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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 library is free software; you can redistribute it and/or

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

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

  9.  * version 2 of the License, or (at your option) any later version.

  10.  *

  11.  * This library is distributed in the hope that it will be useful,

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

  17.  * License along with this library; if not, write to the Free Software

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

  19.  *

  20.  */

  21. 

  22. /**

  23.  * @file vc1.c

  24.  * VC-1 and WMV3 decoder

  25.  *

  26.  */

  27. #include "common.h"

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1data.h"

  32. #include "vc1acdata.h"

  33. 

  34. #undef NDEBUG

  35. #include <assert.h>

  36. 

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

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

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

  40. #define MB_INTRA_VLC_BITS 9

  41. extern VLC ff_msmp4_mb_i_vlc;

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

  43. #define DC_VLC_BITS 9

  44. #define AC_VLC_BITS 9

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

  46. 

  47. 

  48. /** Available Profiles */

  49. //@{

  50. enum Profile {

  51.     PROFILE_SIMPLE,

  52.     PROFILE_MAIN,

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

  54.     PROFILE_ADVANCED

  55. };

  56. //@}

  57. 

  58. /** Sequence quantizer mode */

  59. //@{

  60. enum QuantMode {

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

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

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

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

  65. };

  66. //@}

  67. 

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

  69. //@{

  70. enum DQProfile {

  71.     DQPROFILE_FOUR_EDGES,

  72.     DQPROFILE_DOUBLE_EDGES,

  73.     DQPROFILE_SINGLE_EDGE,

  74.     DQPROFILE_ALL_MBS

  75. };

  76. //@}

  77. 

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

  79.  */

  80. //@{

  81. enum DQSingleEdge {

  82.     DQSINGLE_BEDGE_LEFT,

  83.     DQSINGLE_BEDGE_TOP,

  84.     DQSINGLE_BEDGE_RIGHT,

  85.     DQSINGLE_BEDGE_BOTTOM

  86. };

  87. //@}

  88. 

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

  90. //@{

  91. enum DQDoubleEdge {

  92.     DQDOUBLE_BEDGE_TOPLEFT,

  93.     DQDOUBLE_BEDGE_TOPRIGHT,

  94.     DQDOUBLE_BEDGE_BOTTOMRIGHT,

  95.     DQDOUBLE_BEDGE_BOTTOMLEFT

  96. };

  97. //@}

  98. 

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

  100. //@{

  101. enum MVModes {

  102.     MV_PMODE_1MV_HPEL_BILIN,

  103.     MV_PMODE_1MV,

  104.     MV_PMODE_1MV_HPEL,

  105.     MV_PMODE_MIXED_MV,

  106.     MV_PMODE_INTENSITY_COMP

  107. };

  108. //@}

  109. 

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

  111. //@{

  112. enum BMVTypes {

  113.     BMV_TYPE_BACKWARD,

  114.     BMV_TYPE_FORWARD,

  115.     BMV_TYPE_INTERPOLATED = 3 //XXX: ??

  116. };

  117. //@}

  118. 

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

  120. //@{

  121. enum TransformTypes {

  122.     TT_8X8,

  123.     TT_8X4_BOTTOM,

  124.     TT_8X4_TOP,

  125.     TT_8X4, //Both halves

  126.     TT_4X8_RIGHT,

  127.     TT_4X8_LEFT,

  128.     TT_4X8, //Both halves

  129.     TT_4X4

  130. };

  131. //@}

  132. 

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

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

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

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

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

  138. };

  139. 

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

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

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

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

  144. };

  145. 

  146. /** One more frame type */

  147. #define BI_TYPE 7

  148. 

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

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

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

  152.   {  /* Implicit quantizer */

  153.      0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,

  154.     13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31

  155.   },

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

  157.      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  158.     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

  159.   },

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

  161.      0,  1,  1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,

  162.     14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31

  163.   }

  164. };

  165. 

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

  167.  *  @todo TODO move this into the context

  168.  */

  169. //@{

  170. #define VC1_BFRACTION_VLC_BITS 7

  171. static VLC vc1_bfraction_vlc;

  172. #define VC1_IMODE_VLC_BITS 4

  173. static VLC vc1_imode_vlc;

  174. #define VC1_NORM2_VLC_BITS 3

  175. static VLC vc1_norm2_vlc;

  176. #define VC1_NORM6_VLC_BITS 9

  177. static VLC vc1_norm6_vlc;

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

  179. #define VC1_TTMB_VLC_BITS 9 //12

  180. static VLC vc1_ttmb_vlc[3];

  181. #define VC1_MV_DIFF_VLC_BITS 9 //15

  182. static VLC vc1_mv_diff_vlc[4];

  183. #define VC1_CBPCY_P_VLC_BITS 9 //14

  184. static VLC vc1_cbpcy_p_vlc[4];

  185. #define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6

  186. static VLC vc1_4mv_block_pattern_vlc[4];

  187. #define VC1_TTBLK_VLC_BITS 5

  188. static VLC vc1_ttblk_vlc[3];

  189. #define VC1_SUBBLKPAT_VLC_BITS 6

  190. static VLC vc1_subblkpat_vlc[3];

  191. 

  192. static VLC vc1_ac_coeff_table[8];

  193. //@}

  194. 

  195. enum CodingSet {

  196.     CS_HIGH_MOT_INTRA = 0,

  197.     CS_HIGH_MOT_INTER,

  198.     CS_LOW_MOT_INTRA,

  199.     CS_LOW_MOT_INTER,

  200.     CS_MID_RATE_INTRA,

  201.     CS_MID_RATE_INTER,

  202.     CS_HIGH_RATE_INTRA,

  203.     CS_HIGH_RATE_INTER

  204. };

  205. 

  206. /** Bitplane struct

  207.  * We mainly need data and is_raw, so this struct could be avoided

  208.  * to save a level of indirection; feel free to modify

  209.  * @fixme For now, stride=width

  210.  * @warning Data are bits, either 1 or 0

  211.  */

  212. typedef struct BitPlane {

  213.     uint8_t *data;      ///< Data buffer

  214.     int width;          ///< Width of the buffer

  215.     int stride;         ///< Stride of the buffer

  216.     int height;         ///< Plane height

  217.     uint8_t is_raw;     ///< Bit values must be read at MB level

  218. } BitPlane;

  219. 

  220. 

  221. /** Block data for DC/AC prediction

  222. */

  223. typedef struct Block {

  224.     uint16_t dc;

  225.     int16_t hor_ac[7];

  226.     int16_t vert_ac[7];

  227.     int16_t dcstep, step;

  228. } Block;

  229. 

  230. /** The VC1 Context

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

  232.  * Many members are only used for Advanced Profile

  233.  */

  234. typedef struct VC1Context{

  235.     MpegEncContext s;

  236. 

  237.     int bits;

  238. 

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

  240.     //@{

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

  242.     int res_x8;           ///< reserved

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

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

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

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

  247.                           ///< at frame level

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

  249.     int reserved;         ///< reserved

  250.     //@}

  251. 

  252.     /** Advanced Profile */

  253.     //@{

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

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

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

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

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

  259.     int tfcntrflag;       ///< TFCNTR present

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

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

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

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

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

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

  266.                           ///< Decoder parameters

  267.     //@}

  268. 

  269.     /** Sequence header data for all Profiles

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

  271.      */

  272.     //@{

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

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

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

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

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

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

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

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

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

  282.     int finterpflag;      ///< INTERPFRM present

  283.     //@}

  284. 

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

  286.     //@{

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

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

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

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

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

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

  293.     /** pquant parameters */

  294.     //@{

  295.     uint8_t dquantfrm;

  296.     uint8_t dqprofile;

  297.     uint8_t dqsbedge;

  298.     uint8_t dqbilevel;

  299.     //@}

  300.     /** AC coding set indexes

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

  302.      */

  303.     //@{

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

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

  306.     //@}

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

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

  309.     int ttmb;             ///< Transform type

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

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

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

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

  314. 

  315. 

  316.     /** Luma compensation parameters */

  317.     //@{

  318.     uint8_t lumscale;

  319.     uint8_t lumshift;

  320.     //@}

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

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

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

  324.     int buffer_fullness;  ///< HRD info

  325.     /** Ranges:

  326.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  327.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  328.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  329.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  330.      */

  331.     uint8_t mvrange;

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

  333.     uint8_t *previous_line_cbpcy; ///< To use for predicted CBPCY

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

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

  336.     BitPlane mv_type_mb_plane;    ///< bitplane for mv_type == (4MV)

  337.     BitPlane skip_mb_plane;       ///< bitplane for skipped MBs

  338.     BitPlane direct_mb_plane;     ///< bitplane for "direct" MBs

  339. 

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

  341.     //@{

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

  343.     uint8_t interpfrm;

  344.     //@}

  345. 

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

  347.     //@{

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

  349.     uint8_t numpanscanwin;

  350.     uint8_t tfcntr;

  351.     uint8_t rptfrm, tff, rff;

  352.     uint16_t topleftx;

  353.     uint16_t toplefty;

  354.     uint16_t bottomrightx;

  355.     uint16_t bottomrighty;

  356.     uint8_t uvsamp;

  357.     uint8_t postproc;

  358.     int hrd_num_leaky_buckets;

  359.     uint8_t bit_rate_exponent;

  360.     uint8_t buffer_size_exponent;

  361.     BitPlane ac_pred_plane;       ///< AC prediction flags bitplane

  362.     BitPlane over_flags_plane;    ///< Overflags bitplane

  363.     uint8_t condover;

  364.     uint16_t *hrd_rate, *hrd_buffer;

  365.     uint8_t *hrd_fullness;

  366.     uint8_t range_mapy_flag;

  367.     uint8_t range_mapuv_flag;

  368.     uint8_t range_mapy;

  369.     uint8_t range_mapuv;

  370.     //@}

  371. } VC1Context;

  372. 

  373. /**

  374.  * Get unary code of limited length

  375.  * @fixme FIXME Slow and ugly

  376.  * @param gb GetBitContext

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

  378.  * @param[in] len Maximum length

  379.  * @return Unary length/index

  380.  */

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

  382. {

  383. #if 1

  384.     int i;

  385. 

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

  387.     return i;

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

  389. 

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

  391.   {

  392.     tmp = get_bits(gb, 1);

  393.     i++;

  394.   }

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

  396.   return i;*/

  397. #else

  398.   unsigned int buf;

  399.   int log;

  400. 

  401.   OPEN_READER(re, gb);

  402.   UPDATE_CACHE(re, gb);

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

  404.   if (stop) buf = ~buf;

  405. 

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

  407.   if (log < limit){

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

  409.     CLOSE_READER(re, gb);

  410.     return log;

  411.   }

  412. 

  413.   LAST_SKIP_BITS(re, gb, limit);

  414.   CLOSE_READER(re, gb);

  415.   return limit;

  416. #endif

  417. }

  418. 

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

  420.     int n;

  421.     n = get_bits1(gb);

  422.     if (n == 1)

  423.         return 0;

  424.     else

  425.         return 2 - get_bits1(gb);

  426. }

  427. 

  428. /**

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

  430.  * @param v The VC1Context to initialize

  431.  * @return Status

  432.  */

  433. static int vc1_init_common(VC1Context *v)

  434. {

  435.     static int done = 0;

  436.     int i = 0;

  437. 

  438.     /* Set the bit planes */

  439.     v->mv_type_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };

  440.     v->direct_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };

  441.     v->skip_mb_plane = (struct BitPlane) { NULL, 0, 0, 0 };

  442.     v->ac_pred_plane = v->over_flags_plane = (struct BitPlane) { NULL, 0, 0, 0 };

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

  444. 

  445.     /* VLC tables */

  446.     if(!done)

  447.     {

  448.         done = 1;

  449.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  450.                  vc1_bfraction_bits, 1, 1,

  451.                  vc1_bfraction_codes, 1, 1, 1);

  452.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  453.                  vc1_norm2_bits, 1, 1,

  454.                  vc1_norm2_codes, 1, 1, 1);

  455.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  456.                  vc1_norm6_bits, 1, 1,

  457.                  vc1_norm6_codes, 2, 2, 1);

  458.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  459.                  vc1_imode_bits, 1, 1,

  460.                  vc1_imode_codes, 1, 1, 1);

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

  462.         {

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

  464.                      vc1_ttmb_bits[i], 1, 1,

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

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

  467.                      vc1_ttblk_bits[i], 1, 1,

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

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

  470.                      vc1_subblkpat_bits[i], 1, 1,

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

  472.         }

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

  474.         {

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

  476.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  479.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  482.                      vc1_mv_diff_bits[i], 1, 1,

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

  484.         }

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

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

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

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

  489.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  492.     }

  493. 

  494.     /* Other defaults */

  495.     v->pq = -1;

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

  497. 

  498.     return 0;

  499. }

  500. 

  501. /***********************************************************************/

  502. /**

  503.  * @defgroup bitplane VC9 Bitplane decoding

  504.  * @see 8.7, p56

  505.  * @{

  506.  */

  507. 

  508. /** @addtogroup bitplane

  509.  * Imode types

  510.  * @{

  511.  */

  512. enum Imode {

  513.     IMODE_RAW,

  514.     IMODE_NORM2,

  515.     IMODE_DIFF2,

  516.     IMODE_NORM6,

  517.     IMODE_DIFF6,

  518.     IMODE_ROWSKIP,

  519.     IMODE_COLSKIP

  520. };

  521. /** @} */ //imode defines

  522. 

  523. /** Allocate the buffer from a bitplane, given its dimensions

  524.  * @param bp Bitplane which buffer is to allocate

  525.  * @param[in] width Width of the buffer

  526.  * @param[in] height Height of the buffer

  527.  * @return Status

  528.  * @todo TODO: Take into account stride

  529.  * @todo TODO: Allow use of external buffers ?

  530.  */

  531. static int alloc_bitplane(BitPlane *bp, int width, int height)

  532. {

  533.     if (!bp || bp->width<0 || bp->height<0) return -1;

  534.     bp->data = (uint8_t*)av_malloc(width*height);

  535.     if (!bp->data) return -1;

  536.     bp->width = bp->stride = width;

  537.     bp->height = height;

  538.     return 0;

  539. }

  540. 

  541. /** Free the bitplane's buffer

  542.  * @param bp Bitplane which buffer is to free

  543.  */

  544. static void free_bitplane(BitPlane *bp)

  545. {

  546.     bp->width = bp->stride = bp->height = 0;

  547.     if (bp->data) av_freep(&bp->data);

  548. }

  549. 

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

  551.  * @param plane Buffer to store decoded bits

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

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

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

  555.  */

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

  557.     int x, y;

  558. 

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

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

  561.             memset(plane, 0, width);

  562.         else

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

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

  565.         plane += stride;

  566.     }

  567. }

  568. 

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

  570.  * @param plane Buffer to store decoded bits

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

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

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

  574.  * @fixme FIXME: Optimize

  575.  */

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

  577.     int x, y;

  578. 

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

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

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

  582.                 plane[y*stride] = 0;

  583.         else

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

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

  586.         plane ++;

  587.     }

  588. }

  589. 

  590. /** Decode a bitplane's bits

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

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

  593.  * @return Status

  594.  * @fixme FIXME: Optimize

  595.  * @todo TODO: Decide if a struct is needed

  596.  */

  597. static int bitplane_decoding(BitPlane *bp, VC1Context *v)

  598. {

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

  600. 

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

  602.     uint8_t invert, *planep = bp->data;

  603. 

  604.     invert = get_bits(gb, 1);

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

  606. 

  607.     bp->is_raw = 0;

  608.     switch (imode)

  609.     {

  610.     case IMODE_RAW:

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

  612.         bp->is_raw = 1; //invert ignored

  613.         return invert;

  614.     case IMODE_DIFF2:

  615.     case IMODE_NORM2:

  616.         if ((bp->height * bp->width) & 1)

  617.         {

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

  619.             offset = 1;

  620.         }

  621.         else offset = 0;

  622.         // decode bitplane as one long line

  623.         for (y = offset; y < bp->height * bp->width; y += 2) {

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

  625.             *planep++ = code & 1;

  626.             offset++;

  627.             if(offset == bp->width) {

  628.                 offset = 0;

  629.                 planep += bp->stride - bp->width;

  630.             }

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

  632.             offset++;

  633.             if(offset == bp->width) {

  634.                 offset = 0;

  635.                 planep += bp->stride - bp->width;

  636.             }

  637.         }

  638.         break;

  639.     case IMODE_DIFF6:

  640.     case IMODE_NORM6:

  641.         if(!(bp->height % 3) && (bp->width % 3)) { // use 2x3 decoding

  642.             for(y = 0; y < bp->height; y+= 3) {

  643.                 for(x = bp->width & 1; x < bp->width; x += 2) {

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

  645.                     if(code < 0){

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

  647.                         return -1;

  648.                     }

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

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

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

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

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

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

  655.                 }

  656.                 planep += bp->stride * 3;

  657.             }

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

  659.         } else { // 3x2

  660.             for(y = bp->height & 1; y < bp->height; y += 2) {

  661.                 for(x = bp->width % 3; x < bp->width; x += 3) {

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

  663.                     if(code < 0){

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

  665.                         return -1;

  666.                     }

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

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

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

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

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

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

  673.                 }

  674.                 planep += bp->stride * 2;

  675.             }

  676.             x = bp->width % 3;

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

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

  679.         }

  680.         break;

  681.     case IMODE_ROWSKIP:

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

  683.         break;

  684.     case IMODE_COLSKIP:

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

  686.         break;

  687.     default: break;

  688.     }

  689. 

  690.     /* Applying diff operator */

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

  692.     {

  693.         planep = bp->data;

  694.         planep[0] ^= invert;

  695.         for (x=1; x<bp->width; x++)

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

  697.         for (y=1; y<bp->height; y++)

  698.         {

  699.             planep += bp->stride;

  700.             planep[0] ^= planep[-bp->stride];

  701.             for (x=1; x<bp->width; x++)

  702.             {

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

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

  705.             }

  706.         }

  707.     }

  708.     else if (invert)

  709.     {

  710.         planep = bp->data;

  711.         for (x=0; x<bp->width*bp->height; x++) planep[x] = !planep[x]; //FIXME stride

  712.     }

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

  714. }

  715. /** @} */ //Bitplane group

  716. 

  717. /***********************************************************************/

  718. /** VOP Dquant decoding

  719.  * @param v VC-1 Context

  720.  */

  721. static int vop_dquant_decoding(VC1Context *v)

  722. {

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

  724.     int pqdiff;

  725. 

  726.     //variable size

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

  728.     {

  729.         pqdiff = get_bits(gb, 3);

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

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

  732.     }

  733.     else

  734.     {

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

  736.         if ( v->dquantfrm )

  737.         {

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

  739.             switch (v->dqprofile)

  740.             {

  741.             case DQPROFILE_SINGLE_EDGE:

  742.             case DQPROFILE_DOUBLE_EDGES:

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

  744.                 break;

  745.             case DQPROFILE_ALL_MBS:

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

  747.             default: break; //Forbidden ?

  748.             }

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

  750.             {

  751.                 pqdiff = get_bits(gb, 3);

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

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

  754.             }

  755.         }

  756.     }

  757.     return 0;

  758. }

  759. 

  760. 

  761. /** Do inverse transform

  762.  */

  763. static void vc1_inv_trans(DCTELEM block[64], int M, int N)

  764. {

  765.     int i;

  766.     register int t1,t2,t3,t4,t5,t6,t7,t8;

  767.     DCTELEM *src, *dst;

  768. 

  769.     src = block;

  770.     dst = block;

  771.     if(M==4){

  772.         for(i = 0; i < N; i++){

  773.             t1 = 17 * (src[0] + src[2]);

  774.             t2 = 17 * (src[0] - src[2]);

  775.             t3 = 22 * src[1];

  776.             t4 = 22 * src[3];

  777.             t5 = 10 * src[1];

  778.             t6 = 10 * src[3];

  779. 

  780.             dst[0] = (t1 + t3 + t6 + 4) >> 3;

  781.             dst[1] = (t2 - t4 + t5 + 4) >> 3;

  782.             dst[2] = (t2 + t4 - t5 + 4) >> 3;

  783.             dst[3] = (t1 - t3 - t6 + 4) >> 3;

  784. 

  785.             src += 8;

  786.             dst += 8;

  787.         }

  788.     }else{

  789.         for(i = 0; i < N; i++){

  790.             t1 = 12 * (src[0] + src[4]);

  791.             t2 = 12 * (src[0] - src[4]);

  792.             t3 = 16 * src[2] +  6 * src[6];

  793.             t4 =  6 * src[2] - 16 * src[6];

  794. 

  795.             t5 = t1 + t3;

  796.             t6 = t2 + t4;

  797.             t7 = t2 - t4;

  798.             t8 = t1 - t3;

  799. 

  800.             t1 = 16 * src[1] + 15 * src[3] +  9 * src[5] +  4 * src[7];

  801.             t2 = 15 * src[1] -  4 * src[3] - 16 * src[5] -  9 * src[7];

  802.             t3 =  9 * src[1] - 16 * src[3] +  4 * src[5] + 15 * src[7];

  803.             t4 =  4 * src[1] -  9 * src[3] + 15 * src[5] - 16 * src[7];

  804. 

  805.             dst[0] = (t5 + t1 + 4) >> 3;

  806.             dst[1] = (t6 + t2 + 4) >> 3;

  807.             dst[2] = (t7 + t3 + 4) >> 3;

  808.             dst[3] = (t8 + t4 + 4) >> 3;

  809.             dst[4] = (t8 - t4 + 4) >> 3;

  810.             dst[5] = (t7 - t3 + 4) >> 3;

  811.             dst[6] = (t6 - t2 + 4) >> 3;

  812.             dst[7] = (t5 - t1 + 4) >> 3;

  813. 

  814.             src += 8;

  815.             dst += 8;

  816.         }

  817.     }

  818. 

  819.     src = block;

  820.     dst = block;

  821.     if(N==4){

  822.         for(i = 0; i < M; i++){

  823.             t1 = 17 * (src[ 0] + src[16]);

  824.             t2 = 17 * (src[ 0] - src[16]);

  825.             t3 = 22 * src[ 8];

  826.             t4 = 22 * src[24];

  827.             t5 = 10 * src[ 8];

  828.             t6 = 10 * src[24];

  829. 

  830.             dst[ 0] = (t1 + t3 + t6 + 64) >> 7;

  831.             dst[ 8] = (t2 - t4 + t5 + 64) >> 7;

  832.             dst[16] = (t2 + t4 - t5 + 64) >> 7;

  833.             dst[24] = (t1 - t3 - t6 + 64) >> 7;

  834. 

  835.             src ++;

  836.             dst ++;

  837.         }

  838.     }else{

  839.         for(i = 0; i < M; i++){

  840.             t1 = 12 * (src[ 0] + src[32]);

  841.             t2 = 12 * (src[ 0] - src[32]);

  842.             t3 = 16 * src[16] +  6 * src[48];

  843.             t4 =  6 * src[16] - 16 * src[48];

  844. 

  845.             t5 = t1 + t3;

  846.             t6 = t2 + t4;

  847.             t7 = t2 - t4;

  848.             t8 = t1 - t3;

  849. 

  850.             t1 = 16 * src[ 8] + 15 * src[24] +  9 * src[40] +  4 * src[56];

  851.             t2 = 15 * src[ 8] -  4 * src[24] - 16 * src[40] -  9 * src[56];

  852.             t3 =  9 * src[ 8] - 16 * src[24] +  4 * src[40] + 15 * src[56];

  853.             t4 =  4 * src[ 8] -  9 * src[24] + 15 * src[40] - 16 * src[56];

  854. 

  855.             dst[ 0] = (t5 + t1 + 64) >> 7;

  856.             dst[ 8] = (t6 + t2 + 64) >> 7;

  857.             dst[16] = (t7 + t3 + 64) >> 7;

  858.             dst[24] = (t8 + t4 + 64) >> 7;

  859.             dst[32] = (t8 - t4 + 64 + 1) >> 7;

  860.             dst[40] = (t7 - t3 + 64 + 1) >> 7;

  861.             dst[48] = (t6 - t2 + 64 + 1) >> 7;

  862.             dst[56] = (t5 - t1 + 64 + 1) >> 7;

  863. 

  864.             src++;

  865.             dst++;

  866.         }

  867.     }

  868. }

  869. 

  870. /** Apply overlap transform

  871.  * @todo optimize

  872.  * @todo move to DSPContext

  873.  */

  874. static void vc1_overlap_block(MpegEncContext *s, DCTELEM block[64], int n, int do_hor, int do_vert)

  875. {

  876.     int i;

  877. 

  878.     if(do_hor) { //TODO

  879.     }

  880.     if(do_vert) { //TODO

  881.     }

  882. 

  883.     for(i = 0; i < 64; i++)

  884.         block[i] += 128;

  885. }

  886. 

  887. 

  888. /** Put block onto picture

  889.  * @todo move to DSPContext

  890.  */

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

  892. {

  893.     uint8_t *Y;

  894.     int ys, us, vs;

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

  896. 

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

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

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

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

  901. 

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

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

  904.     Y += ys * 8;

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

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

  907. 

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

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

  910. }

  911. 

  912. /** Do motion compensation over 1 macroblock

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

  914.  */

  915. static void vc1_mc_1mv(VC1Context *v)

  916. {

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

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

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

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

  921.     int width = s->mb_width * 16, height = s->mb_height * 16;

  922. 

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

  924. 

  925.     mx = s->mv[0][0][0] >> s->mspel;

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

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

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

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

  930. 

  931.     if(s->mspel) { // hpel mc

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

  933.         src_x = s->mb_x * 16 + (mx >> 1);

  934.         src_y = s->mb_y * 16 + (my >> 1);

  935. /*        src_x = clip(src_x, -16, width); //FIXME unneeded for emu?

  936.         if (src_x == width)

  937.             dxy &= ~1;

  938.         src_y = clip(src_y, -16, height);

  939.         if (src_y == height)

  940.             dxy &= ~2;*/

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

  942.         srcU += (src_y >> 1) * s->uvlinesize + (src_x >> 1);

  943.         srcV += (src_y >> 1) * s->uvlinesize + (src_x >> 1);

  944. 

  945.         if((unsigned)src_x > s->h_edge_pos - (mx&1) - 16

  946.            || (unsigned)src_y > s->v_edge_pos - (my&1) - 16){

  947.             uint8_t *uvbuf= s->edge_emu_buffer + 18 * s->linesize;

  948. 

  949.             ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 16+1, 16+1,

  950.                              src_x, src_y, s->h_edge_pos, s->v_edge_pos);

  951.             srcY = s->edge_emu_buffer;

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

  953.                              src_x >> 1, src_y >> 1, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

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

  955.                              src_x >> 1, src_y >> 1, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  956.             srcU = uvbuf;

  957.             srcV = uvbuf + 16;

  958.         }

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

  960.         dsp->put_no_rnd_pixels_tab[1][0](s->dest[1], srcU, s->uvlinesize, 8);

  961.         dsp->put_no_rnd_pixels_tab[1][0](s->dest[2], srcV, s->uvlinesize, 8);

  962.     } else {

  963.         int motion_x = mx, motion_y = my, uvdxy, uvsrc_x, uvsrc_y;

  964.         dxy = ((motion_y & 3) << 2) | (motion_x & 3);

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

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

  967. 

  968.         mx= motion_x/2;

  969.         my= motion_y/2;

  970. 

  971.         mx= (mx>>1)|(mx&1);

  972.         my= (my>>1)|(my&1);

  973. 

  974.         uvdxy= (mx&1) | ((my&1)<<1);

  975.         mx>>=1;

  976.         my>>=1;

  977. 

  978.         uvsrc_x = s->mb_x * 8 + mx;

  979.         uvsrc_y = s->mb_y * 8 + my;

  980. 

  981.         srcY = s->last_picture.data[0] +   src_y *   s->linesize +   src_x;

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

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

  984. 

  985.         if(   (unsigned)src_x > s->h_edge_pos - (motion_x&3) - 16

  986.               || (unsigned)src_y > s->v_edge_pos - (motion_y&3) - 16  ){

  987.             uint8_t *uvbuf= s->edge_emu_buffer + 18*s->linesize;

  988.             ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17, 17,

  989.                                 src_x, src_y, s->h_edge_pos, s->v_edge_pos);

  990.             srcY = s->edge_emu_buffer;

  991.             ff_emulated_edge_mc(uvbuf, srcU, s->uvlinesize, 9, 9,

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

  993.             ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 9, 9,

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

  995.             srcU = uvbuf;

  996.             srcV = uvbuf + 16;

  997.         }

  998. 

  999.         dsp->put_no_rnd_qpel_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize);

  1000.         dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize, 8);

  1001.         dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);

  1002.     }

  1003. }

  1004. 

  1005. /**

  1006.  * Decode Simple/Main Profiles sequence header

  1007.  * @see Figure 7-8, p16-17

  1008.  * @param avctx Codec context

  1009.  * @param gb GetBit context initialized from Codec context extra_data

  1010.  * @return Status

  1011.  */

  1012. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1013. {

  1014.     VC1Context *v = avctx->priv_data;

  1015. 

  1016.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1017.     v->profile = get_bits(gb, 2);

  1018.     if (v->profile == 2)

  1019.     {

  1020.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1021.         return -1;

  1022.     }

  1023. 

  1024.     if (v->profile == PROFILE_ADVANCED)

  1025.     {

  1026.         v->level = get_bits(gb, 3);

  1027.         if(v->level >= 5)

  1028.         {

  1029.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1030.         }

  1031.         v->chromaformat = get_bits(gb, 2);

  1032.         if (v->chromaformat != 1)

  1033.         {

  1034.             av_log(avctx, AV_LOG_ERROR,

  1035.                    "Only 4:2:0 chroma format supported\n");

  1036.             return -1;

  1037.         }

  1038.     }

  1039.     else

  1040.     {

  1041.         v->res_sm = get_bits(gb, 2); //reserved

  1042.         if (v->res_sm)

  1043.         {

  1044.             av_log(avctx, AV_LOG_ERROR,

  1045.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1046.             return -1;

  1047.         }

  1048.     }

  1049. 

  1050.     // (fps-2)/4 (->30)

  1051.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1052.     // (bitrate-32kbps)/64kbps

  1053.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1054.     v->s.loop_filter = get_bits(gb, 1); //common

  1055.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1056.     {

  1057.         av_log(avctx, AV_LOG_ERROR,

  1058.                "LOOPFILTER shell not be enabled in simple profile\n");

  1059.     }

  1060. 

  1061.     if (v->profile < PROFILE_ADVANCED)

  1062.     {

  1063.         v->res_x8 = get_bits(gb, 1); //reserved

  1064.         if (v->res_x8)

  1065.         {

  1066.             av_log(avctx, AV_LOG_ERROR,

  1067.                    "1 for reserved RES_X8 is forbidden\n");

  1068.             //return -1;

  1069.         }

  1070.         v->multires = get_bits(gb, 1);

  1071.         v->res_fasttx = get_bits(gb, 1);

  1072.         if (!v->res_fasttx)

  1073.         {

  1074.             av_log(avctx, AV_LOG_ERROR,

  1075.                    "0 for reserved RES_FASTTX is forbidden\n");

  1076.             //return -1;

  1077.         }

  1078.     }

  1079. 

  1080.     v->fastuvmc =  get_bits(gb, 1); //common

  1081.     if (!v->profile && !v->fastuvmc)

  1082.     {

  1083.         av_log(avctx, AV_LOG_ERROR,

  1084.                "FASTUVMC unavailable in Simple Profile\n");

  1085.         return -1;

  1086.     }

  1087.     v->extended_mv =  get_bits(gb, 1); //common

  1088.     if (!v->profile && v->extended_mv)

  1089.     {

  1090.         av_log(avctx, AV_LOG_ERROR,

  1091.                "Extended MVs unavailable in Simple Profile\n");

  1092.         return -1;

  1093.     }

  1094.     v->dquant =  get_bits(gb, 2); //common

  1095.     v->vstransform =  get_bits(gb, 1); //common

  1096. 

  1097.     if (v->profile < PROFILE_ADVANCED)

  1098.     {

  1099.         v->res_transtab = get_bits(gb, 1);

  1100.         if (v->res_transtab)

  1101.         {

  1102.             av_log(avctx, AV_LOG_ERROR,

  1103.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1104.             return -1;

  1105.         }

  1106.     }

  1107. 

  1108.     v->overlap = get_bits(gb, 1); //common

  1109. 

  1110.     if (v->profile < PROFILE_ADVANCED)

  1111.     {

  1112.         v->s.resync_marker = get_bits(gb, 1);

  1113.         v->rangered = get_bits(gb, 1);

  1114.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1115.         {

  1116.             av_log(avctx, AV_LOG_INFO,

  1117.                    "RANGERED should be set to 0 in simple profile\n");

  1118.         }

  1119.     }

  1120. 

  1121.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1122.     v->quantizer_mode = get_bits(gb, 2); //common

  1123. 

  1124.     if (v->profile < PROFILE_ADVANCED)

  1125.     {

  1126.         v->finterpflag = get_bits(gb, 1); //common

  1127.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1128.         if (!v->res_rtm_flag)

  1129.         {

  1130.             av_log(avctx, AV_LOG_ERROR,

  1131.                    "0 for reserved RES_RTM_FLAG is forbidden\n");

  1132.             //return -1;

  1133.         }

  1134.         av_log(avctx, AV_LOG_DEBUG,

  1135.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1136.                "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"

  1137.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1138.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1139.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1140.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1141.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1142.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1143.                );

  1144.         return 0;

  1145.     }

  1146.     return -1;

  1147. }

  1148. 

  1149. 

  1150. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1151. {

  1152.     int pqindex, lowquant, status;

  1153. 

  1154.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1155.     skip_bits(gb, 2); //framecnt unused

  1156.     v->rangeredfrm = 0;

  1157.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1158.     v->s.pict_type = get_bits(gb, 1);

  1159.     if (v->s.avctx->max_b_frames) {

  1160.         if (!v->s.pict_type) {

  1161.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1162.             else v->s.pict_type = B_TYPE;

  1163.         } else v->s.pict_type = P_TYPE;

  1164.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1165. 

  1166.     if(v->s.pict_type == I_TYPE)

  1167.         get_bits(gb, 7); // skip buffer fullness

  1168. 

  1169.     /* Quantizer stuff */

  1170.     pqindex = get_bits(gb, 5);

  1171.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1172.         v->pq = pquant_table[0][pqindex];

  1173.     else

  1174.         v->pq = pquant_table[v->quantizer_mode-1][pqindex];

  1175. 

  1176.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1177.         v->pquantizer = pqindex < 9;

  1178.     if (v->quantizer_mode == QUANT_UNIFORM || v->quantizer_mode == QUANT_NON_UNIFORM)

  1179.         v->pquantizer = v->quantizer_mode == QUANT_UNIFORM;

  1180.     v->pqindex = pqindex;

  1181.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1182.     else v->halfpq = 0;

  1183.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1184.         v->pquantizer = get_bits(gb, 1);

  1185.     v->dquantfrm = 0;

  1186. 

  1187. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1188. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1189. 

  1190.     //TODO: complete parsing for P/B/BI frames

  1191.     switch(v->s.pict_type) {

  1192.     case P_TYPE:

  1193.         if (v->pq < 5) v->tt_index = 0;

  1194.         else if(v->pq < 13) v->tt_index = 1;

  1195.         else v->tt_index = 2;

  1196. 

  1197.         if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1198.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1199.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1200.         v->range_x = 1 << (v->k_x - 1);

  1201.         v->range_y = 1 << (v->k_y - 1);

  1202.         if (v->profile == PROFILE_ADVANCED)

  1203.         {

  1204.             if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1205.         }

  1206.         else

  1207.             if (v->multires) v->respic = get_bits(gb, 2);

  1208.         lowquant = (v->pq > 12) ? 0 : 1;

  1209.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1210.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1211.         {

  1212.             v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];

  1213.             v->lumscale = get_bits(gb, 6);

  1214.             v->lumshift = get_bits(gb, 6);

  1215.         }

  1216.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1217.             v->s.mspel = 1;

  1218.         else

  1219.             v->s.mspel = 0;

  1220. 

  1221. if(v->mv_mode != MV_PMODE_1MV && v->mv_mode != MV_PMODE_1MV_HPEL && v->mv_mode != MV_PMODE_1MV_HPEL_BILIN) {

  1222.     av_log(v->s.avctx, AV_LOG_ERROR, "Only 1MV P-frames are supported by now\n");

  1223.     return -1;

  1224. }

  1225.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1226.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1227.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1228.         {

  1229.             status = bitplane_decoding(&v->mv_type_mb_plane, v);

  1230.             if (status < 0) return -1;

  1231.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1232.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1233.         }

  1234.         status = bitplane_decoding(&v->skip_mb_plane, v);

  1235.         if (status < 0) return -1;

  1236.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1237.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1238. 

  1239.         /* Hopefully this is correct for P frames */

  1240.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1241.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1242. 

  1243.         if (v->dquant)

  1244.         {

  1245.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1246.             vop_dquant_decoding(v);

  1247.         }

  1248. 

  1249.         v->ttfrm = 0; //FIXME Is that so ?

  1250.         if (v->vstransform)

  1251.         {

  1252.             v->ttmbf = get_bits(gb, 1);

  1253.             if (v->ttmbf)

  1254.             {

  1255.                 v->ttfrm = get_bits(gb, 2);

  1256.             }

  1257.         }

  1258.         break;

  1259.     case B_TYPE:

  1260.         break;

  1261.     }

  1262. 

  1263.     /* AC Syntax */

  1264.     v->c_ac_table_index = decode012(gb);

  1265.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1266.     {

  1267.         v->y_ac_table_index = decode012(gb);

  1268.     }

  1269.     /* DC Syntax */

  1270.     v->s.dc_table_index = get_bits(gb, 1);

  1271. 

  1272.     return 0;

  1273. }

  1274. 

  1275. /***********************************************************************/

  1276. /**

  1277.  * @defgroup block VC-1 Block-level functions

  1278.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1279.  * @todo TODO: Integrate to MpegEncContext facilities

  1280.  * @{

  1281.  */

  1282. 

  1283. /**

  1284.  * @def GET_MQUANT

  1285.  * @brief Get macroblock-level quantizer scale

  1286.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1287.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1288.  */

  1289. #define GET_MQUANT()                                           \

  1290.   if (v->dquantfrm)                                            \

  1291.   {                                                            \

  1292.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1293.     {                                                          \

  1294.       if (v->dqbilevel)                                        \

  1295.       {                                                        \

  1296.         mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \

  1297.       }                                                        \

  1298.       else                                                     \

  1299.       {                                                        \

  1300.         mqdiff = get_bits(gb, 3);                              \

  1301.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1302.         else mquant = get_bits(gb, 5);                         \

  1303.       }                                                        \

  1304.     }                                                          \

  1305.     else mquant = v->pq;                                       \

  1306.   }

  1307. 

  1308. /**

  1309.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1310.  * @brief Get MV differentials

  1311.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1312.  * @param _dmv_x Horizontal differential for decoded MV

  1313.  * @param _dmv_y Vertical differential for decoded MV

  1314.  * @todo TODO: Use MpegEncContext arrays to store them

  1315.  */

  1316. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1317.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1318.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1319.   if (index > 36)                                                   \

  1320.   {                                                                 \

  1321.     mb_has_coeffs = 1;                                              \

  1322.     index -= 37;                                                    \

  1323.   }                                                                 \

  1324.   else mb_has_coeffs = 0;                                           \

  1325.   s->mb_intra = 0;                                                  \

  1326.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1327.   else if (index == 35)                                             \

  1328.   {                                                                 \

  1329.     _dmv_x = get_bits(gb, v->k_x - s->mspel);                       \

  1330.     _dmv_y = get_bits(gb, v->k_y - s->mspel);                       \

  1331.   }                                                                 \

  1332.   else if (index == 36)                                             \

  1333.   {                                                                 \

  1334.     _dmv_x = 0;                                                     \

  1335.     _dmv_y = 0;                                                     \

  1336.     s->mb_intra = 1;                                                \

  1337.   }                                                                 \

  1338.   else                                                              \

  1339.   {                                                                 \

  1340.     index1 = index%6;                                               \

  1341.     if (s->mspel && index1 == 5) val = 1;                           \

  1342.     else                         val = 0;                           \

  1343.     val = get_bits(gb, size_table[index1] - val);                   \

  1344.     sign = 0 - (val&1);                                             \

  1345.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1346.                                                                     \

  1347.     index1 = index/6;                                               \

  1348.     if (s->mspel && index1 == 5) val = 1;                           \

  1349.     else                          val = 0;                          \

  1350.     val = get_bits(gb, size_table[index1] - val);                   \

  1351.     sign = 0 - (val&1);                                             \

  1352.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1353.   }

  1354. 

  1355. /** Predict and set motion vector

  1356.  */

  1357. static inline void vc1_pred_mv(MpegEncContext *s, int dmv_x, int dmv_y, int mv1, int r_x, int r_y)

  1358. {

  1359.     int xy, wrap, off;

  1360.     int16_t *A, *B, *C;

  1361.     int px, py;

  1362.     int sum;

  1363.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1364. 

  1365.     /* scale MV difference to be quad-pel */

  1366.     dmv_x <<= s->mspel;

  1367.     dmv_y <<= s->mspel;

  1368. 

  1369.     wrap = s->b8_stride;

  1370.     xy = s->block_index[0];

  1371. 

  1372.     C = s->current_picture.motion_val[0][xy - (1 << mv1)];

  1373.     A = s->current_picture.motion_val[0][xy - (wrap << mv1)];

  1374.     off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1375.     B = s->current_picture.motion_val[0][xy + ((off - wrap) << mv1)];

  1376. 

  1377.     if(!s->first_slice_line) { // predictor A is not out of bounds

  1378.         if(s->mb_width == 1) {

  1379.             px = A[0];

  1380.             py = A[1];

  1381.         } else {

  1382.             px = mid_pred(A[0], B[0], C[0]);

  1383.             py = mid_pred(A[1], B[1], C[1]);

  1384.         }

  1385.     } else if(s->mb_x) { // predictor C is not out of bounds

  1386.         px = C[0];

  1387.         py = C[1];

  1388.     } else {

  1389.         px = py = 0;

  1390.     }

  1391.     if(s->mb_intra) px = py = 0;

  1392. 

  1393.     /* Pullback MV as specified in 8.3.5.3.4 */

  1394.     {

  1395.         int qx, qy, X, Y;

  1396.         qx = s->mb_x << 6; //FIXME: add real block coords for 4MV mode

  1397.         qy = s->mb_y << 6;

  1398.         X = (s->mb_width << 6) - 4;

  1399.         Y = (s->mb_height << 6) - 4;

  1400.         if(mv1) {

  1401.             if(qx + px < -60) px = -60 - qx;

  1402.             if(qy + py < -60) py = -60 - qy;

  1403.         } else {

  1404.             if(qx + px < -28) px = -28 - qx;

  1405.             if(qy + py < -28) py = -28 - qy;

  1406.         }

  1407.         if(qx + px > X) px = X - qx;

  1408.         if(qy + py > Y) py = Y - qy;

  1409.     }

  1410.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1411.     if(!s->mb_intra && !s->first_slice_line && s->mb_x) {

  1412.         if(IS_INTRA(s->current_picture.mb_type[mb_pos - s->mb_stride]))

  1413.             sum = ABS(px) + ABS(py);

  1414.         else

  1415.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1416.         if(sum > 32) {

  1417.             if(get_bits1(&s->gb)) {

  1418.                 px = A[0];

  1419.                 py = A[1];

  1420.             } else {

  1421.                 px = C[0];

  1422.                 py = C[1];

  1423.             }

  1424.         } else {

  1425.             if(IS_INTRA(s->current_picture.mb_type[mb_pos - 1]))

  1426.                 sum = ABS(px) + ABS(py);

  1427.             else

  1428.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1429.             if(sum > 32) {

  1430.                 if(get_bits1(&s->gb)) {

  1431.                     px = A[0];

  1432.                     py = A[1];

  1433.                 } else {

  1434.                     px = C[0];

  1435.                     py = C[1];

  1436.                 }

  1437.             }

  1438.         }

  1439.     }

  1440.     /* store MV using signed modulus of MV range defined in 4.11 */

  1441.     s->mv[0][0][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1442.     s->mv[0][0][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1443. }

  1444. 

  1445. /** Get predicted DC value for I-frames only

  1446.  * prediction dir: left=0, top=1

  1447.  * @param s MpegEncContext

  1448.  * @param[in] n block index in the current MB

  1449.  * @param dc_val_ptr Pointer to DC predictor

  1450.  * @param dir_ptr Prediction direction for use in AC prediction

  1451.  */

  1452. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1453.                               int16_t **dc_val_ptr, int *dir_ptr)

  1454. {

  1455.     int a, b, c, wrap, pred, scale;

  1456.     int16_t *dc_val;

  1457.     static const uint16_t dcpred[32] = {

  1458.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1459.          114,  102,   93,   85,   79,   73,   68,   64,

  1460.           60,   57,   54,   51,   49,   47,   45,   43,

  1461.           41,   39,   38,   37,   35,   34,   33

  1462.     };

  1463. 

  1464.     /* find prediction - wmv3_dc_scale always used here in fact */

  1465.     if (n < 4)     scale = s->y_dc_scale;

  1466.     else           scale = s->c_dc_scale;

  1467. 

  1468.     wrap = s->block_wrap[n];

  1469.     dc_val= s->dc_val[0] + s->block_index[n];

  1470. 

  1471.     /* B A

  1472.      * C X

  1473.      */

  1474.     c = dc_val[ - 1];

  1475.     b = dc_val[ - 1 - wrap];

  1476.     a = dc_val[ - wrap];

  1477. 

  1478.     if (pq < 9 || !overlap)

  1479.     {

  1480.         /* Set outer values */

  1481.         if (!s->mb_y && (n!=2 && n!=3)) b=a=dcpred[scale];

  1482.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1483.     }

  1484.     else

  1485.     {

  1486.         /* Set outer values */

  1487.         if (!s->mb_y && (n!=2 && n!=3)) b=a=0;

  1488.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1489.     }

  1490. 

  1491.     if (abs(a - b) <= abs(b - c)) {

  1492.         pred = c;

  1493.         *dir_ptr = 1;//left

  1494.     } else {

  1495.         pred = a;

  1496.         *dir_ptr = 0;//top

  1497.     }

  1498. 

  1499.     /* update predictor */

  1500.     *dc_val_ptr = &dc_val[0];

  1501.     return pred;

  1502. }

  1503. 

  1504. 

  1505. /** Get predicted DC value

  1506.  * prediction dir: left=0, top=1

  1507.  * @param s MpegEncContext

  1508.  * @param[in] n block index in the current MB

  1509.  * @param dc_val_ptr Pointer to DC predictor

  1510.  * @param dir_ptr Prediction direction for use in AC prediction

  1511.  */

  1512. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1513.                               int a_avail, int c_avail,

  1514.                               int16_t **dc_val_ptr, int *dir_ptr)

  1515. {

  1516.     int a, b, c, wrap, pred, scale;

  1517.     int16_t *dc_val;

  1518.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1519.     int mb_pos2, q1, q2;

  1520. 

  1521.     /* find prediction - wmv3_dc_scale always used here in fact */

  1522.     if (n < 4)     scale = s->y_dc_scale;

  1523.     else           scale = s->c_dc_scale;

  1524. 

  1525.     wrap = s->block_wrap[n];

  1526.     dc_val= s->dc_val[0] + s->block_index[n];

  1527. 

  1528.     /* B A

  1529.      * C X

  1530.      */

  1531.     c = dc_val[ - 1];

  1532.     b = dc_val[ - 1 - wrap];

  1533.     a = dc_val[ - wrap];

  1534. 

  1535.     if(a_avail && c_avail) {

  1536.         if(abs(a - b) <= abs(b - c)) {

  1537.             pred = c;

  1538.             *dir_ptr = 1;//left

  1539.         } else {

  1540.             pred = a;

  1541.             *dir_ptr = 0;//top

  1542.         }

  1543.     } else if(a_avail) {

  1544.         pred = a;

  1545.         *dir_ptr = 0;//top

  1546.     } else if(c_avail) {

  1547.         pred = c;

  1548.         *dir_ptr = 1;//left

  1549.     } else {

  1550.         pred = 0;

  1551.         *dir_ptr = 1;//left

  1552.     }

  1553. 

  1554.     /* scale coeffs if needed */

  1555.     mb_pos2 = mb_pos - *dir_ptr - (1 - *dir_ptr) * s->mb_stride;

  1556.     q1 = s->current_picture.qscale_table[mb_pos];

  1557.     q2 = s->current_picture.qscale_table[mb_pos2];

  1558.     if(0 && q1 && q2 && q1 != q2) {

  1559.         q1 = s->y_dc_scale_table[q1];

  1560.         q2 = s->y_dc_scale_table[q2];

  1561.         pred = (pred * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1562.     }

  1563. 

  1564.     /* update predictor */

  1565.     *dc_val_ptr = &dc_val[0];

  1566.     return pred;

  1567. }

  1568. 

  1569. 

  1570. /**

  1571.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1572.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1573.  * @todo TODO: Integrate to MpegEncContext facilities

  1574.  * @{

  1575.  */

  1576. 

  1577. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1578. {

  1579.     int xy, wrap, pred, a, b, c;

  1580. 

  1581.     xy = s->block_index[n];

  1582.     wrap = s->b8_stride;

  1583. 

  1584.     /* B C

  1585.      * A X

  1586.      */

  1587.     a = s->coded_block[xy - 1       ];

  1588.     b = s->coded_block[xy - 1 - wrap];

  1589.     c = s->coded_block[xy     - wrap];

  1590. 

  1591.     if (b == c) {

  1592.         pred = a;

  1593.     } else {

  1594.         pred = c;

  1595.     }

  1596. 

  1597.     /* store value */

  1598.     *coded_block_ptr = &s->coded_block[xy];

  1599. 

  1600.     return pred;

  1601. }

  1602. 

  1603. /**

  1604.  * Decode one AC coefficient

  1605.  * @param v The VC1 context

  1606.  * @param last Last coefficient

  1607.  * @param skip How much zero coefficients to skip

  1608.  * @param value Decoded AC coefficient value

  1609.  * @see 8.1.3.4

  1610.  */

  1611. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1612. {

  1613.     GetBitContext *gb = &v->s.gb;

  1614.     int index, escape, run = 0, level = 0, lst = 0;

  1615. 

  1616.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1617.     if (index != vc1_ac_sizes[codingset] - 1) {

  1618.         run = vc1_index_decode_table[codingset][index][0];

  1619.         level = vc1_index_decode_table[codingset][index][1];

  1620.         lst = index >= vc1_last_decode_table[codingset];

  1621.         if(get_bits(gb, 1))

  1622.             level = -level;

  1623.     } else {

  1624.         escape = decode210(gb);

  1625.         if (escape == 0) {

  1626.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1627.             run = vc1_index_decode_table[codingset][index][0];

  1628.             level = vc1_index_decode_table[codingset][index][1];

  1629.             lst = index >= vc1_last_decode_table[codingset];

  1630.             if(lst)

  1631.                 level += vc1_last_delta_level_table[codingset][run];

  1632.             else

  1633.                 level += vc1_delta_level_table[codingset][run];

  1634.             if(get_bits(gb, 1))

  1635.                 level = -level;

  1636.         } else if (escape == 1) {

  1637.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1638.             run = vc1_index_decode_table[codingset][index][0];

  1639.             level = vc1_index_decode_table[codingset][index][1];

  1640.             lst = index >= vc1_last_decode_table[codingset];

  1641.             if(lst)

  1642.                 run += vc1_last_delta_run_table[codingset][level] + 1;

  1643.             else

  1644.                 run += vc1_delta_run_table[codingset][level] + 1;

  1645.             if(get_bits(gb, 1))

  1646.                 level = -level;

  1647.         } else {

  1648.             int sign;

  1649.             lst = get_bits(gb, 1);

  1650.             if(v->s.esc3_level_length == 0) {

  1651.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1652.                     v->s.esc3_level_length = get_bits(gb, 3);

  1653.                     if(!v->s.esc3_level_length)

  1654.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1655.                 } else { //table 60

  1656.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1657.                 }

  1658.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1659.             }

  1660.             run = get_bits(gb, v->s.esc3_run_length);

  1661.             sign = get_bits(gb, 1);

  1662.             level = get_bits(gb, v->s.esc3_level_length);

  1663.             if(sign)

  1664.                 level = -level;

  1665.         }

  1666.     }

  1667. 

  1668.     *last = lst;

  1669.     *skip = run;

  1670.     *value = level;

  1671. }

  1672. 

  1673. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1674.  * @param v VC1Context

  1675.  * @param block block to decode

  1676.  * @param coded are AC coeffs present or not

  1677.  * @param codingset set of VLC to decode data

  1678.  */

  1679. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1680. {

  1681.     GetBitContext *gb = &v->s.gb;

  1682.     MpegEncContext *s = &v->s;

  1683.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1684.     int run_diff, i;

  1685.     int16_t *dc_val;

  1686.     int16_t *ac_val, *ac_val2;

  1687.     int dcdiff;

  1688. 

  1689.     /* Get DC differential */

  1690.     if (n < 4) {

  1691.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1692.     } else {

  1693.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1694.     }

  1695.     if (dcdiff < 0){

  1696.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1697.         return -1;

  1698.     }

  1699.     if (dcdiff)

  1700.     {

  1701.         if (dcdiff == 119 /* ESC index value */)

  1702.         {

  1703.             /* TODO: Optimize */

  1704.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1705.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1706.             else dcdiff = get_bits(gb, 8);

  1707.         }

  1708.         else

  1709.         {

  1710.             if (v->pq == 1)

  1711.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1712.             else if (v->pq == 2)

  1713.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1714.         }

  1715.         if (get_bits(gb, 1))

  1716.             dcdiff = -dcdiff;

  1717.     }

  1718. 

  1719.     /* Prediction */

  1720.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1721.     *dc_val = dcdiff;

  1722. 

  1723.     /* Store the quantized DC coeff, used for prediction */

  1724. 

  1725.     if (n < 4) {

  1726.         block[0] = dcdiff * s->y_dc_scale;

  1727.     } else {

  1728.         block[0] = dcdiff * s->c_dc_scale;

  1729.     }

  1730.     /* Skip ? */

  1731.     run_diff = 0;

  1732.     i = 0;

  1733.     if (!coded) {

  1734.         goto not_coded;

  1735.     }

  1736. 

  1737.     //AC Decoding

  1738.     i = 1;

  1739. 

  1740.     {

  1741.         int last = 0, skip, value;

  1742.         const int8_t *zz_table;

  1743.         int scale;

  1744.         int k;

  1745. 

  1746.         scale = v->pq * 2 + v->halfpq;

  1747. 

  1748.         if(v->s.ac_pred) {

  1749.             if(!dc_pred_dir)

  1750.                 zz_table = vc1_horizontal_zz;

  1751.             else

  1752.                 zz_table = vc1_vertical_zz;

  1753.         } else

  1754.             zz_table = vc1_normal_zz;

  1755. 

  1756.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1757.         ac_val2 = ac_val;

  1758.         if(dc_pred_dir) //left

  1759.             ac_val -= 16;

  1760.         else //top

  1761.             ac_val -= 16 * s->block_wrap[n];

  1762. 

  1763.         while (!last) {

  1764.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1765.             i += skip;

  1766.             if(i > 63)

  1767.                 break;

  1768.             block[zz_table[i++]] = value;

  1769.         }

  1770. 

  1771.         /* apply AC prediction if needed */

  1772.         if(s->ac_pred) {

  1773.             if(dc_pred_dir) { //left

  1774.                 for(k = 1; k < 8; k++)

  1775.                     block[k << 3] += ac_val[k];

  1776.             } else { //top

  1777.                 for(k = 1; k < 8; k++)

  1778.                     block[k] += ac_val[k + 8];

  1779.             }

  1780.         }

  1781.         /* save AC coeffs for further prediction */

  1782.         for(k = 1; k < 8; k++) {

  1783.             ac_val2[k] = block[k << 3];

  1784.             ac_val2[k + 8] = block[k];

  1785.         }

  1786. 

  1787.         /* scale AC coeffs */

  1788.         for(k = 1; k < 64; k++)

  1789.             if(block[k]) {

  1790.                 block[k] *= scale;

  1791.                 if(!v->pquantizer)

  1792.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1793.             }

  1794. 

  1795.         if(s->ac_pred) i = 63;

  1796.     }

  1797. 

  1798. not_coded:

  1799.     if(!coded) {

  1800.         int k, scale;

  1801.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1802.         ac_val2 = ac_val;

  1803. 

  1804.         scale = v->pq * 2 + v->halfpq;

  1805.         memset(ac_val2, 0, 16 * 2);

  1806.         if(dc_pred_dir) {//left

  1807.             ac_val -= 16;

  1808.             if(s->ac_pred)

  1809.                 memcpy(ac_val2, ac_val, 8 * 2);

  1810.         } else {//top

  1811.             ac_val -= 16 * s->block_wrap[n];

  1812.             if(s->ac_pred)

  1813.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1814.         }

  1815. 

  1816.         /* apply AC prediction if needed */

  1817.         if(s->ac_pred) {

  1818.             if(dc_pred_dir) { //left

  1819.                 for(k = 1; k < 8; k++) {

  1820.                     block[k << 3] = ac_val[k] * scale;

  1821.                     if(!v->pquantizer)

  1822.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  1823.                 }

  1824.             } else { //top

  1825.                 for(k = 1; k < 8; k++) {

  1826.                     block[k] = ac_val[k + 8] * scale;

  1827.                     if(!v->pquantizer)

  1828.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1829.                 }

  1830.             }

  1831.             i = 63;

  1832.         }

  1833.     }

  1834.     s->block_last_index[n] = i;

  1835. 

  1836.     return 0;

  1837. }

  1838. 

  1839. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  1840.  * @param v VC1Context

  1841.  * @param block block to decode

  1842.  * @param coded are AC coeffs present or not

  1843.  * @param mquant block quantizer

  1844.  * @param codingset set of VLC to decode data

  1845.  */

  1846. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  1847. {

  1848.     GetBitContext *gb = &v->s.gb;

  1849.     MpegEncContext *s = &v->s;

  1850.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1851.     int run_diff, i;

  1852.     int16_t *dc_val;

  1853.     int16_t *ac_val, *ac_val2;

  1854.     int dcdiff;

  1855.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1856.     int a_avail, c_avail;

  1857. 

  1858.     /* XXX: Guard against dumb values of mquant */

  1859.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  1860. 

  1861.     /* Set DC scale - y and c use the same */

  1862.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  1863.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  1864. 

  1865.     /* check if prediction blocks A and C are available */

  1866.     a_avail = c_avail = 0;

  1867.     if((n == 2 || n == 3) || (s->mb_y && IS_INTRA(s->current_picture.mb_type[mb_pos - s->mb_stride])))

  1868.         a_avail = 1;

  1869.     if((n == 1 || n == 3) || (s->mb_x && IS_INTRA(s->current_picture.mb_type[mb_pos - 1])))

  1870.         c_avail = 1;

  1871.     /* Get DC differential */

  1872.     if (n < 4) {

  1873.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1874.     } else {

  1875.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1876.     }

  1877.     if (dcdiff < 0){

  1878.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1879.         return -1;

  1880.     }

  1881.     if (dcdiff)

  1882.     {

  1883.         if (dcdiff == 119 /* ESC index value */)

  1884.         {

  1885.             /* TODO: Optimize */

  1886.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  1887.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  1888.             else dcdiff = get_bits(gb, 8);

  1889.         }

  1890.         else

  1891.         {

  1892.             if (mquant == 1)

  1893.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1894.             else if (mquant == 2)

  1895.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1896.         }

  1897.         if (get_bits(gb, 1))

  1898.             dcdiff = -dcdiff;

  1899.     }

  1900. 

  1901.     /* Prediction */

  1902.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  1903.     *dc_val = dcdiff;

  1904. 

  1905.     /* Store the quantized DC coeff, used for prediction */

  1906. 

  1907.     if (n < 4) {

  1908.         block[0] = dcdiff * s->y_dc_scale;

  1909.     } else {

  1910.         block[0] = dcdiff * s->c_dc_scale;

  1911.     }

  1912.     /* Skip ? */

  1913.     run_diff = 0;

  1914.     i = 0;

  1915.     if (!coded) {

  1916.         goto not_coded;

  1917.     }

  1918. 

  1919.     //AC Decoding

  1920.     i = 1;

  1921. 

  1922.     {

  1923.         int last = 0, skip, value;

  1924.         const int8_t *zz_table;

  1925.         int scale;

  1926.         int k;

  1927. 

  1928.         scale = mquant * 2 + v->halfpq;

  1929. 

  1930.         zz_table = vc1_simple_progressive_8x8_zz;

  1931. 

  1932.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1933.         ac_val2 = ac_val;

  1934.         if(dc_pred_dir) //left

  1935.             ac_val -= 16;

  1936.         else //top

  1937.             ac_val -= 16 * s->block_wrap[n];

  1938. 

  1939.         while (!last) {

  1940.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1941.             i += skip;

  1942.             if(i > 63)

  1943.                 break;

  1944.             block[zz_table[i++]] = value;

  1945.         }

  1946. 

  1947.         /* apply AC prediction if needed */

  1948.         if(s->ac_pred) {

  1949.             /* scale predictors if needed*/

  1950.             int mb_pos2, q1, q2;

  1951. 

  1952.             mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  1953.             q1 = s->current_picture.qscale_table[mb_pos];

  1954.             q2 = s->current_picture.qscale_table[mb_pos2];

  1955. 

  1956.             if(!c_avail) {

  1957.                 memset(ac_val, 0, 8 * sizeof(ac_val[0]));

  1958.                 dc_pred_dir = 0;

  1959.             }

  1960.             if(!a_avail) {

  1961.                 memset(ac_val + 8, 0, 8 * sizeof(ac_val[0]));

  1962.                 dc_pred_dir = 1;

  1963.             }

  1964.             if(!q1 && q1 && q2 && q1 != q2) {

  1965.                 q1 = q1 * 2 - 1;

  1966.                 q2 = q2 * 2 - 1;

  1967. 

  1968.                 if(dc_pred_dir) { //left

  1969.                     for(k = 1; k < 8; k++)

  1970.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1971.                 } else { //top

  1972.                     for(k = 1; k < 8; k++)

  1973.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1974.                 }

  1975.             } else {

  1976.                 if(dc_pred_dir) { //left

  1977.                     for(k = 1; k < 8; k++)

  1978.                         block[k << 3] += ac_val[k];

  1979.                 } else { //top

  1980.                     for(k = 1; k < 8; k++)

  1981.                         block[k] += ac_val[k + 8];

  1982.                 }

  1983.             }

  1984.         }

  1985.         /* save AC coeffs for further prediction */

  1986.         for(k = 1; k < 8; k++) {

  1987.             ac_val2[k] = block[k << 3];

  1988.             ac_val2[k + 8] = block[k];

  1989.         }

  1990. 

  1991.         /* scale AC coeffs */

  1992.         for(k = 1; k < 64; k++)

  1993.             if(block[k]) {

  1994.                 block[k] *= scale;

  1995.                 if(!v->pquantizer)

  1996.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  1997.             }

  1998. 

  1999.         if(s->ac_pred) i = 63;

  2000.     }

  2001. 

  2002. not_coded:

  2003.     if(!coded) {

  2004.         int k, scale;

  2005.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2006.         ac_val2 = ac_val;

  2007. 

  2008.         if(!c_avail) {

  2009.             memset(ac_val, 0, 8 * sizeof(ac_val[0]));

  2010.             dc_pred_dir = 0;

  2011.         }

  2012.         if(!a_avail) {

  2013.             memset(ac_val + 8, 0, 8 * sizeof(ac_val[0]));

  2014.             dc_pred_dir = 1;

  2015.         }

  2016. 

  2017.         scale = mquant * 2 + v->halfpq;

  2018.         memset(ac_val2, 0, 16 * 2);

  2019.         if(dc_pred_dir) {//left

  2020.             ac_val -= 16;

  2021.             if(s->ac_pred)

  2022.                 memcpy(ac_val2, ac_val, 8 * 2);

  2023.         } else {//top

  2024.             ac_val -= 16 * s->block_wrap[n];

  2025.             if(s->ac_pred)

  2026.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2027.         }

  2028. 

  2029.         /* apply AC prediction if needed */

  2030.         if(s->ac_pred) {

  2031.             if(dc_pred_dir) { //left

  2032.                 for(k = 1; k < 8; k++) {

  2033.                     block[k << 3] = ac_val[k] * scale;

  2034.                     if(!v->pquantizer)

  2035.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2036.                 }

  2037.             } else { //top

  2038.                 for(k = 1; k < 8; k++) {

  2039.                     block[k] = ac_val[k + 8] * scale;

  2040.                     if(!v->pquantizer)

  2041.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2042.                 }

  2043.             }

  2044.             i = 63;

  2045.         }

  2046.     }

  2047.     s->block_last_index[n] = i;

  2048. 

  2049.     return 0;

  2050. }

  2051. 

  2052. /** Decode P block

  2053.  */

  2054. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2055. {

  2056.     MpegEncContext *s = &v->s;

  2057.     GetBitContext *gb = &s->gb;

  2058.     int i, j;

  2059.     int subblkpat = 0;

  2060.     int scale, off, idx, last, skip, value;

  2061.     int ttblk = ttmb & 7;

  2062. 

  2063.     if(ttmb == -1) {

  2064.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2065.     }

  2066.     if(ttblk == TT_4X4) {

  2067.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2068.     }

  2069.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2070.         subblkpat = decode012(gb);

  2071.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2072.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2073.     }

  2074.     scale = 2 * mquant;

  2075. 

  2076.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2077.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2078.         ttblk = TT_8X4;

  2079.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2080.     }

  2081.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2082.         ttblk = TT_4X8;

  2083.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2084.     }

  2085. 

  2086.     switch(ttblk) {

  2087.     case TT_8X8:

  2088.         i = 0;

  2089.         last = 0;

  2090.         while (!last) {

  2091.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2092.             i += skip;

  2093.             if(i > 63)

  2094.                 break;

  2095.             idx = vc1_simple_progressive_8x8_zz[i++];

  2096.             block[idx] = value * scale;

  2097.         }

  2098.         vc1_inv_trans(block, 8, 8);

  2099.         break;

  2100.     case TT_4X4:

  2101.         for(j = 0; j < 4; j++) {

  2102.             last = subblkpat & (1 << (3 - j));

  2103.             i = 0;

  2104.             off = (j & 1) * 4 + (j & 2) * 32;

  2105.             while (!last) {

  2106.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2107.                 i += skip;

  2108.                 if(i > 15)

  2109.                     break;

  2110.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2111.                 block[idx + off] = value * scale;

  2112.             }

  2113.             vc1_inv_trans(block + off, 4, 4);

  2114.         }

  2115.         break;

  2116.     case TT_8X4:

  2117.         for(j = 0; j < 2; j++) {

  2118.             last = subblkpat & (1 << (1 - j));

  2119.             i = 0;

  2120.             off = j * 32;

  2121.             while (!last) {

  2122.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2123.                 i += skip;

  2124.                 if(i > 31)

  2125.                     break;

  2126.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2127.                 block[idx + off] = value * scale;

  2128.             }

  2129.             if(!(subblkpat & (1 << (1 - j)))) vc1_inv_trans(block + off, 8, 4);

  2130.         }

  2131.         break;

  2132.     case TT_4X8:

  2133.         for(j = 0; j < 2; j++) {

  2134.             last = subblkpat & (1 << (1 - j));

  2135.             i = 0;

  2136.             off = j * 4;

  2137.             while (!last) {

  2138.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2139.                 i += skip;

  2140.                 if(i > 31)

  2141.                     break;

  2142.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2143.                 block[idx + off] = value * scale;

  2144.             }

  2145.             vc1_inv_trans(block + off, 4, 8);

  2146.         }

  2147.         break;

  2148.     }

  2149.     return 0;

  2150. }

  2151. 

  2152. 

  2153. /** Decode one P-frame MB (in Simple/Main profile)

  2154.  * @todo TODO: Extend to AP

  2155.  * @fixme FIXME: DC value for inter blocks not set

  2156.  */

  2157. static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])

  2158. {

  2159.     MpegEncContext *s = &v->s;

  2160.     GetBitContext *gb = &s->gb;

  2161.     int i, j, mb_offset = s->mb_x + s->mb_y*s->mb_width; /* XXX: mb_stride */

  2162.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2163.     int cbp; /* cbp decoding stuff */

  2164.     int hybrid_pred; /* Prediction types */

  2165.     int mqdiff, mquant; /* MB quantization */

  2166.     int ttmb = v->ttmb; /* MB Transform type */

  2167.     int status;

  2168. 

  2169.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2170.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2171.     int mb_has_coeffs = 1; /* last_flag */

  2172.     int dmv_x, dmv_y; /* Differential MV components */

  2173.     int index, index1; /* LUT indices */

  2174.     int val, sign; /* temp values */

  2175.     int first_block = 1;

  2176.     int dst_idx, off;

  2177. 

  2178.     mquant = v->pq; /* Loosy initialization */

  2179. 

  2180.     if (v->mv_type_mb_plane.is_raw)

  2181.         v->mv_type_mb_plane.data[mb_offset] = get_bits(gb, 1);

  2182.     if (v->skip_mb_plane.is_raw)

  2183.         v->skip_mb_plane.data[mb_offset] = get_bits(gb, 1);

  2184.     s->current_picture.mbskip_table[mb_pos] = v->skip_mb_plane.data[mb_offset];

  2185.     if (!v->mv_type_mb_plane.data[mb_offset]) /* 1MV mode */

  2186.     {

  2187.         if (!v->skip_mb_plane.data[mb_offset])

  2188.         {

  2189.             GET_MVDATA(dmv_x, dmv_y);

  2190. 

  2191.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2192.             vc1_pred_mv(s, dmv_x, dmv_y, 1, v->range_x, v->range_y);

  2193. 

  2194.             /* FIXME Set DC val for inter block ? */

  2195.             if (s->mb_intra && !mb_has_coeffs)

  2196.             {

  2197.                 GET_MQUANT();

  2198.                 s->ac_pred = get_bits(gb, 1);

  2199.                 cbp = 0;

  2200.             }

  2201.             else if (mb_has_coeffs)

  2202.             {

  2203.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2204.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2205.                 GET_MQUANT();

  2206.             }

  2207.             else

  2208.             {

  2209.                 mquant = v->pq;

  2210.                 cbp = 0;

  2211.             }

  2212.             s->current_picture.qscale_table[mb_pos] = mquant;

  2213. 

  2214.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2215.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2216.                                 VC1_TTMB_VLC_BITS, 2);

  2217.             s->dsp.clear_blocks(block[0]);

  2218.             vc1_mc_1mv(v);

  2219.             dst_idx = 0;

  2220.             for (i=0; i<6; i++)

  2221.             {

  2222.                 s->dc_val[0][s->block_index[i]] = 0;

  2223.                 dst_idx += i >> 2;

  2224.                 val = ((cbp >> (5 - i)) & 1);

  2225.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2226.                 if(s->mb_intra) {

  2227.                     vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2228.                     vc1_inv_trans(s->block[i], 8, 8);

  2229.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2230.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2231.                 } else if(val) {

  2232.                     vc1_decode_p_block(v, block[i], i, mquant, ttmb, first_block);

  2233.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2234.                     first_block = 0;

  2235.                     s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2236.                 }

  2237.             }

  2238.         }

  2239.         else //Skipped

  2240.         {

  2241.             s->mb_intra = 0;

  2242.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2243.             vc1_pred_mv(s, 0, 0, 1, v->range_x, v->range_y);

  2244.             vc1_mc_1mv(v);

  2245.             return 0;

  2246.         }

  2247.     } //1MV mode

  2248.     else //4MV mode

  2249.     {//FIXME: looks not conforming to standard and is not even theoretically complete

  2250.         if (!v->skip_mb_plane.data[mb_offset] /* unskipped MB */)

  2251.         {

  2252.             int blk_intra[4], blk_coded[4];

  2253.             /* Get CBPCY */

  2254.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2255.             for (i=0; i<4; i++)

  2256.             {

  2257.                 val = ((cbp >> (5 - i)) & 1);

  2258.                 blk_intra[i] = 0;

  2259.                 blk_coded[i] = val;

  2260.                 if(val) {

  2261.                     GET_MVDATA(dmv_x, dmv_y);

  2262.                     blk_intra[i] = s->mb_intra;

  2263.                 }

  2264.                 if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)

  2265.                     hybrid_pred = get_bits(gb, 1);

  2266.             }

  2267.             if((blk_intra[0] | blk_intra[1] | blk_intra[2] | blk_intra[3]) ||

  2268.                 (blk_coded[0] | blk_coded[1] | blk_coded[2] | blk_coded[3])) {

  2269.                 GET_MQUANT();

  2270. 

  2271.                 if (s->mb_intra /* One of the 4 blocks is intra */

  2272.                     /* non-zero pred for that block */)

  2273.                     s->ac_pred = get_bits(gb, 1);

  2274.                 if (!v->ttmbf)

  2275.                     ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2276.                                     VC1_TTMB_VLC_BITS, 12);

  2277.                 for(i = 0; i < 6; i++) {

  2278.                     val = ((cbp >> (5 - i)) & 1);

  2279.                     if(i & 4 || blk_intra[i] || val) {

  2280.                         if(i < 4 && blk_intra[i])

  2281.                             status = vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2282.                         else

  2283.                             status = vc1_decode_p_block(v, block[i], i, mquant, ttmb, 0);

  2284.                     }

  2285.                 }

  2286.             }

  2287.             return status;

  2288.         }

  2289.         else //Skipped MB

  2290.         {

  2291.             /* XXX: Skipped => cbp=0 and mquant doesn't matter ? */

  2292.             for (i=0; i<4; i++)

  2293.             {

  2294.                 if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)

  2295.                     hybrid_pred = get_bits(gb, 1);

  2296.             }

  2297.             /* TODO: blah */

  2298.             return 0;

  2299.         }

  2300.     }

  2301. 

  2302.     /* Should never happen */

  2303.     return -1;

  2304. }

  2305. 

  2306. /** Decode blocks of I-frame

  2307.  */

  2308. static void vc1_decode_i_blocks(VC1Context *v)

  2309. {

  2310.     int k;

  2311.     MpegEncContext *s = &v->s;

  2312.     int cbp, val;

  2313.     uint8_t *coded_val;

  2314.     int mb_pos;

  2315. 

  2316.     /* select codingmode used for VLC tables selection */

  2317.     switch(v->y_ac_table_index){

  2318.     case 0:

  2319.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2320.         break;

  2321.     case 1:

  2322.         v->codingset = CS_HIGH_MOT_INTRA;

  2323.         break;

  2324.     case 2:

  2325.         v->codingset = CS_MID_RATE_INTRA;

  2326.         break;

  2327.     }

  2328. 

  2329.     switch(v->c_ac_table_index){

  2330.     case 0:

  2331.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2332.         break;

  2333.     case 1:

  2334.         v->codingset2 = CS_HIGH_MOT_INTER;

  2335.         break;

  2336.     case 2:

  2337.         v->codingset2 = CS_MID_RATE_INTER;

  2338.         break;

  2339.     }

  2340. 

  2341.     /* Set DC scale - y and c use the same */

  2342.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2343.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2344. 

  2345.     //do frame decode

  2346.     s->mb_x = s->mb_y = 0;

  2347.     s->mb_intra = 1;

  2348.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2349.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2350.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2351.             ff_init_block_index(s);

  2352.             ff_update_block_index(s);

  2353.             s->dsp.clear_blocks(s->block[0]);

  2354.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2355.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2356.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2357. 

  2358.             // do actual MB decoding and displaying

  2359.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2360.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2361. 

  2362.             for(k = 0; k < 6; k++) {

  2363.                 val = ((cbp >> (5 - k)) & 1);

  2364.                 if (k < 4) {

  2365.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2366.                     val = val ^ pred;

  2367.                     *coded_val = val;

  2368.                 }

  2369.                 cbp |= val << (5 - k);

  2370. 

  2371.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2372. 

  2373.                 vc1_inv_trans(s->block[k], 8, 8);

  2374.                 if(v->pq >= 9 && v->overlap) {

  2375.                     vc1_overlap_block(s, s->block[k], k, (s->mb_y || k>1), (s->mb_x || (k != 0 && k != 2)));

  2376.                 }

  2377.             }

  2378. 

  2379.             vc1_put_block(v, s->block);

  2380. 

  2381.             if(get_bits_count(&s->gb) > v->bits) {

  2382.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2383.                 return;

  2384.             }

  2385.         }

  2386.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2387.     }

  2388. }

  2389. 

  2390. static void vc1_decode_p_blocks(VC1Context *v)

  2391. {

  2392.     MpegEncContext *s = &v->s;

  2393. 

  2394.     /* select codingmode used for VLC tables selection */

  2395.     switch(v->c_ac_table_index){

  2396.     case 0:

  2397.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2398.         break;

  2399.     case 1:

  2400.         v->codingset = CS_HIGH_MOT_INTRA;

  2401.         break;

  2402.     case 2:

  2403.         v->codingset = CS_MID_RATE_INTRA;

  2404.         break;

  2405.     }

  2406. 

  2407.     switch(v->c_ac_table_index){

  2408.     case 0:

  2409.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2410.         break;

  2411.     case 1:

  2412.         v->codingset2 = CS_HIGH_MOT_INTER;

  2413.         break;

  2414.     case 2:

  2415.         v->codingset2 = CS_MID_RATE_INTER;

  2416.         break;

  2417.     }

  2418. 

  2419.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2420.     s->first_slice_line = 1;

  2421.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2422.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2423.             ff_init_block_index(s);

  2424.             ff_update_block_index(s);

  2425.             s->dsp.clear_blocks(s->block[0]);

  2426. 

  2427.             vc1_decode_p_mb(v, s->block);

  2428.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2429.                 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);

  2430.                 return;

  2431.             }

  2432.         }

  2433.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2434.         s->first_slice_line = 0;

  2435.     }

  2436. }

  2437. 

  2438. static void vc1_decode_blocks(VC1Context *v)

  2439. {

  2440. 

  2441.     v->s.esc3_level_length = 0;

  2442. 

  2443.     switch(v->s.pict_type) {

  2444.     case I_TYPE:

  2445.         vc1_decode_i_blocks(v);

  2446.         break;

  2447.     case P_TYPE:

  2448.         vc1_decode_p_blocks(v);

  2449.         break;

  2450.     }

  2451. }

  2452. 

  2453. 

  2454. /** Initialize a VC1/WMV3 decoder

  2455.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2456.  * @todo TODO: Decypher remaining bits in extra_data

  2457.  */

  2458. static int vc1_decode_init(AVCodecContext *avctx)

  2459. {

  2460.     VC1Context *v = avctx->priv_data;

  2461.     MpegEncContext *s = &v->s;

  2462.     GetBitContext gb;

  2463. 

  2464.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  2465.     avctx->pix_fmt = PIX_FMT_YUV420P;

  2466.     v->s.avctx = avctx;

  2467. 

  2468.     if(ff_h263_decode_init(avctx) < 0)

  2469.         return -1;

  2470.     if (vc1_init_common(v) < 0) return -1;

  2471. 

  2472.     av_log(avctx, AV_LOG_INFO, "This decoder is not supposed to produce picture. Dont report this as a bug!\n");

  2473.     av_log(avctx, AV_LOG_INFO, "If you see a picture, don't believe your eyes.\n");

  2474. 

  2475.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  2476.     avctx->coded_width = avctx->width;

  2477.     avctx->coded_height = avctx->height;

  2478.     if (avctx->codec_id == CODEC_ID_WMV3)

  2479.     {

  2480.         int count = 0;

  2481. 

  2482.         // looks like WMV3 has a sequence header stored in the extradata

  2483.         // advanced sequence header may be before the first frame

  2484.         // the last byte of the extradata is a version number, 1 for the

  2485.         // samples we can decode

  2486. 

  2487.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  2488. 

  2489.         if (decode_sequence_header(avctx, &gb) < 0)

  2490.           return -1;

  2491. 

  2492.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  2493.         if (count>0)

  2494.         {

  2495.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  2496.                    count, get_bits(&gb, count));

  2497.         }

  2498.         else if (count < 0)

  2499.         {

  2500.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  2501.         }

  2502.     }

  2503.     avctx->has_b_frames= !!(avctx->max_b_frames);

  2504. 

  2505.     s->mb_width = (avctx->coded_width+15)>>4;

  2506.     s->mb_height = (avctx->coded_height+15)>>4;

  2507. 

  2508.     /* Allocate mb bitplanes */

  2509.     if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0)

  2510.         return -1;

  2511.     if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0)

  2512.         return -1;

  2513.     if (alloc_bitplane(&v->skip_mb_plane, s->mb_width, s->mb_height) < 0)

  2514.         return -1;

  2515.     if (alloc_bitplane(&v->direct_mb_plane, s->mb_width, s->mb_height) < 0)

  2516.         return -1;

  2517. 

  2518.     /* For predictors */

  2519.     v->previous_line_cbpcy = (uint8_t *)av_malloc(s->mb_stride*4);

  2520.     if (!v->previous_line_cbpcy) return -1;

  2521. 

  2522.     /* Init coded blocks info */

  2523.     if (v->profile == PROFILE_ADVANCED)

  2524.     {

  2525.         if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  2526.             return -1;

  2527.         if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  2528.             return -1;

  2529.     }

  2530. 

  2531.     return 0;

  2532. }

  2533. 

  2534. 

  2535. /** Decode a VC1/WMV3 frame

  2536.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2537.  * @warning Initial try at using MpegEncContext stuff

  2538.  */

  2539. static int vc1_decode_frame(AVCodecContext *avctx,

  2540.                             void *data, int *data_size,

  2541.                             uint8_t *buf, int buf_size)

  2542. {

  2543.     VC1Context *v = avctx->priv_data;

  2544.     MpegEncContext *s = &v->s;

  2545.     AVFrame *pict = data;

  2546. 

  2547.     /* no supplementary picture */

  2548.     if (buf_size == 0) {

  2549.         /* special case for last picture */

  2550.         if (s->low_delay==0 && s->next_picture_ptr) {

  2551.             *pict= *(AVFrame*)s->next_picture_ptr;

  2552.             s->next_picture_ptr= NULL;

  2553. 

  2554.             *data_size = sizeof(AVFrame);

  2555.         }

  2556. 

  2557.         return 0;

  2558.     }

  2559. 

  2560.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  2561.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  2562.         int i= ff_find_unused_picture(s, 0);

  2563.         s->current_picture_ptr= &s->picture[i];

  2564.     }

  2565. 

  2566.     avctx->has_b_frames= !s->low_delay;

  2567. 

  2568.     init_get_bits(&s->gb, buf, buf_size*8);

  2569.     // do parse frame header

  2570.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  2571.         return -1;

  2572. 

  2573.     if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;

  2574. 

  2575.     // for hurry_up==5

  2576.     s->current_picture.pict_type= s->pict_type;

  2577.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  2578. 

  2579.     /* skip B-frames if we don't have reference frames */

  2580.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  2581.     /* skip b frames if we are in a hurry */

  2582.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  2583.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  2584.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  2585.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  2586.         return buf_size;

  2587.     /* skip everything if we are in a hurry>=5 */

  2588.     if(avctx->hurry_up>=5) return -1;//buf_size;

  2589. 

  2590.     if(s->next_p_frame_damaged){

  2591.         if(s->pict_type==B_TYPE)

  2592.             return buf_size;

  2593.         else

  2594.             s->next_p_frame_damaged=0;

  2595.     }

  2596. 

  2597.     if(MPV_frame_start(s, avctx) < 0)

  2598.         return -1;

  2599. 

  2600.     ff_er_frame_start(s);

  2601. 

  2602.     v->bits = buf_size * 8;

  2603.     vc1_decode_blocks(v);

  2604. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  2605. //  if(get_bits_count(&s->gb) > buf_size * 8)

  2606. //      return -1;

  2607.     ff_er_frame_end(s);

  2608. 

  2609.     MPV_frame_end(s);

  2610. 

  2611. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  2612. assert(s->current_picture.pict_type == s->pict_type);

  2613.     if (s->pict_type == B_TYPE || s->low_delay) {

  2614.         *pict= *(AVFrame*)s->current_picture_ptr;

  2615.     } else if (s->last_picture_ptr != NULL) {

  2616.         *pict= *(AVFrame*)s->last_picture_ptr;

  2617.     }

  2618. 

  2619.     if(s->last_picture_ptr || s->low_delay){

  2620.         *data_size = sizeof(AVFrame);

  2621.         ff_print_debug_info(s, pict);

  2622.     }

  2623. 

  2624.     /* Return the Picture timestamp as the frame number */

  2625.     /* we substract 1 because it is added on utils.c    */

  2626.     avctx->frame_number = s->picture_number - 1;

  2627. 

  2628.     return buf_size;

  2629. }

  2630. 

  2631. 

  2632. /** Close a VC1/WMV3 decoder

  2633.  * @warning Initial try at using MpegEncContext stuff

  2634.  */

  2635. static int vc1_decode_end(AVCodecContext *avctx)

  2636. {

  2637.     VC1Context *v = avctx->priv_data;

  2638. 

  2639.     av_freep(&v->hrd_rate);

  2640.     av_freep(&v->hrd_buffer);

  2641.     MPV_common_end(&v->s);

  2642.     free_bitplane(&v->mv_type_mb_plane);

  2643.     free_bitplane(&v->skip_mb_plane);

  2644.     free_bitplane(&v->direct_mb_plane);

  2645.     return 0;

  2646. }

  2647. 

  2648. 

  2649. AVCodec vc1_decoder = {

  2650.     "vc1",

  2651.     CODEC_TYPE_VIDEO,

  2652.     CODEC_ID_VC1,

  2653.     sizeof(VC1Context),

  2654.     vc1_decode_init,

  2655.     NULL,

  2656.     vc1_decode_end,

  2657.     vc1_decode_frame,

  2658.     CODEC_CAP_DELAY,

  2659.     NULL

  2660. };

  2661. 

  2662. AVCodec wmv3_decoder = {

  2663.     "wmv3",

  2664.     CODEC_TYPE_VIDEO,

  2665.     CODEC_ID_WMV3,

  2666.     sizeof(VC1Context),

  2667.     vc1_decode_init,

  2668.     NULL,

  2669.     vc1_decode_end,

  2670.     vc1_decode_frame,

  2671.     CODEC_CAP_DELAY,

  2672.     NULL

  2673. };