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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2006 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.     src_x   = clip(  src_x, -16, s->mb_width  * 16);

  825.     src_y   = clip(  src_y, -16, s->mb_height * 16);

  826.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  827.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  828. 

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

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

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

  832. 

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

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

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

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

  837.     }

  838. 

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

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

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

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

  843. 

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

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

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

  847.         srcY = s->edge_emu_buffer;

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

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

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

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

  852.         srcU = uvbuf;

  853.         srcV = uvbuf + 16;

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

  855.         if(v->rangeredfrm) {

  856.             int i, j;

  857.             uint8_t *src, *src2;

  858. 

  859.             src = srcY;

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

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

  862.                 src += s->linesize;

  863.             }

  864.             src = srcU; src2 = srcV;

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

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

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

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

  869.                 }

  870.                 src += s->uvlinesize;

  871.                 src2 += s->uvlinesize;

  872.             }

  873.         }

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

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

  876.             int i, j;

  877.             uint8_t *src, *src2;

  878. 

  879.             src = srcY;

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

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

  882.                 src += s->linesize;

  883.             }

  884.             src = srcU; src2 = srcV;

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

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

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

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

  889.                 }

  890.                 src += s->uvlinesize;

  891.                 src2 += s->uvlinesize;

  892.             }

  893.         }

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

  895.     }

  896. 

  897.     if(s->mspel) {

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

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

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

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

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

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

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

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

  906. 

  907.         if(!v->rnd)

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

  909.         else

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

  911.     }

  912. 

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

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

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

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

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

  918.     if(!v->rnd){

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

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

  921.     }else{

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

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

  924.     }

  925. }

  926. 

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

  928.  */

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

  930. {

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

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

  933.     uint8_t *srcY;

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

  935.     int off;

  936. 

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

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

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

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

  941. 

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

  943. 

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

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

  946. 

  947.     src_x   = clip(  src_x, -16, s->mb_width  * 16);

  948.     src_y   = clip(  src_y, -16, s->mb_height * 16);

  949. 

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

  951. 

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

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

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

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

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

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

  958.         srcY = s->edge_emu_buffer;

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

  960.         if(v->rangeredfrm) {

  961.             int i, j;

  962.             uint8_t *src;

  963. 

  964.             src = srcY;

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

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

  967.                 src += s->linesize;

  968.             }

  969.         }

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

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

  972.             int i, j;

  973.             uint8_t *src;

  974. 

  975.             src = srcY;

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

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

  978.                 src += s->linesize;

  979.             }

  980.         }

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

  982.     }

  983. 

  984.     if(s->mspel) {

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

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

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

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

  989.         if(!v->rnd)

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

  991.         else

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

  993.     }

  994. }

  995. 

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

  997. {

  998.     if(a < b) {

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

  1000.         else      return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  1001.     } else {

  1002.         if(c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;

  1003.         else      return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  1004.     }

  1005. }

  1006. 

  1007. 

  1008. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1009.  */

  1010. static void vc1_mc_4mv_chroma(VC1Context *v)

  1011. {

  1012.     MpegEncContext *s = &v->s;

  1013.     DSPContext *dsp = &v->s.dsp;

  1014.     uint8_t *srcU, *srcV;

  1015.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1016.     int i, idx, tx = 0, ty = 0;

  1017.     int mvx[4], mvy[4], intra[4];

  1018.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1019. 

  1020.     if(!v->s.last_picture.data[0])return;

  1021.     if(s->flags & CODEC_FLAG_GRAY) return;

  1022. 

  1023.     for(i = 0; i < 4; i++) {

  1024.         mvx[i] = s->mv[0][i][0];

  1025.         mvy[i] = s->mv[0][i][1];

  1026.         intra[i] = v->mb_type[0][s->block_index[i]];

  1027.     }

  1028. 

  1029.     /* calculate chroma MV vector from four luma MVs */

  1030.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  1031.     if(!idx) { // all blocks are inter

  1032.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1033.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1034.     } else if(count[idx] == 1) { // 3 inter blocks

  1035.         switch(idx) {

  1036.         case 0x1:

  1037.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1038.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1039.             break;

  1040.         case 0x2:

  1041.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1042.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1043.             break;

  1044.         case 0x4:

  1045.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1046.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1047.             break;

  1048.         case 0x8:

  1049.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1050.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1051.             break;

  1052.         }

  1053.     } else if(count[idx] == 2) {

  1054.         int t1 = 0, t2 = 0;

  1055.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1056.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1057.         tx = (mvx[t1] + mvx[t2]) / 2;

  1058.         ty = (mvy[t1] + mvy[t2]) / 2;

  1059.     } else

  1060.         return; //no need to do MC for inter blocks

  1061. 

  1062.     s->current_picture.motion_val[1][s->block_index[0]][0] = tx;

  1063.     s->current_picture.motion_val[1][s->block_index[0]][1] = ty;

  1064.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1065.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1066.     if(v->fastuvmc) {

  1067.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1068.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1069.     }

  1070. 

  1071.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1072.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1073. 

  1074.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  1075.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  1076.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1077.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1078.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1079.        || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  1080.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){

  1081.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1082.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1083.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1084.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1085.         srcU = s->edge_emu_buffer;

  1086.         srcV = s->edge_emu_buffer + 16;

  1087. 

  1088.         /* if we deal with range reduction we need to scale source blocks */

  1089.         if(v->rangeredfrm) {

  1090.             int i, j;

  1091.             uint8_t *src, *src2;

  1092. 

  1093.             src = srcU; src2 = srcV;

  1094.             for(j = 0; j < 9; j++) {

  1095.                 for(i = 0; i < 9; i++) {

  1096.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1097.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1098.                 }

  1099.                 src += s->uvlinesize;

  1100.                 src2 += s->uvlinesize;

  1101.             }

  1102.         }

  1103.         /* if we deal with intensity compensation we need to scale source blocks */

  1104.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1105.             int i, j;

  1106.             uint8_t *src, *src2;

  1107. 

  1108.             src = srcU; src2 = srcV;

  1109.             for(j = 0; j < 9; j++) {

  1110.                 for(i = 0; i < 9; i++) {

  1111.                     src[i] = v->lutuv[src[i]];

  1112.                     src2[i] = v->lutuv[src2[i]];

  1113.                 }

  1114.                 src += s->uvlinesize;

  1115.                 src2 += s->uvlinesize;

  1116.             }

  1117.         }

  1118.     }

  1119. 

  1120.     /* Chroma MC always uses qpel bilinear */

  1121.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1122.     uvmx = (uvmx&3)<<1;

  1123.     uvmy = (uvmy&3)<<1;

  1124.     if(!v->rnd){

  1125.         dsp->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1126.         dsp->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1127.     }else{

  1128.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1129.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1130.     }

  1131. }

  1132. 

  1133. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);

  1134. 

  1135. /**

  1136.  * Decode Simple/Main Profiles sequence header

  1137.  * @see Figure 7-8, p16-17

  1138.  * @param avctx Codec context

  1139.  * @param gb GetBit context initialized from Codec context extra_data

  1140.  * @return Status

  1141.  */

  1142. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1143. {

  1144.     VC1Context *v = avctx->priv_data;

  1145. 

  1146.     av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));

  1147.     v->profile = get_bits(gb, 2);

  1148.     if (v->profile == 2)

  1149.     {

  1150.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1151.         return -1;

  1152.     }

  1153. 

  1154.     if (v->profile == PROFILE_ADVANCED)

  1155.     {

  1156.         return decode_sequence_header_adv(v, gb);

  1157.     }

  1158.     else

  1159.     {

  1160.         v->res_sm = get_bits(gb, 2); //reserved

  1161.         if (v->res_sm)

  1162.         {

  1163.             av_log(avctx, AV_LOG_ERROR,

  1164.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1165.             return -1;

  1166.         }

  1167.     }

  1168. 

  1169.     // (fps-2)/4 (->30)

  1170.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1171.     // (bitrate-32kbps)/64kbps

  1172.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1173.     v->s.loop_filter = get_bits(gb, 1); //common

  1174.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1175.     {

  1176.         av_log(avctx, AV_LOG_ERROR,

  1177.                "LOOPFILTER shell not be enabled in simple profile\n");

  1178.     }

  1179. 

  1180.     v->res_x8 = get_bits(gb, 1); //reserved

  1181.     if (v->res_x8)

  1182.     {

  1183.         av_log(avctx, AV_LOG_ERROR,

  1184.                "1 for reserved RES_X8 is forbidden\n");

  1185.         //return -1;

  1186.     }

  1187.     v->multires = get_bits(gb, 1);

  1188.     v->res_fasttx = get_bits(gb, 1);

  1189.     if (!v->res_fasttx)

  1190.     {

  1191.         av_log(avctx, AV_LOG_ERROR,

  1192.                "0 for reserved RES_FASTTX is forbidden\n");

  1193.         //return -1;

  1194.     }

  1195. 

  1196.     v->fastuvmc =  get_bits(gb, 1); //common

  1197.     if (!v->profile && !v->fastuvmc)

  1198.     {

  1199.         av_log(avctx, AV_LOG_ERROR,

  1200.                "FASTUVMC unavailable in Simple Profile\n");

  1201.         return -1;

  1202.     }

  1203.     v->extended_mv =  get_bits(gb, 1); //common

  1204.     if (!v->profile && v->extended_mv)

  1205.     {

  1206.         av_log(avctx, AV_LOG_ERROR,

  1207.                "Extended MVs unavailable in Simple Profile\n");

  1208.         return -1;

  1209.     }

  1210.     v->dquant =  get_bits(gb, 2); //common

  1211.     v->vstransform =  get_bits(gb, 1); //common

  1212. 

  1213.     v->res_transtab = get_bits(gb, 1);

  1214.     if (v->res_transtab)

  1215.     {

  1216.         av_log(avctx, AV_LOG_ERROR,

  1217.                "1 for reserved RES_TRANSTAB is forbidden\n");

  1218.         return -1;

  1219.     }

  1220. 

  1221.     v->overlap = get_bits(gb, 1); //common

  1222. 

  1223.     v->s.resync_marker = get_bits(gb, 1);

  1224.     v->rangered = get_bits(gb, 1);

  1225.     if (v->rangered && v->profile == PROFILE_SIMPLE)

  1226.     {

  1227.         av_log(avctx, AV_LOG_INFO,

  1228.                "RANGERED should be set to 0 in simple profile\n");

  1229.     }

  1230. 

  1231.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1232.     v->quantizer_mode = get_bits(gb, 2); //common

  1233. 

  1234.     v->finterpflag = get_bits(gb, 1); //common

  1235.     v->res_rtm_flag = get_bits(gb, 1); //reserved

  1236.     if (!v->res_rtm_flag)

  1237.     {

  1238. //            av_log(avctx, AV_LOG_ERROR,

  1239. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  1240.         av_log(avctx, AV_LOG_ERROR,

  1241.                "Old WMV3 version detected, only I-frames will be decoded\n");

  1242.         //return -1;

  1243.     }

  1244.     av_log(avctx, AV_LOG_DEBUG,

  1245.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1246.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  1247.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1248.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1249.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1250.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1251.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1252.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1253.                );

  1254.     return 0;

  1255. }

  1256. 

  1257. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)

  1258. {

  1259.     v->res_rtm_flag = 1;

  1260.     v->level = get_bits(gb, 3);

  1261.     if(v->level >= 5)

  1262.     {

  1263.         av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1264.     }

  1265.     v->chromaformat = get_bits(gb, 2);

  1266.     if (v->chromaformat != 1)

  1267.     {

  1268.         av_log(v->s.avctx, AV_LOG_ERROR,

  1269.                "Only 4:2:0 chroma format supported\n");

  1270.         return -1;

  1271.     }

  1272. 

  1273.     // (fps-2)/4 (->30)

  1274.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1275.     // (bitrate-32kbps)/64kbps

  1276.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1277.     v->postprocflag = get_bits(gb, 1); //common

  1278. 

  1279.     v->s.avctx->coded_width = (get_bits(gb, 12) + 1) << 1;

  1280.     v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;

  1281.     v->broadcast = get_bits1(gb);

  1282.     v->interlace = get_bits1(gb);

  1283.     if(v->interlace){

  1284.         av_log(v->s.avctx, AV_LOG_ERROR, "Interlaced mode not supported (yet)\n");

  1285.         return -1;

  1286.     }

  1287.     v->tfcntrflag = get_bits1(gb);

  1288.     v->finterpflag = get_bits1(gb);

  1289.     get_bits1(gb); // reserved

  1290. 

  1291.     av_log(v->s.avctx, AV_LOG_DEBUG,

  1292.                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1293.                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"

  1294.                "TFCTRflag=%i, FINTERPflag=%i\n",

  1295.                v->level, v->frmrtq_postproc, v->bitrtq_postproc,

  1296.                v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,

  1297.                v->tfcntrflag, v->finterpflag

  1298.                );

  1299. 

  1300.     v->psf = get_bits1(gb);

  1301.     if(v->psf) { //PsF, 6.1.13

  1302.         av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");

  1303.         return -1;

  1304.     }

  1305.     if(get_bits1(gb)) { //Display Info - decoding is not affected by it

  1306.         int w, h, ar = 0;

  1307.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");

  1308.         v->s.avctx->width  = v->s.width  = w = get_bits(gb, 14) + 1;

  1309.         v->s.avctx->height = v->s.height = h = get_bits(gb, 14) + 1;

  1310.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);

  1311.         if(get_bits1(gb))

  1312.             ar = get_bits(gb, 4);

  1313.         if(ar && ar < 14){

  1314.             v->s.avctx->sample_aspect_ratio = vc1_pixel_aspect[ar];

  1315.         }else if(ar == 15){

  1316.             w = get_bits(gb, 8);

  1317.             h = get_bits(gb, 8);

  1318.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  1319.         }

  1320. 

  1321.         if(get_bits1(gb)){ //framerate stuff

  1322.             if(get_bits1(gb)) {

  1323.                 get_bits(gb, 16);

  1324.             } else {

  1325.                 get_bits(gb, 8);

  1326.                 get_bits(gb, 4);

  1327.             }

  1328.         }

  1329. 

  1330.         if(get_bits1(gb)){

  1331.             v->color_prim = get_bits(gb, 8);

  1332.             v->transfer_char = get_bits(gb, 8);

  1333.             v->matrix_coef = get_bits(gb, 8);

  1334.         }

  1335.     }

  1336. 

  1337.     v->hrd_param_flag = get_bits1(gb);

  1338.     if(v->hrd_param_flag) {

  1339.         int i;

  1340.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1341.         get_bits(gb, 4); //bitrate exponent

  1342.         get_bits(gb, 4); //buffer size exponent

  1343.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1344.             get_bits(gb, 16); //hrd_rate[n]

  1345.             get_bits(gb, 16); //hrd_buffer[n]

  1346.         }

  1347.     }

  1348.     return 0;

  1349. }

  1350. 

  1351. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1352. {

  1353.     VC1Context *v = avctx->priv_data;

  1354.     int i, blink, refdist;

  1355. 

  1356.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1357.     blink = get_bits1(gb); // broken link

  1358.     avctx->max_b_frames = 1 - get_bits1(gb); // 'closed entry' also signalize possible B-frames

  1359.     v->panscanflag = get_bits1(gb);

  1360.     refdist = get_bits1(gb); // refdist flag

  1361.     v->s.loop_filter = get_bits1(gb);

  1362.     v->fastuvmc = get_bits1(gb);

  1363.     v->extended_mv = get_bits1(gb);

  1364.     v->dquant = get_bits(gb, 2);

  1365.     v->vstransform = get_bits1(gb);

  1366.     v->overlap = get_bits1(gb);

  1367.     v->quantizer_mode = get_bits(gb, 2);

  1368. 

  1369.     if(v->hrd_param_flag){

  1370.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1371.             get_bits(gb, 8); //hrd_full[n]

  1372.         }

  1373.     }

  1374. 

  1375.     if(get_bits1(gb)){

  1376.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1377.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1378.     }

  1379.     if(v->extended_mv)

  1380.         v->extended_dmv = get_bits1(gb);

  1381.     if(get_bits1(gb)) {

  1382.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1383.         skip_bits(gb, 3); // Y range, ignored for now

  1384.     }

  1385.     if(get_bits1(gb)) {

  1386.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1387.         skip_bits(gb, 3); // UV range, ignored for now

  1388.     }

  1389. 

  1390.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1391.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1392.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1393.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1394.         blink, 1 - avctx->max_b_frames, v->panscanflag, refdist, v->s.loop_filter,

  1395.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1396. 

  1397.     return 0;

  1398. }

  1399. 

  1400. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1401. {

  1402.     int pqindex, lowquant, status;

  1403. 

  1404.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1405.     skip_bits(gb, 2); //framecnt unused

  1406.     v->rangeredfrm = 0;

  1407.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1408.     v->s.pict_type = get_bits(gb, 1);

  1409.     if (v->s.avctx->max_b_frames) {

  1410.         if (!v->s.pict_type) {

  1411.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1412.             else v->s.pict_type = B_TYPE;

  1413.         } else v->s.pict_type = P_TYPE;

  1414.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1415. 

  1416.     v->bi_type = 0;

  1417.     if(v->s.pict_type == B_TYPE) {

  1418.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1419.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1420.         if(v->bfraction == 0) {

  1421.             v->s.pict_type = BI_TYPE;

  1422.         }

  1423.     }

  1424.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1425.         get_bits(gb, 7); // skip buffer fullness

  1426. 

  1427.     /* calculate RND */

  1428.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1429.         v->rnd = 1;

  1430.     if(v->s.pict_type == P_TYPE)

  1431.         v->rnd ^= 1;

  1432. 

  1433.     /* Quantizer stuff */

  1434.     pqindex = get_bits(gb, 5);

  1435.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1436.         v->pq = pquant_table[0][pqindex];

  1437.     else

  1438.         v->pq = pquant_table[1][pqindex];

  1439. 

  1440.     v->pquantizer = 1;

  1441.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1442.         v->pquantizer = pqindex < 9;

  1443.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1444.         v->pquantizer = 0;

  1445.     v->pqindex = pqindex;

  1446.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1447.     else v->halfpq = 0;

  1448.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1449.         v->pquantizer = get_bits(gb, 1);

  1450.     v->dquantfrm = 0;

  1451.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1452.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1453.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1454.     v->range_x = 1 << (v->k_x - 1);

  1455.     v->range_y = 1 << (v->k_y - 1);

  1456.     if (v->profile == PROFILE_ADVANCED)

  1457.     {

  1458.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1459.     }

  1460.     else

  1461.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1462. 

  1463. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1464. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1465. 

  1466.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1467. 

  1468.     switch(v->s.pict_type) {

  1469.     case P_TYPE:

  1470.         if (v->pq < 5) v->tt_index = 0;

  1471.         else if(v->pq < 13) v->tt_index = 1;

  1472.         else v->tt_index = 2;

  1473. 

  1474.         lowquant = (v->pq > 12) ? 0 : 1;

  1475.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1476.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1477.         {

  1478.             int scale, shift, i;

  1479.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1480.             v->lumscale = get_bits(gb, 6);

  1481.             v->lumshift = get_bits(gb, 6);

  1482.             v->use_ic = 1;

  1483.             /* fill lookup tables for intensity compensation */

  1484.             if(!v->lumscale) {

  1485.                 scale = -64;

  1486.                 shift = (255 - v->lumshift * 2) << 6;

  1487.                 if(v->lumshift > 31)

  1488.                     shift += 128 << 6;

  1489.             } else {

  1490.                 scale = v->lumscale + 32;

  1491.                 if(v->lumshift > 31)

  1492.                     shift = (v->lumshift - 64) << 6;

  1493.                 else

  1494.                     shift = v->lumshift << 6;

  1495.             }

  1496.             for(i = 0; i < 256; i++) {

  1497.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1498.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1499.             }

  1500.         }

  1501.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1502.             v->s.quarter_sample = 0;

  1503.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1504.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1505.                 v->s.quarter_sample = 0;

  1506.             else

  1507.                 v->s.quarter_sample = 1;

  1508.         } else

  1509.             v->s.quarter_sample = 1;

  1510.         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));

  1511. 

  1512.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1513.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1514.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1515.         {

  1516.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1517.             if (status < 0) return -1;

  1518.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1519.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1520.         } else {

  1521.             v->mv_type_is_raw = 0;

  1522.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1523.         }

  1524.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1525.         if (status < 0) return -1;

  1526.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1527.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1528. 

  1529.         /* Hopefully this is correct for P frames */

  1530.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1531.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1532. 

  1533.         if (v->dquant)

  1534.         {

  1535.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1536.             vop_dquant_decoding(v);

  1537.         }

  1538. 

  1539.         v->ttfrm = 0; //FIXME Is that so ?

  1540.         if (v->vstransform)

  1541.         {

  1542.             v->ttmbf = get_bits(gb, 1);

  1543.             if (v->ttmbf)

  1544.             {

  1545.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1546.             }

  1547.         } else {

  1548.             v->ttmbf = 1;

  1549.             v->ttfrm = TT_8X8;

  1550.         }

  1551.         break;

  1552.     case B_TYPE:

  1553.         if (v->pq < 5) v->tt_index = 0;

  1554.         else if(v->pq < 13) v->tt_index = 1;

  1555.         else v->tt_index = 2;

  1556. 

  1557.         lowquant = (v->pq > 12) ? 0 : 1;

  1558.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1559.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1560.         v->s.mspel = v->s.quarter_sample;

  1561. 

  1562.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1563.         if (status < 0) return -1;

  1564.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1565.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1566.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1567.         if (status < 0) return -1;

  1568.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1569.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1570. 

  1571.         v->s.mv_table_index = get_bits(gb, 2);

  1572.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1573. 

  1574.         if (v->dquant)

  1575.         {

  1576.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1577.             vop_dquant_decoding(v);

  1578.         }

  1579. 

  1580.         v->ttfrm = 0;

  1581.         if (v->vstransform)

  1582.         {

  1583.             v->ttmbf = get_bits(gb, 1);

  1584.             if (v->ttmbf)

  1585.             {

  1586.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1587.             }

  1588.         } else {

  1589.             v->ttmbf = 1;

  1590.             v->ttfrm = TT_8X8;

  1591.         }

  1592.         break;

  1593.     }

  1594. 

  1595.     /* AC Syntax */

  1596.     v->c_ac_table_index = decode012(gb);

  1597.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1598.     {

  1599.         v->y_ac_table_index = decode012(gb);

  1600.     }

  1601.     /* DC Syntax */

  1602.     v->s.dc_table_index = get_bits(gb, 1);

  1603. 

  1604.     if(v->s.pict_type == BI_TYPE) {

  1605.         v->s.pict_type = B_TYPE;

  1606.         v->bi_type = 1;

  1607.     }

  1608.     return 0;

  1609. }

  1610. 

  1611. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1612. {

  1613.     int fcm;

  1614.     int pqindex, lowquant;

  1615.     int status;

  1616. 

  1617.     v->p_frame_skipped = 0;

  1618. 

  1619.     if(v->interlace)

  1620.         fcm = decode012(gb);

  1621.     switch(get_prefix(gb, 0, 4)) {

  1622.     case 0:

  1623.         v->s.pict_type = P_TYPE;

  1624.         break;

  1625.     case 1:

  1626.         v->s.pict_type = B_TYPE;

  1627.         break;

  1628.     case 2:

  1629.         v->s.pict_type = I_TYPE;

  1630.         break;

  1631.     case 3:

  1632.         v->s.pict_type = BI_TYPE;

  1633.         break;

  1634.     case 4:

  1635.         v->s.pict_type = P_TYPE; // skipped pic

  1636.         v->p_frame_skipped = 1;

  1637.         return 0;

  1638.     }

  1639.     if(v->tfcntrflag)

  1640.         get_bits(gb, 8);

  1641.     if(v->broadcast) {

  1642.         if(!v->interlace || v->panscanflag) {

  1643.             get_bits(gb, 2);

  1644.         } else {

  1645.             get_bits1(gb);

  1646.             get_bits1(gb);

  1647.         }

  1648.     }

  1649.     if(v->panscanflag) {

  1650.         //...

  1651.     }

  1652.     v->rnd = get_bits1(gb);

  1653.     if(v->interlace)

  1654.         v->uvsamp = get_bits1(gb);

  1655.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1656.     if(v->s.pict_type == B_TYPE) {

  1657.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1658.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1659.         if(v->bfraction == 0) {

  1660.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1661.         }

  1662.     }

  1663.     pqindex = get_bits(gb, 5);

  1664.     v->pqindex = pqindex;

  1665.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1666.         v->pq = pquant_table[0][pqindex];

  1667.     else

  1668.         v->pq = pquant_table[1][pqindex];

  1669. 

  1670.     v->pquantizer = 1;

  1671.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1672.         v->pquantizer = pqindex < 9;

  1673.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1674.         v->pquantizer = 0;

  1675.     v->pqindex = pqindex;

  1676.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1677.     else v->halfpq = 0;

  1678.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1679.         v->pquantizer = get_bits(gb, 1);

  1680. 

  1681.     switch(v->s.pict_type) {

  1682.     case I_TYPE:

  1683.     case BI_TYPE:

  1684.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1685.         if (status < 0) return -1;

  1686.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1687.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1688.         v->condover = CONDOVER_NONE;

  1689.         if(v->overlap && v->pq <= 8) {

  1690.             v->condover = decode012(gb);

  1691.             if(v->condover == CONDOVER_SELECT) {

  1692.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1693.                 if (status < 0) return -1;

  1694.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1695.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1696.             }

  1697.         }

  1698.         break;

  1699.     case P_TYPE:

  1700.         if(v->postprocflag)

  1701.             v->postproc = get_bits1(gb);

  1702.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1703.         else v->mvrange = 0;

  1704.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1705.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1706.         v->range_x = 1 << (v->k_x - 1);

  1707.         v->range_y = 1 << (v->k_y - 1);

  1708. 

  1709.         if (v->pq < 5) v->tt_index = 0;

  1710.         else if(v->pq < 13) v->tt_index = 1;

  1711.         else v->tt_index = 2;

  1712. 

  1713.         lowquant = (v->pq > 12) ? 0 : 1;

  1714.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1715.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1716.         {

  1717.             int scale, shift, i;

  1718.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1719.             v->lumscale = get_bits(gb, 6);

  1720.             v->lumshift = get_bits(gb, 6);

  1721.             /* fill lookup tables for intensity compensation */

  1722.             if(!v->lumscale) {

  1723.                 scale = -64;

  1724.                 shift = (255 - v->lumshift * 2) << 6;

  1725.                 if(v->lumshift > 31)

  1726.                     shift += 128 << 6;

  1727.             } else {

  1728.                 scale = v->lumscale + 32;

  1729.                 if(v->lumshift > 31)

  1730.                     shift = (v->lumshift - 64) << 6;

  1731.                 else

  1732.                     shift = v->lumshift << 6;

  1733.             }

  1734.             for(i = 0; i < 256; i++) {

  1735.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1736.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1737.             }

  1738.         }

  1739.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1740.             v->s.quarter_sample = 0;

  1741.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1742.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1743.                 v->s.quarter_sample = 0;

  1744.             else

  1745.                 v->s.quarter_sample = 1;

  1746.         } else

  1747.             v->s.quarter_sample = 1;

  1748.         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));

  1749. 

  1750.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1751.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1752.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1753.         {

  1754.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1755.             if (status < 0) return -1;

  1756.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1757.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1758.         } else {

  1759.             v->mv_type_is_raw = 0;

  1760.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1761.         }

  1762.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1763.         if (status < 0) return -1;

  1764.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1765.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1766. 

  1767.         /* Hopefully this is correct for P frames */

  1768.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1769.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1770.         if (v->dquant)

  1771.         {

  1772.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1773.             vop_dquant_decoding(v);

  1774.         }

  1775. 

  1776.         v->ttfrm = 0; //FIXME Is that so ?

  1777.         if (v->vstransform)

  1778.         {

  1779.             v->ttmbf = get_bits(gb, 1);

  1780.             if (v->ttmbf)

  1781.             {

  1782.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1783.             }

  1784.         } else {

  1785.             v->ttmbf = 1;

  1786.             v->ttfrm = TT_8X8;

  1787.         }

  1788.         break;

  1789.     case B_TYPE:

  1790.         if(v->postprocflag)

  1791.             v->postproc = get_bits1(gb);

  1792.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1793.         else v->mvrange = 0;

  1794.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1795.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1796.         v->range_x = 1 << (v->k_x - 1);

  1797.         v->range_y = 1 << (v->k_y - 1);

  1798. 

  1799.         if (v->pq < 5) v->tt_index = 0;

  1800.         else if(v->pq < 13) v->tt_index = 1;

  1801.         else v->tt_index = 2;

  1802. 

  1803.         lowquant = (v->pq > 12) ? 0 : 1;

  1804.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1805.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1806.         v->s.mspel = v->s.quarter_sample;

  1807. 

  1808.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1809.         if (status < 0) return -1;

  1810.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1811.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1812.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1813.         if (status < 0) return -1;

  1814.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1815.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1816. 

  1817.         v->s.mv_table_index = get_bits(gb, 2);

  1818.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1819. 

  1820.         if (v->dquant)

  1821.         {

  1822.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1823.             vop_dquant_decoding(v);

  1824.         }

  1825. 

  1826.         v->ttfrm = 0;

  1827.         if (v->vstransform)

  1828.         {

  1829.             v->ttmbf = get_bits(gb, 1);

  1830.             if (v->ttmbf)

  1831.             {

  1832.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1833.             }

  1834.         } else {

  1835.             v->ttmbf = 1;

  1836.             v->ttfrm = TT_8X8;

  1837.         }

  1838.         break;

  1839.     }

  1840. 

  1841.     /* AC Syntax */

  1842.     v->c_ac_table_index = decode012(gb);

  1843.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1844.     {

  1845.         v->y_ac_table_index = decode012(gb);

  1846.     }

  1847.     /* DC Syntax */

  1848.     v->s.dc_table_index = get_bits(gb, 1);

  1849.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1850.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1851.         vop_dquant_decoding(v);

  1852.     }

  1853. 

  1854.     v->bi_type = 0;

  1855.     if(v->s.pict_type == BI_TYPE) {

  1856.         v->s.pict_type = B_TYPE;

  1857.         v->bi_type = 1;

  1858.     }

  1859.     return 0;

  1860. }

  1861. 

  1862. /***********************************************************************/

  1863. /**

  1864.  * @defgroup block VC-1 Block-level functions

  1865.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1866.  * @{

  1867.  */

  1868. 

  1869. /**

  1870.  * @def GET_MQUANT

  1871.  * @brief Get macroblock-level quantizer scale

  1872.  */

  1873. #define GET_MQUANT()                                           \

  1874.   if (v->dquantfrm)                                            \

  1875.   {                                                            \

  1876.     int edges = 0;                                             \

  1877.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1878.     {                                                          \

  1879.       if (v->dqbilevel)                                        \

  1880.       {                                                        \

  1881.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1882.       }                                                        \

  1883.       else                                                     \

  1884.       {                                                        \

  1885.         mqdiff = get_bits(gb, 3);                              \

  1886.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1887.         else mquant = get_bits(gb, 5);                         \

  1888.       }                                                        \

  1889.     }                                                          \

  1890.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1891.         edges = 1 << v->dqsbedge;                              \

  1892.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1893.         edges = (3 << v->dqsbedge) % 15;                       \

  1894.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1895.         edges = 15;                                            \

  1896.     if((edges&1) && !s->mb_x)                                  \

  1897.         mquant = v->altpq;                                     \

  1898.     if((edges&2) && s->first_slice_line)                       \

  1899.         mquant = v->altpq;                                     \

  1900.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1901.         mquant = v->altpq;                                     \

  1902.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1903.         mquant = v->altpq;                                     \

  1904.   }

  1905. 

  1906. /**

  1907.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1908.  * @brief Get MV differentials

  1909.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1910.  * @param _dmv_x Horizontal differential for decoded MV

  1911.  * @param _dmv_y Vertical differential for decoded MV

  1912.  */

  1913. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1914.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1915.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1916.   if (index > 36)                                                   \

  1917.   {                                                                 \

  1918.     mb_has_coeffs = 1;                                              \

  1919.     index -= 37;                                                    \

  1920.   }                                                                 \

  1921.   else mb_has_coeffs = 0;                                           \

  1922.   s->mb_intra = 0;                                                  \

  1923.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1924.   else if (index == 35)                                             \

  1925.   {                                                                 \

  1926.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1927.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1928.   }                                                                 \

  1929.   else if (index == 36)                                             \

  1930.   {                                                                 \

  1931.     _dmv_x = 0;                                                     \

  1932.     _dmv_y = 0;                                                     \

  1933.     s->mb_intra = 1;                                                \

  1934.   }                                                                 \

  1935.   else                                                              \

  1936.   {                                                                 \

  1937.     index1 = index%6;                                               \

  1938.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1939.     else                                   val = 0;                 \

  1940.     if(size_table[index1] - val > 0)                                \

  1941.         val = get_bits(gb, size_table[index1] - val);               \

  1942.     else                                   val = 0;                 \

  1943.     sign = 0 - (val&1);                                             \

  1944.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1945.                                                                     \

  1946.     index1 = index/6;                                               \

  1947.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1948.     else                                   val = 0;                 \

  1949.     if(size_table[index1] - val > 0)                                \

  1950.         val = get_bits(gb, size_table[index1] - val);               \

  1951.     else                                   val = 0;                 \

  1952.     sign = 0 - (val&1);                                             \

  1953.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1954.   }

  1955. 

  1956. /** Predict and set motion vector

  1957.  */

  1958. 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)

  1959. {

  1960.     int xy, wrap, off = 0;

  1961.     int16_t *A, *B, *C;

  1962.     int px, py;

  1963.     int sum;

  1964. 

  1965.     /* scale MV difference to be quad-pel */

  1966.     dmv_x <<= 1 - s->quarter_sample;

  1967.     dmv_y <<= 1 - s->quarter_sample;

  1968. 

  1969.     wrap = s->b8_stride;

  1970.     xy = s->block_index[n];

  1971. 

  1972.     if(s->mb_intra){

  1973.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1974.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1975.         if(mv1) { /* duplicate motion data for 1-MV block */

  1976.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1977.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1978.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1979.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1980.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1981.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1982.         }

  1983.         return;

  1984.     }

  1985. 

  1986.     C = s->current_picture.motion_val[0][xy - 1];

  1987.     A = s->current_picture.motion_val[0][xy - wrap];

  1988.     if(mv1)

  1989.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1990.     else {

  1991.         //in 4-MV mode different blocks have different B predictor position

  1992.         switch(n){

  1993.         case 0:

  1994.             off = (s->mb_x > 0) ? -1 : 1;

  1995.             break;

  1996.         case 1:

  1997.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1998.             break;

  1999.         case 2:

  2000.             off = 1;

  2001.             break;

  2002.         case 3:

  2003.             off = -1;

  2004.         }

  2005.     }

  2006.     B = s->current_picture.motion_val[0][xy - wrap + off];

  2007. 

  2008.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  2009.         if(s->mb_width == 1) {

  2010.             px = A[0];

  2011.             py = A[1];

  2012.         } else {

  2013.             px = mid_pred(A[0], B[0], C[0]);

  2014.             py = mid_pred(A[1], B[1], C[1]);

  2015.         }

  2016.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  2017.         px = C[0];

  2018.         py = C[1];

  2019.     } else {

  2020.         px = py = 0;

  2021.     }

  2022.     /* Pullback MV as specified in 8.3.5.3.4 */

  2023.     {

  2024.         int qx, qy, X, Y;

  2025.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  2026.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  2027.         X = (s->mb_width << 6) - 4;

  2028.         Y = (s->mb_height << 6) - 4;

  2029.         if(mv1) {

  2030.             if(qx + px < -60) px = -60 - qx;

  2031.             if(qy + py < -60) py = -60 - qy;

  2032.         } else {

  2033.             if(qx + px < -28) px = -28 - qx;

  2034.             if(qy + py < -28) py = -28 - qy;

  2035.         }

  2036.         if(qx + px > X) px = X - qx;

  2037.         if(qy + py > Y) py = Y - qy;

  2038.     }

  2039.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2040.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  2041.         if(is_intra[xy - wrap])

  2042.             sum = FFABS(px) + FFABS(py);

  2043.         else

  2044.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2045.         if(sum > 32) {

  2046.             if(get_bits1(&s->gb)) {

  2047.                 px = A[0];

  2048.                 py = A[1];

  2049.             } else {

  2050.                 px = C[0];

  2051.                 py = C[1];

  2052.             }

  2053.         } else {

  2054.             if(is_intra[xy - 1])

  2055.                 sum = FFABS(px) + FFABS(py);

  2056.             else

  2057.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2058.             if(sum > 32) {

  2059.                 if(get_bits1(&s->gb)) {

  2060.                     px = A[0];

  2061.                     py = A[1];

  2062.                 } else {

  2063.                     px = C[0];

  2064.                     py = C[1];

  2065.                 }

  2066.             }

  2067.         }

  2068.     }

  2069.     /* store MV using signed modulus of MV range defined in 4.11 */

  2070.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  2071.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  2072.     if(mv1) { /* duplicate motion data for 1-MV block */

  2073.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  2074.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  2075.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  2076.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  2077.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  2078.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  2079.     }

  2080. }

  2081. 

  2082. /** Motion compensation for direct or interpolated blocks in B-frames

  2083.  */

  2084. static void vc1_interp_mc(VC1Context *v)

  2085. {

  2086.     MpegEncContext *s = &v->s;

  2087.     DSPContext *dsp = &v->s.dsp;

  2088.     uint8_t *srcY, *srcU, *srcV;

  2089.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  2090. 

  2091.     if(!v->s.next_picture.data[0])return;

  2092. 

  2093.     mx = s->mv[1][0][0];

  2094.     my = s->mv[1][0][1];

  2095.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  2096.     uvmy = (my + ((my & 3) == 3)) >> 1;

  2097.     if(v->fastuvmc) {

  2098.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  2099.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  2100.     }

  2101.     srcY = s->next_picture.data[0];

  2102.     srcU = s->next_picture.data[1];

  2103.     srcV = s->next_picture.data[2];

  2104. 

  2105.     src_x = s->mb_x * 16 + (mx >> 2);

  2106.     src_y = s->mb_y * 16 + (my >> 2);

  2107.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  2108.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  2109. 

  2110.     src_x   = clip(  src_x, -16, s->mb_width  * 16);

  2111.     src_y   = clip(  src_y, -16, s->mb_height * 16);

  2112.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  2113.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  2114. 

  2115.     srcY += src_y * s->linesize + src_x;

  2116.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  2117.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  2118. 

  2119.     /* for grayscale we should not try to read from unknown area */

  2120.     if(s->flags & CODEC_FLAG_GRAY) {

  2121.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  2122.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  2123.     }

  2124. 

  2125.     if(v->rangeredfrm

  2126.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  2127.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  2128.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  2129. 

  2130.         srcY -= s->mspel * (1 + s->linesize);

  2131.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  2132.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  2133.         srcY = s->edge_emu_buffer;

  2134.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  2135.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2136.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  2137.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2138.         srcU = uvbuf;

  2139.         srcV = uvbuf + 16;

  2140.         /* if we deal with range reduction we need to scale source blocks */

  2141.         if(v->rangeredfrm) {

  2142.             int i, j;

  2143.             uint8_t *src, *src2;

  2144. 

  2145.             src = srcY;

  2146.             for(j = 0; j < 17 + s->mspel*2; j++) {

  2147.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  2148.                 src += s->linesize;

  2149.             }

  2150.             src = srcU; src2 = srcV;

  2151.             for(j = 0; j < 9; j++) {

  2152.                 for(i = 0; i < 9; i++) {

  2153.                     src[i] = ((src[i] - 128) >> 1) + 128;

  2154.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  2155.                 }

  2156.                 src += s->uvlinesize;

  2157.                 src2 += s->uvlinesize;

  2158.             }

  2159.         }

  2160.         srcY += s->mspel * (1 + s->linesize);

  2161.     }

  2162. 

  2163.     mx >>= 1;

  2164.     my >>= 1;

  2165.     dxy = ((my & 1) << 1) | (mx & 1);

  2166. 

  2167.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  2168. 

  2169.     if(s->flags & CODEC_FLAG_GRAY) return;

  2170.     /* Chroma MC always uses qpel blilinear */

  2171.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  2172.     uvmx = (uvmx&3)<<1;

  2173.     uvmy = (uvmy&3)<<1;

  2174.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  2175.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  2176. }

  2177. 

  2178. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  2179. {

  2180.     int n = bfrac;

  2181. 

  2182. #if B_FRACTION_DEN==256

  2183.     if(inv)

  2184.         n -= 256;

  2185.     if(!qs)

  2186.         return 2 * ((value * n + 255) >> 9);

  2187.     return (value * n + 128) >> 8;

  2188. #else

  2189.     if(inv)

  2190.         n -= B_FRACTION_DEN;

  2191.     if(!qs)

  2192.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2193.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2194. #endif

  2195. }

  2196. 

  2197. /** Reconstruct motion vector for B-frame and do motion compensation

  2198.  */

  2199. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  2200. {

  2201.     if(v->use_ic) {

  2202.         v->mv_mode2 = v->mv_mode;

  2203.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  2204.     }

  2205.     if(direct) {

  2206.         vc1_mc_1mv(v, 0);

  2207.         vc1_interp_mc(v);

  2208.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2209.         return;

  2210.     }

  2211.     if(mode == BMV_TYPE_INTERPOLATED) {

  2212.         vc1_mc_1mv(v, 0);

  2213.         vc1_interp_mc(v);

  2214.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2215.         return;

  2216.     }

  2217. 

  2218.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  2219.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2220.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  2221. }

  2222. 

  2223. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  2224. {

  2225.     MpegEncContext *s = &v->s;

  2226.     int xy, wrap, off = 0;

  2227.     int16_t *A, *B, *C;

  2228.     int px, py;

  2229.     int sum;

  2230.     int r_x, r_y;

  2231.     const uint8_t *is_intra = v->mb_type[0];

  2232. 

  2233.     r_x = v->range_x;

  2234.     r_y = v->range_y;

  2235.     /* scale MV difference to be quad-pel */

  2236.     dmv_x[0] <<= 1 - s->quarter_sample;

  2237.     dmv_y[0] <<= 1 - s->quarter_sample;

  2238.     dmv_x[1] <<= 1 - s->quarter_sample;

  2239.     dmv_y[1] <<= 1 - s->quarter_sample;

  2240. 

  2241.     wrap = s->b8_stride;

  2242.     xy = s->block_index[0];

  2243. 

  2244.     if(s->mb_intra) {

  2245.         s->current_picture.motion_val[0][xy][0] =

  2246.         s->current_picture.motion_val[0][xy][1] =

  2247.         s->current_picture.motion_val[1][xy][0] =

  2248.         s->current_picture.motion_val[1][xy][1] = 0;

  2249.         return;

  2250.     }

  2251.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2252.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2253.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2254.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2255.     if(direct) {

  2256.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2257.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2258.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2259.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2260.         return;

  2261.     }

  2262. 

  2263.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2264.         C = s->current_picture.motion_val[0][xy - 2];

  2265.         A = s->current_picture.motion_val[0][xy - wrap*2];

  2266.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2267.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  2268. 

  2269.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2270.             if(s->mb_width == 1) {

  2271.                 px = A[0];

  2272.                 py = A[1];

  2273.             } else {

  2274.                 px = mid_pred(A[0], B[0], C[0]);

  2275.                 py = mid_pred(A[1], B[1], C[1]);

  2276.             }

  2277.         } else if(s->mb_x) { // predictor C is not out of bounds

  2278.             px = C[0];

  2279.             py = C[1];

  2280.         } else {

  2281.             px = py = 0;

  2282.         }

  2283.         /* Pullback MV as specified in 8.3.5.3.4 */

  2284.         {

  2285.             int qx, qy, X, Y;

  2286.             if(v->profile < PROFILE_ADVANCED) {

  2287.                 qx = (s->mb_x << 5);

  2288.                 qy = (s->mb_y << 5);

  2289.                 X = (s->mb_width << 5) - 4;

  2290.                 Y = (s->mb_height << 5) - 4;

  2291.                 if(qx + px < -28) px = -28 - qx;

  2292.                 if(qy + py < -28) py = -28 - qy;

  2293.                 if(qx + px > X) px = X - qx;

  2294.                 if(qy + py > Y) py = Y - qy;

  2295.             } else {

  2296.                 qx = (s->mb_x << 6);

  2297.                 qy = (s->mb_y << 6);

  2298.                 X = (s->mb_width << 6) - 4;

  2299.                 Y = (s->mb_height << 6) - 4;

  2300.                 if(qx + px < -60) px = -60 - qx;

  2301.                 if(qy + py < -60) py = -60 - qy;

  2302.                 if(qx + px > X) px = X - qx;

  2303.                 if(qy + py > Y) py = Y - qy;

  2304.             }

  2305.         }

  2306.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2307.         if(0 && !s->first_slice_line && s->mb_x) {

  2308.             if(is_intra[xy - wrap])

  2309.                 sum = FFABS(px) + FFABS(py);

  2310.             else

  2311.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2312.             if(sum > 32) {

  2313.                 if(get_bits1(&s->gb)) {

  2314.                     px = A[0];

  2315.                     py = A[1];

  2316.                 } else {

  2317.                     px = C[0];

  2318.                     py = C[1];

  2319.                 }

  2320.             } else {

  2321.                 if(is_intra[xy - 2])

  2322.                     sum = FFABS(px) + FFABS(py);

  2323.                 else

  2324.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2325.                 if(sum > 32) {

  2326.                     if(get_bits1(&s->gb)) {

  2327.                         px = A[0];

  2328.                         py = A[1];

  2329.                     } else {

  2330.                         px = C[0];

  2331.                         py = C[1];

  2332.                     }

  2333.                 }

  2334.             }

  2335.         }

  2336.         /* store MV using signed modulus of MV range defined in 4.11 */

  2337.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2338.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2339.     }

  2340.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2341.         C = s->current_picture.motion_val[1][xy - 2];

  2342.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2343.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2344.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2345. 

  2346.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2347.             if(s->mb_width == 1) {

  2348.                 px = A[0];

  2349.                 py = A[1];

  2350.             } else {

  2351.                 px = mid_pred(A[0], B[0], C[0]);

  2352.                 py = mid_pred(A[1], B[1], C[1]);

  2353.             }

  2354.         } else if(s->mb_x) { // predictor C is not out of bounds

  2355.             px = C[0];

  2356.             py = C[1];

  2357.         } else {

  2358.             px = py = 0;

  2359.         }

  2360.         /* Pullback MV as specified in 8.3.5.3.4 */

  2361.         {

  2362.             int qx, qy, X, Y;

  2363.             if(v->profile < PROFILE_ADVANCED) {

  2364.                 qx = (s->mb_x << 5);

  2365.                 qy = (s->mb_y << 5);

  2366.                 X = (s->mb_width << 5) - 4;

  2367.                 Y = (s->mb_height << 5) - 4;

  2368.                 if(qx + px < -28) px = -28 - qx;

  2369.                 if(qy + py < -28) py = -28 - qy;

  2370.                 if(qx + px > X) px = X - qx;

  2371.                 if(qy + py > Y) py = Y - qy;

  2372.             } else {

  2373.                 qx = (s->mb_x << 6);

  2374.                 qy = (s->mb_y << 6);

  2375.                 X = (s->mb_width << 6) - 4;

  2376.                 Y = (s->mb_height << 6) - 4;

  2377.                 if(qx + px < -60) px = -60 - qx;

  2378.                 if(qy + py < -60) py = -60 - qy;

  2379.                 if(qx + px > X) px = X - qx;

  2380.                 if(qy + py > Y) py = Y - qy;

  2381.             }

  2382.         }

  2383.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2384.         if(0 && !s->first_slice_line && s->mb_x) {

  2385.             if(is_intra[xy - wrap])

  2386.                 sum = FFABS(px) + FFABS(py);

  2387.             else

  2388.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2389.             if(sum > 32) {

  2390.                 if(get_bits1(&s->gb)) {

  2391.                     px = A[0];

  2392.                     py = A[1];

  2393.                 } else {

  2394.                     px = C[0];

  2395.                     py = C[1];

  2396.                 }

  2397.             } else {

  2398.                 if(is_intra[xy - 2])

  2399.                     sum = FFABS(px) + FFABS(py);

  2400.                 else

  2401.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2402.                 if(sum > 32) {

  2403.                     if(get_bits1(&s->gb)) {

  2404.                         px = A[0];

  2405.                         py = A[1];

  2406.                     } else {

  2407.                         px = C[0];

  2408.                         py = C[1];

  2409.                     }

  2410.                 }

  2411.             }

  2412.         }

  2413.         /* store MV using signed modulus of MV range defined in 4.11 */

  2414. 

  2415.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2416.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2417.     }

  2418.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2419.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2420.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2421.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2422. }

  2423. 

  2424. /** Get predicted DC value for I-frames only

  2425.  * prediction dir: left=0, top=1

  2426.  * @param s MpegEncContext

  2427.  * @param[in] n block index in the current MB

  2428.  * @param dc_val_ptr Pointer to DC predictor

  2429.  * @param dir_ptr Prediction direction for use in AC prediction

  2430.  */

  2431. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2432.                               int16_t **dc_val_ptr, int *dir_ptr)

  2433. {

  2434.     int a, b, c, wrap, pred, scale;

  2435.     int16_t *dc_val;

  2436.     static const uint16_t dcpred[32] = {

  2437.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2438.          114,  102,   93,   85,   79,   73,   68,   64,

  2439.           60,   57,   54,   51,   49,   47,   45,   43,

  2440.           41,   39,   38,   37,   35,   34,   33

  2441.     };

  2442. 

  2443.     /* find prediction - wmv3_dc_scale always used here in fact */

  2444.     if (n < 4)     scale = s->y_dc_scale;

  2445.     else           scale = s->c_dc_scale;

  2446. 

  2447.     wrap = s->block_wrap[n];

  2448.     dc_val= s->dc_val[0] + s->block_index[n];

  2449. 

  2450.     /* B A

  2451.      * C X

  2452.      */

  2453.     c = dc_val[ - 1];

  2454.     b = dc_val[ - 1 - wrap];

  2455.     a = dc_val[ - wrap];

  2456. 

  2457.     if (pq < 9 || !overlap)

  2458.     {

  2459.         /* Set outer values */

  2460.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2461.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2462.     }

  2463.     else

  2464.     {

  2465.         /* Set outer values */

  2466.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2467.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2468.     }

  2469. 

  2470.     if (abs(a - b) <= abs(b - c)) {

  2471.         pred = c;

  2472.         *dir_ptr = 1;//left

  2473.     } else {

  2474.         pred = a;

  2475.         *dir_ptr = 0;//top

  2476.     }

  2477. 

  2478.     /* update predictor */

  2479.     *dc_val_ptr = &dc_val[0];

  2480.     return pred;

  2481. }

  2482. 

  2483. 

  2484. /** Get predicted DC value

  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_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2492.                               int a_avail, int c_avail,

  2493.                               int16_t **dc_val_ptr, int *dir_ptr)

  2494. {

  2495.     int a, b, c, wrap, pred, scale;

  2496.     int16_t *dc_val;

  2497.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2498.     int q1, q2 = 0;

  2499. 

  2500.     /* find prediction - wmv3_dc_scale always used here in fact */

  2501.     if (n < 4)     scale = s->y_dc_scale;

  2502.     else           scale = s->c_dc_scale;

  2503. 

  2504.     wrap = s->block_wrap[n];

  2505.     dc_val= s->dc_val[0] + s->block_index[n];

  2506. 

  2507.     /* B A

  2508.      * C X

  2509.      */

  2510.     c = dc_val[ - 1];

  2511.     b = dc_val[ - 1 - wrap];

  2512.     a = dc_val[ - wrap];

  2513.     /* scale predictors if needed */

  2514.     q1 = s->current_picture.qscale_table[mb_pos];

  2515.     if(c_avail && (n!= 1 && n!=3)) {

  2516.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2517.         if(q2 && q2 != q1)

  2518.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2519.     }

  2520.     if(a_avail && (n!= 2 && n!=3)) {

  2521.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2522.         if(q2 && q2 != q1)

  2523.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2524.     }

  2525.     if(a_avail && c_avail && (n!=3)) {

  2526.         int off = mb_pos;

  2527.         if(n != 1) off--;

  2528.         if(n != 2) off -= s->mb_stride;

  2529.         q2 = s->current_picture.qscale_table[off];

  2530.         if(q2 && q2 != q1)

  2531.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2532.     }

  2533. 

  2534.     if(a_avail && c_avail) {

  2535.         if(abs(a - b) <= abs(b - c)) {

  2536.             pred = c;

  2537.             *dir_ptr = 1;//left

  2538.         } else {

  2539.             pred = a;

  2540.             *dir_ptr = 0;//top

  2541.         }

  2542.     } else if(a_avail) {

  2543.         pred = a;

  2544.         *dir_ptr = 0;//top

  2545.     } else if(c_avail) {

  2546.         pred = c;

  2547.         *dir_ptr = 1;//left

  2548.     } else {

  2549.         pred = 0;

  2550.         *dir_ptr = 1;//left

  2551.     }

  2552. 

  2553.     /* update predictor */

  2554.     *dc_val_ptr = &dc_val[0];

  2555.     return pred;

  2556. }

  2557. 

  2558. 

  2559. /**

  2560.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2561.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2562.  * @{

  2563.  */

  2564. 

  2565. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2566. {

  2567.     int xy, wrap, pred, a, b, c;

  2568. 

  2569.     xy = s->block_index[n];

  2570.     wrap = s->b8_stride;

  2571. 

  2572.     /* B C

  2573.      * A X

  2574.      */

  2575.     a = s->coded_block[xy - 1       ];

  2576.     b = s->coded_block[xy - 1 - wrap];

  2577.     c = s->coded_block[xy     - wrap];

  2578. 

  2579.     if (b == c) {

  2580.         pred = a;

  2581.     } else {

  2582.         pred = c;

  2583.     }

  2584. 

  2585.     /* store value */

  2586.     *coded_block_ptr = &s->coded_block[xy];

  2587. 

  2588.     return pred;

  2589. }

  2590. 

  2591. /**

  2592.  * Decode one AC coefficient

  2593.  * @param v The VC1 context

  2594.  * @param last Last coefficient

  2595.  * @param skip How much zero coefficients to skip

  2596.  * @param value Decoded AC coefficient value

  2597.  * @see 8.1.3.4

  2598.  */

  2599. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2600. {

  2601.     GetBitContext *gb = &v->s.gb;

  2602.     int index, escape, run = 0, level = 0, lst = 0;

  2603. 

  2604.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2605.     if (index != vc1_ac_sizes[codingset] - 1) {

  2606.         run = vc1_index_decode_table[codingset][index][0];

  2607.         level = vc1_index_decode_table[codingset][index][1];

  2608.         lst = index >= vc1_last_decode_table[codingset];

  2609.         if(get_bits(gb, 1))

  2610.             level = -level;

  2611.     } else {

  2612.         escape = decode210(gb);

  2613.         if (escape != 2) {

  2614.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2615.             run = vc1_index_decode_table[codingset][index][0];

  2616.             level = vc1_index_decode_table[codingset][index][1];

  2617.             lst = index >= vc1_last_decode_table[codingset];

  2618.             if(escape == 0) {

  2619.                 if(lst)

  2620.                     level += vc1_last_delta_level_table[codingset][run];

  2621.                 else

  2622.                     level += vc1_delta_level_table[codingset][run];

  2623.             } else {

  2624.                 if(lst)

  2625.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2626.                 else

  2627.                     run += vc1_delta_run_table[codingset][level] + 1;

  2628.             }

  2629.             if(get_bits(gb, 1))

  2630.                 level = -level;

  2631.         } else {

  2632.             int sign;

  2633.             lst = get_bits(gb, 1);

  2634.             if(v->s.esc3_level_length == 0) {

  2635.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2636.                     v->s.esc3_level_length = get_bits(gb, 3);

  2637.                     if(!v->s.esc3_level_length)

  2638.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2639.                 } else { //table 60

  2640.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2641.                 }

  2642.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2643.             }

  2644.             run = get_bits(gb, v->s.esc3_run_length);

  2645.             sign = get_bits(gb, 1);

  2646.             level = get_bits(gb, v->s.esc3_level_length);

  2647.             if(sign)

  2648.                 level = -level;

  2649.         }

  2650.     }

  2651. 

  2652.     *last = lst;

  2653.     *skip = run;

  2654.     *value = level;

  2655. }

  2656. 

  2657. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2658.  * @param v VC1Context

  2659.  * @param block block to decode

  2660.  * @param coded are AC coeffs present or not

  2661.  * @param codingset set of VLC to decode data

  2662.  */

  2663. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2664. {

  2665.     GetBitContext *gb = &v->s.gb;

  2666.     MpegEncContext *s = &v->s;

  2667.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2668.     int run_diff, i;

  2669.     int16_t *dc_val;

  2670.     int16_t *ac_val, *ac_val2;

  2671.     int dcdiff;

  2672. 

  2673.     /* Get DC differential */

  2674.     if (n < 4) {

  2675.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2676.     } else {

  2677.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2678.     }

  2679.     if (dcdiff < 0){

  2680.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2681.         return -1;

  2682.     }

  2683.     if (dcdiff)

  2684.     {

  2685.         if (dcdiff == 119 /* ESC index value */)

  2686.         {

  2687.             /* TODO: Optimize */

  2688.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2689.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2690.             else dcdiff = get_bits(gb, 8);

  2691.         }

  2692.         else

  2693.         {

  2694.             if (v->pq == 1)

  2695.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2696.             else if (v->pq == 2)

  2697.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2698.         }

  2699.         if (get_bits(gb, 1))

  2700.             dcdiff = -dcdiff;

  2701.     }

  2702. 

  2703.     /* Prediction */

  2704.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2705.     *dc_val = dcdiff;

  2706. 

  2707.     /* Store the quantized DC coeff, used for prediction */

  2708.     if (n < 4) {

  2709.         block[0] = dcdiff * s->y_dc_scale;

  2710.     } else {

  2711.         block[0] = dcdiff * s->c_dc_scale;

  2712.     }

  2713.     /* Skip ? */

  2714.     run_diff = 0;

  2715.     i = 0;

  2716.     if (!coded) {

  2717.         goto not_coded;

  2718.     }

  2719. 

  2720.     //AC Decoding

  2721.     i = 1;

  2722. 

  2723.     {

  2724.         int last = 0, skip, value;

  2725.         const int8_t *zz_table;

  2726.         int scale;

  2727.         int k;

  2728. 

  2729.         scale = v->pq * 2 + v->halfpq;

  2730. 

  2731.         if(v->s.ac_pred) {

  2732.             if(!dc_pred_dir)

  2733.                 zz_table = vc1_horizontal_zz;

  2734.             else

  2735.                 zz_table = vc1_vertical_zz;

  2736.         } else

  2737.             zz_table = vc1_normal_zz;

  2738. 

  2739.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2740.         ac_val2 = ac_val;

  2741.         if(dc_pred_dir) //left

  2742.             ac_val -= 16;

  2743.         else //top

  2744.             ac_val -= 16 * s->block_wrap[n];

  2745. 

  2746.         while (!last) {

  2747.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2748.             i += skip;

  2749.             if(i > 63)

  2750.                 break;

  2751.             block[zz_table[i++]] = value;

  2752.         }

  2753. 

  2754.         /* apply AC prediction if needed */

  2755.         if(s->ac_pred) {

  2756.             if(dc_pred_dir) { //left

  2757.                 for(k = 1; k < 8; k++)

  2758.                     block[k << 3] += ac_val[k];

  2759.             } else { //top

  2760.                 for(k = 1; k < 8; k++)

  2761.                     block[k] += ac_val[k + 8];

  2762.             }

  2763.         }

  2764.         /* save AC coeffs for further prediction */

  2765.         for(k = 1; k < 8; k++) {

  2766.             ac_val2[k] = block[k << 3];

  2767.             ac_val2[k + 8] = block[k];

  2768.         }

  2769. 

  2770.         /* scale AC coeffs */

  2771.         for(k = 1; k < 64; k++)

  2772.             if(block[k]) {

  2773.                 block[k] *= scale;

  2774.                 if(!v->pquantizer)

  2775.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2776.             }

  2777. 

  2778.         if(s->ac_pred) i = 63;

  2779.     }

  2780. 

  2781. not_coded:

  2782.     if(!coded) {

  2783.         int k, scale;

  2784.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2785.         ac_val2 = ac_val;

  2786. 

  2787.         scale = v->pq * 2 + v->halfpq;

  2788.         memset(ac_val2, 0, 16 * 2);

  2789.         if(dc_pred_dir) {//left

  2790.             ac_val -= 16;

  2791.             if(s->ac_pred)

  2792.                 memcpy(ac_val2, ac_val, 8 * 2);

  2793.         } else {//top

  2794.             ac_val -= 16 * s->block_wrap[n];

  2795.             if(s->ac_pred)

  2796.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2797.         }

  2798. 

  2799.         /* apply AC prediction if needed */

  2800.         if(s->ac_pred) {

  2801.             if(dc_pred_dir) { //left

  2802.                 for(k = 1; k < 8; k++) {

  2803.                     block[k << 3] = ac_val[k] * scale;

  2804.                     if(!v->pquantizer && block[k << 3])

  2805.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2806.                 }

  2807.             } else { //top

  2808.                 for(k = 1; k < 8; k++) {

  2809.                     block[k] = ac_val[k + 8] * scale;

  2810.                     if(!v->pquantizer && block[k])

  2811.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2812.                 }

  2813.             }

  2814.             i = 63;

  2815.         }

  2816.     }

  2817.     s->block_last_index[n] = i;

  2818. 

  2819.     return 0;

  2820. }

  2821. 

  2822. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2823.  * @param v VC1Context

  2824.  * @param block block to decode

  2825.  * @param coded are AC coeffs present or not

  2826.  * @param codingset set of VLC to decode data

  2827.  */

  2828. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2829. {

  2830.     GetBitContext *gb = &v->s.gb;

  2831.     MpegEncContext *s = &v->s;

  2832.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2833.     int run_diff, i;

  2834.     int16_t *dc_val;

  2835.     int16_t *ac_val, *ac_val2;

  2836.     int dcdiff;

  2837.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2838.     int use_pred = s->ac_pred;

  2839.     int scale;

  2840.     int q1, q2 = 0;

  2841.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2842. 

  2843.     /* Get DC differential */

  2844.     if (n < 4) {

  2845.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2846.     } else {

  2847.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2848.     }

  2849.     if (dcdiff < 0){

  2850.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2851.         return -1;

  2852.     }

  2853.     if (dcdiff)

  2854.     {

  2855.         if (dcdiff == 119 /* ESC index value */)

  2856.         {

  2857.             /* TODO: Optimize */

  2858.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2859.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2860.             else dcdiff = get_bits(gb, 8);

  2861.         }

  2862.         else

  2863.         {

  2864.             if (mquant == 1)

  2865.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2866.             else if (mquant == 2)

  2867.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2868.         }

  2869.         if (get_bits(gb, 1))

  2870.             dcdiff = -dcdiff;

  2871.     }

  2872. 

  2873.     /* Prediction */

  2874.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2875.     *dc_val = dcdiff;

  2876. 

  2877.     /* Store the quantized DC coeff, used for prediction */

  2878.     if (n < 4) {

  2879.         block[0] = dcdiff * s->y_dc_scale;

  2880.     } else {

  2881.         block[0] = dcdiff * s->c_dc_scale;

  2882.     }

  2883.     /* Skip ? */

  2884.     run_diff = 0;

  2885.     i = 0;

  2886. 

  2887.     //AC Decoding

  2888.     i = 1;

  2889. 

  2890.     /* check if AC is needed at all and adjust direction if needed */

  2891.     if(!a_avail) dc_pred_dir = 1;

  2892.     if(!c_avail) dc_pred_dir = 0;

  2893.     if(!a_avail && !c_avail) use_pred = 0;

  2894.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2895.     ac_val2 = ac_val;

  2896. 

  2897.     scale = mquant * 2 + v->halfpq;

  2898. 

  2899.     if(dc_pred_dir) //left

  2900.         ac_val -= 16;

  2901.     else //top

  2902.         ac_val -= 16 * s->block_wrap[n];

  2903. 

  2904.     q1 = s->current_picture.qscale_table[mb_pos];

  2905.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2906.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2907.     if(n && n<4) q2 = q1;

  2908. 

  2909.     if(coded) {

  2910.         int last = 0, skip, value;

  2911.         const int8_t *zz_table;

  2912.         int k;

  2913. 

  2914.         if(v->s.ac_pred) {

  2915.             if(!dc_pred_dir)

  2916.                 zz_table = vc1_horizontal_zz;

  2917.             else

  2918.                 zz_table = vc1_vertical_zz;

  2919.         } else

  2920.             zz_table = vc1_normal_zz;

  2921. 

  2922.         while (!last) {

  2923.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2924.             i += skip;

  2925.             if(i > 63)

  2926.                 break;

  2927.             block[zz_table[i++]] = value;

  2928.         }

  2929. 

  2930.         /* apply AC prediction if needed */

  2931.         if(use_pred) {

  2932.             /* scale predictors if needed*/

  2933.             if(q2 && q1!=q2) {

  2934.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2935.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2936. 

  2937.                 if(dc_pred_dir) { //left

  2938.                     for(k = 1; k < 8; k++)

  2939.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2940.                 } else { //top

  2941.                     for(k = 1; k < 8; k++)

  2942.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2943.                 }

  2944.             } else {

  2945.                 if(dc_pred_dir) { //left

  2946.                     for(k = 1; k < 8; k++)

  2947.                         block[k << 3] += ac_val[k];

  2948.                 } else { //top

  2949.                     for(k = 1; k < 8; k++)

  2950.                         block[k] += ac_val[k + 8];

  2951.                 }

  2952.             }

  2953.         }

  2954.         /* save AC coeffs for further prediction */

  2955.         for(k = 1; k < 8; k++) {

  2956.             ac_val2[k] = block[k << 3];

  2957.             ac_val2[k + 8] = block[k];

  2958.         }

  2959. 

  2960.         /* scale AC coeffs */

  2961.         for(k = 1; k < 64; k++)

  2962.             if(block[k]) {

  2963.                 block[k] *= scale;

  2964.                 if(!v->pquantizer)

  2965.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2966.             }

  2967. 

  2968.         if(use_pred) i = 63;

  2969.     } else { // no AC coeffs

  2970.         int k;

  2971. 

  2972.         memset(ac_val2, 0, 16 * 2);

  2973.         if(dc_pred_dir) {//left

  2974.             if(use_pred) {

  2975.                 memcpy(ac_val2, ac_val, 8 * 2);

  2976.                 if(q2 && q1!=q2) {

  2977.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2978.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2979.                     for(k = 1; k < 8; k++)

  2980.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2981.                 }

  2982.             }

  2983.         } else {//top

  2984.             if(use_pred) {

  2985.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2986.                 if(q2 && q1!=q2) {

  2987.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2988.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2989.                     for(k = 1; k < 8; k++)

  2990.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2991.                 }

  2992.             }

  2993.         }

  2994. 

  2995.         /* apply AC prediction if needed */

  2996.         if(use_pred) {

  2997.             if(dc_pred_dir) { //left

  2998.                 for(k = 1; k < 8; k++) {

  2999.                     block[k << 3] = ac_val2[k] * scale;

  3000.                     if(!v->pquantizer && block[k << 3])

  3001.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3002.                 }

  3003.             } else { //top

  3004.                 for(k = 1; k < 8; k++) {

  3005.                     block[k] = ac_val2[k + 8] * scale;

  3006.                     if(!v->pquantizer && block[k])

  3007.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3008.                 }

  3009.             }

  3010.             i = 63;

  3011.         }

  3012.     }

  3013.     s->block_last_index[n] = i;

  3014. 

  3015.     return 0;

  3016. }

  3017. 

  3018. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  3019.  * @param v VC1Context

  3020.  * @param block block to decode

  3021.  * @param coded are AC coeffs present or not

  3022.  * @param mquant block quantizer

  3023.  * @param codingset set of VLC to decode data

  3024.  */

  3025. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  3026. {

  3027.     GetBitContext *gb = &v->s.gb;

  3028.     MpegEncContext *s = &v->s;

  3029.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  3030.     int run_diff, i;

  3031.     int16_t *dc_val;

  3032.     int16_t *ac_val, *ac_val2;

  3033.     int dcdiff;

  3034.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3035.     int a_avail = v->a_avail, c_avail = v->c_avail;

  3036.     int use_pred = s->ac_pred;

  3037.     int scale;

  3038.     int q1, q2 = 0;

  3039. 

  3040.     /* XXX: Guard against dumb values of mquant */

  3041.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  3042. 

  3043.     /* Set DC scale - y and c use the same */

  3044.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  3045.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  3046. 

  3047.     /* Get DC differential */

  3048.     if (n < 4) {

  3049.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3050.     } else {

  3051.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3052.     }

  3053.     if (dcdiff < 0){

  3054.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  3055.         return -1;

  3056.     }

  3057.     if (dcdiff)

  3058.     {

  3059.         if (dcdiff == 119 /* ESC index value */)

  3060.         {

  3061.             /* TODO: Optimize */

  3062.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  3063.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  3064.             else dcdiff = get_bits(gb, 8);

  3065.         }

  3066.         else

  3067.         {

  3068.             if (mquant == 1)

  3069.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  3070.             else if (mquant == 2)

  3071.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  3072.         }

  3073.         if (get_bits(gb, 1))

  3074.             dcdiff = -dcdiff;

  3075.     }

  3076. 

  3077.     /* Prediction */

  3078.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  3079.     *dc_val = dcdiff;

  3080. 

  3081.     /* Store the quantized DC coeff, used for prediction */

  3082. 

  3083.     if (n < 4) {

  3084.         block[0] = dcdiff * s->y_dc_scale;

  3085.     } else {

  3086.         block[0] = dcdiff * s->c_dc_scale;

  3087.     }

  3088.     /* Skip ? */

  3089.     run_diff = 0;

  3090.     i = 0;

  3091. 

  3092.     //AC Decoding

  3093.     i = 1;

  3094. 

  3095.     /* check if AC is needed at all and adjust direction if needed */

  3096.     if(!a_avail) dc_pred_dir = 1;

  3097.     if(!c_avail) dc_pred_dir = 0;

  3098.     if(!a_avail && !c_avail) use_pred = 0;

  3099.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3100.     ac_val2 = ac_val;

  3101. 

  3102.     scale = mquant * 2 + v->halfpq;

  3103. 

  3104.     if(dc_pred_dir) //left

  3105.         ac_val -= 16;

  3106.     else //top

  3107.         ac_val -= 16 * s->block_wrap[n];

  3108. 

  3109.     q1 = s->current_picture.qscale_table[mb_pos];

  3110.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  3111.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3112.     if(n && n<4) q2 = q1;

  3113. 

  3114.     if(coded) {

  3115.         int last = 0, skip, value;

  3116.         const int8_t *zz_table;

  3117.         int k;

  3118. 

  3119.         zz_table = vc1_simple_progressive_8x8_zz;

  3120. 

  3121.         while (!last) {

  3122.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3123.             i += skip;

  3124.             if(i > 63)

  3125.                 break;

  3126.             block[zz_table[i++]] = value;

  3127.         }

  3128. 

  3129.         /* apply AC prediction if needed */

  3130.         if(use_pred) {

  3131.             /* scale predictors if needed*/

  3132.             if(q2 && q1!=q2) {

  3133.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3134.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3135. 

  3136.                 if(dc_pred_dir) { //left

  3137.                     for(k = 1; k < 8; k++)

  3138.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3139.                 } else { //top

  3140.                     for(k = 1; k < 8; k++)

  3141.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3142.                 }

  3143.             } else {

  3144.                 if(dc_pred_dir) { //left

  3145.                     for(k = 1; k < 8; k++)

  3146.                         block[k << 3] += ac_val[k];

  3147.                 } else { //top

  3148.                     for(k = 1; k < 8; k++)

  3149.                         block[k] += ac_val[k + 8];

  3150.                 }

  3151.             }

  3152.         }

  3153.         /* save AC coeffs for further prediction */

  3154.         for(k = 1; k < 8; k++) {

  3155.             ac_val2[k] = block[k << 3];

  3156.             ac_val2[k + 8] = block[k];

  3157.         }

  3158. 

  3159.         /* scale AC coeffs */

  3160.         for(k = 1; k < 64; k++)

  3161.             if(block[k]) {

  3162.                 block[k] *= scale;

  3163.                 if(!v->pquantizer)

  3164.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3165.             }

  3166. 

  3167.         if(use_pred) i = 63;

  3168.     } else { // no AC coeffs

  3169.         int k;

  3170. 

  3171.         memset(ac_val2, 0, 16 * 2);

  3172.         if(dc_pred_dir) {//left

  3173.             if(use_pred) {

  3174.                 memcpy(ac_val2, ac_val, 8 * 2);

  3175.                 if(q2 && q1!=q2) {

  3176.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3177.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3178.                     for(k = 1; k < 8; k++)

  3179.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3180.                 }

  3181.             }

  3182.         } else {//top

  3183.             if(use_pred) {

  3184.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3185.                 if(q2 && q1!=q2) {

  3186.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3187.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3188.                     for(k = 1; k < 8; k++)

  3189.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3190.                 }

  3191.             }

  3192.         }

  3193. 

  3194.         /* apply AC prediction if needed */

  3195.         if(use_pred) {

  3196.             if(dc_pred_dir) { //left

  3197.                 for(k = 1; k < 8; k++) {

  3198.                     block[k << 3] = ac_val2[k] * scale;

  3199.                     if(!v->pquantizer && block[k << 3])

  3200.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3201.                 }

  3202.             } else { //top

  3203.                 for(k = 1; k < 8; k++) {

  3204.                     block[k] = ac_val2[k + 8] * scale;

  3205.                     if(!v->pquantizer && block[k])

  3206.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3207.                 }

  3208.             }

  3209.             i = 63;

  3210.         }

  3211.     }

  3212.     s->block_last_index[n] = i;

  3213. 

  3214.     return 0;

  3215. }

  3216. 

  3217. /** Decode P block

  3218.  */

  3219. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  3220. {

  3221.     MpegEncContext *s = &v->s;

  3222.     GetBitContext *gb = &s->gb;

  3223.     int i, j;

  3224.     int subblkpat = 0;

  3225.     int scale, off, idx, last, skip, value;

  3226.     int ttblk = ttmb & 7;

  3227. 

  3228.     if(ttmb == -1) {

  3229.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  3230.     }

  3231.     if(ttblk == TT_4X4) {

  3232.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3233.     }

  3234.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  3235.         subblkpat = decode012(gb);

  3236.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  3237.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  3238.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  3239.     }

  3240.     scale = 2 * mquant + v->halfpq;

  3241. 

  3242.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3243.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3244.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3245.         ttblk = TT_8X4;

  3246.     }

  3247.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3248.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3249.         ttblk = TT_4X8;

  3250.     }

  3251.     switch(ttblk) {

  3252.     case TT_8X8:

  3253.         i = 0;

  3254.         last = 0;

  3255.         while (!last) {

  3256.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3257.             i += skip;

  3258.             if(i > 63)

  3259.                 break;

  3260.             idx = vc1_simple_progressive_8x8_zz[i++];

  3261.             block[idx] = value * scale;

  3262.             if(!v->pquantizer)

  3263.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3264.         }

  3265.         s->dsp.vc1_inv_trans_8x8(block);

  3266.         break;

  3267.     case TT_4X4:

  3268.         for(j = 0; j < 4; j++) {

  3269.             last = subblkpat & (1 << (3 - j));

  3270.             i = 0;

  3271.             off = (j & 1) * 4 + (j & 2) * 16;

  3272.             while (!last) {

  3273.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3274.                 i += skip;

  3275.                 if(i > 15)

  3276.                     break;

  3277.                 idx = vc1_simple_progressive_4x4_zz[i++];

  3278.                 block[idx + off] = value * scale;

  3279.                 if(!v->pquantizer)

  3280.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3281.             }

  3282.             if(!(subblkpat & (1 << (3 - j))))

  3283.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3284.         }

  3285.         break;

  3286.     case TT_8X4:

  3287.         for(j = 0; j < 2; j++) {

  3288.             last = subblkpat & (1 << (1 - j));

  3289.             i = 0;

  3290.             off = j * 32;

  3291.             while (!last) {

  3292.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3293.                 i += skip;

  3294.                 if(i > 31)

  3295.                     break;

  3296.                 if(v->profile < PROFILE_ADVANCED)

  3297.                     idx = vc1_simple_progressive_8x4_zz[i++];

  3298.                 else

  3299.                     idx = vc1_adv_progressive_8x4_zz[i++];

  3300.                 block[idx + off] = value * scale;

  3301.                 if(!v->pquantizer)

  3302.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3303.             }

  3304.             if(!(subblkpat & (1 << (1 - j))))

  3305.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3306.         }

  3307.         break;

  3308.     case TT_4X8:

  3309.         for(j = 0; j < 2; j++) {

  3310.             last = subblkpat & (1 << (1 - j));

  3311.             i = 0;

  3312.             off = j * 4;

  3313.             while (!last) {

  3314.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3315.                 i += skip;

  3316.                 if(i > 31)

  3317.                     break;

  3318.                 if(v->profile < PROFILE_ADVANCED)

  3319.                     idx = vc1_simple_progressive_4x8_zz[i++];

  3320.                 else

  3321.                     idx = vc1_adv_progressive_4x8_zz[i++];

  3322.                 block[idx + off] = value * scale;

  3323.                 if(!v->pquantizer)

  3324.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3325.             }

  3326.             if(!(subblkpat & (1 << (1 - j))))

  3327.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3328.         }

  3329.         break;

  3330.     }

  3331.     return 0;

  3332. }

  3333. 

  3334. 

  3335. /** Decode one P-frame MB (in Simple/Main profile)

  3336.  */

  3337. static int vc1_decode_p_mb(VC1Context *v)

  3338. {

  3339.     MpegEncContext *s = &v->s;

  3340.     GetBitContext *gb = &s->gb;

  3341.     int i, j;

  3342.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3343.     int cbp; /* cbp decoding stuff */

  3344.     int mqdiff, mquant; /* MB quantization */

  3345.     int ttmb = v->ttfrm; /* MB Transform type */

  3346.     int status;

  3347. 

  3348.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3349.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3350.     int mb_has_coeffs = 1; /* last_flag */

  3351.     int dmv_x, dmv_y; /* Differential MV components */

  3352.     int index, index1; /* LUT indices */

  3353.     int val, sign; /* temp values */

  3354.     int first_block = 1;

  3355.     int dst_idx, off;

  3356.     int skipped, fourmv;

  3357. 

  3358.     mquant = v->pq; /* Loosy initialization */

  3359. 

  3360.     if (v->mv_type_is_raw)

  3361.         fourmv = get_bits1(gb);

  3362.     else

  3363.         fourmv = v->mv_type_mb_plane[mb_pos];

  3364.     if (v->skip_is_raw)

  3365.         skipped = get_bits1(gb);

  3366.     else

  3367.         skipped = v->s.mbskip_table[mb_pos];

  3368. 

  3369.     s->dsp.clear_blocks(s->block[0]);

  3370. 

  3371.     if (!fourmv) /* 1MV mode */

  3372.     {

  3373.         if (!skipped)

  3374.         {

  3375.             GET_MVDATA(dmv_x, dmv_y);

  3376. 

  3377.             if (s->mb_intra) {

  3378.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3379.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3380.             }

  3381.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3382.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3383. 

  3384.             /* FIXME Set DC val for inter block ? */

  3385.             if (s->mb_intra && !mb_has_coeffs)

  3386.             {

  3387.                 GET_MQUANT();

  3388.                 s->ac_pred = get_bits(gb, 1);

  3389.                 cbp = 0;

  3390.             }

  3391.             else if (mb_has_coeffs)

  3392.             {

  3393.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3394.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3395.                 GET_MQUANT();

  3396.             }

  3397.             else

  3398.             {

  3399.                 mquant = v->pq;

  3400.                 cbp = 0;

  3401.             }

  3402.             s->current_picture.qscale_table[mb_pos] = mquant;

  3403. 

  3404.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3405.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  3406.                                 VC1_TTMB_VLC_BITS, 2);

  3407.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3408.             dst_idx = 0;

  3409.             for (i=0; i<6; i++)

  3410.             {

  3411.                 s->dc_val[0][s->block_index[i]] = 0;

  3412.                 dst_idx += i >> 2;

  3413.                 val = ((cbp >> (5 - i)) & 1);

  3414.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3415.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3416.                 if(s->mb_intra) {

  3417.                     /* check if prediction blocks A and C are available */

  3418.                     v->a_avail = v->c_avail = 0;

  3419.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3420.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3421.                     if(i == 1 || i == 3 || s->mb_x)

  3422.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3423. 

  3424.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3425.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3426.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3427.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3428.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3429.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3430.                     if(v->pq >= 9 && v->overlap) {

  3431.                         if(v->c_avail)

  3432.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3433.                         if(v->a_avail)

  3434.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3435.                     }

  3436.                 } else if(val) {

  3437.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3438.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3439.                     first_block = 0;

  3440.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3441.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3442.                 }

  3443.             }

  3444.         }

  3445.         else //Skipped

  3446.         {

  3447.             s->mb_intra = 0;

  3448.             for(i = 0; i < 6; i++) {

  3449.                 v->mb_type[0][s->block_index[i]] = 0;

  3450.                 s->dc_val[0][s->block_index[i]] = 0;

  3451.             }

  3452.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3453.             s->current_picture.qscale_table[mb_pos] = 0;

  3454.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3455.             vc1_mc_1mv(v, 0);

  3456.             return 0;

  3457.         }

  3458.     } //1MV mode

  3459.     else //4MV mode

  3460.     {

  3461.         if (!skipped /* unskipped MB */)

  3462.         {

  3463.             int intra_count = 0, coded_inter = 0;

  3464.             int is_intra[6], is_coded[6];

  3465.             /* Get CBPCY */

  3466.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3467.             for (i=0; i<6; i++)

  3468.             {

  3469.                 val = ((cbp >> (5 - i)) & 1);

  3470.                 s->dc_val[0][s->block_index[i]] = 0;

  3471.                 s->mb_intra = 0;

  3472.                 if(i < 4) {

  3473.                     dmv_x = dmv_y = 0;

  3474.                     s->mb_intra = 0;

  3475.                     mb_has_coeffs = 0;

  3476.                     if(val) {

  3477.                         GET_MVDATA(dmv_x, dmv_y);

  3478.                     }

  3479.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3480.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3481.                     intra_count += s->mb_intra;

  3482.                     is_intra[i] = s->mb_intra;

  3483.                     is_coded[i] = mb_has_coeffs;

  3484.                 }

  3485.                 if(i&4){

  3486.                     is_intra[i] = (intra_count >= 3);

  3487.                     is_coded[i] = val;

  3488.                 }

  3489.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3490.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3491.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3492.             }

  3493.             // if there are no coded blocks then don't do anything more

  3494.             if(!intra_count && !coded_inter) return 0;

  3495.             dst_idx = 0;

  3496.             GET_MQUANT();

  3497.             s->current_picture.qscale_table[mb_pos] = mquant;

  3498.             /* test if block is intra and has pred */

  3499.             {

  3500.                 int intrapred = 0;

  3501.                 for(i=0; i<6; i++)

  3502.                     if(is_intra[i]) {

  3503.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3504.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3505.                             intrapred = 1;

  3506.                             break;

  3507.                         }

  3508.                     }

  3509.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3510.                 else s->ac_pred = 0;

  3511.             }

  3512.             if (!v->ttmbf && coded_inter)

  3513.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3514.             for (i=0; i<6; i++)

  3515.             {

  3516.                 dst_idx += i >> 2;

  3517.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3518.                 s->mb_intra = is_intra[i];

  3519.                 if (is_intra[i]) {

  3520.                     /* check if prediction blocks A and C are available */

  3521.                     v->a_avail = v->c_avail = 0;

  3522.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3523.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3524.                     if(i == 1 || i == 3 || s->mb_x)

  3525.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3526. 

  3527.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3528.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3529.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3530.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3531.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3532.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3533.                     if(v->pq >= 9 && v->overlap) {

  3534.                         if(v->c_avail)

  3535.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3536.                         if(v->a_avail)

  3537.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3538.                     }

  3539.                 } else if(is_coded[i]) {

  3540.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3541.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3542.                     first_block = 0;

  3543.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3544.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3545.                 }

  3546.             }

  3547.             return status;

  3548.         }

  3549.         else //Skipped MB

  3550.         {

  3551.             s->mb_intra = 0;

  3552.             s->current_picture.qscale_table[mb_pos] = 0;

  3553.             for (i=0; i<6; i++) {

  3554.                 v->mb_type[0][s->block_index[i]] = 0;

  3555.                 s->dc_val[0][s->block_index[i]] = 0;

  3556.             }

  3557.             for (i=0; i<4; i++)

  3558.             {

  3559.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3560.                 vc1_mc_4mv_luma(v, i);

  3561.             }

  3562.             vc1_mc_4mv_chroma(v);

  3563.             s->current_picture.qscale_table[mb_pos] = 0;

  3564.             return 0;

  3565.         }

  3566.     }

  3567. 

  3568.     /* Should never happen */

  3569.     return -1;

  3570. }

  3571. 

  3572. /** Decode one B-frame MB (in Main profile)

  3573.  */

  3574. static void vc1_decode_b_mb(VC1Context *v)

  3575. {

  3576.     MpegEncContext *s = &v->s;

  3577.     GetBitContext *gb = &s->gb;

  3578.     int i, j;

  3579.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3580.     int cbp = 0; /* cbp decoding stuff */

  3581.     int mqdiff, mquant; /* MB quantization */

  3582.     int ttmb = v->ttfrm; /* MB Transform type */

  3583. 

  3584.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3585.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3586.     int mb_has_coeffs = 0; /* last_flag */

  3587.     int index, index1; /* LUT indices */

  3588.     int val, sign; /* temp values */

  3589.     int first_block = 1;

  3590.     int dst_idx, off;

  3591.     int skipped, direct;

  3592.     int dmv_x[2], dmv_y[2];

  3593.     int bmvtype = BMV_TYPE_BACKWARD;

  3594. 

  3595.     mquant = v->pq; /* Loosy initialization */

  3596.     s->mb_intra = 0;

  3597. 

  3598.     if (v->dmb_is_raw)

  3599.         direct = get_bits1(gb);

  3600.     else

  3601.         direct = v->direct_mb_plane[mb_pos];

  3602.     if (v->skip_is_raw)

  3603.         skipped = get_bits1(gb);

  3604.     else

  3605.         skipped = v->s.mbskip_table[mb_pos];

  3606. 

  3607.     s->dsp.clear_blocks(s->block[0]);

  3608.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3609.     for(i = 0; i < 6; i++) {

  3610.         v->mb_type[0][s->block_index[i]] = 0;

  3611.         s->dc_val[0][s->block_index[i]] = 0;

  3612.     }

  3613.     s->current_picture.qscale_table[mb_pos] = 0;

  3614. 

  3615.     if (!direct) {

  3616.         if (!skipped) {

  3617.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3618.             dmv_x[1] = dmv_x[0];

  3619.             dmv_y[1] = dmv_y[0];

  3620.         }

  3621.         if(skipped || !s->mb_intra) {

  3622.             bmvtype = decode012(gb);

  3623.             switch(bmvtype) {

  3624.             case 0:

  3625.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3626.                 break;

  3627.             case 1:

  3628.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3629.                 break;

  3630.             case 2:

  3631.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3632.                 dmv_x[0] = dmv_y[0] = 0;

  3633.             }

  3634.         }

  3635.     }

  3636.     for(i = 0; i < 6; i++)

  3637.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3638. 

  3639.     if (skipped) {

  3640.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3641.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3642.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3643.         return;

  3644.     }

  3645.     if (direct) {

  3646.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3647.         GET_MQUANT();

  3648.         s->mb_intra = 0;

  3649.         mb_has_coeffs = 0;

  3650.         s->current_picture.qscale_table[mb_pos] = mquant;

  3651.         if(!v->ttmbf)

  3652.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3653.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3654.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3655.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3656.     } else {

  3657.         if(!mb_has_coeffs && !s->mb_intra) {

  3658.             /* no coded blocks - effectively skipped */

  3659.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3660.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3661.             return;

  3662.         }

  3663.         if(s->mb_intra && !mb_has_coeffs) {

  3664.             GET_MQUANT();

  3665.             s->current_picture.qscale_table[mb_pos] = mquant;

  3666.             s->ac_pred = get_bits1(gb);

  3667.             cbp = 0;

  3668.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3669.         } else {

  3670.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3671.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3672.                 if(!mb_has_coeffs) {

  3673.                     /* interpolated skipped block */

  3674.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3675.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3676.                     return;

  3677.                 }

  3678.             }

  3679.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3680.             if(!s->mb_intra) {

  3681.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3682.             }

  3683.             if(s->mb_intra)

  3684.                 s->ac_pred = get_bits1(gb);

  3685.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3686.             GET_MQUANT();

  3687.             s->current_picture.qscale_table[mb_pos] = mquant;

  3688.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3689.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3690.         }

  3691.     }

  3692.     dst_idx = 0;

  3693.     for (i=0; i<6; i++)

  3694.     {

  3695.         s->dc_val[0][s->block_index[i]] = 0;

  3696.         dst_idx += i >> 2;

  3697.         val = ((cbp >> (5 - i)) & 1);

  3698.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3699.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3700.         if(s->mb_intra) {

  3701.             /* check if prediction blocks A and C are available */

  3702.             v->a_avail = v->c_avail = 0;

  3703.             if(i == 2 || i == 3 || !s->first_slice_line)

  3704.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3705.             if(i == 1 || i == 3 || s->mb_x)

  3706.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3707. 

  3708.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3709.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3710.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3711.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3712.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3713.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3714.         } else if(val) {

  3715.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3716.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3717.             first_block = 0;

  3718.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3719.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3720.         }

  3721.     }

  3722. }

  3723. 

  3724. /** Decode blocks of I-frame

  3725.  */

  3726. static void vc1_decode_i_blocks(VC1Context *v)

  3727. {

  3728.     int k, j;

  3729.     MpegEncContext *s = &v->s;

  3730.     int cbp, val;

  3731.     uint8_t *coded_val;

  3732.     int mb_pos;

  3733. 

  3734.     /* select codingmode used for VLC tables selection */

  3735.     switch(v->y_ac_table_index){

  3736.     case 0:

  3737.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3738.         break;

  3739.     case 1:

  3740.         v->codingset = CS_HIGH_MOT_INTRA;

  3741.         break;

  3742.     case 2:

  3743.         v->codingset = CS_MID_RATE_INTRA;

  3744.         break;

  3745.     }

  3746. 

  3747.     switch(v->c_ac_table_index){

  3748.     case 0:

  3749.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3750.         break;

  3751.     case 1:

  3752.         v->codingset2 = CS_HIGH_MOT_INTER;

  3753.         break;

  3754.     case 2:

  3755.         v->codingset2 = CS_MID_RATE_INTER;

  3756.         break;

  3757.     }

  3758. 

  3759.     /* Set DC scale - y and c use the same */

  3760.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3761.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3762. 

  3763.     //do frame decode

  3764.     s->mb_x = s->mb_y = 0;

  3765.     s->mb_intra = 1;

  3766.     s->first_slice_line = 1;

  3767.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3768.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3769.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3770.             ff_init_block_index(s);

  3771.             ff_update_block_index(s);

  3772.             s->dsp.clear_blocks(s->block[0]);

  3773.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3774.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3775.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3776.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3777.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3778. 

  3779.             // do actual MB decoding and displaying

  3780.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3781.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3782. 

  3783.             for(k = 0; k < 6; k++) {

  3784.                 val = ((cbp >> (5 - k)) & 1);

  3785. 

  3786.                 if (k < 4) {

  3787.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3788.                     val = val ^ pred;

  3789.                     *coded_val = val;

  3790.                 }

  3791.                 cbp |= val << (5 - k);

  3792. 

  3793.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3794. 

  3795.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3796.                 if(v->pq >= 9 && v->overlap) {

  3797.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3798.                 }

  3799.             }

  3800. 

  3801.             vc1_put_block(v, s->block);

  3802.             if(v->pq >= 9 && v->overlap) {

  3803.                 if(s->mb_x) {

  3804.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3805.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3806.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3807.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3808.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3809.                     }

  3810.                 }

  3811.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3812.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3813.                 if(!s->first_slice_line) {

  3814.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3815.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3816.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3817.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3818.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3819.                     }

  3820.                 }

  3821.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3822.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3823.             }

  3824. 

  3825.             if(get_bits_count(&s->gb) > v->bits) {

  3826.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3827.                 return;

  3828.             }

  3829.         }

  3830.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3831.         s->first_slice_line = 0;

  3832.     }

  3833. }

  3834. 

  3835. /** Decode blocks of I-frame for advanced profile

  3836.  */

  3837. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3838. {

  3839.     int k, j;

  3840.     MpegEncContext *s = &v->s;

  3841.     int cbp, val;

  3842.     uint8_t *coded_val;

  3843.     int mb_pos;

  3844.     int mquant = v->pq;

  3845.     int mqdiff;

  3846.     int overlap;

  3847.     GetBitContext *gb = &s->gb;

  3848. 

  3849.     /* select codingmode used for VLC tables selection */

  3850.     switch(v->y_ac_table_index){

  3851.     case 0:

  3852.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3853.         break;

  3854.     case 1:

  3855.         v->codingset = CS_HIGH_MOT_INTRA;

  3856.         break;

  3857.     case 2:

  3858.         v->codingset = CS_MID_RATE_INTRA;

  3859.         break;

  3860.     }

  3861. 

  3862.     switch(v->c_ac_table_index){

  3863.     case 0:

  3864.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3865.         break;

  3866.     case 1:

  3867.         v->codingset2 = CS_HIGH_MOT_INTER;

  3868.         break;

  3869.     case 2:

  3870.         v->codingset2 = CS_MID_RATE_INTER;

  3871.         break;

  3872.     }

  3873. 

  3874.     //do frame decode

  3875.     s->mb_x = s->mb_y = 0;

  3876.     s->mb_intra = 1;

  3877.     s->first_slice_line = 1;

  3878.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3879.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3880.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3881.             ff_init_block_index(s);

  3882.             ff_update_block_index(s);

  3883.             s->dsp.clear_blocks(s->block[0]);

  3884.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3885.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3886.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3887.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3888. 

  3889.             // do actual MB decoding and displaying

  3890.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3891.             if(v->acpred_is_raw)

  3892.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3893.             else

  3894.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3895. 

  3896.             if(v->condover == CONDOVER_SELECT) {

  3897.                 if(v->overflg_is_raw)

  3898.                     overlap = get_bits(&v->s.gb, 1);

  3899.                 else

  3900.                     overlap = v->over_flags_plane[mb_pos];

  3901.             } else

  3902.                 overlap = (v->condover == CONDOVER_ALL);

  3903. 

  3904.             GET_MQUANT();

  3905. 

  3906.             s->current_picture.qscale_table[mb_pos] = mquant;

  3907.             /* Set DC scale - y and c use the same */

  3908.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3909.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3910. 

  3911.             for(k = 0; k < 6; k++) {

  3912.                 val = ((cbp >> (5 - k)) & 1);

  3913. 

  3914.                 if (k < 4) {

  3915.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3916.                     val = val ^ pred;

  3917.                     *coded_val = val;

  3918.                 }

  3919.                 cbp |= val << (5 - k);

  3920. 

  3921.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3922.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3923. 

  3924.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3925. 

  3926.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3927.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3928.             }

  3929. 

  3930.             vc1_put_block(v, s->block);

  3931.             if(overlap) {

  3932.                 if(s->mb_x) {

  3933.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3934.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3935.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3936.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3937.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3938.                     }

  3939.                 }

  3940.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3941.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3942.                 if(!s->first_slice_line) {

  3943.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3944.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3945.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3946.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3947.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3948.                     }

  3949.                 }

  3950.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3951.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3952.             }

  3953. 

  3954.             if(get_bits_count(&s->gb) > v->bits) {

  3955.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3956.                 return;

  3957.             }

  3958.         }

  3959.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3960.         s->first_slice_line = 0;

  3961.     }

  3962. }

  3963. 

  3964. static void vc1_decode_p_blocks(VC1Context *v)

  3965. {

  3966.     MpegEncContext *s = &v->s;

  3967. 

  3968.     /* select codingmode used for VLC tables selection */

  3969.     switch(v->c_ac_table_index){

  3970.     case 0:

  3971.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3972.         break;

  3973.     case 1:

  3974.         v->codingset = CS_HIGH_MOT_INTRA;

  3975.         break;

  3976.     case 2:

  3977.         v->codingset = CS_MID_RATE_INTRA;

  3978.         break;

  3979.     }

  3980. 

  3981.     switch(v->c_ac_table_index){

  3982.     case 0:

  3983.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3984.         break;

  3985.     case 1:

  3986.         v->codingset2 = CS_HIGH_MOT_INTER;

  3987.         break;

  3988.     case 2:

  3989.         v->codingset2 = CS_MID_RATE_INTER;

  3990.         break;

  3991.     }

  3992. 

  3993.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3994.     s->first_slice_line = 1;

  3995.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3996.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3997.             ff_init_block_index(s);

  3998.             ff_update_block_index(s);

  3999.             s->dsp.clear_blocks(s->block[0]);

  4000. 

  4001.             vc1_decode_p_mb(v);

  4002.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4003.                 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);

  4004.                 return;

  4005.             }

  4006.         }

  4007.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4008.         s->first_slice_line = 0;

  4009.     }

  4010. }

  4011. 

  4012. static void vc1_decode_b_blocks(VC1Context *v)

  4013. {

  4014.     MpegEncContext *s = &v->s;

  4015. 

  4016.     /* select codingmode used for VLC tables selection */

  4017.     switch(v->c_ac_table_index){

  4018.     case 0:

  4019.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4020.         break;

  4021.     case 1:

  4022.         v->codingset = CS_HIGH_MOT_INTRA;

  4023.         break;

  4024.     case 2:

  4025.         v->codingset = CS_MID_RATE_INTRA;

  4026.         break;

  4027.     }

  4028. 

  4029.     switch(v->c_ac_table_index){

  4030.     case 0:

  4031.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4032.         break;

  4033.     case 1:

  4034.         v->codingset2 = CS_HIGH_MOT_INTER;

  4035.         break;

  4036.     case 2:

  4037.         v->codingset2 = CS_MID_RATE_INTER;

  4038.         break;

  4039.     }

  4040. 

  4041.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4042.     s->first_slice_line = 1;

  4043.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4044.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  4045.             ff_init_block_index(s);

  4046.             ff_update_block_index(s);

  4047.             s->dsp.clear_blocks(s->block[0]);

  4048. 

  4049.             vc1_decode_b_mb(v);

  4050.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4051.                 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);

  4052.                 return;

  4053.             }

  4054.         }

  4055.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4056.         s->first_slice_line = 0;

  4057.     }

  4058. }

  4059. 

  4060. static void vc1_decode_skip_blocks(VC1Context *v)

  4061. {

  4062.     MpegEncContext *s = &v->s;

  4063. 

  4064.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4065.     s->first_slice_line = 1;

  4066.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4067.         s->mb_x = 0;

  4068.         ff_init_block_index(s);

  4069.         ff_update_block_index(s);

  4070.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  4071.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4072.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4073.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4074.         s->first_slice_line = 0;

  4075.     }

  4076.     s->pict_type = P_TYPE;

  4077. }

  4078. 

  4079. static void vc1_decode_blocks(VC1Context *v)

  4080. {

  4081. 

  4082.     v->s.esc3_level_length = 0;

  4083. 

  4084.     switch(v->s.pict_type) {

  4085.     case I_TYPE:

  4086.         if(v->profile == PROFILE_ADVANCED)

  4087.             vc1_decode_i_blocks_adv(v);

  4088.         else

  4089.             vc1_decode_i_blocks(v);

  4090.         break;

  4091.     case P_TYPE:

  4092.         if(v->p_frame_skipped)

  4093.             vc1_decode_skip_blocks(v);

  4094.         else

  4095.             vc1_decode_p_blocks(v);

  4096.         break;

  4097.     case B_TYPE:

  4098.         if(v->bi_type){

  4099.             if(v->profile == PROFILE_ADVANCED)

  4100.                 vc1_decode_i_blocks_adv(v);

  4101.             else

  4102.                 vc1_decode_i_blocks(v);

  4103.         }else

  4104.             vc1_decode_b_blocks(v);

  4105.         break;

  4106.     }

  4107. }

  4108. 

  4109. #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)

  4110. 

  4111. /** Find VC-1 marker in buffer

  4112.  * @return position where next marker starts or end of buffer if no marker found

  4113.  */

  4114. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  4115. {

  4116.     uint32_t mrk = 0xFFFFFFFF;

  4117. 

  4118.     if(end-src < 4) return end;

  4119.     while(src < end){

  4120.         mrk = (mrk << 8) | *src++;

  4121.         if(IS_MARKER(mrk))

  4122.             return src-4;

  4123.     }

  4124.     return end;

  4125. }

  4126. 

  4127. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  4128. {

  4129.     int dsize = 0, i;

  4130. 

  4131.     if(size < 4){

  4132.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  4133.         return size;

  4134.     }

  4135.     for(i = 0; i < size; i++, src++) {

  4136.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  4137.             dst[dsize++] = src[1];

  4138.             src++;

  4139.             i++;

  4140.         } else

  4141.             dst[dsize++] = *src;

  4142.     }

  4143.     return dsize;

  4144. }

  4145. 

  4146. /** Initialize a VC1/WMV3 decoder

  4147.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4148.  * @todo TODO: Decypher remaining bits in extra_data

  4149.  */

  4150. static int vc1_decode_init(AVCodecContext *avctx)

  4151. {

  4152.     VC1Context *v = avctx->priv_data;

  4153.     MpegEncContext *s = &v->s;

  4154.     GetBitContext gb;

  4155. 

  4156.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  4157.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  4158.         avctx->pix_fmt = PIX_FMT_YUV420P;

  4159.     else

  4160.         avctx->pix_fmt = PIX_FMT_GRAY8;

  4161.     v->s.avctx = avctx;

  4162.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  4163.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  4164. 

  4165.     if(ff_h263_decode_init(avctx) < 0)

  4166.         return -1;

  4167.     if (vc1_init_common(v) < 0) return -1;

  4168. 

  4169.     avctx->coded_width = avctx->width;

  4170.     avctx->coded_height = avctx->height;

  4171.     if (avctx->codec_id == CODEC_ID_WMV3)

  4172.     {

  4173.         int count = 0;

  4174. 

  4175.         // looks like WMV3 has a sequence header stored in the extradata

  4176.         // advanced sequence header may be before the first frame

  4177.         // the last byte of the extradata is a version number, 1 for the

  4178.         // samples we can decode

  4179. 

  4180.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  4181. 

  4182.         if (decode_sequence_header(avctx, &gb) < 0)

  4183.           return -1;

  4184. 

  4185.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  4186.         if (count>0)

  4187.         {

  4188.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  4189.                    count, get_bits(&gb, count));

  4190.         }

  4191.         else if (count < 0)

  4192.         {

  4193.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  4194.         }

  4195.     } else { // VC1/WVC1

  4196.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  4197.         uint8_t *next; int size, buf2_size;

  4198.         uint8_t *buf2 = NULL;

  4199.         int seq_inited = 0, ep_inited = 0;

  4200. 

  4201.         if(avctx->extradata_size < 16) {

  4202.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  4203.             return -1;

  4204.         }

  4205. 

  4206.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4207.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  4208.         next = start;

  4209.         for(; next < end; start = next){

  4210.             next = find_next_marker(start + 4, end);

  4211.             size = next - start - 4;

  4212.             if(size <= 0) continue;

  4213.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  4214.             init_get_bits(&gb, buf2, buf2_size * 8);

  4215.             switch(AV_RB32(start)){

  4216.             case VC1_CODE_SEQHDR:

  4217.                 if(decode_sequence_header(avctx, &gb) < 0){

  4218.                     av_free(buf2);

  4219.                     return -1;

  4220.                 }

  4221.                 seq_inited = 1;

  4222.                 break;

  4223.             case VC1_CODE_ENTRYPOINT:

  4224.                 if(decode_entry_point(avctx, &gb) < 0){

  4225.                     av_free(buf2);

  4226.                     return -1;

  4227.                 }

  4228.                 ep_inited = 1;

  4229.                 break;

  4230.             }

  4231.         }

  4232.         av_free(buf2);

  4233.         if(!seq_inited || !ep_inited){

  4234.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  4235.             return -1;

  4236.         }

  4237.     }

  4238.     avctx->has_b_frames= !!(avctx->max_b_frames);

  4239.     s->low_delay = !avctx->has_b_frames;

  4240. 

  4241.     s->mb_width = (avctx->coded_width+15)>>4;

  4242.     s->mb_height = (avctx->coded_height+15)>>4;

  4243. 

  4244.     /* Allocate mb bitplanes */

  4245.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4246.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4247.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  4248.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  4249. 

  4250.     /* allocate block type info in that way so it could be used with s->block_index[] */

  4251.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  4252.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  4253.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  4254.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  4255. 

  4256.     /* Init coded blocks info */

  4257.     if (v->profile == PROFILE_ADVANCED)

  4258.     {

  4259. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  4260. //            return -1;

  4261. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  4262. //            return -1;

  4263.     }

  4264. 

  4265.     return 0;

  4266. }

  4267. 

  4268. 

  4269. /** Decode a VC1/WMV3 frame

  4270.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4271.  */

  4272. static int vc1_decode_frame(AVCodecContext *avctx,

  4273.                             void *data, int *data_size,

  4274.                             uint8_t *buf, int buf_size)

  4275. {

  4276.     VC1Context *v = avctx->priv_data;

  4277.     MpegEncContext *s = &v->s;

  4278.     AVFrame *pict = data;

  4279.     uint8_t *buf2 = NULL;

  4280. 

  4281.     /* no supplementary picture */

  4282.     if (buf_size == 0) {

  4283.         /* special case for last picture */

  4284.         if (s->low_delay==0 && s->next_picture_ptr) {

  4285.             *pict= *(AVFrame*)s->next_picture_ptr;

  4286.             s->next_picture_ptr= NULL;

  4287. 

  4288.             *data_size = sizeof(AVFrame);

  4289.         }

  4290. 

  4291.         return 0;

  4292.     }

  4293. 

  4294.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  4295.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4296.         int i= ff_find_unused_picture(s, 0);

  4297.         s->current_picture_ptr= &s->picture[i];

  4298.     }

  4299. 

  4300.     //for advanced profile we may need to parse and unescape data

  4301.     if (avctx->codec_id == CODEC_ID_VC1) {

  4302.         int buf_size2 = 0;

  4303.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4304. 

  4305.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4306.             uint8_t *dst = buf2, *start, *end, *next;

  4307.             int size;

  4308. 

  4309.             next = buf;

  4310.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4311.                 next = find_next_marker(start + 4, end);

  4312.                 size = next - start - 4;

  4313.                 if(size <= 0) continue;

  4314.                 switch(AV_RB32(start)){

  4315.                 case VC1_CODE_FRAME:

  4316.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4317.                     break;

  4318.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4319.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4320.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4321.                     decode_entry_point(avctx, &s->gb);

  4322.                     break;

  4323.                 case VC1_CODE_SLICE:

  4324.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4325.                     av_free(buf2);

  4326.                     return -1;

  4327.                 }

  4328.             }

  4329.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4330.             uint8_t *divider;

  4331. 

  4332.             divider = find_next_marker(buf, buf + buf_size);

  4333.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4334.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4335.                 return -1;

  4336.             }

  4337. 

  4338.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4339.             // TODO

  4340.             av_free(buf2);return -1;

  4341.         }else{

  4342.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4343.         }

  4344.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4345.     } else

  4346.         init_get_bits(&s->gb, buf, buf_size*8);

  4347.     // do parse frame header

  4348.     if(v->profile < PROFILE_ADVANCED) {

  4349.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4350.             av_free(buf2);

  4351.             return -1;

  4352.         }

  4353.     } else {

  4354.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4355.             av_free(buf2);

  4356.             return -1;

  4357.         }

  4358.     }

  4359. 

  4360.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4361.         av_free(buf2);

  4362.         return -1;

  4363.     }

  4364. 

  4365.     // for hurry_up==5

  4366.     s->current_picture.pict_type= s->pict_type;

  4367.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4368. 

  4369.     /* skip B-frames if we don't have reference frames */

  4370.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4371.         av_free(buf2);

  4372.         return -1;//buf_size;

  4373.     }

  4374.     /* skip b frames if we are in a hurry */

  4375.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4376.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4377.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4378.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4379.         av_free(buf2);

  4380.         return buf_size;

  4381.     }

  4382.     /* skip everything if we are in a hurry>=5 */

  4383.     if(avctx->hurry_up>=5) {

  4384.         av_free(buf2);

  4385.         return -1;//buf_size;

  4386.     }

  4387. 

  4388.     if(s->next_p_frame_damaged){

  4389.         if(s->pict_type==B_TYPE)

  4390.             return buf_size;

  4391.         else

  4392.             s->next_p_frame_damaged=0;

  4393.     }

  4394. 

  4395.     if(MPV_frame_start(s, avctx) < 0) {

  4396.         av_free(buf2);

  4397.         return -1;

  4398.     }

  4399. 

  4400.     ff_er_frame_start(s);

  4401. 

  4402.     v->bits = buf_size * 8;

  4403.     vc1_decode_blocks(v);

  4404. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4405. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4406. //      return -1;

  4407.     ff_er_frame_end(s);

  4408. 

  4409.     MPV_frame_end(s);

  4410. 

  4411. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4412. assert(s->current_picture.pict_type == s->pict_type);

  4413.     if (s->pict_type == B_TYPE || s->low_delay) {

  4414.         *pict= *(AVFrame*)s->current_picture_ptr;

  4415.     } else if (s->last_picture_ptr != NULL) {

  4416.         *pict= *(AVFrame*)s->last_picture_ptr;

  4417.     }

  4418. 

  4419.     if(s->last_picture_ptr || s->low_delay){

  4420.         *data_size = sizeof(AVFrame);

  4421.         ff_print_debug_info(s, pict);

  4422.     }

  4423. 

  4424.     /* Return the Picture timestamp as the frame number */

  4425.     /* we substract 1 because it is added on utils.c    */

  4426.     avctx->frame_number = s->picture_number - 1;

  4427. 

  4428.     av_free(buf2);

  4429.     return buf_size;

  4430. }

  4431. 

  4432. 

  4433. /** Close a VC1/WMV3 decoder

  4434.  * @warning Initial try at using MpegEncContext stuff

  4435.  */

  4436. static int vc1_decode_end(AVCodecContext *avctx)

  4437. {

  4438.     VC1Context *v = avctx->priv_data;

  4439. 

  4440.     av_freep(&v->hrd_rate);

  4441.     av_freep(&v->hrd_buffer);

  4442.     MPV_common_end(&v->s);

  4443.     av_freep(&v->mv_type_mb_plane);

  4444.     av_freep(&v->direct_mb_plane);

  4445.     av_freep(&v->acpred_plane);

  4446.     av_freep(&v->over_flags_plane);

  4447.     av_freep(&v->mb_type_base);

  4448.     return 0;

  4449. }

  4450. 

  4451. 

  4452. AVCodec vc1_decoder = {

  4453.     "vc1",

  4454.     CODEC_TYPE_VIDEO,

  4455.     CODEC_ID_VC1,

  4456.     sizeof(VC1Context),

  4457.     vc1_decode_init,

  4458.     NULL,

  4459.     vc1_decode_end,

  4460.     vc1_decode_frame,

  4461.     CODEC_CAP_DELAY,

  4462.     NULL

  4463. };

  4464. 

  4465. AVCodec wmv3_decoder = {

  4466.     "wmv3",

  4467.     CODEC_TYPE_VIDEO,

  4468.     CODEC_ID_WMV3,

  4469.     sizeof(VC1Context),

  4470.     vc1_decode_init,

  4471.     NULL,

  4472.     vc1_decode_end,

  4473.     vc1_decode_frame,

  4474.     CODEC_CAP_DELAY,

  4475.     NULL

  4476. };

  4477. 

  4478. #ifdef CONFIG_VC1_PARSER

  4479. /**

  4480.  * finds the end of the current frame in the bitstream.

  4481.  * @return the position of the first byte of the next frame, or -1

  4482.  */

  4483. static int vc1_find_frame_end(ParseContext *pc, const uint8_t *buf,

  4484.                                int buf_size) {

  4485.     int pic_found, i;

  4486.     uint32_t state;

  4487. 

  4488.     pic_found= pc->frame_start_found;

  4489.     state= pc->state;

  4490. 

  4491.     i=0;

  4492.     if(!pic_found){

  4493.         for(i=0; i<buf_size; i++){

  4494.             state= (state<<8) | buf[i];

  4495.             if(state == VC1_CODE_FRAME || state == VC1_CODE_FIELD){

  4496.                 i++;

  4497.                 pic_found=1;

  4498.                 break;

  4499.             }

  4500.         }

  4501.     }

  4502. 

  4503.     if(pic_found){

  4504.         /* EOF considered as end of frame */

  4505.         if (buf_size == 0)

  4506.             return 0;

  4507.         for(; i<buf_size; i++){

  4508.             state= (state<<8) | buf[i];

  4509.             if(IS_MARKER(state) && state != VC1_CODE_FIELD && state != VC1_CODE_SLICE){

  4510.                 pc->frame_start_found=0;

  4511.                 pc->state=-1;

  4512.                 return i-3;

  4513.             }

  4514.         }

  4515.     }

  4516.     pc->frame_start_found= pic_found;

  4517.     pc->state= state;

  4518.     return END_NOT_FOUND;

  4519. }

  4520. 

  4521. static int vc1_parse(AVCodecParserContext *s,

  4522.                            AVCodecContext *avctx,

  4523.                            uint8_t **poutbuf, int *poutbuf_size,

  4524.                            const uint8_t *buf, int buf_size)

  4525. {

  4526.     ParseContext *pc = s->priv_data;

  4527.     int next;

  4528. 

  4529.     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){

  4530.         next= buf_size;

  4531.     }else{

  4532.         next= vc1_find_frame_end(pc, buf, buf_size);

  4533. 

  4534.         if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {

  4535.             *poutbuf = NULL;

  4536.             *poutbuf_size = 0;

  4537.             return buf_size;

  4538.         }

  4539.     }

  4540.     *poutbuf = (uint8_t *)buf;

  4541.     *poutbuf_size = buf_size;

  4542.     return next;

  4543. }

  4544. 

  4545. int vc1_split(AVCodecContext *avctx,

  4546.                            const uint8_t *buf, int buf_size)

  4547. {

  4548.     int i;

  4549.     uint32_t state= -1;

  4550. 

  4551.     for(i=0; i<buf_size; i++){

  4552.         state= (state<<8) | buf[i];

  4553.         if(IS_MARKER(state) && state != VC1_CODE_SEQHDR && state != VC1_CODE_ENTRYPOINT)

  4554.             return i-3;

  4555.     }

  4556.     return 0;

  4557. }

  4558. 

  4559. AVCodecParser vc1_parser = {

  4560.     { CODEC_ID_VC1 },

  4561.     sizeof(ParseContext1),

  4562.     NULL,

  4563.     vc1_parse,

  4564.     ff_parse1_close,

  4565.     vc1_split,

  4566. };

  4567. #endif /* CONFIG_VC1_PARSER */