuf = (uint8_t *)buf;

  4608.     *poutbuf_size = buf_size;

  4609.     return next;

  4610. }

  4611. 

  4612. static int vc1_split(AVCodecContext *avctx,

  4613.                            const uint8_t *buf, int buf_size)

  4614. {

  4615.     int i;

  4616.     uint32_t state= -1;

  4617. 

  4618.     for(i=0; i<buf_size; i++){

  4619.         state= (state<<8) | buf[i];

  4620.         if(IS_MARKER(state) && state != VC1_CODE_SEQHDR && state != VC1_CODE_ENTRYPOINT)

  4621.             return i-3;

  4622.     }

  4623.     return 0;

  4624. }

  4625. 

  4626. AVCodecParser vc1_parser = {

  4627.     { CODEC_ID_VC1 },

  4628.     sizeof(ParseContext1),

  4629.     NULL,

  4630.     vc1_parse,

  4631.     ff_parse1_close,

  4632.     vc1_split,

  4633. };

  4634. #endif /* CONFIG_VC1_PARSER */