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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2006 Konstantin Shishkov

  4.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  5.  *

  6.  * This library is free software; you can redistribute it and/or

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  *

  20.  */

  21. 

  22. /**

  23.  * @file vc1.c

  24.  * VC-1 and WMV3 decoder

  25.  *

  26.  */

  27. #include "common.h"

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1data.h"

  32. #include "vc1acdata.h"

  33. 

  34. #undef NDEBUG

  35. #include <assert.h>

  36. 

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

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

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

  40. #define MB_INTRA_VLC_BITS 9

  41. extern VLC ff_msmp4_mb_i_vlc;

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

  43. #define DC_VLC_BITS 9

  44. #define AC_VLC_BITS 9

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

  46. 

  47. 

  48. /** Available Profiles */

  49. //@{

  50. enum Profile {

  51.     PROFILE_SIMPLE,

  52.     PROFILE_MAIN,

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

  54.     PROFILE_ADVANCED

  55. };

  56. //@}

  57. 

  58. /** Sequence quantizer mode */

  59. //@{

  60. enum QuantMode {

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

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

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

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

  65. };

  66. //@}

  67. 

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

  69. //@{

  70. enum DQProfile {

  71.     DQPROFILE_FOUR_EDGES,

  72.     DQPROFILE_DOUBLE_EDGES,

  73.     DQPROFILE_SINGLE_EDGE,

  74.     DQPROFILE_ALL_MBS

  75. };

  76. //@}

  77. 

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

  79.  */

  80. //@{

  81. enum DQSingleEdge {

  82.     DQSINGLE_BEDGE_LEFT,

  83.     DQSINGLE_BEDGE_TOP,

  84.     DQSINGLE_BEDGE_RIGHT,

  85.     DQSINGLE_BEDGE_BOTTOM

  86. };

  87. //@}

  88. 

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

  90. //@{

  91. enum DQDoubleEdge {

  92.     DQDOUBLE_BEDGE_TOPLEFT,

  93.     DQDOUBLE_BEDGE_TOPRIGHT,

  94.     DQDOUBLE_BEDGE_BOTTOMRIGHT,

  95.     DQDOUBLE_BEDGE_BOTTOMLEFT

  96. };

  97. //@}

  98. 

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

  100. //@{

  101. enum MVModes {

  102.     MV_PMODE_1MV_HPEL_BILIN,

  103.     MV_PMODE_1MV,

  104.     MV_PMODE_1MV_HPEL,

  105.     MV_PMODE_MIXED_MV,

  106.     MV_PMODE_INTENSITY_COMP

  107. };

  108. //@}

  109. 

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

  111. //@{

  112. enum BMVTypes {

  113.     BMV_TYPE_BACKWARD,

  114.     BMV_TYPE_FORWARD,

  115.     BMV_TYPE_INTERPOLATED = 3 //XXX: ??

  116. };

  117. //@}

  118. 

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

  120. //@{

  121. enum TransformTypes {

  122.     TT_8X8,

  123.     TT_8X4_BOTTOM,

  124.     TT_8X4_TOP,

  125.     TT_8X4, //Both halves

  126.     TT_4X8_RIGHT,

  127.     TT_4X8_LEFT,

  128.     TT_4X8, //Both halves

  129.     TT_4X4

  130. };

  131. //@}

  132. 

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

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

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

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

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

  138. };

  139. 

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

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

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

  322. 

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

  324.     //@{

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

  326.     uint8_t interpfrm;

  327.     //@}

  328. 

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

  330.     //@{

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

  332.     uint8_t numpanscanwin;

  333.     uint8_t tfcntr;

  334.     uint8_t rptfrm, tff, rff;

  335.     uint16_t topleftx;

  336.     uint16_t toplefty;

  337.     uint16_t bottomrightx;

  338.     uint16_t bottomrighty;

  339.     uint8_t uvsamp;

  340.     uint8_t postproc;

  341.     int hrd_num_leaky_buckets;

  342.     uint8_t bit_rate_exponent;

  343.     uint8_t buffer_size_exponent;

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

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

  346.     uint8_t condover;

  347.     uint16_t *hrd_rate, *hrd_buffer;

  348.     uint8_t *hrd_fullness;

  349.     uint8_t range_mapy_flag;

  350.     uint8_t range_mapuv_flag;

  351.     uint8_t range_mapy;

  352.     uint8_t range_mapuv;

  353.     //@}

  354. } VC1Context;

  355. 

  356. /**

  357.  * Get unary code of limited length

  358.  * @fixme FIXME Slow and ugly

  359.  * @param gb GetBitContext

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

  361.  * @param[in] len Maximum length

  362.  * @return Unary length/index

  363.  */

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

  365. {

  366. #if 1

  367.     int i;

  368. 

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

  370.     return i;

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

  372. 

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

  374.   {

  375.     tmp = get_bits(gb, 1);

  376.     i++;

  377.   }

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

  379.   return i;*/

  380. #else

  381.   unsigned int buf;

  382.   int log;

  383. 

  384.   OPEN_READER(re, gb);

  385.   UPDATE_CACHE(re, gb);

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

  387.   if (stop) buf = ~buf;

  388. 

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

  390.   if (log < limit){

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

  392.     CLOSE_READER(re, gb);

  393.     return log;

  394.   }

  395. 

  396.   LAST_SKIP_BITS(re, gb, limit);

  397.   CLOSE_READER(re, gb);

  398.   return limit;

  399. #endif

  400. }

  401. 

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

  403.     int n;

  404.     n = get_bits1(gb);

  405.     if (n == 1)

  406.         return 0;

  407.     else

  408.         return 2 - get_bits1(gb);

  409. }

  410. 

  411. /**

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

  413.  * @param v The VC1Context to initialize

  414.  * @return Status

  415.  */

  416. static int vc1_init_common(VC1Context *v)

  417. {

  418.     static int done = 0;

  419.     int i = 0;

  420. 

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

  422. 

  423.     /* VLC tables */

  424.     if(!done)

  425.     {

  426.         done = 1;

  427.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  428.                  vc1_bfraction_bits, 1, 1,

  429.                  vc1_bfraction_codes, 1, 1, 1);

  430.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  431.                  vc1_norm2_bits, 1, 1,

  432.                  vc1_norm2_codes, 1, 1, 1);

  433.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  434.                  vc1_norm6_bits, 1, 1,

  435.                  vc1_norm6_codes, 2, 2, 1);

  436.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  437.                  vc1_imode_bits, 1, 1,

  438.                  vc1_imode_codes, 1, 1, 1);

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

  440.         {

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

  442.                      vc1_ttmb_bits[i], 1, 1,

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

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

  445.                      vc1_ttblk_bits[i], 1, 1,

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

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

  448.                      vc1_subblkpat_bits[i], 1, 1,

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

  450.         }

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

  452.         {

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

  454.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  457.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  460.                      vc1_mv_diff_bits[i], 1, 1,

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

  462.         }

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

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

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

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

  467.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  470.     }

  471. 

  472.     /* Other defaults */

  473.     v->pq = -1;

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

  475. 

  476.     return 0;

  477. }

  478. 

  479. /***********************************************************************/

  480. /**

  481.  * @defgroup bitplane VC9 Bitplane decoding

  482.  * @see 8.7, p56

  483.  * @{

  484.  */

  485. 

  486. /** @addtogroup bitplane

  487.  * Imode types

  488.  * @{

  489.  */

  490. enum Imode {

  491.     IMODE_RAW,

  492.     IMODE_NORM2,

  493.     IMODE_DIFF2,

  494.     IMODE_NORM6,

  495.     IMODE_DIFF6,

  496.     IMODE_ROWSKIP,

  497.     IMODE_COLSKIP

  498. };

  499. /** @} */ //imode defines

  500. 

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

  502.  * @param plane Buffer to store decoded bits

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

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

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

  506.  */

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

  508.     int x, y;

  509. 

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

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

  512.             memset(plane, 0, width);

  513.         else

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

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

  516.         plane += stride;

  517.     }

  518. }

  519. 

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

  521.  * @param plane Buffer to store decoded bits

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

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

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

  525.  * @fixme FIXME: Optimize

  526.  */

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

  528.     int x, y;

  529. 

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

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

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

  533.                 plane[y*stride] = 0;

  534.         else

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

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

  537.         plane ++;

  538.     }

  539. }

  540. 

  541. /** Decode a bitplane's bits

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

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

  544.  * @return Status

  545.  * @fixme FIXME: Optimize

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

  547.  */

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

  549. {

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

  551. 

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

  553.     uint8_t invert, *planep = data;

  554.     int width, height, stride;

  555. 

  556.     width = v->s.mb_width;

  557.     height = v->s.mb_height;

  558.     stride = v->s.mb_stride;

  559.     invert = get_bits(gb, 1);

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

  561. 

  562.     *raw_flag = 0;

  563.     switch (imode)

  564.     {

  565.     case IMODE_RAW:

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

  567.         *raw_flag = 1; //invert ignored

  568.         return invert;

  569.     case IMODE_DIFF2:

  570.     case IMODE_NORM2:

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

  572.         {

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

  574.             offset = 1;

  575.         }

  576.         else offset = 0;

  577.         // decode bitplane as one long line

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

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

  580.             *planep++ = code & 1;

  581.             offset++;

  582.             if(offset == width) {

  583.                 offset = 0;

  584.                 planep += stride - width;

  585.             }

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

  587.             offset++;

  588.             if(offset == width) {

  589.                 offset = 0;

  590.                 planep += stride - width;

  591.             }

  592.         }

  593.         break;

  594.     case IMODE_DIFF6:

  595.     case IMODE_NORM6:

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

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

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

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

  600.                     if(code < 0){

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

  602.                         return -1;

  603.                     }

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

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

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

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

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

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

  610.                 }

  611.                 planep += stride * 3;

  612.             }

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

  614.         } else { // 3x2

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

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

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

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

  619.                     if(code < 0){

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

  621.                         return -1;

  622.                     }

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

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

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

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

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

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

  629.                 }

  630.                 planep += stride * 2;

  631.             }

  632.             x = width % 3;

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

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

  635.         }

  636.         break;

  637.     case IMODE_ROWSKIP:

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

  639.         break;

  640.     case IMODE_COLSKIP:

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

  642.         break;

  643.     default: break;

  644.     }

  645. 

  646.     /* Applying diff operator */

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

  648.     {

  649.         planep = data;

  650.         planep[0] ^= invert;

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

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

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

  654.         {

  655.             planep += stride;

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

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

  658.             {

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

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

  661.             }

  662.         }

  663.     }

  664.     else if (invert)

  665.     {

  666.         planep = data;

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

  668.     }

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

  670. }

  671. 

  672. /** @} */ //Bitplane group

  673. 

  674. /***********************************************************************/

  675. /** VOP Dquant decoding

  676.  * @param v VC-1 Context

  677.  */

  678. static int vop_dquant_decoding(VC1Context *v)

  679. {

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

  681.     int pqdiff;

  682. 

  683.     //variable size

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

  685.     {

  686.         pqdiff = get_bits(gb, 3);

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

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

  689.     }

  690.     else

  691.     {

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

  693.         if ( v->dquantfrm )

  694.         {

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

  696.             switch (v->dqprofile)

  697.             {

  698.             case DQPROFILE_SINGLE_EDGE:

  699.             case DQPROFILE_DOUBLE_EDGES:

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

  701.                 break;

  702.             case DQPROFILE_ALL_MBS:

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

  704.             default: break; //Forbidden ?

  705.             }

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

  707.             {

  708.                 pqdiff = get_bits(gb, 3);

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

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

  711.             }

  712.         }

  713.     }

  714.     return 0;

  715. }

  716. 

  717. 

  718. /** Do inverse transform

  719.  */

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

  721. {

  722.     int i;

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

  724.     DCTELEM *src, *dst;

  725. 

  726.     src = block;

  727.     dst = block;

  728.     if(M==4){

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

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

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

  732.             t3 = 22 * src[1];

  733.             t4 = 22 * src[3];

  734.             t5 = 10 * src[1];

  735.             t6 = 10 * src[3];

  736. 

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

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

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

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

  741. 

  742.             src += 8;

  743.             dst += 8;

  744.         }

  745.     }else{

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

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

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

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

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

  751. 

  752.             t5 = t1 + t3;

  753.             t6 = t2 + t4;

  754.             t7 = t2 - t4;

  755.             t8 = t1 - t3;

  756. 

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

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

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

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

  761. 

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

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

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

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

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

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

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

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

  770. 

  771.             src += 8;

  772.             dst += 8;

  773.         }

  774.     }

  775. 

  776.     src = block;

  777.     dst = block;

  778.     if(N==4){

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

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

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

  782.             t3 = 22 * src[ 8];

  783.             t4 = 22 * src[24];

  784.             t5 = 10 * src[ 8];

  785.             t6 = 10 * src[24];

  786. 

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

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

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

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

  791. 

  792.             src ++;

  793.             dst ++;

  794.         }

  795.     }else{

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

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

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

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

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

  801. 

  802.             t5 = t1 + t3;

  803.             t6 = t2 + t4;

  804.             t7 = t2 - t4;

  805.             t8 = t1 - t3;

  806. 

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

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

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

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

  811. 

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

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

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

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

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

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

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

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

  820. 

  821.             src++;

  822.             dst++;

  823.         }

  824.     }

  825. }

  826. 

  827. /** Apply overlap transform

  828.  * @todo optimize

  829.  * @todo move to DSPContext

  830.  */

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

  832. {

  833.     int i;

  834. 

  835.     if(do_hor) { //TODO

  836.     }

  837.     if(do_vert) { //TODO

  838.     }

  839. 

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

  841.         block[i] += 128;

  842. }

  843. 

  844. 

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

  846. {

  847.     int i;

  848.     int a, b, c, d;

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

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

  851.         b = src[-stride];

  852.         c = src[0];

  853.         d = src[stride];

  854. 

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

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

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

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

  859.         src++;

  860.     }

  861. }

  862. 

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

  864. {

  865.     int i;

  866.     int a, b, c, d;

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

  868.         a = src[-2];

  869.         b = src[-1];

  870.         c = src[0];

  871.         d = src[1];

  872. 

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

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

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

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

  877.         src += stride;

  878.     }

  879. }

  880. 

  881. /** Put block onto picture

  882.  * @todo move to DSPContext

  883.  */

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

  885. {

  886.     uint8_t *Y;

  887.     int ys, us, vs;

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

  889. 

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

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

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

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

  894. 

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

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

  897.     Y += ys * 8;

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

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

  900. 

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

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

  903. }

  904. 

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

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

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

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

  909. 

  910. /** Do motion compensation over 1 macroblock

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

  912.  */

  913. static void vc1_mc_1mv(VC1Context *v)

  914. {

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

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

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

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

  919. 

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

  921. 

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

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

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

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

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

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

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

  929. 

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

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

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

  933.     }

  934. 

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

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

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

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

  939. 

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

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

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

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

  944. 

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

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

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

  948. 

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

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

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

  952. 

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

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

  955.         srcY = s->edge_emu_buffer;

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

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

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

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

  960.         srcU = uvbuf;

  961.         srcV = uvbuf + 16;

  962.     }

  963. 

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

  965.         mx >>= 1;

  966.         my >>= 1;

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

  968.         uvdxy = 0;

  969. 

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

  971.     } else {

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

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

  974. 

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

  976.     }

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

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

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

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

  981. }

  982. 

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

  984.  */

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

  986. {

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

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

  989.     uint8_t *srcY;

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

  991.     int off;

  992. 

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

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

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

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

  997. 

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

  999. 

  1000.     src_x = s->mb_x * 16 + (n&1) * 8 + (mx >> 2);

  1001.     src_y = s->mb_y * 16 + (n&2) * 4 + (my >> 2);

  1002. 

  1003.     CLIP_RANGE(src_x, s->mb_x, s->mb_width  * 16, 16);

  1004.     CLIP_RANGE(src_y, s->mb_y, s->mb_height * 16, 16);

  1005. 

  1006.     srcY += src_y * s->linesize + src_x;

  1007. 

  1008.     if((unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1009.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1010.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 16+1, 16+1,

  1011.                             src_x, src_y, s->h_edge_pos, s->v_edge_pos);

  1012.         srcY = s->edge_emu_buffer;

  1013.     }

  1014. 

  1015.     if(!s->quarter_sample) { // hpel mc

  1016.         mx >>= 1;

  1017.         my >>= 1;

  1018.         dxy = ((my & 1) << 1) | (mx & 1);

  1019. 

  1020.         dsp->put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  1021.     } else {

  1022.         dxy = ((my & 3) << 2) | (mx & 3);

  1023. 

  1024.         dsp->put_no_rnd_qpel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize);

  1025.     }

  1026. }

  1027. 

  1028. static inline int median4(int a, int b, int c, int d)

  1029. {

  1030.     if(a < b) {

  1031.         if(c < d) return (FFMIN(b, d) + FFMAX(a, c)) >> 1;

  1032.         else      return (FFMIN(b, c) + FFMAX(a, d)) >> 1;

  1033.     } else {

  1034.         if(c < d) return (FFMIN(a, d) + FFMAX(b, c)) >> 1;

  1035.         else      return (FFMIN(a, c) + FFMAX(b, d)) >> 1;

  1036.     }

  1037. }

  1038. 

  1039. 

  1040. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1041.  */

  1042. static void vc1_mc_4mv_chroma(VC1Context *v)

  1043. {

  1044.     MpegEncContext *s = &v->s;

  1045.     DSPContext *dsp = &v->s.dsp;

  1046.     uint8_t *srcU, *srcV;

  1047.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1048.     int i, idx, tx = 0, ty = 0;

  1049.     int mvx[4], mvy[4], intra[4];

  1050.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1051. 

  1052.     if(!v->s.last_picture.data[0])return;

  1053. 

  1054.     for(i = 0; i < 4; i++) {

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

  1056.         mvy[i] = s->mv[0][i][1];

  1057.         intra[i] = v->mb_type[0][s->block_index[i]];

  1058.     }

  1059. 

  1060.     /* calculate chroma MV vector from four luma MVs */

  1061.     idx = (intra[0] << 3) | (intra[1] << 2) | (intra[2] << 1) | intra[3];

  1062.     if(!idx) { // all blocks are inter

  1063.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1064.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1065.     } else if(count[idx] == 1) { // 3 inter blocks

  1066.         switch(idx) {

  1067.         case 0x1:

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

  1069.             tx = mid_pred(mvy[1], mvy[2], mvy[3]);

  1070.             break;

  1071.         case 0x2:

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

  1073.             tx = mid_pred(mvy[0], mvy[2], mvy[3]);

  1074.             break;

  1075.         case 0x4:

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

  1077.             tx = mid_pred(mvy[0], mvy[1], mvy[3]);

  1078.             break;

  1079.         case 0x8:

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

  1081.             tx = mid_pred(mvy[0], mvy[1], mvy[2]);

  1082.             break;

  1083.         }

  1084.     } else if(count[idx] == 2) {

  1085.         int t1 = 0, t2 = 0;

  1086.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1087.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1088.         tx = (mvx[t1] + mvx[t2]) >> 1;

  1089.         ty = (mvy[t1] + mvy[t2]) >> 1;

  1090.     } else

  1091.         return; //no need to do MC for inter blocks

  1092. 

  1093.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1094.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1095. 

  1096.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1097.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1098. 

  1099.     CLIP_RANGE(uvsrc_x, s->mb_x, s->mb_width  *  8,  8);

  1100.     CLIP_RANGE(uvsrc_y, s->mb_y, s->mb_height *  8,  8);

  1101.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1102.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1103.     if((unsigned)uvsrc_x > (s->h_edge_pos >> 1) - ((uvmx >> 1)&1) - 8

  1104.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - ((uvmy >> 1)&1) - 8){

  1105.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1106.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1107.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1108.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1109.         srcU = s->edge_emu_buffer;

  1110.         srcV = s->edge_emu_buffer + 16;

  1111.     }

  1112. 

  1113.     if(!s->quarter_sample) // hpel mc

  1114.         uvdxy = 0;

  1115.     else

  1116.         uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);

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

  1118.     dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);

  1119. }

  1120. 

  1121. /**

  1122.  * Decode Simple/Main Profiles sequence header

  1123.  * @see Figure 7-8, p16-17

  1124.  * @param avctx Codec context

  1125.  * @param gb GetBit context initialized from Codec context extra_data

  1126.  * @return Status

  1127.  */

  1128. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1129. {

  1130.     VC1Context *v = avctx->priv_data;

  1131. 

  1132.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1133.     v->profile = get_bits(gb, 2);

  1134.     if (v->profile == 2)

  1135.     {

  1136.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1137.         return -1;

  1138.     }

  1139. 

  1140.     if (v->profile == PROFILE_ADVANCED)

  1141.     {

  1142.         v->level = get_bits(gb, 3);

  1143.         if(v->level >= 5)

  1144.         {

  1145.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1146.         }

  1147.         v->chromaformat = get_bits(gb, 2);

  1148.         if (v->chromaformat != 1)

  1149.         {

  1150.             av_log(avctx, AV_LOG_ERROR,

  1151.                    "Only 4:2:0 chroma format supported\n");

  1152.             return -1;

  1153.         }

  1154.     }

  1155.     else

  1156.     {

  1157.         v->res_sm = get_bits(gb, 2); //reserved

  1158.         if (v->res_sm)

  1159.         {

  1160.             av_log(avctx, AV_LOG_ERROR,

  1161.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1162.             return -1;

  1163.         }

  1164.     }

  1165. 

  1166.     // (fps-2)/4 (->30)

  1167.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1168.     // (bitrate-32kbps)/64kbps

  1169.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1170.     v->s.loop_filter = get_bits(gb, 1); //common

  1171.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1172.     {

  1173.         av_log(avctx, AV_LOG_ERROR,

  1174.                "LOOPFILTER shell not be enabled in simple profile\n");

  1175.     }

  1176. 

  1177.     if (v->profile < PROFILE_ADVANCED)

  1178.     {

  1179.         v->res_x8 = get_bits(gb, 1); //reserved

  1180.         if (v->res_x8)

  1181.         {

  1182.             av_log(avctx, AV_LOG_ERROR,

  1183.                    "1 for reserved RES_X8 is forbidden\n");

  1184.             //return -1;

  1185.         }

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

  1187.         v->res_fasttx = get_bits(gb, 1);

  1188.         if (!v->res_fasttx)

  1189.         {

  1190.             av_log(avctx, AV_LOG_ERROR,

  1191.                    "0 for reserved RES_FASTTX is forbidden\n");

  1192.             //return -1;

  1193.         }

  1194.     }

  1195. 

  1196.     v->fastuvmc =  get_bits(gb, 1); //common

  1197.     if (!v->profile && !v->fastuvmc)

  1198.     {

  1199.         av_log(avctx, AV_LOG_ERROR,

  1200.                "FASTUVMC unavailable in Simple Profile\n");

  1201.         return -1;

  1202.     }

  1203.     v->extended_mv =  get_bits(gb, 1); //common

  1204.     if (!v->profile && v->extended_mv)

  1205.     {

  1206.         av_log(avctx, AV_LOG_ERROR,

  1207.                "Extended MVs unavailable in Simple Profile\n");

  1208.         return -1;

  1209.     }

  1210.     v->dquant =  get_bits(gb, 2); //common

  1211.     v->vstransform =  get_bits(gb, 1); //common

  1212. 

  1213.     if (v->profile < PROFILE_ADVANCED)

  1214.     {

  1215.         v->res_transtab = get_bits(gb, 1);

  1216.         if (v->res_transtab)

  1217.         {

  1218.             av_log(avctx, AV_LOG_ERROR,

  1219.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1220.             return -1;

  1221.         }

  1222.     }

  1223. 

  1224.     v->overlap = get_bits(gb, 1); //common

  1225. 

  1226.     if (v->profile < PROFILE_ADVANCED)

  1227.     {

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

  1229.         v->rangered = get_bits(gb, 1);

  1230.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1231.         {

  1232.             av_log(avctx, AV_LOG_INFO,

  1233.                    "RANGERED should be set to 0 in simple profile\n");

  1234.         }

  1235.     }

  1236. 

  1237.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1238.     v->quantizer_mode = get_bits(gb, 2); //common

  1239. 

  1240.     if (v->profile < PROFILE_ADVANCED)

  1241.     {

  1242.         v->finterpflag = get_bits(gb, 1); //common

  1243.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1244.         if (!v->res_rtm_flag)

  1245.         {

  1246.             av_log(avctx, AV_LOG_ERROR,

  1247.                    "0 for reserved RES_RTM_FLAG is forbidden\n");

  1248.             //return -1;

  1249.         }

  1250.         av_log(avctx, AV_LOG_DEBUG,

  1251.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1252.                "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"

  1253.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1254.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1255.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1256.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1257.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1258.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1259.                );

  1260.         return 0;

  1261.     }

  1262.     return -1;

  1263. }

  1264. 

  1265. 

  1266. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1267. {

  1268.     int pqindex, lowquant, status;

  1269. 

  1270.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1271.     skip_bits(gb, 2); //framecnt unused

  1272.     v->rangeredfrm = 0;

  1273.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1274.     v->s.pict_type = get_bits(gb, 1);

  1275.     if (v->s.avctx->max_b_frames) {

  1276.         if (!v->s.pict_type) {

  1277.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1278.             else v->s.pict_type = B_TYPE;

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

  1280.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1281. 

  1282.     if(v->s.pict_type == I_TYPE)

  1283.         get_bits(gb, 7); // skip buffer fullness

  1284. 

  1285.     /* Quantizer stuff */

  1286.     pqindex = get_bits(gb, 5);

  1287.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1288.         v->pq = pquant_table[0][pqindex];

  1289.     else

  1290.         v->pq = pquant_table[v->quantizer_mode-1][pqindex];

  1291. 

  1292.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1293.         v->pquantizer = pqindex < 9;

  1294.     if (v->quantizer_mode == QUANT_UNIFORM || v->quantizer_mode == QUANT_NON_UNIFORM)

  1295.         v->pquantizer = v->quantizer_mode == QUANT_UNIFORM;

  1296.     v->pqindex = pqindex;

  1297.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1298.     else v->halfpq = 0;

  1299.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1300.         v->pquantizer = get_bits(gb, 1);

  1301.     v->dquantfrm = 0;

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

  1314.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1315.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1316.         v->range_x = 1 << (v->k_x - 1);

  1317.         v->range_y = 1 << (v->k_y - 1);

  1318.         if (v->profile == PROFILE_ADVANCED)

  1319.         {

  1320.             if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1321.         }

  1322.         else

  1323.             if (v->multires) v->respic = get_bits(gb, 2);

  1324.         lowquant = (v->pq > 12) ? 0 : 1;

  1325.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1326.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1327.         {

  1328.             v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];

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

  1330.             v->lumshift = get_bits(gb, 6);

  1331.         }

  1332.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1333.             v->s.quarter_sample = 0;

  1334.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1335.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1336.                 v->s.quarter_sample = 0;

  1337.             else

  1338.                 v->s.quarter_sample = 1;

  1339.         } else

  1340.             v->s.quarter_sample = 1;

  1341. 

  1342.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1343.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1344.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1345.         {

  1346.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1347.             if (status < 0) return -1;

  1348.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1349.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1350.         } else {

  1351.             v->mv_type_is_raw = 0;

  1352.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1353.         }

  1354.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

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

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

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

  1358. 

  1359.         /* Hopefully this is correct for P frames */

  1360.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1361.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1362. 

  1363.         if (v->dquant)

  1364.         {

  1365.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1366.             vop_dquant_decoding(v);

  1367.         }

  1368. 

  1369.         v->ttfrm = 0; //FIXME Is that so ?

  1370.         if (v->vstransform)

  1371.         {

  1372.             v->ttmbf = get_bits(gb, 1);

  1373.             if (v->ttmbf)

  1374.             {

  1375.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1376.             }

  1377.         }

  1378.         break;

  1379.     case B_TYPE:

  1380.         break;

  1381.     }

  1382. 

  1383.     /* AC Syntax */

  1384.     v->c_ac_table_index = decode012(gb);

  1385.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1386.     {

  1387.         v->y_ac_table_index = decode012(gb);

  1388.     }

  1389.     /* DC Syntax */

  1390.     v->s.dc_table_index = get_bits(gb, 1);

  1391. 

  1392.     return 0;

  1393. }

  1394. 

  1395. /***********************************************************************/

  1396. /**

  1397.  * @defgroup block VC-1 Block-level functions

  1398.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1399.  * @todo TODO: Integrate to MpegEncContext facilities

  1400.  * @{

  1401.  */

  1402. 

  1403. /**

  1404.  * @def GET_MQUANT

  1405.  * @brief Get macroblock-level quantizer scale

  1406.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1407.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1408.  */

  1409. #define GET_MQUANT()                                           \

  1410.   if (v->dquantfrm)                                            \

  1411.   {                                                            \

  1412.     int edges = 0;                                             \

  1413.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1414.     {                                                          \

  1415.       if (v->dqbilevel)                                        \

  1416.       {                                                        \

  1417.         mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \

  1418.       }                                                        \

  1419.       else                                                     \

  1420.       {                                                        \

  1421.         mqdiff = get_bits(gb, 3);                              \

  1422.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1423.         else mquant = get_bits(gb, 5);                         \

  1424.       }                                                        \

  1425.     }                                                          \

  1426.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1427.         edges = 1 << v->dqsbedge;                              \

  1428.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1429.         edges = (3 << v->dqsbedge) % 15;                       \

  1430.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1431.         edges = 15;                                            \

  1432.     mquant = v->pq;                                            \

  1433.     if((edges&1) && !s->mb_x)                                  \

  1434.         mquant = v->altpq;                                     \

  1435.     if((edges&2) && !s->mb_y)                                  \

  1436.         mquant = v->altpq;                                     \

  1437.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1438.         mquant = v->altpq;                                     \

  1439.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1440.         mquant = v->altpq;                                     \

  1441.   }

  1442. 

  1443. /**

  1444.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1445.  * @brief Get MV differentials

  1446.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1447.  * @param _dmv_x Horizontal differential for decoded MV

  1448.  * @param _dmv_y Vertical differential for decoded MV

  1449.  * @todo TODO: Use MpegEncContext arrays to store them

  1450.  */

  1451. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1452.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1453.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1454.   if (index > 36)                                                   \

  1455.   {                                                                 \

  1456.     mb_has_coeffs = 1;                                              \

  1457.     index -= 37;                                                    \

  1458.   }                                                                 \

  1459.   else mb_has_coeffs = 0;                                           \

  1460.   s->mb_intra = 0;                                                  \

  1461.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1462.   else if (index == 35)                                             \

  1463.   {                                                                 \

  1464.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1465.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1466.   }                                                                 \

  1467.   else if (index == 36)                                             \

  1468.   {                                                                 \

  1469.     _dmv_x = 0;                                                     \

  1470.     _dmv_y = 0;                                                     \

  1471.     s->mb_intra = 1;                                                \

  1472.   }                                                                 \

  1473.   else                                                              \

  1474.   {                                                                 \

  1475.     index1 = index%6;                                               \

  1476.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1477.     else                                   val = 0;                 \

  1478.     if(size_table[index1] - val > 0)                                \

  1479.         val = get_bits(gb, size_table[index1] - val);               \

  1480.     else                                   val = 0;                 \

  1481.     sign = 0 - (val&1);                                             \

  1482.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1483.                                                                     \

  1484.     index1 = index/6;                                               \

  1485.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1486.     else                                   val = 0;                 \

  1487.     if(size_table[index1] - val > 0)                                \

  1488.         val = get_bits(gb, size_table[index1] - val);               \

  1489.     else                                   val = 0;                 \

  1490.     sign = 0 - (val&1);                                             \

  1491.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1492.   }

  1493. 

  1494. /** Predict and set motion vector

  1495.  */

  1496. 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)

  1497. {

  1498.     int xy, wrap, off = 0;

  1499.     int16_t *A, *B, *C;

  1500.     int px, py;

  1501.     int sum;

  1502. 

  1503.     /* scale MV difference to be quad-pel */

  1504.     dmv_x <<= 1 - s->quarter_sample;

  1505.     dmv_y <<= 1 - s->quarter_sample;

  1506. 

  1507.     wrap = s->b8_stride;

  1508.     xy = s->block_index[n];

  1509. 

  1510.     if(s->mb_intra){

  1511.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1512.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1513.         if(mv1) { /* duplicate motion data for 1-MV block */

  1514.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1515.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1516.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1517.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1518.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1519.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1520.         }

  1521.         return;

  1522.     }

  1523. 

  1524.     C = s->current_picture.motion_val[0][xy - 1];

  1525.     A = s->current_picture.motion_val[0][xy - wrap];

  1526.     if(mv1)

  1527.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1528.     else {

  1529.         //in 4-MV mode different blocks have different B predictor position

  1530.         switch(n){

  1531.         case 0:

  1532.             off = (s->mb_x > 0) ? -1 : 1;

  1533.             break;

  1534.         case 1:

  1535.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1536.             break;

  1537.         case 2:

  1538.             off = 1;

  1539.             break;

  1540.         case 3:

  1541.             off = -1;

  1542.         }

  1543.     }

  1544.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1545. 

  1546.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1547.         if(s->mb_width == 1) {

  1548.             px = A[0];

  1549.             py = A[1];

  1550.         } else {

  1551.             px = mid_pred(A[0], B[0], C[0]);

  1552.             py = mid_pred(A[1], B[1], C[1]);

  1553.         }

  1554.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1555.         px = C[0];

  1556.         py = C[1];

  1557.     } else {

  1558.         px = py = 0;

  1559.     }

  1560.     /* Pullback MV as specified in 8.3.5.3.4 */

  1561.     {

  1562.         int qx, qy, X, Y;

  1563.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1564.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1565.         X = (s->mb_width << 6) - 4;

  1566.         Y = (s->mb_height << 6) - 4;

  1567.         if(mv1) {

  1568.             if(qx + px < -60) px = -60 - qx;

  1569.             if(qy + py < -60) py = -60 - qy;

  1570.         } else {

  1571.             if(qx + px < -28) px = -28 - qx;

  1572.             if(qy + py < -28) py = -28 - qy;

  1573.         }

  1574.         if(qx + px > X) px = X - qx;

  1575.         if(qy + py > Y) py = Y - qy;

  1576.     }

  1577.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1578.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1579.         if(is_intra[xy - wrap])

  1580.             sum = ABS(px) + ABS(py);

  1581.         else

  1582.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1583.         if(sum > 32) {

  1584.             if(get_bits1(&s->gb)) {

  1585.                 px = A[0];

  1586.                 py = A[1];

  1587.             } else {

  1588.                 px = C[0];

  1589.                 py = C[1];

  1590.             }

  1591.         } else {

  1592.             if(is_intra[xy - 1])

  1593.                 sum = ABS(px) + ABS(py);

  1594.             else

  1595.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1596.             if(sum > 32) {

  1597.                 if(get_bits1(&s->gb)) {

  1598.                     px = A[0];

  1599.                     py = A[1];

  1600.                 } else {

  1601.                     px = C[0];

  1602.                     py = C[1];

  1603.                 }

  1604.             }

  1605.         }

  1606.     }

  1607.     /* store MV using signed modulus of MV range defined in 4.11 */

  1608.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1609.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1610.     if(mv1) { /* duplicate motion data for 1-MV block */

  1611.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1612.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1613.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1614.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1615.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1616.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1617.     }

  1618. }

  1619. 

  1620. /** Get predicted DC value for I-frames only

  1621.  * prediction dir: left=0, top=1

  1622.  * @param s MpegEncContext

  1623.  * @param[in] n block index in the current MB

  1624.  * @param dc_val_ptr Pointer to DC predictor

  1625.  * @param dir_ptr Prediction direction for use in AC prediction

  1626.  */

  1627. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1628.                               int16_t **dc_val_ptr, int *dir_ptr)

  1629. {

  1630.     int a, b, c, wrap, pred, scale;

  1631.     int16_t *dc_val;

  1632.     static const uint16_t dcpred[32] = {

  1633.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1634.          114,  102,   93,   85,   79,   73,   68,   64,

  1635.           60,   57,   54,   51,   49,   47,   45,   43,

  1636.           41,   39,   38,   37,   35,   34,   33

  1637.     };

  1638. 

  1639.     /* find prediction - wmv3_dc_scale always used here in fact */

  1640.     if (n < 4)     scale = s->y_dc_scale;

  1641.     else           scale = s->c_dc_scale;

  1642. 

  1643.     wrap = s->block_wrap[n];

  1644.     dc_val= s->dc_val[0] + s->block_index[n];

  1645. 

  1646.     /* B A

  1647.      * C X

  1648.      */

  1649.     c = dc_val[ - 1];

  1650.     b = dc_val[ - 1 - wrap];

  1651.     a = dc_val[ - wrap];

  1652. 

  1653.     if (pq < 9 || !overlap)

  1654.     {

  1655.         /* Set outer values */

  1656.         if (!s->mb_y && (n!=2 && n!=3)) b=a=dcpred[scale];

  1657.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1658.     }

  1659.     else

  1660.     {

  1661.         /* Set outer values */

  1662.         if (!s->mb_y && (n!=2 && n!=3)) b=a=0;

  1663.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1664.     }

  1665. 

  1666.     if (abs(a - b) <= abs(b - c)) {

  1667.         pred = c;

  1668.         *dir_ptr = 1;//left

  1669.     } else {

  1670.         pred = a;

  1671.         *dir_ptr = 0;//top

  1672.     }

  1673. 

  1674.     /* update predictor */

  1675.     *dc_val_ptr = &dc_val[0];

  1676.     return pred;

  1677. }

  1678. 

  1679. 

  1680. /** Get predicted DC value

  1681.  * prediction dir: left=0, top=1

  1682.  * @param s MpegEncContext

  1683.  * @param[in] n block index in the current MB

  1684.  * @param dc_val_ptr Pointer to DC predictor

  1685.  * @param dir_ptr Prediction direction for use in AC prediction

  1686.  */

  1687. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1688.                               int a_avail, int c_avail,

  1689.                               int16_t **dc_val_ptr, int *dir_ptr)

  1690. {

  1691.     int a, b, c, wrap, pred, scale;

  1692.     int16_t *dc_val;

  1693.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1694.     int mb_pos2, q1, q2;

  1695. 

  1696.     /* find prediction - wmv3_dc_scale always used here in fact */

  1697.     if (n < 4)     scale = s->y_dc_scale;

  1698.     else           scale = s->c_dc_scale;

  1699. 

  1700.     wrap = s->block_wrap[n];

  1701.     dc_val= s->dc_val[0] + s->block_index[n];

  1702. 

  1703.     /* B A

  1704.      * C X

  1705.      */

  1706.     c = dc_val[ - 1];

  1707.     b = dc_val[ - 1 - wrap];

  1708.     a = dc_val[ - wrap];

  1709. 

  1710.     if(a_avail && c_avail) {

  1711.         if(abs(a - b) <= abs(b - c)) {

  1712.             pred = c;

  1713.             *dir_ptr = 1;//left

  1714.         } else {

  1715.             pred = a;

  1716.             *dir_ptr = 0;//top

  1717.         }

  1718.     } else if(a_avail) {

  1719.         pred = a;

  1720.         *dir_ptr = 0;//top

  1721.     } else if(c_avail) {

  1722.         pred = c;

  1723.         *dir_ptr = 1;//left

  1724.     } else {

  1725.         pred = 0;

  1726.         *dir_ptr = 1;//left

  1727.     }

  1728. 

  1729.     /* scale coeffs if needed

  1730.     mb_pos2 = mb_pos - *dir_ptr - (1 - *dir_ptr) * s->mb_stride;

  1731.     q1 = s->y_dc_scale_table[s->current_picture.qscale_table[mb_pos]];

  1732.     q2 = s->y_dc_scale_table[s->current_picture.qscale_table[mb_pos2]];

  1733.     if(q2 && q1!=q2 && ((*dir_ptr && c_avail) || (!*dir_ptr && a_avail))) {

  1734.         pred = (pred * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1735.     } */

  1736. 

  1737.     /* update predictor */

  1738.     *dc_val_ptr = &dc_val[0];

  1739.     return pred;

  1740. }

  1741. 

  1742. 

  1743. /**

  1744.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1745.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1746.  * @todo TODO: Integrate to MpegEncContext facilities

  1747.  * @{

  1748.  */

  1749. 

  1750. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1751. {

  1752.     int xy, wrap, pred, a, b, c;

  1753. 

  1754.     xy = s->block_index[n];

  1755.     wrap = s->b8_stride;

  1756. 

  1757.     /* B C

  1758.      * A X

  1759.      */

  1760.     a = s->coded_block[xy - 1       ];

  1761.     b = s->coded_block[xy - 1 - wrap];

  1762.     c = s->coded_block[xy     - wrap];

  1763. 

  1764.     if (b == c) {

  1765.         pred = a;

  1766.     } else {

  1767.         pred = c;

  1768.     }

  1769. 

  1770.     /* store value */

  1771.     *coded_block_ptr = &s->coded_block[xy];

  1772. 

  1773.     return pred;

  1774. }

  1775. 

  1776. /**

  1777.  * Decode one AC coefficient

  1778.  * @param v The VC1 context

  1779.  * @param last Last coefficient

  1780.  * @param skip How much zero coefficients to skip

  1781.  * @param value Decoded AC coefficient value

  1782.  * @see 8.1.3.4

  1783.  */

  1784. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1785. {

  1786.     GetBitContext *gb = &v->s.gb;

  1787.     int index, escape, run = 0, level = 0, lst = 0;

  1788. 

  1789.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1790.     if (index != vc1_ac_sizes[codingset] - 1) {

  1791.         run = vc1_index_decode_table[codingset][index][0];

  1792.         level = vc1_index_decode_table[codingset][index][1];

  1793.         lst = index >= vc1_last_decode_table[codingset];

  1794.         if(get_bits(gb, 1))

  1795.             level = -level;

  1796.     } else {

  1797.         escape = decode210(gb);

  1798.         if (escape != 2) {

  1799.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1800.             run = vc1_index_decode_table[codingset][index][0];

  1801.             level = vc1_index_decode_table[codingset][index][1];

  1802.             lst = index >= vc1_last_decode_table[codingset];

  1803.             if(escape == 0) {

  1804.                 if(lst)

  1805.                     level += vc1_last_delta_level_table[codingset][run];

  1806.                 else

  1807.                     level += vc1_delta_level_table[codingset][run];

  1808.             } else {

  1809.                 if(lst)

  1810.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  1811.                 else

  1812.                     run += vc1_delta_run_table[codingset][level] + 1;

  1813.             }

  1814.             if(get_bits(gb, 1))

  1815.                 level = -level;

  1816.         } else {

  1817.             int sign;

  1818.             lst = get_bits(gb, 1);

  1819.             if(v->s.esc3_level_length == 0) {

  1820.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1821.                     v->s.esc3_level_length = get_bits(gb, 3);

  1822.                     if(!v->s.esc3_level_length)

  1823.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1824.                 } else { //table 60

  1825.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1826.                 }

  1827.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1828.             }

  1829.             run = get_bits(gb, v->s.esc3_run_length);

  1830.             sign = get_bits(gb, 1);

  1831.             level = get_bits(gb, v->s.esc3_level_length);

  1832.             if(sign)

  1833.                 level = -level;

  1834.         }

  1835.     }

  1836. 

  1837.     *last = lst;

  1838.     *skip = run;

  1839.     *value = level;

  1840. }

  1841. 

  1842. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1843.  * @param v VC1Context

  1844.  * @param block block to decode

  1845.  * @param coded are AC coeffs present or not

  1846.  * @param codingset set of VLC to decode data

  1847.  */

  1848. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1849. {

  1850.     GetBitContext *gb = &v->s.gb;

  1851.     MpegEncContext *s = &v->s;

  1852.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1853.     int run_diff, i;

  1854.     int16_t *dc_val;

  1855.     int16_t *ac_val, *ac_val2;

  1856.     int dcdiff;

  1857. 

  1858.     /* Get DC differential */

  1859.     if (n < 4) {

  1860.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1861.     } else {

  1862.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1863.     }

  1864.     if (dcdiff < 0){

  1865.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1866.         return -1;

  1867.     }

  1868.     if (dcdiff)

  1869.     {

  1870.         if (dcdiff == 119 /* ESC index value */)

  1871.         {

  1872.             /* TODO: Optimize */

  1873.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1874.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1875.             else dcdiff = get_bits(gb, 8);

  1876.         }

  1877.         else

  1878.         {

  1879.             if (v->pq == 1)

  1880.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1881.             else if (v->pq == 2)

  1882.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1883.         }

  1884.         if (get_bits(gb, 1))

  1885.             dcdiff = -dcdiff;

  1886.     }

  1887. 

  1888.     /* Prediction */

  1889.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1890.     *dc_val = dcdiff;

  1891. 

  1892.     /* Store the quantized DC coeff, used for prediction */

  1893.     if (n < 4) {

  1894.         block[0] = dcdiff * s->y_dc_scale;

  1895.     } else {

  1896.         block[0] = dcdiff * s->c_dc_scale;

  1897.     }

  1898.     /* Skip ? */

  1899.     run_diff = 0;

  1900.     i = 0;

  1901.     if (!coded) {

  1902.         goto not_coded;

  1903.     }

  1904. 

  1905.     //AC Decoding

  1906.     i = 1;

  1907. 

  1908.     {

  1909.         int last = 0, skip, value;

  1910.         const int8_t *zz_table;

  1911.         int scale;

  1912.         int k;

  1913. 

  1914.         scale = v->pq * 2 + v->halfpq;

  1915. 

  1916.         if(v->s.ac_pred) {

  1917.             if(!dc_pred_dir)

  1918.                 zz_table = vc1_horizontal_zz;

  1919.             else

  1920.                 zz_table = vc1_vertical_zz;

  1921.         } else

  1922.             zz_table = vc1_normal_zz;

  1923. 

  1924.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1925.         ac_val2 = ac_val;

  1926.         if(dc_pred_dir) //left

  1927.             ac_val -= 16;

  1928.         else //top

  1929.             ac_val -= 16 * s->block_wrap[n];

  1930. 

  1931.         while (!last) {

  1932.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1933.             i += skip;

  1934.             if(i > 63)

  1935.                 break;

  1936.             block[zz_table[i++]] = value;

  1937.         }

  1938. 

  1939.         /* apply AC prediction if needed */

  1940.         if(s->ac_pred) {

  1941.             if(dc_pred_dir) { //left

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

  1943.                     block[k << 3] += ac_val[k];

  1944.             } else { //top

  1945.                 for(k = 1; k < 8; k++)

  1946.                     block[k] += ac_val[k + 8];

  1947.             }

  1948.         }

  1949.         /* save AC coeffs for further prediction */

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

  1951.             ac_val2[k] = block[k << 3];

  1952.             ac_val2[k + 8] = block[k];

  1953.         }

  1954. 

  1955.         /* scale AC coeffs */

  1956.         for(k = 1; k < 64; k++)

  1957.             if(block[k]) {

  1958.                 block[k] *= scale;

  1959.                 if(!v->pquantizer)

  1960.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  1961.             }

  1962. 

  1963.         if(s->ac_pred) i = 63;

  1964.     }

  1965. 

  1966. not_coded:

  1967.     if(!coded) {

  1968.         int k, scale;

  1969.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1970.         ac_val2 = ac_val;

  1971. 

  1972.         scale = v->pq * 2 + v->halfpq;

  1973.         memset(ac_val2, 0, 16 * 2);

  1974.         if(dc_pred_dir) {//left

  1975.             ac_val -= 16;

  1976.             if(s->ac_pred)

  1977.                 memcpy(ac_val2, ac_val, 8 * 2);

  1978.         } else {//top

  1979.             ac_val -= 16 * s->block_wrap[n];

  1980.             if(s->ac_pred)

  1981.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1982.         }

  1983. 

  1984.         /* apply AC prediction if needed */

  1985.         if(s->ac_pred) {

  1986.             if(dc_pred_dir) { //left

  1987.                 for(k = 1; k < 8; k++) {

  1988.                     block[k << 3] = ac_val[k] * scale;

  1989.                     if(!v->pquantizer)

  1990.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  1991.                 }

  1992.             } else { //top

  1993.                 for(k = 1; k < 8; k++) {

  1994.                     block[k] = ac_val[k + 8] * scale;

  1995.                     if(!v->pquantizer)

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

  1997.                 }

  1998.             }

  1999.             i = 63;

  2000.         }

  2001.     }

  2002.     s->block_last_index[n] = i;

  2003. 

  2004.     return 0;

  2005. }

  2006. 

  2007. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2008.  * @param v VC1Context

  2009.  * @param block block to decode

  2010.  * @param coded are AC coeffs present or not

  2011.  * @param mquant block quantizer

  2012.  * @param codingset set of VLC to decode data

  2013.  */

  2014. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2015. {

  2016.     GetBitContext *gb = &v->s.gb;

  2017.     MpegEncContext *s = &v->s;

  2018.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2019.     int run_diff, i;

  2020.     int16_t *dc_val;

  2021.     int16_t *ac_val, *ac_val2;

  2022.     int dcdiff;

  2023.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2024.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2025.     int use_pred = s->ac_pred;

  2026.     int scale;

  2027. 

  2028.     /* XXX: Guard against dumb values of mquant */

  2029.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2030. 

  2031.     /* Set DC scale - y and c use the same */

  2032.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2033.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2034. 

  2035.     /* Get DC differential */

  2036.     if (n < 4) {

  2037.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2038.     } else {

  2039.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2040.     }

  2041.     if (dcdiff < 0){

  2042.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2043.         return -1;

  2044.     }

  2045.     if (dcdiff)

  2046.     {

  2047.         if (dcdiff == 119 /* ESC index value */)

  2048.         {

  2049.             /* TODO: Optimize */

  2050.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2051.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2052.             else dcdiff = get_bits(gb, 8);

  2053.         }

  2054.         else

  2055.         {

  2056.             if (mquant == 1)

  2057.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2058.             else if (mquant == 2)

  2059.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2060.         }

  2061.         if (get_bits(gb, 1))

  2062.             dcdiff = -dcdiff;

  2063.     }

  2064. 

  2065.     /* Prediction */

  2066.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2067.     *dc_val = dcdiff;

  2068. 

  2069.     /* Store the quantized DC coeff, used for prediction */

  2070. 

  2071.     if (n < 4) {

  2072.         block[0] = dcdiff * s->y_dc_scale;

  2073.     } else {

  2074.         block[0] = dcdiff * s->c_dc_scale;

  2075.     }

  2076.     /* Skip ? */

  2077.     run_diff = 0;

  2078.     i = 0;

  2079. 

  2080.     //AC Decoding

  2081.     i = 1;

  2082. 

  2083.     /* check if AC is needed at all and adjust direction if needed */

  2084.     if(!a_avail) dc_pred_dir = 1;

  2085.     if(!c_avail) dc_pred_dir = 0;

  2086.     if(!a_avail && !c_avail) use_pred = 0;

  2087.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2088.     ac_val2 = ac_val;

  2089. 

  2090.     scale = mquant * 2;

  2091. 

  2092.     if(dc_pred_dir) //left

  2093.         ac_val -= 16;

  2094.     else //top

  2095.         ac_val -= 16 * s->block_wrap[n];

  2096. 

  2097.     if(coded) {

  2098.         int last = 0, skip, value;

  2099.         const int8_t *zz_table;

  2100.         int k;

  2101. 

  2102.         zz_table = vc1_simple_progressive_8x8_zz;

  2103. 

  2104.         while (!last) {

  2105.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2106.             i += skip;

  2107.             if(i > 63)

  2108.                 break;

  2109.             block[zz_table[i++]] = value;

  2110.         }

  2111. 

  2112.         /* apply AC prediction if needed */

  2113.         if(use_pred) {

  2114.             /* scale predictors if needed*/

  2115.             int mb_pos2, q1, q2;

  2116. 

  2117.             mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  2118.             q1 = s->current_picture.qscale_table[mb_pos];

  2119.             q2 = s->current_picture.qscale_table[mb_pos2];

  2120. 

  2121.             if(0 && q2 && q1!=q2 && ((dc_pred_dir && c_avail) || (!dc_pred_dir && a_avail))) {

  2122.                 q1 = q1 * 2 - 1;

  2123.                 q2 = q2 * 2 - 1;

  2124. 

  2125.                 if(dc_pred_dir) { //left

  2126.                     for(k = 1; k < 8; k++)

  2127.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2128.                 } else { //top

  2129.                     for(k = 1; k < 8; k++)

  2130.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2131.                 }

  2132.             } else {

  2133.                 if(dc_pred_dir) { //left

  2134.                     for(k = 1; k < 8; k++)

  2135.                         block[k << 3] += ac_val[k];

  2136.                 } else { //top

  2137.                     for(k = 1; k < 8; k++)

  2138.                         block[k] += ac_val[k + 8];

  2139.                 }

  2140.             }

  2141.         }

  2142.         /* save AC coeffs for further prediction */

  2143.         for(k = 1; k < 8; k++) {

  2144.             ac_val2[k] = block[k << 3];

  2145.             ac_val2[k + 8] = block[k];

  2146.         }

  2147. 

  2148.         /* scale AC coeffs */

  2149.         for(k = 1; k < 64; k++)

  2150.             if(block[k]) {

  2151.                 block[k] *= scale;

  2152.                 if(!v->pquantizer)

  2153.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2154.             }

  2155. 

  2156.         if(use_pred) i = 63;

  2157.     } else { // no AC coeffs

  2158.         int k;

  2159.         int mb_pos2, q1, q2;

  2160. 

  2161.         mb_pos2 = mb_pos - dc_pred_dir - (1 - dc_pred_dir) * s->mb_stride;

  2162.         q1 = s->current_picture.qscale_table[mb_pos];

  2163.         q2 = s->current_picture.qscale_table[mb_pos2];

  2164. 

  2165.         memset(ac_val2, 0, 16 * 2);

  2166.         if(dc_pred_dir) {//left

  2167.             if(use_pred) {

  2168.                 memcpy(ac_val2, ac_val, 8 * 2);

  2169.                 if(0 && q2 && q1!=q2 && c_avail) {

  2170.                     q1 = q1 * 2 - 1;

  2171.                     q2 = q2 * 2 - 1;

  2172.                     for(k = 1; k < 8; k++)

  2173.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2174.                 }

  2175.             }

  2176.         } else {//top

  2177.             if(use_pred) {

  2178.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2179.                 if(0 && q2 && q1!=q2 && a_avail) {

  2180.                     q1 = q1 * 2 - 1;

  2181.                     q2 = q2 * 2 - 1;

  2182.                     for(k = 1; k < 8; k++)

  2183.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2184.                 }

  2185.             }

  2186.         }

  2187. 

  2188.         /* apply AC prediction if needed */

  2189.         if(use_pred) {

  2190.             if(dc_pred_dir) { //left

  2191.                 for(k = 1; k < 8; k++) {

  2192.                     block[k << 3] = ac_val2[k] * scale;

  2193.                     if(!v->pquantizer)

  2194.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2195.                 }

  2196.             } else { //top

  2197.                 for(k = 1; k < 8; k++) {

  2198.                     block[k] = ac_val2[k + 8] * scale;

  2199.                     if(!v->pquantizer)

  2200.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2201.                 }

  2202.             }

  2203.             i = 63;

  2204.         }

  2205.     }

  2206.     s->block_last_index[n] = i;

  2207. 

  2208.     return 0;

  2209. }

  2210. 

  2211. /** Decode P block

  2212.  */

  2213. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2214. {

  2215.     MpegEncContext *s = &v->s;

  2216.     GetBitContext *gb = &s->gb;

  2217.     int i, j;

  2218.     int subblkpat = 0;

  2219.     int scale, off, idx, last, skip, value;

  2220.     int ttblk = ttmb & 7;

  2221. 

  2222.     if(ttmb == -1) {

  2223.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2224.     }

  2225.     if(ttblk == TT_4X4) {

  2226.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2227.     }

  2228.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2229.         subblkpat = decode012(gb);

  2230.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2231.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2232.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2233.     }

  2234.     scale = 2 * mquant;

  2235. 

  2236.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2237.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2238.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2239.         ttblk = TT_8X4;

  2240.     }

  2241.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2242.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2243.         ttblk = TT_4X8;

  2244.     }

  2245.     switch(ttblk) {

  2246.     case TT_8X8:

  2247.         i = 0;

  2248.         last = 0;

  2249.         while (!last) {

  2250.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2251.             i += skip;

  2252.             if(i > 63)

  2253.                 break;

  2254.             idx = vc1_simple_progressive_8x8_zz[i++];

  2255.             block[idx] = value * scale;

  2256.         }

  2257.         vc1_inv_trans(block, 8, 8);

  2258.         break;

  2259.     case TT_4X4:

  2260.         for(j = 0; j < 4; j++) {

  2261.             last = subblkpat & (1 << (3 - j));

  2262.             i = 0;

  2263.             off = (j & 1) * 4 + (j & 2) * 16;

  2264.             while (!last) {

  2265.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2266.                 i += skip;

  2267.                 if(i > 15)

  2268.                     break;

  2269.                 idx = vc1_simple_progressive_4x4_zz[i++];

  2270.                 block[idx + off] = value * scale;

  2271.             }

  2272.             if(!(subblkpat & (1 << (3 - j))))

  2273.                 vc1_inv_trans(block + off, 4, 4);

  2274.         }

  2275.         break;

  2276.     case TT_8X4:

  2277.         for(j = 0; j < 2; j++) {

  2278.             last = subblkpat & (1 << (1 - j));

  2279.             i = 0;

  2280.             off = j * 32;

  2281.             while (!last) {

  2282.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2283.                 i += skip;

  2284.                 if(i > 31)

  2285.                     break;

  2286.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2287.                 block[idx + off] = value * scale;

  2288.             }

  2289.             if(!(subblkpat & (1 << (1 - j))))

  2290.                 vc1_inv_trans(block + off, 8, 4);

  2291.         }

  2292.         break;

  2293.     case TT_4X8:

  2294.         for(j = 0; j < 2; j++) {

  2295.             last = subblkpat & (1 << (1 - j));

  2296.             i = 0;

  2297.             off = j * 4;

  2298.             while (!last) {

  2299.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2300.                 i += skip;

  2301.                 if(i > 31)

  2302.                     break;

  2303.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2304.                 block[idx + off] = value * scale;

  2305.             }

  2306.             if(!(subblkpat & (1 << (1 - j))))

  2307.                 vc1_inv_trans(block + off, 4, 8);

  2308.         }

  2309.         break;

  2310.     }

  2311.     return 0;

  2312. }

  2313. 

  2314. 

  2315. /** Decode one P-frame MB (in Simple/Main profile)

  2316.  * @todo TODO: Extend to AP

  2317.  * @fixme FIXME: DC value for inter blocks not set

  2318.  */

  2319. static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])

  2320. {

  2321.     MpegEncContext *s = &v->s;

  2322.     GetBitContext *gb = &s->gb;

  2323.     int i, j;

  2324.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2325.     int cbp; /* cbp decoding stuff */

  2326.     int mqdiff, mquant; /* MB quantization */

  2327.     int ttmb = v->ttfrm; /* MB Transform type */

  2328.     int status;

  2329. 

  2330.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2331.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2332.     int mb_has_coeffs = 1; /* last_flag */

  2333.     int dmv_x, dmv_y; /* Differential MV components */

  2334.     int index, index1; /* LUT indices */

  2335.     int val, sign; /* temp values */

  2336.     int first_block = 1;

  2337.     int dst_idx, off;

  2338.     int skipped, fourmv;

  2339. 

  2340.     mquant = v->pq; /* Loosy initialization */

  2341. 

  2342.     if (v->mv_type_is_raw)

  2343.         fourmv = get_bits1(gb);

  2344.     else

  2345.         fourmv = v->mv_type_mb_plane[mb_pos];

  2346.     if (v->skip_is_raw)

  2347.         skipped = get_bits1(gb);

  2348.     else

  2349.         skipped = v->s.mbskip_table[mb_pos];

  2350. 

  2351.     s->dsp.clear_blocks(s->block[0]);

  2352. 

  2353.     if (!fourmv) /* 1MV mode */

  2354.     {

  2355.         if (!skipped)

  2356.         {

  2357.             GET_MVDATA(dmv_x, dmv_y);

  2358. 

  2359.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2360.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  2361. 

  2362.             /* FIXME Set DC val for inter block ? */

  2363.             if (s->mb_intra && !mb_has_coeffs)

  2364.             {

  2365.                 GET_MQUANT();

  2366.                 s->ac_pred = get_bits(gb, 1);

  2367.                 cbp = 0;

  2368.             }

  2369.             else if (mb_has_coeffs)

  2370.             {

  2371.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2372.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2373.                 GET_MQUANT();

  2374.             }

  2375.             else

  2376.             {

  2377.                 mquant = v->pq;

  2378.                 cbp = 0;

  2379.             }

  2380.             s->current_picture.qscale_table[mb_pos] = mquant;

  2381. 

  2382.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2383.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2384.                                 VC1_TTMB_VLC_BITS, 2);

  2385.             if(!s->mb_intra) vc1_mc_1mv(v);

  2386.             dst_idx = 0;

  2387.             for (i=0; i<6; i++)

  2388.             {

  2389.                 s->dc_val[0][s->block_index[i]] = 0;

  2390.                 dst_idx += i >> 2;

  2391.                 val = ((cbp >> (5 - i)) & 1);

  2392.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2393.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2394.                 if(s->mb_intra) {

  2395.                     /* check if prediction blocks A and C are available */

  2396.                     v->a_avail = v->c_avail = 0;

  2397.                     if(i == 2 || i == 3 || s->mb_y)

  2398.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2399.                     if(i == 1 || i == 3 || s->mb_x)

  2400.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2401. 

  2402.                     vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2403.                     vc1_inv_trans(block[i], 8, 8);

  2404.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2405.                     s->dsp.put_pixels_clamped(block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2406.                     /* TODO: proper loop filtering */

  2407.                     if(v->pq >= 9 && v->overlap) {

  2408.                         if(v->a_avail)

  2409.                             s->dsp.h263_v_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2410.                         if(v->c_avail)

  2411.                             s->dsp.h263_h_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2412.                     }

  2413.                 } else if(val) {

  2414.                     vc1_decode_p_block(v, block[i], i, mquant, ttmb, first_block);

  2415.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2416.                     first_block = 0;

  2417.                     s->dsp.add_pixels_clamped(block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2418.                 }

  2419.             }

  2420.         }

  2421.         else //Skipped

  2422.         {

  2423.             s->mb_intra = 0;

  2424.             for(i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2425.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2426.             s->current_picture.qscale_table[mb_pos] = 0;

  2427.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  2428.             vc1_mc_1mv(v);

  2429.             return 0;

  2430.         }

  2431.     } //1MV mode

  2432.     else //4MV mode

  2433.     {

  2434.         if (!skipped /* unskipped MB */)

  2435.         {

  2436.             int intra_count = 0, coded_inter = 0;

  2437.             int is_intra[6], is_coded[6];

  2438.             /* Get CBPCY */

  2439.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2440.             for (i=0; i<6; i++)

  2441.             {

  2442.                 val = ((cbp >> (5 - i)) & 1);

  2443.                 s->dc_val[0][s->block_index[i]] = 0;

  2444.                 s->mb_intra = 0;

  2445.                 if(i < 4) {

  2446.                     dmv_x = dmv_y = 0;

  2447.                     s->mb_intra = 0;

  2448.                     mb_has_coeffs = 0;

  2449.                     if(val) {

  2450.                         GET_MVDATA(dmv_x, dmv_y);

  2451.                     }

  2452.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  2453.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  2454.                     intra_count += s->mb_intra;

  2455.                     is_intra[i] = s->mb_intra;

  2456.                     is_coded[i] = mb_has_coeffs;

  2457.                 }

  2458.                 if(i&4){

  2459.                     is_intra[i] = (intra_count >= 3);

  2460.                     is_coded[i] = val;

  2461.                 }

  2462.                 if(i == 4) vc1_mc_4mv_chroma(v);

  2463.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  2464.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  2465.             }

  2466.             dst_idx = 0;

  2467.             GET_MQUANT();

  2468.             s->current_picture.qscale_table[mb_pos] = mquant;

  2469.             /* test if block is intra and has pred */

  2470.             {

  2471.                 int intrapred = 0;

  2472.                 for(i=0; i<6; i++)

  2473.                     if(is_intra[i]) {

  2474.                         if(v->mb_type[0][s->block_index[i] - s->block_wrap[i]] || v->mb_type[0][s->block_index[i] - 1]) {

  2475.                             intrapred = 1;

  2476.                             break;

  2477.                         }

  2478.                     }

  2479.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  2480.                 else s->ac_pred = 0;

  2481.             }

  2482.             if (!v->ttmbf && coded_inter)

  2483.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 12);

  2484.             for (i=0; i<6; i++)

  2485.             {

  2486.                 dst_idx += i >> 2;

  2487.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2488.                 s->mb_intra = is_intra[i];

  2489.                 if (is_intra[i]) {

  2490.                     /* check if prediction blocks A and C are available */

  2491.                     v->a_avail = v->c_avail = 0;

  2492.                     if(i == 2 || i == 3 || s->mb_y)

  2493.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2494.                     if(i == 1 || i == 3 || s->mb_x)

  2495.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2496. 

  2497.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  2498.                     vc1_inv_trans(block[i], 8, 8);

  2499.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2500.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2501.                     /* TODO: proper loop filtering */

  2502.                     if(v->pq >= 9 && v->overlap) {

  2503.                         if(v->a_avail)

  2504.                             s->dsp.h263_v_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2505.                         if(v->c_avail)

  2506.                             s->dsp.h263_h_loop_filter(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2), s->y_dc_scale);

  2507.                     }

  2508.                 } else if(is_coded[i]) {

  2509.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2510.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2511.                     first_block = 0;

  2512.                     s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2513.                 }

  2514.             }

  2515.             return status;

  2516.         }

  2517.         else //Skipped MB

  2518.         {

  2519.             s->mb_intra = 0;

  2520.             for (i=0; i<6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2521.             for (i=0; i<4; i++)

  2522.             {

  2523.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  2524.                 vc1_mc_4mv_luma(v, i);

  2525.             }

  2526.             vc1_mc_4mv_chroma(v);

  2527.             s->current_picture.qscale_table[mb_pos] = 0;

  2528.             return 0;

  2529.         }

  2530.     }

  2531. 

  2532.     /* Should never happen */

  2533.     return -1;

  2534. }

  2535. 

  2536. /** Decode blocks of I-frame

  2537.  */

  2538. static void vc1_decode_i_blocks(VC1Context *v)

  2539. {

  2540.     int k;

  2541.     MpegEncContext *s = &v->s;

  2542.     int cbp, val;

  2543.     uint8_t *coded_val;

  2544.     int mb_pos;

  2545. 

  2546.     /* select codingmode used for VLC tables selection */

  2547.     switch(v->y_ac_table_index){

  2548.     case 0:

  2549.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2550.         break;

  2551.     case 1:

  2552.         v->codingset = CS_HIGH_MOT_INTRA;

  2553.         break;

  2554.     case 2:

  2555.         v->codingset = CS_MID_RATE_INTRA;

  2556.         break;

  2557.     }

  2558. 

  2559.     switch(v->c_ac_table_index){

  2560.     case 0:

  2561.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2562.         break;

  2563.     case 1:

  2564.         v->codingset2 = CS_HIGH_MOT_INTER;

  2565.         break;

  2566.     case 2:

  2567.         v->codingset2 = CS_MID_RATE_INTER;

  2568.         break;

  2569.     }

  2570. 

  2571.     /* Set DC scale - y and c use the same */

  2572.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2573.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2574. 

  2575.     //do frame decode

  2576.     s->mb_x = s->mb_y = 0;

  2577.     s->mb_intra = 1;

  2578.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2579.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2580.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2581.             ff_init_block_index(s);

  2582.             ff_update_block_index(s);

  2583.             s->dsp.clear_blocks(s->block[0]);

  2584.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2585.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2586.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2587. 

  2588.             // do actual MB decoding and displaying

  2589.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

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

  2591. 

  2592.             for(k = 0; k < 6; k++) {

  2593.                 val = ((cbp >> (5 - k)) & 1);

  2594. 

  2595.                 if (k < 4) {

  2596.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2597.                     val = val ^ pred;

  2598.                     *coded_val = val;

  2599.                 }

  2600.                 cbp |= val << (5 - k);

  2601. 

  2602.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2603. 

  2604.                 vc1_inv_trans(s->block[k], 8, 8);

  2605.                 if(v->pq >= 9 && v->overlap) {

  2606.                     vc1_overlap_block(s, s->block[k], k, (s->mb_y || k>1), (s->mb_x || (k != 0 && k != 2)));

  2607.                 }

  2608.             }

  2609. 

  2610.             vc1_put_block(v, s->block);

  2611.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2612.                 if(s->mb_y) {

  2613.                     s->dsp.h263_v_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2614.                     s->dsp.h263_v_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2615.                     s->dsp.h263_v_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2616.                     s->dsp.h263_v_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2617.                 }

  2618.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2619.                 s->dsp.h263_v_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2620.                 if(s->mb_x) {

  2621.                     s->dsp.h263_h_loop_filter(s->dest[0], s->linesize, s->y_dc_scale);

  2622.                     s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize, s->linesize, s->y_dc_scale);

  2623.                     s->dsp.h263_h_loop_filter(s->dest[1], s->uvlinesize, s->y_dc_scale);

  2624.                     s->dsp.h263_h_loop_filter(s->dest[2], s->uvlinesize, s->y_dc_scale);

  2625.                 }

  2626.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8, s->linesize, s->y_dc_scale);

  2627.                 s->dsp.h263_h_loop_filter(s->dest[0] + 8 * s->linesize + 8, s->linesize, s->y_dc_scale);

  2628.             }

  2629. 

  2630.             if(get_bits_count(&s->gb) > v->bits) {

  2631.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2632.                 return;

  2633.             }

  2634.         }

  2635.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2636.     }

  2637. }

  2638. 

  2639. static void vc1_decode_p_blocks(VC1Context *v)

  2640. {

  2641.     MpegEncContext *s = &v->s;

  2642. 

  2643.     /* select codingmode used for VLC tables selection */

  2644.     switch(v->c_ac_table_index){

  2645.     case 0:

  2646.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2647.         break;

  2648.     case 1:

  2649.         v->codingset = CS_HIGH_MOT_INTRA;

  2650.         break;

  2651.     case 2:

  2652.         v->codingset = CS_MID_RATE_INTRA;

  2653.         break;

  2654.     }

  2655. 

  2656.     switch(v->c_ac_table_index){

  2657.     case 0:

  2658.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2659.         break;

  2660.     case 1:

  2661.         v->codingset2 = CS_HIGH_MOT_INTER;

  2662.         break;

  2663.     case 2:

  2664.         v->codingset2 = CS_MID_RATE_INTER;

  2665.         break;

  2666.     }

  2667. 

  2668.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2669.     s->first_slice_line = 1;

  2670.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2671.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2672.             ff_init_block_index(s);

  2673.             ff_update_block_index(s);

  2674.             s->dsp.clear_blocks(s->block[0]);

  2675. 

  2676.             vc1_decode_p_mb(v, s->block);

  2677.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2678.                 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);

  2679.                 return;

  2680.             }

  2681.         }

  2682.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2683.         s->first_slice_line = 0;

  2684.     }

  2685. }

  2686. 

  2687. static void vc1_decode_blocks(VC1Context *v)

  2688. {

  2689. 

  2690.     v->s.esc3_level_length = 0;

  2691. 

  2692.     switch(v->s.pict_type) {

  2693.     case I_TYPE:

  2694.         vc1_decode_i_blocks(v);

  2695.         break;

  2696.     case P_TYPE:

  2697.         vc1_decode_p_blocks(v);

  2698.         break;

  2699.     }

  2700. }

  2701. 

  2702. 

  2703. /** Initialize a VC1/WMV3 decoder

  2704.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2705.  * @todo TODO: Decypher remaining bits in extra_data

  2706.  */

  2707. static int vc1_decode_init(AVCodecContext *avctx)

  2708. {

  2709.     VC1Context *v = avctx->priv_data;

  2710.     MpegEncContext *s = &v->s;

  2711.     GetBitContext gb;

  2712. 

  2713.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  2714.     avctx->pix_fmt = PIX_FMT_YUV420P;

  2715.     v->s.avctx = avctx;

  2716.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  2717.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  2718. 

  2719.     if(ff_h263_decode_init(avctx) < 0)

  2720.         return -1;

  2721.     if (vc1_init_common(v) < 0) return -1;

  2722. 

  2723.     av_log(avctx, AV_LOG_INFO, "This decoder is not supposed to produce picture. Dont report this as a bug!\n");

  2724.     av_log(avctx, AV_LOG_INFO, "If you see a picture, don't believe your eyes.\n");

  2725. 

  2726.     avctx->coded_width = avctx->width;

  2727.     avctx->coded_height = avctx->height;

  2728.     if (avctx->codec_id == CODEC_ID_WMV3)

  2729.     {

  2730.         int count = 0;

  2731. 

  2732.         // looks like WMV3 has a sequence header stored in the extradata

  2733.         // advanced sequence header may be before the first frame

  2734.         // the last byte of the extradata is a version number, 1 for the

  2735.         // samples we can decode

  2736. 

  2737.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  2738. 

  2739.         if (decode_sequence_header(avctx, &gb) < 0)

  2740.           return -1;

  2741. 

  2742.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  2743.         if (count>0)

  2744.         {

  2745.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  2746.                    count, get_bits(&gb, count));

  2747.         }

  2748.         else if (count < 0)

  2749.         {

  2750.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  2751.         }

  2752.     }

  2753.     avctx->has_b_frames= !!(avctx->max_b_frames);

  2754. 

  2755.     s->mb_width = (avctx->coded_width+15)>>4;

  2756.     s->mb_height = (avctx->coded_height+15)>>4;

  2757. 

  2758.     /* Allocate mb bitplanes */

  2759.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  2760. 

  2761.     /* allocate block type info in that way so it could be used with s->block_index[] */

  2762.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  2763.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  2764.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  2765.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  2766. 

  2767.     /* Init coded blocks info */

  2768.     if (v->profile == PROFILE_ADVANCED)

  2769.     {

  2770. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  2771. //            return -1;

  2772. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  2773. //            return -1;

  2774.     }

  2775. 

  2776.     return 0;

  2777. }

  2778. 

  2779. 

  2780. /** Decode a VC1/WMV3 frame

  2781.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2782.  * @warning Initial try at using MpegEncContext stuff

  2783.  */

  2784. static int vc1_decode_frame(AVCodecContext *avctx,

  2785.                             void *data, int *data_size,

  2786.                             uint8_t *buf, int buf_size)

  2787. {

  2788.     VC1Context *v = avctx->priv_data;

  2789.     MpegEncContext *s = &v->s;

  2790.     AVFrame *pict = data;

  2791. 

  2792.     /* no supplementary picture */

  2793.     if (buf_size == 0) {

  2794.         /* special case for last picture */

  2795.         if (s->low_delay==0 && s->next_picture_ptr) {

  2796.             *pict= *(AVFrame*)s->next_picture_ptr;

  2797.             s->next_picture_ptr= NULL;

  2798. 

  2799.             *data_size = sizeof(AVFrame);

  2800.         }

  2801. 

  2802.         return 0;

  2803.     }

  2804. 

  2805.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  2806.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  2807.         int i= ff_find_unused_picture(s, 0);

  2808.         s->current_picture_ptr= &s->picture[i];

  2809.     }

  2810. 

  2811.     avctx->has_b_frames= !s->low_delay;

  2812. 

  2813.     init_get_bits(&s->gb, buf, buf_size*8);

  2814.     // do parse frame header

  2815.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  2816.         return -1;

  2817. 

  2818.     if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;

  2819. 

  2820.     // for hurry_up==5

  2821.     s->current_picture.pict_type= s->pict_type;

  2822.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  2823. 

  2824.     /* skip B-frames if we don't have reference frames */

  2825.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  2826.     /* skip b frames if we are in a hurry */

  2827.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  2828.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  2829.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  2830.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  2831.         return buf_size;

  2832.     /* skip everything if we are in a hurry>=5 */

  2833.     if(avctx->hurry_up>=5) return -1;//buf_size;

  2834. 

  2835.     if(s->next_p_frame_damaged){

  2836.         if(s->pict_type==B_TYPE)

  2837.             return buf_size;

  2838.         else

  2839.             s->next_p_frame_damaged=0;

  2840.     }

  2841. 

  2842.     if(MPV_frame_start(s, avctx) < 0)

  2843.         return -1;

  2844. 

  2845.     ff_er_frame_start(s);

  2846. 

  2847.     v->bits = buf_size * 8;

  2848.     vc1_decode_blocks(v);

  2849. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  2850. //  if(get_bits_count(&s->gb) > buf_size * 8)

  2851. //      return -1;

  2852.     ff_er_frame_end(s);

  2853. 

  2854.     MPV_frame_end(s);

  2855. 

  2856. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  2857. assert(s->current_picture.pict_type == s->pict_type);

  2858.     if (s->pict_type == B_TYPE || s->low_delay) {

  2859.         *pict= *(AVFrame*)s->current_picture_ptr;

  2860.     } else if (s->last_picture_ptr != NULL) {

  2861.         *pict= *(AVFrame*)s->last_picture_ptr;

  2862.     }

  2863. 

  2864.     if(s->last_picture_ptr || s->low_delay){

  2865.         *data_size = sizeof(AVFrame);

  2866.         ff_print_debug_info(s, pict);

  2867.     }

  2868. 

  2869.     /* Return the Picture timestamp as the frame number */

  2870.     /* we substract 1 because it is added on utils.c    */

  2871.     avctx->frame_number = s->picture_number - 1;

  2872. 

  2873.     return buf_size;

  2874. }

  2875. 

  2876. 

  2877. /** Close a VC1/WMV3 decoder

  2878.  * @warning Initial try at using MpegEncContext stuff

  2879.  */

  2880. static int vc1_decode_end(AVCodecContext *avctx)

  2881. {

  2882.     VC1Context *v = avctx->priv_data;

  2883. 

  2884.     av_freep(&v->hrd_rate);

  2885.     av_freep(&v->hrd_buffer);

  2886.     MPV_common_end(&v->s);

  2887.     av_freep(&v->mv_type_mb_plane);

  2888.     av_freep(&v->mb_type_base);

  2889.     return 0;

  2890. }

  2891. 

  2892. 

  2893. AVCodec vc1_decoder = {

  2894.     "vc1",

  2895.     CODEC_TYPE_VIDEO,

  2896.     CODEC_ID_VC1,

  2897.     sizeof(VC1Context),

  2898.     vc1_decode_init,

  2899.     NULL,

  2900.     vc1_decode_end,

  2901.     vc1_decode_frame,

  2902.     CODEC_CAP_DELAY,

  2903.     NULL

  2904. };

  2905. 

  2906. AVCodec wmv3_decoder = {

  2907.     "wmv3",

  2908.     CODEC_TYPE_VIDEO,

  2909.     CODEC_ID_WMV3,

  2910.     sizeof(VC1Context),

  2911.     vc1_decode_init,

  2912.     NULL,

  2913.     vc1_decode_end,

  2914.     vc1_decode_frame,

  2915.     CODEC_CAP_DELAY,

  2916.     NULL

  2917. };