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.
6482 Commits
32 Branches
375MB
Tree: 66ff2c1f52
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '66ff2c1f52'
${ noResults }
FFmpeg/libavcodec/vc1.c

3357 lines
113KB
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

  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 { // hpel mc - always used for luma

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

  872. 

  873.         if(!v->rnd)

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

  875.         else

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

  877.     }

  878. 

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

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

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

  882.     if(!v->rnd){

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

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

  885.     }else{

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

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

  888.     }

  889. }

  890. 

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

  892.  */

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

  894. {

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

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

  897.     uint8_t *srcY;

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

  899.     int off;

  900. 

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

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

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

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

  905. 

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

  907. 

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

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

  910. 

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

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

  913. 

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

  915. 

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

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

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

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

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

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

  922.         srcY = s->edge_emu_buffer;

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

  924.         if(v->rangeredfrm) {

  925.             int i, j;

  926.             uint8_t *src;

  927. 

  928.             src = srcY;

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

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

  931.                 src += s->linesize;

  932.             }

  933.         }

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

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

  936.             int i, j;

  937.             uint8_t *src;

  938. 

  939.             src = srcY;

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

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

  942.                 src += s->linesize;

  943.             }

  944.         }

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

  946.     }

  947. 

  948.     if(s->mspel) {

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

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

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

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

  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.     }

  958. }

  959. 

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

  961. {

  962.     if(a < b) {

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

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

  965.     } else {

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

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

  968.     }

  969. }

  970. 

  971. 

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

  973.  */

  974. static void vc1_mc_4mv_chroma(VC1Context *v)

  975. {

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

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

  978.     uint8_t *srcU, *srcV;

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

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

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

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

  983. 

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

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

  986. 

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

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

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

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

  991.     }

  992. 

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

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

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

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

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

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

  999.         switch(idx) {

  1000.         case 0x1:

  1001.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1002.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1003.             break;

  1004.         case 0x2:

  1005.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1006.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1007.             break;

  1008.         case 0x4:

  1009.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1010.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1011.             break;

  1012.         case 0x8:

  1013.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1014.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1015.             break;

  1016.         }

  1017.     } else if(count[idx] == 2) {

  1018.         int t1 = 0, t2 = 0;

  1019.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1020.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1021.         tx = (mvx[t1] + mvx[t2]) / 2;

  1022.         ty = (mvy[t1] + mvy[t2]) / 2;

  1023.     } else

  1024.         return; //no need to do MC for inter blocks

  1025. 

  1026.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1027.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1028. 

  1029.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1030.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1031. 

  1032.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  1033.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  1034.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1035.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1036.     if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1037.        || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  1038.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){

  1039.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1040.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1041.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1042.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1043.         srcU = s->edge_emu_buffer;

  1044.         srcV = s->edge_emu_buffer + 16;

  1045. 

  1046.         /* if we deal with range reduction we need to scale source blocks */

  1047.         if(v->rangeredfrm) {

  1048.             int i, j;

  1049.             uint8_t *src, *src2;

  1050. 

  1051.             src = srcU; src2 = srcV;

  1052.             for(j = 0; j < 9; j++) {

  1053.                 for(i = 0; i < 9; i++) {

  1054.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1055.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1056.                 }

  1057.                 src += s->uvlinesize;

  1058.                 src2 += s->uvlinesize;

  1059.             }

  1060.         }

  1061.         /* if we deal with intensity compensation we need to scale source blocks */

  1062.         if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1063.             int i, j;

  1064.             uint8_t *src, *src2;

  1065. 

  1066.             src = srcU; src2 = srcV;

  1067.             for(j = 0; j < 9; j++) {

  1068.                 for(i = 0; i < 9; i++) {

  1069.                     src[i] = v->lutuv[src[i]];

  1070.                     src2[i] = v->lutuv[src2[i]];

  1071.                 }

  1072.                 src += s->uvlinesize;

  1073.                 src2 += s->uvlinesize;

  1074.             }

  1075.         }

  1076.     }

  1077. 

  1078.     if(v->fastuvmc) {

  1079.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1080.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1081.     }

  1082. 

  1083.     /* Chroma MC always uses qpel blilinear */

  1084.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1085.     if(!v->rnd){

  1086.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  1087.         dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  1088.     }else{

  1089.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  1090.         dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  1091.     }

  1092. }

  1093. 

  1094. /**

  1095.  * Decode Simple/Main Profiles sequence header

  1096.  * @see Figure 7-8, p16-17

  1097.  * @param avctx Codec context

  1098.  * @param gb GetBit context initialized from Codec context extra_data

  1099.  * @return Status

  1100.  */

  1101. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1102. {

  1103.     VC1Context *v = avctx->priv_data;

  1104. 

  1105.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1106.     v->profile = get_bits(gb, 2);

  1107.     if (v->profile == 2)

  1108.     {

  1109.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1110.         return -1;

  1111.     }

  1112. 

  1113.     if (v->profile == PROFILE_ADVANCED)

  1114.     {

  1115.         v->level = get_bits(gb, 3);

  1116.         if(v->level >= 5)

  1117.         {

  1118.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1119.         }

  1120.         v->chromaformat = get_bits(gb, 2);

  1121.         if (v->chromaformat != 1)

  1122.         {

  1123.             av_log(avctx, AV_LOG_ERROR,

  1124.                    "Only 4:2:0 chroma format supported\n");

  1125.             return -1;

  1126.         }

  1127.     }

  1128.     else

  1129.     {

  1130.         v->res_sm = get_bits(gb, 2); //reserved

  1131.         if (v->res_sm)

  1132.         {

  1133.             av_log(avctx, AV_LOG_ERROR,

  1134.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1135.             return -1;

  1136.         }

  1137.     }

  1138. 

  1139.     // (fps-2)/4 (->30)

  1140.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1141.     // (bitrate-32kbps)/64kbps

  1142.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1143.     v->s.loop_filter = get_bits(gb, 1); //common

  1144.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1145.     {

  1146.         av_log(avctx, AV_LOG_ERROR,

  1147.                "LOOPFILTER shell not be enabled in simple profile\n");

  1148.     }

  1149. 

  1150.     if (v->profile < PROFILE_ADVANCED)

  1151.     {

  1152.         v->res_x8 = get_bits(gb, 1); //reserved

  1153.         if (v->res_x8)

  1154.         {

  1155.             av_log(avctx, AV_LOG_ERROR,

  1156.                    "1 for reserved RES_X8 is forbidden\n");

  1157.             //return -1;

  1158.         }

  1159.         v->multires = get_bits(gb, 1);

  1160.         v->res_fasttx = get_bits(gb, 1);

  1161.         if (!v->res_fasttx)

  1162.         {

  1163.             av_log(avctx, AV_LOG_ERROR,

  1164.                    "0 for reserved RES_FASTTX is forbidden\n");

  1165.             //return -1;

  1166.         }

  1167.     }

  1168. 

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

  1170.     if (!v->profile && !v->fastuvmc)

  1171.     {

  1172.         av_log(avctx, AV_LOG_ERROR,

  1173.                "FASTUVMC unavailable in Simple Profile\n");

  1174.         return -1;

  1175.     }

  1176.     v->extended_mv =  get_bits(gb, 1); //common

  1177.     if (!v->profile && v->extended_mv)

  1178.     {

  1179.         av_log(avctx, AV_LOG_ERROR,

  1180.                "Extended MVs unavailable in Simple Profile\n");

  1181.         return -1;

  1182.     }

  1183.     v->dquant =  get_bits(gb, 2); //common

  1184.     v->vstransform =  get_bits(gb, 1); //common

  1185. 

  1186.     if (v->profile < PROFILE_ADVANCED)

  1187.     {

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

  1189.         if (v->res_transtab)

  1190.         {

  1191.             av_log(avctx, AV_LOG_ERROR,

  1192.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1193.             return -1;

  1194.         }

  1195.     }

  1196. 

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

  1198. 

  1199.     if (v->profile < PROFILE_ADVANCED)

  1200.     {

  1201.         v->s.resync_marker = get_bits(gb, 1);

  1202.         v->rangered = get_bits(gb, 1);

  1203.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1204.         {

  1205.             av_log(avctx, AV_LOG_INFO,

  1206.                    "RANGERED should be set to 0 in simple profile\n");

  1207.         }

  1208.     }

  1209. 

  1210.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

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

  1212. 

  1213.     if (v->profile < PROFILE_ADVANCED)

  1214.     {

  1215.         v->finterpflag = get_bits(gb, 1); //common

  1216.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1217.         if (!v->res_rtm_flag)

  1218.         {

  1219. //            av_log(avctx, AV_LOG_ERROR,

  1220. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  1221.             av_log(avctx, AV_LOG_ERROR,

  1222.                    "Old WMV3 version detected, only I-frames will be decoded\n");

  1223.             //return -1;

  1224.         }

  1225.         av_log(avctx, AV_LOG_DEBUG,

  1226.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1227.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  1228.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1229.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1230.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1231.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1232.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1233.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1234.                );

  1235.         return 0;

  1236.     }

  1237.     return -1;

  1238. }

  1239. 

  1240. 

  1241. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1242. {

  1243.     int pqindex, lowquant, status;

  1244. 

  1245.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1246.     skip_bits(gb, 2); //framecnt unused

  1247.     v->rangeredfrm = 0;

  1248.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1249.     v->s.pict_type = get_bits(gb, 1);

  1250.     if (v->s.avctx->max_b_frames) {

  1251.         if (!v->s.pict_type) {

  1252.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1253.             else v->s.pict_type = B_TYPE;

  1254.         } else v->s.pict_type = P_TYPE;

  1255.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1256. 

  1257.     if(v->s.pict_type == I_TYPE)

  1258.         get_bits(gb, 7); // skip buffer fullness

  1259.     if(v->s.pict_type == B_TYPE) {

  1260.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1261.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1262.         if(v->bfraction == -1) {

  1263.             v->s.pict_type = BI_TYPE;

  1264.         }

  1265.     }

  1266. 

  1267.     /* calculate RND */

  1268.     if(v->s.pict_type == I_TYPE)

  1269.         v->rnd = 1;

  1270.     if(v->s.pict_type == P_TYPE)

  1271.         v->rnd ^= 1;

  1272. 

  1273.     /* Quantizer stuff */

  1274.     pqindex = get_bits(gb, 5);

  1275.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1276.         v->pq = pquant_table[0][pqindex];

  1277.     else

  1278.         v->pq = pquant_table[1][pqindex];

  1279. 

  1280.     v->pquantizer = 1;

  1281.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1282.         v->pquantizer = pqindex < 9;

  1283.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1284.         v->pquantizer = 0;

  1285.     v->pqindex = pqindex;

  1286.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1287.     else v->halfpq = 0;

  1288.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1289.         v->pquantizer = get_bits(gb, 1);

  1290.     v->dquantfrm = 0;

  1291.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1292.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1293.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1294.     v->range_x = 1 << (v->k_x - 1);

  1295.     v->range_y = 1 << (v->k_y - 1);

  1296.     if (v->profile == PROFILE_ADVANCED)

  1297.     {

  1298.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1299.     }

  1300.     else

  1301.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1302. 

  1303. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1304. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1305. 

  1306.     //TODO: complete parsing for P/B/BI frames

  1307.     switch(v->s.pict_type) {

  1308.     case P_TYPE:

  1309.         if (v->pq < 5) v->tt_index = 0;

  1310.         else if(v->pq < 13) v->tt_index = 1;

  1311.         else v->tt_index = 2;

  1312. 

  1313.         lowquant = (v->pq > 12) ? 0 : 1;

  1314.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1315.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1316.         {

  1317.             int scale, shift, i;

  1318.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1319.             v->lumscale = get_bits(gb, 6);

  1320.             v->lumshift = get_bits(gb, 6);

  1321.             /* fill lookup tables for intensity compensation */

  1322.             if(!v->lumscale) {

  1323.                 scale = -64;

  1324.                 shift = (255 - v->lumshift * 2) << 6;

  1325.                 if(v->lumshift > 31)

  1326.                     shift += 128 << 6;

  1327.             } else {

  1328.                 scale = v->lumscale + 32;

  1329.                 if(v->lumshift > 31)

  1330.                     shift = (v->lumshift - 64) << 6;

  1331.                 else

  1332.                     shift = v->lumshift << 6;

  1333.             }

  1334.             for(i = 0; i < 256; i++) {

  1335.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1336.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1337.             }

  1338.         }

  1339.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1340.             v->s.quarter_sample = 0;

  1341.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1342.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1343.                 v->s.quarter_sample = 0;

  1344.             else

  1345.                 v->s.quarter_sample = 1;

  1346.         } else

  1347.             v->s.quarter_sample = 1;

  1348.         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));

  1349. 

  1350.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1351.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1352.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1353.         {

  1354.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1355.             if (status < 0) return -1;

  1356.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1357.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1358.         } else {

  1359.             v->mv_type_is_raw = 0;

  1360.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1361.         }

  1362.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1363.         if (status < 0) return -1;

  1364.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1365.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1366. 

  1367.         /* Hopefully this is correct for P frames */

  1368.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1369.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1370. 

  1371.         if (v->dquant)

  1372.         {

  1373.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1374.             vop_dquant_decoding(v);

  1375.         }

  1376. 

  1377.         v->ttfrm = 0; //FIXME Is that so ?

  1378.         if (v->vstransform)

  1379.         {

  1380.             v->ttmbf = get_bits(gb, 1);

  1381.             if (v->ttmbf)

  1382.             {

  1383.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1384.             }

  1385.         } else {

  1386.             v->ttmbf = 1;

  1387.             v->ttfrm = TT_8X8;

  1388.         }

  1389.         break;

  1390.     case B_TYPE:

  1391.         if (v->pq < 5) v->tt_index = 0;

  1392.         else if(v->pq < 13) v->tt_index = 1;

  1393.         else v->tt_index = 2;

  1394. 

  1395.         lowquant = (v->pq > 12) ? 0 : 1;

  1396.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1397.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1398.         v->s.mspel = v->s.quarter_sample;

  1399. 

  1400.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1401.         if (status < 0) return -1;

  1402.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1403.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1404.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1405.         if (status < 0) return -1;

  1406.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1407.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1408. 

  1409.         v->s.mv_table_index = get_bits(gb, 2);

  1410.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1411. 

  1412.         if (v->dquant)

  1413.         {

  1414.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1415.             vop_dquant_decoding(v);

  1416.         }

  1417. 

  1418.         v->ttfrm = 0;

  1419.         if (v->vstransform)

  1420.         {

  1421.             v->ttmbf = get_bits(gb, 1);

  1422.             if (v->ttmbf)

  1423.             {

  1424.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1425.             }

  1426.         } else {

  1427.             v->ttmbf = 1;

  1428.             v->ttfrm = TT_8X8;

  1429.         }

  1430.         break;

  1431.     }

  1432. 

  1433.     /* AC Syntax */

  1434.     v->c_ac_table_index = decode012(gb);

  1435.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1436.     {

  1437.         v->y_ac_table_index = decode012(gb);

  1438.     }

  1439.     /* DC Syntax */

  1440.     v->s.dc_table_index = get_bits(gb, 1);

  1441. 

  1442.     return 0;

  1443. }

  1444. 

  1445. /***********************************************************************/

  1446. /**

  1447.  * @defgroup block VC-1 Block-level functions

  1448.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1449.  * @todo TODO: Integrate to MpegEncContext facilities

  1450.  * @{

  1451.  */

  1452. 

  1453. /**

  1454.  * @def GET_MQUANT

  1455.  * @brief Get macroblock-level quantizer scale

  1456.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1457.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1458.  */

  1459. #define GET_MQUANT()                                           \

  1460.   if (v->dquantfrm)                                            \

  1461.   {                                                            \

  1462.     int edges = 0;                                             \

  1463.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1464.     {                                                          \

  1465.       if (v->dqbilevel)                                        \

  1466.       {                                                        \

  1467.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1468.       }                                                        \

  1469.       else                                                     \

  1470.       {                                                        \

  1471.         mqdiff = get_bits(gb, 3);                              \

  1472.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1473.         else mquant = get_bits(gb, 5);                         \

  1474.       }                                                        \

  1475.     }                                                          \

  1476.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1477.         edges = 1 << v->dqsbedge;                              \

  1478.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1479.         edges = (3 << v->dqsbedge) % 15;                       \

  1480.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1481.         edges = 15;                                            \

  1482.     if((edges&1) && !s->mb_x)                                  \

  1483.         mquant = v->altpq;                                     \

  1484.     if((edges&2) && s->first_slice_line)                       \

  1485.         mquant = v->altpq;                                     \

  1486.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1487.         mquant = v->altpq;                                     \

  1488.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1489.         mquant = v->altpq;                                     \

  1490.   }

  1491. 

  1492. /**

  1493.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1494.  * @brief Get MV differentials

  1495.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1496.  * @param _dmv_x Horizontal differential for decoded MV

  1497.  * @param _dmv_y Vertical differential for decoded MV

  1498.  * @todo TODO: Use MpegEncContext arrays to store them

  1499.  */

  1500. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1501.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1502.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1503.   if (index > 36)                                                   \

  1504.   {                                                                 \

  1505.     mb_has_coeffs = 1;                                              \

  1506.     index -= 37;                                                    \

  1507.   }                                                                 \

  1508.   else mb_has_coeffs = 0;                                           \

  1509.   s->mb_intra = 0;                                                  \

  1510.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1511.   else if (index == 35)                                             \

  1512.   {                                                                 \

  1513.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1514.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1515.   }                                                                 \

  1516.   else if (index == 36)                                             \

  1517.   {                                                                 \

  1518.     _dmv_x = 0;                                                     \

  1519.     _dmv_y = 0;                                                     \

  1520.     s->mb_intra = 1;                                                \

  1521.   }                                                                 \

  1522.   else                                                              \

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

  1532.                                                                     \

  1533.     index1 = index/6;                                               \

  1534.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1535.     else                                   val = 0;                 \

  1536.     if(size_table[index1] - val > 0)                                \

  1537.         val = get_bits(gb, size_table[index1] - val);               \

  1538.     else                                   val = 0;                 \

  1539.     sign = 0 - (val&1);                                             \

  1540.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1541.   }

  1542. 

  1543. /** Predict and set motion vector

  1544.  */

  1545. 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)

  1546. {

  1547.     int xy, wrap, off = 0;

  1548.     int16_t *A, *B, *C;

  1549.     int px, py;

  1550.     int sum;

  1551. 

  1552.     /* scale MV difference to be quad-pel */

  1553.     dmv_x <<= 1 - s->quarter_sample;

  1554.     dmv_y <<= 1 - s->quarter_sample;

  1555. 

  1556.     wrap = s->b8_stride;

  1557.     xy = s->block_index[n];

  1558. 

  1559.     if(s->mb_intra){

  1560.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1561.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1562.         if(mv1) { /* duplicate motion data for 1-MV block */

  1563.             s->current_picture.motion_val[0][xy + 1][0] = 0;

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

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

  1566.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1567.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1568.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1569.         }

  1570.         return;

  1571.     }

  1572. 

  1573.     C = s->current_picture.motion_val[0][xy - 1];

  1574.     A = s->current_picture.motion_val[0][xy - wrap];

  1575.     if(mv1)

  1576.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1577.     else {

  1578.         //in 4-MV mode different blocks have different B predictor position

  1579.         switch(n){

  1580.         case 0:

  1581.             off = (s->mb_x > 0) ? -1 : 1;

  1582.             break;

  1583.         case 1:

  1584.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1585.             break;

  1586.         case 2:

  1587.             off = 1;

  1588.             break;

  1589.         case 3:

  1590.             off = -1;

  1591.         }

  1592.     }

  1593.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1594. 

  1595.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1596.         if(s->mb_width == 1) {

  1597.             px = A[0];

  1598.             py = A[1];

  1599.         } else {

  1600.             px = mid_pred(A[0], B[0], C[0]);

  1601.             py = mid_pred(A[1], B[1], C[1]);

  1602.         }

  1603.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1604.         px = C[0];

  1605.         py = C[1];

  1606.     } else {

  1607.         px = py = 0;

  1608.     }

  1609.     /* Pullback MV as specified in 8.3.5.3.4 */

  1610.     {

  1611.         int qx, qy, X, Y;

  1612.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1613.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1614.         X = (s->mb_width << 6) - 4;

  1615.         Y = (s->mb_height << 6) - 4;

  1616.         if(mv1) {

  1617.             if(qx + px < -60) px = -60 - qx;

  1618.             if(qy + py < -60) py = -60 - qy;

  1619.         } else {

  1620.             if(qx + px < -28) px = -28 - qx;

  1621.             if(qy + py < -28) py = -28 - qy;

  1622.         }

  1623.         if(qx + px > X) px = X - qx;

  1624.         if(qy + py > Y) py = Y - qy;

  1625.     }

  1626.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1627.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1628.         if(is_intra[xy - wrap])

  1629.             sum = ABS(px) + ABS(py);

  1630.         else

  1631.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1632.         if(sum > 32) {

  1633.             if(get_bits1(&s->gb)) {

  1634.                 px = A[0];

  1635.                 py = A[1];

  1636.             } else {

  1637.                 px = C[0];

  1638.                 py = C[1];

  1639.             }

  1640.         } else {

  1641.             if(is_intra[xy - 1])

  1642.                 sum = ABS(px) + ABS(py);

  1643.             else

  1644.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1645.             if(sum > 32) {

  1646.                 if(get_bits1(&s->gb)) {

  1647.                     px = A[0];

  1648.                     py = A[1];

  1649.                 } else {

  1650.                     px = C[0];

  1651.                     py = C[1];

  1652.                 }

  1653.             }

  1654.         }

  1655.     }

  1656.     /* store MV using signed modulus of MV range defined in 4.11 */

  1657.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1658.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1659.     if(mv1) { /* duplicate motion data for 1-MV block */

  1660.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1661.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1662.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1663.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1664.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1665.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1666.     }

  1667. }

  1668. 

  1669. /** Motion compensation for direct or interpolated blocks in B-frames

  1670.  */

  1671. static void vc1_interp_mc(VC1Context *v)

  1672. {

  1673.     MpegEncContext *s = &v->s;

  1674.     DSPContext *dsp = &v->s.dsp;

  1675.     uint8_t *srcY, *srcU, *srcV;

  1676.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1677. 

  1678.     if(!v->s.next_picture.data[0])return;

  1679. 

  1680.     mx = s->mv[1][0][0];

  1681.     my = s->mv[1][0][1];

  1682.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1683.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1684.     srcY = s->next_picture.data[0];

  1685.     srcU = s->next_picture.data[1];

  1686.     srcV = s->next_picture.data[2];

  1687. 

  1688.     src_x = s->mb_x * 16 + (mx >> 2);

  1689.     src_y = s->mb_y * 16 + (my >> 2);

  1690.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1691.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1692. 

  1693.     src_x   = clip(  src_x, -16, s->mb_width  * 16);

  1694.     src_y   = clip(  src_y, -16, s->mb_height * 16);

  1695.     uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);

  1696.     uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);

  1697. 

  1698.     srcY += src_y * s->linesize + src_x;

  1699.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1700.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1701. 

  1702.     /* for grayscale we should not try to read from unknown area */

  1703.     if(s->flags & CODEC_FLAG_GRAY) {

  1704.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1705.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1706.     }

  1707. 

  1708.     if(v->rangeredfrm

  1709.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1710.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1711.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1712. 

  1713.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17, 17,

  1714.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1715.         srcY = s->edge_emu_buffer;

  1716.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1717.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1718.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1719.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1720.         srcU = uvbuf;

  1721.         srcV = uvbuf + 16;

  1722.         /* if we deal with range reduction we need to scale source blocks */

  1723.         if(v->rangeredfrm) {

  1724.             int i, j;

  1725.             uint8_t *src, *src2;

  1726. 

  1727.             src = srcY;

  1728.             for(j = 0; j < 17; j++) {

  1729.                 for(i = 0; i < 17; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1730.                 src += s->linesize;

  1731.             }

  1732.             src = srcU; src2 = srcV;

  1733.             for(j = 0; j < 9; j++) {

  1734.                 for(i = 0; i < 9; i++) {

  1735.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1736.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1737.                 }

  1738.                 src += s->uvlinesize;

  1739.                 src2 += s->uvlinesize;

  1740.             }

  1741.         }

  1742.     }

  1743. 

  1744.     if(v->fastuvmc) {

  1745.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1746.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1747.     }

  1748. 

  1749.     mx >>= 1;

  1750.     my >>= 1;

  1751.     dxy = ((my & 1) << 1) | (mx & 1);

  1752. 

  1753.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1754. 

  1755.     if(s->flags & CODEC_FLAG_GRAY) return;

  1756.     /* Chroma MC always uses qpel blilinear */

  1757.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1758.     dsp->avg_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);

  1759.     dsp->avg_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);

  1760. }

  1761. 

  1762. /** Reconstruct motion vector for B-frame and do motion compensation

  1763.  */

  1764. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1765. {

  1766.     MpegEncContext *s = &v->s;

  1767.     int mx[4], my[4], mv_x, mv_y;

  1768.     int i;

  1769. 

  1770.     /* scale MV difference to be quad-pel */

  1771.     dmv_x[0] <<= 1 - s->quarter_sample;

  1772.     dmv_y[0] <<= 1 - s->quarter_sample;

  1773.     dmv_x[1] <<= 1 - s->quarter_sample;

  1774.     dmv_y[1] <<= 1 - s->quarter_sample;

  1775. 

  1776.     if(direct) {

  1777.         for(i = 0; i < 4; i++) {

  1778.             mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];

  1779.             my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];

  1780.         }

  1781.         mv_x = median4(mx[0], mx[1], mx[2], mx[3]);

  1782.         mv_y = median4(my[0], my[1], my[2], my[3]);

  1783.         s->mv[0][0][0] = (mv_x * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1784.         s->mv[0][0][1] = (mv_y * v->bfraction + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1785.         vc1_mc_1mv(v, 0);

  1786. 

  1787.         for(i = 0; i < 4; i++) {

  1788.             mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];

  1789.             my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];

  1790.         }

  1791.         mv_x = median4(mx[0], mx[1], mx[2], mx[3]);

  1792.         mv_y = median4(my[0], my[1], my[2], my[3]);

  1793.         s->mv[1][0][0] = (mv_x * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1794.         s->mv[1][0][1] = (mv_y * (B_FRACTION_DEN - v->bfraction) + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1795.         vc1_interp_mc(v);

  1796.         return;

  1797.     }

  1798.     if(mode == BMV_TYPE_INTERPOLATED) {

  1799.         s->mv[0][0][0] = dmv_x[0];

  1800.         s->mv[0][0][1] = dmv_y[0];

  1801.         vc1_mc_1mv(v, 0);

  1802.         s->mv[1][0][0] = dmv_x[1];

  1803.         s->mv[1][0][1] = dmv_y[1];

  1804.         vc1_interp_mc(v);

  1805.         return;

  1806.     }

  1807. 

  1808.     if(mode == BMV_TYPE_BACKWARD) {

  1809.         for(i = 0; i < 4; i++) {

  1810.             mx[i] = s->last_picture.motion_val[0][s->block_index[i]][0];

  1811.             my[i] = s->last_picture.motion_val[0][s->block_index[i]][1];

  1812.         }

  1813.     } else {

  1814.         for(i = 0; i < 4; i++) {

  1815.             mx[i] = s->next_picture.motion_val[0][s->block_index[i]][0];

  1816.             my[i] = s->next_picture.motion_val[0][s->block_index[i]][1];

  1817.         }

  1818.     }

  1819. 

  1820.     /* XXX: not right but how to determine 4-MV intra/inter in another frame? */

  1821.     mv_x = median4(mx[0], mx[1], mx[2], mx[3]);

  1822.     mv_y = median4(my[0], my[1], my[2], my[3]);

  1823.     s->mv[0][0][0] = mv_x;

  1824.     s->mv[0][0][1] = mv_y;

  1825. 

  1826.     vc1_mc_1mv(v, (mode == BMV_TYPE_FORWARD));

  1827. }

  1828. 

  1829. /** Get predicted DC value for I-frames only

  1830.  * prediction dir: left=0, top=1

  1831.  * @param s MpegEncContext

  1832.  * @param[in] n block index in the current MB

  1833.  * @param dc_val_ptr Pointer to DC predictor

  1834.  * @param dir_ptr Prediction direction for use in AC prediction

  1835.  */

  1836. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1837.                               int16_t **dc_val_ptr, int *dir_ptr)

  1838. {

  1839.     int a, b, c, wrap, pred, scale;

  1840.     int16_t *dc_val;

  1841.     static const uint16_t dcpred[32] = {

  1842.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1843.          114,  102,   93,   85,   79,   73,   68,   64,

  1844.           60,   57,   54,   51,   49,   47,   45,   43,

  1845.           41,   39,   38,   37,   35,   34,   33

  1846.     };

  1847. 

  1848.     /* find prediction - wmv3_dc_scale always used here in fact */

  1849.     if (n < 4)     scale = s->y_dc_scale;

  1850.     else           scale = s->c_dc_scale;

  1851. 

  1852.     wrap = s->block_wrap[n];

  1853.     dc_val= s->dc_val[0] + s->block_index[n];

  1854. 

  1855.     /* B A

  1856.      * C X

  1857.      */

  1858.     c = dc_val[ - 1];

  1859.     b = dc_val[ - 1 - wrap];

  1860.     a = dc_val[ - wrap];

  1861. 

  1862.     if (pq < 9 || !overlap)

  1863.     {

  1864.         /* Set outer values */

  1865.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  1866.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1867.     }

  1868.     else

  1869.     {

  1870.         /* Set outer values */

  1871.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  1872.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1873.     }

  1874. 

  1875.     if (abs(a - b) <= abs(b - c)) {

  1876.         pred = c;

  1877.         *dir_ptr = 1;//left

  1878.     } else {

  1879.         pred = a;

  1880.         *dir_ptr = 0;//top

  1881.     }

  1882. 

  1883.     /* update predictor */

  1884.     *dc_val_ptr = &dc_val[0];

  1885.     return pred;

  1886. }

  1887. 

  1888. 

  1889. /** Get predicted DC value

  1890.  * prediction dir: left=0, top=1

  1891.  * @param s MpegEncContext

  1892.  * @param[in] n block index in the current MB

  1893.  * @param dc_val_ptr Pointer to DC predictor

  1894.  * @param dir_ptr Prediction direction for use in AC prediction

  1895.  */

  1896. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1897.                               int a_avail, int c_avail,

  1898.                               int16_t **dc_val_ptr, int *dir_ptr)

  1899. {

  1900.     int a, b, c, wrap, pred, scale;

  1901.     int16_t *dc_val;

  1902.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1903.     int q1, q2 = 0;

  1904. 

  1905.     /* find prediction - wmv3_dc_scale always used here in fact */

  1906.     if (n < 4)     scale = s->y_dc_scale;

  1907.     else           scale = s->c_dc_scale;

  1908. 

  1909.     wrap = s->block_wrap[n];

  1910.     dc_val= s->dc_val[0] + s->block_index[n];

  1911. 

  1912.     /* B A

  1913.      * C X

  1914.      */

  1915.     c = dc_val[ - 1];

  1916.     b = dc_val[ - 1 - wrap];

  1917.     a = dc_val[ - wrap];

  1918.     /* scale predictors if needed */

  1919.     q1 = s->current_picture.qscale_table[mb_pos];

  1920.     if(c_avail && (n!= 1 && n!=3)) {

  1921.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  1922.         if(q2 && q2 != q1)

  1923.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1924.     }

  1925.     if(a_avail && (n!= 2 && n!=3)) {

  1926.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  1927.         if(q2 && q2 != q1)

  1928.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1929.     }

  1930.     if(a_avail && c_avail && (n!=3)) {

  1931.         int off = mb_pos;

  1932.         if(n != 1) off--;

  1933.         if(n != 2) off -= s->mb_stride;

  1934.         q2 = s->current_picture.qscale_table[off];

  1935.         if(q2 && q2 != q1)

  1936.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1937.     }

  1938. 

  1939.     if(a_avail && c_avail) {

  1940.         if(abs(a - b) <= abs(b - c)) {

  1941.             pred = c;

  1942.             *dir_ptr = 1;//left

  1943.         } else {

  1944.             pred = a;

  1945.             *dir_ptr = 0;//top

  1946.         }

  1947.     } else if(a_avail) {

  1948.         pred = a;

  1949.         *dir_ptr = 0;//top

  1950.     } else if(c_avail) {

  1951.         pred = c;

  1952.         *dir_ptr = 1;//left

  1953.     } else {

  1954.         pred = 0;

  1955.         *dir_ptr = 1;//left

  1956.     }

  1957. 

  1958.     /* update predictor */

  1959.     *dc_val_ptr = &dc_val[0];

  1960.     return pred;

  1961. }

  1962. 

  1963. 

  1964. /**

  1965.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1966.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1967.  * @todo TODO: Integrate to MpegEncContext facilities

  1968.  * @{

  1969.  */

  1970. 

  1971. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1972. {

  1973.     int xy, wrap, pred, a, b, c;

  1974. 

  1975.     xy = s->block_index[n];

  1976.     wrap = s->b8_stride;

  1977. 

  1978.     /* B C

  1979.      * A X

  1980.      */

  1981.     a = s->coded_block[xy - 1       ];

  1982.     b = s->coded_block[xy - 1 - wrap];

  1983.     c = s->coded_block[xy     - wrap];

  1984. 

  1985.     if (b == c) {

  1986.         pred = a;

  1987.     } else {

  1988.         pred = c;

  1989.     }

  1990. 

  1991.     /* store value */

  1992.     *coded_block_ptr = &s->coded_block[xy];

  1993. 

  1994.     return pred;

  1995. }

  1996. 

  1997. /**

  1998.  * Decode one AC coefficient

  1999.  * @param v The VC1 context

  2000.  * @param last Last coefficient

  2001.  * @param skip How much zero coefficients to skip

  2002.  * @param value Decoded AC coefficient value

  2003.  * @see 8.1.3.4

  2004.  */

  2005. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2006. {

  2007.     GetBitContext *gb = &v->s.gb;

  2008.     int index, escape, run = 0, level = 0, lst = 0;

  2009. 

  2010.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2011.     if (index != vc1_ac_sizes[codingset] - 1) {

  2012.         run = vc1_index_decode_table[codingset][index][0];

  2013.         level = vc1_index_decode_table[codingset][index][1];

  2014.         lst = index >= vc1_last_decode_table[codingset];

  2015.         if(get_bits(gb, 1))

  2016.             level = -level;

  2017.     } else {

  2018.         escape = decode210(gb);

  2019.         if (escape != 2) {

  2020.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2021.             run = vc1_index_decode_table[codingset][index][0];

  2022.             level = vc1_index_decode_table[codingset][index][1];

  2023.             lst = index >= vc1_last_decode_table[codingset];

  2024.             if(escape == 0) {

  2025.                 if(lst)

  2026.                     level += vc1_last_delta_level_table[codingset][run];

  2027.                 else

  2028.                     level += vc1_delta_level_table[codingset][run];

  2029.             } else {

  2030.                 if(lst)

  2031.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2032.                 else

  2033.                     run += vc1_delta_run_table[codingset][level] + 1;

  2034.             }

  2035.             if(get_bits(gb, 1))

  2036.                 level = -level;

  2037.         } else {

  2038.             int sign;

  2039.             lst = get_bits(gb, 1);

  2040.             if(v->s.esc3_level_length == 0) {

  2041.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2042.                     v->s.esc3_level_length = get_bits(gb, 3);

  2043.                     if(!v->s.esc3_level_length)

  2044.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2045.                 } else { //table 60

  2046.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2047.                 }

  2048.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2049.             }

  2050.             run = get_bits(gb, v->s.esc3_run_length);

  2051.             sign = get_bits(gb, 1);

  2052.             level = get_bits(gb, v->s.esc3_level_length);

  2053.             if(sign)

  2054.                 level = -level;

  2055.         }

  2056.     }

  2057. 

  2058.     *last = lst;

  2059.     *skip = run;

  2060.     *value = level;

  2061. }

  2062. 

  2063. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2064.  * @param v VC1Context

  2065.  * @param block block to decode

  2066.  * @param coded are AC coeffs present or not

  2067.  * @param codingset set of VLC to decode data

  2068.  */

  2069. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2070. {

  2071.     GetBitContext *gb = &v->s.gb;

  2072.     MpegEncContext *s = &v->s;

  2073.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2074.     int run_diff, i;

  2075.     int16_t *dc_val;

  2076.     int16_t *ac_val, *ac_val2;

  2077.     int dcdiff;

  2078. 

  2079.     /* Get DC differential */

  2080.     if (n < 4) {

  2081.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2082.     } else {

  2083.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2084.     }

  2085.     if (dcdiff < 0){

  2086.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2087.         return -1;

  2088.     }

  2089.     if (dcdiff)

  2090.     {

  2091.         if (dcdiff == 119 /* ESC index value */)

  2092.         {

  2093.             /* TODO: Optimize */

  2094.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2095.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2096.             else dcdiff = get_bits(gb, 8);

  2097.         }

  2098.         else

  2099.         {

  2100.             if (v->pq == 1)

  2101.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2102.             else if (v->pq == 2)

  2103.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2104.         }

  2105.         if (get_bits(gb, 1))

  2106.             dcdiff = -dcdiff;

  2107.     }

  2108. 

  2109.     /* Prediction */

  2110.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2111.     *dc_val = dcdiff;

  2112. 

  2113.     /* Store the quantized DC coeff, used for prediction */

  2114.     if (n < 4) {

  2115.         block[0] = dcdiff * s->y_dc_scale;

  2116.     } else {

  2117.         block[0] = dcdiff * s->c_dc_scale;

  2118.     }

  2119.     /* Skip ? */

  2120.     run_diff = 0;

  2121.     i = 0;

  2122.     if (!coded) {

  2123.         goto not_coded;

  2124.     }

  2125. 

  2126.     //AC Decoding

  2127.     i = 1;

  2128. 

  2129.     {

  2130.         int last = 0, skip, value;

  2131.         const int8_t *zz_table;

  2132.         int scale;

  2133.         int k;

  2134. 

  2135.         scale = v->pq * 2 + v->halfpq;

  2136. 

  2137.         if(v->s.ac_pred) {

  2138.             if(!dc_pred_dir)

  2139.                 zz_table = vc1_horizontal_zz;

  2140.             else

  2141.                 zz_table = vc1_vertical_zz;

  2142.         } else

  2143.             zz_table = vc1_normal_zz;

  2144. 

  2145.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2146.         ac_val2 = ac_val;

  2147.         if(dc_pred_dir) //left

  2148.             ac_val -= 16;

  2149.         else //top

  2150.             ac_val -= 16 * s->block_wrap[n];

  2151. 

  2152.         while (!last) {

  2153.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2154.             i += skip;

  2155.             if(i > 63)

  2156.                 break;

  2157.             block[zz_table[i++]] = value;

  2158.         }

  2159. 

  2160.         /* apply AC prediction if needed */

  2161.         if(s->ac_pred) {

  2162.             if(dc_pred_dir) { //left

  2163.                 for(k = 1; k < 8; k++)

  2164.                     block[k << 3] += ac_val[k];

  2165.             } else { //top

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

  2167.                     block[k] += ac_val[k + 8];

  2168.             }

  2169.         }

  2170.         /* save AC coeffs for further prediction */

  2171.         for(k = 1; k < 8; k++) {

  2172.             ac_val2[k] = block[k << 3];

  2173.             ac_val2[k + 8] = block[k];

  2174.         }

  2175. 

  2176.         /* scale AC coeffs */

  2177.         for(k = 1; k < 64; k++)

  2178.             if(block[k]) {

  2179.                 block[k] *= scale;

  2180.                 if(!v->pquantizer)

  2181.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2182.             }

  2183. 

  2184.         if(s->ac_pred) i = 63;

  2185.     }

  2186. 

  2187. not_coded:

  2188.     if(!coded) {

  2189.         int k, scale;

  2190.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2191.         ac_val2 = ac_val;

  2192. 

  2193.         scale = v->pq * 2 + v->halfpq;

  2194.         memset(ac_val2, 0, 16 * 2);

  2195.         if(dc_pred_dir) {//left

  2196.             ac_val -= 16;

  2197.             if(s->ac_pred)

  2198.                 memcpy(ac_val2, ac_val, 8 * 2);

  2199.         } else {//top

  2200.             ac_val -= 16 * s->block_wrap[n];

  2201.             if(s->ac_pred)

  2202.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2203.         }

  2204. 

  2205.         /* apply AC prediction if needed */

  2206.         if(s->ac_pred) {

  2207.             if(dc_pred_dir) { //left

  2208.                 for(k = 1; k < 8; k++) {

  2209.                     block[k << 3] = ac_val[k] * scale;

  2210.                     if(!v->pquantizer && block[k << 3])

  2211.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2212.                 }

  2213.             } else { //top

  2214.                 for(k = 1; k < 8; k++) {

  2215.                     block[k] = ac_val[k + 8] * scale;

  2216.                     if(!v->pquantizer && block[k])

  2217.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2218.                 }

  2219.             }

  2220.             i = 63;

  2221.         }

  2222.     }

  2223.     s->block_last_index[n] = i;

  2224. 

  2225.     return 0;

  2226. }

  2227. 

  2228. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2229.  * @param v VC1Context

  2230.  * @param block block to decode

  2231.  * @param coded are AC coeffs present or not

  2232.  * @param mquant block quantizer

  2233.  * @param codingset set of VLC to decode data

  2234.  */

  2235. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2236. {

  2237.     GetBitContext *gb = &v->s.gb;

  2238.     MpegEncContext *s = &v->s;

  2239.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2240.     int run_diff, i;

  2241.     int16_t *dc_val;

  2242.     int16_t *ac_val, *ac_val2;

  2243.     int dcdiff;

  2244.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2245.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2246.     int use_pred = s->ac_pred;

  2247.     int scale;

  2248.     int q1, q2 = 0;

  2249. 

  2250.     /* XXX: Guard against dumb values of mquant */

  2251.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2252. 

  2253.     /* Set DC scale - y and c use the same */

  2254.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2255.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2256. 

  2257.     /* Get DC differential */

  2258.     if (n < 4) {

  2259.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2260.     } else {

  2261.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2262.     }

  2263.     if (dcdiff < 0){

  2264.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2265.         return -1;

  2266.     }

  2267.     if (dcdiff)

  2268.     {

  2269.         if (dcdiff == 119 /* ESC index value */)

  2270.         {

  2271.             /* TODO: Optimize */

  2272.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2273.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2274.             else dcdiff = get_bits(gb, 8);

  2275.         }

  2276.         else

  2277.         {

  2278.             if (mquant == 1)

  2279.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2280.             else if (mquant == 2)

  2281.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2282.         }

  2283.         if (get_bits(gb, 1))

  2284.             dcdiff = -dcdiff;

  2285.     }

  2286. 

  2287.     /* Prediction */

  2288.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2289.     *dc_val = dcdiff;

  2290. 

  2291.     /* Store the quantized DC coeff, used for prediction */

  2292. 

  2293.     if (n < 4) {

  2294.         block[0] = dcdiff * s->y_dc_scale;

  2295.     } else {

  2296.         block[0] = dcdiff * s->c_dc_scale;

  2297.     }

  2298.     /* Skip ? */

  2299.     run_diff = 0;

  2300.     i = 0;

  2301. 

  2302.     //AC Decoding

  2303.     i = 1;

  2304. 

  2305.     /* check if AC is needed at all and adjust direction if needed */

  2306.     if(!a_avail) dc_pred_dir = 1;

  2307.     if(!c_avail) dc_pred_dir = 0;

  2308.     if(!a_avail && !c_avail) use_pred = 0;

  2309.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2310.     ac_val2 = ac_val;

  2311. 

  2312.     scale = mquant * 2 + v->halfpq;

  2313. 

  2314.     if(dc_pred_dir) //left

  2315.         ac_val -= 16;

  2316.     else //top

  2317.         ac_val -= 16 * s->block_wrap[n];

  2318. 

  2319.     q1 = s->current_picture.qscale_table[mb_pos];

  2320.     if(dc_pred_dir && c_avail) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2321.     if(!dc_pred_dir && a_avail) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2322.     if(n && n<4) q2 = q1;

  2323. 

  2324.     if(coded) {

  2325.         int last = 0, skip, value;

  2326.         const int8_t *zz_table;

  2327.         int k;

  2328. 

  2329.         zz_table = vc1_simple_progressive_8x8_zz;

  2330. 

  2331.         while (!last) {

  2332.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2333.             i += skip;

  2334.             if(i > 63)

  2335.                 break;

  2336.             block[zz_table[i++]] = value;

  2337.         }

  2338. 

  2339.         /* apply AC prediction if needed */

  2340.         if(use_pred) {

  2341.             /* scale predictors if needed*/

  2342.             if(q2 && q1!=q2) {

  2343.                 q1 = q1 * 2 - 1;

  2344.                 q2 = q2 * 2 - 1;

  2345. 

  2346.                 if(dc_pred_dir) { //left

  2347.                     for(k = 1; k < 8; k++)

  2348.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2349.                 } else { //top

  2350.                     for(k = 1; k < 8; k++)

  2351.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2352.                 }

  2353.             } else {

  2354.                 if(dc_pred_dir) { //left

  2355.                     for(k = 1; k < 8; k++)

  2356.                         block[k << 3] += ac_val[k];

  2357.                 } else { //top

  2358.                     for(k = 1; k < 8; k++)

  2359.                         block[k] += ac_val[k + 8];

  2360.                 }

  2361.             }

  2362.         }

  2363.         /* save AC coeffs for further prediction */

  2364.         for(k = 1; k < 8; k++) {

  2365.             ac_val2[k] = block[k << 3];

  2366.             ac_val2[k + 8] = block[k];

  2367.         }

  2368. 

  2369.         /* scale AC coeffs */

  2370.         for(k = 1; k < 64; k++)

  2371.             if(block[k]) {

  2372.                 block[k] *= scale;

  2373.                 if(!v->pquantizer)

  2374.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2375.             }

  2376. 

  2377.         if(use_pred) i = 63;

  2378.     } else { // no AC coeffs

  2379.         int k;

  2380. 

  2381.         memset(ac_val2, 0, 16 * 2);

  2382.         if(dc_pred_dir) {//left

  2383.             if(use_pred) {

  2384.                 memcpy(ac_val2, ac_val, 8 * 2);

  2385.                 if(q2 && q1!=q2) {

  2386.                     q1 = q1 * 2 - 1;

  2387.                     q2 = q2 * 2 - 1;

  2388.                     for(k = 1; k < 8; k++)

  2389.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2390.                 }

  2391.             }

  2392.         } else {//top

  2393.             if(use_pred) {

  2394.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2395.                 if(q2 && q1!=q2) {

  2396.                     q1 = q1 * 2 - 1;

  2397.                     q2 = q2 * 2 - 1;

  2398.                     for(k = 1; k < 8; k++)

  2399.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2400.                 }

  2401.             }

  2402.         }

  2403. 

  2404.         /* apply AC prediction if needed */

  2405.         if(use_pred) {

  2406.             if(dc_pred_dir) { //left

  2407.                 for(k = 1; k < 8; k++) {

  2408.                     block[k << 3] = ac_val2[k] * scale;

  2409.                     if(!v->pquantizer && block[k << 3])

  2410.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2411.                 }

  2412.             } else { //top

  2413.                 for(k = 1; k < 8; k++) {

  2414.                     block[k] = ac_val2[k + 8] * scale;

  2415.                     if(!v->pquantizer && block[k])

  2416.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2417.                 }

  2418.             }

  2419.             i = 63;

  2420.         }

  2421.     }

  2422.     s->block_last_index[n] = i;

  2423. 

  2424.     return 0;

  2425. }

  2426. 

  2427. /** Decode P block

  2428.  */

  2429. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2430. {

  2431.     MpegEncContext *s = &v->s;

  2432.     GetBitContext *gb = &s->gb;

  2433.     int i, j;

  2434.     int subblkpat = 0;

  2435.     int scale, off, idx, last, skip, value;

  2436.     int ttblk = ttmb & 7;

  2437. 

  2438.     if(ttmb == -1) {

  2439.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2440.     }

  2441.     if(ttblk == TT_4X4) {

  2442.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2443.     }

  2444.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2445.         subblkpat = decode012(gb);

  2446.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2447.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2448.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2449.     }

  2450.     scale = 2 * mquant + v->halfpq;

  2451. 

  2452.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2453.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2454.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2455.         ttblk = TT_8X4;

  2456.     }

  2457.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2458.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2459.         ttblk = TT_4X8;

  2460.     }

  2461.     switch(ttblk) {

  2462.     case TT_8X8:

  2463.         i = 0;

  2464.         last = 0;

  2465.         while (!last) {

  2466.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2467.             i += skip;

  2468.             if(i > 63)

  2469.                 break;

  2470.             idx = vc1_simple_progressive_8x8_zz[i++];

  2471.             block[idx] = value * scale;

  2472.             if(!v->pquantizer)

  2473.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2474.         }

  2475.         s->dsp.vc1_inv_trans_8x8(block);

  2476.         break;

  2477.     case TT_4X4:

  2478.         for(j = 0; j < 4; j++) {

  2479.             last = subblkpat & (1 << (3 - j));

  2480.             i = 0;

  2481.             off = (j & 1) * 4 + (j & 2) * 16;

  2482.             while (!last) {

  2483.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2484.                 i += skip;

  2485.                 if(i > 15)

  2486.                     break;

  2487.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2488.                 block[idx + off] = value * scale;

  2489.                 if(!v->pquantizer)

  2490.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2491.             }

  2492.             if(!(subblkpat & (1 << (3 - j))))

  2493.                 s->dsp.vc1_inv_trans_4x4(block, j);

  2494.         }

  2495.         break;

  2496.     case TT_8X4:

  2497.         for(j = 0; j < 2; j++) {

  2498.             last = subblkpat & (1 << (1 - j));

  2499.             i = 0;

  2500.             off = j * 32;

  2501.             while (!last) {

  2502.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2503.                 i += skip;

  2504.                 if(i > 31)

  2505.                     break;

  2506.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2507.                 block[idx + off] = value * scale;

  2508.                 if(!v->pquantizer)

  2509.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2510.             }

  2511.             if(!(subblkpat & (1 << (1 - j))))

  2512.                 s->dsp.vc1_inv_trans_8x4(block, j);

  2513.         }

  2514.         break;

  2515.     case TT_4X8:

  2516.         for(j = 0; j < 2; j++) {

  2517.             last = subblkpat & (1 << (1 - j));

  2518.             i = 0;

  2519.             off = j * 4;

  2520.             while (!last) {

  2521.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2522.                 i += skip;

  2523.                 if(i > 31)

  2524.                     break;

  2525.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2526.                 block[idx + off] = value * scale;

  2527.                 if(!v->pquantizer)

  2528.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2529.             }

  2530.             if(!(subblkpat & (1 << (1 - j))))

  2531.                 s->dsp.vc1_inv_trans_4x8(block, j);

  2532.         }

  2533.         break;

  2534.     }

  2535.     return 0;

  2536. }

  2537. 

  2538. 

  2539. /** Decode one P-frame MB (in Simple/Main profile)

  2540.  * @todo TODO: Extend to AP

  2541.  * @fixme FIXME: DC value for inter blocks not set

  2542.  */

  2543. static int vc1_decode_p_mb(VC1Context *v)

  2544. {

  2545.     MpegEncContext *s = &v->s;

  2546.     GetBitContext *gb = &s->gb;

  2547.     int i, j;

  2548.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2549.     int cbp; /* cbp decoding stuff */

  2550.     int mqdiff, mquant; /* MB quantization */

  2551.     int ttmb = v->ttfrm; /* MB Transform type */

  2552.     int status;

  2553. 

  2554.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2555.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2556.     int mb_has_coeffs = 1; /* last_flag */

  2557.     int dmv_x, dmv_y; /* Differential MV components */

  2558.     int index, index1; /* LUT indices */

  2559.     int val, sign; /* temp values */

  2560.     int first_block = 1;

  2561.     int dst_idx, off;

  2562.     int skipped, fourmv;

  2563. 

  2564.     mquant = v->pq; /* Loosy initialization */

  2565. 

  2566.     if (v->mv_type_is_raw)

  2567.         fourmv = get_bits1(gb);

  2568.     else

  2569.         fourmv = v->mv_type_mb_plane[mb_pos];

  2570.     if (v->skip_is_raw)

  2571.         skipped = get_bits1(gb);

  2572.     else

  2573.         skipped = v->s.mbskip_table[mb_pos];

  2574. 

  2575.     s->dsp.clear_blocks(s->block[0]);

  2576. 

  2577.     if (!fourmv) /* 1MV mode */

  2578.     {

  2579.         if (!skipped)

  2580.         {

  2581.             GET_MVDATA(dmv_x, dmv_y);

  2582. 

  2583.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2584.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  2585. 

  2586.             /* FIXME Set DC val for inter block ? */

  2587.             if (s->mb_intra && !mb_has_coeffs)

  2588.             {

  2589.                 GET_MQUANT();

  2590.                 s->ac_pred = get_bits(gb, 1);

  2591.                 cbp = 0;

  2592.             }

  2593.             else if (mb_has_coeffs)

  2594.             {

  2595.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2596.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2597.                 GET_MQUANT();

  2598.             }

  2599.             else

  2600.             {

  2601.                 mquant = v->pq;

  2602.                 cbp = 0;

  2603.             }

  2604.             s->current_picture.qscale_table[mb_pos] = mquant;

  2605. 

  2606.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2607.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2608.                                 VC1_TTMB_VLC_BITS, 2);

  2609.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  2610.             dst_idx = 0;

  2611.             for (i=0; i<6; i++)

  2612.             {

  2613.                 s->dc_val[0][s->block_index[i]] = 0;

  2614.                 dst_idx += i >> 2;

  2615.                 val = ((cbp >> (5 - i)) & 1);

  2616.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2617.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2618.                 if(s->mb_intra) {

  2619.                     /* check if prediction blocks A and C are available */

  2620.                     v->a_avail = v->c_avail = 0;

  2621.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2622.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2623.                     if(i == 1 || i == 3 || s->mb_x)

  2624.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2625. 

  2626.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2627.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2628.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2629.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2630.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2631.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2632.                     /* TODO: proper loop filtering */

  2633.                     if(v->pq >= 9 && v->overlap) {

  2634.                         if(v->a_avail)

  2635.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? ((i&1)>>1) : (s->mb_y&1));

  2636.                         if(v->c_avail)

  2637.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? (i&1) : (s->mb_x&1));

  2638.                     }

  2639.                 } else if(val) {

  2640.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2641.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2642.                     first_block = 0;

  2643.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2644.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2645.                 }

  2646.             }

  2647.         }

  2648.         else //Skipped

  2649.         {

  2650.             s->mb_intra = 0;

  2651.             for(i = 0; i < 6; i++) {

  2652.                 v->mb_type[0][s->block_index[i]] = 0;

  2653.                 s->dc_val[0][s->block_index[i]] = 0;

  2654.             }

  2655.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2656.             s->current_picture.qscale_table[mb_pos] = 0;

  2657.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  2658.             vc1_mc_1mv(v, 0);

  2659.             return 0;

  2660.         }

  2661.     } //1MV mode

  2662.     else //4MV mode

  2663.     {

  2664.         if (!skipped /* unskipped MB */)

  2665.         {

  2666.             int intra_count = 0, coded_inter = 0;

  2667.             int is_intra[6], is_coded[6];

  2668.             /* Get CBPCY */

  2669.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2670.             for (i=0; i<6; i++)

  2671.             {

  2672.                 val = ((cbp >> (5 - i)) & 1);

  2673.                 s->dc_val[0][s->block_index[i]] = 0;

  2674.                 s->mb_intra = 0;

  2675.                 if(i < 4) {

  2676.                     dmv_x = dmv_y = 0;

  2677.                     s->mb_intra = 0;

  2678.                     mb_has_coeffs = 0;

  2679.                     if(val) {

  2680.                         GET_MVDATA(dmv_x, dmv_y);

  2681.                     }

  2682.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  2683.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  2684.                     intra_count += s->mb_intra;

  2685.                     is_intra[i] = s->mb_intra;

  2686.                     is_coded[i] = mb_has_coeffs;

  2687.                 }

  2688.                 if(i&4){

  2689.                     is_intra[i] = (intra_count >= 3);

  2690.                     is_coded[i] = val;

  2691.                 }

  2692.                 if(i == 4) vc1_mc_4mv_chroma(v);

  2693.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  2694.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  2695.             }

  2696.             // if there are no coded blocks then don't do anything more

  2697.             if(!intra_count && !coded_inter) return 0;

  2698.             dst_idx = 0;

  2699.             GET_MQUANT();

  2700.             s->current_picture.qscale_table[mb_pos] = mquant;

  2701.             /* test if block is intra and has pred */

  2702.             {

  2703.                 int intrapred = 0;

  2704.                 for(i=0; i<6; i++)

  2705.                     if(is_intra[i]) {

  2706.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  2707.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  2708.                             intrapred = 1;

  2709.                             break;

  2710.                         }

  2711.                     }

  2712.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  2713.                 else s->ac_pred = 0;

  2714.             }

  2715.             if (!v->ttmbf && coded_inter)

  2716.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2717.             for (i=0; i<6; i++)

  2718.             {

  2719.                 dst_idx += i >> 2;

  2720.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2721.                 s->mb_intra = is_intra[i];

  2722.                 if (is_intra[i]) {

  2723.                     /* check if prediction blocks A and C are available */

  2724.                     v->a_avail = v->c_avail = 0;

  2725.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2726.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2727.                     if(i == 1 || i == 3 || s->mb_x)

  2728.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2729. 

  2730.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  2731.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2732.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2733.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2734.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2735.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2736.                     /* TODO: proper loop filtering */

  2737.                     if(v->pq >= 9 && v->overlap) {

  2738.                         if(v->a_avail)

  2739.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? ((i&1)>>1) : (s->mb_y&1));

  2740.                         if(v->c_avail)

  2741.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), (i<4) ? (i&1) : (s->mb_x&1));

  2742.                     }

  2743.                 } else if(is_coded[i]) {

  2744.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2745.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2746.                     first_block = 0;

  2747.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2748.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2749.                 }

  2750.             }

  2751.             return status;

  2752.         }

  2753.         else //Skipped MB

  2754.         {

  2755.             s->mb_intra = 0;

  2756.             s->current_picture.qscale_table[mb_pos] = 0;

  2757.             for (i=0; i<6; i++) {

  2758.                 v->mb_type[0][s->block_index[i]] = 0;

  2759.                 s->dc_val[0][s->block_index[i]] = 0;

  2760.             }

  2761.             for (i=0; i<4; i++)

  2762.             {

  2763.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  2764.                 vc1_mc_4mv_luma(v, i);

  2765.             }

  2766.             vc1_mc_4mv_chroma(v);

  2767.             s->current_picture.qscale_table[mb_pos] = 0;

  2768.             return 0;

  2769.         }

  2770.     }

  2771. 

  2772.     /* Should never happen */

  2773.     return -1;

  2774. }

  2775. 

  2776. /** Decode one B-frame MB (in Main profile)

  2777.  */

  2778. static void vc1_decode_b_mb(VC1Context *v)

  2779. {

  2780.     MpegEncContext *s = &v->s;

  2781.     GetBitContext *gb = &s->gb;

  2782.     int i, j;

  2783.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2784.     int cbp = 0; /* cbp decoding stuff */

  2785.     int mqdiff, mquant; /* MB quantization */

  2786.     int ttmb = v->ttfrm; /* MB Transform type */

  2787. 

  2788.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2789.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2790.     int mb_has_coeffs = 0; /* last_flag */

  2791.     int index, index1; /* LUT indices */

  2792.     int val, sign; /* temp values */

  2793.     int first_block = 1;

  2794.     int dst_idx, off;

  2795.     int skipped, direct;

  2796.     int dmv_x[2], dmv_y[2];

  2797.     int bmvtype = BMV_TYPE_BACKWARD; /* XXX: is it so? */

  2798. 

  2799.     mquant = v->pq; /* Loosy initialization */

  2800.     s->mb_intra = 0;

  2801. 

  2802.     if (v->dmb_is_raw)

  2803.         direct = get_bits1(gb);

  2804.     else

  2805.         direct = v->direct_mb_plane[mb_pos];

  2806.     if (v->skip_is_raw)

  2807.         skipped = get_bits1(gb);

  2808.     else

  2809.         skipped = v->s.mbskip_table[mb_pos];

  2810. 

  2811.     s->dsp.clear_blocks(s->block[0]);

  2812.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  2813.     for(i = 0; i < 6; i++) {

  2814.         v->mb_type[0][s->block_index[i]] = 0;

  2815.         s->dc_val[0][s->block_index[i]] = 0;

  2816.     }

  2817.     s->current_picture.qscale_table[mb_pos] = 0;

  2818. 

  2819.     if (!direct) {

  2820.         if (!skipped) {

  2821.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  2822.             dmv_x[1] = dmv_x[0];

  2823.             dmv_y[1] = dmv_y[0];

  2824.         }

  2825.         if(skipped || !s->mb_intra) {

  2826.             bmvtype = decode012(gb);

  2827.             switch(bmvtype) {

  2828.             case 0:

  2829.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  2830.                 break;

  2831.             case 1:

  2832.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  2833.                 break;

  2834.             case 2:

  2835.                 bmvtype = BMV_TYPE_INTERPOLATED;

  2836.             }

  2837.         }

  2838.     }

  2839.     if (skipped) {

  2840.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2841.         return;

  2842.     }

  2843.     if (direct) {

  2844.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2845.         GET_MQUANT();

  2846.         s->mb_intra = 0;

  2847.         mb_has_coeffs = 0;

  2848.         s->current_picture.qscale_table[mb_pos] = mquant;

  2849.         if(!v->ttmbf)

  2850.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2851.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2852.     } else {

  2853.         if(!mb_has_coeffs && !s->mb_intra) {

  2854.             /* no coded blocks - effectively skipped */

  2855.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2856.             return;

  2857.         }

  2858.         if(s->mb_intra && !mb_has_coeffs) {

  2859.             GET_MQUANT();

  2860.             s->current_picture.qscale_table[mb_pos] = mquant;

  2861.             s->ac_pred = get_bits1(gb);

  2862.             cbp = 0;

  2863.         } else {

  2864.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  2865.                 GET_MVDATA(dmv_x[1], dmv_y[1]);

  2866.                 if(!mb_has_coeffs) {

  2867.                     /* interpolated skipped block */

  2868.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2869.                     return;

  2870.                 }

  2871.             }

  2872.             if(!s->mb_intra)

  2873.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  2874.             if(s->mb_intra)

  2875.                 s->ac_pred = get_bits1(gb);

  2876.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2877.             GET_MQUANT();

  2878.             s->current_picture.qscale_table[mb_pos] = mquant;

  2879.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2880.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2881.         }

  2882.     }

  2883.     dst_idx = 0;

  2884.     for (i=0; i<6; i++)

  2885.     {

  2886.         s->dc_val[0][s->block_index[i]] = 0;

  2887.         dst_idx += i >> 2;

  2888.         val = ((cbp >> (5 - i)) & 1);

  2889.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2890.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2891.         if(s->mb_intra) {

  2892.             /* check if prediction blocks A and C are available */

  2893.             v->a_avail = v->c_avail = 0;

  2894.             if(i == 2 || i == 3 || !s->first_slice_line)

  2895.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2896.             if(i == 1 || i == 3 || s->mb_x)

  2897.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2898. 

  2899.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2900.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  2901.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  2902.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  2903.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  2904.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2905.         } else if(val) {

  2906.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2907.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2908.             first_block = 0;

  2909.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  2910.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2911.         }

  2912.     }

  2913. }

  2914. 

  2915. /** Decode blocks of I-frame

  2916.  */

  2917. static void vc1_decode_i_blocks(VC1Context *v)

  2918. {

  2919.     int k, j;

  2920.     MpegEncContext *s = &v->s;

  2921.     int cbp, val;

  2922.     uint8_t *coded_val;

  2923.     int mb_pos;

  2924. 

  2925.     /* select codingmode used for VLC tables selection */

  2926.     switch(v->y_ac_table_index){

  2927.     case 0:

  2928.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2929.         break;

  2930.     case 1:

  2931.         v->codingset = CS_HIGH_MOT_INTRA;

  2932.         break;

  2933.     case 2:

  2934.         v->codingset = CS_MID_RATE_INTRA;

  2935.         break;

  2936.     }

  2937. 

  2938.     switch(v->c_ac_table_index){

  2939.     case 0:

  2940.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2941.         break;

  2942.     case 1:

  2943.         v->codingset2 = CS_HIGH_MOT_INTER;

  2944.         break;

  2945.     case 2:

  2946.         v->codingset2 = CS_MID_RATE_INTER;

  2947.         break;

  2948.     }

  2949. 

  2950.     /* Set DC scale - y and c use the same */

  2951.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2952.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2953. 

  2954.     //do frame decode

  2955.     s->mb_x = s->mb_y = 0;

  2956.     s->mb_intra = 1;

  2957.     s->first_slice_line = 1;

  2958.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2959.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2960.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2961.             ff_init_block_index(s);

  2962.             ff_update_block_index(s);

  2963.             s->dsp.clear_blocks(s->block[0]);

  2964.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2965.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2966.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2967. 

  2968.             // do actual MB decoding and displaying

  2969.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2970.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2971. 

  2972.             for(k = 0; k < 6; k++) {

  2973.                 val = ((cbp >> (5 - k)) & 1);

  2974. 

  2975.                 if (k < 4) {

  2976.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2977.                     val = val ^ pred;

  2978.                     *coded_val = val;

  2979.                 }

  2980.                 cbp |= val << (5 - k);

  2981. 

  2982.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2983. 

  2984.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  2985.                 if(v->pq >= 9 && v->overlap) {

  2986.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  2987.                 }

  2988.             }

  2989. 

  2990.             vc1_put_block(v, s->block);

  2991.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2992.                 if(!s->first_slice_line) {

  2993.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize, 0);

  2994.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize, 0);

  2995.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  2996.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize, s->mb_y&1);

  2997.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize, s->mb_y&1);

  2998.                     }

  2999.                 }

  3000.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize, 1);

  3001.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize, 1);

  3002.                 if(s->mb_x) {

  3003.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize, 0);

  3004.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize, 0);

  3005.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3006.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize, s->mb_x&1);

  3007.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize, s->mb_x&1);

  3008.                     }

  3009.                 }

  3010.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize, 1);

  3011.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize, 1);

  3012.             }

  3013. 

  3014.             if(get_bits_count(&s->gb) > v->bits) {

  3015.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3016.                 return;

  3017.             }

  3018.         }

  3019.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3020.         s->first_slice_line = 0;

  3021.     }

  3022. }

  3023. 

  3024. static void vc1_decode_p_blocks(VC1Context *v)

  3025. {

  3026.     MpegEncContext *s = &v->s;

  3027. 

  3028.     /* select codingmode used for VLC tables selection */

  3029.     switch(v->c_ac_table_index){

  3030.     case 0:

  3031.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3032.         break;

  3033.     case 1:

  3034.         v->codingset = CS_HIGH_MOT_INTRA;

  3035.         break;

  3036.     case 2:

  3037.         v->codingset = CS_MID_RATE_INTRA;

  3038.         break;

  3039.     }

  3040. 

  3041.     switch(v->c_ac_table_index){

  3042.     case 0:

  3043.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3044.         break;

  3045.     case 1:

  3046.         v->codingset2 = CS_HIGH_MOT_INTER;

  3047.         break;

  3048.     case 2:

  3049.         v->codingset2 = CS_MID_RATE_INTER;

  3050.         break;

  3051.     }

  3052. 

  3053.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3054.     s->first_slice_line = 1;

  3055.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3056.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3057.             ff_init_block_index(s);

  3058.             ff_update_block_index(s);

  3059.             s->dsp.clear_blocks(s->block[0]);

  3060. 

  3061.             vc1_decode_p_mb(v);

  3062.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3063.                 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);

  3064.                 return;

  3065.             }

  3066.         }

  3067.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3068.         s->first_slice_line = 0;

  3069.     }

  3070. }

  3071. 

  3072. static void vc1_decode_b_blocks(VC1Context *v)

  3073. {

  3074.     MpegEncContext *s = &v->s;

  3075. 

  3076.     /* select codingmode used for VLC tables selection */

  3077.     switch(v->c_ac_table_index){

  3078.     case 0:

  3079.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3080.         break;

  3081.     case 1:

  3082.         v->codingset = CS_HIGH_MOT_INTRA;

  3083.         break;

  3084.     case 2:

  3085.         v->codingset = CS_MID_RATE_INTRA;

  3086.         break;

  3087.     }

  3088. 

  3089.     switch(v->c_ac_table_index){

  3090.     case 0:

  3091.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3092.         break;

  3093.     case 1:

  3094.         v->codingset2 = CS_HIGH_MOT_INTER;

  3095.         break;

  3096.     case 2:

  3097.         v->codingset2 = CS_MID_RATE_INTER;

  3098.         break;

  3099.     }

  3100. 

  3101.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3102.     s->first_slice_line = 1;

  3103.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3104.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3105.             ff_init_block_index(s);

  3106.             ff_update_block_index(s);

  3107.             s->dsp.clear_blocks(s->block[0]);

  3108. 

  3109.             vc1_decode_b_mb(v);

  3110.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3111.                 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);

  3112.                 return;

  3113.             }

  3114.         }

  3115.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3116.         s->first_slice_line = 0;

  3117.     }

  3118. }

  3119. 

  3120. static void vc1_decode_blocks(VC1Context *v)

  3121. {

  3122. 

  3123.     v->s.esc3_level_length = 0;

  3124. 

  3125.     switch(v->s.pict_type) {

  3126.     case I_TYPE:

  3127.         vc1_decode_i_blocks(v);

  3128.         break;

  3129.     case P_TYPE:

  3130.         vc1_decode_p_blocks(v);

  3131.         break;

  3132.     case B_TYPE:

  3133.         vc1_decode_b_blocks(v);

  3134.         break;

  3135.     }

  3136. }

  3137. 

  3138. 

  3139. /** Initialize a VC1/WMV3 decoder

  3140.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3141.  * @todo TODO: Decypher remaining bits in extra_data

  3142.  */

  3143. static int vc1_decode_init(AVCodecContext *avctx)

  3144. {

  3145.     VC1Context *v = avctx->priv_data;

  3146.     MpegEncContext *s = &v->s;

  3147.     GetBitContext gb;

  3148. 

  3149.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3150.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3151.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3152.     else

  3153.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3154.     v->s.avctx = avctx;

  3155.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3156.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3157. 

  3158.     if(ff_h263_decode_init(avctx) < 0)

  3159.         return -1;

  3160.     if (vc1_init_common(v) < 0) return -1;

  3161. 

  3162.     avctx->coded_width = avctx->width;

  3163.     avctx->coded_height = avctx->height;

  3164.     if (avctx->codec_id == CODEC_ID_WMV3)

  3165.     {

  3166.         int count = 0;

  3167. 

  3168.         // looks like WMV3 has a sequence header stored in the extradata

  3169.         // advanced sequence header may be before the first frame

  3170.         // the last byte of the extradata is a version number, 1 for the

  3171.         // samples we can decode

  3172. 

  3173.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3174. 

  3175.         if (decode_sequence_header(avctx, &gb) < 0)

  3176.           return -1;

  3177. 

  3178.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3179.         if (count>0)

  3180.         {

  3181.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3182.                    count, get_bits(&gb, count));

  3183.         }

  3184.         else if (count < 0)

  3185.         {

  3186.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3187.         }

  3188.     }

  3189.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3190. 

  3191.     s->mb_width = (avctx->coded_width+15)>>4;

  3192.     s->mb_height = (avctx->coded_height+15)>>4;

  3193. 

  3194.     /* Allocate mb bitplanes */

  3195.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3196.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3197. 

  3198.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3199.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3200.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3201.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3202.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3203. 

  3204.     /* Init coded blocks info */

  3205.     if (v->profile == PROFILE_ADVANCED)

  3206.     {

  3207. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3208. //            return -1;

  3209. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3210. //            return -1;

  3211.     }

  3212. 

  3213.     return 0;

  3214. }

  3215. 

  3216. 

  3217. /** Decode a VC1/WMV3 frame

  3218.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3219.  * @warning Initial try at using MpegEncContext stuff

  3220.  */

  3221. static int vc1_decode_frame(AVCodecContext *avctx,

  3222.                             void *data, int *data_size,

  3223.                             uint8_t *buf, int buf_size)

  3224. {

  3225.     VC1Context *v = avctx->priv_data;

  3226.     MpegEncContext *s = &v->s;

  3227.     AVFrame *pict = data;

  3228. 

  3229.     /* no supplementary picture */

  3230.     if (buf_size == 0) {

  3231.         /* special case for last picture */

  3232.         if (s->low_delay==0 && s->next_picture_ptr) {

  3233.             *pict= *(AVFrame*)s->next_picture_ptr;

  3234.             s->next_picture_ptr= NULL;

  3235. 

  3236.             *data_size = sizeof(AVFrame);

  3237.         }

  3238. 

  3239.         return 0;

  3240.     }

  3241. 

  3242.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  3243.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  3244.         int i= ff_find_unused_picture(s, 0);

  3245.         s->current_picture_ptr= &s->picture[i];

  3246.     }

  3247. 

  3248.     avctx->has_b_frames= !s->low_delay;

  3249. 

  3250.     init_get_bits(&s->gb, buf, buf_size*8);

  3251.     // do parse frame header

  3252.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  3253.         return -1;

  3254. 

  3255.     if(s->pict_type != I_TYPE && !v->res_rtm_flag)return -1;

  3256.     if(s->pict_type == B_TYPE)return -1;

  3257. 

  3258.     // for hurry_up==5

  3259.     s->current_picture.pict_type= s->pict_type;

  3260.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  3261. 

  3262.     /* skip B-frames if we don't have reference frames */

  3263.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  3264.     /* skip b frames if we are in a hurry */

  3265.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  3266.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  3267.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  3268.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  3269.         return buf_size;

  3270.     /* skip everything if we are in a hurry>=5 */

  3271.     if(avctx->hurry_up>=5) return -1;//buf_size;

  3272. 

  3273.     if(s->next_p_frame_damaged){

  3274.         if(s->pict_type==B_TYPE)

  3275.             return buf_size;

  3276.         else

  3277.             s->next_p_frame_damaged=0;

  3278.     }

  3279. 

  3280.     if(MPV_frame_start(s, avctx) < 0)

  3281.         return -1;

  3282. 

  3283.     ff_er_frame_start(s);

  3284. 

  3285.     v->bits = buf_size * 8;

  3286.     vc1_decode_blocks(v);

  3287. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  3288. //  if(get_bits_count(&s->gb) > buf_size * 8)

  3289. //      return -1;

  3290.     ff_er_frame_end(s);

  3291. 

  3292.     MPV_frame_end(s);

  3293. 

  3294. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  3295. assert(s->current_picture.pict_type == s->pict_type);

  3296.     if (s->pict_type == B_TYPE || s->low_delay) {

  3297.         *pict= *(AVFrame*)s->current_picture_ptr;

  3298.     } else if (s->last_picture_ptr != NULL) {

  3299.         *pict= *(AVFrame*)s->last_picture_ptr;

  3300.     }

  3301. 

  3302.     if(s->last_picture_ptr || s->low_delay){

  3303.         *data_size = sizeof(AVFrame);

  3304.         ff_print_debug_info(s, pict);

  3305.     }

  3306. 

  3307.     /* Return the Picture timestamp as the frame number */

  3308.     /* we substract 1 because it is added on utils.c    */

  3309.     avctx->frame_number = s->picture_number - 1;

  3310. 

  3311.     return buf_size;

  3312. }

  3313. 

  3314. 

  3315. /** Close a VC1/WMV3 decoder

  3316.  * @warning Initial try at using MpegEncContext stuff

  3317.  */

  3318. static int vc1_decode_end(AVCodecContext *avctx)

  3319. {

  3320.     VC1Context *v = avctx->priv_data;

  3321. 

  3322.     av_freep(&v->hrd_rate);

  3323.     av_freep(&v->hrd_buffer);

  3324.     MPV_common_end(&v->s);

  3325.     av_freep(&v->mv_type_mb_plane);

  3326.     av_freep(&v->direct_mb_plane);

  3327.     av_freep(&v->mb_type_base);

  3328.     return 0;

  3329. }

  3330. 

  3331. 

  3332. AVCodec vc1_decoder = {

  3333.     "vc1",

  3334.     CODEC_TYPE_VIDEO,

  3335.     CODEC_ID_VC1,

  3336.     sizeof(VC1Context),

  3337.     vc1_decode_init,

  3338.     NULL,

  3339.     vc1_decode_end,

  3340.     vc1_decode_frame,

  3341.     CODEC_CAP_DELAY,

  3342.     NULL

  3343. };

  3344. 

  3345. AVCodec wmv3_decoder = {

  3346.     "wmv3",

  3347.     CODEC_TYPE_VIDEO,

  3348.     CODEC_ID_WMV3,

  3349.     sizeof(VC1Context),

  3350.     vc1_decode_init,

  3351.     NULL,

  3352.     vc1_decode_end,

  3353.     vc1_decode_frame,

  3354.     CODEC_CAP_DELAY,

  3355.     NULL

  3356. };