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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.     uint8_t *mb_type_base, *mb_type[3];

  292. 

  293. 

  294.     /** Luma compensation parameters */

  295.     //@{

  296.     uint8_t lumscale;

  297.     uint8_t lumshift;

  298.     //@}

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

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

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

  302.     int buffer_fullness;  ///< HRD info

  303.     /** Ranges:

  304.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  305.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  306.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  307.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  308.      */

  309.     uint8_t mvrange;

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

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

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

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

  317. 

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

  319.     //@{

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

  321.     uint8_t interpfrm;

  322.     //@}

  323. 

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

  325.     //@{

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

  327.     uint8_t numpanscanwin;

  328.     uint8_t tfcntr;

  329.     uint8_t rptfrm, tff, rff;

  330.     uint16_t topleftx;

  331.     uint16_t toplefty;

  332.     uint16_t bottomrightx;

  333.     uint16_t bottomrighty;

  334.     uint8_t uvsamp;

  335.     uint8_t postproc;

  336.     int hrd_num_leaky_buckets;

  337.     uint8_t bit_rate_exponent;

  338.     uint8_t buffer_size_exponent;

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

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

  341.     uint8_t condover;

  342.     uint16_t *hrd_rate, *hrd_buffer;

  343.     uint8_t *hrd_fullness;

  344.     uint8_t range_mapy_flag;

  345.     uint8_t range_mapuv_flag;

  346.     uint8_t range_mapy;

  347.     uint8_t range_mapuv;

  348.     //@}

  349. } VC1Context;

  350. 

  351. /**

  352.  * Get unary code of limited length

  353.  * @fixme FIXME Slow and ugly

  354.  * @param gb GetBitContext

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

  356.  * @param[in] len Maximum length

  357.  * @return Unary length/index

  358.  */

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

  360. {

  361. #if 1

  362.     int i;

  363. 

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

  365.     return i;

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

  367. 

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

  369.   {

  370.     tmp = get_bits(gb, 1);

  371.     i++;

  372.   }

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

  374.   return i;*/

  375. #else

  376.   unsigned int buf;

  377.   int log;

  378. 

  379.   OPEN_READER(re, gb);

  380.   UPDATE_CACHE(re, gb);

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

  382.   if (stop) buf = ~buf;

  383. 

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

  385.   if (log < limit){

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

  387.     CLOSE_READER(re, gb);

  388.     return log;

  389.   }

  390. 

  391.   LAST_SKIP_BITS(re, gb, limit);

  392.   CLOSE_READER(re, gb);

  393.   return limit;

  394. #endif

  395. }

  396. 

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

  398.     int n;

  399.     n = get_bits1(gb);

  400.     if (n == 1)

  401.         return 0;

  402.     else

  403.         return 2 - get_bits1(gb);

  404. }

  405. 

  406. /**

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

  408.  * @param v The VC1Context to initialize

  409.  * @return Status

  410.  */

  411. static int vc1_init_common(VC1Context *v)

  412. {

  413.     static int done = 0;

  414.     int i = 0;

  415. 

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

  417. 

  418.     /* VLC tables */

  419.     if(!done)

  420.     {

  421.         done = 1;

  422.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  423.                  vc1_bfraction_bits, 1, 1,

  424.                  vc1_bfraction_codes, 1, 1, 1);

  425.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  426.                  vc1_norm2_bits, 1, 1,

  427.                  vc1_norm2_codes, 1, 1, 1);

  428.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  429.                  vc1_norm6_bits, 1, 1,

  430.                  vc1_norm6_codes, 2, 2, 1);

  431.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  432.                  vc1_imode_bits, 1, 1,

  433.                  vc1_imode_codes, 1, 1, 1);

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

  435.         {

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

  437.                      vc1_ttmb_bits[i], 1, 1,

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

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

  440.                      vc1_ttblk_bits[i], 1, 1,

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

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

  443.                      vc1_subblkpat_bits[i], 1, 1,

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

  445.         }

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

  447.         {

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

  449.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  452.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  455.                      vc1_mv_diff_bits[i], 1, 1,

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

  457.         }

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

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

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

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

  462.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  465.     }

  466. 

  467.     /* Other defaults */

  468.     v->pq = -1;

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

  470. 

  471.     return 0;

  472. }

  473. 

  474. /***********************************************************************/

  475. /**

  476.  * @defgroup bitplane VC9 Bitplane decoding

  477.  * @see 8.7, p56

  478.  * @{

  479.  */

  480. 

  481. /** @addtogroup bitplane

  482.  * Imode types

  483.  * @{

  484.  */

  485. enum Imode {

  486.     IMODE_RAW,

  487.     IMODE_NORM2,

  488.     IMODE_DIFF2,

  489.     IMODE_NORM6,

  490.     IMODE_DIFF6,

  491.     IMODE_ROWSKIP,

  492.     IMODE_COLSKIP

  493. };

  494. /** @} */ //imode defines

  495. 

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

  497.  * @param plane Buffer to store decoded bits

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

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

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

  501.  */

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

  503.     int x, y;

  504. 

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

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

  507.             memset(plane, 0, width);

  508.         else

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

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

  511.         plane += stride;

  512.     }

  513. }

  514. 

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

  516.  * @param plane Buffer to store decoded bits

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

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

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

  520.  * @fixme FIXME: Optimize

  521.  */

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

  523.     int x, y;

  524. 

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

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

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

  528.                 plane[y*stride] = 0;

  529.         else

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

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

  532.         plane ++;

  533.     }

  534. }

  535. 

  536. /** Decode a bitplane's bits

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

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

  539.  * @return Status

  540.  * @fixme FIXME: Optimize

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

  542.  */

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

  544. {

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

  546. 

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

  548.     uint8_t invert, *planep = data;

  549.     int width, height, stride;

  550. 

  551.     width = v->s.mb_width;

  552.     height = v->s.mb_height;

  553.     stride = v->s.mb_stride;

  554.     invert = get_bits(gb, 1);

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

  556. 

  557.     *raw_flag = 0;

  558.     switch (imode)

  559.     {

  560.     case IMODE_RAW:

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

  562.         *raw_flag = 1; //invert ignored

  563.         return invert;

  564.     case IMODE_DIFF2:

  565.     case IMODE_NORM2:

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

  567.         {

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

  569.             offset = 1;

  570.         }

  571.         else offset = 0;

  572.         // decode bitplane as one long line

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

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

  575.             *planep++ = code & 1;

  576.             offset++;

  577.             if(offset == width) {

  578.                 offset = 0;

  579.                 planep += stride - width;

  580.             }

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

  582.             offset++;

  583.             if(offset == width) {

  584.                 offset = 0;

  585.                 planep += stride - width;

  586.             }

  587.         }

  588.         break;

  589.     case IMODE_DIFF6:

  590.     case IMODE_NORM6:

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

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

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

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

  595.                     if(code < 0){

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

  597.                         return -1;

  598.                     }

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

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

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

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

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

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

  605.                 }

  606.                 planep += stride * 3;

  607.             }

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

  609.         } else { // 3x2

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

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

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

  613.                     if(code < 0){

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

  615.                         return -1;

  616.                     }

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

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

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

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

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

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

  623.                 }

  624.                 planep += stride * 2;

  625.             }

  626.             x = width % 3;

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

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

  629.         }

  630.         break;

  631.     case IMODE_ROWSKIP:

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

  633.         break;

  634.     case IMODE_COLSKIP:

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

  636.         break;

  637.     default: break;

  638.     }

  639. 

  640.     /* Applying diff operator */

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

  642.     {

  643.         planep = data;

  644.         planep[0] ^= invert;

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

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

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

  648.         {

  649.             planep += stride;

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

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

  652.             {

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

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

  655.             }

  656.         }

  657.     }

  658.     else if (invert)

  659.     {

  660.         planep = data;

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

  662.     }

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

  664. }

  665. 

  666. /** @} */ //Bitplane group

  667. 

  668. /***********************************************************************/

  669. /** VOP Dquant decoding

  670.  * @param v VC-1 Context

  671.  */

  672. static int vop_dquant_decoding(VC1Context *v)

  673. {

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

  675.     int pqdiff;

  676. 

  677.     //variable size

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

  679.     {

  680.         pqdiff = get_bits(gb, 3);

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

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

  683.     }

  684.     else

  685.     {

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

  687.         if ( v->dquantfrm )

  688.         {

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

  690.             switch (v->dqprofile)

  691.             {

  692.             case DQPROFILE_SINGLE_EDGE:

  693.             case DQPROFILE_DOUBLE_EDGES:

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

  695.                 break;

  696.             case DQPROFILE_ALL_MBS:

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

  698.             default: break; //Forbidden ?

  699.             }

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

  701.             {

  702.                 pqdiff = get_bits(gb, 3);

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

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

  705.             }

  706.         }

  707.     }

  708.     return 0;

  709. }

  710. 

  711. 

  712. /** Do inverse transform

  713.  */

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

  715. {

  716.     int i;

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

  718.     DCTELEM *src, *dst;

  719. 

  720.     src = block;

  721.     dst = block;

  722.     if(M==4){

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

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

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

  726.             t3 = 22 * src[1];

  727.             t4 = 22 * src[3];

  728.             t5 = 10 * src[1];

  729.             t6 = 10 * src[3];

  730. 

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

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

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

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

  735. 

  736.             src += 8;

  737.             dst += 8;

  738.         }

  739.     }else{

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

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

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

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

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

  745. 

  746.             t5 = t1 + t3;

  747.             t6 = t2 + t4;

  748.             t7 = t2 - t4;

  749.             t8 = t1 - t3;

  750. 

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

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

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

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

  755. 

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

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

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

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

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

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

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

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

  764. 

  765.             src += 8;

  766.             dst += 8;

  767.         }

  768.     }

  769. 

  770.     src = block;

  771.     dst = block;

  772.     if(N==4){

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

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

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

  776.             t3 = 22 * src[ 8];

  777.             t4 = 22 * src[24];

  778.             t5 = 10 * src[ 8];

  779.             t6 = 10 * src[24];

  780. 

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

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

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

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

  785. 

  786.             src ++;

  787.             dst ++;

  788.         }

  789.     }else{

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

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

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

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

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

  795. 

  796.             t5 = t1 + t3;

  797.             t6 = t2 + t4;

  798.             t7 = t2 - t4;

  799.             t8 = t1 - t3;

  800. 

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

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

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

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

  805. 

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

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

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

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

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

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

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

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

  814. 

  815.             src++;

  816.             dst++;

  817.         }

  818.     }

  819. }

  820. 

  821. /** Apply overlap transform

  822.  * @todo optimize

  823.  * @todo move to DSPContext

  824.  */

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

  826. {

  827.     int i;

  828. 

  829.     if(do_hor) { //TODO

  830.     }

  831.     if(do_vert) { //TODO

  832.     }

  833. 

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

  835.         block[i] += 128;

  836. }

  837. 

  838. 

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

  840. {

  841.     int i;

  842.     int a, b, c, d;

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

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

  845.         b = src[-stride];

  846.         c = src[0];

  847.         d = src[stride];

  848. 

  849.         src[-2*stride] = clip_uint8((7*a + d + 3) >> 3);

  850.         src[-stride] = clip_uint8((-a + 7*b + c + d + 3) >> 3);

  851.         src[0] = clip_uint8((a + b + 7*c - d + 3) >> 3);

  852.         src[stride] = clip_uint8((a + 7*d + 3) >> 3);

  853.         src++;

  854.     }

  855. }

  856. 

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

  858. {

  859.     int i;

  860.     int a, b, c, d;

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

  862.         a = src[-2];

  863.         b = src[-1];

  864.         c = src[0];

  865.         d = src[1];

  866. 

  867.         src[-2] = clip_uint8((7*a + d + 3) >> 3);

  868.         src[-1] = clip_uint8((-a + 7*b + c + d + 3) >> 3);

  869.         src[0] = clip_uint8((a + b + 7*c - d + 3) >> 3);

  870.         src[1] = clip_uint8((a + 7*d + 3) >> 3);

  871.         src += stride;

  872.     }

  873. }

  874. 

  875. /** Put block onto picture

  876.  * @todo move to DSPContext

  877.  */

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

  879. {

  880.     uint8_t *Y;

  881.     int ys, us, vs;

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

  883. 

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

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

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

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

  888. 

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

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

  891.     Y += ys * 8;

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

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

  894. 

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

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

  897. }

  898. 

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

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

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

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

  903. 

  904. /** Do motion compensation over 1 macroblock

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

  906.  */

  907. static void vc1_mc_1mv(VC1Context *v)

  908. {

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

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

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

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

  913. 

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

  915. 

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

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

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

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

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

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

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

  923. 

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

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

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

  927.     }

  928. 

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

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

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

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

  933. 

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

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

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

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

  938. 

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

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

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

  942. 

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

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

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

  946. 

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

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

  949.         srcY = s->edge_emu_buffer;

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

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

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

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

  954.         srcU = uvbuf;

  955.         srcV = uvbuf + 16;

  956.     }

  957. 

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

  959.         mx >>= 1;

  960.         my >>= 1;

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

  962.         uvdxy = 0;

  963. 

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

  965.     } else {

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

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

  968. 

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

  970.     }

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

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

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

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

  975. }

  976. 

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

  978.  */

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

  980. {

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

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

  983.     uint8_t *srcY;

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

  985.     int off;

  986. 

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

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

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

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

  991. 

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

  993. 

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

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

  996. 

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

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

  999. 

  1000.     srcY += src_y * s->linesize + src_x;

  1001. 

  1002.     if((unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1003.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1004.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 16+1, 16+1,

  1005.                             src_x, src_y, s->h_edge_pos, s->v_edge_pos);

  1006.         srcY = s->edge_emu_buffer;

  1007.     }

  1008. 

  1009.     if(!s->quarter_sample) { // hpel mc

  1010.         mx >>= 1;

  1011.         my >>= 1;

  1012.         dxy = ((my & 1) << 1) | (mx & 1);

  1013. 

  1014.         dsp->put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  1015.     } else {

  1016.         dxy = ((my & 3) << 2) | (mx & 3);

  1017. 

  1018.         dsp->put_no_rnd_qpel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize);

  1019.     }

  1020. }

  1021. 

  1022. #define SETMAXMIN(var)     \

  1023.     if(var > ma) ma = var; \

  1024.     if(var < mi) mi = var;

  1025. 

  1026. static inline int median4(int a, int b, int c, int d)

  1027. {

  1028.     int ma, mi;

  1029. 

  1030.     ma = mi = a;

  1031.     SETMAXMIN(b);

  1032.     SETMAXMIN(c);

  1033.     SETMAXMIN(d);

  1034. 

  1035.     return (a + b + c + d - ma - mi) >> 1;

  1036. }

  1037. 

  1038. 

  1039. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1040.  */

  1041. static void vc1_mc_4mv_chroma(VC1Context *v)

  1042. {

  1043.     MpegEncContext *s = &v->s;

  1044.     DSPContext *dsp = &v->s.dsp;

  1045.     uint8_t *srcU, *srcV;

  1046.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1047.     int i, idx, tx = 0, ty = 0;

  1048.     int mvx[4], mvy[4], intra[4];

  1049.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1050. 

  1051.     if(!v->s.last_picture.data[0])return;

  1052. 

  1053.     for(i = 0; i < 4; i++) {

  1054.         mvx[i] = s->mv[0][i][0];

  1055.         mvy[i] = s->mv[0][i][1];

  1056.         intra[i] = v->mb_type[0][s->block_index[i]];

  1057.     }

  1058. 

  1059.     /* calculate chroma MV vector from four luma MVs */

  1060.     idx = (intra[0] << 3) | (intra[1] << 2) | (intra[2] << 1) | intra[3];

  1061.     if(!idx) { // all blocks are inter

  1062.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1063.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1064.     } else if(count[idx] == 1) { // 3 inter blocks

  1065.         switch(idx) {

  1066.         case 0x1:

  1067.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1068.             tx = mid_pred(mvy[1], mvy[2], mvy[3]);

  1069.             break;

  1070.         case 0x2:

  1071.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1072.             tx = mid_pred(mvy[0], mvy[2], mvy[3]);

  1073.             break;

  1074.         case 0x4:

  1075.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1076.             tx = mid_pred(mvy[0], mvy[1], mvy[3]);

  1077.             break;

  1078.         case 0x8:

  1079.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1080.             tx = mid_pred(mvy[0], mvy[1], mvy[2]);

  1081.             break;

  1082.         }

  1083.     } else if(count[idx] == 2) {

  1084.         int t1 = 0, t2 = 0;

  1085.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1086.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1087.         tx = (mvx[t1] + mvx[t2]) >> 1;

  1088.         ty = (mvy[t1] + mvy[t2]) >> 1;

  1089.     } else

  1090.         return; //no need to do MC for inter blocks

  1091. 

  1092.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1093.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1094. 

  1095.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1096.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1097. 

  1098.     CLIP_RANGE(uvsrc_x, s->mb_x, s->mb_width  *  8,  8);

  1099.     CLIP_RANGE(uvsrc_y, s->mb_y, s->mb_height *  8,  8);

  1100.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1101.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1102.     if((unsigned)uvsrc_x > (s->h_edge_pos >> 1) - ((uvmx >> 1)&1) - 8

  1103.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - ((uvmy >> 1)&1) - 8){

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

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

  1106.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1107.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1108.         srcU = s->edge_emu_buffer;

  1109.         srcV = s->edge_emu_buffer + 16;

  1110.     }

  1111. 

  1112.     if(!s->quarter_sample) // hpel mc

  1113.         uvdxy = 0;

  1114.     else

  1115.         uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);

  1116.     dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize, 8);

  1117.     dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);

  1118. }

  1119. 

  1120. /**

  1121.  * Decode Simple/Main Profiles sequence header

  1122.  * @see Figure 7-8, p16-17

  1123.  * @param avctx Codec context

  1124.  * @param gb GetBit context initialized from Codec context extra_data

  1125.  * @return Status

  1126.  */

  1127. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1128. {

  1129.     VC1Context *v = avctx->priv_data;

  1130. 

  1131.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1132.     v->profile = get_bits(gb, 2);

  1133.     if (v->profile == 2)

  1134.     {

  1135.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1136.         return -1;

  1137.     }

  1138. 

  1139.     if (v->profile == PROFILE_ADVANCED)

  1140.     {

  1141.         v->level = get_bits(gb, 3);

  1142.         if(v->level >= 5)

  1143.         {

  1144.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1145.         }

  1146.         v->chromaformat = get_bits(gb, 2);

  1147.         if (v->chromaformat != 1)

  1148.         {

  1149.             av_log(avctx, AV_LOG_ERROR,

  1150.                    "Only 4:2:0 chroma format supported\n");

  1151.             return -1;

  1152.         }

  1153.     }

  1154.     else

  1155.     {

  1156.         v->res_sm = get_bits(gb, 2); //reserved

  1157.         if (v->res_sm)

  1158.         {

  1159.             av_log(avctx, AV_LOG_ERROR,

  1160.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1161.             return -1;

  1162.         }

  1163.     }

  1164. 

  1165.     // (fps-2)/4 (->30)

  1166.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1167.     // (bitrate-32kbps)/64kbps

  1168.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1169.     v->s.loop_filter = get_bits(gb, 1); //common

  1170.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1171.     {

  1172.         av_log(avctx, AV_LOG_ERROR,

  1173.                "LOOPFILTER shell not be enabled in simple profile\n");

  1174.     }

  1175. 

  1176.     if (v->profile < PROFILE_ADVANCED)

  1177.     {

  1178.         v->res_x8 = get_bits(gb, 1); //reserved

  1179.         if (v->res_x8)

  1180.         {

  1181.             av_log(avctx, AV_LOG_ERROR,

  1182.                    "1 for reserved RES_X8 is forbidden\n");

  1183.             //return -1;

  1184.         }

  1185.         v->multires = get_bits(gb, 1);

  1186.         v->res_fasttx = get_bits(gb, 1);

  1187.         if (!v->res_fasttx)

  1188.         {

  1189.             av_log(avctx, AV_LOG_ERROR,

  1190.                    "0 for reserved RES_FASTTX is forbidden\n");

  1191.             //return -1;

  1192.         }

  1193.     }

  1194. 

  1195.     v->fastuvmc =  get_bits(gb, 1); //common

  1196.     if (!v->profile && !v->fastuvmc)

  1197.     {

  1198.         av_log(avctx, AV_LOG_ERROR,

  1199.                "FASTUVMC unavailable in Simple Profile\n");

  1200.         return -1;

  1201.     }

  1202.     v->extended_mv =  get_bits(gb, 1); //common

  1203.     if (!v->profile && v->extended_mv)

  1204.     {

  1205.         av_log(avctx, AV_LOG_ERROR,

  1206.                "Extended MVs unavailable in Simple Profile\n");

  1207.         return -1;

  1208.     }

  1209.     v->dquant =  get_bits(gb, 2); //common

  1210.     v->vstransform =  get_bits(gb, 1); //common

  1211. 

  1212.     if (v->profile < PROFILE_ADVANCED)

  1213.     {

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

  1215.         if (v->res_transtab)

  1216.         {

  1217.             av_log(avctx, AV_LOG_ERROR,

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

  1219.             return -1;

  1220.         }

  1221.     }

  1222. 

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

  1224. 

  1225.     if (v->profile < PROFILE_ADVANCED)

  1226.     {

  1227.         v->s.resync_marker = get_bits(gb, 1);

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

  1229.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1230.         {

  1231.             av_log(avctx, AV_LOG_INFO,

  1232.                    "RANGERED should be set to 0 in simple profile\n");

  1233.         }

  1234.     }

  1235. 

  1236.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1237.     v->quantizer_mode = get_bits(gb, 2); //common

  1238. 

  1239.     if (v->profile < PROFILE_ADVANCED)

  1240.     {

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

  1242.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1243.         if (!v->res_rtm_flag)

  1244.         {

  1245.             av_log(avctx, AV_LOG_ERROR,

  1246.                    "0 for reserved RES_RTM_FLAG is forbidden\n");

  1247.             //return -1;

  1248.         }

  1249.         av_log(avctx, AV_LOG_DEBUG,

  1250.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1251.                "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"

  1252.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1253.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1254.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1255.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1256.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1257.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1258.                );

  1259.         return 0;

  1260.     }

  1261.     return -1;

  1262. }

  1263. 

  1264. 

  1265. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1266. {

  1267.     int pqindex, lowquant, status;

  1268. 

  1269.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1270.     skip_bits(gb, 2); //framecnt unused

  1271.     v->rangeredfrm = 0;

  1272.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1273.     v->s.pict_type = get_bits(gb, 1);

  1274.     if (v->s.avctx->max_b_frames) {

  1275.         if (!v->s.pict_type) {

  1276.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1277.             else v->s.pict_type = B_TYPE;

  1278.         } else v->s.pict_type = P_TYPE;

  1279.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1280. 

  1281.     if(v->s.pict_type == I_TYPE)

  1282.         get_bits(gb, 7); // skip buffer fullness

  1283. 

  1284.     /* Quantizer stuff */

  1285.     pqindex = get_bits(gb, 5);

  1286.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1287.         v->pq = pquant_table[0][pqindex];

  1288.     else

  1289.         v->pq = pquant_table[v->quantizer_mode-1][pqindex];

  1290. 

  1291.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1292.         v->pquantizer = pqindex < 9;

  1293.     if (v->quantizer_mode == QUANT_UNIFORM || v->quantizer_mode == QUANT_NON_UNIFORM)

  1294.         v->pquantizer = v->quantizer_mode == QUANT_UNIFORM;

  1295.     v->pqindex = pqindex;

  1296.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1297.     else v->halfpq = 0;

  1298.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1299.         v->pquantizer = get_bits(gb, 1);

  1300.     v->dquantfrm = 0;

  1301. 

  1302. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1303. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1304. 

  1305.     //TODO: complete parsing for P/B/BI frames

  1306.     switch(v->s.pict_type) {

  1307.     case P_TYPE:

  1308.         if (v->pq < 5) v->tt_index = 0;

  1309.         else if(v->pq < 13) v->tt_index = 1;

  1310.         else v->tt_index = 2;

  1311. 

  1312.         if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1313.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1314.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1315.         v->range_x = 1 << (v->k_x - 1);

  1316.         v->range_y = 1 << (v->k_y - 1);

  1317.         if (v->profile == PROFILE_ADVANCED)

  1318.         {

  1319.             if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1320.         }

  1321.         else

  1322.             if (v->multires) v->respic = get_bits(gb, 2);

  1323.         lowquant = (v->pq > 12) ? 0 : 1;

  1324.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1325.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1326.         {

  1327.             v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];

  1328.             v->lumscale = get_bits(gb, 6);

  1329.             v->lumshift = get_bits(gb, 6);

  1330.         }

  1331.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1332.             v->s.quarter_sample = 0;

  1333.         else

  1334.             v->s.quarter_sample = 1;

  1335. 

  1336.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1337.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1338.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1339.         {

  1340.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1341.             if (status < 0) return -1;

  1342.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1343.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1344.         } else {

  1345.             v->mv_type_is_raw = 0;

  1346.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1347.         }

  1348.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1349.         if (status < 0) return -1;

  1350.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1351.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1352. 

  1353.         /* Hopefully this is correct for P frames */

  1354.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1355.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1356. 

  1357.         if (v->dquant)

  1358.         {

  1359.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1360.             vop_dquant_decoding(v);

  1361.         }

  1362. 

  1363.         v->ttfrm = 0; //FIXME Is that so ?

  1364.         if (v->vstransform)

  1365.         {

  1366.             v->ttmbf = get_bits(gb, 1);

  1367.             if (v->ttmbf)

  1368.             {

  1369.                 v->ttfrm = get_bits(gb, 2);

  1370.             }

  1371.         }

  1372.         break;

  1373.     case B_TYPE:

  1374.         break;

  1375.     }

  1376. 

  1377.     /* AC Syntax */

  1378.     v->c_ac_table_index = decode012(gb);

  1379.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1380.     {

  1381.         v->y_ac_table_index = decode012(gb);

  1382.     }

  1383.     /* DC Syntax */

  1384.     v->s.dc_table_index = get_bits(gb, 1);

  1385. 

  1386.     return 0;

  1387. }

  1388. 

  1389. /***********************************************************************/

  1390. /**

  1391.  * @defgroup block VC-1 Block-level functions

  1392.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1393.  * @todo TODO: Integrate to MpegEncContext facilities

  1394.  * @{

  1395.  */

  1396. 

  1397. /**

  1398.  * @def GET_MQUANT

  1399.  * @brief Get macroblock-level quantizer scale

  1400.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1401.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1402.  */

  1403. #define GET_MQUANT()                                           \

  1404.   if (v->dquantfrm)                                            \

  1405.   {                                                            \

  1406.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1407.     {                                                          \

  1408.       if (v->dqbilevel)                                        \

  1409.       {                                                        \

  1410.         mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \

  1411.       }                                                        \

  1412.       else                                                     \

  1413.       {                                                        \

  1414.         mqdiff = get_bits(gb, 3);                              \

  1415.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1416.         else mquant = get_bits(gb, 5);                         \

  1417.       }                                                        \

  1418.     }                                                          \

  1419.     else if(v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1420.     {                                                          \

  1421.         switch(v->dqsbedge){                                   \

  1422.         case 0: /* left */                                     \

  1423.             mquant = (s->mb_x) ? v->pq : v->altpq;             \

  1424.             break;                                             \

  1425.         case 1: /* top */                                      \

  1426.             mquant = (s->mb_y) ? v->pq : v->altpq;             \

  1427.             break;                                             \

  1428.         case 2: /* right */                                    \

  1429.             mquant = (s->mb_x != (s->mb_width - 1)) ? v->pq : v->altpq; \

  1430.             break;                                             \

  1431.         case 3: /* bottom */                                   \

  1432.             mquant = (s->mb_y != (s->mb_height-1)) ? v->pq : v->altpq; \

  1433.             break;                                             \

  1434.         default:                                               \

  1435.             mquant = v->pq;                                    \

  1436.         }                                                      \

  1437.     }                                                          \

  1438.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1439.     {                                                          \

  1440.         switch(v->dqsbedge){                                   \

  1441.         case 0: /* left and top */                             \

  1442.             mquant = (s->mb_x && s->mb_y) ? v->pq : v->altpq;  \

  1443.             break;                                             \

  1444.         case 1: /* top and right */                            \

  1445.             mquant = (s->mb_y && s->mb_x != (s->mb_width - 1)) ? v->pq : v->altpq; \

  1446.             break;                                             \

  1447.         case 2: /* right and bottom */                         \

  1448.             mquant = (s->mb_x != (s->mb_width - 1) && s->mb_y != (s->mb_height-1)) ? v->pq : v->altpq; \

  1449.             break;                                             \

  1450.         case 3: /* bottom and left */                          \

  1451.             mquant = (s->mb_x && s->mb_y != (s->mb_height-1)) ? v->pq : v->altpq; \

  1452.             break;                                             \

  1453.         default:                                               \

  1454.             mquant = v->pq;                                    \

  1455.         }                                                      \

  1456.     }                                                          \

  1457.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1458.     {                                                          \

  1459.         mquant = (s->mb_x && s->mb_y && s->mb_x != (s->mb_width - 1) && s->mb_y != (s->mb_height-1)) ? v->pq : v->altpq; \

  1460.     }                                                          \

  1461.     else mquant = v->pq;                                       \

  1462.   }

  1463. 

  1464. /**

  1465.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1466.  * @brief Get MV differentials

  1467.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1468.  * @param _dmv_x Horizontal differential for decoded MV

  1469.  * @param _dmv_y Vertical differential for decoded MV

  1470.  * @todo TODO: Use MpegEncContext arrays to store them

  1471.  */

  1472. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1473.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1474.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1475.   if (index > 36)                                                   \

  1476.   {                                                                 \

  1477.     mb_has_coeffs = 1;                                              \

  1478.     index -= 37;                                                    \

  1479.   }                                                                 \

  1480.   else mb_has_coeffs = 0;                                           \

  1481.   s->mb_intra = 0;                                                  \

  1482.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1483.   else if (index == 35)                                             \

  1484.   {                                                                 \

  1485.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1486.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1487.   }                                                                 \

  1488.   else if (index == 36)                                             \

  1489.   {                                                                 \

  1490.     _dmv_x = 0;                                                     \

  1491.     _dmv_y = 0;                                                     \

  1492.     s->mb_intra = 1;                                                \

  1493.   }                                                                 \

  1494.   else                                                              \

  1495.   {                                                                 \

  1496.     index1 = index%6;                                               \

  1497.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1498.     else                                   val = 0;                 \

  1499.     if(size_table[index1] - val > 0)                                \

  1500.         val = get_bits(gb, size_table[index1] - val);               \

  1501.     else                                   val = 0;                 \

  1502.     sign = 0 - (val&1);                                             \

  1503.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1504.                                                                     \

  1505.     index1 = index/6;                                               \

  1506.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1507.     else                                   val = 0;                 \

  1508.     if(size_table[index1] - val > 0)                                \

  1509.         val = get_bits(gb, size_table[index1] - val);               \

  1510.     else                                   val = 0;                 \

  1511.     sign = 0 - (val&1);                                             \

  1512.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1513.   }

  1514. 

  1515. /** Predict and set motion vector

  1516.  */

  1517. static inline void vc1_pred_mv(MpegEncContext *s, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t* is_intra)

  1518. {

  1519.     int xy, wrap, off = 0;

  1520.     int16_t *A, *B, *C;

  1521.     int px, py;

  1522.     int sum;

  1523. 

  1524.     /* scale MV difference to be quad-pel */

  1525.     dmv_x <<= 1 - s->quarter_sample;

  1526.     dmv_y <<= 1 - s->quarter_sample;

  1527. 

  1528.     wrap = s->b8_stride;

  1529.     xy = s->block_index[n];

  1530. 

  1531.     if(s->mb_intra){

  1532.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1533.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1534.         if(mv1) { /* duplicate motion data for 1-MV block */

  1535.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1536.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1537.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1538.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1539.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1540.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1541.         }

  1542.         return;

  1543.     }

  1544. 

  1545.     C = s->current_picture.motion_val[0][xy - 1];

  1546.     A = s->current_picture.motion_val[0][xy - wrap];

  1547.     if(mv1)

  1548.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1549.     else {

  1550.         //in 4-MV mode different blocks have different B predictor position

  1551.         switch(n){

  1552.         case 0:

  1553.             off = (s->mb_x > 0) ? -1 : 1;

  1554.             break;

  1555.         case 1:

  1556.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1557.             break;

  1558.         case 2:

  1559.             off = 1;

  1560.             break;

  1561.         case 3:

  1562.             off = -1;

  1563.         }

  1564.     }

  1565.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1566. 

  1567.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1568.         if(s->mb_width == 1) {

  1569.             px = A[0];

  1570.             py = A[1];

  1571.         } else {

  1572.             px = mid_pred(A[0], B[0], C[0]);

  1573.             py = mid_pred(A[1], B[1], C[1]);

  1574.         }

  1575.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1576.         px = C[0];

  1577.         py = C[1];

  1578.     } else {

  1579.         px = py = 0;

  1580.     }

  1581.     /* Pullback MV as specified in 8.3.5.3.4 */

  1582.     {

  1583.         int qx, qy, X, Y;

  1584.         qx = s->mb_x << 6; //FIXME: add real block coords for 4MV mode

  1585.         qy = s->mb_y << 6;

  1586.         X = (s->mb_width << 6) - 4;

  1587.         Y = (s->mb_height << 6) - 4;

  1588.         if(mv1) {

  1589.             if(qx + px < -60) px = -60 - qx;

  1590.             if(qy + py < -60) py = -60 - qy;

  1591.         } else {

  1592.             if(qx + px < -28) px = -28 - qx;

  1593.             if(qy + py < -28) py = -28 - qy;

  1594.         }

  1595.         if(qx + px > X) px = X - qx;

  1596.         if(qy + py > Y) py = Y - qy;

  1597.     }

  1598.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1599.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1600.         if(is_intra[xy - wrap])

  1601.             sum = ABS(px) + ABS(py);

  1602.         else

  1603.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1604.         if(sum > 32) {

  1605.             if(get_bits1(&s->gb)) {

  1606.                 px = A[0];

  1607.                 py = A[1];

  1608.             } else {

  1609.                 px = C[0];

  1610.                 py = C[1];

  1611.             }

  1612.         } else {

  1613.             if(is_intra[xy - 1])

  1614.                 sum = ABS(px) + ABS(py);

  1615.             else

  1616.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1617.             if(sum > 32) {

  1618.                 if(get_bits1(&s->gb)) {

  1619.                     px = A[0];

  1620.                     py = A[1];

  1621.                 } else {

  1622.                     px = C[0];

  1623.                     py = C[1];

  1624.                 }

  1625.             }

  1626.         }

  1627.     }

  1628.     /* store MV using signed modulus of MV range defined in 4.11 */

  1629.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1630.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1631.     if(mv1) { /* duplicate motion data for 1-MV block */

  1632.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1633.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1634.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1635.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1636.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1637.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1638.     }

  1639. }

  1640. 

  1641. /** Get predicted DC value for I-frames only

  1642.  * prediction dir: left=0, top=1

  1643.  * @param s MpegEncContext

  1644.  * @param[in] n block index in the current MB

  1645.  * @param dc_val_ptr Pointer to DC predictor

  1646.  * @param dir_ptr Prediction direction for use in AC prediction

  1647.  */

  1648. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1649.                               int16_t **dc_val_ptr, int *dir_ptr)

  1650. {

  1651.     int a, b, c, wrap, pred, scale;

  1652.     int16_t *dc_val;

  1653.     static const uint16_t dcpred[32] = {

  1654.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1655.          114,  102,   93,   85,   79,   73,   68,   64,

  1656.           60,   57,   54,   51,   49,   47,   45,   43,

  1657.           41,   39,   38,   37,   35,   34,   33

  1658.     };

  1659. 

  1660.     /* find prediction - wmv3_dc_scale always used here in fact */

  1661.     if (n < 4)     scale = s->y_dc_scale;

  1662.     else           scale = s->c_dc_scale;

  1663. 

  1664.     wrap = s->block_wrap[n];

  1665.     dc_val= s->dc_val[0] + s->block_index[n];

  1666. 

  1667.     /* B A

  1668.      * C X

  1669.      */

  1670.     c = dc_val[ - 1];

  1671.     b = dc_val[ - 1 - wrap];

  1672.     a = dc_val[ - wrap];

  1673. 

  1674.     if (pq < 9 || !overlap)

  1675.     {

  1676.         /* Set outer values */

  1677.         if (!s->mb_y && (n!=2 && n!=3)) b=a=dcpred[scale];

  1678.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1679.     }

  1680.     else

  1681.     {

  1682.         /* Set outer values */

  1683.         if (!s->mb_y && (n!=2 && n!=3)) b=a=0;

  1684.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1685.     }

  1686. 

  1687.     if (abs(a - b) <= abs(b - c)) {

  1688.         pred = c;

  1689.         *dir_ptr = 1;//left

  1690.     } else {

  1691.         pred = a;

  1692.         *dir_ptr = 0;//top

  1693.     }

  1694. 

  1695.     /* update predictor */

  1696.     *dc_val_ptr = &dc_val[0];

  1697.     return pred;

  1698. }

  1699. 

  1700. 

  1701. /** Get predicted DC value

  1702.  * prediction dir: left=0, top=1

  1703.  * @param s MpegEncContext

  1704.  * @param[in] n block index in the current MB

  1705.  * @param dc_val_ptr Pointer to DC predictor

  1706.  * @param dir_ptr Prediction direction for use in AC prediction

  1707.  */

  1708. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1709.                               int a_avail, int c_avail,

  1710.                               int16_t **dc_val_ptr, int *dir_ptr)

  1711. {

  1712.     int a, b, c, wrap, pred, scale;

  1713.     int16_t *dc_val;

  1714.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1715.     int mb_pos2, q1, q2;

  1716. 

  1717.     /* find prediction - wmv3_dc_scale always used here in fact */

  1718.     if (n < 4)     scale = s->y_dc_scale;

  1719.     else           scale = s->c_dc_scale;

  1720. 

  1721.     wrap = s->block_wrap[n];

  1722.     dc_val= s->dc_val[0] + s->block_index[n];

  1723. 

  1724.     /* B A

  1725.      * C X

  1726.      */

  1727.     c = dc_val[ - 1];

  1728.     b = dc_val[ - 1 - wrap];

  1729.     a = dc_val[ - wrap];

  1730. 

  1731.     if(a_avail && c_avail) {

  1732.         if(abs(a - b) <= abs(b - c)) {

  1733.             pred = c;

  1734.             *dir_ptr = 1;//left

  1735.         } else {

  1736.             pred = a;

  1737.             *dir_ptr = 0;//top

  1738.         }

  1739.     } else if(a_avail) {

  1740.         pred = a;

  1741.         *dir_ptr = 0;//top

  1742.     } else if(c_avail) {

  1743.         pred = c;

  1744.         *dir_ptr = 1;//left

  1745.     } else {

  1746.         pred = 0;

  1747.         *dir_ptr = 1;//left

  1748.     }

  1749. 

  1750.     /* scale coeffs if needed

  1751.     mb_pos2 = mb_pos - *dir_ptr - (1 - *dir_ptr) * s->mb_stride;

  1752.     q1 = s->y_dc_scale_table[s->current_picture.qscale_table[mb_pos]];

  1753.     q2 = s->y_dc_scale_table[s->current_picture.qscale_table[mb_pos2]];

  1754.     if(q2 && q1!=q2 && ((*dir_ptr && c_avail) || (!*dir_ptr && a_avail))) {

  1755.         pred = (pred * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1756.     } */

  1757. 

  1758.     /* update predictor */

  1759.     *dc_val_ptr = &dc_val[0];

  1760.     return pred;

  1761. }

  1762. 

  1763. 

  1764. /**

  1765.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1766.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1767.  * @todo TODO: Integrate to MpegEncContext facilities

  1768.  * @{

  1769.  */

  1770. 

  1771. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1772. {

  1773.     int xy, wrap, pred, a, b, c;

  1774. 

  1775.     xy = s->block_index[n];

  1776.     wrap = s->b8_stride;

  1777. 

  1778.     /* B C

  1779.      * A X

  1780.      */

  1781.     a = s->coded_block[xy - 1       ];

  1782.     b = s->coded_block[xy - 1 - wrap];

  1783.     c = s->coded_block[xy     - wrap];

  1784. 

  1785.     if (b == c) {

  1786.         pred = a;

  1787.     } else {

  1788.         pred = c;

  1789.     }

  1790. 

  1791.     /* store value */

  1792.     *coded_block_ptr = &s->coded_block[xy];

  1793. 

  1794.     return pred;

  1795. }

  1796. 

  1797. /**

  1798.  * Decode one AC coefficient

  1799.  * @param v The VC1 context

  1800.  * @param last Last coefficient

  1801.  * @param skip How much zero coefficients to skip

  1802.  * @param value Decoded AC coefficient value

  1803.  * @see 8.1.3.4

  1804.  */

  1805. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1806. {

  1807.     GetBitContext *gb = &v->s.gb;

  1808.     int index, escape, run = 0, level = 0, lst = 0;

  1809. 

  1810.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1811.     if (index != vc1_ac_sizes[codingset] - 1) {

  1812.         run = vc1_index_decode_table[codingset][index][0];

  1813.         level = vc1_index_decode_table[codingset][index][1];

  1814.         lst = index >= vc1_last_decode_table[codingset];

  1815.         if(get_bits(gb, 1))

  1816.             level = -level;

  1817.     } else {

  1818.         escape = decode210(gb);

  1819.         if (escape != 2) {

  1820.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1821.             run = vc1_index_decode_table[codingset][index][0];

  1822.             level = vc1_index_decode_table[codingset][index][1];

  1823.             lst = index >= vc1_last_decode_table[codingset];

  1824.             if(escape == 0) {

  1825.                 if(lst)

  1826.                     level += vc1_last_delta_level_table[codingset][run];

  1827.                 else

  1828.                     level += vc1_delta_level_table[codingset][run];

  1829.             } else {

  1830.                 if(lst)

  1831.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  1832.                 else

  1833.                     run += vc1_delta_run_table[codingset][level] + 1;

  1834.             }

  1835.             if(get_bits(gb, 1))

  1836.                 level = -level;

  1837.         } else {

  1838.             int sign;

  1839.             lst = get_bits(gb, 1);

  1840.             if(v->s.esc3_level_length == 0) {

  1841.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1842.                     v->s.esc3_level_length = get_bits(gb, 3);

  1843.                     if(!v->s.esc3_level_length)

  1844.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1845.                 } else { //table 60

  1846.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1847.                 }

  1848.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1849.             }

  1850.             run = get_bits(gb, v->s.esc3_run_length);

  1851.             sign = get_bits(gb, 1);

  1852.             level = get_bits(gb, v->s.esc3_level_length);

  1853.             if(sign)

  1854.                 level = -level;

  1855.         }

  1856.     }

  1857. 

  1858.     *last = lst;

  1859.     *skip = run;

  1860.     *value = level;

  1861. }

  1862. 

  1863. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1864.  * @param v VC1Context

  1865.  * @param block block to decode

  1866.  * @param coded are AC coeffs present or not

  1867.  * @param codingset set of VLC to decode data

  1868.  */

  1869. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1870. {

  1871.     GetBitContext *gb = &v->s.gb;

  1872.     MpegEncContext *s = &v->s;

  1873.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1874.     int run_diff, i;

  1875.     int16_t *dc_val;

  1876.     int16_t *ac_val, *ac_val2;

  1877.     int dcdiff;

  1878. 

  1879.     /* Get DC differential */

  1880.     if (n < 4) {

  1881.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1882.     } else {

  1883.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1884.     }

  1885.     if (dcdiff < 0){

  1886.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1887.         return -1;

  1888.     }

  1889.     if (dcdiff)

  1890.     {

  1891.         if (dcdiff == 119 /* ESC index value */)

  1892.         {

  1893.             /* TODO: Optimize */

  1894.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1895.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1896.             else dcdiff = get_bits(gb, 8);

  1897.         }

  1898.         else

  1899.         {

  1900.             if (v->pq == 1)

  1901.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1902.             else if (v->pq == 2)

  1903.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1904.         }

  1905.         if (get_bits(gb, 1))

  1906.             dcdiff = -dcdiff;

  1907.     }

  1908. 

  1909.     /* Prediction */

  1910.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1911.     *dc_val = dcdiff;

  1912. 

  1913.     /* Store the quantized DC coeff, used for prediction */

  1914.     if (n < 4) {

  1915.         block[0] = dcdiff * s->y_dc_scale;

  1916.     } else {

  1917.         block[0] = dcdiff * s->c_dc_scale;

  1918.     }

  1919.     /* Skip ? */

  1920.     run_diff = 0;

  1921.     i = 0;

  1922.     if (!coded) {

  1923.         goto not_coded;

  1924.     }

  1925. 

  1926.     //AC Decoding

  1927.     i = 1;

  1928. 

  1929.     {

  1930.         int last = 0, skip, value;

  1931.         const int8_t *zz_table;

  1932.         int scale;

  1933.         int k;

  1934. 

  1935.         scale = v->pq * 2 + v->halfpq;

  1936. 

  1937.         if(v->s.ac_pred) {

  1938.             if(!dc_pred_dir)

  1939.                 zz_table = vc1_horizontal_zz;

  1940.             else

  1941.                 zz_table = vc1_vertical_zz;

  1942.         } else

  1943.             zz_table = vc1_normal_zz;

  1944. 

  1945.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1946.         ac_val2 = ac_val;

  1947.         if(dc_pred_dir) //left

  1948.             ac_val -= 16;

  1949.         else //top

  1950.             ac_val -= 16 * s->block_wrap[n];

  1951. 

  1952.         while (!last) {

  1953.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1954.             i += skip;

  1955.             if(i > 63)

  1956.                 break;

  1957.             block[zz_table[i++]] = value;

  1958.         }

  1959. 

  1960.         /* apply AC prediction if needed */

  1961.         if(s->ac_pred) {

  1962.             if(dc_pred_dir) { //left

  1963.                 for(k = 1; k < 8; k++)

  1964.                     block[k << 3] += ac_val[k];

  1965.             } else { //top

  1966.                 for(k = 1; k < 8; k++)

  1967.                     block[k] += ac_val[k + 8];

  1968.             }

  1969.         }

  1970.         /* save AC coeffs for further prediction */

  1971.         for(k = 1; k < 8; k++) {

  1972.             ac_val2[k] = block[k << 3];

  1973.             ac_val2[k + 8] = block[k];

  1974.         }

  1975. 

  1976.         /* scale AC coeffs */

  1977.         for(k = 1; k < 64; k++)

  1978.             if(block[k]) {

  1979.                 block[k] *= scale;

  1980.                 if(!v->pquantizer)

  1981.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1982.             }

  1983. 

  1984.         if(s->ac_pred) i = 63;

  1985.     }

  1986. 

  1987. not_coded:

  1988.     if(!coded) {

  1989.         int k, scale;

  1990.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1991.         ac_val2 = ac_val;

  1992. 

  1993.         scale = v->pq * 2 + v->halfpq;

  1994.         memset(ac_val2, 0, 16 * 2);

  1995.         if(dc_pred_dir) {//left

  1996.             ac_val -= 16;

  1997.             if(s->ac_pred)

  1998.                 memcpy(ac_val2, ac_val, 8 * 2);

  1999.         } else {//top

  2000.             ac_val -= 16 * s->block_wrap[n];

  2001.             if(s->ac_pred)

  2002.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2003.         }

  2004. 

  2005.         /* apply AC prediction if needed */

  2006.         if(s->ac_pred) {

  2007.             if(dc_pred_dir) { //left

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

  2009.                     block[k << 3] = ac_val[k] * scale;

  2010.                     if(!v->pquantizer)

  2011.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2012.                 }

  2013.             } else { //top

  2014.                 for(k = 1; k < 8; k++) {

  2015.                     block[k] = ac_val[k + 8] * scale;

  2016.                     if(!v->pquantizer)

  2017.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2018.                 }

  2019.             }

  2020.             i = 63;

  2021.         }

  2022.     }

  2023.     s->block_last_index[n] = i;

  2024. 

  2025.     return 0;

  2026. }

  2027. 

  2028. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2029.  * @param v VC1Context

  2030.  * @param block block to decode

  2031.  * @param coded are AC coeffs present or not

  2032.  * @param mquant block quantizer

  2033.  * @param codingset set of VLC to decode data

  2034.  */

  2035. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2036. {

  2037.     GetBitContext *gb = &v->s.gb;

  2038.     MpegEncContext *s = &v->s;

  2039.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2040.     int run_diff, i;

  2041.     int16_t *dc_val;

  2042.     int16_t *ac_val, *ac_val2;

  2043.     int dcdiff;

  2044.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2045.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2046. 

  2047.     /* XXX: Guard against dumb values of mquant */

  2048.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2049. 

  2050.     /* Set DC scale - y and c use the same */

  2051.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2052.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2053. 

  2054.     /* Get DC differential */

  2055.     if (n < 4) {

  2056.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2057.     } else {

  2058.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2059.     }

  2060.     if (dcdiff < 0){

  2061.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2062.         return -1;

  2063.     }

  2064.     if (dcdiff)

  2065.     {

  2066.         if (dcdiff == 119 /* ESC index value */)

  2067.         {

  2068.             /* TODO: Optimize */

  2069.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2070.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2071.             else dcdiff = get_bits(gb, 8);

  2072.         }

  2073.         else

  2074.         {

  2075.             if (mquant == 1)

  2076.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2077.             else if (mquant == 2)

  2078.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2079.         }

  2080.         if (get_bits(gb, 1))

  2081.             dcdiff = -dcdiff;

  2082.     }

  2083. 

  2084.     /* Prediction */

  2085.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2086.     *dc_val = dcdiff;

  2087. 

  2088.     /* Store the quantized DC coeff, used for prediction */

  2089. 

  2090.     if (n < 4) {

  2091.         block[0] = dcdiff * s->y_dc_scale;

  2092.     } else {

  2093.         block[0] = dcdiff * s->c_dc_scale;

  2094.     }

  2095.     /* Skip ? */

  2096.     run_diff = 0;

  2097.     i = 0;

  2098.     if (!coded) {

  2099.         goto not_coded;

  2100.     }

  2101. 

  2102.     //AC Decoding

  2103.     i = 1;

  2104. 

  2105.     {

  2106.         int last = 0, skip, value;

  2107.         const int8_t *zz_table;

  2108.         int scale;

  2109.         int k;

  2110.         int use_pred = s->ac_pred;

  2111. 

  2112.         scale = mquant * 2;

  2113. 

  2114.         zz_table = vc1_simple_progressive_8x8_zz;

  2115. 

  2116.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2117.         ac_val2 = ac_val;

  2118.         if(!a_avail) dc_pred_dir = 1;

  2119.         if(!c_avail) dc_pred_dir = 0;

  2120.         if(!a_avail && !c_avail) use_pred = 0;

  2121. 

  2122.         if(dc_pred_dir) //left

  2123.             ac_val -= 16;

  2124.         else //top

  2125.             ac_val -= 16 * s->block_wrap[n];

  2126. 

  2127.         while (!last) {

  2128.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2129.             i += skip;

  2130.             if(i > 63)

  2131.                 break;

  2132.             block[zz_table[i++]] = value;

  2133.         }

  2134. 

  2135.         /* apply AC prediction if needed */

  2136.         if(use_pred) {

  2137.             /* scale predictors if needed*/

  2138.             int mb_pos2, q1, q2;

  2139. 

  2140.             mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  2141.             q1 = s->current_picture.qscale_table[mb_pos];

  2142.             q2 = s->current_picture.qscale_table[mb_pos2];

  2143. 

  2144.             if(0 && q2 && q1!=q2 && ((dc_pred_dir && c_avail) || (!dc_pred_dir && a_avail))) {

  2145.                 q1 = q1 * 2 - 1;

  2146.                 q2 = q2 * 2 - 1;

  2147. 

  2148.                 if(dc_pred_dir) { //left

  2149.                     for(k = 1; k < 8; k++)

  2150.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2151.                 } else { //top

  2152.                     for(k = 1; k < 8; k++)

  2153.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2154.                 }

  2155.             } else {

  2156.                 if(dc_pred_dir) { //left

  2157.                     for(k = 1; k < 8; k++)

  2158.                         block[k << 3] += ac_val[k];

  2159.                 } else { //top

  2160.                     for(k = 1; k < 8; k++)

  2161.                         block[k] += ac_val[k + 8];

  2162.                 }

  2163.             }

  2164.         }

  2165.         /* save AC coeffs for further prediction */

  2166.         for(k = 1; k < 8; k++) {

  2167.             ac_val2[k] = block[k << 3];

  2168.             ac_val2[k + 8] = block[k];

  2169.         }

  2170. 

  2171.         /* scale AC coeffs */

  2172.         for(k = 1; k < 64; k++)

  2173.             if(block[k]) {

  2174.                 block[k] *= scale;

  2175.                 if(!v->pquantizer)

  2176.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2177.             }

  2178. 

  2179.         if(use_pred) i = 63;

  2180.     }

  2181. 

  2182. not_coded:

  2183.     if(!coded) {

  2184.         int k, scale;

  2185.         int use_pred = s->ac_pred;

  2186.         int mb_pos2, q1, q2;

  2187. 

  2188.         mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  2189.         q1 = s->current_picture.qscale_table[mb_pos];

  2190.         q2 = s->current_picture.qscale_table[mb_pos2];

  2191. 

  2192.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2193.         ac_val2 = ac_val;

  2194. 

  2195.         if(!c_avail) {

  2196.             memset(ac_val, 0, 8 * sizeof(ac_val[0]));

  2197.             dc_pred_dir = 0;

  2198.         }

  2199.         if(!a_avail) {

  2200.             memset(ac_val + 8, 0, 8 * sizeof(ac_val[0]));

  2201.             dc_pred_dir = 1;

  2202.         }

  2203. 

  2204.         if(!a_avail && !c_avail) use_pred = 0;

  2205. 

  2206.         scale = mquant * 2;

  2207.         memset(ac_val2, 0, 16 * 2);

  2208.         if(dc_pred_dir) {//left

  2209.             ac_val -= 16;

  2210.             if(use_pred) {

  2211.                 memcpy(ac_val2, ac_val, 8 * 2);

  2212.                 if(0 && q2 && q1!=q2 && c_avail) {

  2213.                     q1 = q1 * 2 - 1;

  2214.                     q2 = q2 * 2 - 1;

  2215.                     for(k = 1; k < 8; k++)

  2216.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2217.                 }

  2218.             }

  2219.         } else {//top

  2220.             ac_val -= 16 * s->block_wrap[n];

  2221.             if(use_pred) {

  2222.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2223.                 if(0 && q2 && q1!=q2 && a_avail) {

  2224.                     q1 = q1 * 2 - 1;

  2225.                     q2 = q2 * 2 - 1;

  2226.                     for(k = 1; k < 8; k++)

  2227.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2228.                 }

  2229.             }

  2230.         }

  2231. 

  2232.         /* apply AC prediction if needed */

  2233.         if(use_pred) {

  2234.             if(dc_pred_dir) { //left

  2235.                 for(k = 1; k < 8; k++) {

  2236.                     block[k << 3] = ac_val2[k] * scale;

  2237.                     if(!v->pquantizer)

  2238.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2239.                 }

  2240.             } else { //top

  2241.                 for(k = 1; k < 8; k++) {

  2242.                     block[k] = ac_val2[k + 8] * scale;

  2243.                     if(!v->pquantizer)

  2244.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2245.                 }

  2246.             }

  2247.             i = 63;

  2248.         }

  2249.     }

  2250.     s->block_last_index[n] = i;

  2251. 

  2252.     return 0;

  2253. }

  2254. 

  2255. /** Decode P block

  2256.  */

  2257. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2258. {

  2259.     MpegEncContext *s = &v->s;

  2260.     GetBitContext *gb = &s->gb;

  2261.     int i, j;

  2262.     int subblkpat = 0;

  2263.     int scale, off, idx, last, skip, value;

  2264.     int ttblk = ttmb & 7;

  2265. 

  2266.     if(ttmb == -1) {

  2267.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2268.     }

  2269.     if(ttblk == TT_4X4) {

  2270.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2271.     }

  2272.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2273.         subblkpat = decode012(gb);

  2274.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2275.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2276.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2277.     }

  2278.     scale = 2 * mquant;

  2279. 

  2280.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2281.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2282.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2283.         ttblk = TT_8X4;

  2284.     }

  2285.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2286.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2287.         ttblk = TT_4X8;

  2288.     }

  2289.     switch(ttblk) {

  2290.     case TT_8X8:

  2291.         i = 0;

  2292.         last = 0;

  2293.         while (!last) {

  2294.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2295.             i += skip;

  2296.             if(i > 63)

  2297.                 break;

  2298.             idx = vc1_simple_progressive_8x8_zz[i++];

  2299.             block[idx] = value * scale;

  2300.         }

  2301.         vc1_inv_trans(block, 8, 8);

  2302.         break;

  2303.     case TT_4X4:

  2304.         for(j = 0; j < 4; j++) {

  2305.             last = subblkpat & (1 << (3 - j));

  2306.             i = 0;

  2307.             off = (j & 1) * 4 + (j & 2) * 16;

  2308.             while (!last) {

  2309.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2310.                 i += skip;

  2311.                 if(i > 15)

  2312.                     break;

  2313.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2314.                 block[idx + off] = value * scale;

  2315.             }

  2316.             if(!(subblkpat & (1 << (3 - j))))

  2317.                 vc1_inv_trans(block + off, 4, 4);

  2318.         }

  2319.         break;

  2320.     case TT_8X4:

  2321.         for(j = 0; j < 2; j++) {

  2322.             last = subblkpat & (1 << (1 - j));

  2323.             i = 0;

  2324.             off = j * 32;

  2325.             while (!last) {

  2326.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2327.                 i += skip;

  2328.                 if(i > 31)

  2329.                     break;

  2330.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2331.                 block[idx + off] = value * scale;

  2332.             }

  2333.             if(!(subblkpat & (1 << (1 - j))))

  2334.                 vc1_inv_trans(block + off, 8, 4);

  2335.         }

  2336.         break;

  2337.     case TT_4X8:

  2338.         for(j = 0; j < 2; j++) {

  2339.             last = subblkpat & (1 << (1 - j));

  2340.             i = 0;

  2341.             off = j * 4;

  2342.             while (!last) {

  2343.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2344.                 i += skip;

  2345.                 if(i > 31)

  2346.                     break;

  2347.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2348.                 block[idx + off] = value * scale;

  2349.             }

  2350.             if(!(subblkpat & (1 << (1 - j))))

  2351.                 vc1_inv_trans(block + off, 4, 8);

  2352.         }

  2353.         break;

  2354.     }

  2355.     return 0;

  2356. }

  2357. 

  2358. 

  2359. /** Decode one P-frame MB (in Simple/Main profile)

  2360.  * @todo TODO: Extend to AP

  2361.  * @fixme FIXME: DC value for inter blocks not set

  2362.  */

  2363. static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])

  2364. {

  2365.     MpegEncContext *s = &v->s;

  2366.     GetBitContext *gb = &s->gb;

  2367.     int i, j;

  2368.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2369.     int cbp; /* cbp decoding stuff */

  2370.     int mqdiff, mquant; /* MB quantization */

  2371.     int ttmb = v->ttmb; /* MB Transform type */

  2372.     int status;

  2373. 

  2374.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2375.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2376.     int mb_has_coeffs = 1; /* last_flag */

  2377.     int dmv_x, dmv_y; /* Differential MV components */

  2378.     int index, index1; /* LUT indices */

  2379.     int val, sign; /* temp values */

  2380.     int first_block = 1;

  2381.     int dst_idx, off;

  2382.     int skipped, fourmv;

  2383. 

  2384.     mquant = v->pq; /* Loosy initialization */

  2385. 

  2386.     if (v->mv_type_is_raw)

  2387.         fourmv = get_bits1(gb);

  2388.     else

  2389.         fourmv = v->mv_type_mb_plane[mb_pos];

  2390.     if (v->skip_is_raw)

  2391.         skipped = get_bits1(gb);

  2392.     else

  2393.         skipped = v->s.mbskip_table[mb_pos];

  2394. 

  2395.     s->dsp.clear_blocks(s->block[0]);

  2396. 

  2397.     if (!fourmv) /* 1MV mode */

  2398.     {

  2399.         if (!skipped)

  2400.         {

  2401.             GET_MVDATA(dmv_x, dmv_y);

  2402. 

  2403.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2404.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  2405. 

  2406.             /* FIXME Set DC val for inter block ? */

  2407.             if (s->mb_intra && !mb_has_coeffs)

  2408.             {

  2409.                 GET_MQUANT();

  2410.                 s->ac_pred = get_bits(gb, 1);

  2411.                 cbp = 0;

  2412.             }

  2413.             else if (mb_has_coeffs)

  2414.             {

  2415.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2416.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2417.                 GET_MQUANT();

  2418.             }

  2419.             else

  2420.             {

  2421.                 mquant = v->pq;

  2422.                 cbp = 0;

  2423.             }

  2424.             s->current_picture.qscale_table[mb_pos] = mquant;

  2425. 

  2426.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2427.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2428.                                 VC1_TTMB_VLC_BITS, 2);

  2429.             if(!s->mb_intra) vc1_mc_1mv(v);

  2430.             dst_idx = 0;

  2431.             for (i=0; i<6; i++)

  2432.             {

  2433.                 s->dc_val[0][s->block_index[i]] = 0;

  2434.                 dst_idx += i >> 2;

  2435.                 val = ((cbp >> (5 - i)) & 1);

  2436.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2437.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2438.                 if(s->mb_intra) {

  2439.                     /* check if prediction blocks A and C are available */

  2440.                     v->a_avail = v->c_avail = 0;

  2441.                     if(i == 2 || i == 3 || s->mb_y)

  2442.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2443.                     if(i == 1 || i == 3 || s->mb_x)

  2444.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2445. 

  2446.                     vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2447.                     vc1_inv_trans(block[i], 8, 8);

  2448.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2449.                     s->dsp.put_pixels_clamped(block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2450.                     /* TODO: proper loop filtering */

  2451.                     if(v->pq >= 9 && v->overlap) {

  2452.                         if(v->a_avail)

  2453.                             s->dsp.h263_v_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2454.                         if(v->c_avail)

  2455.                             s->dsp.h263_h_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2456.                     }

  2457.                 } else if(val) {

  2458.                     vc1_decode_p_block(v, block[i], i, mquant, ttmb, first_block);

  2459.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2460.                     first_block = 0;

  2461.                     s->dsp.add_pixels_clamped(block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2462.                 }

  2463.             }

  2464.         }

  2465.         else //Skipped

  2466.         {

  2467.             s->mb_intra = 0;

  2468.             for(i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2469.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2470.             s->current_picture.qscale_table[mb_pos] = 0;

  2471.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  2472.             vc1_mc_1mv(v);

  2473.             return 0;

  2474.         }

  2475.     } //1MV mode

  2476.     else //4MV mode

  2477.     {

  2478.         if (!skipped /* unskipped MB */)

  2479.         {

  2480.             int intra_count = 0, coded_inter = 0;

  2481.             int is_intra[6], is_coded[6];

  2482.             /* Get CBPCY */

  2483.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2484.             for (i=0; i<6; i++)

  2485.             {

  2486.                 val = ((cbp >> (5 - i)) & 1);

  2487.                 s->dc_val[0][s->block_index[i]] = 0;

  2488.                 s->mb_intra = 0;

  2489.                 if(i < 4) {

  2490.                     dmv_x = dmv_y = 0;

  2491.                     s->mb_intra = 0;

  2492.                     mb_has_coeffs = 0;

  2493.                     if(val) {

  2494.                         GET_MVDATA(dmv_x, dmv_y);

  2495.                     }

  2496.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  2497.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  2498.                     intra_count += s->mb_intra;

  2499.                     is_intra[i] = s->mb_intra;

  2500.                     is_coded[i] = mb_has_coeffs;

  2501.                 }

  2502.                 if(i&4){

  2503.                     is_intra[i] = (intra_count >= 3);

  2504.                     is_coded[i] = val;

  2505.                 }

  2506.                 if(i == 4) vc1_mc_4mv_chroma(v);

  2507.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  2508.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  2509.             }

  2510.             dst_idx = 0;

  2511.             GET_MQUANT();

  2512.             s->current_picture.qscale_table[mb_pos] = mquant;

  2513.             /* test if block is intra and has pred */

  2514.             {

  2515.                 int intrapred = 0;

  2516.                 for(i=0; i<6; i++)

  2517.                     if(is_intra[i]) {

  2518.                         if(v->mb_type[0][s->block_index[i] - s->block_wrap[i]] || v->mb_type[0][s->block_index[i] - 1]) {

  2519.                             intrapred = 1;

  2520.                             break;

  2521.                         }

  2522.                     }

  2523.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  2524.                 else s->ac_pred = 0;

  2525.             }

  2526.             if (!v->ttmbf && coded_inter)

  2527.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 12);

  2528.             for (i=0; i<6; i++)

  2529.             {

  2530.                 dst_idx += i >> 2;

  2531.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2532.                 s->mb_intra = is_intra[i];

  2533.                 if (is_intra[i]) {

  2534.                     /* check if prediction blocks A and C are available */

  2535.                     v->a_avail = v->c_avail = 0;

  2536.                     if(i == 2 || i == 3 || s->mb_y)

  2537.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2538.                     if(i == 1 || i == 3 || s->mb_x)

  2539.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2540. 

  2541.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  2542.                     //s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2543.                     /* TODO: proper loop filtering */

  2544.                     if(v->pq >= 9 && v->overlap) {

  2545.                         if(v->a_avail)

  2546.                             s->dsp.h263_v_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2547.                         if(v->c_avail)

  2548.                             s->dsp.h263_h_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2549.                     }

  2550.                 } else if(is_coded[i]) {

  2551.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2552.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2553.                     first_block = 0;

  2554.                     //s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2555.                 }

  2556.             }

  2557.             return status;

  2558.         }

  2559.         else //Skipped MB

  2560.         {

  2561.             for (i=0; i<4; i++)

  2562.             {

  2563.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  2564.                 vc1_mc_4mv_luma(v, i);

  2565.             }

  2566.             vc1_mc_4mv_chroma(v);

  2567.             for(i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2568.             s->current_picture.qscale_table[mb_pos] = 0;

  2569.             return 0;

  2570.         }

  2571.     }

  2572. 

  2573.     /* Should never happen */

  2574.     return -1;

  2575. }

  2576. 

  2577. /** Decode blocks of I-frame

  2578.  */

  2579. static void vc1_decode_i_blocks(VC1Context *v)

  2580. {

  2581.     int k;

  2582.     MpegEncContext *s = &v->s;

  2583.     int cbp, val;

  2584.     uint8_t *coded_val;

  2585.     int mb_pos;

  2586. 

  2587.     /* select codingmode used for VLC tables selection */

  2588.     switch(v->y_ac_table_index){

  2589.     case 0:

  2590.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2591.         break;

  2592.     case 1:

  2593.         v->codingset = CS_HIGH_MOT_INTRA;

  2594.         break;

  2595.     case 2:

  2596.         v->codingset = CS_MID_RATE_INTRA;

  2597.         break;

  2598.     }

  2599. 

  2600.     switch(v->c_ac_table_index){

  2601.     case 0:

  2602.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2603.         break;

  2604.     case 1:

  2605.         v->codingset2 = CS_HIGH_MOT_INTER;

  2606.         break;

  2607.     case 2:

  2608.         v->codingset2 = CS_MID_RATE_INTER;

  2609.         break;

  2610.     }

  2611. 

  2612.     /* Set DC scale - y and c use the same */

  2613.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2614.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2615. 

  2616.     //do frame decode

  2617.     s->mb_x = s->mb_y = 0;

  2618.     s->mb_intra = 1;

  2619.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2620.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2621.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2622.             ff_init_block_index(s);

  2623.             ff_update_block_index(s);

  2624.             s->dsp.clear_blocks(s->block[0]);

  2625.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2626.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2627.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2628. 

  2629.             // do actual MB decoding and displaying

  2630.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2631.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2632. 

  2633.             for(k = 0; k < 6; k++) {

  2634.                 val = ((cbp >> (5 - k)) & 1);

  2635. 

  2636.                 if (k < 4) {

  2637.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2638.                     val = val ^ pred;

  2639.                     *coded_val = val;

  2640.                 }

  2641.                 cbp |= val << (5 - k);

  2642. 

  2643.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2644. 

  2645.                 vc1_inv_trans(s->block[k], 8, 8);

  2646.                 if(v->pq >= 9 && v->overlap) {

  2647.                     vc1_overlap_block(s, s->block[k], k, (s->mb_y || k>1), (s->mb_x || (k != 0 && k != 2)));

  2648.                 }

  2649.             }

  2650. 

  2651.             vc1_put_block(v, s->block);

  2652.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2653.                 if(s->mb_y) {

  2654.                     s->dsp.h263_v_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2655.                     s->dsp.h263_v_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2656.                     s->dsp.h263_v_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2657.                     s->dsp.h263_v_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2658.                 }

  2659.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2660.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2661.                 if(s->mb_x) {

  2662.                     s->dsp.h263_h_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2663.                     s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2664.                     s->dsp.h263_h_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2665.                     s->dsp.h263_h_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2666.                 }

  2667.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2668.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2669.             }

  2670. 

  2671.             if(get_bits_count(&s->gb) > v->bits) {

  2672.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2673.                 return;

  2674.             }

  2675.         }

  2676.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2677.     }

  2678. }

  2679. 

  2680. static void vc1_decode_p_blocks(VC1Context *v)

  2681. {

  2682.     MpegEncContext *s = &v->s;

  2683. 

  2684.     /* select codingmode used for VLC tables selection */

  2685.     switch(v->c_ac_table_index){

  2686.     case 0:

  2687.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2688.         break;

  2689.     case 1:

  2690.         v->codingset = CS_HIGH_MOT_INTRA;

  2691.         break;

  2692.     case 2:

  2693.         v->codingset = CS_MID_RATE_INTRA;

  2694.         break;

  2695.     }

  2696. 

  2697.     switch(v->c_ac_table_index){

  2698.     case 0:

  2699.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2700.         break;

  2701.     case 1:

  2702.         v->codingset2 = CS_HIGH_MOT_INTER;

  2703.         break;

  2704.     case 2:

  2705.         v->codingset2 = CS_MID_RATE_INTER;

  2706.         break;

  2707.     }

  2708. 

  2709.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2710.     s->first_slice_line = 1;

  2711.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2712.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2713.             ff_init_block_index(s);

  2714.             ff_update_block_index(s);

  2715.             s->dsp.clear_blocks(s->block[0]);

  2716. 

  2717.             vc1_decode_p_mb(v, s->block);

  2718.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2719.                 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);

  2720.                 return;

  2721.             }

  2722.         }

  2723.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2724.         s->first_slice_line = 0;

  2725.     }

  2726. }

  2727. 

  2728. static void vc1_decode_blocks(VC1Context *v)

  2729. {

  2730. 

  2731.     v->s.esc3_level_length = 0;

  2732. 

  2733.     switch(v->s.pict_type) {

  2734.     case I_TYPE:

  2735.         vc1_decode_i_blocks(v);

  2736.         break;

  2737.     case P_TYPE:

  2738.         vc1_decode_p_blocks(v);

  2739.         break;

  2740.     }

  2741. }

  2742. 

  2743. 

  2744. /** Initialize a VC1/WMV3 decoder

  2745.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2746.  * @todo TODO: Decypher remaining bits in extra_data

  2747.  */

  2748. static int vc1_decode_init(AVCodecContext *avctx)

  2749. {

  2750.     VC1Context *v = avctx->priv_data;

  2751.     MpegEncContext *s = &v->s;

  2752.     GetBitContext gb;

  2753. 

  2754.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  2755.     avctx->pix_fmt = PIX_FMT_YUV420P;

  2756.     v->s.avctx = avctx;

  2757.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  2758.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  2759. 

  2760.     if(ff_h263_decode_init(avctx) < 0)

  2761.         return -1;

  2762.     if (vc1_init_common(v) < 0) return -1;

  2763. 

  2764.     av_log(avctx, AV_LOG_INFO, "This decoder is not supposed to produce picture. Dont report this as a bug!\n");

  2765.     av_log(avctx, AV_LOG_INFO, "If you see a picture, don't believe your eyes.\n");

  2766. 

  2767.     avctx->coded_width = avctx->width;

  2768.     avctx->coded_height = avctx->height;

  2769.     if (avctx->codec_id == CODEC_ID_WMV3)

  2770.     {

  2771.         int count = 0;

  2772. 

  2773.         // looks like WMV3 has a sequence header stored in the extradata

  2774.         // advanced sequence header may be before the first frame

  2775.         // the last byte of the extradata is a version number, 1 for the

  2776.         // samples we can decode

  2777. 

  2778.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  2779. 

  2780.         if (decode_sequence_header(avctx, &gb) < 0)

  2781.           return -1;

  2782. 

  2783.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  2784.         if (count>0)

  2785.         {

  2786.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  2787.                    count, get_bits(&gb, count));

  2788.         }

  2789.         else if (count < 0)

  2790.         {

  2791.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  2792.         }

  2793.     }

  2794.     avctx->has_b_frames= !!(avctx->max_b_frames);

  2795. 

  2796.     s->mb_width = (avctx->coded_width+15)>>4;

  2797.     s->mb_height = (avctx->coded_height+15)>>4;

  2798. 

  2799.     /* Allocate mb bitplanes */

  2800.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  2801. 

  2802.     /* allocate block type info in that way so it could be used with s->block_index[] */

  2803.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  2804.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  2805.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  2806.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  2807. 

  2808.     /* Init coded blocks info */

  2809.     if (v->profile == PROFILE_ADVANCED)

  2810.     {

  2811. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  2812. //            return -1;

  2813. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  2814. //            return -1;

  2815.     }

  2816. 

  2817.     return 0;

  2818. }

  2819. 

  2820. 

  2821. /** Decode a VC1/WMV3 frame

  2822.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2823.  * @warning Initial try at using MpegEncContext stuff

  2824.  */

  2825. static int vc1_decode_frame(AVCodecContext *avctx,

  2826.                             void *data, int *data_size,

  2827.                             uint8_t *buf, int buf_size)

  2828. {

  2829.     VC1Context *v = avctx->priv_data;

  2830.     MpegEncContext *s = &v->s;

  2831.     AVFrame *pict = data;

  2832. 

  2833.     /* no supplementary picture */

  2834.     if (buf_size == 0) {

  2835.         /* special case for last picture */

  2836.         if (s->low_delay==0 && s->next_picture_ptr) {

  2837.             *pict= *(AVFrame*)s->next_picture_ptr;

  2838.             s->next_picture_ptr= NULL;

  2839. 

  2840.             *data_size = sizeof(AVFrame);

  2841.         }

  2842. 

  2843.         return 0;

  2844.     }

  2845. 

  2846.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  2847.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  2848.         int i= ff_find_unused_picture(s, 0);

  2849.         s->current_picture_ptr= &s->picture[i];

  2850.     }

  2851. 

  2852.     avctx->has_b_frames= !s->low_delay;

  2853. 

  2854.     init_get_bits(&s->gb, buf, buf_size*8);

  2855.     // do parse frame header

  2856.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  2857.         return -1;

  2858. 

  2859.     if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;

  2860. 

  2861.     // for hurry_up==5

  2862.     s->current_picture.pict_type= s->pict_type;

  2863.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  2864. 

  2865.     /* skip B-frames if we don't have reference frames */

  2866.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  2867.     /* skip b frames if we are in a hurry */

  2868.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  2869.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  2870.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  2871.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  2872.         return buf_size;

  2873.     /* skip everything if we are in a hurry>=5 */

  2874.     if(avctx->hurry_up>=5) return -1;//buf_size;

  2875. 

  2876.     if(s->next_p_frame_damaged){

  2877.         if(s->pict_type==B_TYPE)

  2878.             return buf_size;

  2879.         else

  2880.             s->next_p_frame_damaged=0;

  2881.     }

  2882. 

  2883.     if(MPV_frame_start(s, avctx) < 0)

  2884.         return -1;

  2885. 

  2886.     ff_er_frame_start(s);

  2887. 

  2888.     v->bits = buf_size * 8;

  2889.     vc1_decode_blocks(v);

  2890. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  2891. //  if(get_bits_count(&s->gb) > buf_size * 8)

  2892. //      return -1;

  2893.     ff_er_frame_end(s);

  2894. 

  2895.     MPV_frame_end(s);

  2896. 

  2897. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  2898. assert(s->current_picture.pict_type == s->pict_type);

  2899.     if (s->pict_type == B_TYPE || s->low_delay) {

  2900.         *pict= *(AVFrame*)s->current_picture_ptr;

  2901.     } else if (s->last_picture_ptr != NULL) {

  2902.         *pict= *(AVFrame*)s->last_picture_ptr;

  2903.     }

  2904. 

  2905.     if(s->last_picture_ptr || s->low_delay){

  2906.         *data_size = sizeof(AVFrame);

  2907.         ff_print_debug_info(s, pict);

  2908.     }

  2909. 

  2910.     /* Return the Picture timestamp as the frame number */

  2911.     /* we substract 1 because it is added on utils.c    */

  2912.     avctx->frame_number = s->picture_number - 1;

  2913. 

  2914.     return buf_size;

  2915. }

  2916. 

  2917. 

  2918. /** Close a VC1/WMV3 decoder

  2919.  * @warning Initial try at using MpegEncContext stuff

  2920.  */

  2921. static int vc1_decode_end(AVCodecContext *avctx)

  2922. {

  2923.     VC1Context *v = avctx->priv_data;

  2924. 

  2925.     av_freep(&v->hrd_rate);

  2926.     av_freep(&v->hrd_buffer);

  2927.     MPV_common_end(&v->s);

  2928.     av_freep(&v->mv_type_mb_plane);

  2929.     av_freep(&v->mb_type_base);

  2930.     return 0;

  2931. }

  2932. 

  2933. 

  2934. AVCodec vc1_decoder = {

  2935.     "vc1",

  2936.     CODEC_TYPE_VIDEO,

  2937.     CODEC_ID_VC1,

  2938.     sizeof(VC1Context),

  2939.     vc1_decode_init,

  2940.     NULL,

  2941.     vc1_decode_end,

  2942.     vc1_decode_frame,

  2943.     CODEC_CAP_DELAY,

  2944.     NULL

  2945. };

  2946. 

  2947. AVCodec wmv3_decoder = {

  2948.     "wmv3",

  2949.     CODEC_TYPE_VIDEO,

  2950.     CODEC_ID_WMV3,

  2951.     sizeof(VC1Context),

  2952.     vc1_decode_init,

  2953.     NULL,

  2954.     vc1_decode_end,

  2955.     vc1_decode_frame,

  2956.     CODEC_CAP_DELAY,

  2957.     NULL

  2958. };