falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
6247 Commits
32 Branches
484MB
Tree: 3b0df5254e
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '3b0df5254e'
${ noResults }
FFmpeg/libavcodec/vc1.c

3231 lines
108KB
Raw Blame History 

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

  141. 

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

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

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

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

  146. };

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

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

  149.   { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN }

  150. };

  151. 

  152. /** One more frame type */

  153. #define BI_TYPE 7

  154. 

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

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

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

  158.   {  /* Implicit quantizer */

  159.      0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,

  160.     13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31

  161.   },

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

  163.      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  164.     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

  165.   },

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

  167.      0,  1,  1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,

  168.     14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31

  169.   }

  170. };

  171. 

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

  173.  *  @todo TODO move this into the context

  174.  */

  175. //@{

  176. #define VC1_BFRACTION_VLC_BITS 7

  177. static VLC vc1_bfraction_vlc;

  178. #define VC1_IMODE_VLC_BITS 4

  179. static VLC vc1_imode_vlc;

  180. #define VC1_NORM2_VLC_BITS 3

  181. static VLC vc1_norm2_vlc;

  182. #define VC1_NORM6_VLC_BITS 9

  183. static VLC vc1_norm6_vlc;

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

  185. #define VC1_TTMB_VLC_BITS 9 //12

  186. static VLC vc1_ttmb_vlc[3];

  187. #define VC1_MV_DIFF_VLC_BITS 9 //15

  188. static VLC vc1_mv_diff_vlc[4];

  189. #define VC1_CBPCY_P_VLC_BITS 9 //14

  190. static VLC vc1_cbpcy_p_vlc[4];

  191. #define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6

  192. static VLC vc1_4mv_block_pattern_vlc[4];

  193. #define VC1_TTBLK_VLC_BITS 5

  194. static VLC vc1_ttblk_vlc[3];

  195. #define VC1_SUBBLKPAT_VLC_BITS 6

  196. static VLC vc1_subblkpat_vlc[3];

  197. 

  198. static VLC vc1_ac_coeff_table[8];

  199. //@}

  200. 

  201. enum CodingSet {

  202.     CS_HIGH_MOT_INTRA = 0,

  203.     CS_HIGH_MOT_INTER,

  204.     CS_LOW_MOT_INTRA,

  205.     CS_LOW_MOT_INTER,

  206.     CS_MID_RATE_INTRA,

  207.     CS_MID_RATE_INTER,

  208.     CS_HIGH_RATE_INTRA,

  209.     CS_HIGH_RATE_INTER

  210. };

  211. 

  212. /** The VC1 Context

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

  214.  * Many members are only used for Advanced Profile

  215.  */

  216. typedef struct VC1Context{

  217.     MpegEncContext s;

  218. 

  219.     int bits;

  220. 

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

  222.     //@{

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

  224.     int res_x8;           ///< reserved

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

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

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

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

  229.                           ///< at frame level

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

  231.     int reserved;         ///< reserved

  232.     //@}

  233. 

  234.     /** Advanced Profile */

  235.     //@{

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

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

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

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

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

  241.     int tfcntrflag;       ///< TFCNTR present

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

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

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

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

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

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

  248.                           ///< Decoder parameters

  249.     //@}

  250. 

  251.     /** Sequence header data for all Profiles

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

  253.      */

  254.     //@{

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

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

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

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

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

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

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

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

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

  264.     int finterpflag;      ///< INTERPFRM present

  265.     //@}

  266. 

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

  268.     //@{

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

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

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

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

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

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

  275.     /** pquant parameters */

  276.     //@{

  277.     uint8_t dquantfrm;

  278.     uint8_t dqprofile;

  279.     uint8_t dqsbedge;

  280.     uint8_t dqbilevel;

  281.     //@}

  282.     /** AC coding set indexes

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

  284.      */

  285.     //@{

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

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

  288.     //@}

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

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

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

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

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

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

  295.     int a_avail, c_avail;

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

  297. 

  298. 

  299.     /** Luma compensation parameters */

  300.     //@{

  301.     uint8_t lumscale;

  302.     uint8_t lumshift;

  303.     //@}

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

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

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

  307.     int buffer_fullness;  ///< HRD info

  308.     /** Ranges:

  309.      * -# 0 -> [-64n 63.f] x [-32, 31.f]

  310.      * -# 1 -> [-128, 127.f] x [-64, 63.f]

  311.      * -# 2 -> [-512, 511.f] x [-128, 127.f]

  312.      * -# 3 -> [-1024, 1023.f] x [-256, 255.f]

  313.      */

  314.     uint8_t mvrange;

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

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

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

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

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

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

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

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

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

  324.     int rnd;                      ///< rounding control

  325. 

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

  327.     //@{

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

  329.     uint8_t interpfrm;

  330.     //@}

  331. 

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

  333.     //@{

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

  335.     uint8_t numpanscanwin;

  336.     uint8_t tfcntr;

  337.     uint8_t rptfrm, tff, rff;

  338.     uint16_t topleftx;

  339.     uint16_t toplefty;

  340.     uint16_t bottomrightx;

  341.     uint16_t bottomrighty;

  342.     uint8_t uvsamp;

  343.     uint8_t postproc;

  344.     int hrd_num_leaky_buckets;

  345.     uint8_t bit_rate_exponent;

  346.     uint8_t buffer_size_exponent;

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

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

  349.     uint8_t condover;

  350.     uint16_t *hrd_rate, *hrd_buffer;

  351.     uint8_t *hrd_fullness;

  352.     uint8_t range_mapy_flag;

  353.     uint8_t range_mapuv_flag;

  354.     uint8_t range_mapy;

  355.     uint8_t range_mapuv;

  356.     //@}

  357. } VC1Context;

  358. 

  359. /**

  360.  * Get unary code of limited length

  361.  * @fixme FIXME Slow and ugly

  362.  * @param gb GetBitContext

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

  364.  * @param[in] len Maximum length

  365.  * @return Unary length/index

  366.  */

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

  368. {

  369. #if 1

  370.     int i;

  371. 

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

  373.     return i;

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

  375. 

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

  377.   {

  378.     tmp = get_bits(gb, 1);

  379.     i++;

  380.   }

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

  382.   return i;*/

  383. #else

  384.   unsigned int buf;

  385.   int log;

  386. 

  387.   OPEN_READER(re, gb);

  388.   UPDATE_CACHE(re, gb);

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

  390.   if (stop) buf = ~buf;

  391. 

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

  393.   if (log < limit){

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

  395.     CLOSE_READER(re, gb);

  396.     return log;

  397.   }

  398. 

  399.   LAST_SKIP_BITS(re, gb, limit);

  400.   CLOSE_READER(re, gb);

  401.   return limit;

  402. #endif

  403. }

  404. 

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

  406.     int n;

  407.     n = get_bits1(gb);

  408.     if (n == 1)

  409.         return 0;

  410.     else

  411.         return 2 - get_bits1(gb);

  412. }

  413. 

  414. /**

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

  416.  * @param v The VC1Context to initialize

  417.  * @return Status

  418.  */

  419. static int vc1_init_common(VC1Context *v)

  420. {

  421.     static int done = 0;

  422.     int i = 0;

  423. 

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

  425. 

  426.     /* VLC tables */

  427.     if(!done)

  428.     {

  429.         done = 1;

  430.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  431.                  vc1_bfraction_bits, 1, 1,

  432.                  vc1_bfraction_codes, 1, 1, 1);

  433.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  434.                  vc1_norm2_bits, 1, 1,

  435.                  vc1_norm2_codes, 1, 1, 1);

  436.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  437.                  vc1_norm6_bits, 1, 1,

  438.                  vc1_norm6_codes, 2, 2, 1);

  439.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  440.                  vc1_imode_bits, 1, 1,

  441.                  vc1_imode_codes, 1, 1, 1);

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

  443.         {

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

  445.                      vc1_ttmb_bits[i], 1, 1,

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

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

  448.                      vc1_ttblk_bits[i], 1, 1,

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

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

  451.                      vc1_subblkpat_bits[i], 1, 1,

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

  453.         }

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

  455.         {

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

  457.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  460.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  463.                      vc1_mv_diff_bits[i], 1, 1,

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

  465.         }

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

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

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

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

  470.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  473.     }

  474. 

  475.     /* Other defaults */

  476.     v->pq = -1;

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

  478. 

  479.     return 0;

  480. }

  481. 

  482. /***********************************************************************/

  483. /**

  484.  * @defgroup bitplane VC9 Bitplane decoding

  485.  * @see 8.7, p56

  486.  * @{

  487.  */

  488. 

  489. /** @addtogroup bitplane

  490.  * Imode types

  491.  * @{

  492.  */

  493. enum Imode {

  494.     IMODE_RAW,

  495.     IMODE_NORM2,

  496.     IMODE_DIFF2,

  497.     IMODE_NORM6,

  498.     IMODE_DIFF6,

  499.     IMODE_ROWSKIP,

  500.     IMODE_COLSKIP

  501. };

  502. /** @} */ //imode defines

  503. 

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

  505.  * @param plane Buffer to store decoded bits

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

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

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

  509.  */

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

  511.     int x, y;

  512. 

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

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

  515.             memset(plane, 0, width);

  516.         else

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

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

  519.         plane += stride;

  520.     }

  521. }

  522. 

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

  524.  * @param plane Buffer to store decoded bits

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

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

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

  528.  * @fixme FIXME: Optimize

  529.  */

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

  531.     int x, y;

  532. 

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

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

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

  536.                 plane[y*stride] = 0;

  537.         else

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

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

  540.         plane ++;

  541.     }

  542. }

  543. 

  544. /** Decode a bitplane's bits

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

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

  547.  * @return Status

  548.  * @fixme FIXME: Optimize

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

  550.  */

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

  552. {

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

  554. 

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

  556.     uint8_t invert, *planep = data;

  557.     int width, height, stride;

  558. 

  559.     width = v->s.mb_width;

  560.     height = v->s.mb_height;

  561.     stride = v->s.mb_stride;

  562.     invert = get_bits(gb, 1);

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

  564. 

  565.     *raw_flag = 0;

  566.     switch (imode)

  567.     {

  568.     case IMODE_RAW:

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

  570.         *raw_flag = 1; //invert ignored

  571.         return invert;

  572.     case IMODE_DIFF2:

  573.     case IMODE_NORM2:

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

  575.         {

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

  577.             offset = 1;

  578.         }

  579.         else offset = 0;

  580.         // decode bitplane as one long line

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

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

  583.             *planep++ = code & 1;

  584.             offset++;

  585.             if(offset == width) {

  586.                 offset = 0;

  587.                 planep += stride - width;

  588.             }

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

  590.             offset++;

  591.             if(offset == width) {

  592.                 offset = 0;

  593.                 planep += stride - width;

  594.             }

  595.         }

  596.         break;

  597.     case IMODE_DIFF6:

  598.     case IMODE_NORM6:

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

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

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

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

  603.                     if(code < 0){

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

  605.                         return -1;

  606.                     }

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

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

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

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

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

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

  613.                 }

  614.                 planep += stride * 3;

  615.             }

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

  617.         } else { // 3x2

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

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

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

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

  622.                     if(code < 0){

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

  624.                         return -1;

  625.                     }

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

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

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

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

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

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

  632.                 }

  633.                 planep += stride * 2;

  634.             }

  635.             x = width % 3;

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

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

  638.         }

  639.         break;

  640.     case IMODE_ROWSKIP:

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

  642.         break;

  643.     case IMODE_COLSKIP:

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

  645.         break;

  646.     default: break;

  647.     }

  648. 

  649.     /* Applying diff operator */

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

  651.     {

  652.         planep = data;

  653.         planep[0] ^= invert;

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

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

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

  657.         {

  658.             planep += stride;

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

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

  661.             {

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

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

  664.             }

  665.         }

  666.     }

  667.     else if (invert)

  668.     {

  669.         planep = data;

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

  671.     }

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

  673. }

  674. 

  675. /** @} */ //Bitplane group

  676. 

  677. /***********************************************************************/

  678. /** VOP Dquant decoding

  679.  * @param v VC-1 Context

  680.  */

  681. static int vop_dquant_decoding(VC1Context *v)

  682. {

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

  684.     int pqdiff;

  685. 

  686.     //variable size

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

  688.     {

  689.         pqdiff = get_bits(gb, 3);

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

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

  692.     }

  693.     else

  694.     {

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

  696.         if ( v->dquantfrm )

  697.         {

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

  699.             switch (v->dqprofile)

  700.             {

  701.             case DQPROFILE_SINGLE_EDGE:

  702.             case DQPROFILE_DOUBLE_EDGES:

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

  704.                 break;

  705.             case DQPROFILE_ALL_MBS:

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

  707.             default: break; //Forbidden ?

  708.             }

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

  710.             {

  711.                 pqdiff = get_bits(gb, 3);

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

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

  714.             }

  715.         }

  716.     }

  717.     return 0;

  718. }

  719. 

  720. /** Put block onto picture

  721.  * @todo move to DSPContext

  722.  */

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

  724. {

  725.     uint8_t *Y;

  726.     int ys, us, vs;

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

  728. 

  729.     if(v->rangeredfrm) {

  730.         int i, j, k;

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

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

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

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

  735. 

  736.     }

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

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

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

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

  741. 

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

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

  744.     Y += ys * 8;

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

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

  747. 

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

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

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

  751.     }

  752. }

  753. 

  754. /** Do motion compensation over 1 macroblock

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

  756.  */

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

  758. {

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

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

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

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

  763. 

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

  765. 

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

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

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

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

  770.     if(!dir) {

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

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

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

  774.     } else {

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

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

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

  778.     }

  779. 

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

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

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

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

  784. 

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

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

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

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

  789. 

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

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

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

  793. 

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

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

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

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

  798.     }

  799. 

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

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

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

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

  804. 

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

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

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

  808.         srcY = s->edge_emu_buffer;

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

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

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

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

  813.         srcU = uvbuf;

  814.         srcV = uvbuf + 16;

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

  816.         if(v->rangeredfrm) {

  817.             int i, j;

  818.             uint8_t *src, *src2;

  819. 

  820.             src = srcY;

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

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

  823.                 src += s->linesize;

  824.             }

  825.             src = srcU; src2 = srcV;

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

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

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

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

  830.                 }

  831.                 src += s->uvlinesize;

  832.                 src2 += s->uvlinesize;

  833.             }

  834.         }

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

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

  837.             int i, j;

  838.             uint8_t *src, *src2;

  839. 

  840.             src = srcY;

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

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

  843.                 src += s->linesize;

  844.             }

  845.             src = srcU; src2 = srcV;

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

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

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

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

  850.                 }

  851.                 src += s->uvlinesize;

  852.                 src2 += s->uvlinesize;

  853.             }

  854.         }

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

  856.     }

  857. 

  858.     if(v->fastuvmc) {

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

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

  861.     }

  862. 

  863.     if(s->mspel) {

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

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

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

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

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

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

  870.     } else if(!s->quarter_sample) { // hpel mc

  871.         mx >>= 1;

  872.         my >>= 1;

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

  874. 

  875.         if(!v->rnd)

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

  877.         else

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

  879.     } else {

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

  881. 

  882.         if(!v->rnd)

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

  884.         else

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

  886.     }

  887. 

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

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

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

  891.     if(!v->rnd){

  892.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  893.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  894.     }else{

  895.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  896.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  897.     }

  898. }

  899. 

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

  901.  */

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

  903. {

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

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

  906.     uint8_t *srcY;

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

  908.     int off;

  909. 

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

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

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

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

  914. 

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

  916. 

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

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

  919. 

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

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

  922. 

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

  924. 

  925.     if(v->rangeredfrm || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 8 - s->mspel

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

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

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

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

  930.         srcY = s->edge_emu_buffer;

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

  932.         if(v->rangeredfrm) {

  933.             int i, j;

  934.             uint8_t *src;

  935. 

  936.             src = srcY;

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

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

  939.                 src += s->linesize;

  940.             }

  941.         }

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

  943.     }

  944. 

  945.     if(s->mspel) {

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

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

  948.     } else if(!s->quarter_sample) { // hpel mc

  949.         mx >>= 1;

  950.         my >>= 1;

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

  952. 

  953.         if(!v->rnd)

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

  955.         else

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

  957.     } else {

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

  959. 

  960.         if(!v->rnd)

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

  962.         else

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

  964.     }

  965. }

  966. 

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

  968. {

  969.     if(a < b) {

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

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

  972.     } else {

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

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

  975.     }

  976. }

  977. 

  978. 

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

  980.  */

  981. static void vc1_mc_4mv_chroma(VC1Context *v)

  982. {

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

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

  985.     uint8_t *srcU, *srcV;

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

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

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

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

  990. 

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

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

  993. 

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

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

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

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

  998.     }

  999. 

  1000.     /* calculate chroma MV vector from four luma MVs */

  1001.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  1002.     if(!idx) { // all blocks are inter

  1003.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1004.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1005.     } else if(count[idx] == 1) { // 3 inter blocks

  1006.         switch(idx) {

  1007.         case 0x1:

  1008.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1009.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1010.             break;

  1011.         case 0x2:

  1012.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1013.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1014.             break;

  1015.         case 0x4:

  1016.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1017.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1018.             break;

  1019.         case 0x8:

  1020.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1021.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1022.             break;

  1023.         }

  1024.     } else if(count[idx] == 2) {

  1025.         int t1 = 0, t2 = 0;

  1026.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1027.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1028.         tx = (mvx[t1] + mvx[t2]) / 2;

  1029.         ty = (mvy[t1] + mvy[t2]) / 2;

  1030.     } else

  1031.         return; //no need to do MC for inter blocks

  1032. 

  1033.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1034.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1035. 

  1036.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1037.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1038. 

  1039.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  1040.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  1041.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1042.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1043.     if(v->rangeredfrm || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  1044.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){

  1045.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1046.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1047.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1048.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1049.         srcU = s->edge_emu_buffer;

  1050.         srcV = s->edge_emu_buffer + 16;

  1051. 

  1052.         /* if we deal with range reduction we need to scale source blocks */

  1053.         if(v->rangeredfrm) {

  1054.             int i, j;

  1055.             uint8_t *src, *src2;

  1056. 

  1057.             src = srcU; src2 = srcV;

  1058.             for(j = 0; j < 9; j++) {

  1059.                 for(i = 0; i < 9; i++) {

  1060.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1061.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1062.                 }

  1063.                 src += s->uvlinesize;

  1064.                 src2 += s->uvlinesize;

  1065.             }

  1066.         }

  1067.     }

  1068. 

  1069.     if(v->fastuvmc) {

  1070.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1071.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1072.     }

  1073. 

  1074.     /* Chroma MC always uses qpel blilinear */

  1075.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1076.     if(!v->rnd){

  1077.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  1078.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  1079.     }else{

  1080.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  1081.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  1082.     }

  1083. }

  1084. 

  1085. /**

  1086.  * Decode Simple/Main Profiles sequence header

  1087.  * @see Figure 7-8, p16-17

  1088.  * @param avctx Codec context

  1089.  * @param gb GetBit context initialized from Codec context extra_data

  1090.  * @return Status

  1091.  */

  1092. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1093. {

  1094.     VC1Context *v = avctx->priv_data;

  1095. 

  1096.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1097.     v->profile = get_bits(gb, 2);

  1098.     if (v->profile == 2)

  1099.     {

  1100.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1101.         return -1;

  1102.     }

  1103. 

  1104.     if (v->profile == PROFILE_ADVANCED)

  1105.     {

  1106.         v->level = get_bits(gb, 3);

  1107.         if(v->level >= 5)

  1108.         {

  1109.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1110.         }

  1111.         v->chromaformat = get_bits(gb, 2);

  1112.         if (v->chromaformat != 1)

  1113.         {

  1114.             av_log(avctx, AV_LOG_ERROR,

  1115.                    "Only 4:2:0 chroma format supported\n");

  1116.             return -1;

  1117.         }

  1118.     }

  1119.     else

  1120.     {

  1121.         v->res_sm = get_bits(gb, 2); //reserved

  1122.         if (v->res_sm)

  1123.         {

  1124.             av_log(avctx, AV_LOG_ERROR,

  1125.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1126.             return -1;

  1127.         }

  1128.     }

  1129. 

  1130.     // (fps-2)/4 (->30)

  1131.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1132.     // (bitrate-32kbps)/64kbps

  1133.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1134.     v->s.loop_filter = get_bits(gb, 1); //common

  1135.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1136.     {

  1137.         av_log(avctx, AV_LOG_ERROR,

  1138.                "LOOPFILTER shell not be enabled in simple profile\n");

  1139.     }

  1140. 

  1141.     if (v->profile < PROFILE_ADVANCED)

  1142.     {

  1143.         v->res_x8 = get_bits(gb, 1); //reserved

  1144.         if (v->res_x8)

  1145.         {

  1146.             av_log(avctx, AV_LOG_ERROR,

  1147.                    "1 for reserved RES_X8 is forbidden\n");

  1148.             //return -1;

  1149.         }

  1150.         v->multires = get_bits(gb, 1);

  1151.         v->res_fasttx = get_bits(gb, 1);

  1152.         if (!v->res_fasttx)

  1153.         {

  1154.             av_log(avctx, AV_LOG_ERROR,

  1155.                    "0 for reserved RES_FASTTX is forbidden\n");

  1156.             //return -1;

  1157.         }

  1158.     }

  1159. 

  1160.     v->fastuvmc =  get_bits(gb, 1); //common

  1161.     if (!v->profile && !v->fastuvmc)

  1162.     {

  1163.         av_log(avctx, AV_LOG_ERROR,

  1164.                "FASTUVMC unavailable in Simple Profile\n");

  1165.         return -1;

  1166.     }

  1167.     v->extended_mv =  get_bits(gb, 1); //common

  1168.     if (!v->profile && v->extended_mv)

  1169.     {

  1170.         av_log(avctx, AV_LOG_ERROR,

  1171.                "Extended MVs unavailable in Simple Profile\n");

  1172.         return -1;

  1173.     }

  1174.     v->dquant =  get_bits(gb, 2); //common

  1175.     v->vstransform =  get_bits(gb, 1); //common

  1176. 

  1177.     if (v->profile < PROFILE_ADVANCED)

  1178.     {

  1179.         v->res_transtab = get_bits(gb, 1);

  1180.         if (v->res_transtab)

  1181.         {

  1182.             av_log(avctx, AV_LOG_ERROR,

  1183.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1184.             return -1;

  1185.         }

  1186.     }

  1187. 

  1188.     v->overlap = get_bits(gb, 1); //common

  1189. 

  1190.     if (v->profile < PROFILE_ADVANCED)

  1191.     {

  1192.         v->s.resync_marker = get_bits(gb, 1);

  1193.         v->rangered = get_bits(gb, 1);

  1194.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1195.         {

  1196.             av_log(avctx, AV_LOG_INFO,

  1197.                    "RANGERED should be set to 0 in simple profile\n");

  1198.         }

  1199.     }

  1200. 

  1201.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1202.     v->quantizer_mode = get_bits(gb, 2); //common

  1203. 

  1204.     if (v->profile < PROFILE_ADVANCED)

  1205.     {

  1206.         v->finterpflag = get_bits(gb, 1); //common

  1207.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1208.         if (!v->res_rtm_flag)

  1209.         {

  1210. //            av_log(avctx, AV_LOG_ERROR,

  1211. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  1212.             av_log(avctx, AV_LOG_ERROR,

  1213.                    "Old WMV3 version detected, only I-frames will be decoded\n");

  1214.             //return -1;

  1215.         }

  1216.         av_log(avctx, AV_LOG_DEBUG,

  1217.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1218.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  1219.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1220.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1221.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1222.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1223.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1224.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1225.                );

  1226.         return 0;

  1227.     }

  1228.     return -1;

  1229. }

  1230. 

  1231. 

  1232. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1233. {

  1234.     int pqindex, lowquant, status;

  1235. 

  1236.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1237.     skip_bits(gb, 2); //framecnt unused

  1238.     v->rangeredfrm = 0;

  1239.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1240.     v->s.pict_type = get_bits(gb, 1);

  1241.     if (v->s.avctx->max_b_frames) {

  1242.         if (!v->s.pict_type) {

  1243.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1244.             else v->s.pict_type = B_TYPE;

  1245.         } else v->s.pict_type = P_TYPE;

  1246.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1247. 

  1248.     if(v->s.pict_type == I_TYPE)

  1249.         get_bits(gb, 7); // skip buffer fullness

  1250.     if(v->s.pict_type == B_TYPE) {

  1251.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1252.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1253.         if(v->bfraction == -1) {

  1254.             v->s.pict_type = BI_TYPE;

  1255.         }

  1256.     }

  1257. 

  1258.     /* calculate RND */

  1259.     if(v->s.pict_type == I_TYPE)

  1260.         v->rnd = 1;

  1261.     if(v->s.pict_type == P_TYPE)

  1262.         v->rnd ^= 1;

  1263. 

  1264.     /* Quantizer stuff */

  1265.     pqindex = get_bits(gb, 5);

  1266.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1267.         v->pq = pquant_table[0][pqindex];

  1268.     else

  1269.         v->pq = pquant_table[1][pqindex];

  1270. 

  1271.     v->pquantizer = 1;

  1272.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1273.         v->pquantizer = pqindex < 9;

  1274.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1275.         v->pquantizer = 0;

  1276.     v->pqindex = pqindex;

  1277.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1278.     else v->halfpq = 0;

  1279.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1280.         v->pquantizer = get_bits(gb, 1);

  1281.     v->dquantfrm = 0;

  1282.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1283.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1284.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1285.     v->range_x = 1 << (v->k_x - 1);

  1286.     v->range_y = 1 << (v->k_y - 1);

  1287.     if (v->profile == PROFILE_ADVANCED)

  1288.     {

  1289.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1290.     }

  1291.     else

  1292.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1293. 

  1294. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1295. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1296. 

  1297.     //TODO: complete parsing for P/B/BI frames

  1298.     switch(v->s.pict_type) {

  1299.     case P_TYPE:

  1300.         if (v->pq < 5) v->tt_index = 0;

  1301.         else if(v->pq < 13) v->tt_index = 1;

  1302.         else v->tt_index = 2;

  1303. 

  1304.         lowquant = (v->pq > 12) ? 0 : 1;

  1305.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1306.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1307.         {

  1308.             int scale, shift, i;

  1309.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1310.             v->lumscale = get_bits(gb, 6);

  1311.             v->lumshift = get_bits(gb, 6);

  1312.             /* fill lookup tables for intensity compensation */

  1313.             if(!v->lumscale) {

  1314.                 scale = -64;

  1315.                 shift = (255 - v->lumshift * 2) << 6;

  1316.                 if(v->lumshift > 31)

  1317.                     shift += 128 << 6;

  1318.             } else {

  1319.                 scale = v->lumscale + 32;

  1320.                 if(v->lumshift > 31)

  1321.                     shift = (v->lumshift - 64) << 6;

  1322.                 else

  1323.                     shift = v->lumshift << 6;

  1324.             }

  1325.             for(i = 0; i < 256; i++) {

  1326.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1327.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1328.             }

  1329.         }

  1330.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1331.             v->s.quarter_sample = 0;

  1332.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1333.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1334.                 v->s.quarter_sample = 0;

  1335.             else

  1336.                 v->s.quarter_sample = 1;

  1337.         } else

  1338.             v->s.quarter_sample = 1;

  1339.         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));

  1340. 

  1341.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1342.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1343.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1344.         {

  1345.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1346.             if (status < 0) return -1;

  1347.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1348.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1349.         } else {

  1350.             v->mv_type_is_raw = 0;

  1351.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1352.         }

  1353.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1354.         if (status < 0) return -1;

  1355.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1356.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1357. 

  1358.         /* Hopefully this is correct for P frames */

  1359.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1360.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1361. 

  1362.         if (v->dquant)

  1363.         {

  1364.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1365.             vop_dquant_decoding(v);

  1366.         }

  1367. 

  1368.         v->ttfrm = 0; //FIXME Is that so ?

  1369.         if (v->vstransform)

  1370.         {

  1371.             v->ttmbf = get_bits(gb, 1);

  1372.             if (v->ttmbf)

  1373.             {

  1374.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1375.             }

  1376.         } else {

  1377.             v->ttmbf = 1;

  1378.             v->ttfrm = TT_8X8;

  1379.         }

  1380.         break;

  1381.     case B_TYPE:

  1382.         if (v->pq < 5) v->tt_index = 0;

  1383.         else if(v->pq < 13) v->tt_index = 1;

  1384.         else v->tt_index = 2;

  1385. 

  1386.         lowquant = (v->pq > 12) ? 0 : 1;

  1387.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1388.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1389.         v->s.mspel = v->s.quarter_sample;

  1390. 

  1391.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1392.         if (status < 0) return -1;

  1393.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1394.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1395.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1396.         if (status < 0) return -1;

  1397.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1398.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1399. 

  1400.         v->s.mv_table_index = get_bits(gb, 2);

  1401.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1402. 

  1403.         if (v->dquant)

  1404.         {

  1405.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1406.             vop_dquant_decoding(v);

  1407.         }

  1408. 

  1409.         v->ttfrm = 0;

  1410.         if (v->vstransform)

  1411.         {

  1412.             v->ttmbf = get_bits(gb, 1);

  1413.             if (v->ttmbf)

  1414.             {

  1415.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1416.             }

  1417.         } else {

  1418.             v->ttmbf = 1;

  1419.             v->ttfrm = TT_8X8;

  1420.         }

  1421.         break;

  1422.     }

  1423. 

  1424.     /* AC Syntax */

  1425.     v->c_ac_table_index = decode012(gb);

  1426.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1427.     {

  1428.         v->y_ac_table_index = decode012(gb);

  1429.     }

  1430.     /* DC Syntax */

  1431.     v->s.dc_table_index = get_bits(gb, 1);

  1432. 

  1433.     return 0;

  1434. }

  1435. 

  1436. /***********************************************************************/

  1437. /**

  1438.  * @defgroup block VC-1 Block-level functions

  1439.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1440.  * @todo TODO: Integrate to MpegEncContext facilities

  1441.  * @{

  1442.  */

  1443. 

  1444. /**

  1445.  * @def GET_MQUANT

  1446.  * @brief Get macroblock-level quantizer scale

  1447.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1448.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1449.  */

  1450. #define GET_MQUANT()                                           \

  1451.   if (v->dquantfrm)                                            \

  1452.   {                                                            \

  1453.     int edges = 0;                                             \

  1454.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1455.     {                                                          \

  1456.       if (v->dqbilevel)                                        \

  1457.       {                                                        \

  1458.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1459.       }                                                        \

  1460.       else                                                     \

  1461.       {                                                        \

  1462.         mqdiff = get_bits(gb, 3);                              \

  1463.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1464.         else mquant = get_bits(gb, 5);                         \

  1465.       }                                                        \

  1466.     }                                                          \

  1467.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1468.         edges = 1 << v->dqsbedge;                              \

  1469.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1470.         edges = (3 << v->dqsbedge) % 15;                       \

  1471.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1472.         edges = 15;                                            \

  1473.     if((edges&1) && !s->mb_x)                                  \

  1474.         mquant = v->altpq;                                     \

  1475.     if((edges&2) && s->first_slice_line)                       \

  1476.         mquant = v->altpq;                                     \

  1477.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1478.         mquant = v->altpq;                                     \

  1479.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1480.         mquant = v->altpq;                                     \

  1481.   }

  1482. 

  1483. /**

  1484.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1485.  * @brief Get MV differentials

  1486.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1487.  * @param _dmv_x Horizontal differential for decoded MV

  1488.  * @param _dmv_y Vertical differential for decoded MV

  1489.  * @todo TODO: Use MpegEncContext arrays to store them

  1490.  */

  1491. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1492.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1493.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1494.   if (index > 36)                                                   \

  1495.   {                                                                 \

  1496.     mb_has_coeffs = 1;                                              \

  1497.     index -= 37;                                                    \

  1498.   }                                                                 \

  1499.   else mb_has_coeffs = 0;                                           \

  1500.   s->mb_intra = 0;                                                  \

  1501.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1502.   else if (index == 35)                                             \

  1503.   {                                                                 \

  1504.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1505.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1506.   }                                                                 \

  1507.   else if (index == 36)                                             \

  1508.   {                                                                 \

  1509.     _dmv_x = 0;                                                     \

  1510.     _dmv_y = 0;                                                     \

  1511.     s->mb_intra = 1;                                                \

  1512.   }                                                                 \

  1513.   else                                                              \

  1514.   {                                                                 \

  1515.     index1 = index%6;                                               \

  1516.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1517.     else                                   val = 0;                 \

  1518.     if(size_table[index1] - val > 0)                                \

  1519.         val = get_bits(gb, size_table[index1] - val);               \

  1520.     else                                   val = 0;                 \

  1521.     sign = 0 - (val&1);                                             \

  1522.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1523.                                                                     \

  1524.     index1 = index/6;                                               \

  1525.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1526.     else                                   val = 0;                 \

  1527.     if(size_table[index1] - val > 0)                                \

  1528.         val = get_bits(gb, size_table[index1] - val);               \

  1529.     else                                   val = 0;                 \

  1530.     sign = 0 - (val&1);                                             \

  1531.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1532.   }

  1533. 

  1534. /** Predict and set motion vector

  1535.  */

  1536. 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)

  1537. {

  1538.     int xy, wrap, off = 0;

  1539.     int16_t *A, *B, *C;

  1540.     int px, py;

  1541.     int sum;

  1542. 

  1543.     /* scale MV difference to be quad-pel */

  1544.     dmv_x <<= 1 - s->quarter_sample;

  1545.     dmv_y <<= 1 - s->quarter_sample;

  1546. 

  1547.     wrap = s->b8_stride;

  1548.     xy = s->block_index[n];

  1549. 

  1550.     if(s->mb_intra){

  1551.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1552.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1553.         if(mv1) { /* duplicate motion data for 1-MV block */

  1554.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1555.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1556.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1557.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1558.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1559.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1560.         }

  1561.         return;

  1562.     }

  1563. 

  1564.     C = s->current_picture.motion_val[0][xy - 1];

  1565.     A = s->current_picture.motion_val[0][xy - wrap];

  1566.     if(mv1)

  1567.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1568.     else {

  1569.         //in 4-MV mode different blocks have different B predictor position

  1570.         switch(n){

  1571.         case 0:

  1572.             off = (s->mb_x > 0) ? -1 : 1;

  1573.             break;

  1574.         case 1:

  1575.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1576.             break;

  1577.         case 2:

  1578.             off = 1;

  1579.             break;

  1580.         case 3:

  1581.             off = -1;

  1582.         }

  1583.     }

  1584.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1585. 

  1586.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1587.         if(s->mb_width == 1) {

  1588.             px = A[0];

  1589.             py = A[1];

  1590.         } else {

  1591.             px = mid_pred(A[0], B[0], C[0]);

  1592.             py = mid_pred(A[1], B[1], C[1]);

  1593.         }

  1594.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1595.         px = C[0];

  1596.         py = C[1];

  1597.     } else {

  1598.         px = py = 0;

  1599.     }

  1600.     /* Pullback MV as specified in 8.3.5.3.4 */

  1601.     {

  1602.         int qx, qy, X, Y;

  1603.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1604.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1605.         X = (s->mb_width << 6) - 4;

  1606.         Y = (s->mb_height << 6) - 4;

  1607.         if(mv1) {

  1608.             if(qx + px < -60) px = -60 - qx;

  1609.             if(qy + py < -60) py = -60 - qy;

  1610.         } else {

  1611.             if(qx + px < -28) px = -28 - qx;

  1612.             if(qy + py < -28) py = -28 - qy;

  1613.         }

  1614.         if(qx + px > X) px = X - qx;

  1615.         if(qy + py > Y) py = Y - qy;

  1616.     }

  1617.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1618.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1619.         if(is_intra[xy - wrap])

  1620.             sum = ABS(px) + ABS(py);

  1621.         else

  1622.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1623.         if(sum > 32) {

  1624.             if(get_bits1(&s->gb)) {

  1625.                 px = A[0];

  1626.                 py = A[1];

  1627.             } else {

  1628.                 px = C[0];

  1629.                 py = C[1];

  1630.             }

  1631.         } else {

  1632.             if(is_intra[xy - 1])

  1633.                 sum = ABS(px) + ABS(py);

  1634.             else

  1635.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1636.             if(sum > 32) {

  1637.                 if(get_bits1(&s->gb)) {

  1638.                     px = A[0];

  1639.                     py = A[1];

  1640.                 } else {

  1641.                     px = C[0];

  1642.                     py = C[1];

  1643.                 }

  1644.             }

  1645.         }

  1646.     }

  1647.     /* store MV using signed modulus of MV range defined in 4.11 */

  1648.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1649.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1650.     if(mv1) { /* duplicate motion data for 1-MV block */

  1651.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1652.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1653.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1654.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1655.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1656.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1657.     }

  1658. }

  1659. 

  1660. /** Reconstruct motion vector for B-frame and do motion compensation

  1661.  */

  1662. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1663. {

  1664.     MpegEncContext *s = &v->s;

  1665.     int mx[4], my[4], mv_x, mv_y;

  1666.     int i;

  1667. 

  1668.     /* scale MV difference to be quad-pel */

  1669.     dmv_x[0] <<= 1 - s->quarter_sample;

  1670.     dmv_y[0] <<= 1 - s->quarter_sample;

  1671.     dmv_x[1] <<= 1 - s->quarter_sample;

  1672.     dmv_y[1] <<= 1 - s->quarter_sample;

  1673. 

  1674.     if(direct || mode == BMV_TYPE_INTERPOLATED) {

  1675.         /* TODO */

  1676.         return;

  1677.     }

  1678. 

  1679.     if(mode == BMV_TYPE_BACKWARD) {

  1680.         for(i = 0; i < 4; i++) {

  1681.             mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];

  1682.             my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];

  1683.         }

  1684.     } else {

  1685.         for(i = 0; i < 4; i++) {

  1686.             mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];

  1687.             my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];

  1688.         }

  1689.     }

  1690. 

  1691.     /* XXX: not right but how to determine 4-MV intra/inter in another frame? */

  1692.     mv_x = median4(mx[0], mx[1], mx[2], mx[3]);

  1693.     mv_y = median4(my[0], my[1], my[2], my[3]);

  1694.     s->mv[0][0][0] = mv_x;

  1695.     s->mv[0][0][1] = mv_y;

  1696. 

  1697.     vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));

  1698. }

  1699. 

  1700. /** Get predicted DC value for I-frames only

  1701.  * prediction dir: left=0, top=1

  1702.  * @param s MpegEncContext

  1703.  * @param[in] n block index in the current MB

  1704.  * @param dc_val_ptr Pointer to DC predictor

  1705.  * @param dir_ptr Prediction direction for use in AC prediction

  1706.  */

  1707. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1708.                               int16_t **dc_val_ptr, int *dir_ptr)

  1709. {

  1710.     int a, b, c, wrap, pred, scale;

  1711.     int16_t *dc_val;

  1712.     static const uint16_t dcpred[32] = {

  1713.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1714.          114,  102,   93,   85,   79,   73,   68,   64,

  1715.           60,   57,   54,   51,   49,   47,   45,   43,

  1716.           41,   39,   38,   37,   35,   34,   33

  1717.     };

  1718. 

  1719.     /* find prediction - wmv3_dc_scale always used here in fact */

  1720.     if (n < 4)     scale = s->y_dc_scale;

  1721.     else           scale = s->c_dc_scale;

  1722. 

  1723.     wrap = s->block_wrap[n];

  1724.     dc_val= s->dc_val[0] + s->block_index[n];

  1725. 

  1726.     /* B A

  1727.      * C X

  1728.      */

  1729.     c = dc_val[ - 1];

  1730.     b = dc_val[ - 1 - wrap];

  1731.     a = dc_val[ - wrap];

  1732. 

  1733.     if (pq < 9 || !overlap)

  1734.     {

  1735.         /* Set outer values */

  1736.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  1737.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1738.     }

  1739.     else

  1740.     {

  1741.         /* Set outer values */

  1742.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  1743.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1744.     }

  1745. 

  1746.     if (abs(a - b) <= abs(b - c)) {

  1747.         pred = c;

  1748.         *dir_ptr = 1;//left

  1749.     } else {

  1750.         pred = a;

  1751.         *dir_ptr = 0;//top

  1752.     }

  1753. 

  1754.     /* update predictor */

  1755.     *dc_val_ptr = &dc_val[0];

  1756.     return pred;

  1757. }

  1758. 

  1759. 

  1760. /** Get predicted DC value

  1761.  * prediction dir: left=0, top=1

  1762.  * @param s MpegEncContext

  1763.  * @param[in] n block index in the current MB

  1764.  * @param dc_val_ptr Pointer to DC predictor

  1765.  * @param dir_ptr Prediction direction for use in AC prediction

  1766.  */

  1767. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1768.                               int a_avail, int c_avail,

  1769.                               int16_t **dc_val_ptr, int *dir_ptr)

  1770. {

  1771.     int a, b, c, wrap, pred, scale;

  1772.     int16_t *dc_val;

  1773.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1774.     int q1, q2 = 0;

  1775. 

  1776.     /* find prediction - wmv3_dc_scale always used here in fact */

  1777.     if (n < 4)     scale = s->y_dc_scale;

  1778.     else           scale = s->c_dc_scale;

  1779. 

  1780.     wrap = s->block_wrap[n];

  1781.     dc_val= s->dc_val[0] + s->block_index[n];

  1782. 

  1783.     /* B A

  1784.      * C X

  1785.      */

  1786.     c = dc_val[ - 1];

  1787.     b = dc_val[ - 1 - wrap];

  1788.     a = dc_val[ - wrap];

  1789.     /* scale predictors if needed */

  1790.     q1 = s->current_picture.qscale_table[mb_pos];

  1791.     if(c_avail && (n!= 1 && n!=3)) {

  1792.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  1793.         if(q2 && q2 != q1)

  1794.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1795.     }

  1796.     if(a_avail && (n!= 2 && n!=3)) {

  1797.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  1798.         if(q2 && q2 != q1)

  1799.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1800.     }

  1801.     if(a_avail && c_avail && (n!=3)) {

  1802.         int off = mb_pos;

  1803.         if(n != 1) off--;

  1804.         if(n != 2) off -= s->mb_stride;

  1805.         q2 = s->current_picture.qscale_table[off];

  1806.         if(q2 && q2 != q1)

  1807.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1808.     }

  1809. 

  1810.     if(a_avail && c_avail) {

  1811.         if(abs(a - b) <= abs(b - c)) {

  1812.             pred = c;

  1813.             *dir_ptr = 1;//left

  1814.         } else {

  1815.             pred = a;

  1816.             *dir_ptr = 0;//top

  1817.         }

  1818.     } else if(a_avail) {

  1819.         pred = a;

  1820.         *dir_ptr = 0;//top

  1821.     } else if(c_avail) {

  1822.         pred = c;

  1823.         *dir_ptr = 1;//left

  1824.     } else {

  1825.         pred = 0;

  1826.         *dir_ptr = 1;//left

  1827.     }

  1828. 

  1829.     /* update predictor */

  1830.     *dc_val_ptr = &dc_val[0];

  1831.     return pred;

  1832. }

  1833. 

  1834. 

  1835. /**

  1836.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1837.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1838.  * @todo TODO: Integrate to MpegEncContext facilities

  1839.  * @{

  1840.  */

  1841. 

  1842. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1843. {

  1844.     int xy, wrap, pred, a, b, c;

  1845. 

  1846.     xy = s->block_index[n];

  1847.     wrap = s->b8_stride;

  1848. 

  1849.     /* B C

  1850.      * A X

  1851.      */

  1852.     a = s->coded_block[xy - 1       ];

  1853.     b = s->coded_block[xy - 1 - wrap];

  1854.     c = s->coded_block[xy     - wrap];

  1855. 

  1856.     if (b == c) {

  1857.         pred = a;

  1858.     } else {

  1859.         pred = c;

  1860.     }

  1861. 

  1862.     /* store value */

  1863.     *coded_block_ptr = &s->coded_block[xy];

  1864. 

  1865.     return pred;

  1866. }

  1867. 

  1868. /**

  1869.  * Decode one AC coefficient

  1870.  * @param v The VC1 context

  1871.  * @param last Last coefficient

  1872.  * @param skip How much zero coefficients to skip

  1873.  * @param value Decoded AC coefficient value

  1874.  * @see 8.1.3.4

  1875.  */

  1876. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1877. {

  1878.     GetBitContext *gb = &v->s.gb;

  1879.     int index, escape, run = 0, level = 0, lst = 0;

  1880. 

  1881.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1882.     if (index != vc1_ac_sizes[codingset] - 1) {

  1883.         run = vc1_index_decode_table[codingset][index][0];

  1884.         level = vc1_index_decode_table[codingset][index][1];

  1885.         lst = index >= vc1_last_decode_table[codingset];

  1886.         if(get_bits(gb, 1))

  1887.             level = -level;

  1888.     } else {

  1889.         escape = decode210(gb);

  1890.         if (escape != 2) {

  1891.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1892.             run = vc1_index_decode_table[codingset][index][0];

  1893.             level = vc1_index_decode_table[codingset][index][1];

  1894.             lst = index >= vc1_last_decode_table[codingset];

  1895.             if(escape == 0) {

  1896.                 if(lst)

  1897.                     level += vc1_last_delta_level_table[codingset][run];

  1898.                 else

  1899.                     level += vc1_delta_level_table[codingset][run];

  1900.             } else {

  1901.                 if(lst)

  1902.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  1903.                 else

  1904.                     run += vc1_delta_run_table[codingset][level] + 1;

  1905.             }

  1906.             if(get_bits(gb, 1))

  1907.                 level = -level;

  1908.         } else {

  1909.             int sign;

  1910.             lst = get_bits(gb, 1);

  1911.             if(v->s.esc3_level_length == 0) {

  1912.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1913.                     v->s.esc3_level_length = get_bits(gb, 3);

  1914.                     if(!v->s.esc3_level_length)

  1915.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1916.                 } else { //table 60

  1917.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1918.                 }

  1919.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1920.             }

  1921.             run = get_bits(gb, v->s.esc3_run_length);

  1922.             sign = get_bits(gb, 1);

  1923.             level = get_bits(gb, v->s.esc3_level_length);

  1924.             if(sign)

  1925.                 level = -level;

  1926.         }

  1927.     }

  1928. 

  1929.     *last = lst;

  1930.     *skip = run;

  1931.     *value = level;

  1932. }

  1933. 

  1934. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1935.  * @param v VC1Context

  1936.  * @param block block to decode

  1937.  * @param coded are AC coeffs present or not

  1938.  * @param codingset set of VLC to decode data

  1939.  */

  1940. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1941. {

  1942.     GetBitContext *gb = &v->s.gb;

  1943.     MpegEncContext *s = &v->s;

  1944.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1945.     int run_diff, i;

  1946.     int16_t *dc_val;

  1947.     int16_t *ac_val, *ac_val2;

  1948.     int dcdiff;

  1949. 

  1950.     /* Get DC differential */

  1951.     if (n < 4) {

  1952.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1953.     } else {

  1954.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1955.     }

  1956.     if (dcdiff < 0){

  1957.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1958.         return -1;

  1959.     }

  1960.     if (dcdiff)

  1961.     {

  1962.         if (dcdiff == 119 /* ESC index value */)

  1963.         {

  1964.             /* TODO: Optimize */

  1965.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1966.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1967.             else dcdiff = get_bits(gb, 8);

  1968.         }

  1969.         else

  1970.         {

  1971.             if (v->pq == 1)

  1972.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1973.             else if (v->pq == 2)

  1974.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1975.         }

  1976.         if (get_bits(gb, 1))

  1977.             dcdiff = -dcdiff;

  1978.     }

  1979. 

  1980.     /* Prediction */

  1981.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1982.     *dc_val = dcdiff;

  1983. 

  1984.     /* Store the quantized DC coeff, used for prediction */

  1985.     if (n < 4) {

  1986.         block[0] = dcdiff * s->y_dc_scale;

  1987.     } else {

  1988.         block[0] = dcdiff * s->c_dc_scale;

  1989.     }

  1990.     /* Skip ? */

  1991.     run_diff = 0;

  1992.     i = 0;

  1993.     if (!coded) {

  1994.         goto not_coded;

  1995.     }

  1996. 

  1997.     //AC Decoding

  1998.     i = 1;

  1999. 

  2000.     {

  2001.         int last = 0, skip, value;

  2002.         const int8_t *zz_table;

  2003.         int scale;

  2004.         int k;

  2005. 

  2006.         scale = v->pq * 2 + v->halfpq;

  2007. 

  2008.         if(v->s.ac_pred) {

  2009.             if(!dc_pred_dir)

  2010.                 zz_table = vc1_horizontal_zz;

  2011.             else

  2012.                 zz_table = vc1_vertical_zz;

  2013.         } else

  2014.             zz_table = vc1_normal_zz;

  2015. 

  2016.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2017.         ac_val2 = ac_val;

  2018.         if(dc_pred_dir) //left

  2019.             ac_val -= 16;

  2020.         else //top

  2021.             ac_val -= 16 * s->block_wrap[n];

  2022. 

  2023.         while (!last) {

  2024.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2025.             i += skip;

  2026.             if(i > 63)

  2027.                 break;

  2028.             block[zz_table[i++]] = value;

  2029.         }

  2030. 

  2031.         /* apply AC prediction if needed */

  2032.         if(s->ac_pred) {

  2033.             if(dc_pred_dir) { //left

  2034.                 for(k = 1; k < 8; k++)

  2035.                     block[k << 3] += ac_val[k];

  2036.             } else { //top

  2037.                 for(k = 1; k < 8; k++)

  2038.                     block[k] += ac_val[k + 8];

  2039.             }

  2040.         }

  2041.         /* save AC coeffs for further prediction */

  2042.         for(k = 1; k < 8; k++) {

  2043.             ac_val2[k] = block[k << 3];

  2044.             ac_val2[k + 8] = block[k];

  2045.         }

  2046. 

  2047.         /* scale AC coeffs */

  2048.         for(k = 1; k < 64; k++)

  2049.             if(block[k]) {

  2050.                 block[k] *= scale;

  2051.                 if(!v->pquantizer)

  2052.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2053.             }

  2054. 

  2055.         if(s->ac_pred) i = 63;

  2056.     }

  2057. 

  2058. not_coded:

  2059.     if(!coded) {

  2060.         int k, scale;

  2061.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2062.         ac_val2 = ac_val;

  2063. 

  2064.         scale = v->pq * 2 + v->halfpq;

  2065.         memset(ac_val2, 0, 16 * 2);

  2066.         if(dc_pred_dir) {//left

  2067.             ac_val -= 16;

  2068.             if(s->ac_pred)

  2069.                 memcpy(ac_val2, ac_val, 8 * 2);

  2070.         } else {//top

  2071.             ac_val -= 16 * s->block_wrap[n];

  2072.             if(s->ac_pred)

  2073.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2074.         }

  2075. 

  2076.         /* apply AC prediction if needed */

  2077.         if(s->ac_pred) {

  2078.             if(dc_pred_dir) { //left

  2079.                 for(k = 1; k < 8; k++) {

  2080.                     block[k << 3] = ac_val[k] * scale;

  2081.                     if(!v->pquantizer && block[k << 3])

  2082.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2083.                 }

  2084.             } else { //top

  2085.                 for(k = 1; k < 8; k++) {

  2086.                     block[k] = ac_val[k + 8] * scale;

  2087.                     if(!v->pquantizer && block[k])

  2088.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2089.                 }

  2090.             }

  2091.             i = 63;

  2092.         }

  2093.     }

  2094.     s->block_last_index[n] = i;

  2095. 

  2096.     return 0;

  2097. }

  2098. 

  2099. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2100.  * @param v VC1Context

  2101.  * @param block block to decode

  2102.  * @param coded are AC coeffs present or not

  2103.  * @param mquant block quantizer

  2104.  * @param codingset set of VLC to decode data

  2105.  */

  2106. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2107. {

  2108.     GetBitContext *gb = &v->s.gb;

  2109.     MpegEncContext *s = &v->s;

  2110.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2111.     int run_diff, i;

  2112.     int16_t *dc_val;

  2113.     int16_t *ac_val, *ac_val2;

  2114.     int dcdiff;

  2115.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2116.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2117.     int use_pred = s->ac_pred;

  2118.     int scale;

  2119.     int q1, q2 = 0;

  2120. 

  2121.     /* XXX: Guard against dumb values of mquant */

  2122.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2123. 

  2124.     /* Set DC scale - y and c use the same */

  2125.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2126.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2127. 

  2128.     /* Get DC differential */

  2129.     if (n < 4) {

  2130.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2131.     } else {

  2132.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2133.     }

  2134.     if (dcdiff < 0){

  2135.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2136.         return -1;

  2137.     }

  2138.     if (dcdiff)

  2139.     {

  2140.         if (dcdiff == 119 /* ESC index value */)

  2141.         {

  2142.             /* TODO: Optimize */

  2143.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2144.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2145.             else dcdiff = get_bits(gb, 8);

  2146.         }

  2147.         else

  2148.         {

  2149.             if (mquant == 1)

  2150.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2151.             else if (mquant == 2)

  2152.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2153.         }

  2154.         if (get_bits(gb, 1))

  2155.             dcdiff = -dcdiff;

  2156.     }

  2157. 

  2158.     /* Prediction */

  2159.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2160.     *dc_val = dcdiff;

  2161. 

  2162.     /* Store the quantized DC coeff, used for prediction */

  2163. 

  2164.     if (n < 4) {

  2165.         block[0] = dcdiff * s->y_dc_scale;

  2166.     } else {

  2167.         block[0] = dcdiff * s->c_dc_scale;

  2168.     }

  2169.     /* Skip ? */

  2170.     run_diff = 0;

  2171.     i = 0;

  2172. 

  2173.     //AC Decoding

  2174.     i = 1;

  2175. 

  2176.     /* check if AC is needed at all and adjust direction if needed */

  2177.     if(!a_avail) dc_pred_dir = 1;

  2178.     if(!c_avail) dc_pred_dir = 0;

  2179.     if(!a_avail && !c_avail) use_pred = 0;

  2180.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2181.     ac_val2 = ac_val;

  2182. 

  2183.     scale = mquant * 2 + v->halfpq;

  2184. 

  2185.     if(dc_pred_dir) //left

  2186.         ac_val -= 16;

  2187.     else //top

  2188.         ac_val -= 16 * s->block_wrap[n];

  2189. 

  2190.     q1 = s->current_picture.qscale_table[mb_pos];

  2191.     if(dc_pred_dir && c_avail) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2192.     if(!dc_pred_dir && a_avail) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2193.     if(n && n<4) q2 = q1;

  2194. 

  2195.     if(coded) {

  2196.         int last = 0, skip, value;

  2197.         const int8_t *zz_table;

  2198.         int k;

  2199. 

  2200.         zz_table = vc1_simple_progressive_8x8_zz;

  2201. 

  2202.         while (!last) {

  2203.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2204.             i += skip;

  2205.             if(i > 63)

  2206.                 break;

  2207.             block[zz_table[i++]] = value;

  2208.         }

  2209. 

  2210.         /* apply AC prediction if needed */

  2211.         if(use_pred) {

  2212.             /* scale predictors if needed*/

  2213.             if(q2 && q1!=q2) {

  2214.                 q1 = q1 * 2 - 1;

  2215.                 q2 = q2 * 2 - 1;

  2216. 

  2217.                 if(dc_pred_dir) { //left

  2218.                     for(k = 1; k < 8; k++)

  2219.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2220.                 } else { //top

  2221.                     for(k = 1; k < 8; k++)

  2222.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2223.                 }

  2224.             } else {

  2225.                 if(dc_pred_dir) { //left

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

  2227.                         block[k << 3] += ac_val[k];

  2228.                 } else { //top

  2229.                     for(k = 1; k < 8; k++)

  2230.                         block[k] += ac_val[k + 8];

  2231.                 }

  2232.             }

  2233.         }

  2234.         /* save AC coeffs for further prediction */

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

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

  2237.             ac_val2[k + 8] = block[k];

  2238.         }

  2239. 

  2240.         /* scale AC coeffs */

  2241.         for(k = 1; k < 64; k++)

  2242.             if(block[k]) {

  2243.                 block[k] *= scale;

  2244.                 if(!v->pquantizer)

  2245.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2246.             }

  2247. 

  2248.         if(use_pred) i = 63;

  2249.     } else { // no AC coeffs

  2250.         int k;

  2251. 

  2252.         memset(ac_val2, 0, 16 * 2);

  2253.         if(dc_pred_dir) {//left

  2254.             if(use_pred) {

  2255.                 memcpy(ac_val2, ac_val, 8 * 2);

  2256.                 if(q2 && q1!=q2) {

  2257.                     q1 = q1 * 2 - 1;

  2258.                     q2 = q2 * 2 - 1;

  2259.                     for(k = 1; k < 8; k++)

  2260.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2261.                 }

  2262.             }

  2263.         } else {//top

  2264.             if(use_pred) {

  2265.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2266.                 if(q2 && q1!=q2) {

  2267.                     q1 = q1 * 2 - 1;

  2268.                     q2 = q2 * 2 - 1;

  2269.                     for(k = 1; k < 8; k++)

  2270.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2271.                 }

  2272.             }

  2273.         }

  2274. 

  2275.         /* apply AC prediction if needed */

  2276.         if(use_pred) {

  2277.             if(dc_pred_dir) { //left

  2278.                 for(k = 1; k < 8; k++) {

  2279.                     block[k << 3] = ac_val2[k] * scale;

  2280.                     if(!v->pquantizer && block[k << 3])

  2281.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2282.                 }

  2283.             } else { //top

  2284.                 for(k = 1; k < 8; k++) {

  2285.                     block[k] = ac_val2[k + 8] * scale;

  2286.                     if(!v->pquantizer && block[k])

  2287.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2288.                 }

  2289.             }

  2290.             i = 63;

  2291.         }

  2292.     }

  2293.     s->block_last_index[n] = i;

  2294. 

  2295.     return 0;

  2296. }

  2297. 

  2298. /** Decode P block

  2299.  */

  2300. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2301. {

  2302.     MpegEncContext *s = &v->s;

  2303.     GetBitContext *gb = &s->gb;

  2304.     int i, j;

  2305.     int subblkpat = 0;

  2306.     int scale, off, idx, last, skip, value;

  2307.     int ttblk = ttmb & 7;

  2308. 

  2309.     if(ttmb == -1) {

  2310.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2311.     }

  2312.     if(ttblk == TT_4X4) {

  2313.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2314.     }

  2315.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2316.         subblkpat = decode012(gb);

  2317.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2318.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2319.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2320.     }

  2321.     scale = 2 * mquant + v->halfpq;

  2322. 

  2323.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2324.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2325.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2326.         ttblk = TT_8X4;

  2327.     }

  2328.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2329.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2330.         ttblk = TT_4X8;

  2331.     }

  2332.     switch(ttblk) {

  2333.     case TT_8X8:

  2334.         i = 0;

  2335.         last = 0;

  2336.         while (!last) {

  2337.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2338.             i += skip;

  2339.             if(i > 63)

  2340.                 break;

  2341.             idx = vc1_simple_progressive_8x8_zz[i++];

  2342.             block[idx] = value * scale;

  2343.             if(!v->pquantizer)

  2344.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2345.         }

  2346.         s->dsp.vc1_inv_trans_8x8(block);

  2347.         break;

  2348.     case TT_4X4:

  2349.         for(j = 0; j < 4; j++) {

  2350.             last = subblkpat & (1 << (3 - j));

  2351.             i = 0;

  2352.             off = (j & 1) * 4 + (j & 2) * 16;

  2353.             while (!last) {

  2354.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2355.                 i += skip;

  2356.                 if(i > 15)

  2357.                     break;

  2358.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2359.                 block[idx + off] = value * scale;

  2360.                 if(!v->pquantizer)

  2361.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2362.             }

  2363.             if(!(subblkpat & (1 << (3 - j))))

  2364.                 s->dsp.vc1_inv_trans_4x4(block, j);

  2365.         }

  2366.         break;

  2367.     case TT_8X4:

  2368.         for(j = 0; j < 2; j++) {

  2369.             last = subblkpat & (1 << (1 - j));

  2370.             i = 0;

  2371.             off = j * 32;

  2372.             while (!last) {

  2373.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2374.                 i += skip;

  2375.                 if(i > 31)

  2376.                     break;

  2377.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2378.                 block[idx + off] = value * scale;

  2379.                 if(!v->pquantizer)

  2380.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2381.             }

  2382.             if(!(subblkpat & (1 << (1 - j))))

  2383.                 s->dsp.vc1_inv_trans_8x4(block, j);

  2384.         }

  2385.         break;

  2386.     case TT_4X8:

  2387.         for(j = 0; j < 2; j++) {

  2388.             last = subblkpat & (1 << (1 - j));

  2389.             i = 0;

  2390.             off = j * 4;

  2391.             while (!last) {

  2392.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2393.                 i += skip;

  2394.                 if(i > 31)

  2395.                     break;

  2396.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2397.                 block[idx + off] = value * scale;

  2398.                 if(!v->pquantizer)

  2399.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2400.             }

  2401.             if(!(subblkpat & (1 << (1 - j))))

  2402.                 s->dsp.vc1_inv_trans_4x8(block, j);

  2403.         }

  2404.         break;

  2405.     }

  2406.     return 0;

  2407. }

  2408. 

  2409. 

  2410. /** Decode one P-frame MB (in Simple/Main profile)

  2411.  * @todo TODO: Extend to AP

  2412.  * @fixme FIXME: DC value for inter blocks not set

  2413.  */

  2414. static int vc1_decode_p_mb(VC1Context *v)

  2415. {

  2416.     MpegEncContext *s = &v->s;

  2417.     GetBitContext *gb = &s->gb;

  2418.     int i, j;

  2419.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2420.     int cbp; /* cbp decoding stuff */

  2421.     int mqdiff, mquant; /* MB quantization */

  2422.     int ttmb = v->ttfrm; /* MB Transform type */

  2423.     int status;

  2424. 

  2425.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2426.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2427.     int mb_has_coeffs = 1; /* last_flag */

  2428.     int dmv_x, dmv_y; /* Differential MV components */

  2429.     int index, index1; /* LUT indices */

  2430.     int val, sign; /* temp values */

  2431.     int first_block = 1;

  2432.     int dst_idx, off;

  2433.     int skipped, fourmv;

  2434. 

  2435.     mquant = v->pq; /* Loosy initialization */

  2436. 

  2437.     if (v->mv_type_is_raw)

  2438.         fourmv = get_bits1(gb);

  2439.     else

  2440.         fourmv = v->mv_type_mb_plane[mb_pos];

  2441.     if (v->skip_is_raw)

  2442.         skipped = get_bits1(gb);

  2443.     else

  2444.         skipped = v->s.mbskip_table[mb_pos];

  2445. 

  2446.     s->dsp.clear_blocks(s->block[0]);

  2447. 

  2448.     if (!fourmv) /* 1MV mode */

  2449.     {

  2450.         if (!skipped)

  2451.         {

  2452.             GET_MVDATA(dmv_x, dmv_y);

  2453. 

  2454.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2455.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  2456. 

  2457.             /* FIXME Set DC val for inter block ? */

  2458.             if (s->mb_intra && !mb_has_coeffs)

  2459.             {

  2460.                 GET_MQUANT();

  2461.                 s->ac_pred = get_bits(gb, 1);

  2462.                 cbp = 0;

  2463.             }

  2464.             else if (mb_has_coeffs)

  2465.             {

  2466.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2467.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2468.                 GET_MQUANT();

  2469.             }

  2470.             else

  2471.             {

  2472.                 mquant = v->pq;

  2473.                 cbp = 0;

  2474.             }

  2475.             s->current_picture.qscale_table[mb_pos] = mquant;

  2476. 

  2477.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2478.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2479.                                 VC1_TTMB_VLC_BITS, 2);

  2480.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  2481.             dst_idx = 0;

  2482.             for (i=0; i<6; i++)

  2483.             {

  2484.                 s->dc_val[0][s->block_index[i]] = 0;

  2485.                 dst_idx += i >> 2;

  2486.                 val = ((cbp >> (5 - i)) & 1);

  2487.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2488.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2489.                 if(s->mb_intra) {

  2490.                     /* check if prediction blocks A and C are available */

  2491.                     v->a_avail = v->c_avail = 0;

  2492.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2493.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2494.                     if(i == 1 || i == 3 || s->mb_x)

  2495.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2496. 

  2497.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2498.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2499.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2500.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2501.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2502.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2503.                     /* TODO: proper loop filtering */

  2504.                     if(v->pq >= 9 && v->overlap) {

  2505.                         if(v->a_avail)

  2506.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? ((i&1)>>1) : (s->mb_y&1));

  2507.                         if(v->c_avail)

  2508.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? (i&1) : (s->mb_x&1));

  2509.                     }

  2510.                 } else if(val) {

  2511.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2512.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2513.                     first_block = 0;

  2514.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2515.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2516.                 }

  2517.             }

  2518.         }

  2519.         else //Skipped

  2520.         {

  2521.             s->mb_intra = 0;

  2522.             for(i = 0; i < 6; i++) {

  2523.                 v->mb_type[0][s->block_index[i]] = 0;

  2524.                 s->dc_val[0][s->block_index[i]] = 0;

  2525.             }

  2526.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2527.             s->current_picture.qscale_table[mb_pos] = 0;

  2528.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  2529.             vc1_mc_1mv(v, 0);

  2530.             return 0;

  2531.         }

  2532.     } //1MV mode

  2533.     else //4MV mode

  2534.     {

  2535.         if (!skipped /* unskipped MB */)

  2536.         {

  2537.             int intra_count = 0, coded_inter = 0;

  2538.             int is_intra[6], is_coded[6];

  2539.             /* Get CBPCY */

  2540.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2541.             for (i=0; i<6; i++)

  2542.             {

  2543.                 val = ((cbp >> (5 - i)) & 1);

  2544.                 s->dc_val[0][s->block_index[i]] = 0;

  2545.                 s->mb_intra = 0;

  2546.                 if(i < 4) {

  2547.                     dmv_x = dmv_y = 0;

  2548.                     s->mb_intra = 0;

  2549.                     mb_has_coeffs = 0;

  2550.                     if(val) {

  2551.                         GET_MVDATA(dmv_x, dmv_y);

  2552.                     }

  2553.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  2554.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  2555.                     intra_count += s->mb_intra;

  2556.                     is_intra[i] = s->mb_intra;

  2557.                     is_coded[i] = mb_has_coeffs;

  2558.                 }

  2559.                 if(i&4){

  2560.                     is_intra[i] = (intra_count >= 3);

  2561.                     is_coded[i] = val;

  2562.                 }

  2563.                 if(i == 4) vc1_mc_4mv_chroma(v);

  2564.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  2565.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  2566.             }

  2567.             // if there are no coded blocks then don't do anything more

  2568.             if(!intra_count && !coded_inter) return 0;

  2569.             dst_idx = 0;

  2570.             GET_MQUANT();

  2571.             s->current_picture.qscale_table[mb_pos] = mquant;

  2572.             /* test if block is intra and has pred */

  2573.             {

  2574.                 int intrapred = 0;

  2575.                 for(i=0; i<6; i++)

  2576.                     if(is_intra[i]) {

  2577.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  2578.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  2579.                             intrapred = 1;

  2580.                             break;

  2581.                         }

  2582.                     }

  2583.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  2584.                 else s->ac_pred = 0;

  2585.             }

  2586.             if (!v->ttmbf && coded_inter)

  2587.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2588.             for (i=0; i<6; i++)

  2589.             {

  2590.                 dst_idx += i >> 2;

  2591.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2592.                 s->mb_intra = is_intra[i];

  2593.                 if (is_intra[i]) {

  2594.                     /* check if prediction blocks A and C are available */

  2595.                     v->a_avail = v->c_avail = 0;

  2596.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2597.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2598.                     if(i == 1 || i == 3 || s->mb_x)

  2599.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2600. 

  2601.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  2602.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2603.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2604.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2605.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2606.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2607.                     /* TODO: proper loop filtering */

  2608.                     if(v->pq >= 9 && v->overlap) {

  2609.                         if(v->a_avail)

  2610.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? ((i&1)>>1) : (s->mb_y&1));

  2611.                         if(v->c_avail)

  2612.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? (i&1) : (s->mb_x&1));

  2613.                     }

  2614.                 } else if(is_coded[i]) {

  2615.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2616.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2617.                     first_block = 0;

  2618.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2619.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2620.                 }

  2621.             }

  2622.             return status;

  2623.         }

  2624.         else //Skipped MB

  2625.         {

  2626.             s->mb_intra = 0;

  2627.             s->current_picture.qscale_table[mb_pos] = 0;

  2628.             for (i=0; i<6; i++) {

  2629.                 v->mb_type[0][s->block_index[i]] = 0;

  2630.                 s->dc_val[0][s->block_index[i]] = 0;

  2631.             }

  2632.             for (i=0; i<4; i++)

  2633.             {

  2634.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  2635.                 vc1_mc_4mv_luma(v, i);

  2636.             }

  2637.             vc1_mc_4mv_chroma(v);

  2638.             s->current_picture.qscale_table[mb_pos] = 0;

  2639.             return 0;

  2640.         }

  2641.     }

  2642. 

  2643.     /* Should never happen */

  2644.     return -1;

  2645. }

  2646. 

  2647. /** Decode one B-frame MB (in Main profile)

  2648.  */

  2649. static void vc1_decode_b_mb(VC1Context *v)

  2650. {

  2651.     MpegEncContext *s = &v->s;

  2652.     GetBitContext *gb = &s->gb;

  2653.     int i, j;

  2654.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2655.     int cbp; /* cbp decoding stuff */

  2656.     int mqdiff, mquant; /* MB quantization */

  2657.     int ttmb = v->ttfrm; /* MB Transform type */

  2658. 

  2659.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2660.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2661.     int mb_has_coeffs = 0; /* last_flag */

  2662.     int index, index1; /* LUT indices */

  2663.     int val, sign; /* temp values */

  2664.     int first_block = 1;

  2665.     int dst_idx, off;

  2666.     int skipped, direct;

  2667.     int dmv_x[2], dmv_y[2];

  2668.     int bmvtype = BMV_TYPE_BACKWARD; /* XXX: is it so? */

  2669. 

  2670.     mquant = v->pq; /* Loosy initialization */

  2671.     s->mb_intra = 0;

  2672. 

  2673.     if (v->dmb_is_raw)

  2674.         direct = get_bits1(gb);

  2675.     else

  2676.         direct = v->direct_mb_plane[mb_pos];

  2677.     if (v->skip_is_raw)

  2678.         skipped = get_bits1(gb);

  2679.     else

  2680.         skipped = v->s.mbskip_table[mb_pos];

  2681. 

  2682.     s->dsp.clear_blocks(s->block[0]);

  2683.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  2684.     for(i = 0; i < 6; i++) {

  2685.         v->mb_type[0][s->block_index[i]] = 0;

  2686.         s->dc_val[0][s->block_index[i]] = 0;

  2687.     }

  2688.     s->current_picture.qscale_table[mb_pos] = 0;

  2689. 

  2690.     if (!direct) {

  2691.         if (!skipped) {

  2692.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  2693.         }

  2694.         if(skipped || !s->mb_intra) {

  2695.             bmvtype = decode012(gb);

  2696.             switch(bmvtype) {

  2697.             case 0:

  2698.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  2699.                 break;

  2700.             case 1:

  2701.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  2702.                 break;

  2703.             case 2:

  2704.                 bmvtype = BMV_TYPE_INTERPOLATED;

  2705.             }

  2706.         }

  2707.     }

  2708. 

  2709.     if (skipped) {

  2710.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2711.         return;

  2712.     }

  2713.     if (direct) {

  2714.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2715.         GET_MQUANT();

  2716.         s->current_picture.qscale_table[mb_pos] = mquant;

  2717.         if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2718.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2719.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2720.     } else {

  2721.         if(!mb_has_coeffs && !s->mb_intra) {

  2722.             /* no coded blocks - effectively skipped */

  2723.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2724.             return;

  2725.         }

  2726.         if(s->mb_intra && !mb_has_coeffs) {

  2727.             GET_MQUANT();

  2728.             s->current_picture.qscale_table[mb_pos] = mquant;

  2729.             s->ac_pred = get_bits1(gb);

  2730.             cbp = 0;

  2731.         } else {

  2732.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  2733.                 GET_MVDATA(dmv_x[1], dmv_y[1]);

  2734.                 if(!mb_has_coeffs) {

  2735.                     /* interpolated skipped block */

  2736.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2737.                     return;

  2738.                 }

  2739.             }

  2740.             if(!s->mb_intra)

  2741.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2742.             if(s->mb_intra)

  2743.                 s->ac_pred = get_bits1(gb);

  2744.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2745.             GET_MQUANT();

  2746.             s->current_picture.qscale_table[mb_pos] = mquant;

  2747.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2748.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2749.         }

  2750.     }

  2751.     dst_idx = 0;

  2752.     for (i=0; i<6; i++)

  2753.     {

  2754.         s->dc_val[0][s->block_index[i]] = 0;

  2755.         dst_idx += i >> 2;

  2756.         val = ((cbp >> (5 - i)) & 1);

  2757.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2758.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2759.         if(s->mb_intra) {

  2760.             /* check if prediction blocks A and C are available */

  2761.             v->a_avail = v->c_avail = 0;

  2762.             if(i == 2 || i == 3 || !s->first_slice_line)

  2763.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2764.             if(i == 1 || i == 3 || s->mb_x)

  2765.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2766. 

  2767.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2768.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2769.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2770.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2771.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2772.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2773.             /* TODO: proper loop filtering */

  2774.             if(v->pq >= 9 && v->overlap) {

  2775.                 if(v->a_avail)

  2776.                     s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? ((i&1)>>1) : (s->mb_y&1));

  2777.                 if(v->c_avail)

  2778.                     s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? (i&1) : (s->mb_x&1));

  2779.             }

  2780.         } else if(val) {

  2781.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2782.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2783.             first_block = 0;

  2784.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2785.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2786.         }

  2787.     }

  2788. }

  2789. 

  2790. /** Decode blocks of I-frame

  2791.  */

  2792. static void vc1_decode_i_blocks(VC1Context *v)

  2793. {

  2794.     int k, j;

  2795.     MpegEncContext *s = &v->s;

  2796.     int cbp, val;

  2797.     uint8_t *coded_val;

  2798.     int mb_pos;

  2799. 

  2800.     /* select codingmode used for VLC tables selection */

  2801.     switch(v->y_ac_table_index){

  2802.     case 0:

  2803.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2804.         break;

  2805.     case 1:

  2806.         v->codingset = CS_HIGH_MOT_INTRA;

  2807.         break;

  2808.     case 2:

  2809.         v->codingset = CS_MID_RATE_INTRA;

  2810.         break;

  2811.     }

  2812. 

  2813.     switch(v->c_ac_table_index){

  2814.     case 0:

  2815.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2816.         break;

  2817.     case 1:

  2818.         v->codingset2 = CS_HIGH_MOT_INTER;

  2819.         break;

  2820.     case 2:

  2821.         v->codingset2 = CS_MID_RATE_INTER;

  2822.         break;

  2823.     }

  2824. 

  2825.     /* Set DC scale - y and c use the same */

  2826.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2827.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2828. 

  2829.     //do frame decode

  2830.     s->mb_x = s->mb_y = 0;

  2831.     s->mb_intra = 1;

  2832.     s->first_slice_line = 1;

  2833.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2834.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2835.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2836.             ff_init_block_index(s);

  2837.             ff_update_block_index(s);

  2838.             s->dsp.clear_blocks(s->block[0]);

  2839.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2840.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2841.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2842. 

  2843.             // do actual MB decoding and displaying

  2844.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2845.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2846. 

  2847.             for(k = 0; k < 6; k++) {

  2848.                 val = ((cbp >> (5 - k)) & 1);

  2849. 

  2850.                 if (k < 4) {

  2851.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2852.                     val = val ^ pred;

  2853.                     *coded_val = val;

  2854.                 }

  2855.                 cbp |= val << (5 - k);

  2856. 

  2857.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2858. 

  2859.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  2860.                 if(v->pq >= 9 && v->overlap) {

  2861.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  2862.                 }

  2863.             }

  2864. 

  2865.             vc1_put_block(v, s->block);

  2866.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2867.                 if(!s->first_slice_line) {

  2868.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize, 0);

  2869.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize, 0);

  2870.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  2871.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize, s->mb_y&1);

  2872.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize, s->mb_y&1);

  2873.                     }

  2874.                 }

  2875.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize, 1);

  2876.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize, 1);

  2877.                 if(s->mb_x) {

  2878.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize, 0);

  2879.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize, 0);

  2880.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  2881.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize, s->mb_x&1);

  2882.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize, s->mb_x&1);

  2883.                     }

  2884.                 }

  2885.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize, 1);

  2886.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize, 1);

  2887.             }

  2888. 

  2889.             if(get_bits_count(&s->gb) > v->bits) {

  2890.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2891.                 return;

  2892.             }

  2893.         }

  2894.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2895.         s->first_slice_line = 0;

  2896.     }

  2897. }

  2898. 

  2899. static void vc1_decode_p_blocks(VC1Context *v)

  2900. {

  2901.     MpegEncContext *s = &v->s;

  2902. 

  2903.     /* select codingmode used for VLC tables selection */

  2904.     switch(v->c_ac_table_index){

  2905.     case 0:

  2906.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2907.         break;

  2908.     case 1:

  2909.         v->codingset = CS_HIGH_MOT_INTRA;

  2910.         break;

  2911.     case 2:

  2912.         v->codingset = CS_MID_RATE_INTRA;

  2913.         break;

  2914.     }

  2915. 

  2916.     switch(v->c_ac_table_index){

  2917.     case 0:

  2918.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2919.         break;

  2920.     case 1:

  2921.         v->codingset2 = CS_HIGH_MOT_INTER;

  2922.         break;

  2923.     case 2:

  2924.         v->codingset2 = CS_MID_RATE_INTER;

  2925.         break;

  2926.     }

  2927. 

  2928.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2929.     s->first_slice_line = 1;

  2930.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2931.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2932.             ff_init_block_index(s);

  2933.             ff_update_block_index(s);

  2934.             s->dsp.clear_blocks(s->block[0]);

  2935. 

  2936.             vc1_decode_p_mb(v);

  2937.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2938.                 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);

  2939.                 return;

  2940.             }

  2941.         }

  2942.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2943.         s->first_slice_line = 0;

  2944.     }

  2945. }

  2946. 

  2947. static void vc1_decode_b_blocks(VC1Context *v)

  2948. {

  2949.     MpegEncContext *s = &v->s;

  2950. 

  2951.     /* select codingmode used for VLC tables selection */

  2952.     switch(v->c_ac_table_index){

  2953.     case 0:

  2954.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2955.         break;

  2956.     case 1:

  2957.         v->codingset = CS_HIGH_MOT_INTRA;

  2958.         break;

  2959.     case 2:

  2960.         v->codingset = CS_MID_RATE_INTRA;

  2961.         break;

  2962.     }

  2963. 

  2964.     switch(v->c_ac_table_index){

  2965.     case 0:

  2966.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2967.         break;

  2968.     case 1:

  2969.         v->codingset2 = CS_HIGH_MOT_INTER;

  2970.         break;

  2971.     case 2:

  2972.         v->codingset2 = CS_MID_RATE_INTER;

  2973.         break;

  2974.     }

  2975. 

  2976.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2977.     s->first_slice_line = 1;

  2978.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2979.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2980.             ff_init_block_index(s);

  2981.             ff_update_block_index(s);

  2982.             s->dsp.clear_blocks(s->block[0]);

  2983. 

  2984.             vc1_decode_b_mb(v);

  2985.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2986.                 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);

  2987.                 return;

  2988.             }

  2989.         }

  2990.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2991.         s->first_slice_line = 0;

  2992.     }

  2993. }

  2994. 

  2995. static void vc1_decode_blocks(VC1Context *v)

  2996. {

  2997. 

  2998.     v->s.esc3_level_length = 0;

  2999. 

  3000.     switch(v->s.pict_type) {

  3001.     case I_TYPE:

  3002.         vc1_decode_i_blocks(v);

  3003.         break;

  3004.     case P_TYPE:

  3005.         vc1_decode_p_blocks(v);

  3006.         break;

  3007.     case B_TYPE:

  3008.         vc1_decode_b_blocks(v);

  3009.         break;

  3010.     }

  3011. }

  3012. 

  3013. 

  3014. /** Initialize a VC1/WMV3 decoder

  3015.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3016.  * @todo TODO: Decypher remaining bits in extra_data

  3017.  */

  3018. static int vc1_decode_init(AVCodecContext *avctx)

  3019. {

  3020.     VC1Context *v = avctx->priv_data;

  3021.     MpegEncContext *s = &v->s;

  3022.     GetBitContext gb;

  3023. 

  3024.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3025.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3026.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3027.     else

  3028.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3029.     v->s.avctx = avctx;

  3030.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3031.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3032. 

  3033.     if(ff_h263_decode_init(avctx) < 0)

  3034.         return -1;

  3035.     if (vc1_init_common(v) < 0) return -1;

  3036. 

  3037.     avctx->coded_width = avctx->width;

  3038.     avctx->coded_height = avctx->height;

  3039.     if (avctx->codec_id == CODEC_ID_WMV3)

  3040.     {

  3041.         int count = 0;

  3042. 

  3043.         // looks like WMV3 has a sequence header stored in the extradata

  3044.         // advanced sequence header may be before the first frame

  3045.         // the last byte of the extradata is a version number, 1 for the

  3046.         // samples we can decode

  3047. 

  3048.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3049. 

  3050.         if (decode_sequence_header(avctx, &gb) < 0)

  3051.           return -1;

  3052. 

  3053.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3054.         if (count>0)

  3055.         {

  3056.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3057.                    count, get_bits(&gb, count));

  3058.         }

  3059.         else if (count < 0)

  3060.         {

  3061.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3062.         }

  3063.     }

  3064.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3065. 

  3066.     s->mb_width = (avctx->coded_width+15)>>4;

  3067.     s->mb_height = (avctx->coded_height+15)>>4;

  3068. 

  3069.     /* Allocate mb bitplanes */

  3070.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3071.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3072. 

  3073.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3074.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3075.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3076.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3077.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3078. 

  3079.     /* Init coded blocks info */

  3080.     if (v->profile == PROFILE_ADVANCED)

  3081.     {

  3082. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3083. //            return -1;

  3084. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3085. //            return -1;

  3086.     }

  3087. 

  3088.     return 0;

  3089. }

  3090. 

  3091. 

  3092. /** Decode a VC1/WMV3 frame

  3093.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3094.  * @warning Initial try at using MpegEncContext stuff

  3095.  */

  3096. static int vc1_decode_frame(AVCodecContext *avctx,

  3097.                             void *data, int *data_size,

  3098.                             uint8_t *buf, int buf_size)

  3099. {

  3100.     VC1Context *v = avctx->priv_data;

  3101.     MpegEncContext *s = &v->s;

  3102.     AVFrame *pict = data;

  3103. 

  3104.     /* no supplementary picture */

  3105.     if (buf_size == 0) {

  3106.         /* special case for last picture */

  3107.         if (s->low_delay==0 && s->next_picture_ptr) {

  3108.             *pict= *(AVFrame*)s->next_picture_ptr;

  3109.             s->next_picture_ptr= NULL;

  3110. 

  3111.             *data_size = sizeof(AVFrame);

  3112.         }

  3113. 

  3114.         return 0;

  3115.     }

  3116. 

  3117.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  3118.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  3119.         int i= ff_find_unused_picture(s, 0);

  3120.         s->current_picture_ptr= &s->picture[i];

  3121.     }

  3122. 

  3123.     avctx->has_b_frames= !s->low_delay;

  3124. 

  3125.     init_get_bits(&s->gb, buf, buf_size*8);

  3126.     // do parse frame header

  3127.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  3128.         return -1;

  3129. 

  3130.     if(s->pict_type != I_TYPE && !v->res_rtm_flag)return -1;

  3131. 

  3132.     // for hurry_up==5

  3133.     s->current_picture.pict_type= s->pict_type;

  3134.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  3135. 

  3136.     /* skip B-frames if we don't have reference frames */

  3137.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  3138.     /* skip b frames if we are in a hurry */

  3139.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  3140.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  3141.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  3142.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  3143.         return buf_size;

  3144.     /* skip everything if we are in a hurry>=5 */

  3145.     if(avctx->hurry_up>=5) return -1;//buf_size;

  3146. 

  3147.     if(s->next_p_frame_damaged){

  3148.         if(s->pict_type==B_TYPE)

  3149.             return buf_size;

  3150.         else

  3151.             s->next_p_frame_damaged=0;

  3152.     }

  3153. 

  3154.     if(MPV_frame_start(s, avctx) < 0)

  3155.         return -1;

  3156. 

  3157.     ff_er_frame_start(s);

  3158. 

  3159.     v->bits = buf_size * 8;

  3160.     vc1_decode_blocks(v);

  3161. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  3162. //  if(get_bits_count(&s->gb) > buf_size * 8)

  3163. //      return -1;

  3164.     ff_er_frame_end(s);

  3165. 

  3166.     MPV_frame_end(s);

  3167. 

  3168. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  3169. assert(s->current_picture.pict_type == s->pict_type);

  3170.     if (s->pict_type == B_TYPE || s->low_delay) {

  3171.         *pict= *(AVFrame*)s->current_picture_ptr;

  3172.     } else if (s->last_picture_ptr != NULL) {

  3173.         *pict= *(AVFrame*)s->last_picture_ptr;

  3174.     }

  3175. 

  3176.     if(s->last_picture_ptr || s->low_delay){

  3177.         *data_size = sizeof(AVFrame);

  3178.         ff_print_debug_info(s, pict);

  3179.     }

  3180. 

  3181.     /* Return the Picture timestamp as the frame number */

  3182.     /* we substract 1 because it is added on utils.c    */

  3183.     avctx->frame_number = s->picture_number - 1;

  3184. 

  3185.     return buf_size;

  3186. }

  3187. 

  3188. 

  3189. /** Close a VC1/WMV3 decoder

  3190.  * @warning Initial try at using MpegEncContext stuff

  3191.  */

  3192. static int vc1_decode_end(AVCodecContext *avctx)

  3193. {

  3194.     VC1Context *v = avctx->priv_data;

  3195. 

  3196.     av_freep(&v->hrd_rate);

  3197.     av_freep(&v->hrd_buffer);

  3198.     MPV_common_end(&v->s);

  3199.     av_freep(&v->mv_type_mb_plane);

  3200.     av_freep(&v->direct_mb_plane);

  3201.     av_freep(&v->mb_type_base);

  3202.     return 0;

  3203. }

  3204. 

  3205. 

  3206. AVCodec vc1_decoder = {

  3207.     "vc1",

  3208.     CODEC_TYPE_VIDEO,

  3209.     CODEC_ID_VC1,

  3210.     sizeof(VC1Context),

  3211.     vc1_decode_init,

  3212.     NULL,

  3213.     vc1_decode_end,

  3214.     vc1_decode_frame,

  3215.     CODEC_CAP_DELAY,

  3216.     NULL

  3217. };

  3218. 

  3219. AVCodec wmv3_decoder = {

  3220.     "wmv3",

  3221.     CODEC_TYPE_VIDEO,

  3222.     CODEC_ID_WMV3,

  3223.     sizeof(VC1Context),

  3224.     vc1_decode_init,

  3225.     NULL,

  3226.     vc1_decode_end,

  3227.     vc1_decode_frame,

  3228.     CODEC_CAP_DELAY,

  3229.     NULL

  3230. };