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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_ESCAPE     = 0x00000103,

  54.     VC1_CODE_ENDOFSEQ   = 0x0000010A,

  55.     VC1_CODE_SLICE,

  56.     VC1_CODE_FIELD,

  57.     VC1_CODE_FRAME,

  58.     VC1_CODE_ENTRYPOINT,

  59.     VC1_CODE_SEQHDR,

  60. };

  61. //@}

  62. 

  63. /** Available Profiles */

  64. //@{

  65. enum Profile {

  66.     PROFILE_SIMPLE,

  67.     PROFILE_MAIN,

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

  69.     PROFILE_ADVANCED

  70. };

  71. //@}

  72. 

  73. /** Sequence quantizer mode */

  74. //@{

  75. enum QuantMode {

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

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

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

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

  80. };

  81. //@}

  82. 

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

  84. //@{

  85. enum DQProfile {

  86.     DQPROFILE_FOUR_EDGES,

  87.     DQPROFILE_DOUBLE_EDGES,

  88.     DQPROFILE_SINGLE_EDGE,

  89.     DQPROFILE_ALL_MBS

  90. };

  91. //@}

  92. 

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

  94.  */

  95. //@{

  96. enum DQSingleEdge {

  97.     DQSINGLE_BEDGE_LEFT,

  98.     DQSINGLE_BEDGE_TOP,

  99.     DQSINGLE_BEDGE_RIGHT,

  100.     DQSINGLE_BEDGE_BOTTOM

  101. };

  102. //@}

  103. 

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

  105. //@{

  106. enum DQDoubleEdge {

  107.     DQDOUBLE_BEDGE_TOPLEFT,

  108.     DQDOUBLE_BEDGE_TOPRIGHT,

  109.     DQDOUBLE_BEDGE_BOTTOMRIGHT,

  110.     DQDOUBLE_BEDGE_BOTTOMLEFT

  111. };

  112. //@}

  113. 

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

  115. //@{

  116. enum MVModes {

  117.     MV_PMODE_1MV_HPEL_BILIN,

  118.     MV_PMODE_1MV,

  119.     MV_PMODE_1MV_HPEL,

  120.     MV_PMODE_MIXED_MV,

  121.     MV_PMODE_INTENSITY_COMP

  122. };

  123. //@}

  124. 

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

  126. //@{

  127. enum BMVTypes {

  128.     BMV_TYPE_BACKWARD,

  129.     BMV_TYPE_FORWARD,

  130.     BMV_TYPE_INTERPOLATED

  131. };

  132. //@}

  133. 

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

  135. //@{

  136. enum TransformTypes {

  137.     TT_8X8,

  138.     TT_8X4_BOTTOM,

  139.     TT_8X4_TOP,

  140.     TT_8X4, //Both halves

  141.     TT_4X8_RIGHT,

  142.     TT_4X8_LEFT,

  143.     TT_4X8, //Both halves

  144.     TT_4X4

  145. };

  146. //@}

  147. 

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

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

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

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

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

  153. };

  154. 

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

  156. 

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

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

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

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

  161. };

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

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

  164.   { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN }

  165. };

  166. 

  167. /** One more frame type */

  168. #define BI_TYPE 7

  169. 

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

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

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

  173.   {  /* Implicit quantizer */

  174.      0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,

  175.     13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31

  176.   },

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

  178.      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  179.     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

  180.   },

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

  182.      0,  1,  1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,

  183.     14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31

  184.   }

  185. };

  186. 

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

  188.  *  @todo TODO move this into the context

  189.  */

  190. //@{

  191. #define VC1_BFRACTION_VLC_BITS 7

  192. static VLC vc1_bfraction_vlc;

  193. #define VC1_IMODE_VLC_BITS 4

  194. static VLC vc1_imode_vlc;

  195. #define VC1_NORM2_VLC_BITS 3

  196. static VLC vc1_norm2_vlc;

  197. #define VC1_NORM6_VLC_BITS 9

  198. static VLC vc1_norm6_vlc;

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

  200. #define VC1_TTMB_VLC_BITS 9 //12

  201. static VLC vc1_ttmb_vlc[3];

  202. #define VC1_MV_DIFF_VLC_BITS 9 //15

  203. static VLC vc1_mv_diff_vlc[4];

  204. #define VC1_CBPCY_P_VLC_BITS 9 //14

  205. static VLC vc1_cbpcy_p_vlc[4];

  206. #define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6

  207. static VLC vc1_4mv_block_pattern_vlc[4];

  208. #define VC1_TTBLK_VLC_BITS 5

  209. static VLC vc1_ttblk_vlc[3];

  210. #define VC1_SUBBLKPAT_VLC_BITS 6

  211. static VLC vc1_subblkpat_vlc[3];

  212. 

  213. static VLC vc1_ac_coeff_table[8];

  214. //@}

  215. 

  216. enum CodingSet {

  217.     CS_HIGH_MOT_INTRA = 0,

  218.     CS_HIGH_MOT_INTER,

  219.     CS_LOW_MOT_INTRA,

  220.     CS_LOW_MOT_INTER,

  221.     CS_MID_RATE_INTRA,

  222.     CS_MID_RATE_INTER,

  223.     CS_HIGH_RATE_INTRA,

  224.     CS_HIGH_RATE_INTER

  225. };

  226. 

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

  228. //@{

  229. enum COTypes {

  230.     CONDOVER_NONE = 0,

  231.     CONDOVER_ALL,

  232.     CONDOVER_SELECT

  233. };

  234. //@}

  235. 

  236. 

  237. /** The VC1 Context

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

  239.  * Many members are only used for Advanced Profile

  240.  */

  241. typedef struct VC1Context{

  242.     MpegEncContext s;

  243. 

  244.     int bits;

  245. 

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

  247.     //@{

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

  249.     int res_x8;           ///< reserved

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

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

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

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

  254.                           ///< at frame level

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

  256.     int reserved;         ///< reserved

  257.     //@}

  258. 

  259.     /** Advanced Profile */

  260.     //@{

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

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

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

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

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

  266.     int tfcntrflag;       ///< TFCNTR present

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

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

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

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

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

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

  273.                           ///< Decoder parameters

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

  275.     //@}

  276. 

  277.     /** Sequence header data for all Profiles

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

  279.      */

  280.     //@{

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

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

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

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

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

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

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

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

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

  290.     int finterpflag;      ///< INTERPFRM present

  291.     //@}

  292. 

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

  294.     //@{

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

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

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

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

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

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

  301.     /** pquant parameters */

  302.     //@{

  303.     uint8_t dquantfrm;

  304.     uint8_t dqprofile;

  305.     uint8_t dqsbedge;

  306.     uint8_t dqbilevel;

  307.     //@}

  308.     /** AC coding set indexes

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

  310.      */

  311.     //@{

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

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

  314.     //@}

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

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

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

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

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

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

  321.     int a_avail, c_avail;

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

  323. 

  324. 

  325.     /** Luma compensation parameters */

  326.     //@{

  327.     uint8_t lumscale;

  328.     uint8_t lumshift;

  329.     //@}

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

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

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

  333.     int buffer_fullness;  ///< HRD info

  334.     /** Ranges:

  335.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  336.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  337.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  338.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  339.      */

  340.     uint8_t mvrange;

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

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

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

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

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

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

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

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

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

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

  351.     int rnd;                      ///< rounding control

  352. 

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

  354.     //@{

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

  356.     uint8_t interpfrm;

  357.     //@}

  358. 

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

  360.     //@{

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

  362.     uint8_t numpanscanwin;

  363.     uint8_t tfcntr;

  364.     uint8_t rptfrm, tff, rff;

  365.     uint16_t topleftx;

  366.     uint16_t toplefty;

  367.     uint16_t bottomrightx;

  368.     uint16_t bottomrighty;

  369.     uint8_t uvsamp;

  370.     uint8_t postproc;

  371.     int hrd_num_leaky_buckets;

  372.     uint8_t bit_rate_exponent;

  373.     uint8_t buffer_size_exponent;

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

  375.     int acpred_is_raw;

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

  377.     int overflg_is_raw;

  378.     uint8_t condover;

  379.     uint16_t *hrd_rate, *hrd_buffer;

  380.     uint8_t *hrd_fullness;

  381.     uint8_t range_mapy_flag;

  382.     uint8_t range_mapuv_flag;

  383.     uint8_t range_mapy;

  384.     uint8_t range_mapuv;

  385.     //@}

  386. 

  387.     int p_frame_skipped;

  388.     int bi_type;

  389. } VC1Context;

  390. 

  391. /**

  392.  * Get unary code of limited length

  393.  * @fixme FIXME Slow and ugly

  394.  * @param gb GetBitContext

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

  396.  * @param[in] len Maximum length

  397.  * @return Unary length/index

  398.  */

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

  400. {

  401. #if 1

  402.     int i;

  403. 

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

  405.     return i;

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

  407. 

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

  409.   {

  410.     tmp = get_bits(gb, 1);

  411.     i++;

  412.   }

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

  414.   return i;*/

  415. #else

  416.   unsigned int buf;

  417.   int log;

  418. 

  419.   OPEN_READER(re, gb);

  420.   UPDATE_CACHE(re, gb);

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

  422.   if (stop) buf = ~buf;

  423. 

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

  425.   if (log < limit){

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

  427.     CLOSE_READER(re, gb);

  428.     return log;

  429.   }

  430. 

  431.   LAST_SKIP_BITS(re, gb, limit);

  432.   CLOSE_READER(re, gb);

  433.   return limit;

  434. #endif

  435. }

  436. 

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

  438.     int n;

  439.     n = get_bits1(gb);

  440.     if (n == 1)

  441.         return 0;

  442.     else

  443.         return 2 - get_bits1(gb);

  444. }

  445. 

  446. /**

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

  448.  * @param v The VC1Context to initialize

  449.  * @return Status

  450.  */

  451. static int vc1_init_common(VC1Context *v)

  452. {

  453.     static int done = 0;

  454.     int i = 0;

  455. 

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

  457. 

  458.     /* VLC tables */

  459.     if(!done)

  460.     {

  461.         done = 1;

  462.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  463.                  vc1_bfraction_bits, 1, 1,

  464.                  vc1_bfraction_codes, 1, 1, 1);

  465.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  466.                  vc1_norm2_bits, 1, 1,

  467.                  vc1_norm2_codes, 1, 1, 1);

  468.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  469.                  vc1_norm6_bits, 1, 1,

  470.                  vc1_norm6_codes, 2, 2, 1);

  471.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  472.                  vc1_imode_bits, 1, 1,

  473.                  vc1_imode_codes, 1, 1, 1);

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

  475.         {

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

  477.                      vc1_ttmb_bits[i], 1, 1,

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

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

  480.                      vc1_ttblk_bits[i], 1, 1,

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

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

  483.                      vc1_subblkpat_bits[i], 1, 1,

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

  485.         }

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

  487.         {

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

  489.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  492.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  495.                      vc1_mv_diff_bits[i], 1, 1,

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

  497.         }

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

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

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

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

  502.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  505.     }

  506. 

  507.     /* Other defaults */

  508.     v->pq = -1;

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

  510. 

  511.     return 0;

  512. }

  513. 

  514. /***********************************************************************/

  515. /**

  516.  * @defgroup bitplane VC9 Bitplane decoding

  517.  * @see 8.7, p56

  518.  * @{

  519.  */

  520. 

  521. /** @addtogroup bitplane

  522.  * Imode types

  523.  * @{

  524.  */

  525. enum Imode {

  526.     IMODE_RAW,

  527.     IMODE_NORM2,

  528.     IMODE_DIFF2,

  529.     IMODE_NORM6,

  530.     IMODE_DIFF6,

  531.     IMODE_ROWSKIP,

  532.     IMODE_COLSKIP

  533. };

  534. /** @} */ //imode defines

  535. 

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

  537.  * @param plane Buffer to store decoded bits

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

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

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

  541.  */

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

  543.     int x, y;

  544. 

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

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

  547.             memset(plane, 0, width);

  548.         else

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

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

  551.         plane += stride;

  552.     }

  553. }

  554. 

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

  556.  * @param plane Buffer to store decoded bits

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

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

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

  560.  * @fixme FIXME: Optimize

  561.  */

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

  563.     int x, y;

  564. 

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

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

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

  568.                 plane[y*stride] = 0;

  569.         else

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

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

  572.         plane ++;

  573.     }

  574. }

  575. 

  576. /** Decode a bitplane's bits

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

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

  579.  * @return Status

  580.  * @fixme FIXME: Optimize

  581.  */

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

  583. {

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

  585. 

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

  587.     uint8_t invert, *planep = data;

  588.     int width, height, stride;

  589. 

  590.     width = v->s.mb_width;

  591.     height = v->s.mb_height;

  592.     stride = v->s.mb_stride;

  593.     invert = get_bits(gb, 1);

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

  595. 

  596.     *raw_flag = 0;

  597.     switch (imode)

  598.     {

  599.     case IMODE_RAW:

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

  601.         *raw_flag = 1; //invert ignored

  602.         return invert;

  603.     case IMODE_DIFF2:

  604.     case IMODE_NORM2:

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

  606.         {

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

  608.             offset = 1;

  609.         }

  610.         else offset = 0;

  611.         // decode bitplane as one long line

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

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

  614.             *planep++ = code & 1;

  615.             offset++;

  616.             if(offset == width) {

  617.                 offset = 0;

  618.                 planep += stride - width;

  619.             }

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

  621.             offset++;

  622.             if(offset == width) {

  623.                 offset = 0;

  624.                 planep += stride - width;

  625.             }

  626.         }

  627.         break;

  628.     case IMODE_DIFF6:

  629.     case IMODE_NORM6:

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

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

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

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

  634.                     if(code < 0){

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

  636.                         return -1;

  637.                     }

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

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

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

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

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

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

  644.                 }

  645.                 planep += stride * 3;

  646.             }

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

  648.         } else { // 3x2

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

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

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

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

  653.                     if(code < 0){

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

  655.                         return -1;

  656.                     }

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

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

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

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

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

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

  663.                 }

  664.                 planep += stride * 2;

  665.             }

  666.             x = width % 3;

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

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

  669.         }

  670.         break;

  671.     case IMODE_ROWSKIP:

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

  673.         break;

  674.     case IMODE_COLSKIP:

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

  676.         break;

  677.     default: break;

  678.     }

  679. 

  680.     /* Applying diff operator */

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

  682.     {

  683.         planep = data;

  684.         planep[0] ^= invert;

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

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

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

  688.         {

  689.             planep += stride;

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

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

  692.             {

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

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

  695.             }

  696.         }

  697.     }

  698.     else if (invert)

  699.     {

  700.         planep = data;

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

  702.     }

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

  704. }

  705. 

  706. /** @} */ //Bitplane group

  707. 

  708. /***********************************************************************/

  709. /** VOP Dquant decoding

  710.  * @param v VC-1 Context

  711.  */

  712. static int vop_dquant_decoding(VC1Context *v)

  713. {

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

  715.     int pqdiff;

  716. 

  717.     //variable size

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

  719.     {

  720.         pqdiff = get_bits(gb, 3);

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

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

  723.     }

  724.     else

  725.     {

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

  727.         if ( v->dquantfrm )

  728.         {

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

  730.             switch (v->dqprofile)

  731.             {

  732.             case DQPROFILE_SINGLE_EDGE:

  733.             case DQPROFILE_DOUBLE_EDGES:

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

  735.                 break;

  736.             case DQPROFILE_ALL_MBS:

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

  738.             default: break; //Forbidden ?

  739.             }

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

  741.             {

  742.                 pqdiff = get_bits(gb, 3);

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

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

  745.             }

  746.         }

  747.     }

  748.     return 0;

  749. }

  750. 

  751. /** Put block onto picture

  752.  */

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

  754. {

  755.     uint8_t *Y;

  756.     int ys, us, vs;

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

  758. 

  759.     if(v->rangeredfrm) {

  760.         int i, j, k;

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

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

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

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

  765. 

  766.     }

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

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

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

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

  771. 

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

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

  774.     Y += ys * 8;

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

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

  777. 

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

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

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

  781.     }

  782. }

  783. 

  784. /** Do motion compensation over 1 macroblock

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

  786.  */

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

  788. {

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

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

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

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

  793. 

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

  795. 

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

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

  798. 

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

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

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

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

  803.     }

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

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

  806.     if(v->fastuvmc) {

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

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

  809.     }

  810.     if(!dir) {

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

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

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

  814.     } else {

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

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

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

  818.     }

  819. 

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

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

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

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

  824. 

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

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

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

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

  829. 

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

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

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

  833. 

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

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

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

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

  838.     }

  839. 

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

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

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

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

  844. 

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

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

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

  848.         srcY = s->edge_emu_buffer;

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

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

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

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

  853.         srcU = uvbuf;

  854.         srcV = uvbuf + 16;

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

  856.         if(v->rangeredfrm) {

  857.             int i, j;

  858.             uint8_t *src, *src2;

  859. 

  860.             src = srcY;

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

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

  863.                 src += s->linesize;

  864.             }

  865.             src = srcU; src2 = srcV;

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

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

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

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

  870.                 }

  871.                 src += s->uvlinesize;

  872.                 src2 += s->uvlinesize;

  873.             }

  874.         }

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

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

  877.             int i, j;

  878.             uint8_t *src, *src2;

  879. 

  880.             src = srcY;

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

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

  883.                 src += s->linesize;

  884.             }

  885.             src = srcU; src2 = srcV;

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

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

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

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

  890.                 }

  891.                 src += s->uvlinesize;

  892.                 src2 += s->uvlinesize;

  893.             }

  894.         }

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

  896.     }

  897. 

  898.     if(s->mspel) {

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

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

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

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

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

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

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

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

  907. 

  908.         if(!v->rnd)

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

  910.         else

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

  912.     }

  913. 

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

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

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

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

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

  919.     if(!v->rnd){

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

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

  922.     }else{

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

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

  925.     }

  926. }

  927. 

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

  929.  */

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

  931. {

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

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

  934.     uint8_t *srcY;

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

  936.     int off;

  937. 

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

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

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

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

  942. 

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

  944. 

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

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

  947. 

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

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

  950. 

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

  952. 

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

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

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

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

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

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

  959.         srcY = s->edge_emu_buffer;

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

  961.         if(v->rangeredfrm) {

  962.             int i, j;

  963.             uint8_t *src;

  964. 

  965.             src = srcY;

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

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

  968.                 src += s->linesize;

  969.             }

  970.         }

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

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

  973.             int i, j;

  974.             uint8_t *src;

  975. 

  976.             src = srcY;

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

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

  979.                 src += s->linesize;

  980.             }

  981.         }

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

  983.     }

  984. 

  985.     if(s->mspel) {

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

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

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

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

  990.         if(!v->rnd)

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

  992.         else

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

  994.     }

  995. }

  996. 

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

  998. {

  999.     if(a < b) {

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

  1001.         else      return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  1002.     } else {

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

  1004.         else      return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  1005.     }

  1006. }

  1007. 

  1008. 

  1009. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1010.  */

  1011. static void vc1_mc_4mv_chroma(VC1Context *v)

  1012. {

  1013.     MpegEncContext *s = &v->s;

  1014.     DSPContext *dsp = &v->s.dsp;

  1015.     uint8_t *srcU, *srcV;

  1016.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1017.     int i, idx, tx = 0, ty = 0;

  1018.     int mvx[4], mvy[4], intra[4];

  1019.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1020. 

  1021.     if(!v->s.last_picture.data[0])return;

  1022.     if(s->flags & CODEC_FLAG_GRAY) return;

  1023. 

  1024.     for(i = 0; i < 4; i++) {

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

  1026.         mvy[i] = s->mv[0][i][1];

  1027.         intra[i] = v->mb_type[0][s->block_index[i]];

  1028.     }

  1029. 

  1030.     /* calculate chroma MV vector from four luma MVs */

  1031.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  1032.     if(!idx) { // all blocks are inter

  1033.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1034.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1035.     } else if(count[idx] == 1) { // 3 inter blocks

  1036.         switch(idx) {

  1037.         case 0x1:

  1038.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1039.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1040.             break;

  1041.         case 0x2:

  1042.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1043.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1044.             break;

  1045.         case 0x4:

  1046.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1047.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1048.             break;

  1049.         case 0x8:

  1050.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1051.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1052.             break;

  1053.         }

  1054.     } else if(count[idx] == 2) {

  1055.         int t1 = 0, t2 = 0;

  1056.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1057.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1058.         tx = (mvx[t1] + mvx[t2]) / 2;

  1059.         ty = (mvy[t1] + mvy[t2]) / 2;

  1060.     } else

  1061.         return; //no need to do MC for inter blocks

  1062. 

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

  1064.     s->current_picture.motion_val[1][s->block_index[0]][1] = ty;

  1065.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1066.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1067.     if(v->fastuvmc) {

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

  1069.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1070.     }

  1071. 

  1072.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1073.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1074. 

  1075.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  1076.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  1077.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1078.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1079.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1080.        || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  1081.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){

  1082.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1083.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1084.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1085.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1086.         srcU = s->edge_emu_buffer;

  1087.         srcV = s->edge_emu_buffer + 16;

  1088. 

  1089.         /* if we deal with range reduction we need to scale source blocks */

  1090.         if(v->rangeredfrm) {

  1091.             int i, j;

  1092.             uint8_t *src, *src2;

  1093. 

  1094.             src = srcU; src2 = srcV;

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

  1096.                 for(i = 0; i < 9; i++) {

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

  1098.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1099.                 }

  1100.                 src += s->uvlinesize;

  1101.                 src2 += s->uvlinesize;

  1102.             }

  1103.         }

  1104.         /* if we deal with intensity compensation we need to scale source blocks */

  1105.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1106.             int i, j;

  1107.             uint8_t *src, *src2;

  1108. 

  1109.             src = srcU; src2 = srcV;

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

  1111.                 for(i = 0; i < 9; i++) {

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

  1113.                     src2[i] = v->lutuv[src2[i]];

  1114.                 }

  1115.                 src += s->uvlinesize;

  1116.                 src2 += s->uvlinesize;

  1117.             }

  1118.         }

  1119.     }

  1120. 

  1121.     /* Chroma MC always uses qpel bilinear */

  1122.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

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

  1124.     uvmy = (uvmy&3)<<1;

  1125.     if(!v->rnd){

  1126.         dsp->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1127.         dsp->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1128.     }else{

  1129.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1130.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1131.     }

  1132. }

  1133. 

  1134. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);

  1135. 

  1136. /**

  1137.  * Decode Simple/Main Profiles sequence header

  1138.  * @see Figure 7-8, p16-17

  1139.  * @param avctx Codec context

  1140.  * @param gb GetBit context initialized from Codec context extra_data

  1141.  * @return Status

  1142.  */

  1143. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1144. {

  1145.     VC1Context *v = avctx->priv_data;

  1146. 

  1147.     av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));

  1148.     v->profile = get_bits(gb, 2);

  1149.     if (v->profile == 2)

  1150.     {

  1151.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1152.         return -1;

  1153.     }

  1154. 

  1155.     if (v->profile == PROFILE_ADVANCED)

  1156.     {

  1157.         return decode_sequence_header_adv(v, gb);

  1158.     }

  1159.     else

  1160.     {

  1161.         v->res_sm = get_bits(gb, 2); //reserved

  1162.         if (v->res_sm)

  1163.         {

  1164.             av_log(avctx, AV_LOG_ERROR,

  1165.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1166.             return -1;

  1167.         }

  1168.     }

  1169. 

  1170.     // (fps-2)/4 (->30)

  1171.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1172.     // (bitrate-32kbps)/64kbps

  1173.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1174.     v->s.loop_filter = get_bits(gb, 1); //common

  1175.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1176.     {

  1177.         av_log(avctx, AV_LOG_ERROR,

  1178.                "LOOPFILTER shell not be enabled in simple profile\n");

  1179.     }

  1180. 

  1181.     v->res_x8 = get_bits(gb, 1); //reserved

  1182.     if (v->res_x8)

  1183.     {

  1184.         av_log(avctx, AV_LOG_ERROR,

  1185.                "1 for reserved RES_X8 is forbidden\n");

  1186.         //return -1;

  1187.     }

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

  1189.     v->res_fasttx = get_bits(gb, 1);

  1190.     if (!v->res_fasttx)

  1191.     {

  1192.         av_log(avctx, AV_LOG_ERROR,

  1193.                "0 for reserved RES_FASTTX is forbidden\n");

  1194.         //return -1;

  1195.     }

  1196. 

  1197.     v->fastuvmc =  get_bits(gb, 1); //common

  1198.     if (!v->profile && !v->fastuvmc)

  1199.     {

  1200.         av_log(avctx, AV_LOG_ERROR,

  1201.                "FASTUVMC unavailable in Simple Profile\n");

  1202.         return -1;

  1203.     }

  1204.     v->extended_mv =  get_bits(gb, 1); //common

  1205.     if (!v->profile && v->extended_mv)

  1206.     {

  1207.         av_log(avctx, AV_LOG_ERROR,

  1208.                "Extended MVs unavailable in Simple Profile\n");

  1209.         return -1;

  1210.     }

  1211.     v->dquant =  get_bits(gb, 2); //common

  1212.     v->vstransform =  get_bits(gb, 1); //common

  1213. 

  1214.     v->res_transtab = get_bits(gb, 1);

  1215.     if (v->res_transtab)

  1216.     {

  1217.         av_log(avctx, AV_LOG_ERROR,

  1218.                "1 for reserved RES_TRANSTAB is forbidden\n");

  1219.         return -1;

  1220.     }

  1221. 

  1222.     v->overlap = get_bits(gb, 1); //common

  1223. 

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

  1225.     v->rangered = get_bits(gb, 1);

  1226.     if (v->rangered && v->profile == PROFILE_SIMPLE)

  1227.     {

  1228.         av_log(avctx, AV_LOG_INFO,

  1229.                "RANGERED should be set to 0 in simple profile\n");

  1230.     }

  1231. 

  1232.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1233.     v->quantizer_mode = get_bits(gb, 2); //common

  1234. 

  1235.     v->finterpflag = get_bits(gb, 1); //common

  1236.     v->res_rtm_flag = get_bits(gb, 1); //reserved

  1237.     if (!v->res_rtm_flag)

  1238.     {

  1239. //            av_log(avctx, AV_LOG_ERROR,

  1240. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  1241.         av_log(avctx, AV_LOG_ERROR,

  1242.                "Old WMV3 version detected, only I-frames will be decoded\n");

  1243.         //return -1;

  1244.     }

  1245.     av_log(avctx, AV_LOG_DEBUG,

  1246.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1247.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  1248.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1249.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1250.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1251.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1252.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1253.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1254.                );

  1255.     return 0;

  1256. }

  1257. 

  1258. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)

  1259. {

  1260.     v->res_rtm_flag = 1;

  1261.     v->level = get_bits(gb, 3);

  1262.     if(v->level >= 5)

  1263.     {

  1264.         av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1265.     }

  1266.     v->chromaformat = get_bits(gb, 2);

  1267.     if (v->chromaformat != 1)

  1268.     {

  1269.         av_log(v->s.avctx, AV_LOG_ERROR,

  1270.                "Only 4:2:0 chroma format supported\n");

  1271.         return -1;

  1272.     }

  1273. 

  1274.     // (fps-2)/4 (->30)

  1275.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1276.     // (bitrate-32kbps)/64kbps

  1277.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1278.     v->postprocflag = get_bits(gb, 1); //common

  1279. 

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

  1281.     v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;

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

  1283.     v->interlace = get_bits1(gb);

  1284.     if(v->interlace){

  1285.         av_log(v->s.avctx, AV_LOG_ERROR, "Interlaced mode not supported (yet)\n");

  1286.         return -1;

  1287.     }

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

  1289.     v->finterpflag = get_bits1(gb);

  1290.     get_bits1(gb); // reserved

  1291. 

  1292.     av_log(v->s.avctx, AV_LOG_DEBUG,

  1293.                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1294.                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"

  1295.                "TFCTRflag=%i, FINTERPflag=%i\n",

  1296.                v->level, v->frmrtq_postproc, v->bitrtq_postproc,

  1297.                v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,

  1298.                v->tfcntrflag, v->finterpflag

  1299.                );

  1300. 

  1301.     v->psf = get_bits1(gb);

  1302.     if(v->psf) { //PsF, 6.1.13

  1303.         av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");

  1304.         return -1;

  1305.     }

  1306.     if(get_bits1(gb)) { //Display Info - decoding is not affected by it

  1307.         int w, h, ar = 0;

  1308.         av_log(v->s.avctx, AV_LOG_INFO, "Display extended info:\n");

  1309.         w = get_bits(gb, 14) + 1;

  1310.         h = get_bits(gb, 14) + 1;

  1311.         av_log(v->s.avctx, AV_LOG_INFO, "Display dimensions: %ix%i\n", w, h);

  1312.         if(get_bits1(gb))

  1313.             ar = get_bits(gb, 4);

  1314.         if(ar && ar < 14){

  1315.             v->s.avctx->sample_aspect_ratio = vc1_pixel_aspect[ar];

  1316.         }else if(ar == 15){

  1317.             w = get_bits(gb, 8);

  1318.             h = get_bits(gb, 8);

  1319.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  1320.         }

  1321. 

  1322.         if(get_bits1(gb)){ //framerate stuff

  1323.             if(get_bits1(gb)) {

  1324.                 get_bits(gb, 16);

  1325.             } else {

  1326.                 get_bits(gb, 8);

  1327.                 get_bits(gb, 4);

  1328.             }

  1329.         }

  1330. 

  1331.         if(get_bits1(gb)){

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

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

  1334.             v->matrix_coef = get_bits(gb, 8);

  1335.         }

  1336.     }

  1337. 

  1338.     v->hrd_param_flag = get_bits1(gb);

  1339.     if(v->hrd_param_flag) {

  1340.         int i;

  1341.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1342.         get_bits(gb, 4); //bitrate exponent

  1343.         get_bits(gb, 4); //buffer size exponent

  1344.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

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

  1346.             get_bits(gb, 16); //hrd_buffer[n]

  1347.         }

  1348.     }

  1349.     return 0;

  1350. }

  1351. 

  1352. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1353. {

  1354.     VC1Context *v = avctx->priv_data;

  1355.     int i, blink, refdist;

  1356. 

  1357.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1358.     blink = get_bits1(gb); // broken link

  1359.     avctx->max_b_frames = 1 - get_bits1(gb); // 'closed entry' also signalize possible B-frames

  1360.     v->panscanflag = get_bits1(gb);

  1361.     refdist = get_bits1(gb); // refdist flag

  1362.     v->s.loop_filter = get_bits1(gb);

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

  1364.     v->extended_mv = get_bits1(gb);

  1365.     v->dquant = get_bits(gb, 2);

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

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

  1368.     v->quantizer_mode = get_bits(gb, 2);

  1369. 

  1370.     if(v->hrd_param_flag){

  1371.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1372.             get_bits(gb, 8); //hrd_full[n]

  1373.         }

  1374.     }

  1375. 

  1376.     if(get_bits1(gb)){

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

  1378.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1379.     }

  1380.     if(v->extended_mv)

  1381.         v->extended_dmv = get_bits1(gb);

  1382.     if(get_bits1(gb)) {

  1383.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1384.         skip_bits(gb, 3); // Y range, ignored for now

  1385.     }

  1386.     if(get_bits1(gb)) {

  1387.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1388.         skip_bits(gb, 3); // UV range, ignored for now

  1389.     }

  1390. 

  1391.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1392.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1393.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1394.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1395.         blink, 1 - avctx->max_b_frames, v->panscanflag, refdist, v->s.loop_filter,

  1396.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1397. 

  1398.     return 0;

  1399. }

  1400. 

  1401. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1402. {

  1403.     int pqindex, lowquant, status;

  1404. 

  1405.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1406.     skip_bits(gb, 2); //framecnt unused

  1407.     v->rangeredfrm = 0;

  1408.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1409.     v->s.pict_type = get_bits(gb, 1);

  1410.     if (v->s.avctx->max_b_frames) {

  1411.         if (!v->s.pict_type) {

  1412.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1413.             else v->s.pict_type = B_TYPE;

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

  1415.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1416. 

  1417.     v->bi_type = 0;

  1418.     if(v->s.pict_type == B_TYPE) {

  1419.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1420.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1421.         if(v->bfraction == 0) {

  1422.             v->s.pict_type = BI_TYPE;

  1423.         }

  1424.     }

  1425.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1426.         get_bits(gb, 7); // skip buffer fullness

  1427. 

  1428.     /* calculate RND */

  1429.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1430.         v->rnd = 1;

  1431.     if(v->s.pict_type == P_TYPE)

  1432.         v->rnd ^= 1;

  1433. 

  1434.     /* Quantizer stuff */

  1435.     pqindex = get_bits(gb, 5);

  1436.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1437.         v->pq = pquant_table[0][pqindex];

  1438.     else

  1439.         v->pq = pquant_table[1][pqindex];

  1440. 

  1441.     v->pquantizer = 1;

  1442.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1443.         v->pquantizer = pqindex < 9;

  1444.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1445.         v->pquantizer = 0;

  1446.     v->pqindex = pqindex;

  1447.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1448.     else v->halfpq = 0;

  1449.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1450.         v->pquantizer = get_bits(gb, 1);

  1451.     v->dquantfrm = 0;

  1452.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1453.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1454.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1455.     v->range_x = 1 << (v->k_x - 1);

  1456.     v->range_y = 1 << (v->k_y - 1);

  1457.     if (v->profile == PROFILE_ADVANCED)

  1458.     {

  1459.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1460.     }

  1461.     else

  1462.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1463. 

  1464. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1465. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1466. 

  1467.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1468. 

  1469.     switch(v->s.pict_type) {

  1470.     case P_TYPE:

  1471.         if (v->pq < 5) v->tt_index = 0;

  1472.         else if(v->pq < 13) v->tt_index = 1;

  1473.         else v->tt_index = 2;

  1474. 

  1475.         lowquant = (v->pq > 12) ? 0 : 1;

  1476.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1477.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1478.         {

  1479.             int scale, shift, i;

  1480.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1482.             v->lumshift = get_bits(gb, 6);

  1483.             v->use_ic = 1;

  1484.             /* fill lookup tables for intensity compensation */

  1485.             if(!v->lumscale) {

  1486.                 scale = -64;

  1487.                 shift = (255 - v->lumshift * 2) << 6;

  1488.                 if(v->lumshift > 31)

  1489.                     shift += 128 << 6;

  1490.             } else {

  1491.                 scale = v->lumscale + 32;

  1492.                 if(v->lumshift > 31)

  1493.                     shift = (v->lumshift - 64) << 6;

  1494.                 else

  1495.                     shift = v->lumshift << 6;

  1496.             }

  1497.             for(i = 0; i < 256; i++) {

  1498.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1499.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1500.             }

  1501.         }

  1502.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1503.             v->s.quarter_sample = 0;

  1504.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1505.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1506.                 v->s.quarter_sample = 0;

  1507.             else

  1508.                 v->s.quarter_sample = 1;

  1509.         } else

  1510.             v->s.quarter_sample = 1;

  1511.         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));

  1512. 

  1513.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1514.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1515.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1516.         {

  1517.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1518.             if (status < 0) return -1;

  1519.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1520.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1521.         } else {

  1522.             v->mv_type_is_raw = 0;

  1523.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1524.         }

  1525.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1526.         if (status < 0) return -1;

  1527.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1528.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1529. 

  1530.         /* Hopefully this is correct for P frames */

  1531.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1532.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1533. 

  1534.         if (v->dquant)

  1535.         {

  1536.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1537.             vop_dquant_decoding(v);

  1538.         }

  1539. 

  1540.         v->ttfrm = 0; //FIXME Is that so ?

  1541.         if (v->vstransform)

  1542.         {

  1543.             v->ttmbf = get_bits(gb, 1);

  1544.             if (v->ttmbf)

  1545.             {

  1546.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1547.             }

  1548.         } else {

  1549.             v->ttmbf = 1;

  1550.             v->ttfrm = TT_8X8;

  1551.         }

  1552.         break;

  1553.     case B_TYPE:

  1554.         if (v->pq < 5) v->tt_index = 0;

  1555.         else if(v->pq < 13) v->tt_index = 1;

  1556.         else v->tt_index = 2;

  1557. 

  1558.         lowquant = (v->pq > 12) ? 0 : 1;

  1559.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1560.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1561.         v->s.mspel = v->s.quarter_sample;

  1562. 

  1563.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1564.         if (status < 0) return -1;

  1565.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1566.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1567.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1568.         if (status < 0) return -1;

  1569.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1570.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1571. 

  1572.         v->s.mv_table_index = get_bits(gb, 2);

  1573.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1574. 

  1575.         if (v->dquant)

  1576.         {

  1577.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1578.             vop_dquant_decoding(v);

  1579.         }

  1580. 

  1581.         v->ttfrm = 0;

  1582.         if (v->vstransform)

  1583.         {

  1584.             v->ttmbf = get_bits(gb, 1);

  1585.             if (v->ttmbf)

  1586.             {

  1587.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1588.             }

  1589.         } else {

  1590.             v->ttmbf = 1;

  1591.             v->ttfrm = TT_8X8;

  1592.         }

  1593.         break;

  1594.     }

  1595. 

  1596.     /* AC Syntax */

  1597.     v->c_ac_table_index = decode012(gb);

  1598.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1599.     {

  1600.         v->y_ac_table_index = decode012(gb);

  1601.     }

  1602.     /* DC Syntax */

  1603.     v->s.dc_table_index = get_bits(gb, 1);

  1604. 

  1605.     if(v->s.pict_type == BI_TYPE) {

  1606.         v->s.pict_type = B_TYPE;

  1607.         v->bi_type = 1;

  1608.     }

  1609.     return 0;

  1610. }

  1611. 

  1612. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1613. {

  1614.     int fcm;

  1615.     int pqindex, lowquant;

  1616.     int status;

  1617. 

  1618.     v->p_frame_skipped = 0;

  1619. 

  1620.     if(v->interlace)

  1621.         fcm = decode012(gb);

  1622.     switch(get_prefix(gb, 0, 4)) {

  1623.     case 0:

  1624.         v->s.pict_type = P_TYPE;

  1625.         break;

  1626.     case 1:

  1627.         v->s.pict_type = B_TYPE;

  1628.         break;

  1629.     case 2:

  1630.         v->s.pict_type = I_TYPE;

  1631.         break;

  1632.     case 3:

  1633.         v->s.pict_type = BI_TYPE;

  1634.         break;

  1635.     case 4:

  1636.         v->s.pict_type = P_TYPE; // skipped pic

  1637.         v->p_frame_skipped = 1;

  1638.         return 0;

  1639.     }

  1640.     if(v->tfcntrflag)

  1641.         get_bits(gb, 8);

  1642.     if(v->broadcast) {

  1643.         if(!v->interlace || v->panscanflag) {

  1644.             get_bits(gb, 2);

  1645.         } else {

  1646.             get_bits1(gb);

  1647.             get_bits1(gb);

  1648.         }

  1649.     }

  1650.     if(v->panscanflag) {

  1651.         //...

  1652.     }

  1653.     v->rnd = get_bits1(gb);

  1654.     if(v->interlace)

  1655.         v->uvsamp = get_bits1(gb);

  1656.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1657.     if(v->s.pict_type == B_TYPE) {

  1658.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1659.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1660.         if(v->bfraction == 0) {

  1661.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1662.         }

  1663.     }

  1664.     pqindex = get_bits(gb, 5);

  1665.     v->pqindex = pqindex;

  1666.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1667.         v->pq = pquant_table[0][pqindex];

  1668.     else

  1669.         v->pq = pquant_table[1][pqindex];

  1670. 

  1671.     v->pquantizer = 1;

  1672.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1673.         v->pquantizer = pqindex < 9;

  1674.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1675.         v->pquantizer = 0;

  1676.     v->pqindex = pqindex;

  1677.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1678.     else v->halfpq = 0;

  1679.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1680.         v->pquantizer = get_bits(gb, 1);

  1681. 

  1682.     switch(v->s.pict_type) {

  1683.     case I_TYPE:

  1684.     case BI_TYPE:

  1685.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1686.         if (status < 0) return -1;

  1687.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1688.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1689.         v->condover = CONDOVER_NONE;

  1690.         if(v->overlap && v->pq <= 8) {

  1691.             v->condover = decode012(gb);

  1692.             if(v->condover == CONDOVER_SELECT) {

  1693.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1694.                 if (status < 0) return -1;

  1695.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1696.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1697.             }

  1698.         }

  1699.         break;

  1700.     case P_TYPE:

  1701.         if(v->postprocflag)

  1702.             v->postproc = get_bits1(gb);

  1703.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1704.         else v->mvrange = 0;

  1705.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1706.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1707.         v->range_x = 1 << (v->k_x - 1);

  1708.         v->range_y = 1 << (v->k_y - 1);

  1709. 

  1710.         if (v->pq < 5) v->tt_index = 0;

  1711.         else if(v->pq < 13) v->tt_index = 1;

  1712.         else v->tt_index = 2;

  1713. 

  1714.         lowquant = (v->pq > 12) ? 0 : 1;

  1715.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1716.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1717.         {

  1718.             int scale, shift, i;

  1719.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1721.             v->lumshift = get_bits(gb, 6);

  1722.             /* fill lookup tables for intensity compensation */

  1723.             if(!v->lumscale) {

  1724.                 scale = -64;

  1725.                 shift = (255 - v->lumshift * 2) << 6;

  1726.                 if(v->lumshift > 31)

  1727.                     shift += 128 << 6;

  1728.             } else {

  1729.                 scale = v->lumscale + 32;

  1730.                 if(v->lumshift > 31)

  1731.                     shift = (v->lumshift - 64) << 6;

  1732.                 else

  1733.                     shift = v->lumshift << 6;

  1734.             }

  1735.             for(i = 0; i < 256; i++) {

  1736.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1737.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1738.             }

  1739.         }

  1740.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1741.             v->s.quarter_sample = 0;

  1742.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1743.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1744.                 v->s.quarter_sample = 0;

  1745.             else

  1746.                 v->s.quarter_sample = 1;

  1747.         } else

  1748.             v->s.quarter_sample = 1;

  1749.         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));

  1750. 

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

  1752.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1753.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1754.         {

  1755.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1756.             if (status < 0) return -1;

  1757.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1758.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1759.         } else {

  1760.             v->mv_type_is_raw = 0;

  1761.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1762.         }

  1763.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1764.         if (status < 0) return -1;

  1765.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1766.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1767. 

  1768.         /* Hopefully this is correct for P frames */

  1769.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1770.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1771.         if (v->dquant)

  1772.         {

  1773.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1774.             vop_dquant_decoding(v);

  1775.         }

  1776. 

  1777.         v->ttfrm = 0; //FIXME Is that so ?

  1778.         if (v->vstransform)

  1779.         {

  1780.             v->ttmbf = get_bits(gb, 1);

  1781.             if (v->ttmbf)

  1782.             {

  1783.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1784.             }

  1785.         } else {

  1786.             v->ttmbf = 1;

  1787.             v->ttfrm = TT_8X8;

  1788.         }

  1789.         break;

  1790.     case B_TYPE:

  1791.         if(v->postprocflag)

  1792.             v->postproc = get_bits1(gb);

  1793.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1794.         else v->mvrange = 0;

  1795.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1796.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1797.         v->range_x = 1 << (v->k_x - 1);

  1798.         v->range_y = 1 << (v->k_y - 1);

  1799. 

  1800.         if (v->pq < 5) v->tt_index = 0;

  1801.         else if(v->pq < 13) v->tt_index = 1;

  1802.         else v->tt_index = 2;

  1803. 

  1804.         lowquant = (v->pq > 12) ? 0 : 1;

  1805.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1806.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1807.         v->s.mspel = v->s.quarter_sample;

  1808. 

  1809.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1810.         if (status < 0) return -1;

  1811.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1812.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1813.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1814.         if (status < 0) return -1;

  1815.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1816.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1817. 

  1818.         v->s.mv_table_index = get_bits(gb, 2);

  1819.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1820. 

  1821.         if (v->dquant)

  1822.         {

  1823.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1824.             vop_dquant_decoding(v);

  1825.         }

  1826. 

  1827.         v->ttfrm = 0;

  1828.         if (v->vstransform)

  1829.         {

  1830.             v->ttmbf = get_bits(gb, 1);

  1831.             if (v->ttmbf)

  1832.             {

  1833.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1834.             }

  1835.         } else {

  1836.             v->ttmbf = 1;

  1837.             v->ttfrm = TT_8X8;

  1838.         }

  1839.         break;

  1840.     }

  1841. 

  1842.     /* AC Syntax */

  1843.     v->c_ac_table_index = decode012(gb);

  1844.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1845.     {

  1846.         v->y_ac_table_index = decode012(gb);

  1847.     }

  1848.     /* DC Syntax */

  1849.     v->s.dc_table_index = get_bits(gb, 1);

  1850.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1851.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1852.         vop_dquant_decoding(v);

  1853.     }

  1854. 

  1855.     v->bi_type = 0;

  1856.     if(v->s.pict_type == BI_TYPE) {

  1857.         v->s.pict_type = B_TYPE;

  1858.         v->bi_type = 1;

  1859.     }

  1860.     return 0;

  1861. }

  1862. 

  1863. /***********************************************************************/

  1864. /**

  1865.  * @defgroup block VC-1 Block-level functions

  1866.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1867.  * @{

  1868.  */

  1869. 

  1870. /**

  1871.  * @def GET_MQUANT

  1872.  * @brief Get macroblock-level quantizer scale

  1873.  */

  1874. #define GET_MQUANT()                                           \

  1875.   if (v->dquantfrm)                                            \

  1876.   {                                                            \

  1877.     int edges = 0;                                             \

  1878.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1879.     {                                                          \

  1880.       if (v->dqbilevel)                                        \

  1881.       {                                                        \

  1882.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1883.       }                                                        \

  1884.       else                                                     \

  1885.       {                                                        \

  1886.         mqdiff = get_bits(gb, 3);                              \

  1887.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1888.         else mquant = get_bits(gb, 5);                         \

  1889.       }                                                        \

  1890.     }                                                          \

  1891.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1892.         edges = 1 << v->dqsbedge;                              \

  1893.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1894.         edges = (3 << v->dqsbedge) % 15;                       \

  1895.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1896.         edges = 15;                                            \

  1897.     if((edges&1) && !s->mb_x)                                  \

  1898.         mquant = v->altpq;                                     \

  1899.     if((edges&2) && s->first_slice_line)                       \

  1900.         mquant = v->altpq;                                     \

  1901.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1902.         mquant = v->altpq;                                     \

  1903.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1904.         mquant = v->altpq;                                     \

  1905.   }

  1906. 

  1907. /**

  1908.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1909.  * @brief Get MV differentials

  1910.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1911.  * @param _dmv_x Horizontal differential for decoded MV

  1912.  * @param _dmv_y Vertical differential for decoded MV

  1913.  */

  1914. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1915.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1916.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1917.   if (index > 36)                                                   \

  1918.   {                                                                 \

  1919.     mb_has_coeffs = 1;                                              \

  1920.     index -= 37;                                                    \

  1921.   }                                                                 \

  1922.   else mb_has_coeffs = 0;                                           \

  1923.   s->mb_intra = 0;                                                  \

  1924.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1925.   else if (index == 35)                                             \

  1926.   {                                                                 \

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

  1928.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1929.   }                                                                 \

  1930.   else if (index == 36)                                             \

  1931.   {                                                                 \

  1932.     _dmv_x = 0;                                                     \

  1933.     _dmv_y = 0;                                                     \

  1934.     s->mb_intra = 1;                                                \

  1935.   }                                                                 \

  1936.   else                                                              \

  1937.   {                                                                 \

  1938.     index1 = index%6;                                               \

  1939.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1940.     else                                   val = 0;                 \

  1941.     if(size_table[index1] - val > 0)                                \

  1942.         val = get_bits(gb, size_table[index1] - val);               \

  1943.     else                                   val = 0;                 \

  1944.     sign = 0 - (val&1);                                             \

  1945.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1946.                                                                     \

  1947.     index1 = index/6;                                               \

  1948.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1949.     else                                   val = 0;                 \

  1950.     if(size_table[index1] - val > 0)                                \

  1951.         val = get_bits(gb, size_table[index1] - val);               \

  1952.     else                                   val = 0;                 \

  1953.     sign = 0 - (val&1);                                             \

  1954.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1955.   }

  1956. 

  1957. /** Predict and set motion vector

  1958.  */

  1959. 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)

  1960. {

  1961.     int xy, wrap, off = 0;

  1962.     int16_t *A, *B, *C;

  1963.     int px, py;

  1964.     int sum;

  1965. 

  1966.     /* scale MV difference to be quad-pel */

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

  1968.     dmv_y <<= 1 - s->quarter_sample;

  1969. 

  1970.     wrap = s->b8_stride;

  1971.     xy = s->block_index[n];

  1972. 

  1973.     if(s->mb_intra){

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

  1975.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1976.         if(mv1) { /* duplicate motion data for 1-MV block */

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

  1978.             s->current_picture.motion_val[0][xy + 1][1] = 0;

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

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

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

  1982.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1983.         }

  1984.         return;

  1985.     }

  1986. 

  1987.     C = s->current_picture.motion_val[0][xy - 1];

  1988.     A = s->current_picture.motion_val[0][xy - wrap];

  1989.     if(mv1)

  1990.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1991.     else {

  1992.         //in 4-MV mode different blocks have different B predictor position

  1993.         switch(n){

  1994.         case 0:

  1995.             off = (s->mb_x > 0) ? -1 : 1;

  1996.             break;

  1997.         case 1:

  1998.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1999.             break;

  2000.         case 2:

  2001.             off = 1;

  2002.             break;

  2003.         case 3:

  2004.             off = -1;

  2005.         }

  2006.     }

  2007.     B = s->current_picture.motion_val[0][xy - wrap + off];

  2008. 

  2009.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  2010.         if(s->mb_width == 1) {

  2011.             px = A[0];

  2012.             py = A[1];

  2013.         } else {

  2014.             px = mid_pred(A[0], B[0], C[0]);

  2015.             py = mid_pred(A[1], B[1], C[1]);

  2016.         }

  2017.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  2018.         px = C[0];

  2019.         py = C[1];

  2020.     } else {

  2021.         px = py = 0;

  2022.     }

  2023.     /* Pullback MV as specified in 8.3.5.3.4 */

  2024.     {

  2025.         int qx, qy, X, Y;

  2026.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  2027.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  2028.         X = (s->mb_width << 6) - 4;

  2029.         Y = (s->mb_height << 6) - 4;

  2030.         if(mv1) {

  2031.             if(qx + px < -60) px = -60 - qx;

  2032.             if(qy + py < -60) py = -60 - qy;

  2033.         } else {

  2034.             if(qx + px < -28) px = -28 - qx;

  2035.             if(qy + py < -28) py = -28 - qy;

  2036.         }

  2037.         if(qx + px > X) px = X - qx;

  2038.         if(qy + py > Y) py = Y - qy;

  2039.     }

  2040.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2041.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  2042.         if(is_intra[xy - wrap])

  2043.             sum = FFABS(px) + FFABS(py);

  2044.         else

  2045.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2046.         if(sum > 32) {

  2047.             if(get_bits1(&s->gb)) {

  2048.                 px = A[0];

  2049.                 py = A[1];

  2050.             } else {

  2051.                 px = C[0];

  2052.                 py = C[1];

  2053.             }

  2054.         } else {

  2055.             if(is_intra[xy - 1])

  2056.                 sum = FFABS(px) + FFABS(py);

  2057.             else

  2058.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2059.             if(sum > 32) {

  2060.                 if(get_bits1(&s->gb)) {

  2061.                     px = A[0];

  2062.                     py = A[1];

  2063.                 } else {

  2064.                     px = C[0];

  2065.                     py = C[1];

  2066.                 }

  2067.             }

  2068.         }

  2069.     }

  2070.     /* store MV using signed modulus of MV range defined in 4.11 */

  2071.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  2072.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  2073.     if(mv1) { /* duplicate motion data for 1-MV block */

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

  2075.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

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

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

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

  2079.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  2080.     }

  2081. }

  2082. 

  2083. /** Motion compensation for direct or interpolated blocks in B-frames

  2084.  */

  2085. static void vc1_interp_mc(VC1Context *v)

  2086. {

  2087.     MpegEncContext *s = &v->s;

  2088.     DSPContext *dsp = &v->s.dsp;

  2089.     uint8_t *srcY, *srcU, *srcV;

  2090.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  2091. 

  2092.     if(!v->s.next_picture.data[0])return;

  2093. 

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

  2095.     my = s->mv[1][0][1];

  2096.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  2097.     uvmy = (my + ((my & 3) == 3)) >> 1;

  2098.     if(v->fastuvmc) {

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

  2100.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  2101.     }

  2102.     srcY = s->next_picture.data[0];

  2103.     srcU = s->next_picture.data[1];

  2104.     srcV = s->next_picture.data[2];

  2105. 

  2106.     src_x = s->mb_x * 16 + (mx >> 2);

  2107.     src_y = s->mb_y * 16 + (my >> 2);

  2108.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  2109.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  2110. 

  2111.     src_x   = clip(  src_x, -16, s->mb_width  * 16);

  2112.     src_y   = clip(  src_y, -16, s->mb_height * 16);

  2113.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  2114.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  2115. 

  2116.     srcY += src_y * s->linesize + src_x;

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

  2118.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  2119. 

  2120.     /* for grayscale we should not try to read from unknown area */

  2121.     if(s->flags & CODEC_FLAG_GRAY) {

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

  2123.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  2124.     }

  2125. 

  2126.     if(v->rangeredfrm

  2127.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  2128.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  2129.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  2130. 

  2131.         srcY -= s->mspel * (1 + s->linesize);

  2132.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  2133.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  2134.         srcY = s->edge_emu_buffer;

  2135.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  2136.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2137.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  2138.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  2139.         srcU = uvbuf;

  2140.         srcV = uvbuf + 16;

  2141.         /* if we deal with range reduction we need to scale source blocks */

  2142.         if(v->rangeredfrm) {

  2143.             int i, j;

  2144.             uint8_t *src, *src2;

  2145. 

  2146.             src = srcY;

  2147.             for(j = 0; j < 17 + s->mspel*2; j++) {

  2148.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  2149.                 src += s->linesize;

  2150.             }

  2151.             src = srcU; src2 = srcV;

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

  2153.                 for(i = 0; i < 9; i++) {

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

  2155.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  2156.                 }

  2157.                 src += s->uvlinesize;

  2158.                 src2 += s->uvlinesize;

  2159.             }

  2160.         }

  2161.         srcY += s->mspel * (1 + s->linesize);

  2162.     }

  2163. 

  2164.     mx >>= 1;

  2165.     my >>= 1;

  2166.     dxy = ((my & 1) << 1) | (mx & 1);

  2167. 

  2168.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  2169. 

  2170.     if(s->flags & CODEC_FLAG_GRAY) return;

  2171.     /* Chroma MC always uses qpel blilinear */

  2172.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

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

  2174.     uvmy = (uvmy&3)<<1;

  2175.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  2176.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  2177. }

  2178. 

  2179. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  2180. {

  2181.     int n = bfrac;

  2182. 

  2183. #if B_FRACTION_DEN==256

  2184.     if(inv)

  2185.         n -= 256;

  2186.     if(!qs)

  2187.         return 2 * ((value * n + 255) >> 9);

  2188.     return (value * n + 128) >> 8;

  2189. #else

  2190.     if(inv)

  2191.         n -= B_FRACTION_DEN;

  2192.     if(!qs)

  2193.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2194.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2195. #endif

  2196. }

  2197. 

  2198. /** Reconstruct motion vector for B-frame and do motion compensation

  2199.  */

  2200. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  2201. {

  2202.     if(v->use_ic) {

  2203.         v->mv_mode2 = v->mv_mode;

  2204.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  2205.     }

  2206.     if(direct) {

  2207.         vc1_mc_1mv(v, 0);

  2208.         vc1_interp_mc(v);

  2209.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2210.         return;

  2211.     }

  2212.     if(mode == BMV_TYPE_INTERPOLATED) {

  2213.         vc1_mc_1mv(v, 0);

  2214.         vc1_interp_mc(v);

  2215.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  2216.         return;

  2217.     }

  2218. 

  2219.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  2220.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2221.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  2222. }

  2223. 

  2224. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  2225. {

  2226.     MpegEncContext *s = &v->s;

  2227.     int xy, wrap, off = 0;

  2228.     int16_t *A, *B, *C;

  2229.     int px, py;

  2230.     int sum;

  2231.     int r_x, r_y;

  2232.     const uint8_t *is_intra = v->mb_type[0];

  2233. 

  2234.     r_x = v->range_x;

  2235.     r_y = v->range_y;

  2236.     /* scale MV difference to be quad-pel */

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

  2238.     dmv_y[0] <<= 1 - s->quarter_sample;

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

  2240.     dmv_y[1] <<= 1 - s->quarter_sample;

  2241. 

  2242.     wrap = s->b8_stride;

  2243.     xy = s->block_index[0];

  2244. 

  2245.     if(s->mb_intra) {

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

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

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

  2249.         s->current_picture.motion_val[1][xy][1] = 0;

  2250.         return;

  2251.     }

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

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

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

  2255.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2256.     if(direct) {

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

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

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

  2260.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2261.         return;

  2262.     }

  2263. 

  2264.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2265.         C = s->current_picture.motion_val[0][xy - 2];

  2266.         A = s->current_picture.motion_val[0][xy - wrap*2];

  2267.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2268.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  2269. 

  2270.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2271.             if(s->mb_width == 1) {

  2272.                 px = A[0];

  2273.                 py = A[1];

  2274.             } else {

  2275.                 px = mid_pred(A[0], B[0], C[0]);

  2276.                 py = mid_pred(A[1], B[1], C[1]);

  2277.             }

  2278.         } else if(s->mb_x) { // predictor C is not out of bounds

  2279.             px = C[0];

  2280.             py = C[1];

  2281.         } else {

  2282.             px = py = 0;

  2283.         }

  2284.         /* Pullback MV as specified in 8.3.5.3.4 */

  2285.         {

  2286.             int qx, qy, X, Y;

  2287.             if(v->profile < PROFILE_ADVANCED) {

  2288.                 qx = (s->mb_x << 5);

  2289.                 qy = (s->mb_y << 5);

  2290.                 X = (s->mb_width << 5) - 4;

  2291.                 Y = (s->mb_height << 5) - 4;

  2292.                 if(qx + px < -28) px = -28 - qx;

  2293.                 if(qy + py < -28) py = -28 - qy;

  2294.                 if(qx + px > X) px = X - qx;

  2295.                 if(qy + py > Y) py = Y - qy;

  2296.             } else {

  2297.                 qx = (s->mb_x << 6);

  2298.                 qy = (s->mb_y << 6);

  2299.                 X = (s->mb_width << 6) - 4;

  2300.                 Y = (s->mb_height << 6) - 4;

  2301.                 if(qx + px < -60) px = -60 - qx;

  2302.                 if(qy + py < -60) py = -60 - qy;

  2303.                 if(qx + px > X) px = X - qx;

  2304.                 if(qy + py > Y) py = Y - qy;

  2305.             }

  2306.         }

  2307.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2308.         if(0 && !s->first_slice_line && s->mb_x) {

  2309.             if(is_intra[xy - wrap])

  2310.                 sum = FFABS(px) + FFABS(py);

  2311.             else

  2312.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2313.             if(sum > 32) {

  2314.                 if(get_bits1(&s->gb)) {

  2315.                     px = A[0];

  2316.                     py = A[1];

  2317.                 } else {

  2318.                     px = C[0];

  2319.                     py = C[1];

  2320.                 }

  2321.             } else {

  2322.                 if(is_intra[xy - 2])

  2323.                     sum = FFABS(px) + FFABS(py);

  2324.                 else

  2325.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2326.                 if(sum > 32) {

  2327.                     if(get_bits1(&s->gb)) {

  2328.                         px = A[0];

  2329.                         py = A[1];

  2330.                     } else {

  2331.                         px = C[0];

  2332.                         py = C[1];

  2333.                     }

  2334.                 }

  2335.             }

  2336.         }

  2337.         /* store MV using signed modulus of MV range defined in 4.11 */

  2338.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2339.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2340.     }

  2341.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2342.         C = s->current_picture.motion_val[1][xy - 2];

  2343.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2344.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2345.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2346. 

  2347.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2348.             if(s->mb_width == 1) {

  2349.                 px = A[0];

  2350.                 py = A[1];

  2351.             } else {

  2352.                 px = mid_pred(A[0], B[0], C[0]);

  2353.                 py = mid_pred(A[1], B[1], C[1]);

  2354.             }

  2355.         } else if(s->mb_x) { // predictor C is not out of bounds

  2356.             px = C[0];

  2357.             py = C[1];

  2358.         } else {

  2359.             px = py = 0;

  2360.         }

  2361.         /* Pullback MV as specified in 8.3.5.3.4 */

  2362.         {

  2363.             int qx, qy, X, Y;

  2364.             if(v->profile < PROFILE_ADVANCED) {

  2365.                 qx = (s->mb_x << 5);

  2366.                 qy = (s->mb_y << 5);

  2367.                 X = (s->mb_width << 5) - 4;

  2368.                 Y = (s->mb_height << 5) - 4;

  2369.                 if(qx + px < -28) px = -28 - qx;

  2370.                 if(qy + py < -28) py = -28 - qy;

  2371.                 if(qx + px > X) px = X - qx;

  2372.                 if(qy + py > Y) py = Y - qy;

  2373.             } else {

  2374.                 qx = (s->mb_x << 6);

  2375.                 qy = (s->mb_y << 6);

  2376.                 X = (s->mb_width << 6) - 4;

  2377.                 Y = (s->mb_height << 6) - 4;

  2378.                 if(qx + px < -60) px = -60 - qx;

  2379.                 if(qy + py < -60) py = -60 - qy;

  2380.                 if(qx + px > X) px = X - qx;

  2381.                 if(qy + py > Y) py = Y - qy;

  2382.             }

  2383.         }

  2384.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2385.         if(0 && !s->first_slice_line && s->mb_x) {

  2386.             if(is_intra[xy - wrap])

  2387.                 sum = FFABS(px) + FFABS(py);

  2388.             else

  2389.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2390.             if(sum > 32) {

  2391.                 if(get_bits1(&s->gb)) {

  2392.                     px = A[0];

  2393.                     py = A[1];

  2394.                 } else {

  2395.                     px = C[0];

  2396.                     py = C[1];

  2397.                 }

  2398.             } else {

  2399.                 if(is_intra[xy - 2])

  2400.                     sum = FFABS(px) + FFABS(py);

  2401.                 else

  2402.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2403.                 if(sum > 32) {

  2404.                     if(get_bits1(&s->gb)) {

  2405.                         px = A[0];

  2406.                         py = A[1];

  2407.                     } else {

  2408.                         px = C[0];

  2409.                         py = C[1];

  2410.                     }

  2411.                 }

  2412.             }

  2413.         }

  2414.         /* store MV using signed modulus of MV range defined in 4.11 */

  2415. 

  2416.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2417.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2418.     }

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

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

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

  2422.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2423. }

  2424. 

  2425. /** Get predicted DC value for I-frames only

  2426.  * prediction dir: left=0, top=1

  2427.  * @param s MpegEncContext

  2428.  * @param[in] n block index in the current MB

  2429.  * @param dc_val_ptr Pointer to DC predictor

  2430.  * @param dir_ptr Prediction direction for use in AC prediction

  2431.  */

  2432. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2433.                               int16_t **dc_val_ptr, int *dir_ptr)

  2434. {

  2435.     int a, b, c, wrap, pred, scale;

  2436.     int16_t *dc_val;

  2437.     static const uint16_t dcpred[32] = {

  2438.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2439.          114,  102,   93,   85,   79,   73,   68,   64,

  2440.           60,   57,   54,   51,   49,   47,   45,   43,

  2441.           41,   39,   38,   37,   35,   34,   33

  2442.     };

  2443. 

  2444.     /* find prediction - wmv3_dc_scale always used here in fact */

  2445.     if (n < 4)     scale = s->y_dc_scale;

  2446.     else           scale = s->c_dc_scale;

  2447. 

  2448.     wrap = s->block_wrap[n];

  2449.     dc_val= s->dc_val[0] + s->block_index[n];

  2450. 

  2451.     /* B A

  2452.      * C X

  2453.      */

  2454.     c = dc_val[ - 1];

  2455.     b = dc_val[ - 1 - wrap];

  2456.     a = dc_val[ - wrap];

  2457. 

  2458.     if (pq < 9 || !overlap)

  2459.     {

  2460.         /* Set outer values */

  2461.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2462.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2463.     }

  2464.     else

  2465.     {

  2466.         /* Set outer values */

  2467.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2468.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2469.     }

  2470. 

  2471.     if (abs(a - b) <= abs(b - c)) {

  2472.         pred = c;

  2473.         *dir_ptr = 1;//left

  2474.     } else {

  2475.         pred = a;

  2476.         *dir_ptr = 0;//top

  2477.     }

  2478. 

  2479.     /* update predictor */

  2480.     *dc_val_ptr = &dc_val[0];

  2481.     return pred;

  2482. }

  2483. 

  2484. 

  2485. /** Get predicted DC value

  2486.  * prediction dir: left=0, top=1

  2487.  * @param s MpegEncContext

  2488.  * @param[in] n block index in the current MB

  2489.  * @param dc_val_ptr Pointer to DC predictor

  2490.  * @param dir_ptr Prediction direction for use in AC prediction

  2491.  */

  2492. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2493.                               int a_avail, int c_avail,

  2494.                               int16_t **dc_val_ptr, int *dir_ptr)

  2495. {

  2496.     int a, b, c, wrap, pred, scale;

  2497.     int16_t *dc_val;

  2498.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2499.     int q1, q2 = 0;

  2500. 

  2501.     /* find prediction - wmv3_dc_scale always used here in fact */

  2502.     if (n < 4)     scale = s->y_dc_scale;

  2503.     else           scale = s->c_dc_scale;

  2504. 

  2505.     wrap = s->block_wrap[n];

  2506.     dc_val= s->dc_val[0] + s->block_index[n];

  2507. 

  2508.     /* B A

  2509.      * C X

  2510.      */

  2511.     c = dc_val[ - 1];

  2512.     b = dc_val[ - 1 - wrap];

  2513.     a = dc_val[ - wrap];

  2514.     /* scale predictors if needed */

  2515.     q1 = s->current_picture.qscale_table[mb_pos];

  2516.     if(c_avail && (n!= 1 && n!=3)) {

  2517.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2518.         if(q2 && q2 != q1)

  2519.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2520.     }

  2521.     if(a_avail && (n!= 2 && n!=3)) {

  2522.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2523.         if(q2 && q2 != q1)

  2524.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2525.     }

  2526.     if(a_avail && c_avail && (n!=3)) {

  2527.         int off = mb_pos;

  2528.         if(n != 1) off--;

  2529.         if(n != 2) off -= s->mb_stride;

  2530.         q2 = s->current_picture.qscale_table[off];

  2531.         if(q2 && q2 != q1)

  2532.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2533.     }

  2534. 

  2535.     if(a_avail && c_avail) {

  2536.         if(abs(a - b) <= abs(b - c)) {

  2537.             pred = c;

  2538.             *dir_ptr = 1;//left

  2539.         } else {

  2540.             pred = a;

  2541.             *dir_ptr = 0;//top

  2542.         }

  2543.     } else if(a_avail) {

  2544.         pred = a;

  2545.         *dir_ptr = 0;//top

  2546.     } else if(c_avail) {

  2547.         pred = c;

  2548.         *dir_ptr = 1;//left

  2549.     } else {

  2550.         pred = 0;

  2551.         *dir_ptr = 1;//left

  2552.     }

  2553. 

  2554.     /* update predictor */

  2555.     *dc_val_ptr = &dc_val[0];

  2556.     return pred;

  2557. }

  2558. 

  2559. 

  2560. /**

  2561.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2562.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2563.  * @{

  2564.  */

  2565. 

  2566. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2567. {

  2568.     int xy, wrap, pred, a, b, c;

  2569. 

  2570.     xy = s->block_index[n];

  2571.     wrap = s->b8_stride;

  2572. 

  2573.     /* B C

  2574.      * A X

  2575.      */

  2576.     a = s->coded_block[xy - 1       ];

  2577.     b = s->coded_block[xy - 1 - wrap];

  2578.     c = s->coded_block[xy     - wrap];

  2579. 

  2580.     if (b == c) {

  2581.         pred = a;

  2582.     } else {

  2583.         pred = c;

  2584.     }

  2585. 

  2586.     /* store value */

  2587.     *coded_block_ptr = &s->coded_block[xy];

  2588. 

  2589.     return pred;

  2590. }

  2591. 

  2592. /**

  2593.  * Decode one AC coefficient

  2594.  * @param v The VC1 context

  2595.  * @param last Last coefficient

  2596.  * @param skip How much zero coefficients to skip

  2597.  * @param value Decoded AC coefficient value

  2598.  * @see 8.1.3.4

  2599.  */

  2600. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2601. {

  2602.     GetBitContext *gb = &v->s.gb;

  2603.     int index, escape, run = 0, level = 0, lst = 0;

  2604. 

  2605.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2606.     if (index != vc1_ac_sizes[codingset] - 1) {

  2607.         run = vc1_index_decode_table[codingset][index][0];

  2608.         level = vc1_index_decode_table[codingset][index][1];

  2609.         lst = index >= vc1_last_decode_table[codingset];

  2610.         if(get_bits(gb, 1))

  2611.             level = -level;

  2612.     } else {

  2613.         escape = decode210(gb);

  2614.         if (escape != 2) {

  2615.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2616.             run = vc1_index_decode_table[codingset][index][0];

  2617.             level = vc1_index_decode_table[codingset][index][1];

  2618.             lst = index >= vc1_last_decode_table[codingset];

  2619.             if(escape == 0) {

  2620.                 if(lst)

  2621.                     level += vc1_last_delta_level_table[codingset][run];

  2622.                 else

  2623.                     level += vc1_delta_level_table[codingset][run];

  2624.             } else {

  2625.                 if(lst)

  2626.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2627.                 else

  2628.                     run += vc1_delta_run_table[codingset][level] + 1;

  2629.             }

  2630.             if(get_bits(gb, 1))

  2631.                 level = -level;

  2632.         } else {

  2633.             int sign;

  2634.             lst = get_bits(gb, 1);

  2635.             if(v->s.esc3_level_length == 0) {

  2636.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2637.                     v->s.esc3_level_length = get_bits(gb, 3);

  2638.                     if(!v->s.esc3_level_length)

  2639.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2640.                 } else { //table 60

  2641.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2642.                 }

  2643.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2644.             }

  2645.             run = get_bits(gb, v->s.esc3_run_length);

  2646.             sign = get_bits(gb, 1);

  2647.             level = get_bits(gb, v->s.esc3_level_length);

  2648.             if(sign)

  2649.                 level = -level;

  2650.         }

  2651.     }

  2652. 

  2653.     *last = lst;

  2654.     *skip = run;

  2655.     *value = level;

  2656. }

  2657. 

  2658. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2659.  * @param v VC1Context

  2660.  * @param block block to decode

  2661.  * @param coded are AC coeffs present or not

  2662.  * @param codingset set of VLC to decode data

  2663.  */

  2664. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2665. {

  2666.     GetBitContext *gb = &v->s.gb;

  2667.     MpegEncContext *s = &v->s;

  2668.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2669.     int run_diff, i;

  2670.     int16_t *dc_val;

  2671.     int16_t *ac_val, *ac_val2;

  2672.     int dcdiff;

  2673. 

  2674.     /* Get DC differential */

  2675.     if (n < 4) {

  2676.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2677.     } else {

  2678.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2679.     }

  2680.     if (dcdiff < 0){

  2681.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2682.         return -1;

  2683.     }

  2684.     if (dcdiff)

  2685.     {

  2686.         if (dcdiff == 119 /* ESC index value */)

  2687.         {

  2688.             /* TODO: Optimize */

  2689.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2690.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2691.             else dcdiff = get_bits(gb, 8);

  2692.         }

  2693.         else

  2694.         {

  2695.             if (v->pq == 1)

  2696.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2697.             else if (v->pq == 2)

  2698.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2699.         }

  2700.         if (get_bits(gb, 1))

  2701.             dcdiff = -dcdiff;

  2702.     }

  2703. 

  2704.     /* Prediction */

  2705.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2706.     *dc_val = dcdiff;

  2707. 

  2708.     /* Store the quantized DC coeff, used for prediction */

  2709.     if (n < 4) {

  2710.         block[0] = dcdiff * s->y_dc_scale;

  2711.     } else {

  2712.         block[0] = dcdiff * s->c_dc_scale;

  2713.     }

  2714.     /* Skip ? */

  2715.     run_diff = 0;

  2716.     i = 0;

  2717.     if (!coded) {

  2718.         goto not_coded;

  2719.     }

  2720. 

  2721.     //AC Decoding

  2722.     i = 1;

  2723. 

  2724.     {

  2725.         int last = 0, skip, value;

  2726.         const int8_t *zz_table;

  2727.         int scale;

  2728.         int k;

  2729. 

  2730.         scale = v->pq * 2 + v->halfpq;

  2731. 

  2732.         if(v->s.ac_pred) {

  2733.             if(!dc_pred_dir)

  2734.                 zz_table = vc1_horizontal_zz;

  2735.             else

  2736.                 zz_table = vc1_vertical_zz;

  2737.         } else

  2738.             zz_table = vc1_normal_zz;

  2739. 

  2740.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2741.         ac_val2 = ac_val;

  2742.         if(dc_pred_dir) //left

  2743.             ac_val -= 16;

  2744.         else //top

  2745.             ac_val -= 16 * s->block_wrap[n];

  2746. 

  2747.         while (!last) {

  2748.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2749.             i += skip;

  2750.             if(i > 63)

  2751.                 break;

  2752.             block[zz_table[i++]] = value;

  2753.         }

  2754. 

  2755.         /* apply AC prediction if needed */

  2756.         if(s->ac_pred) {

  2757.             if(dc_pred_dir) { //left

  2758.                 for(k = 1; k < 8; k++)

  2759.                     block[k << 3] += ac_val[k];

  2760.             } else { //top

  2761.                 for(k = 1; k < 8; k++)

  2762.                     block[k] += ac_val[k + 8];

  2763.             }

  2764.         }

  2765.         /* save AC coeffs for further prediction */

  2766.         for(k = 1; k < 8; k++) {

  2767.             ac_val2[k] = block[k << 3];

  2768.             ac_val2[k + 8] = block[k];

  2769.         }

  2770. 

  2771.         /* scale AC coeffs */

  2772.         for(k = 1; k < 64; k++)

  2773.             if(block[k]) {

  2774.                 block[k] *= scale;

  2775.                 if(!v->pquantizer)

  2776.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2777.             }

  2778. 

  2779.         if(s->ac_pred) i = 63;

  2780.     }

  2781. 

  2782. not_coded:

  2783.     if(!coded) {

  2784.         int k, scale;

  2785.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2786.         ac_val2 = ac_val;

  2787. 

  2788.         scale = v->pq * 2 + v->halfpq;

  2789.         memset(ac_val2, 0, 16 * 2);

  2790.         if(dc_pred_dir) {//left

  2791.             ac_val -= 16;

  2792.             if(s->ac_pred)

  2793.                 memcpy(ac_val2, ac_val, 8 * 2);

  2794.         } else {//top

  2795.             ac_val -= 16 * s->block_wrap[n];

  2796.             if(s->ac_pred)

  2797.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2798.         }

  2799. 

  2800.         /* apply AC prediction if needed */

  2801.         if(s->ac_pred) {

  2802.             if(dc_pred_dir) { //left

  2803.                 for(k = 1; k < 8; k++) {

  2804.                     block[k << 3] = ac_val[k] * scale;

  2805.                     if(!v->pquantizer && block[k << 3])

  2806.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2807.                 }

  2808.             } else { //top

  2809.                 for(k = 1; k < 8; k++) {

  2810.                     block[k] = ac_val[k + 8] * scale;

  2811.                     if(!v->pquantizer && block[k])

  2812.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2813.                 }

  2814.             }

  2815.             i = 63;

  2816.         }

  2817.     }

  2818.     s->block_last_index[n] = i;

  2819. 

  2820.     return 0;

  2821. }

  2822. 

  2823. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2824.  * @param v VC1Context

  2825.  * @param block block to decode

  2826.  * @param coded are AC coeffs present or not

  2827.  * @param codingset set of VLC to decode data

  2828.  */

  2829. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2830. {

  2831.     GetBitContext *gb = &v->s.gb;

  2832.     MpegEncContext *s = &v->s;

  2833.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2834.     int run_diff, i;

  2835.     int16_t *dc_val;

  2836.     int16_t *ac_val, *ac_val2;

  2837.     int dcdiff;

  2838.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2839.     int use_pred = s->ac_pred;

  2840.     int scale;

  2841.     int q1, q2 = 0;

  2842.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2843. 

  2844.     /* Get DC differential */

  2845.     if (n < 4) {

  2846.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2847.     } else {

  2848.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2849.     }

  2850.     if (dcdiff < 0){

  2851.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2852.         return -1;

  2853.     }

  2854.     if (dcdiff)

  2855.     {

  2856.         if (dcdiff == 119 /* ESC index value */)

  2857.         {

  2858.             /* TODO: Optimize */

  2859.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2860.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2861.             else dcdiff = get_bits(gb, 8);

  2862.         }

  2863.         else

  2864.         {

  2865.             if (mquant == 1)

  2866.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2867.             else if (mquant == 2)

  2868.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2869.         }

  2870.         if (get_bits(gb, 1))

  2871.             dcdiff = -dcdiff;

  2872.     }

  2873. 

  2874.     /* Prediction */

  2875.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2876.     *dc_val = dcdiff;

  2877. 

  2878.     /* Store the quantized DC coeff, used for prediction */

  2879.     if (n < 4) {

  2880.         block[0] = dcdiff * s->y_dc_scale;

  2881.     } else {

  2882.         block[0] = dcdiff * s->c_dc_scale;

  2883.     }

  2884.     /* Skip ? */

  2885.     run_diff = 0;

  2886.     i = 0;

  2887. 

  2888.     //AC Decoding

  2889.     i = 1;

  2890. 

  2891.     /* check if AC is needed at all and adjust direction if needed */

  2892.     if(!a_avail) dc_pred_dir = 1;

  2893.     if(!c_avail) dc_pred_dir = 0;

  2894.     if(!a_avail && !c_avail) use_pred = 0;

  2895.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2896.     ac_val2 = ac_val;

  2897. 

  2898.     scale = mquant * 2 + v->halfpq;

  2899. 

  2900.     if(dc_pred_dir) //left

  2901.         ac_val -= 16;

  2902.     else //top

  2903.         ac_val -= 16 * s->block_wrap[n];

  2904. 

  2905.     q1 = s->current_picture.qscale_table[mb_pos];

  2906.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2907.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2908.     if(n && n<4) q2 = q1;

  2909. 

  2910.     if(coded) {

  2911.         int last = 0, skip, value;

  2912.         const int8_t *zz_table;

  2913.         int k;

  2914. 

  2915.         if(v->s.ac_pred) {

  2916.             if(!dc_pred_dir)

  2917.                 zz_table = vc1_horizontal_zz;

  2918.             else

  2919.                 zz_table = vc1_vertical_zz;

  2920.         } else

  2921.             zz_table = vc1_normal_zz;

  2922. 

  2923.         while (!last) {

  2924.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2925.             i += skip;

  2926.             if(i > 63)

  2927.                 break;

  2928.             block[zz_table[i++]] = value;

  2929.         }

  2930. 

  2931.         /* apply AC prediction if needed */

  2932.         if(use_pred) {

  2933.             /* scale predictors if needed*/

  2934.             if(q2 && q1!=q2) {

  2935.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2936.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2937. 

  2938.                 if(dc_pred_dir) { //left

  2939.                     for(k = 1; k < 8; k++)

  2940.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2941.                 } else { //top

  2942.                     for(k = 1; k < 8; k++)

  2943.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2944.                 }

  2945.             } else {

  2946.                 if(dc_pred_dir) { //left

  2947.                     for(k = 1; k < 8; k++)

  2948.                         block[k << 3] += ac_val[k];

  2949.                 } else { //top

  2950.                     for(k = 1; k < 8; k++)

  2951.                         block[k] += ac_val[k + 8];

  2952.                 }

  2953.             }

  2954.         }

  2955.         /* save AC coeffs for further prediction */

  2956.         for(k = 1; k < 8; k++) {

  2957.             ac_val2[k] = block[k << 3];

  2958.             ac_val2[k + 8] = block[k];

  2959.         }

  2960. 

  2961.         /* scale AC coeffs */

  2962.         for(k = 1; k < 64; k++)

  2963.             if(block[k]) {

  2964.                 block[k] *= scale;

  2965.                 if(!v->pquantizer)

  2966.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2967.             }

  2968. 

  2969.         if(use_pred) i = 63;

  2970.     } else { // no AC coeffs

  2971.         int k;

  2972. 

  2973.         memset(ac_val2, 0, 16 * 2);

  2974.         if(dc_pred_dir) {//left

  2975.             if(use_pred) {

  2976.                 memcpy(ac_val2, ac_val, 8 * 2);

  2977.                 if(q2 && q1!=q2) {

  2978.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2979.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2980.                     for(k = 1; k < 8; k++)

  2981.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2982.                 }

  2983.             }

  2984.         } else {//top

  2985.             if(use_pred) {

  2986.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2987.                 if(q2 && q1!=q2) {

  2988.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2989.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2990.                     for(k = 1; k < 8; k++)

  2991.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2992.                 }

  2993.             }

  2994.         }

  2995. 

  2996.         /* apply AC prediction if needed */

  2997.         if(use_pred) {

  2998.             if(dc_pred_dir) { //left

  2999.                 for(k = 1; k < 8; k++) {

  3000.                     block[k << 3] = ac_val2[k] * scale;

  3001.                     if(!v->pquantizer && block[k << 3])

  3002.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3003.                 }

  3004.             } else { //top

  3005.                 for(k = 1; k < 8; k++) {

  3006.                     block[k] = ac_val2[k + 8] * scale;

  3007.                     if(!v->pquantizer && block[k])

  3008.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3009.                 }

  3010.             }

  3011.             i = 63;

  3012.         }

  3013.     }

  3014.     s->block_last_index[n] = i;

  3015. 

  3016.     return 0;

  3017. }

  3018. 

  3019. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  3020.  * @param v VC1Context

  3021.  * @param block block to decode

  3022.  * @param coded are AC coeffs present or not

  3023.  * @param mquant block quantizer

  3024.  * @param codingset set of VLC to decode data

  3025.  */

  3026. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  3027. {

  3028.     GetBitContext *gb = &v->s.gb;

  3029.     MpegEncContext *s = &v->s;

  3030.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  3031.     int run_diff, i;

  3032.     int16_t *dc_val;

  3033.     int16_t *ac_val, *ac_val2;

  3034.     int dcdiff;

  3035.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3036.     int a_avail = v->a_avail, c_avail = v->c_avail;

  3037.     int use_pred = s->ac_pred;

  3038.     int scale;

  3039.     int q1, q2 = 0;

  3040. 

  3041.     /* XXX: Guard against dumb values of mquant */

  3042.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  3043. 

  3044.     /* Set DC scale - y and c use the same */

  3045.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  3046.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  3047. 

  3048.     /* Get DC differential */

  3049.     if (n < 4) {

  3050.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3051.     } else {

  3052.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3053.     }

  3054.     if (dcdiff < 0){

  3055.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  3056.         return -1;

  3057.     }

  3058.     if (dcdiff)

  3059.     {

  3060.         if (dcdiff == 119 /* ESC index value */)

  3061.         {

  3062.             /* TODO: Optimize */

  3063.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  3064.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  3065.             else dcdiff = get_bits(gb, 8);

  3066.         }

  3067.         else

  3068.         {

  3069.             if (mquant == 1)

  3070.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  3071.             else if (mquant == 2)

  3072.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  3073.         }

  3074.         if (get_bits(gb, 1))

  3075.             dcdiff = -dcdiff;

  3076.     }

  3077. 

  3078.     /* Prediction */

  3079.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  3080.     *dc_val = dcdiff;

  3081. 

  3082.     /* Store the quantized DC coeff, used for prediction */

  3083. 

  3084.     if (n < 4) {

  3085.         block[0] = dcdiff * s->y_dc_scale;

  3086.     } else {

  3087.         block[0] = dcdiff * s->c_dc_scale;

  3088.     }

  3089.     /* Skip ? */

  3090.     run_diff = 0;

  3091.     i = 0;

  3092. 

  3093.     //AC Decoding

  3094.     i = 1;

  3095. 

  3096.     /* check if AC is needed at all and adjust direction if needed */

  3097.     if(!a_avail) dc_pred_dir = 1;

  3098.     if(!c_avail) dc_pred_dir = 0;

  3099.     if(!a_avail && !c_avail) use_pred = 0;

  3100.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3101.     ac_val2 = ac_val;

  3102. 

  3103.     scale = mquant * 2 + v->halfpq;

  3104. 

  3105.     if(dc_pred_dir) //left

  3106.         ac_val -= 16;

  3107.     else //top

  3108.         ac_val -= 16 * s->block_wrap[n];

  3109. 

  3110.     q1 = s->current_picture.qscale_table[mb_pos];

  3111.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  3112.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3113.     if(n && n<4) q2 = q1;

  3114. 

  3115.     if(coded) {

  3116.         int last = 0, skip, value;

  3117.         const int8_t *zz_table;

  3118.         int k;

  3119. 

  3120.         zz_table = vc1_simple_progressive_8x8_zz;

  3121. 

  3122.         while (!last) {

  3123.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3124.             i += skip;

  3125.             if(i > 63)

  3126.                 break;

  3127.             block[zz_table[i++]] = value;

  3128.         }

  3129. 

  3130.         /* apply AC prediction if needed */

  3131.         if(use_pred) {

  3132.             /* scale predictors if needed*/

  3133.             if(q2 && q1!=q2) {

  3134.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3135.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3136. 

  3137.                 if(dc_pred_dir) { //left

  3138.                     for(k = 1; k < 8; k++)

  3139.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3140.                 } else { //top

  3141.                     for(k = 1; k < 8; k++)

  3142.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3143.                 }

  3144.             } else {

  3145.                 if(dc_pred_dir) { //left

  3146.                     for(k = 1; k < 8; k++)

  3147.                         block[k << 3] += ac_val[k];

  3148.                 } else { //top

  3149.                     for(k = 1; k < 8; k++)

  3150.                         block[k] += ac_val[k + 8];

  3151.                 }

  3152.             }

  3153.         }

  3154.         /* save AC coeffs for further prediction */

  3155.         for(k = 1; k < 8; k++) {

  3156.             ac_val2[k] = block[k << 3];

  3157.             ac_val2[k + 8] = block[k];

  3158.         }

  3159. 

  3160.         /* scale AC coeffs */

  3161.         for(k = 1; k < 64; k++)

  3162.             if(block[k]) {

  3163.                 block[k] *= scale;

  3164.                 if(!v->pquantizer)

  3165.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3166.             }

  3167. 

  3168.         if(use_pred) i = 63;

  3169.     } else { // no AC coeffs

  3170.         int k;

  3171. 

  3172.         memset(ac_val2, 0, 16 * 2);

  3173.         if(dc_pred_dir) {//left

  3174.             if(use_pred) {

  3175.                 memcpy(ac_val2, ac_val, 8 * 2);

  3176.                 if(q2 && q1!=q2) {

  3177.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3178.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3179.                     for(k = 1; k < 8; k++)

  3180.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3181.                 }

  3182.             }

  3183.         } else {//top

  3184.             if(use_pred) {

  3185.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3186.                 if(q2 && q1!=q2) {

  3187.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3188.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3189.                     for(k = 1; k < 8; k++)

  3190.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3191.                 }

  3192.             }

  3193.         }

  3194. 

  3195.         /* apply AC prediction if needed */

  3196.         if(use_pred) {

  3197.             if(dc_pred_dir) { //left

  3198.                 for(k = 1; k < 8; k++) {

  3199.                     block[k << 3] = ac_val2[k] * scale;

  3200.                     if(!v->pquantizer && block[k << 3])

  3201.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  3202.                 }

  3203.             } else { //top

  3204.                 for(k = 1; k < 8; k++) {

  3205.                     block[k] = ac_val2[k + 8] * scale;

  3206.                     if(!v->pquantizer && block[k])

  3207.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  3208.                 }

  3209.             }

  3210.             i = 63;

  3211.         }

  3212.     }

  3213.     s->block_last_index[n] = i;

  3214. 

  3215.     return 0;

  3216. }

  3217. 

  3218. /** Decode P block

  3219.  */

  3220. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  3221. {

  3222.     MpegEncContext *s = &v->s;

  3223.     GetBitContext *gb = &s->gb;

  3224.     int i, j;

  3225.     int subblkpat = 0;

  3226.     int scale, off, idx, last, skip, value;

  3227.     int ttblk = ttmb & 7;

  3228. 

  3229.     if(ttmb == -1) {

  3230.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  3231.     }

  3232.     if(ttblk == TT_4X4) {

  3233.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3234.     }

  3235.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  3236.         subblkpat = decode012(gb);

  3237.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  3238.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  3239.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  3240.     }

  3241.     scale = 2 * mquant + v->halfpq;

  3242. 

  3243.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3244.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3245.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3246.         ttblk = TT_8X4;

  3247.     }

  3248.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3249.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3250.         ttblk = TT_4X8;

  3251.     }

  3252.     switch(ttblk) {

  3253.     case TT_8X8:

  3254.         i = 0;

  3255.         last = 0;

  3256.         while (!last) {

  3257.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3258.             i += skip;

  3259.             if(i > 63)

  3260.                 break;

  3261.             idx = vc1_simple_progressive_8x8_zz[i++];

  3262.             block[idx] = value * scale;

  3263.             if(!v->pquantizer)

  3264.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3265.         }

  3266.         s->dsp.vc1_inv_trans_8x8(block);

  3267.         break;

  3268.     case TT_4X4:

  3269.         for(j = 0; j < 4; j++) {

  3270.             last = subblkpat & (1 << (3 - j));

  3271.             i = 0;

  3272.             off = (j & 1) * 4 + (j & 2) * 16;

  3273.             while (!last) {

  3274.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3275.                 i += skip;

  3276.                 if(i > 15)

  3277.                     break;

  3278.                 idx = vc1_simple_progressive_4x4_zz[i++];

  3279.                 block[idx + off] = value * scale;

  3280.                 if(!v->pquantizer)

  3281.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3282.             }

  3283.             if(!(subblkpat & (1 << (3 - j))))

  3284.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3285.         }

  3286.         break;

  3287.     case TT_8X4:

  3288.         for(j = 0; j < 2; j++) {

  3289.             last = subblkpat & (1 << (1 - j));

  3290.             i = 0;

  3291.             off = j * 32;

  3292.             while (!last) {

  3293.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3294.                 i += skip;

  3295.                 if(i > 31)

  3296.                     break;

  3297.                 if(v->profile < PROFILE_ADVANCED)

  3298.                     idx = vc1_simple_progressive_8x4_zz[i++];

  3299.                 else

  3300.                     idx = vc1_adv_progressive_8x4_zz[i++];

  3301.                 block[idx + off] = value * scale;

  3302.                 if(!v->pquantizer)

  3303.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3304.             }

  3305.             if(!(subblkpat & (1 << (1 - j))))

  3306.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3307.         }

  3308.         break;

  3309.     case TT_4X8:

  3310.         for(j = 0; j < 2; j++) {

  3311.             last = subblkpat & (1 << (1 - j));

  3312.             i = 0;

  3313.             off = j * 4;

  3314.             while (!last) {

  3315.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3316.                 i += skip;

  3317.                 if(i > 31)

  3318.                     break;

  3319.                 if(v->profile < PROFILE_ADVANCED)

  3320.                     idx = vc1_simple_progressive_4x8_zz[i++];

  3321.                 else

  3322.                     idx = vc1_adv_progressive_4x8_zz[i++];

  3323.                 block[idx + off] = value * scale;

  3324.                 if(!v->pquantizer)

  3325.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3326.             }

  3327.             if(!(subblkpat & (1 << (1 - j))))

  3328.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3329.         }

  3330.         break;

  3331.     }

  3332.     return 0;

  3333. }

  3334. 

  3335. 

  3336. /** Decode one P-frame MB (in Simple/Main profile)

  3337.  */

  3338. static int vc1_decode_p_mb(VC1Context *v)

  3339. {

  3340.     MpegEncContext *s = &v->s;

  3341.     GetBitContext *gb = &s->gb;

  3342.     int i, j;

  3343.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3344.     int cbp; /* cbp decoding stuff */

  3345.     int mqdiff, mquant; /* MB quantization */

  3346.     int ttmb = v->ttfrm; /* MB Transform type */

  3347.     int status;

  3348. 

  3349.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3350.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3351.     int mb_has_coeffs = 1; /* last_flag */

  3352.     int dmv_x, dmv_y; /* Differential MV components */

  3353.     int index, index1; /* LUT indices */

  3354.     int val, sign; /* temp values */

  3355.     int first_block = 1;

  3356.     int dst_idx, off;

  3357.     int skipped, fourmv;

  3358. 

  3359.     mquant = v->pq; /* Loosy initialization */

  3360. 

  3361.     if (v->mv_type_is_raw)

  3362.         fourmv = get_bits1(gb);

  3363.     else

  3364.         fourmv = v->mv_type_mb_plane[mb_pos];

  3365.     if (v->skip_is_raw)

  3366.         skipped = get_bits1(gb);

  3367.     else

  3368.         skipped = v->s.mbskip_table[mb_pos];

  3369. 

  3370.     s->dsp.clear_blocks(s->block[0]);

  3371. 

  3372.     if (!fourmv) /* 1MV mode */

  3373.     {

  3374.         if (!skipped)

  3375.         {

  3376.             GET_MVDATA(dmv_x, dmv_y);

  3377. 

  3378.             if (s->mb_intra) {

  3379.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3380.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3381.             }

  3382.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3383.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3384. 

  3385.             /* FIXME Set DC val for inter block ? */

  3386.             if (s->mb_intra && !mb_has_coeffs)

  3387.             {

  3388.                 GET_MQUANT();

  3389.                 s->ac_pred = get_bits(gb, 1);

  3390.                 cbp = 0;

  3391.             }

  3392.             else if (mb_has_coeffs)

  3393.             {

  3394.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3395.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3396.                 GET_MQUANT();

  3397.             }

  3398.             else

  3399.             {

  3400.                 mquant = v->pq;

  3401.                 cbp = 0;

  3402.             }

  3403.             s->current_picture.qscale_table[mb_pos] = mquant;

  3404. 

  3405.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3406.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  3407.                                 VC1_TTMB_VLC_BITS, 2);

  3408.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3409.             dst_idx = 0;

  3410.             for (i=0; i<6; i++)

  3411.             {

  3412.                 s->dc_val[0][s->block_index[i]] = 0;

  3413.                 dst_idx += i >> 2;

  3414.                 val = ((cbp >> (5 - i)) & 1);

  3415.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3416.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3417.                 if(s->mb_intra) {

  3418.                     /* check if prediction blocks A and C are available */

  3419.                     v->a_avail = v->c_avail = 0;

  3420.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3421.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3422.                     if(i == 1 || i == 3 || s->mb_x)

  3423.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3424. 

  3425.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3426.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3427.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3428.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3429.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3430.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3431.                     if(v->pq >= 9 && v->overlap) {

  3432.                         if(v->c_avail)

  3433.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3434.                         if(v->a_avail)

  3435.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3436.                     }

  3437.                 } else if(val) {

  3438.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3439.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3440.                     first_block = 0;

  3441.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3442.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3443.                 }

  3444.             }

  3445.         }

  3446.         else //Skipped

  3447.         {

  3448.             s->mb_intra = 0;

  3449.             for(i = 0; i < 6; i++) {

  3450.                 v->mb_type[0][s->block_index[i]] = 0;

  3451.                 s->dc_val[0][s->block_index[i]] = 0;

  3452.             }

  3453.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3454.             s->current_picture.qscale_table[mb_pos] = 0;

  3455.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3456.             vc1_mc_1mv(v, 0);

  3457.             return 0;

  3458.         }

  3459.     } //1MV mode

  3460.     else //4MV mode

  3461.     {

  3462.         if (!skipped /* unskipped MB */)

  3463.         {

  3464.             int intra_count = 0, coded_inter = 0;

  3465.             int is_intra[6], is_coded[6];

  3466.             /* Get CBPCY */

  3467.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3468.             for (i=0; i<6; i++)

  3469.             {

  3470.                 val = ((cbp >> (5 - i)) & 1);

  3471.                 s->dc_val[0][s->block_index[i]] = 0;

  3472.                 s->mb_intra = 0;

  3473.                 if(i < 4) {

  3474.                     dmv_x = dmv_y = 0;

  3475.                     s->mb_intra = 0;

  3476.                     mb_has_coeffs = 0;

  3477.                     if(val) {

  3478.                         GET_MVDATA(dmv_x, dmv_y);

  3479.                     }

  3480.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3481.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3482.                     intra_count += s->mb_intra;

  3483.                     is_intra[i] = s->mb_intra;

  3484.                     is_coded[i] = mb_has_coeffs;

  3485.                 }

  3486.                 if(i&4){

  3487.                     is_intra[i] = (intra_count >= 3);

  3488.                     is_coded[i] = val;

  3489.                 }

  3490.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3491.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3492.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3493.             }

  3494.             // if there are no coded blocks then don't do anything more

  3495.             if(!intra_count && !coded_inter) return 0;

  3496.             dst_idx = 0;

  3497.             GET_MQUANT();

  3498.             s->current_picture.qscale_table[mb_pos] = mquant;

  3499.             /* test if block is intra and has pred */

  3500.             {

  3501.                 int intrapred = 0;

  3502.                 for(i=0; i<6; i++)

  3503.                     if(is_intra[i]) {

  3504.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3505.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3506.                             intrapred = 1;

  3507.                             break;

  3508.                         }

  3509.                     }

  3510.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3511.                 else s->ac_pred = 0;

  3512.             }

  3513.             if (!v->ttmbf && coded_inter)

  3514.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3515.             for (i=0; i<6; i++)

  3516.             {

  3517.                 dst_idx += i >> 2;

  3518.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3519.                 s->mb_intra = is_intra[i];

  3520.                 if (is_intra[i]) {

  3521.                     /* check if prediction blocks A and C are available */

  3522.                     v->a_avail = v->c_avail = 0;

  3523.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3524.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3525.                     if(i == 1 || i == 3 || s->mb_x)

  3526.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3527. 

  3528.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3529.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3530.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3531.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3532.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3533.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3534.                     if(v->pq >= 9 && v->overlap) {

  3535.                         if(v->c_avail)

  3536.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3537.                         if(v->a_avail)

  3538.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3539.                     }

  3540.                 } else if(is_coded[i]) {

  3541.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3542.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3543.                     first_block = 0;

  3544.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3545.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3546.                 }

  3547.             }

  3548.             return status;

  3549.         }

  3550.         else //Skipped MB

  3551.         {

  3552.             s->mb_intra = 0;

  3553.             s->current_picture.qscale_table[mb_pos] = 0;

  3554.             for (i=0; i<6; i++) {

  3555.                 v->mb_type[0][s->block_index[i]] = 0;

  3556.                 s->dc_val[0][s->block_index[i]] = 0;

  3557.             }

  3558.             for (i=0; i<4; i++)

  3559.             {

  3560.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3561.                 vc1_mc_4mv_luma(v, i);

  3562.             }

  3563.             vc1_mc_4mv_chroma(v);

  3564.             s->current_picture.qscale_table[mb_pos] = 0;

  3565.             return 0;

  3566.         }

  3567.     }

  3568. 

  3569.     /* Should never happen */

  3570.     return -1;

  3571. }

  3572. 

  3573. /** Decode one B-frame MB (in Main profile)

  3574.  */

  3575. static void vc1_decode_b_mb(VC1Context *v)

  3576. {

  3577.     MpegEncContext *s = &v->s;

  3578.     GetBitContext *gb = &s->gb;

  3579.     int i, j;

  3580.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3581.     int cbp = 0; /* cbp decoding stuff */

  3582.     int mqdiff, mquant; /* MB quantization */

  3583.     int ttmb = v->ttfrm; /* MB Transform type */

  3584. 

  3585.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3586.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3587.     int mb_has_coeffs = 0; /* last_flag */

  3588.     int index, index1; /* LUT indices */

  3589.     int val, sign; /* temp values */

  3590.     int first_block = 1;

  3591.     int dst_idx, off;

  3592.     int skipped, direct;

  3593.     int dmv_x[2], dmv_y[2];

  3594.     int bmvtype = BMV_TYPE_BACKWARD;

  3595. 

  3596.     mquant = v->pq; /* Loosy initialization */

  3597.     s->mb_intra = 0;

  3598. 

  3599.     if (v->dmb_is_raw)

  3600.         direct = get_bits1(gb);

  3601.     else

  3602.         direct = v->direct_mb_plane[mb_pos];

  3603.     if (v->skip_is_raw)

  3604.         skipped = get_bits1(gb);

  3605.     else

  3606.         skipped = v->s.mbskip_table[mb_pos];

  3607. 

  3608.     s->dsp.clear_blocks(s->block[0]);

  3609.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3610.     for(i = 0; i < 6; i++) {

  3611.         v->mb_type[0][s->block_index[i]] = 0;

  3612.         s->dc_val[0][s->block_index[i]] = 0;

  3613.     }

  3614.     s->current_picture.qscale_table[mb_pos] = 0;

  3615. 

  3616.     if (!direct) {

  3617.         if (!skipped) {

  3618.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3619.             dmv_x[1] = dmv_x[0];

  3620.             dmv_y[1] = dmv_y[0];

  3621.         }

  3622.         if(skipped || !s->mb_intra) {

  3623.             bmvtype = decode012(gb);

  3624.             switch(bmvtype) {

  3625.             case 0:

  3626.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3627.                 break;

  3628.             case 1:

  3629.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3630.                 break;

  3631.             case 2:

  3632.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3633.                 dmv_x[0] = dmv_y[0] = 0;

  3634.             }

  3635.         }

  3636.     }

  3637.     for(i = 0; i < 6; i++)

  3638.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3639. 

  3640.     if (skipped) {

  3641.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3642.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3643.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3644.         return;

  3645.     }

  3646.     if (direct) {

  3647.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3648.         GET_MQUANT();

  3649.         s->mb_intra = 0;

  3650.         mb_has_coeffs = 0;

  3651.         s->current_picture.qscale_table[mb_pos] = mquant;

  3652.         if(!v->ttmbf)

  3653.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3654.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3655.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3656.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3657.     } else {

  3658.         if(!mb_has_coeffs && !s->mb_intra) {

  3659.             /* no coded blocks - effectively skipped */

  3660.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3661.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3662.             return;

  3663.         }

  3664.         if(s->mb_intra && !mb_has_coeffs) {

  3665.             GET_MQUANT();

  3666.             s->current_picture.qscale_table[mb_pos] = mquant;

  3667.             s->ac_pred = get_bits1(gb);

  3668.             cbp = 0;

  3669.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3670.         } else {

  3671.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3672.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3673.                 if(!mb_has_coeffs) {

  3674.                     /* interpolated skipped block */

  3675.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3676.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3677.                     return;

  3678.                 }

  3679.             }

  3680.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3681.             if(!s->mb_intra) {

  3682.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3683.             }

  3684.             if(s->mb_intra)

  3685.                 s->ac_pred = get_bits1(gb);

  3686.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3687.             GET_MQUANT();

  3688.             s->current_picture.qscale_table[mb_pos] = mquant;

  3689.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3690.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3691.         }

  3692.     }

  3693.     dst_idx = 0;

  3694.     for (i=0; i<6; i++)

  3695.     {

  3696.         s->dc_val[0][s->block_index[i]] = 0;

  3697.         dst_idx += i >> 2;

  3698.         val = ((cbp >> (5 - i)) & 1);

  3699.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3700.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3701.         if(s->mb_intra) {

  3702.             /* check if prediction blocks A and C are available */

  3703.             v->a_avail = v->c_avail = 0;

  3704.             if(i == 2 || i == 3 || !s->first_slice_line)

  3705.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3706.             if(i == 1 || i == 3 || s->mb_x)

  3707.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3708. 

  3709.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3710.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3711.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3712.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3713.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3714.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3715.         } else if(val) {

  3716.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3717.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3718.             first_block = 0;

  3719.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3720.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3721.         }

  3722.     }

  3723. }

  3724. 

  3725. /** Decode blocks of I-frame

  3726.  */

  3727. static void vc1_decode_i_blocks(VC1Context *v)

  3728. {

  3729.     int k, j;

  3730.     MpegEncContext *s = &v->s;

  3731.     int cbp, val;

  3732.     uint8_t *coded_val;

  3733.     int mb_pos;

  3734. 

  3735.     /* select codingmode used for VLC tables selection */

  3736.     switch(v->y_ac_table_index){

  3737.     case 0:

  3738.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3739.         break;

  3740.     case 1:

  3741.         v->codingset = CS_HIGH_MOT_INTRA;

  3742.         break;

  3743.     case 2:

  3744.         v->codingset = CS_MID_RATE_INTRA;

  3745.         break;

  3746.     }

  3747. 

  3748.     switch(v->c_ac_table_index){

  3749.     case 0:

  3750.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3751.         break;

  3752.     case 1:

  3753.         v->codingset2 = CS_HIGH_MOT_INTER;

  3754.         break;

  3755.     case 2:

  3756.         v->codingset2 = CS_MID_RATE_INTER;

  3757.         break;

  3758.     }

  3759. 

  3760.     /* Set DC scale - y and c use the same */

  3761.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3762.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3763. 

  3764.     //do frame decode

  3765.     s->mb_x = s->mb_y = 0;

  3766.     s->mb_intra = 1;

  3767.     s->first_slice_line = 1;

  3768.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3769.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3770.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3771.             ff_init_block_index(s);

  3772.             ff_update_block_index(s);

  3773.             s->dsp.clear_blocks(s->block[0]);

  3774.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3775.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3776.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3777.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3778.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3779. 

  3780.             // do actual MB decoding and displaying

  3781.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3782.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3783. 

  3784.             for(k = 0; k < 6; k++) {

  3785.                 val = ((cbp >> (5 - k)) & 1);

  3786. 

  3787.                 if (k < 4) {

  3788.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3789.                     val = val ^ pred;

  3790.                     *coded_val = val;

  3791.                 }

  3792.                 cbp |= val << (5 - k);

  3793. 

  3794.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3795. 

  3796.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3797.                 if(v->pq >= 9 && v->overlap) {

  3798.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3799.                 }

  3800.             }

  3801. 

  3802.             vc1_put_block(v, s->block);

  3803.             if(v->pq >= 9 && v->overlap) {

  3804.                 if(s->mb_x) {

  3805.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3806.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3807.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3808.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3809.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3810.                     }

  3811.                 }

  3812.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3813.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3814.                 if(!s->first_slice_line) {

  3815.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3816.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3817.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3818.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3819.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3820.                     }

  3821.                 }

  3822.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3823.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3824.             }

  3825. 

  3826.             if(get_bits_count(&s->gb) > v->bits) {

  3827.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3828.                 return;

  3829.             }

  3830.         }

  3831.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3832.         s->first_slice_line = 0;

  3833.     }

  3834. }

  3835. 

  3836. /** Decode blocks of I-frame for advanced profile

  3837.  */

  3838. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3839. {

  3840.     int k, j;

  3841.     MpegEncContext *s = &v->s;

  3842.     int cbp, val;

  3843.     uint8_t *coded_val;

  3844.     int mb_pos;

  3845.     int mquant = v->pq;

  3846.     int mqdiff;

  3847.     int overlap;

  3848.     GetBitContext *gb = &s->gb;

  3849. 

  3850.     /* select codingmode used for VLC tables selection */

  3851.     switch(v->y_ac_table_index){

  3852.     case 0:

  3853.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3854.         break;

  3855.     case 1:

  3856.         v->codingset = CS_HIGH_MOT_INTRA;

  3857.         break;

  3858.     case 2:

  3859.         v->codingset = CS_MID_RATE_INTRA;

  3860.         break;

  3861.     }

  3862. 

  3863.     switch(v->c_ac_table_index){

  3864.     case 0:

  3865.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3866.         break;

  3867.     case 1:

  3868.         v->codingset2 = CS_HIGH_MOT_INTER;

  3869.         break;

  3870.     case 2:

  3871.         v->codingset2 = CS_MID_RATE_INTER;

  3872.         break;

  3873.     }

  3874. 

  3875.     //do frame decode

  3876.     s->mb_x = s->mb_y = 0;

  3877.     s->mb_intra = 1;

  3878.     s->first_slice_line = 1;

  3879.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3880.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3881.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3882.             ff_init_block_index(s);

  3883.             ff_update_block_index(s);

  3884.             s->dsp.clear_blocks(s->block[0]);

  3885.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3886.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3887.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3888.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3889. 

  3890.             // do actual MB decoding and displaying

  3891.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3892.             if(v->acpred_is_raw)

  3893.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3894.             else

  3895.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3896. 

  3897.             if(v->condover == CONDOVER_SELECT) {

  3898.                 if(v->overflg_is_raw)

  3899.                     overlap = get_bits(&v->s.gb, 1);

  3900.                 else

  3901.                     overlap = v->over_flags_plane[mb_pos];

  3902.             } else

  3903.                 overlap = (v->condover == CONDOVER_ALL);

  3904. 

  3905.             GET_MQUANT();

  3906. 

  3907.             s->current_picture.qscale_table[mb_pos] = mquant;

  3908.             /* Set DC scale - y and c use the same */

  3909.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3910.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3911. 

  3912.             for(k = 0; k < 6; k++) {

  3913.                 val = ((cbp >> (5 - k)) & 1);

  3914. 

  3915.                 if (k < 4) {

  3916.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3917.                     val = val ^ pred;

  3918.                     *coded_val = val;

  3919.                 }

  3920.                 cbp |= val << (5 - k);

  3921. 

  3922.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3923.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3924. 

  3925.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3926. 

  3927.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3928.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3929.             }

  3930. 

  3931.             vc1_put_block(v, s->block);

  3932.             if(overlap) {

  3933.                 if(s->mb_x) {

  3934.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3935.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3936.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3937.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3938.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3939.                     }

  3940.                 }

  3941.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3942.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3943.                 if(!s->first_slice_line) {

  3944.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3945.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3946.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3947.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3948.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3949.                     }

  3950.                 }

  3951.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3952.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3953.             }

  3954. 

  3955.             if(get_bits_count(&s->gb) > v->bits) {

  3956.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3957.                 return;

  3958.             }

  3959.         }

  3960.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3961.         s->first_slice_line = 0;

  3962.     }

  3963. }

  3964. 

  3965. static void vc1_decode_p_blocks(VC1Context *v)

  3966. {

  3967.     MpegEncContext *s = &v->s;

  3968. 

  3969.     /* select codingmode used for VLC tables selection */

  3970.     switch(v->c_ac_table_index){

  3971.     case 0:

  3972.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3973.         break;

  3974.     case 1:

  3975.         v->codingset = CS_HIGH_MOT_INTRA;

  3976.         break;

  3977.     case 2:

  3978.         v->codingset = CS_MID_RATE_INTRA;

  3979.         break;

  3980.     }

  3981. 

  3982.     switch(v->c_ac_table_index){

  3983.     case 0:

  3984.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3985.         break;

  3986.     case 1:

  3987.         v->codingset2 = CS_HIGH_MOT_INTER;

  3988.         break;

  3989.     case 2:

  3990.         v->codingset2 = CS_MID_RATE_INTER;

  3991.         break;

  3992.     }

  3993. 

  3994.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3995.     s->first_slice_line = 1;

  3996.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3997.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3998.             ff_init_block_index(s);

  3999.             ff_update_block_index(s);

  4000.             s->dsp.clear_blocks(s->block[0]);

  4001. 

  4002.             vc1_decode_p_mb(v);

  4003.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4004.                 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);

  4005.                 return;

  4006.             }

  4007.         }

  4008.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4009.         s->first_slice_line = 0;

  4010.     }

  4011. }

  4012. 

  4013. static void vc1_decode_b_blocks(VC1Context *v)

  4014. {

  4015.     MpegEncContext *s = &v->s;

  4016. 

  4017.     /* select codingmode used for VLC tables selection */

  4018.     switch(v->c_ac_table_index){

  4019.     case 0:

  4020.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4021.         break;

  4022.     case 1:

  4023.         v->codingset = CS_HIGH_MOT_INTRA;

  4024.         break;

  4025.     case 2:

  4026.         v->codingset = CS_MID_RATE_INTRA;

  4027.         break;

  4028.     }

  4029. 

  4030.     switch(v->c_ac_table_index){

  4031.     case 0:

  4032.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4033.         break;

  4034.     case 1:

  4035.         v->codingset2 = CS_HIGH_MOT_INTER;

  4036.         break;

  4037.     case 2:

  4038.         v->codingset2 = CS_MID_RATE_INTER;

  4039.         break;

  4040.     }

  4041. 

  4042.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4043.     s->first_slice_line = 1;

  4044.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4045.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  4046.             ff_init_block_index(s);

  4047.             ff_update_block_index(s);

  4048.             s->dsp.clear_blocks(s->block[0]);

  4049. 

  4050.             vc1_decode_b_mb(v);

  4051.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4052.                 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);

  4053.                 return;

  4054.             }

  4055.         }

  4056.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4057.         s->first_slice_line = 0;

  4058.     }

  4059. }

  4060. 

  4061. static void vc1_decode_skip_blocks(VC1Context *v)

  4062. {

  4063.     MpegEncContext *s = &v->s;

  4064. 

  4065.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  4066.     s->first_slice_line = 1;

  4067.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  4068.         s->mb_x = 0;

  4069.         ff_init_block_index(s);

  4070.         ff_update_block_index(s);

  4071.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  4072.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4073.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  4074.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4075.         s->first_slice_line = 0;

  4076.     }

  4077.     s->pict_type = P_TYPE;

  4078. }

  4079. 

  4080. static void vc1_decode_blocks(VC1Context *v)

  4081. {

  4082. 

  4083.     v->s.esc3_level_length = 0;

  4084. 

  4085.     switch(v->s.pict_type) {

  4086.     case I_TYPE:

  4087.         if(v->profile == PROFILE_ADVANCED)

  4088.             vc1_decode_i_blocks_adv(v);

  4089.         else

  4090.             vc1_decode_i_blocks(v);

  4091.         break;

  4092.     case P_TYPE:

  4093.         if(v->p_frame_skipped)

  4094.             vc1_decode_skip_blocks(v);

  4095.         else

  4096.             vc1_decode_p_blocks(v);

  4097.         break;

  4098.     case B_TYPE:

  4099.         if(v->bi_type){

  4100.             if(v->profile == PROFILE_ADVANCED)

  4101.                 vc1_decode_i_blocks_adv(v);

  4102.             else

  4103.                 vc1_decode_i_blocks(v);

  4104.         }else

  4105.             vc1_decode_b_blocks(v);

  4106.         break;

  4107.     }

  4108. }

  4109. 

  4110. #define IS_MARKER(x) ((((x) & ~0xFF) == VC1_CODE_RES0) && ((x) != VC1_CODE_ESCAPE))

  4111. 

  4112. /** Find VC-1 marker in buffer

  4113.  * @return position where next marker starts or end of buffer if no marker found

  4114.  */

  4115. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  4116. {

  4117.     uint32_t mrk = 0xFFFFFFFF;

  4118. 

  4119.     if(end-src < 4) return end;

  4120.     while(src < end){

  4121.         mrk = (mrk << 8) | *src++;

  4122.         if(IS_MARKER(mrk))

  4123.             return src-4;

  4124.     }

  4125.     return end;

  4126. }

  4127. 

  4128. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  4129. {

  4130.     int dsize = 0, i;

  4131. 

  4132.     if(size < 4){

  4133.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  4134.         return size;

  4135.     }

  4136.     for(i = 0; i < size; i++, src++) {

  4137.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  4138.             dst[dsize++] = src[1];

  4139.             src++;

  4140.             i++;

  4141.         } else

  4142.             dst[dsize++] = *src;

  4143.     }

  4144.     return dsize;

  4145. }

  4146. 

  4147. /** Initialize a VC1/WMV3 decoder

  4148.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4149.  * @todo TODO: Decypher remaining bits in extra_data

  4150.  */

  4151. static int vc1_decode_init(AVCodecContext *avctx)

  4152. {

  4153.     VC1Context *v = avctx->priv_data;

  4154.     MpegEncContext *s = &v->s;

  4155.     GetBitContext gb;

  4156. 

  4157.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  4158.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  4159.         avctx->pix_fmt = PIX_FMT_YUV420P;

  4160.     else

  4161.         avctx->pix_fmt = PIX_FMT_GRAY8;

  4162.     v->s.avctx = avctx;

  4163.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  4164.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  4165. 

  4166.     if(ff_h263_decode_init(avctx) < 0)

  4167.         return -1;

  4168.     if (vc1_init_common(v) < 0) return -1;

  4169. 

  4170.     avctx->coded_width = avctx->width;

  4171.     avctx->coded_height = avctx->height;

  4172.     if (avctx->codec_id == CODEC_ID_WMV3)

  4173.     {

  4174.         int count = 0;

  4175. 

  4176.         // looks like WMV3 has a sequence header stored in the extradata

  4177.         // advanced sequence header may be before the first frame

  4178.         // the last byte of the extradata is a version number, 1 for the

  4179.         // samples we can decode

  4180. 

  4181.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  4182. 

  4183.         if (decode_sequence_header(avctx, &gb) < 0)

  4184.           return -1;

  4185. 

  4186.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  4187.         if (count>0)

  4188.         {

  4189.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  4190.                    count, get_bits(&gb, count));

  4191.         }

  4192.         else if (count < 0)

  4193.         {

  4194.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  4195.         }

  4196.     } else { // VC1/WVC1

  4197.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  4198.         uint8_t *next; int size, buf2_size;

  4199.         uint8_t *buf2 = NULL;

  4200.         int seq_inited = 0, ep_inited = 0;

  4201. 

  4202.         if(avctx->extradata_size < 16) {

  4203.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  4204.             return -1;

  4205.         }

  4206. 

  4207.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4208.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  4209.         next = start;

  4210.         for(; next < end; start = next){

  4211.             next = find_next_marker(start + 4, end);

  4212.             size = next - start - 4;

  4213.             if(size <= 0) continue;

  4214.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  4215.             init_get_bits(&gb, buf2, buf2_size * 8);

  4216.             switch(AV_RB32(start)){

  4217.             case VC1_CODE_SEQHDR:

  4218.                 if(decode_sequence_header(avctx, &gb) < 0){

  4219.                     av_free(buf2);

  4220.                     return -1;

  4221.                 }

  4222.                 seq_inited = 1;

  4223.                 break;

  4224.             case VC1_CODE_ENTRYPOINT:

  4225.                 if(decode_entry_point(avctx, &gb) < 0){

  4226.                     av_free(buf2);

  4227.                     return -1;

  4228.                 }

  4229.                 ep_inited = 1;

  4230.                 break;

  4231.             }

  4232.         }

  4233.         av_free(buf2);

  4234.         if(!seq_inited || !ep_inited){

  4235.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  4236.             return -1;

  4237.         }

  4238.     }

  4239.     avctx->has_b_frames= !!(avctx->max_b_frames);

  4240.     s->low_delay = !avctx->has_b_frames;

  4241. 

  4242.     s->mb_width = (avctx->coded_width+15)>>4;

  4243.     s->mb_height = (avctx->coded_height+15)>>4;

  4244. 

  4245.     /* Allocate mb bitplanes */

  4246.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4247.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  4248.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  4249.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  4250. 

  4251.     /* allocate block type info in that way so it could be used with s->block_index[] */

  4252.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  4253.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  4254.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  4255.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  4256. 

  4257.     /* Init coded blocks info */

  4258.     if (v->profile == PROFILE_ADVANCED)

  4259.     {

  4260. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  4261. //            return -1;

  4262. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  4263. //            return -1;

  4264.     }

  4265. 

  4266.     return 0;

  4267. }

  4268. 

  4269. 

  4270. /** Decode a VC1/WMV3 frame

  4271.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  4272.  */

  4273. static int vc1_decode_frame(AVCodecContext *avctx,

  4274.                             void *data, int *data_size,

  4275.                             uint8_t *buf, int buf_size)

  4276. {

  4277.     VC1Context *v = avctx->priv_data;

  4278.     MpegEncContext *s = &v->s;

  4279.     AVFrame *pict = data;

  4280.     uint8_t *buf2 = NULL;

  4281. 

  4282.     /* no supplementary picture */

  4283.     if (buf_size == 0) {

  4284.         /* special case for last picture */

  4285.         if (s->low_delay==0 && s->next_picture_ptr) {

  4286.             *pict= *(AVFrame*)s->next_picture_ptr;

  4287.             s->next_picture_ptr= NULL;

  4288. 

  4289.             *data_size = sizeof(AVFrame);

  4290.         }

  4291. 

  4292.         return 0;

  4293.     }

  4294. 

  4295.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  4296.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4297.         int i= ff_find_unused_picture(s, 0);

  4298.         s->current_picture_ptr= &s->picture[i];

  4299.     }

  4300. 

  4301.     //for advanced profile we may need to parse and unescape data

  4302.     if (avctx->codec_id == CODEC_ID_VC1) {

  4303.         int buf_size2 = 0;

  4304.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4305. 

  4306.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4307.             uint8_t *dst = buf2, *start, *end, *next;

  4308.             int size;

  4309. 

  4310.             next = buf;

  4311.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4312.                 next = find_next_marker(start + 4, end);

  4313.                 size = next - start - 4;

  4314.                 if(size <= 0) continue;

  4315.                 switch(AV_RB32(start)){

  4316.                 case VC1_CODE_FRAME:

  4317.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4318.                     break;

  4319.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4320.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4321.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4322.                     decode_entry_point(avctx, &s->gb);

  4323.                     break;

  4324.                 case VC1_CODE_SLICE:

  4325.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4326.                     av_free(buf2);

  4327.                     return -1;

  4328.                 }

  4329.             }

  4330.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4331.             uint8_t *divider;

  4332. 

  4333.             divider = find_next_marker(buf, buf + buf_size);

  4334.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4335.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4336.                 return -1;

  4337.             }

  4338. 

  4339.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4340.             // TODO

  4341.             av_free(buf2);return -1;

  4342.         }else{

  4343.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4344.         }

  4345.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4346.     } else

  4347.         init_get_bits(&s->gb, buf, buf_size*8);

  4348.     // do parse frame header

  4349.     if(v->profile < PROFILE_ADVANCED) {

  4350.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4351.             av_free(buf2);

  4352.             return -1;

  4353.         }

  4354.     } else {

  4355.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4356.             av_free(buf2);

  4357.             return -1;

  4358.         }

  4359.     }

  4360. 

  4361.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4362.         av_free(buf2);

  4363.         return -1;

  4364.     }

  4365. 

  4366.     // for hurry_up==5

  4367.     s->current_picture.pict_type= s->pict_type;

  4368.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4369. 

  4370.     /* skip B-frames if we don't have reference frames */

  4371.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4372.         av_free(buf2);

  4373.         return -1;//buf_size;

  4374.     }

  4375.     /* skip b frames if we are in a hurry */

  4376.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4377.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4378.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4379.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4380.         av_free(buf2);

  4381.         return buf_size;

  4382.     }

  4383.     /* skip everything if we are in a hurry>=5 */

  4384.     if(avctx->hurry_up>=5) {

  4385.         av_free(buf2);

  4386.         return -1;//buf_size;

  4387.     }

  4388. 

  4389.     if(s->next_p_frame_damaged){

  4390.         if(s->pict_type==B_TYPE)

  4391.             return buf_size;

  4392.         else

  4393.             s->next_p_frame_damaged=0;

  4394.     }

  4395. 

  4396.     if(MPV_frame_start(s, avctx) < 0) {

  4397.         av_free(buf2);

  4398.         return -1;

  4399.     }

  4400. 

  4401.     ff_er_frame_start(s);

  4402. 

  4403.     v->bits = buf_size * 8;

  4404.     vc1_decode_blocks(v);

  4405. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4406. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4407. //      return -1;

  4408.     ff_er_frame_end(s);

  4409. 

  4410.     MPV_frame_end(s);

  4411. 

  4412. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4413. assert(s->current_picture.pict_type == s->pict_type);

  4414.     if (s->pict_type == B_TYPE || s->low_delay) {

  4415.         *pict= *(AVFrame*)s->current_picture_ptr;

  4416.     } else if (s->last_picture_ptr != NULL) {

  4417.         *pict= *(AVFrame*)s->last_picture_ptr;

  4418.     }

  4419. 

  4420.     if(s->last_picture_ptr || s->low_delay){

  4421.         *data_size = sizeof(AVFrame);

  4422.         ff_print_debug_info(s, pict);

  4423.     }

  4424. 

  4425.     /* Return the Picture timestamp as the frame number */

  4426.     /* we substract 1 because it is added on utils.c    */

  4427.     avctx->frame_number = s->picture_number - 1;

  4428. 

  4429.     av_free(buf2);

  4430.     return buf_size;

  4431. }

  4432. 

  4433. 

  4434. /** Close a VC1/WMV3 decoder

  4435.  * @warning Initial try at using MpegEncContext stuff

  4436.  */

  4437. static int vc1_decode_end(AVCodecContext *avctx)

  4438. {

  4439.     VC1Context *v = avctx->priv_data;

  4440. 

  4441.     av_freep(&v->hrd_rate);

  4442.     av_freep(&v->hrd_buffer);

  4443.     MPV_common_end(&v->s);

  4444.     av_freep(&v->mv_type_mb_plane);

  4445.     av_freep(&v->direct_mb_plane);

  4446.     av_freep(&v->acpred_plane);

  4447.     av_freep(&v->over_flags_plane);

  4448.     av_freep(&v->mb_type_base);

  4449.     return 0;

  4450. }

  4451. 

  4452. 

  4453. AVCodec vc1_decoder = {

  4454.     "vc1",

  4455.     CODEC_TYPE_VIDEO,

  4456.     CODEC_ID_VC1,

  4457.     sizeof(VC1Context),

  4458.     vc1_decode_init,

  4459.     NULL,

  4460.     vc1_decode_end,

  4461.     vc1_decode_frame,

  4462.     CODEC_CAP_DELAY,

  4463.     NULL

  4464. };

  4465. 

  4466. AVCodec wmv3_decoder = {

  4467.     "wmv3",

  4468.     CODEC_TYPE_VIDEO,

  4469.     CODEC_ID_WMV3,

  4470.     sizeof(VC1Context),

  4471.     vc1_decode_init,

  4472.     NULL,

  4473.     vc1_decode_end,

  4474.     vc1_decode_frame,

  4475.     CODEC_CAP_DELAY,

  4476.     NULL

  4477. };