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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. /** The VC1 Context

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

  208.  * Many members are only used for Advanced Profile

  209.  */

  210. typedef struct VC1Context{

  211.     MpegEncContext s;

  212. 

  213.     int bits;

  214. 

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

  216.     //@{

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

  218.     int res_x8;           ///< reserved

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

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

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

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

  223.                           ///< at frame level

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

  225.     int reserved;         ///< reserved

  226.     //@}

  227. 

  228.     /** Advanced Profile */

  229.     //@{

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

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

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

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

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

  235.     int tfcntrflag;       ///< TFCNTR present

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

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

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

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

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

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

  242.                           ///< Decoder parameters

  243.     //@}

  244. 

  245.     /** Sequence header data for all Profiles

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

  247.      */

  248.     //@{

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

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

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

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

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

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

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

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

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

  258.     int finterpflag;      ///< INTERPFRM present

  259.     //@}

  260. 

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

  262.     //@{

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

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

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

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

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

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

  269.     /** pquant parameters */

  270.     //@{

  271.     uint8_t dquantfrm;

  272.     uint8_t dqprofile;

  273.     uint8_t dqsbedge;

  274.     uint8_t dqbilevel;

  275.     //@}

  276.     /** AC coding set indexes

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

  278.      */

  279.     //@{

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

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

  282.     //@}

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

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

  285.     int ttmb;             ///< Transform type

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

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

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

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

  290.     int a_avail, c_avail;

  291. 

  292. 

  293.     /** Luma compensation parameters */

  294.     //@{

  295.     uint8_t lumscale;

  296.     uint8_t lumshift;

  297.     //@}

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

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

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

  301.     int buffer_fullness;  ///< HRD info

  302.     /** Ranges:

  303.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  304.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  305.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  306.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  307.      */

  308.     uint8_t mvrange;

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

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

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

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

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

  314.     uint8_t* skip_mb_plane;       ///< bitplane for skipped MBs

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

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

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

  318. 

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

  320.     //@{

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

  322.     uint8_t interpfrm;

  323.     //@}

  324. 

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

  326.     //@{

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

  328.     uint8_t numpanscanwin;

  329.     uint8_t tfcntr;

  330.     uint8_t rptfrm, tff, rff;

  331.     uint16_t topleftx;

  332.     uint16_t toplefty;

  333.     uint16_t bottomrightx;

  334.     uint16_t bottomrighty;

  335.     uint8_t uvsamp;

  336.     uint8_t postproc;

  337.     int hrd_num_leaky_buckets;

  338.     uint8_t bit_rate_exponent;

  339.     uint8_t buffer_size_exponent;

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

  341. //    BitPlane over_flags_plane;    ///< Overflags bitplane

  342.     uint8_t condover;

  343.     uint16_t *hrd_rate, *hrd_buffer;

  344.     uint8_t *hrd_fullness;

  345.     uint8_t range_mapy_flag;

  346.     uint8_t range_mapuv_flag;

  347.     uint8_t range_mapy;

  348.     uint8_t range_mapuv;

  349.     //@}

  350. } VC1Context;

  351. 

  352. /**

  353.  * Get unary code of limited length

  354.  * @fixme FIXME Slow and ugly

  355.  * @param gb GetBitContext

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

  357.  * @param[in] len Maximum length

  358.  * @return Unary length/index

  359.  */

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

  361. {

  362. #if 1

  363.     int i;

  364. 

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

  366.     return i;

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

  368. 

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

  370.   {

  371.     tmp = get_bits(gb, 1);

  372.     i++;

  373.   }

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

  375.   return i;*/

  376. #else

  377.   unsigned int buf;

  378.   int log;

  379. 

  380.   OPEN_READER(re, gb);

  381.   UPDATE_CACHE(re, gb);

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

  383.   if (stop) buf = ~buf;

  384. 

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

  386.   if (log < limit){

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

  388.     CLOSE_READER(re, gb);

  389.     return log;

  390.   }

  391. 

  392.   LAST_SKIP_BITS(re, gb, limit);

  393.   CLOSE_READER(re, gb);

  394.   return limit;

  395. #endif

  396. }

  397. 

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

  399.     int n;

  400.     n = get_bits1(gb);

  401.     if (n == 1)

  402.         return 0;

  403.     else

  404.         return 2 - get_bits1(gb);

  405. }

  406. 

  407. /**

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

  409.  * @param v The VC1Context to initialize

  410.  * @return Status

  411.  */

  412. static int vc1_init_common(VC1Context *v)

  413. {

  414.     static int done = 0;

  415.     int i = 0;

  416. 

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

  418. 

  419.     /* VLC tables */

  420.     if(!done)

  421.     {

  422.         done = 1;

  423.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  424.                  vc1_bfraction_bits, 1, 1,

  425.                  vc1_bfraction_codes, 1, 1, 1);

  426.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  427.                  vc1_norm2_bits, 1, 1,

  428.                  vc1_norm2_codes, 1, 1, 1);

  429.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  430.                  vc1_norm6_bits, 1, 1,

  431.                  vc1_norm6_codes, 2, 2, 1);

  432.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  433.                  vc1_imode_bits, 1, 1,

  434.                  vc1_imode_codes, 1, 1, 1);

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

  436.         {

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

  438.                      vc1_ttmb_bits[i], 1, 1,

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

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

  441.                      vc1_ttblk_bits[i], 1, 1,

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

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

  444.                      vc1_subblkpat_bits[i], 1, 1,

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

  446.         }

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

  448.         {

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

  450.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  453.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  456.                      vc1_mv_diff_bits[i], 1, 1,

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

  458.         }

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

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

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

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

  463.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  466.     }

  467. 

  468.     /* Other defaults */

  469.     v->pq = -1;

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

  471. 

  472.     return 0;

  473. }

  474. 

  475. /***********************************************************************/

  476. /**

  477.  * @defgroup bitplane VC9 Bitplane decoding

  478.  * @see 8.7, p56

  479.  * @{

  480.  */

  481. 

  482. /** @addtogroup bitplane

  483.  * Imode types

  484.  * @{

  485.  */

  486. enum Imode {

  487.     IMODE_RAW,

  488.     IMODE_NORM2,

  489.     IMODE_DIFF2,

  490.     IMODE_NORM6,

  491.     IMODE_DIFF6,

  492.     IMODE_ROWSKIP,

  493.     IMODE_COLSKIP

  494. };

  495. /** @} */ //imode defines

  496. 

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

  498.  * @param plane Buffer to store decoded bits

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

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

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

  502.  */

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

  504.     int x, y;

  505. 

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

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

  508.             memset(plane, 0, width);

  509.         else

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

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

  512.         plane += stride;

  513.     }

  514. }

  515. 

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

  517.  * @param plane Buffer to store decoded bits

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

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

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

  521.  * @fixme FIXME: Optimize

  522.  */

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

  524.     int x, y;

  525. 

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

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

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

  529.                 plane[y*stride] = 0;

  530.         else

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

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

  533.         plane ++;

  534.     }

  535. }

  536. 

  537. /** Decode a bitplane's bits

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

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

  540.  * @return Status

  541.  * @fixme FIXME: Optimize

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

  543.  */

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

  545. {

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

  547. 

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

  549.     uint8_t invert, *planep = data;

  550.     int width, height, stride;

  551. 

  552.     width = v->s.mb_width;

  553.     height = v->s.mb_height;

  554.     stride = v->s.mb_stride;

  555.     invert = get_bits(gb, 1);

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

  557. 

  558.     *raw_flag = 0;

  559.     switch (imode)

  560.     {

  561.     case IMODE_RAW:

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

  563.         *raw_flag = 1; //invert ignored

  564.         return invert;

  565.     case IMODE_DIFF2:

  566.     case IMODE_NORM2:

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

  568.         {

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

  570.             offset = 1;

  571.         }

  572.         else offset = 0;

  573.         // decode bitplane as one long line

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

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

  576.             *planep++ = code & 1;

  577.             offset++;

  578.             if(offset == width) {

  579.                 offset = 0;

  580.                 planep += stride - width;

  581.             }

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

  583.             offset++;

  584.             if(offset == width) {

  585.                 offset = 0;

  586.                 planep += stride - width;

  587.             }

  588.         }

  589.         break;

  590.     case IMODE_DIFF6:

  591.     case IMODE_NORM6:

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

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

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

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

  596.                     if(code < 0){

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

  598.                         return -1;

  599.                     }

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

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

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

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

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

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

  606.                 }

  607.                 planep += stride * 3;

  608.             }

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

  610.         } else { // 3x2

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

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

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

  614.                     if(code < 0){

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

  616.                         return -1;

  617.                     }

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

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

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

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

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

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

  624.                 }

  625.                 planep += stride * 2;

  626.             }

  627.             x = width % 3;

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

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

  630.         }

  631.         break;

  632.     case IMODE_ROWSKIP:

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

  634.         break;

  635.     case IMODE_COLSKIP:

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

  637.         break;

  638.     default: break;

  639.     }

  640. 

  641.     /* Applying diff operator */

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

  643.     {

  644.         planep = data;

  645.         planep[0] ^= invert;

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

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

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

  649.         {

  650.             planep += stride;

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

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

  653.             {

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

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

  656.             }

  657.         }

  658.     }

  659.     else if (invert)

  660.     {

  661.         planep = data;

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

  663.     }

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

  665. }

  666. 

  667. /** @} */ //Bitplane group

  668. 

  669. /***********************************************************************/

  670. /** VOP Dquant decoding

  671.  * @param v VC-1 Context

  672.  */

  673. static int vop_dquant_decoding(VC1Context *v)

  674. {

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

  676.     int pqdiff;

  677. 

  678.     //variable size

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

  680.     {

  681.         pqdiff = get_bits(gb, 3);

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

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

  684.     }

  685.     else

  686.     {

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

  688.         if ( v->dquantfrm )

  689.         {

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

  691.             switch (v->dqprofile)

  692.             {

  693.             case DQPROFILE_SINGLE_EDGE:

  694.             case DQPROFILE_DOUBLE_EDGES:

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

  696.                 break;

  697.             case DQPROFILE_ALL_MBS:

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

  699.             default: break; //Forbidden ?

  700.             }

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

  702.             {

  703.                 pqdiff = get_bits(gb, 3);

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

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

  706.             }

  707.         }

  708.     }

  709.     return 0;

  710. }

  711. 

  712. 

  713. /** Do inverse transform

  714.  */

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

  716. {

  717.     int i;

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

  719.     DCTELEM *src, *dst;

  720. 

  721.     src = block;

  722.     dst = block;

  723.     if(M==4){

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

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

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

  727.             t3 = 22 * src[1];

  728.             t4 = 22 * src[3];

  729.             t5 = 10 * src[1];

  730.             t6 = 10 * src[3];

  731. 

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

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

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

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

  736. 

  737.             src += 8;

  738.             dst += 8;

  739.         }

  740.     }else{

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

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

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

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

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

  746. 

  747.             t5 = t1 + t3;

  748.             t6 = t2 + t4;

  749.             t7 = t2 - t4;

  750.             t8 = t1 - t3;

  751. 

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

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

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

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

  756. 

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

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

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

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

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

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

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

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

  765. 

  766.             src += 8;

  767.             dst += 8;

  768.         }

  769.     }

  770. 

  771.     src = block;

  772.     dst = block;

  773.     if(N==4){

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

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

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

  777.             t3 = 22 * src[ 8];

  778.             t4 = 22 * src[24];

  779.             t5 = 10 * src[ 8];

  780.             t6 = 10 * src[24];

  781. 

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

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

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

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

  786. 

  787.             src ++;

  788.             dst ++;

  789.         }

  790.     }else{

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

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

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

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

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

  796. 

  797.             t5 = t1 + t3;

  798.             t6 = t2 + t4;

  799.             t7 = t2 - t4;

  800.             t8 = t1 - t3;

  801. 

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

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

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

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

  806. 

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

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

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

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

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

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

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

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

  815. 

  816.             src++;

  817.             dst++;

  818.         }

  819.     }

  820. }

  821. 

  822. /** Apply overlap transform

  823.  * @todo optimize

  824.  * @todo move to DSPContext

  825.  */

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

  827. {

  828.     int i;

  829. 

  830.     if(do_hor) { //TODO

  831.     }

  832.     if(do_vert) { //TODO

  833.     }

  834. 

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

  836.         block[i] += 128;

  837. }

  838. 

  839. 

  840. static void vc1_v_overlap(uint8_t* src, int stride)

  841. {

  842.     int i;

  843.     int a, b, c, d;

  844.     for(i = 0; i < 8; i++) {

  845.         a = src[-2*stride];

  846.         b = src[-stride];

  847.         c = src[0];

  848.         d = src[stride];

  849. 

  850.         src[-2*stride] = (7*a + d) >> 3;

  851.         src[-stride] = (-a + 7*b + c + d) >> 3;

  852.         src[0] = (a + b + 7*c - d) >> 3;

  853.         src[stride] = (a + 7*d) >> 3;

  854.         src++;

  855.     }

  856. }

  857. 

  858. static void vc1_h_overlap(uint8_t* src, int stride)

  859. {

  860.     int i;

  861.     int a, b, c, d;

  862.     for(i = 0; i < 8; i++) {

  863.         a = src[-2];

  864.         b = src[-1];

  865.         c = src[0];

  866.         d = src[1];

  867. 

  868.         src[-2] = (7*a + d) >> 3;

  869.         src[-1] = (-a + 7*b + c + d) >> 3;

  870.         src[0] = (a + b + 7*c - d) >> 3;

  871.         src[1] = (a + 7*d) >> 3;

  872.         src += stride;

  873.     }

  874. }

  875. 

  876. /** Put block onto picture

  877.  * @todo move to DSPContext

  878.  */

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

  880. {

  881.     uint8_t *Y;

  882.     int ys, us, vs;

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

  884. 

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

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

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

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

  889. 

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

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

  892.     Y += ys * 8;

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

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

  895. 

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

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

  898. }

  899. 

  900. /* clip motion vector as specified in 8.3.6.5 */

  901. #define CLIP_RANGE(mv, src, lim, bs)      \

  902.     if(mv < -bs) mv = -bs - src * bs; \

  903.     if(mv > lim) mv = lim - src * bs;

  904. 

  905. /** Do motion compensation over 1 macroblock

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

  907.  */

  908. static void vc1_mc_1mv(VC1Context *v)

  909. {

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

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

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

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

  914. 

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

  916. 

  917.     mx = s->mv[0][0][0];

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

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

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

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

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

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

  924. 

  925.     if(v->fastuvmc) { // XXX: 8.3.5.4.5 specifies something different

  926.         uvmx = (uvmx + 1) & ~1;

  927.         uvmy = (uvmy + 1) & ~1;

  928.     }

  929. 

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

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

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

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

  934. 

  935.     CLIP_RANGE(  src_x, s->mb_x, s->mb_width  * 16, 16);

  936.     CLIP_RANGE(  src_y, s->mb_y, s->mb_height * 16, 16);

  937.     CLIP_RANGE(uvsrc_x, s->mb_x, s->mb_width  *  8,  8);

  938.     CLIP_RANGE(uvsrc_y, s->mb_y, s->mb_height *  8,  8);

  939. 

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

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

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

  943. 

  944.     if((unsigned)src_x > s->h_edge_pos - (mx&3) - 16

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

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

  947. 

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

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

  950.         srcY = s->edge_emu_buffer;

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

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

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

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

  955.         srcU = uvbuf;

  956.         srcV = uvbuf + 16;

  957.     }

  958. 

  959.     if(!s->quarter_sample) { // hpel mc

  960.         mx >>= 1;

  961.         my >>= 1;

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

  963.         uvdxy = 0;

  964. 

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

  966.     } else {

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

  968.         uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);

  969. 

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

  971.     }

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

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

  974. //    dsp->put_mspel_pixels_tab[uvdxy](s->dest[1], srcU, s->uvlinesize);

  975. //    dsp->put_mspel_pixels_tab[uvdxy](s->dest[2], srcV, s->uvlinesize);

  976. }

  977. 

  978. /**

  979.  * Decode Simple/Main Profiles sequence header

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

  981.  * @param avctx Codec context

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

  983.  * @return Status

  984.  */

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

  986. {

  987.     VC1Context *v = avctx->priv_data;

  988. 

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

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

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

  992.     {

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

  994.         return -1;

  995.     }

  996. 

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

  998.     {

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

  1000.         if(v->level >= 5)

  1001.         {

  1002.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1003.         }

  1004.         v->chromaformat = get_bits(gb, 2);

  1005.         if (v->chromaformat != 1)

  1006.         {

  1007.             av_log(avctx, AV_LOG_ERROR,

  1008.                    "Only 4:2:0 chroma format supported\n");

  1009.             return -1;

  1010.         }

  1011.     }

  1012.     else

  1013.     {

  1014.         v->res_sm = get_bits(gb, 2); //reserved

  1015.         if (v->res_sm)

  1016.         {

  1017.             av_log(avctx, AV_LOG_ERROR,

  1018.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1019.             return -1;

  1020.         }

  1021.     }

  1022. 

  1023.     // (fps-2)/4 (->30)

  1024.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1025.     // (bitrate-32kbps)/64kbps

  1026.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1027.     v->s.loop_filter = get_bits(gb, 1); //common

  1028.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1029.     {

  1030.         av_log(avctx, AV_LOG_ERROR,

  1031.                "LOOPFILTER shell not be enabled in simple profile\n");

  1032.     }

  1033. 

  1034.     if (v->profile < PROFILE_ADVANCED)

  1035.     {

  1036.         v->res_x8 = get_bits(gb, 1); //reserved

  1037.         if (v->res_x8)

  1038.         {

  1039.             av_log(avctx, AV_LOG_ERROR,

  1040.                    "1 for reserved RES_X8 is forbidden\n");

  1041.             //return -1;

  1042.         }

  1043.         v->multires = get_bits(gb, 1);

  1044.         v->res_fasttx = get_bits(gb, 1);

  1045.         if (!v->res_fasttx)

  1046.         {

  1047.             av_log(avctx, AV_LOG_ERROR,

  1048.                    "0 for reserved RES_FASTTX is forbidden\n");

  1049.             //return -1;

  1050.         }

  1051.     }

  1052. 

  1053.     v->fastuvmc =  get_bits(gb, 1); //common

  1054.     if (!v->profile && !v->fastuvmc)

  1055.     {

  1056.         av_log(avctx, AV_LOG_ERROR,

  1057.                "FASTUVMC unavailable in Simple Profile\n");

  1058.         return -1;

  1059.     }

  1060.     v->extended_mv =  get_bits(gb, 1); //common

  1061.     if (!v->profile && v->extended_mv)

  1062.     {

  1063.         av_log(avctx, AV_LOG_ERROR,

  1064.                "Extended MVs unavailable in Simple Profile\n");

  1065.         return -1;

  1066.     }

  1067.     v->dquant =  get_bits(gb, 2); //common

  1068.     v->vstransform =  get_bits(gb, 1); //common

  1069. 

  1070.     if (v->profile < PROFILE_ADVANCED)

  1071.     {

  1072.         v->res_transtab = get_bits(gb, 1);

  1073.         if (v->res_transtab)

  1074.         {

  1075.             av_log(avctx, AV_LOG_ERROR,

  1076.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1077.             return -1;

  1078.         }

  1079.     }

  1080. 

  1081.     v->overlap = get_bits(gb, 1); //common

  1082. 

  1083.     if (v->profile < PROFILE_ADVANCED)

  1084.     {

  1085.         v->s.resync_marker = get_bits(gb, 1);

  1086.         v->rangered = get_bits(gb, 1);

  1087.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1088.         {

  1089.             av_log(avctx, AV_LOG_INFO,

  1090.                    "RANGERED should be set to 0 in simple profile\n");

  1091.         }

  1092.     }

  1093. 

  1094.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1095.     v->quantizer_mode = get_bits(gb, 2); //common

  1096. 

  1097.     if (v->profile < PROFILE_ADVANCED)

  1098.     {

  1099.         v->finterpflag = get_bits(gb, 1); //common

  1100.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1101.         if (!v->res_rtm_flag)

  1102.         {

  1103.             av_log(avctx, AV_LOG_ERROR,

  1104.                    "0 for reserved RES_RTM_FLAG is forbidden\n");

  1105.             //return -1;

  1106.         }

  1107.         av_log(avctx, AV_LOG_DEBUG,

  1108.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1109.                "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"

  1110.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1111.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1112.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1113.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1114.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1115.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1116.                );

  1117.         return 0;

  1118.     }

  1119.     return -1;

  1120. }

  1121. 

  1122. 

  1123. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1124. {

  1125.     int pqindex, lowquant, status;

  1126. 

  1127.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1128.     skip_bits(gb, 2); //framecnt unused

  1129.     v->rangeredfrm = 0;

  1130.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1131.     v->s.pict_type = get_bits(gb, 1);

  1132.     if (v->s.avctx->max_b_frames) {

  1133.         if (!v->s.pict_type) {

  1134.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1135.             else v->s.pict_type = B_TYPE;

  1136.         } else v->s.pict_type = P_TYPE;

  1137.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1138. 

  1139.     if(v->s.pict_type == I_TYPE)

  1140.         get_bits(gb, 7); // skip buffer fullness

  1141. 

  1142.     /* Quantizer stuff */

  1143.     pqindex = get_bits(gb, 5);

  1144.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1145.         v->pq = pquant_table[0][pqindex];

  1146.     else

  1147.         v->pq = pquant_table[v->quantizer_mode-1][pqindex];

  1148. 

  1149.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1150.         v->pquantizer = pqindex < 9;

  1151.     if (v->quantizer_mode == QUANT_UNIFORM || v->quantizer_mode == QUANT_NON_UNIFORM)

  1152.         v->pquantizer = v->quantizer_mode == QUANT_UNIFORM;

  1153.     v->pqindex = pqindex;

  1154.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1155.     else v->halfpq = 0;

  1156.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1157.         v->pquantizer = get_bits(gb, 1);

  1158.     v->dquantfrm = 0;

  1159. 

  1160. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1161. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1162. 

  1163.     //TODO: complete parsing for P/B/BI frames

  1164.     switch(v->s.pict_type) {

  1165.     case P_TYPE:

  1166.         if (v->pq < 5) v->tt_index = 0;

  1167.         else if(v->pq < 13) v->tt_index = 1;

  1168.         else v->tt_index = 2;

  1169. 

  1170.         if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1171.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1172.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1173.         v->range_x = 1 << (v->k_x - 1);

  1174.         v->range_y = 1 << (v->k_y - 1);

  1175.         if (v->profile == PROFILE_ADVANCED)

  1176.         {

  1177.             if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1178.         }

  1179.         else

  1180.             if (v->multires) v->respic = get_bits(gb, 2);

  1181.         lowquant = (v->pq > 12) ? 0 : 1;

  1182.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1183.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1184.         {

  1185.             v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];

  1186.             v->lumscale = get_bits(gb, 6);

  1187.             v->lumshift = get_bits(gb, 6);

  1188.         }

  1189.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1190.             v->s.quarter_sample = 0;

  1191.         else

  1192.             v->s.quarter_sample = 1;

  1193. 

  1194. if(v->mv_mode != MV_PMODE_1MV && v->mv_mode != MV_PMODE_1MV_HPEL && v->mv_mode != MV_PMODE_1MV_HPEL_BILIN) {

  1195.     av_log(v->s.avctx, AV_LOG_ERROR, "Only 1MV P-frames are supported by now\n");

  1196.     return -1;

  1197. }

  1198.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1199.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1200.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1201.         {

  1202.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1203.             if (status < 0) return -1;

  1204.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1205.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1206.         } else {

  1207.             v->mv_type_is_raw = 0;

  1208.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1209.         }

  1210.         status = bitplane_decoding(v->skip_mb_plane, &v->skip_is_raw, v);

  1211.         if (status < 0) return -1;

  1212.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1213.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1214. 

  1215.         /* Hopefully this is correct for P frames */

  1216.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1217.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1218. 

  1219.         if (v->dquant)

  1220.         {

  1221.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1222.             vop_dquant_decoding(v);

  1223.         }

  1224. 

  1225.         v->ttfrm = 0; //FIXME Is that so ?

  1226.         if (v->vstransform)

  1227.         {

  1228.             v->ttmbf = get_bits(gb, 1);

  1229.             if (v->ttmbf)

  1230.             {

  1231.                 v->ttfrm = get_bits(gb, 2);

  1232.             }

  1233.         }

  1234.         break;

  1235.     case B_TYPE:

  1236.         break;

  1237.     }

  1238. 

  1239.     /* AC Syntax */

  1240.     v->c_ac_table_index = decode012(gb);

  1241.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1242.     {

  1243.         v->y_ac_table_index = decode012(gb);

  1244.     }

  1245.     /* DC Syntax */

  1246.     v->s.dc_table_index = get_bits(gb, 1);

  1247. 

  1248.     return 0;

  1249. }

  1250. 

  1251. /***********************************************************************/

  1252. /**

  1253.  * @defgroup block VC-1 Block-level functions

  1254.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1255.  * @todo TODO: Integrate to MpegEncContext facilities

  1256.  * @{

  1257.  */

  1258. 

  1259. /**

  1260.  * @def GET_MQUANT

  1261.  * @brief Get macroblock-level quantizer scale

  1262.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1263.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1264.  */

  1265. #define GET_MQUANT()                                           \

  1266.   if (v->dquantfrm)                                            \

  1267.   {                                                            \

  1268.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1269.     {                                                          \

  1270.       if (v->dqbilevel)                                        \

  1271.       {                                                        \

  1272.         mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \

  1273.       }                                                        \

  1274.       else                                                     \

  1275.       {                                                        \

  1276.         mqdiff = get_bits(gb, 3);                              \

  1277.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1278.         else mquant = get_bits(gb, 5);                         \

  1279.       }                                                        \

  1280.     }                                                          \

  1281.     else mquant = v->pq;                                       \

  1282.   }

  1283. 

  1284. /**

  1285.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1286.  * @brief Get MV differentials

  1287.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1288.  * @param _dmv_x Horizontal differential for decoded MV

  1289.  * @param _dmv_y Vertical differential for decoded MV

  1290.  * @todo TODO: Use MpegEncContext arrays to store them

  1291.  */

  1292. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1293.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1294.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1295.   if (index > 36)                                                   \

  1296.   {                                                                 \

  1297.     mb_has_coeffs = 1;                                              \

  1298.     index -= 37;                                                    \

  1299.   }                                                                 \

  1300.   else mb_has_coeffs = 0;                                           \

  1301.   s->mb_intra = 0;                                                  \

  1302.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1303.   else if (index == 35)                                             \

  1304.   {                                                                 \

  1305.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1306.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1307.   }                                                                 \

  1308.   else if (index == 36)                                             \

  1309.   {                                                                 \

  1310.     _dmv_x = 0;                                                     \

  1311.     _dmv_y = 0;                                                     \

  1312.     s->mb_intra = 1;                                                \

  1313.   }                                                                 \

  1314.   else                                                              \

  1315.   {                                                                 \

  1316.     index1 = index%6;                                               \

  1317.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1318.     else                                   val = 0;                 \

  1319.     if(size_table[index1] - val > 0)                                \

  1320.         val = get_bits(gb, size_table[index1] - val);               \

  1321.     else                                   val = 0;                 \

  1322.     sign = 0 - (val&1);                                             \

  1323.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1324.                                                                     \

  1325.     index1 = index/6;                                               \

  1326.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1327.     else                                   val = 0;                 \

  1328.     if(size_table[index1] - val > 0)                                \

  1329.         val = get_bits(gb, size_table[index1] - val);               \

  1330.     else                                   val = 0;                 \

  1331.     sign = 0 - (val&1);                                             \

  1332.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1333.   }

  1334. 

  1335. /** Predict and set motion vector

  1336.  */

  1337. static inline void vc1_pred_mv(MpegEncContext *s, int dmv_x, int dmv_y, int mv1, int r_x, int r_y)

  1338. {

  1339.     int xy, wrap, off;

  1340.     int16_t *A, *B, *C;

  1341.     int px, py;

  1342.     int sum;

  1343.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1344. 

  1345.     /* scale MV difference to be quad-pel */

  1346.     dmv_x <<= 1 - s->quarter_sample;

  1347.     dmv_y <<= 1 - s->quarter_sample;

  1348. 

  1349.     wrap = s->b8_stride;

  1350.     xy = s->block_index[0];

  1351. 

  1352.     C = s->current_picture.motion_val[0][xy - (1 << mv1)];

  1353.     A = s->current_picture.motion_val[0][xy - (wrap << mv1)];

  1354.     off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1355.     B = s->current_picture.motion_val[0][xy + ((off - wrap) << mv1)];

  1356. 

  1357.     if(!s->first_slice_line) { // predictor A is not out of bounds

  1358.         if(s->mb_width == 1) {

  1359.             px = A[0];

  1360.             py = A[1];

  1361.         } else {

  1362.             px = mid_pred(A[0], B[0], C[0]);

  1363.             py = mid_pred(A[1], B[1], C[1]);

  1364.         }

  1365.     } else if(s->mb_x) { // predictor C is not out of bounds

  1366.         px = C[0];

  1367.         py = C[1];

  1368.     } else {

  1369.         px = py = 0;

  1370.     }

  1371.     if(s->mb_intra) px = py = 0;

  1372. 

  1373.     /* Pullback MV as specified in 8.3.5.3.4 */

  1374.     {

  1375.         int qx, qy, X, Y;

  1376.         qx = s->mb_x << 6; //FIXME: add real block coords for 4MV mode

  1377.         qy = s->mb_y << 6;

  1378.         X = (s->mb_width << 6) - 4;

  1379.         Y = (s->mb_height << 6) - 4;

  1380.         if(mv1) {

  1381.             if(qx + px < -60) px = -60 - qx;

  1382.             if(qy + py < -60) py = -60 - qy;

  1383.         } else {

  1384.             if(qx + px < -28) px = -28 - qx;

  1385.             if(qy + py < -28) py = -28 - qy;

  1386.         }

  1387.         if(qx + px > X) px = X - qx;

  1388.         if(qy + py > Y) py = Y - qy;

  1389.     }

  1390.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1391.     if(!s->mb_intra && !s->first_slice_line && s->mb_x) {

  1392.         if(IS_INTRA(s->current_picture.mb_type[mb_pos - s->mb_stride]))

  1393.             sum = ABS(px) + ABS(py);

  1394.         else

  1395.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1396.         if(sum > 32) {

  1397.             if(get_bits1(&s->gb)) {

  1398.                 px = A[0];

  1399.                 py = A[1];

  1400.             } else {

  1401.                 px = C[0];

  1402.                 py = C[1];

  1403.             }

  1404.         } else {

  1405.             if(IS_INTRA(s->current_picture.mb_type[mb_pos - 1]))

  1406.                 sum = ABS(px) + ABS(py);

  1407.             else

  1408.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1409.             if(sum > 32) {

  1410.                 if(get_bits1(&s->gb)) {

  1411.                     px = A[0];

  1412.                     py = A[1];

  1413.                 } else {

  1414.                     px = C[0];

  1415.                     py = C[1];

  1416.                 }

  1417.             }

  1418.         }

  1419.     }

  1420.     /* store MV using signed modulus of MV range defined in 4.11 */

  1421.     s->mv[0][0][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1422.     s->mv[0][0][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1423. }

  1424. 

  1425. /** Get predicted DC value for I-frames only

  1426.  * prediction dir: left=0, top=1

  1427.  * @param s MpegEncContext

  1428.  * @param[in] n block index in the current MB

  1429.  * @param dc_val_ptr Pointer to DC predictor

  1430.  * @param dir_ptr Prediction direction for use in AC prediction

  1431.  */

  1432. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1433.                               int16_t **dc_val_ptr, int *dir_ptr)

  1434. {

  1435.     int a, b, c, wrap, pred, scale;

  1436.     int16_t *dc_val;

  1437.     static const uint16_t dcpred[32] = {

  1438.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1439.          114,  102,   93,   85,   79,   73,   68,   64,

  1440.           60,   57,   54,   51,   49,   47,   45,   43,

  1441.           41,   39,   38,   37,   35,   34,   33

  1442.     };

  1443. 

  1444.     /* find prediction - wmv3_dc_scale always used here in fact */

  1445.     if (n < 4)     scale = s->y_dc_scale;

  1446.     else           scale = s->c_dc_scale;

  1447. 

  1448.     wrap = s->block_wrap[n];

  1449.     dc_val= s->dc_val[0] + s->block_index[n];

  1450. 

  1451.     /* B A

  1452.      * C X

  1453.      */

  1454.     c = dc_val[ - 1];

  1455.     b = dc_val[ - 1 - wrap];

  1456.     a = dc_val[ - wrap];

  1457. 

  1458.     if (pq < 9 || !overlap)

  1459.     {

  1460.         /* Set outer values */

  1461.         if (!s->mb_y && (n!=2 && n!=3)) b=a=dcpred[scale];

  1462.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1463.     }

  1464.     else

  1465.     {

  1466.         /* Set outer values */

  1467.         if (!s->mb_y && (n!=2 && n!=3)) b=a=0;

  1468.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1469.     }

  1470. 

  1471.     if (abs(a - b) <= abs(b - c)) {

  1472.         pred = c;

  1473.         *dir_ptr = 1;//left

  1474.     } else {

  1475.         pred = a;

  1476.         *dir_ptr = 0;//top

  1477.     }

  1478. 

  1479.     /* update predictor */

  1480.     *dc_val_ptr = &dc_val[0];

  1481.     return pred;

  1482. }

  1483. 

  1484. 

  1485. /** Get predicted DC value

  1486.  * prediction dir: left=0, top=1

  1487.  * @param s MpegEncContext

  1488.  * @param[in] n block index in the current MB

  1489.  * @param dc_val_ptr Pointer to DC predictor

  1490.  * @param dir_ptr Prediction direction for use in AC prediction

  1491.  */

  1492. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1493.                               int a_avail, int c_avail,

  1494.                               int16_t **dc_val_ptr, int *dir_ptr)

  1495. {

  1496.     int a, b, c, wrap, pred, scale;

  1497.     int16_t *dc_val;

  1498.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1499.     int mb_pos2, q1, q2;

  1500. 

  1501.     /* find prediction - wmv3_dc_scale always used here in fact */

  1502.     if (n < 4)     scale = s->y_dc_scale;

  1503.     else           scale = s->c_dc_scale;

  1504. 

  1505.     wrap = s->block_wrap[n];

  1506.     dc_val= s->dc_val[0] + s->block_index[n];

  1507. 

  1508.     /* B A

  1509.      * C X

  1510.      */

  1511.     c = dc_val[ - 1];

  1512.     b = dc_val[ - 1 - wrap];

  1513.     a = dc_val[ - wrap];

  1514. 

  1515.     if(a_avail && c_avail) {

  1516.         if(abs(a - b) <= abs(b - c)) {

  1517.             pred = c;

  1518.             *dir_ptr = 1;//left

  1519.         } else {

  1520.             pred = a;

  1521.             *dir_ptr = 0;//top

  1522.         }

  1523.     } else if(a_avail) {

  1524.         pred = a;

  1525.         *dir_ptr = 0;//top

  1526.     } else if(c_avail) {

  1527.         pred = c;

  1528.         *dir_ptr = 1;//left

  1529.     } else {

  1530.         pred = 0;

  1531.         *dir_ptr = 1;//left

  1532.     }

  1533. 

  1534.     /* scale coeffs if needed */

  1535.     mb_pos2 = mb_pos - *dir_ptr - (1 - *dir_ptr) * s->mb_stride;

  1536.     q1 = s->current_picture.qscale_table[mb_pos];

  1537.     q2 = s->current_picture.qscale_table[mb_pos2];

  1538.     if(0 && q1 && q2 && q1 != q2) {

  1539.         q1 = s->y_dc_scale_table[q1];

  1540.         q2 = s->y_dc_scale_table[q2];

  1541.         pred = (pred * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1542.     }

  1543. 

  1544.     /* update predictor */

  1545.     *dc_val_ptr = &dc_val[0];

  1546.     return pred;

  1547. }

  1548. 

  1549. 

  1550. /**

  1551.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1552.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1553.  * @todo TODO: Integrate to MpegEncContext facilities

  1554.  * @{

  1555.  */

  1556. 

  1557. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1558. {

  1559.     int xy, wrap, pred, a, b, c;

  1560. 

  1561.     xy = s->block_index[n];

  1562.     wrap = s->b8_stride;

  1563. 

  1564.     /* B C

  1565.      * A X

  1566.      */

  1567.     a = s->coded_block[xy - 1       ];

  1568.     b = s->coded_block[xy - 1 - wrap];

  1569.     c = s->coded_block[xy     - wrap];

  1570. 

  1571.     if (b == c) {

  1572.         pred = a;

  1573.     } else {

  1574.         pred = c;

  1575.     }

  1576. 

  1577.     /* store value */

  1578.     *coded_block_ptr = &s->coded_block[xy];

  1579. 

  1580.     return pred;

  1581. }

  1582. 

  1583. /**

  1584.  * Decode one AC coefficient

  1585.  * @param v The VC1 context

  1586.  * @param last Last coefficient

  1587.  * @param skip How much zero coefficients to skip

  1588.  * @param value Decoded AC coefficient value

  1589.  * @see 8.1.3.4

  1590.  */

  1591. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1592. {

  1593.     GetBitContext *gb = &v->s.gb;

  1594.     int index, escape, run = 0, level = 0, lst = 0;

  1595. 

  1596.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1597.     if (index != vc1_ac_sizes[codingset] - 1) {

  1598.         run = vc1_index_decode_table[codingset][index][0];

  1599.         level = vc1_index_decode_table[codingset][index][1];

  1600.         lst = index >= vc1_last_decode_table[codingset];

  1601.         if(get_bits(gb, 1))

  1602.             level = -level;

  1603.     } else {

  1604.         escape = decode210(gb);

  1605.         if (escape != 2) {

  1606.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1607.             run = vc1_index_decode_table[codingset][index][0];

  1608.             level = vc1_index_decode_table[codingset][index][1];

  1609.             lst = index >= vc1_last_decode_table[codingset];

  1610.             if(escape == 0) {

  1611.                 if(lst)

  1612.                     level += vc1_last_delta_level_table[codingset][run];

  1613.                 else

  1614.                     level += vc1_delta_level_table[codingset][run];

  1615.             } else {

  1616.                 if(lst)

  1617.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  1618.                 else

  1619.                     run += vc1_delta_run_table[codingset][level] + 1;

  1620.             }

  1621.             if(get_bits(gb, 1))

  1622.                 level = -level;

  1623.         } else {

  1624.             int sign;

  1625.             lst = get_bits(gb, 1);

  1626.             if(v->s.esc3_level_length == 0) {

  1627.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1628.                     v->s.esc3_level_length = get_bits(gb, 3);

  1629.                     if(!v->s.esc3_level_length)

  1630.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1631.                 } else { //table 60

  1632.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1633.                 }

  1634.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1635.             }

  1636.             run = get_bits(gb, v->s.esc3_run_length);

  1637.             sign = get_bits(gb, 1);

  1638.             level = get_bits(gb, v->s.esc3_level_length);

  1639.             if(sign)

  1640.                 level = -level;

  1641.         }

  1642.     }

  1643. 

  1644.     *last = lst;

  1645.     *skip = run;

  1646.     *value = level;

  1647. }

  1648. 

  1649. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1650.  * @param v VC1Context

  1651.  * @param block block to decode

  1652.  * @param coded are AC coeffs present or not

  1653.  * @param codingset set of VLC to decode data

  1654.  */

  1655. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1656. {

  1657.     GetBitContext *gb = &v->s.gb;

  1658.     MpegEncContext *s = &v->s;

  1659.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1660.     int run_diff, i;

  1661.     int16_t *dc_val;

  1662.     int16_t *ac_val, *ac_val2;

  1663.     int dcdiff;

  1664. 

  1665.     /* Get DC differential */

  1666.     if (n < 4) {

  1667.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1668.     } else {

  1669.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1670.     }

  1671.     if (dcdiff < 0){

  1672.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1673.         return -1;

  1674.     }

  1675.     if (dcdiff)

  1676.     {

  1677.         if (dcdiff == 119 /* ESC index value */)

  1678.         {

  1679.             /* TODO: Optimize */

  1680.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1681.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1682.             else dcdiff = get_bits(gb, 8);

  1683.         }

  1684.         else

  1685.         {

  1686.             if (v->pq == 1)

  1687.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1688.             else if (v->pq == 2)

  1689.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1690.         }

  1691.         if (get_bits(gb, 1))

  1692.             dcdiff = -dcdiff;

  1693.     }

  1694. 

  1695.     /* Prediction */

  1696.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1697.     *dc_val = dcdiff;

  1698. 

  1699.     /* Store the quantized DC coeff, used for prediction */

  1700. 

  1701.     if (n < 4) {

  1702.         block[0] = dcdiff * s->y_dc_scale;

  1703.     } else {

  1704.         block[0] = dcdiff * s->c_dc_scale;

  1705.     }

  1706.     /* Skip ? */

  1707.     run_diff = 0;

  1708.     i = 0;

  1709.     if (!coded) {

  1710.         goto not_coded;

  1711.     }

  1712. 

  1713.     //AC Decoding

  1714.     i = 1;

  1715. 

  1716.     {

  1717.         int last = 0, skip, value;

  1718.         const int8_t *zz_table;

  1719.         int scale;

  1720.         int k;

  1721. 

  1722.         scale = v->pq * 2 + v->halfpq;

  1723. 

  1724.         if(v->s.ac_pred) {

  1725.             if(!dc_pred_dir)

  1726.                 zz_table = vc1_horizontal_zz;

  1727.             else

  1728.                 zz_table = vc1_vertical_zz;

  1729.         } else

  1730.             zz_table = vc1_normal_zz;

  1731. 

  1732.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1733.         ac_val2 = ac_val;

  1734.         if(dc_pred_dir) //left

  1735.             ac_val -= 16;

  1736.         else //top

  1737.             ac_val -= 16 * s->block_wrap[n];

  1738. 

  1739.         while (!last) {

  1740.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1741.             i += skip;

  1742.             if(i > 63)

  1743.                 break;

  1744.             block[zz_table[i++]] = value;

  1745.         }

  1746. 

  1747.         /* apply AC prediction if needed */

  1748.         if(s->ac_pred) {

  1749.             if(dc_pred_dir) { //left

  1750.                 for(k = 1; k < 8; k++)

  1751.                     block[k << 3] += ac_val[k];

  1752.             } else { //top

  1753.                 for(k = 1; k < 8; k++)

  1754.                     block[k] += ac_val[k + 8];

  1755.             }

  1756.         }

  1757.         /* save AC coeffs for further prediction */

  1758.         for(k = 1; k < 8; k++) {

  1759.             ac_val2[k] = block[k << 3];

  1760.             ac_val2[k + 8] = block[k];

  1761.         }

  1762. 

  1763.         /* scale AC coeffs */

  1764.         for(k = 1; k < 64; k++)

  1765.             if(block[k]) {

  1766.                 block[k] *= scale;

  1767.                 if(!v->pquantizer)

  1768.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1769.             }

  1770. 

  1771.         if(s->ac_pred) i = 63;

  1772.     }

  1773. 

  1774. not_coded:

  1775.     if(!coded) {

  1776.         int k, scale;

  1777.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1778.         ac_val2 = ac_val;

  1779. 

  1780.         scale = v->pq * 2 + v->halfpq;

  1781.         memset(ac_val2, 0, 16 * 2);

  1782.         if(dc_pred_dir) {//left

  1783.             ac_val -= 16;

  1784.             if(s->ac_pred)

  1785.                 memcpy(ac_val2, ac_val, 8 * 2);

  1786.         } else {//top

  1787.             ac_val -= 16 * s->block_wrap[n];

  1788.             if(s->ac_pred)

  1789.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1790.         }

  1791. 

  1792.         /* apply AC prediction if needed */

  1793.         if(s->ac_pred) {

  1794.             if(dc_pred_dir) { //left

  1795.                 for(k = 1; k < 8; k++) {

  1796.                     block[k << 3] = ac_val[k] * scale;

  1797.                     if(!v->pquantizer)

  1798.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  1799.                 }

  1800.             } else { //top

  1801.                 for(k = 1; k < 8; k++) {

  1802.                     block[k] = ac_val[k + 8] * scale;

  1803.                     if(!v->pquantizer)

  1804.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1805.                 }

  1806.             }

  1807.             i = 63;

  1808.         }

  1809.     }

  1810.     s->block_last_index[n] = i;

  1811. 

  1812.     return 0;

  1813. }

  1814. 

  1815. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  1816.  * @param v VC1Context

  1817.  * @param block block to decode

  1818.  * @param coded are AC coeffs present or not

  1819.  * @param mquant block quantizer

  1820.  * @param codingset set of VLC to decode data

  1821.  */

  1822. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  1823. {

  1824.     GetBitContext *gb = &v->s.gb;

  1825.     MpegEncContext *s = &v->s;

  1826.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1827.     int run_diff, i;

  1828.     int16_t *dc_val;

  1829.     int16_t *ac_val, *ac_val2;

  1830.     int dcdiff;

  1831.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1832.     int a_avail = v->a_avail, c_avail = v->c_avail;

  1833. 

  1834.     /* XXX: Guard against dumb values of mquant */

  1835.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  1836. 

  1837.     /* Set DC scale - y and c use the same */

  1838.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  1839.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  1840. 

  1841.     /* Get DC differential */

  1842.     if (n < 4) {

  1843.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1844.     } else {

  1845.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1846.     }

  1847.     if (dcdiff < 0){

  1848.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1849.         return -1;

  1850.     }

  1851.     if (dcdiff)

  1852.     {

  1853.         if (dcdiff == 119 /* ESC index value */)

  1854.         {

  1855.             /* TODO: Optimize */

  1856.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  1857.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  1858.             else dcdiff = get_bits(gb, 8);

  1859.         }

  1860.         else

  1861.         {

  1862.             if (mquant == 1)

  1863.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1864.             else if (mquant == 2)

  1865.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1866.         }

  1867.         if (get_bits(gb, 1))

  1868.             dcdiff = -dcdiff;

  1869.     }

  1870. 

  1871.     /* Prediction */

  1872.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  1873.     *dc_val = dcdiff;

  1874. 

  1875.     /* Store the quantized DC coeff, used for prediction */

  1876. 

  1877.     if (n < 4) {

  1878.         block[0] = dcdiff * s->y_dc_scale;

  1879.     } else {

  1880.         block[0] = dcdiff * s->c_dc_scale;

  1881.     }

  1882.     /* Skip ? */

  1883.     run_diff = 0;

  1884.     i = 0;

  1885.     if (!coded) {

  1886.         goto not_coded;

  1887.     }

  1888. 

  1889.     //AC Decoding

  1890.     i = 1;

  1891. 

  1892.     {

  1893.         int last = 0, skip, value;

  1894.         const int8_t *zz_table;

  1895.         int scale;

  1896.         int k;

  1897. 

  1898.         scale = mquant * 2;

  1899. 

  1900.         zz_table = vc1_simple_progressive_8x8_zz;

  1901. 

  1902.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1903.         ac_val2 = ac_val;

  1904.         if(dc_pred_dir) //left

  1905.             ac_val -= 16;

  1906.         else //top

  1907.             ac_val -= 16 * s->block_wrap[n];

  1908. 

  1909.         while (!last) {

  1910.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1911.             i += skip;

  1912.             if(i > 63)

  1913.                 break;

  1914.             block[zz_table[i++]] = value;

  1915.         }

  1916. 

  1917.         /* apply AC prediction if needed */

  1918.         if(s->ac_pred && (v->a_avail || v->c_avail)) {

  1919.             /* scale predictors if needed*/

  1920.             int mb_pos2, q1, q2;

  1921. 

  1922.             mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  1923.             q1 = s->current_picture.qscale_table[mb_pos];

  1924.             q2 = s->current_picture.qscale_table[mb_pos2];

  1925. 

  1926.             if(!c_avail) {

  1927.                 memset(ac_val, 0, 8 * sizeof(ac_val[0]));

  1928.                 dc_pred_dir = 0;

  1929.             }

  1930.             if(!a_avail) {

  1931.                 memset(ac_val + 8, 0, 8 * sizeof(ac_val[0]));

  1932.                 dc_pred_dir = 1;

  1933.             }

  1934.             if(q2 && q1 != q2) {

  1935.                 q1 = q1 * 2 - 1;

  1936.                 q2 = q2 * 2 - 1;

  1937. 

  1938.                 if(dc_pred_dir) { //left

  1939.                     for(k = 1; k < 8; k++)

  1940.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1941.                 } else { //top

  1942.                     for(k = 1; k < 8; k++)

  1943.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1944.                 }

  1945.             } else {

  1946.                 if(dc_pred_dir) { //left

  1947.                     for(k = 1; k < 8; k++)

  1948.                         block[k << 3] += ac_val[k];

  1949.                 } else { //top

  1950.                     for(k = 1; k < 8; k++)

  1951.                         block[k] += ac_val[k + 8];

  1952.                 }

  1953.             }

  1954.         }

  1955.         /* save AC coeffs for further prediction */

  1956.         for(k = 1; k < 8; k++) {

  1957.             ac_val2[k] = block[k << 3];

  1958.             ac_val2[k + 8] = block[k];

  1959.         }

  1960. 

  1961.         /* scale AC coeffs */

  1962.         for(k = 1; k < 64; k++)

  1963.             if(block[k]) {

  1964.                 block[k] *= scale;

  1965.                 if(!v->pquantizer)

  1966.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  1967.             }

  1968. 

  1969.         if(s->ac_pred) i = 63;

  1970.     }

  1971. 

  1972. not_coded:

  1973.     if(!coded) {

  1974.         int k, scale;

  1975.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1976.         ac_val2 = ac_val;

  1977. 

  1978.         if(!c_avail) {

  1979.             memset(ac_val, 0, 8 * sizeof(ac_val[0]));

  1980.             dc_pred_dir = 0;

  1981.         }

  1982.         if(!a_avail) {

  1983.             memset(ac_val + 8, 0, 8 * sizeof(ac_val[0]));

  1984.             dc_pred_dir = 1;

  1985.         }

  1986. 

  1987.         scale = mquant * 2;

  1988.         memset(ac_val2, 0, 16 * 2);

  1989.         if(dc_pred_dir) {//left

  1990.             ac_val -= 16;

  1991.             if(s->ac_pred && (v->a_avail || v->c_avail))

  1992.                 memcpy(ac_val2, ac_val, 8 * 2);

  1993.         } else {//top

  1994.             ac_val -= 16 * s->block_wrap[n];

  1995.             if(s->ac_pred && (v->a_avail || v->c_avail))

  1996.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1997.         }

  1998. 

  1999.         /* apply AC prediction if needed */

  2000.         if(s->ac_pred && (v->a_avail || v->c_avail)) {

  2001.             if(dc_pred_dir) { //left

  2002.                 for(k = 1; k < 8; k++) {

  2003.                     block[k << 3] = ac_val[k] * scale;

  2004.                     if(!v->pquantizer)

  2005.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2006.                 }

  2007.             } else { //top

  2008.                 for(k = 1; k < 8; k++) {

  2009.                     block[k] = ac_val[k + 8] * scale;

  2010.                     if(!v->pquantizer)

  2011.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2012.                 }

  2013.             }

  2014.             i = 63;

  2015.         }

  2016.     }

  2017.     s->block_last_index[n] = i;

  2018. 

  2019.     return 0;

  2020. }

  2021. 

  2022. /** Decode P block

  2023.  */

  2024. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2025. {

  2026.     MpegEncContext *s = &v->s;

  2027.     GetBitContext *gb = &s->gb;

  2028.     int i, j;

  2029.     int subblkpat = 0;

  2030.     int scale, off, idx, last, skip, value;

  2031.     int ttblk = ttmb & 7;

  2032. 

  2033.     if(ttmb == -1) {

  2034.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2035.     }

  2036.     if(ttblk == TT_4X4) {

  2037.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2038.     }

  2039.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2040.         subblkpat = decode012(gb);

  2041.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2042.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2043.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2044.     }

  2045.     scale = 2 * mquant;

  2046. 

  2047.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2048.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2049.         ttblk = TT_8X4;

  2050.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2051.     }

  2052.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2053.         ttblk = TT_4X8;

  2054.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2055.     }

  2056.     switch(ttblk) {

  2057.     case TT_8X8:

  2058.         i = 0;

  2059.         last = 0;

  2060.         while (!last) {

  2061.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2062.             i += skip;

  2063.             if(i > 63)

  2064.                 break;

  2065.             idx = vc1_simple_progressive_8x8_zz[i++];

  2066.             block[idx] = value * scale;

  2067.         }

  2068.         vc1_inv_trans(block, 8, 8);

  2069.         break;

  2070.     case TT_4X4:

  2071.         for(j = 0; j < 4; j++) {

  2072.             last = subblkpat & (1 << (3 - j));

  2073.             i = 0;

  2074.             off = (j & 1) * 4 + (j & 2) * 16;

  2075.             while (!last) {

  2076.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2077.                 i += skip;

  2078.                 if(i > 15)

  2079.                     break;

  2080.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2081.                 block[idx + off] = value * scale;

  2082.             }

  2083.             if(!(subblkpat & (1 << (3 - j))))

  2084.                 vc1_inv_trans(block + off, 4, 4);

  2085.         }

  2086.         break;

  2087.     case TT_8X4:

  2088.         for(j = 0; j < 2; j++) {

  2089.             last = subblkpat & (1 << (1 - j));

  2090.             i = 0;

  2091.             off = j * 32;

  2092.             while (!last) {

  2093.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2094.                 i += skip;

  2095.                 if(i > 31)

  2096.                     break;

  2097.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2098.                 block[idx + off] = value * scale;

  2099.             }

  2100.             if(!(subblkpat & (1 << (1 - j))))

  2101.                 vc1_inv_trans(block + off, 8, 4);

  2102.         }

  2103.         break;

  2104.     case TT_4X8:

  2105.         for(j = 0; j < 2; j++) {

  2106.             last = subblkpat & (1 << (1 - j));

  2107.             i = 0;

  2108.             off = j * 4;

  2109.             while (!last) {

  2110.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2111.                 i += skip;

  2112.                 if(i > 31)

  2113.                     break;

  2114.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2115.                 block[idx + off] = value * scale;

  2116.             }

  2117.             if(!(subblkpat & (1 << (1 - j))))

  2118.                 vc1_inv_trans(block + off, 4, 8);

  2119.         }

  2120.         break;

  2121.     }

  2122.     return 0;

  2123. }

  2124. 

  2125. 

  2126. /** Decode one P-frame MB (in Simple/Main profile)

  2127.  * @todo TODO: Extend to AP

  2128.  * @fixme FIXME: DC value for inter blocks not set

  2129.  */

  2130. static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])

  2131. {

  2132.     MpegEncContext *s = &v->s;

  2133.     GetBitContext *gb = &s->gb;

  2134.     int i, j;

  2135.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2136.     int cbp; /* cbp decoding stuff */

  2137.     int hybrid_pred; /* Prediction types */

  2138.     int mqdiff, mquant; /* MB quantization */

  2139.     int ttmb = v->ttmb; /* MB Transform type */

  2140.     int status;

  2141. 

  2142.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2143.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2144.     int mb_has_coeffs = 1; /* last_flag */

  2145.     int dmv_x, dmv_y; /* Differential MV components */

  2146.     int index, index1; /* LUT indices */

  2147.     int val, sign; /* temp values */

  2148.     int first_block = 1;

  2149.     int dst_idx, off;

  2150.     int skipped, fourmv;

  2151. 

  2152.     mquant = v->pq; /* Loosy initialization */

  2153. 

  2154.     if (v->mv_type_is_raw)

  2155.         fourmv = get_bits1(gb);

  2156.     else

  2157.         fourmv = v->mv_type_mb_plane[mb_pos];

  2158.     if (v->skip_is_raw)

  2159.         skipped = get_bits1(gb);

  2160.     else

  2161.         skipped = v->skip_mb_plane[mb_pos];

  2162. 

  2163.     if (!fourmv) /* 1MV mode */

  2164.     {

  2165.         if (!skipped)

  2166.         {

  2167.             GET_MVDATA(dmv_x, dmv_y);

  2168. 

  2169.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2170.             vc1_pred_mv(s, dmv_x, dmv_y, 1, v->range_x, v->range_y);

  2171. 

  2172.             /* FIXME Set DC val for inter block ? */

  2173.             if (s->mb_intra && !mb_has_coeffs)

  2174.             {

  2175.                 GET_MQUANT();

  2176.                 s->ac_pred = get_bits(gb, 1);

  2177.                 cbp = 0;

  2178.             }

  2179.             else if (mb_has_coeffs)

  2180.             {

  2181.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2182.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2183.                 GET_MQUANT();

  2184.             }

  2185.             else

  2186.             {

  2187.                 mquant = v->pq;

  2188.                 cbp = 0;

  2189.             }

  2190.             s->current_picture.qscale_table[mb_pos] = mquant;

  2191. 

  2192.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2193.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2194.                                 VC1_TTMB_VLC_BITS, 2);

  2195.             s->dsp.clear_blocks(block[0]);

  2196.             vc1_mc_1mv(v);

  2197.             dst_idx = 0;

  2198.             for (i=0; i<6; i++)

  2199.             {

  2200.                 s->dc_val[0][s->block_index[i]] = 0;

  2201.                 dst_idx += i >> 2;

  2202.                 val = ((cbp >> (5 - i)) & 1);

  2203.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2204.                 if(s->mb_intra) {

  2205.                     /* check if prediction blocks A and C are available */

  2206.                     v->a_avail = v->c_avail = 0;

  2207.                     if((i == 2 || i == 3) || (s->mb_y && IS_INTRA(s->current_picture.mb_type[mb_pos - s->mb_stride])))

  2208.                         v->a_avail = 1;

  2209.                     if((i == 1 || i == 3) || (s->mb_x && IS_INTRA(s->current_picture.mb_type[mb_pos - 1])))

  2210.                         v->c_avail = 1;

  2211. 

  2212.                     vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2213.                     vc1_inv_trans(block[i], 8, 8);

  2214.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2215.                     s->dsp.put_pixels_clamped(block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2216.                     /* TODO: proper loop filtering */

  2217.                     if(v->pq >= 9 && v->overlap) {

  2218.                         if(v->a_avail)

  2219.                             s->dsp.h263_v_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2220.                         if(v->c_avail)

  2221.                             s->dsp.h263_h_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2222.                     }

  2223.                 } else if(val) {

  2224.                     vc1_decode_p_block(v, block[i], i, mquant, ttmb, first_block);

  2225.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2226.                     first_block = 0;

  2227.                     s->dsp.add_pixels_clamped(block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2228.                 }

  2229.             }

  2230.         }

  2231.         else //Skipped

  2232.         {

  2233.             s->mb_intra = 0;

  2234.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2235.             vc1_pred_mv(s, 0, 0, 1, v->range_x, v->range_y);

  2236.             vc1_mc_1mv(v);

  2237.             return 0;

  2238.         }

  2239.     } //1MV mode

  2240.     else //4MV mode

  2241.     {//FIXME: looks not conforming to standard and is not even theoretically complete

  2242.         if (!skipped /* unskipped MB */)

  2243.         {

  2244.             int blk_intra[4], blk_coded[4];

  2245.             /* Get CBPCY */

  2246.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2247.             for (i=0; i<4; i++)

  2248.             {

  2249.                 val = ((cbp >> (5 - i)) & 1);

  2250.                 blk_intra[i] = 0;

  2251.                 blk_coded[i] = val;

  2252.                 if(val) {

  2253.                     GET_MVDATA(dmv_x, dmv_y);

  2254.                     blk_intra[i] = s->mb_intra;

  2255.                 }

  2256.                 if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)

  2257.                     hybrid_pred = get_bits(gb, 1);

  2258.             }

  2259.             if((blk_intra[0] | blk_intra[1] | blk_intra[2] | blk_intra[3]) ||

  2260.                 (blk_coded[0] | blk_coded[1] | blk_coded[2] | blk_coded[3])) {

  2261.                 GET_MQUANT();

  2262. 

  2263.                 if (s->mb_intra /* One of the 4 blocks is intra */

  2264.                     /* non-zero pred for that block */)

  2265.                     s->ac_pred = get_bits(gb, 1);

  2266.                 if (!v->ttmbf)

  2267.                     ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2268.                                     VC1_TTMB_VLC_BITS, 12);

  2269.                 for(i = 0; i < 6; i++) {

  2270.                     val = ((cbp >> (5 - i)) & 1);

  2271.                     if(i & 4 || blk_intra[i] || val) {

  2272.                         if(i < 4 && blk_intra[i])

  2273.                             status = vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2274.                         else

  2275.                             status = vc1_decode_p_block(v, block[i], i, mquant, ttmb, 0);

  2276.                     }

  2277.                 }

  2278.             }

  2279.             return status;

  2280.         }

  2281.         else //Skipped MB

  2282.         {

  2283.             /* XXX: Skipped => cbp=0 and mquant doesn't matter ? */

  2284.             for (i=0; i<4; i++)

  2285.             {

  2286.                 if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)

  2287.                     hybrid_pred = get_bits(gb, 1);

  2288.             }

  2289.             /* TODO: blah */

  2290.             return 0;

  2291.         }

  2292.     }

  2293. 

  2294.     /* Should never happen */

  2295.     return -1;

  2296. }

  2297. 

  2298. /** Decode blocks of I-frame

  2299.  */

  2300. static void vc1_decode_i_blocks(VC1Context *v)

  2301. {

  2302.     int k;

  2303.     MpegEncContext *s = &v->s;

  2304.     int cbp, val;

  2305.     uint8_t *coded_val;

  2306.     int mb_pos;

  2307. 

  2308.     /* select codingmode used for VLC tables selection */

  2309.     switch(v->y_ac_table_index){

  2310.     case 0:

  2311.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2312.         break;

  2313.     case 1:

  2314.         v->codingset = CS_HIGH_MOT_INTRA;

  2315.         break;

  2316.     case 2:

  2317.         v->codingset = CS_MID_RATE_INTRA;

  2318.         break;

  2319.     }

  2320. 

  2321.     switch(v->c_ac_table_index){

  2322.     case 0:

  2323.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2324.         break;

  2325.     case 1:

  2326.         v->codingset2 = CS_HIGH_MOT_INTER;

  2327.         break;

  2328.     case 2:

  2329.         v->codingset2 = CS_MID_RATE_INTER;

  2330.         break;

  2331.     }

  2332. 

  2333.     /* Set DC scale - y and c use the same */

  2334.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2335.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2336. 

  2337.     //do frame decode

  2338.     s->mb_x = s->mb_y = 0;

  2339.     s->mb_intra = 1;

  2340.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2341.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2342.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2343.             ff_init_block_index(s);

  2344.             ff_update_block_index(s);

  2345.             s->dsp.clear_blocks(s->block[0]);

  2346.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2347.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2348.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2349. 

  2350.             // do actual MB decoding and displaying

  2351.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2352.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2353. 

  2354.             for(k = 0; k < 6; k++) {

  2355.                 val = ((cbp >> (5 - k)) & 1);

  2356. 

  2357.                 if (k < 4) {

  2358.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2359.                     val = val ^ pred;

  2360.                     *coded_val = val;

  2361.                 }

  2362.                 cbp |= val << (5 - k);

  2363. 

  2364.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2365. 

  2366.                 vc1_inv_trans(s->block[k], 8, 8);

  2367.                 if(v->pq >= 9 && v->overlap) {

  2368.                     vc1_overlap_block(s, s->block[k], k, (s->mb_y || k>1), (s->mb_x || (k != 0 && k != 2)));

  2369.                 }

  2370.             }

  2371. 

  2372.             vc1_put_block(v, s->block);

  2373.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2374.                 if(s->mb_y) {

  2375.                     s->dsp.h263_v_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2376.                     s->dsp.h263_v_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2377.                     s->dsp.h263_v_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2378.                     s->dsp.h263_v_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2379.                 }

  2380.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2381.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2382.                 if(s->mb_x) {

  2383.                     s->dsp.h263_h_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2384.                     s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2385.                     s->dsp.h263_h_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2386.                     s->dsp.h263_h_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2387.                 }

  2388.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2389.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2390.             }

  2391. 

  2392.             if(get_bits_count(&s->gb) > v->bits) {

  2393.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2394.                 return;

  2395.             }

  2396.         }

  2397.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2398.     }

  2399. }

  2400. 

  2401. static void vc1_decode_p_blocks(VC1Context *v)

  2402. {

  2403.     MpegEncContext *s = &v->s;

  2404. 

  2405.     /* select codingmode used for VLC tables selection */

  2406.     switch(v->c_ac_table_index){

  2407.     case 0:

  2408.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2409.         break;

  2410.     case 1:

  2411.         v->codingset = CS_HIGH_MOT_INTRA;

  2412.         break;

  2413.     case 2:

  2414.         v->codingset = CS_MID_RATE_INTRA;

  2415.         break;

  2416.     }

  2417. 

  2418.     switch(v->c_ac_table_index){

  2419.     case 0:

  2420.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2421.         break;

  2422.     case 1:

  2423.         v->codingset2 = CS_HIGH_MOT_INTER;

  2424.         break;

  2425.     case 2:

  2426.         v->codingset2 = CS_MID_RATE_INTER;

  2427.         break;

  2428.     }

  2429. 

  2430.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2431.     s->first_slice_line = 1;

  2432.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2433.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2434.             ff_init_block_index(s);

  2435.             ff_update_block_index(s);

  2436.             s->dsp.clear_blocks(s->block[0]);

  2437. 

  2438.             vc1_decode_p_mb(v, s->block);

  2439.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2440.                 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);

  2441.                 return;

  2442.             }

  2443.         }

  2444.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2445.         s->first_slice_line = 0;

  2446.     }

  2447. }

  2448. 

  2449. static void vc1_decode_blocks(VC1Context *v)

  2450. {

  2451. 

  2452.     v->s.esc3_level_length = 0;

  2453. 

  2454.     switch(v->s.pict_type) {

  2455.     case I_TYPE:

  2456.         vc1_decode_i_blocks(v);

  2457.         break;

  2458.     case P_TYPE:

  2459.         vc1_decode_p_blocks(v);

  2460.         break;

  2461.     }

  2462. }

  2463. 

  2464. 

  2465. /** Initialize a VC1/WMV3 decoder

  2466.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2467.  * @todo TODO: Decypher remaining bits in extra_data

  2468.  */

  2469. static int vc1_decode_init(AVCodecContext *avctx)

  2470. {

  2471.     VC1Context *v = avctx->priv_data;

  2472.     MpegEncContext *s = &v->s;

  2473.     GetBitContext gb;

  2474. 

  2475.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  2476.     avctx->pix_fmt = PIX_FMT_YUV420P;

  2477.     v->s.avctx = avctx;

  2478.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  2479.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  2480. 

  2481.     if(ff_h263_decode_init(avctx) < 0)

  2482.         return -1;

  2483.     if (vc1_init_common(v) < 0) return -1;

  2484. 

  2485.     av_log(avctx, AV_LOG_INFO, "This decoder is not supposed to produce picture. Dont report this as a bug!\n");

  2486.     av_log(avctx, AV_LOG_INFO, "If you see a picture, don't believe your eyes.\n");

  2487. 

  2488.     avctx->coded_width = avctx->width;

  2489.     avctx->coded_height = avctx->height;

  2490.     if (avctx->codec_id == CODEC_ID_WMV3)

  2491.     {

  2492.         int count = 0;

  2493. 

  2494.         // looks like WMV3 has a sequence header stored in the extradata

  2495.         // advanced sequence header may be before the first frame

  2496.         // the last byte of the extradata is a version number, 1 for the

  2497.         // samples we can decode

  2498. 

  2499.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  2500. 

  2501.         if (decode_sequence_header(avctx, &gb) < 0)

  2502.           return -1;

  2503. 

  2504.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  2505.         if (count>0)

  2506.         {

  2507.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  2508.                    count, get_bits(&gb, count));

  2509.         }

  2510.         else if (count < 0)

  2511.         {

  2512.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  2513.         }

  2514.     }

  2515.     avctx->has_b_frames= !!(avctx->max_b_frames);

  2516. 

  2517.     s->mb_width = (avctx->coded_width+15)>>4;

  2518.     s->mb_height = (avctx->coded_height+15)>>4;

  2519. 

  2520.     /* Allocate mb bitplanes */

  2521.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  2522.     v->skip_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  2523. 

  2524.     /* For predictors */

  2525.     v->previous_line_cbpcy = (uint8_t *)av_malloc(s->mb_stride*4);

  2526.     if (!v->previous_line_cbpcy) return -1;

  2527. 

  2528.     /* Init coded blocks info */

  2529.     if (v->profile == PROFILE_ADVANCED)

  2530.     {

  2531. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  2532. //            return -1;

  2533. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  2534. //            return -1;

  2535.     }

  2536. 

  2537.     return 0;

  2538. }

  2539. 

  2540. 

  2541. /** Decode a VC1/WMV3 frame

  2542.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2543.  * @warning Initial try at using MpegEncContext stuff

  2544.  */

  2545. static int vc1_decode_frame(AVCodecContext *avctx,

  2546.                             void *data, int *data_size,

  2547.                             uint8_t *buf, int buf_size)

  2548. {

  2549.     VC1Context *v = avctx->priv_data;

  2550.     MpegEncContext *s = &v->s;

  2551.     AVFrame *pict = data;

  2552. 

  2553.     /* no supplementary picture */

  2554.     if (buf_size == 0) {

  2555.         /* special case for last picture */

  2556.         if (s->low_delay==0 && s->next_picture_ptr) {

  2557.             *pict= *(AVFrame*)s->next_picture_ptr;

  2558.             s->next_picture_ptr= NULL;

  2559. 

  2560.             *data_size = sizeof(AVFrame);

  2561.         }

  2562. 

  2563.         return 0;

  2564.     }

  2565. 

  2566.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  2567.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  2568.         int i= ff_find_unused_picture(s, 0);

  2569.         s->current_picture_ptr= &s->picture[i];

  2570.     }

  2571. 

  2572.     avctx->has_b_frames= !s->low_delay;

  2573. 

  2574.     init_get_bits(&s->gb, buf, buf_size*8);

  2575.     // do parse frame header

  2576.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  2577.         return -1;

  2578. 

  2579.     if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;

  2580. 

  2581.     // for hurry_up==5

  2582.     s->current_picture.pict_type= s->pict_type;

  2583.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  2584. 

  2585.     /* skip B-frames if we don't have reference frames */

  2586.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  2587.     /* skip b frames if we are in a hurry */

  2588.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  2589.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  2590.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  2591.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  2592.         return buf_size;

  2593.     /* skip everything if we are in a hurry>=5 */

  2594.     if(avctx->hurry_up>=5) return -1;//buf_size;

  2595. 

  2596.     if(s->next_p_frame_damaged){

  2597.         if(s->pict_type==B_TYPE)

  2598.             return buf_size;

  2599.         else

  2600.             s->next_p_frame_damaged=0;

  2601.     }

  2602. 

  2603.     if(MPV_frame_start(s, avctx) < 0)

  2604.         return -1;

  2605. 

  2606.     ff_er_frame_start(s);

  2607. 

  2608.     v->bits = buf_size * 8;

  2609.     vc1_decode_blocks(v);

  2610. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  2611. //  if(get_bits_count(&s->gb) > buf_size * 8)

  2612. //      return -1;

  2613.     ff_er_frame_end(s);

  2614. 

  2615.     MPV_frame_end(s);

  2616. 

  2617. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  2618. assert(s->current_picture.pict_type == s->pict_type);

  2619.     if (s->pict_type == B_TYPE || s->low_delay) {

  2620.         *pict= *(AVFrame*)s->current_picture_ptr;

  2621.     } else if (s->last_picture_ptr != NULL) {

  2622.         *pict= *(AVFrame*)s->last_picture_ptr;

  2623.     }

  2624. 

  2625.     if(s->last_picture_ptr || s->low_delay){

  2626.         *data_size = sizeof(AVFrame);

  2627.         ff_print_debug_info(s, pict);

  2628.     }

  2629. 

  2630.     /* Return the Picture timestamp as the frame number */

  2631.     /* we substract 1 because it is added on utils.c    */

  2632.     avctx->frame_number = s->picture_number - 1;

  2633. 

  2634.     return buf_size;

  2635. }

  2636. 

  2637. 

  2638. /** Close a VC1/WMV3 decoder

  2639.  * @warning Initial try at using MpegEncContext stuff

  2640.  */

  2641. static int vc1_decode_end(AVCodecContext *avctx)

  2642. {

  2643.     VC1Context *v = avctx->priv_data;

  2644. 

  2645.     av_freep(&v->hrd_rate);

  2646.     av_freep(&v->hrd_buffer);

  2647.     MPV_common_end(&v->s);

  2648.     av_freep(&v->mv_type_mb_plane);

  2649.     av_freep(&v->skip_mb_plane);

  2650.     return 0;

  2651. }

  2652. 

  2653. 

  2654. AVCodec vc1_decoder = {

  2655.     "vc1",

  2656.     CODEC_TYPE_VIDEO,

  2657.     CODEC_ID_VC1,

  2658.     sizeof(VC1Context),

  2659.     vc1_decode_init,

  2660.     NULL,

  2661.     vc1_decode_end,

  2662.     vc1_decode_frame,

  2663.     CODEC_CAP_DELAY,

  2664.     NULL

  2665. };

  2666. 

  2667. AVCodec wmv3_decoder = {

  2668.     "wmv3",

  2669.     CODEC_TYPE_VIDEO,

  2670.     CODEC_ID_WMV3,

  2671.     sizeof(VC1Context),

  2672.     vc1_decode_init,

  2673.     NULL,

  2674.     vc1_decode_end,

  2675.     vc1_decode_frame,

  2676.     CODEC_CAP_DELAY,

  2677.     NULL

  2678. };