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

  323. 

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

  325.     //@{

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

  327.     uint8_t interpfrm;

  328.     //@}

  329. 

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

  331.     //@{

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

  333.     uint8_t numpanscanwin;

  334.     uint8_t tfcntr;

  335.     uint8_t rptfrm, tff, rff;

  336.     uint16_t topleftx;

  337.     uint16_t toplefty;

  338.     uint16_t bottomrightx;

  339.     uint16_t bottomrighty;

  340.     uint8_t uvsamp;

  341.     uint8_t postproc;

  342.     int hrd_num_leaky_buckets;

  343.     uint8_t bit_rate_exponent;

  344.     uint8_t buffer_size_exponent;

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

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

  347.     uint8_t condover;

  348.     uint16_t *hrd_rate, *hrd_buffer;

  349.     uint8_t *hrd_fullness;

  350.     uint8_t range_mapy_flag;

  351.     uint8_t range_mapuv_flag;

  352.     uint8_t range_mapy;

  353.     uint8_t range_mapuv;

  354.     //@}

  355. } VC1Context;

  356. 

  357. /**

  358.  * Get unary code of limited length

  359.  * @fixme FIXME Slow and ugly

  360.  * @param gb GetBitContext

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

  362.  * @param[in] len Maximum length

  363.  * @return Unary length/index

  364.  */

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

  366. {

  367. #if 1

  368.     int i;

  369. 

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

  371.     return i;

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

  373. 

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

  375.   {

  376.     tmp = get_bits(gb, 1);

  377.     i++;

  378.   }

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

  380.   return i;*/

  381. #else

  382.   unsigned int buf;

  383.   int log;

  384. 

  385.   OPEN_READER(re, gb);

  386.   UPDATE_CACHE(re, gb);

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

  388.   if (stop) buf = ~buf;

  389. 

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

  391.   if (log < limit){

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

  393.     CLOSE_READER(re, gb);

  394.     return log;

  395.   }

  396. 

  397.   LAST_SKIP_BITS(re, gb, limit);

  398.   CLOSE_READER(re, gb);

  399.   return limit;

  400. #endif

  401. }

  402. 

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

  404.     int n;

  405.     n = get_bits1(gb);

  406.     if (n == 1)

  407.         return 0;

  408.     else

  409.         return 2 - get_bits1(gb);

  410. }

  411. 

  412. /**

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

  414.  * @param v The VC1Context to initialize

  415.  * @return Status

  416.  */

  417. static int vc1_init_common(VC1Context *v)

  418. {

  419.     static int done = 0;

  420.     int i = 0;

  421. 

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

  423. 

  424.     /* VLC tables */

  425.     if(!done)

  426.     {

  427.         done = 1;

  428.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  429.                  vc1_bfraction_bits, 1, 1,

  430.                  vc1_bfraction_codes, 1, 1, 1);

  431.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  432.                  vc1_norm2_bits, 1, 1,

  433.                  vc1_norm2_codes, 1, 1, 1);

  434.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  435.                  vc1_norm6_bits, 1, 1,

  436.                  vc1_norm6_codes, 2, 2, 1);

  437.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  438.                  vc1_imode_bits, 1, 1,

  439.                  vc1_imode_codes, 1, 1, 1);

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

  441.         {

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

  443.                      vc1_ttmb_bits[i], 1, 1,

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

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

  446.                      vc1_ttblk_bits[i], 1, 1,

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

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

  449.                      vc1_subblkpat_bits[i], 1, 1,

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

  451.         }

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

  453.         {

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

  455.                      vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  458.                      vc1_cbpcy_p_bits[i], 1, 1,

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

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

  461.                      vc1_mv_diff_bits[i], 1, 1,

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

  463.         }

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

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

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

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

  468.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  471.     }

  472. 

  473.     /* Other defaults */

  474.     v->pq = -1;

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

  476. 

  477.     return 0;

  478. }

  479. 

  480. /***********************************************************************/

  481. /**

  482.  * @defgroup bitplane VC9 Bitplane decoding

  483.  * @see 8.7, p56

  484.  * @{

  485.  */

  486. 

  487. /** @addtogroup bitplane

  488.  * Imode types

  489.  * @{

  490.  */

  491. enum Imode {

  492.     IMODE_RAW,

  493.     IMODE_NORM2,

  494.     IMODE_DIFF2,

  495.     IMODE_NORM6,

  496.     IMODE_DIFF6,

  497.     IMODE_ROWSKIP,

  498.     IMODE_COLSKIP

  499. };

  500. /** @} */ //imode defines

  501. 

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

  503.  * @param plane Buffer to store decoded bits

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

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

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

  507.  */

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

  509.     int x, y;

  510. 

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

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

  513.             memset(plane, 0, width);

  514.         else

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

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

  517.         plane += stride;

  518.     }

  519. }

  520. 

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

  522.  * @param plane Buffer to store decoded bits

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

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

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

  526.  * @fixme FIXME: Optimize

  527.  */

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

  529.     int x, y;

  530. 

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

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

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

  534.                 plane[y*stride] = 0;

  535.         else

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

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

  538.         plane ++;

  539.     }

  540. }

  541. 

  542. /** Decode a bitplane's bits

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

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

  545.  * @return Status

  546.  * @fixme FIXME: Optimize

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

  548.  */

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

  550. {

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

  552. 

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

  554.     uint8_t invert, *planep = data;

  555.     int width, height, stride;

  556. 

  557.     width = v->s.mb_width;

  558.     height = v->s.mb_height;

  559.     stride = v->s.mb_stride;

  560.     invert = get_bits(gb, 1);

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

  562. 

  563.     *raw_flag = 0;

  564.     switch (imode)

  565.     {

  566.     case IMODE_RAW:

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

  568.         *raw_flag = 1; //invert ignored

  569.         return invert;

  570.     case IMODE_DIFF2:

  571.     case IMODE_NORM2:

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

  573.         {

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

  575.             offset = 1;

  576.         }

  577.         else offset = 0;

  578.         // decode bitplane as one long line

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

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

  581.             *planep++ = code & 1;

  582.             offset++;

  583.             if(offset == width) {

  584.                 offset = 0;

  585.                 planep += stride - width;

  586.             }

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

  588.             offset++;

  589.             if(offset == width) {

  590.                 offset = 0;

  591.                 planep += stride - width;

  592.             }

  593.         }

  594.         break;

  595.     case IMODE_DIFF6:

  596.     case IMODE_NORM6:

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

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

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

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

  601.                     if(code < 0){

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

  603.                         return -1;

  604.                     }

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

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

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

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

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

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

  611.                 }

  612.                 planep += stride * 3;

  613.             }

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

  615.         } else { // 3x2

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

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

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

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

  620.                     if(code < 0){

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

  622.                         return -1;

  623.                     }

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

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

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

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

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

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

  630.                 }

  631.                 planep += stride * 2;

  632.             }

  633.             x = width % 3;

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

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

  636.         }

  637.         break;

  638.     case IMODE_ROWSKIP:

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

  640.         break;

  641.     case IMODE_COLSKIP:

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

  643.         break;

  644.     default: break;

  645.     }

  646. 

  647.     /* Applying diff operator */

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

  649.     {

  650.         planep = data;

  651.         planep[0] ^= invert;

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

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

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

  655.         {

  656.             planep += stride;

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

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

  659.             {

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

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

  662.             }

  663.         }

  664.     }

  665.     else if (invert)

  666.     {

  667.         planep = data;

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

  669.     }

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

  671. }

  672. 

  673. /** @} */ //Bitplane group

  674. 

  675. /***********************************************************************/

  676. /** VOP Dquant decoding

  677.  * @param v VC-1 Context

  678.  */

  679. static int vop_dquant_decoding(VC1Context *v)

  680. {

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

  682.     int pqdiff;

  683. 

  684.     //variable size

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

  686.     {

  687.         pqdiff = get_bits(gb, 3);

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

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

  690.     }

  691.     else

  692.     {

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

  694.         if ( v->dquantfrm )

  695.         {

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

  697.             switch (v->dqprofile)

  698.             {

  699.             case DQPROFILE_SINGLE_EDGE:

  700.             case DQPROFILE_DOUBLE_EDGES:

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

  702.                 break;

  703.             case DQPROFILE_ALL_MBS:

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

  705.             default: break; //Forbidden ?

  706.             }

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

  708.             {

  709.                 pqdiff = get_bits(gb, 3);

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

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

  712.             }

  713.         }

  714.     }

  715.     return 0;

  716. }

  717. 

  718. 

  719. /** Do inverse transform

  720.  */

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

  722. {

  723.     int i;

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

  725.     DCTELEM *src, *dst;

  726. 

  727.     src = block;

  728.     dst = block;

  729.     if(M==4){

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

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

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

  733.             t3 = 22 * src[1];

  734.             t4 = 22 * src[3];

  735.             t5 = 10 * src[1];

  736.             t6 = 10 * src[3];

  737. 

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

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

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

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

  742. 

  743.             src += 8;

  744.             dst += 8;

  745.         }

  746.     }else{

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

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

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

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

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

  752. 

  753.             t5 = t1 + t3;

  754.             t6 = t2 + t4;

  755.             t7 = t2 - t4;

  756.             t8 = t1 - t3;

  757. 

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

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

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

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

  762. 

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

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

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

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

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

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

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

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

  771. 

  772.             src += 8;

  773.             dst += 8;

  774.         }

  775.     }

  776. 

  777.     src = block;

  778.     dst = block;

  779.     if(N==4){

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

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

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

  783.             t3 = 22 * src[ 8];

  784.             t4 = 22 * src[24];

  785.             t5 = 10 * src[ 8];

  786.             t6 = 10 * src[24];

  787. 

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

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

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

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

  792. 

  793.             src ++;

  794.             dst ++;

  795.         }

  796.     }else{

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

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

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

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

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

  802. 

  803.             t5 = t1 + t3;

  804.             t6 = t2 + t4;

  805.             t7 = t2 - t4;

  806.             t8 = t1 - t3;

  807. 

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

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

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

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

  812. 

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

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

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

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

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

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

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

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

  821. 

  822.             src++;

  823.             dst++;

  824.         }

  825.     }

  826. }

  827. 

  828. /** Apply overlap transform to vertical edge

  829.  * @todo optimize

  830.  * @todo move to DSPContext

  831.  */

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

  833. {

  834.     int i;

  835.     int a, b, c, d;

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

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

  838.         b = src[-stride];

  839.         c = src[0];

  840.         d = src[stride];

  841. 

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

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

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

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

  846.         src++;

  847.     }

  848. }

  849. 

  850. /** Apply overlap transform to horizontal edge

  851.  * @todo optimize

  852.  * @todo move to DSPContext

  853.  */

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

  855. {

  856.     int i;

  857.     int a, b, c, d;

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

  859.         a = src[-2];

  860.         b = src[-1];

  861.         c = src[0];

  862.         d = src[1];

  863. 

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

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

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

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

  868.         src += stride;

  869.     }

  870. }

  871. 

  872. /** Put block onto picture

  873.  * @todo move to DSPContext

  874.  */

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

  876. {

  877.     uint8_t *Y;

  878.     int ys, us, vs;

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

  880. 

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

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

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

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

  885. 

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

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

  888.     Y += ys * 8;

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

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

  891. 

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

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

  894. }

  895. 

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

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

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

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

  900. 

  901. /** Do motion compensation over 1 macroblock

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

  903.  */

  904. static void vc1_mc_1mv(VC1Context *v)

  905. {

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

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

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

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

  910. 

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

  912. 

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

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

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

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

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

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

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

  920. 

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

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

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

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

  925. 

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

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

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

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

  930. 

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

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

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

  934. 

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

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

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

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

  939. 

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

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

  942.         srcY = s->edge_emu_buffer;

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

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

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

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

  947.         srcU = uvbuf;

  948.         srcV = uvbuf + 16;

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

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

  951.             int i, j;

  952.             uint8_t *src, *src2;

  953. 

  954.             src = srcY;

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

  956.                 for(i = 0; i < 17; i++) src[i] = v->luty[src[i]];

  957.                 src += s->linesize;

  958.             }

  959.             src = srcU; src2 = srcV;

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

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

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

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

  964.                 }

  965.                 src += s->uvlinesize;

  966.                 src2 += s->uvlinesize;

  967.             }

  968.         }

  969.     }

  970. 

  971.     if(v->fastuvmc) {

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

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

  974.     }

  975. 

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

  977.         mx >>= 1;

  978.         my >>= 1;

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

  980. 

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

  982.     } else {

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

  984. 

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

  986.     }

  987.     uvmx >>= 1;

  988.     uvmy >>= 1;

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

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

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

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

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

  994. }

  995. 

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

  997.  */

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

  999. {

  1000.     MpegEncContext *s = &v->s;

  1001.     DSPContext *dsp = &v->s.dsp;

  1002.     uint8_t *srcY;

  1003.     int dxy, mx, my, src_x, src_y;

  1004.     int off;

  1005. 

  1006.     if(!v->s.last_picture.data[0])return;

  1007.     mx = s->mv[0][n][0];

  1008.     my = s->mv[0][n][1];

  1009.     srcY = s->last_picture.data[0];

  1010. 

  1011.     off = s->linesize * 4 * (n&2) + (n&1) * 8;

  1012. 

  1013.     src_x = s->mb_x * 16 + (n&1) * 8 + (mx >> 2);

  1014.     src_y = s->mb_y * 16 + (n&2) * 4 + (my >> 2);

  1015. 

  1016.     CLIP_RANGE(src_x, s->mb_x, s->mb_width  * 16, 16);

  1017.     CLIP_RANGE(src_y, s->mb_y, s->mb_height * 16, 16);

  1018. 

  1019.     srcY += src_y * s->linesize + src_x;

  1020. 

  1021.     if((unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1022.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1023.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 16+1, 16+1,

  1024.                             src_x, src_y, s->h_edge_pos, s->v_edge_pos);

  1025.         srcY = s->edge_emu_buffer;

  1026.     }

  1027. 

  1028.     if(!s->quarter_sample) { // hpel mc

  1029.         mx >>= 1;

  1030.         my >>= 1;

  1031.         dxy = ((my & 1) << 1) | (mx & 1);

  1032. 

  1033.         dsp->put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  1034.     } else {

  1035.         dxy = ((my & 3) << 2) | (mx & 3);

  1036. 

  1037.         dsp->put_no_rnd_qpel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize);

  1038.     }

  1039. }

  1040. 

  1041. static inline int median4(int a, int b, int c, int d)

  1042. {

  1043.     if(a < b) {

  1044.         if(c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;

  1045.         else      return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  1046.     } else {

  1047.         if(c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;

  1048.         else      return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  1049.     }

  1050. }

  1051. 

  1052. 

  1053. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  1054.  */

  1055. static void vc1_mc_4mv_chroma(VC1Context *v)

  1056. {

  1057.     MpegEncContext *s = &v->s;

  1058.     DSPContext *dsp = &v->s.dsp;

  1059.     uint8_t *srcU, *srcV;

  1060.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  1061.     int i, idx, tx = 0, ty = 0;

  1062.     int mvx[4], mvy[4], intra[4];

  1063.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  1064. 

  1065.     if(!v->s.last_picture.data[0])return;

  1066. 

  1067.     for(i = 0; i < 4; i++) {

  1068.         mvx[i] = s->mv[0][i][0];

  1069.         mvy[i] = s->mv[0][i][1];

  1070.         intra[i] = v->mb_type[0][s->block_index[i]];

  1071.     }

  1072. 

  1073.     /* calculate chroma MV vector from four luma MVs */

  1074.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  1075.     if(!idx) { // all blocks are inter

  1076.         tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  1077.         ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  1078.     } else if(count[idx] == 1) { // 3 inter blocks

  1079.         switch(idx) {

  1080.         case 0x1:

  1081.             tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  1082.             ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  1083.             break;

  1084.         case 0x2:

  1085.             tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  1086.             ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  1087.             break;

  1088.         case 0x4:

  1089.             tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  1090.             ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  1091.             break;

  1092.         case 0x8:

  1093.             tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  1094.             ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  1095.             break;

  1096.         }

  1097.     } else if(count[idx] == 2) {

  1098.         int t1 = 0, t2 = 0;

  1099.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  1100.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

  1101.         tx = (mvx[t1] + mvx[t2]) / 2;

  1102.         ty = (mvy[t1] + mvy[t2]) / 2;

  1103.     } else

  1104.         return; //no need to do MC for inter blocks

  1105. 

  1106.     uvmx = (tx + ((tx&3) == 3)) >> 1;

  1107.     uvmy = (ty + ((ty&3) == 3)) >> 1;

  1108. 

  1109.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1110.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1111. 

  1112.     CLIP_RANGE(uvsrc_x, s->mb_x, s->mb_width  *  8,  8);

  1113.     CLIP_RANGE(uvsrc_y, s->mb_y, s->mb_height *  8,  8);

  1114.     srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1115.     srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1116.     if((unsigned)uvsrc_x > (s->h_edge_pos >> 1) - ((uvmx >> 1)&1) - 8

  1117.        || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - ((uvmy >> 1)&1) - 8){

  1118.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

  1119.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1120.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1121.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1122.         srcU = s->edge_emu_buffer;

  1123.         srcV = s->edge_emu_buffer + 16;

  1124.     }

  1125. 

  1126.     if(v->fastuvmc) {

  1127.         uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));

  1128.         uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));

  1129.     }

  1130. 

  1131.     uvmx >>= 1;

  1132.     uvmy >>= 1;

  1133.     uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);

  1134.     dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize, 8);

  1135.     dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);

  1136. }

  1137. 

  1138. /**

  1139.  * Decode Simple/Main Profiles sequence header

  1140.  * @see Figure 7-8, p16-17

  1141.  * @param avctx Codec context

  1142.  * @param gb GetBit context initialized from Codec context extra_data

  1143.  * @return Status

  1144.  */

  1145. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  1146. {

  1147.     VC1Context *v = avctx->priv_data;

  1148. 

  1149.     av_log(avctx, AV_LOG_INFO, "Header: %0X\n", show_bits(gb, 32));

  1150.     v->profile = get_bits(gb, 2);

  1151.     if (v->profile == 2)

  1152.     {

  1153.         av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");

  1154.         return -1;

  1155.     }

  1156. 

  1157.     if (v->profile == PROFILE_ADVANCED)

  1158.     {

  1159.         v->level = get_bits(gb, 3);

  1160.         if(v->level >= 5)

  1161.         {

  1162.             av_log(avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  1163.         }

  1164.         v->chromaformat = get_bits(gb, 2);

  1165.         if (v->chromaformat != 1)

  1166.         {

  1167.             av_log(avctx, AV_LOG_ERROR,

  1168.                    "Only 4:2:0 chroma format supported\n");

  1169.             return -1;

  1170.         }

  1171.     }

  1172.     else

  1173.     {

  1174.         v->res_sm = get_bits(gb, 2); //reserved

  1175.         if (v->res_sm)

  1176.         {

  1177.             av_log(avctx, AV_LOG_ERROR,

  1178.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  1179.             return -1;

  1180.         }

  1181.     }

  1182. 

  1183.     // (fps-2)/4 (->30)

  1184.     v->frmrtq_postproc = get_bits(gb, 3); //common

  1185.     // (bitrate-32kbps)/64kbps

  1186.     v->bitrtq_postproc = get_bits(gb, 5); //common

  1187.     v->s.loop_filter = get_bits(gb, 1); //common

  1188.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  1189.     {

  1190.         av_log(avctx, AV_LOG_ERROR,

  1191.                "LOOPFILTER shell not be enabled in simple profile\n");

  1192.     }

  1193. 

  1194.     if (v->profile < PROFILE_ADVANCED)

  1195.     {

  1196.         v->res_x8 = get_bits(gb, 1); //reserved

  1197.         if (v->res_x8)

  1198.         {

  1199.             av_log(avctx, AV_LOG_ERROR,

  1200.                    "1 for reserved RES_X8 is forbidden\n");

  1201.             //return -1;

  1202.         }

  1203.         v->multires = get_bits(gb, 1);

  1204.         v->res_fasttx = get_bits(gb, 1);

  1205.         if (!v->res_fasttx)

  1206.         {

  1207.             av_log(avctx, AV_LOG_ERROR,

  1208.                    "0 for reserved RES_FASTTX is forbidden\n");

  1209.             //return -1;

  1210.         }

  1211.     }

  1212. 

  1213.     v->fastuvmc =  get_bits(gb, 1); //common

  1214.     if (!v->profile && !v->fastuvmc)

  1215.     {

  1216.         av_log(avctx, AV_LOG_ERROR,

  1217.                "FASTUVMC unavailable in Simple Profile\n");

  1218.         return -1;

  1219.     }

  1220.     v->extended_mv =  get_bits(gb, 1); //common

  1221.     if (!v->profile && v->extended_mv)

  1222.     {

  1223.         av_log(avctx, AV_LOG_ERROR,

  1224.                "Extended MVs unavailable in Simple Profile\n");

  1225.         return -1;

  1226.     }

  1227.     v->dquant =  get_bits(gb, 2); //common

  1228.     v->vstransform =  get_bits(gb, 1); //common

  1229. 

  1230.     if (v->profile < PROFILE_ADVANCED)

  1231.     {

  1232.         v->res_transtab = get_bits(gb, 1);

  1233.         if (v->res_transtab)

  1234.         {

  1235.             av_log(avctx, AV_LOG_ERROR,

  1236.                    "1 for reserved RES_TRANSTAB is forbidden\n");

  1237.             return -1;

  1238.         }

  1239.     }

  1240. 

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

  1242. 

  1243.     if (v->profile < PROFILE_ADVANCED)

  1244.     {

  1245.         v->s.resync_marker = get_bits(gb, 1);

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

  1247.         if (v->rangered && v->profile == PROFILE_SIMPLE)

  1248.         {

  1249.             av_log(avctx, AV_LOG_INFO,

  1250.                    "RANGERED should be set to 0 in simple profile\n");

  1251.         }

  1252.     }

  1253. 

  1254.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  1255.     v->quantizer_mode = get_bits(gb, 2); //common

  1256. 

  1257.     if (v->profile < PROFILE_ADVANCED)

  1258.     {

  1259.         v->finterpflag = get_bits(gb, 1); //common

  1260.         v->res_rtm_flag = get_bits(gb, 1); //reserved

  1261.         if (!v->res_rtm_flag)

  1262.         {

  1263.             av_log(avctx, AV_LOG_ERROR,

  1264.                    "0 for reserved RES_RTM_FLAG is forbidden\n");

  1265.             //return -1;

  1266.         }

  1267.         av_log(avctx, AV_LOG_DEBUG,

  1268.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  1269.                "LoopFilter=%i, MultiRes=%i, FastUVMV=%i, Extended MV=%i\n"

  1270.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  1271.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  1272.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  1273.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  1274.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  1275.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  1276.                );

  1277.         return 0;

  1278.     }

  1279.     return -1;

  1280. }

  1281. 

  1282. 

  1283. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1284. {

  1285.     int pqindex, lowquant, status;

  1286. 

  1287.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1288.     skip_bits(gb, 2); //framecnt unused

  1289.     v->rangeredfrm = 0;

  1290.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1291.     v->s.pict_type = get_bits(gb, 1);

  1292.     if (v->s.avctx->max_b_frames) {

  1293.         if (!v->s.pict_type) {

  1294.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1295.             else v->s.pict_type = B_TYPE;

  1296.         } else v->s.pict_type = P_TYPE;

  1297.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1298. 

  1299.     if(v->s.pict_type == I_TYPE)

  1300.         get_bits(gb, 7); // skip buffer fullness

  1301. 

  1302.     /* Quantizer stuff */

  1303.     pqindex = get_bits(gb, 5);

  1304.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1305.         v->pq = pquant_table[0][pqindex];

  1306.     else

  1307.         v->pq = pquant_table[v->quantizer_mode-1][pqindex];

  1308. 

  1309.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1310.         v->pquantizer = pqindex < 9;

  1311.     if (v->quantizer_mode == QUANT_UNIFORM || v->quantizer_mode == QUANT_NON_UNIFORM)

  1312.         v->pquantizer = v->quantizer_mode == QUANT_UNIFORM;

  1313.     v->pqindex = pqindex;

  1314.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1315.     else v->halfpq = 0;

  1316.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1317.         v->pquantizer = get_bits(gb, 1);

  1318.     v->dquantfrm = 0;

  1319. 

  1320. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1321. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1322. 

  1323.     //TODO: complete parsing for P/B/BI frames

  1324.     switch(v->s.pict_type) {

  1325.     case P_TYPE:

  1326.         if (v->pq < 5) v->tt_index = 0;

  1327.         else if(v->pq < 13) v->tt_index = 1;

  1328.         else v->tt_index = 2;

  1329. 

  1330.         if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1331.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1332.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1333.         v->range_x = 1 << (v->k_x - 1);

  1334.         v->range_y = 1 << (v->k_y - 1);

  1335.         if (v->profile == PROFILE_ADVANCED)

  1336.         {

  1337.             if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1338.         }

  1339.         else

  1340.             if (v->multires) v->respic = get_bits(gb, 2);

  1341.         lowquant = (v->pq > 12) ? 0 : 1;

  1342.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1343.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1344.         {

  1345.             int scale, shift, i;

  1346.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1347.             v->lumscale = get_bits(gb, 6);

  1348.             v->lumshift = get_bits(gb, 6);

  1349.             /* fill lookup tables for intensity compensation */

  1350.             if(!v->lumscale) {

  1351.                 scale = -64;

  1352.                 shift = (255 - v->lumshift * 2) << 6;

  1353.                 if(v->lumshift > 31)

  1354.                     shift += 128 << 6;

  1355.             } else {

  1356.                 scale = v->lumscale + 32;

  1357.                 if(v->lumshift > 31)

  1358.                     shift = (v->lumshift - 64) << 6;

  1359.                 else

  1360.                     shift = v->lumshift << 6;

  1361.             }

  1362.             for(i = 0; i < 256; i++) {

  1363.                 v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);

  1364.                 v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1365.             }

  1366.         }

  1367.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1368.             v->s.quarter_sample = 0;

  1369.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1370.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1371.                 v->s.quarter_sample = 0;

  1372.             else

  1373.                 v->s.quarter_sample = 1;

  1374.         } else

  1375.             v->s.quarter_sample = 1;

  1376. 

  1377.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1378.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1379.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1380.         {

  1381.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1382.             if (status < 0) return -1;

  1383.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1384.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1385.         } else {

  1386.             v->mv_type_is_raw = 0;

  1387.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1388.         }

  1389.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1390.         if (status < 0) return -1;

  1391.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1392.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1393. 

  1394.         /* Hopefully this is correct for P frames */

  1395.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1396.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1397. 

  1398.         if (v->dquant)

  1399.         {

  1400.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1401.             vop_dquant_decoding(v);

  1402.         }

  1403. 

  1404.         v->ttfrm = 0; //FIXME Is that so ?

  1405.         if (v->vstransform)

  1406.         {

  1407.             v->ttmbf = get_bits(gb, 1);

  1408.             if (v->ttmbf)

  1409.             {

  1410.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1411.             }

  1412.         }

  1413.         break;

  1414.     case B_TYPE:

  1415.         break;

  1416.     }

  1417. 

  1418.     /* AC Syntax */

  1419.     v->c_ac_table_index = decode012(gb);

  1420.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1421.     {

  1422.         v->y_ac_table_index = decode012(gb);

  1423.     }

  1424.     /* DC Syntax */

  1425.     v->s.dc_table_index = get_bits(gb, 1);

  1426. 

  1427.     return 0;

  1428. }

  1429. 

  1430. /***********************************************************************/

  1431. /**

  1432.  * @defgroup block VC-1 Block-level functions

  1433.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1434.  * @todo TODO: Integrate to MpegEncContext facilities

  1435.  * @{

  1436.  */

  1437. 

  1438. /**

  1439.  * @def GET_MQUANT

  1440.  * @brief Get macroblock-level quantizer scale

  1441.  * @warning XXX: qdiff to the frame quant, not previous quant ?

  1442.  * @fixme XXX: Don't know how to initialize mquant otherwise in last case

  1443.  */

  1444. #define GET_MQUANT()                                           \

  1445.   if (v->dquantfrm)                                            \

  1446.   {                                                            \

  1447.     int edges = 0;                                             \

  1448.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1449.     {                                                          \

  1450.       if (v->dqbilevel)                                        \

  1451.       {                                                        \

  1452.         mquant = (get_bits(gb, 1)) ? v->pq : v->altpq;         \

  1453.       }                                                        \

  1454.       else                                                     \

  1455.       {                                                        \

  1456.         mqdiff = get_bits(gb, 3);                              \

  1457.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1458.         else mquant = get_bits(gb, 5);                         \

  1459.       }                                                        \

  1460.     }                                                          \

  1461.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1462.         edges = 1 << v->dqsbedge;                              \

  1463.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1464.         edges = (3 << v->dqsbedge) % 15;                       \

  1465.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1466.         edges = 15;                                            \

  1467.     mquant = v->pq;                                            \

  1468.     if((edges&1) && !s->mb_x)                                  \

  1469.         mquant = v->altpq;                                     \

  1470.     if((edges&2) && !s->mb_y)                                  \

  1471.         mquant = v->altpq;                                     \

  1472.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1473.         mquant = v->altpq;                                     \

  1474.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1475.         mquant = v->altpq;                                     \

  1476.   }

  1477. 

  1478. /**

  1479.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1480.  * @brief Get MV differentials

  1481.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1482.  * @param _dmv_x Horizontal differential for decoded MV

  1483.  * @param _dmv_y Vertical differential for decoded MV

  1484.  * @todo TODO: Use MpegEncContext arrays to store them

  1485.  */

  1486. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1487.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1488.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1489.   if (index > 36)                                                   \

  1490.   {                                                                 \

  1491.     mb_has_coeffs = 1;                                              \

  1492.     index -= 37;                                                    \

  1493.   }                                                                 \

  1494.   else mb_has_coeffs = 0;                                           \

  1495.   s->mb_intra = 0;                                                  \

  1496.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1497.   else if (index == 35)                                             \

  1498.   {                                                                 \

  1499.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1500.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1501.   }                                                                 \

  1502.   else if (index == 36)                                             \

  1503.   {                                                                 \

  1504.     _dmv_x = 0;                                                     \

  1505.     _dmv_y = 0;                                                     \

  1506.     s->mb_intra = 1;                                                \

  1507.   }                                                                 \

  1508.   else                                                              \

  1509.   {                                                                 \

  1510.     index1 = index%6;                                               \

  1511.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1512.     else                                   val = 0;                 \

  1513.     if(size_table[index1] - val > 0)                                \

  1514.         val = get_bits(gb, size_table[index1] - val);               \

  1515.     else                                   val = 0;                 \

  1516.     sign = 0 - (val&1);                                             \

  1517.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1518.                                                                     \

  1519.     index1 = index/6;                                               \

  1520.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1521.     else                                   val = 0;                 \

  1522.     if(size_table[index1] - val > 0)                                \

  1523.         val = get_bits(gb, size_table[index1] - val);               \

  1524.     else                                   val = 0;                 \

  1525.     sign = 0 - (val&1);                                             \

  1526.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1527.   }

  1528. 

  1529. /** Predict and set motion vector

  1530.  */

  1531. 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)

  1532. {

  1533.     int xy, wrap, off = 0;

  1534.     int16_t *A, *B, *C;

  1535.     int px, py;

  1536.     int sum;

  1537. 

  1538.     /* scale MV difference to be quad-pel */

  1539.     dmv_x <<= 1 - s->quarter_sample;

  1540.     dmv_y <<= 1 - s->quarter_sample;

  1541. 

  1542.     wrap = s->b8_stride;

  1543.     xy = s->block_index[n];

  1544. 

  1545.     if(s->mb_intra){

  1546.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1547.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1548.         if(mv1) { /* duplicate motion data for 1-MV block */

  1549.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1550.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1551.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1552.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1553.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

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

  1555.         }

  1556.         return;

  1557.     }

  1558. 

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

  1560.     A = s->current_picture.motion_val[0][xy - wrap];

  1561.     if(mv1)

  1562.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1563.     else {

  1564.         //in 4-MV mode different blocks have different B predictor position

  1565.         switch(n){

  1566.         case 0:

  1567.             off = (s->mb_x > 0) ? -1 : 1;

  1568.             break;

  1569.         case 1:

  1570.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1571.             break;

  1572.         case 2:

  1573.             off = 1;

  1574.             break;

  1575.         case 3:

  1576.             off = -1;

  1577.         }

  1578.     }

  1579.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1580. 

  1581.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1582.         if(s->mb_width == 1) {

  1583.             px = A[0];

  1584.             py = A[1];

  1585.         } else {

  1586.             px = mid_pred(A[0], B[0], C[0]);

  1587.             py = mid_pred(A[1], B[1], C[1]);

  1588.         }

  1589.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1590.         px = C[0];

  1591.         py = C[1];

  1592.     } else {

  1593.         px = py = 0;

  1594.     }

  1595.     /* Pullback MV as specified in 8.3.5.3.4 */

  1596.     {

  1597.         int qx, qy, X, Y;

  1598.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1599.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1600.         X = (s->mb_width << 6) - 4;

  1601.         Y = (s->mb_height << 6) - 4;

  1602.         if(mv1) {

  1603.             if(qx + px < -60) px = -60 - qx;

  1604.             if(qy + py < -60) py = -60 - qy;

  1605.         } else {

  1606.             if(qx + px < -28) px = -28 - qx;

  1607.             if(qy + py < -28) py = -28 - qy;

  1608.         }

  1609.         if(qx + px > X) px = X - qx;

  1610.         if(qy + py > Y) py = Y - qy;

  1611.     }

  1612.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1613.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1614.         if(is_intra[xy - wrap])

  1615.             sum = ABS(px) + ABS(py);

  1616.         else

  1617.             sum = ABS(px - A[0]) + ABS(py - A[1]);

  1618.         if(sum > 32) {

  1619.             if(get_bits1(&s->gb)) {

  1620.                 px = A[0];

  1621.                 py = A[1];

  1622.             } else {

  1623.                 px = C[0];

  1624.                 py = C[1];

  1625.             }

  1626.         } else {

  1627.             if(is_intra[xy - 1])

  1628.                 sum = ABS(px) + ABS(py);

  1629.             else

  1630.                 sum = ABS(px - C[0]) + ABS(py - C[1]);

  1631.             if(sum > 32) {

  1632.                 if(get_bits1(&s->gb)) {

  1633.                     px = A[0];

  1634.                     py = A[1];

  1635.                 } else {

  1636.                     px = C[0];

  1637.                     py = C[1];

  1638.                 }

  1639.             }

  1640.         }

  1641.     }

  1642.     /* store MV using signed modulus of MV range defined in 4.11 */

  1643.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1644.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1645.     if(mv1) { /* duplicate motion data for 1-MV block */

  1646.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1647.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1648.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1649.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1650.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

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

  1652.     }

  1653. }

  1654. 

  1655. /** Get predicted DC value for I-frames only

  1656.  * prediction dir: left=0, top=1

  1657.  * @param s MpegEncContext

  1658.  * @param[in] n block index in the current MB

  1659.  * @param dc_val_ptr Pointer to DC predictor

  1660.  * @param dir_ptr Prediction direction for use in AC prediction

  1661.  */

  1662. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1663.                               int16_t **dc_val_ptr, int *dir_ptr)

  1664. {

  1665.     int a, b, c, wrap, pred, scale;

  1666.     int16_t *dc_val;

  1667.     static const uint16_t dcpred[32] = {

  1668.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  1669.          114,  102,   93,   85,   79,   73,   68,   64,

  1670.           60,   57,   54,   51,   49,   47,   45,   43,

  1671.           41,   39,   38,   37,   35,   34,   33

  1672.     };

  1673. 

  1674.     /* find prediction - wmv3_dc_scale always used here in fact */

  1675.     if (n < 4)     scale = s->y_dc_scale;

  1676.     else           scale = s->c_dc_scale;

  1677. 

  1678.     wrap = s->block_wrap[n];

  1679.     dc_val= s->dc_val[0] + s->block_index[n];

  1680. 

  1681.     /* B A

  1682.      * C X

  1683.      */

  1684.     c = dc_val[ - 1];

  1685.     b = dc_val[ - 1 - wrap];

  1686.     a = dc_val[ - wrap];

  1687. 

  1688.     if (pq < 9 || !overlap)

  1689.     {

  1690.         /* Set outer values */

  1691.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  1692.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  1693.     }

  1694.     else

  1695.     {

  1696.         /* Set outer values */

  1697.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  1698.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  1699.     }

  1700. 

  1701.     if (abs(a - b) <= abs(b - c)) {

  1702.         pred = c;

  1703.         *dir_ptr = 1;//left

  1704.     } else {

  1705.         pred = a;

  1706.         *dir_ptr = 0;//top

  1707.     }

  1708. 

  1709.     /* update predictor */

  1710.     *dc_val_ptr = &dc_val[0];

  1711.     return pred;

  1712. }

  1713. 

  1714. 

  1715. /** Get predicted DC value

  1716.  * prediction dir: left=0, top=1

  1717.  * @param s MpegEncContext

  1718.  * @param[in] n block index in the current MB

  1719.  * @param dc_val_ptr Pointer to DC predictor

  1720.  * @param dir_ptr Prediction direction for use in AC prediction

  1721.  */

  1722. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  1723.                               int a_avail, int c_avail,

  1724.                               int16_t **dc_val_ptr, int *dir_ptr)

  1725. {

  1726.     int a, b, c, wrap, pred, scale;

  1727.     int16_t *dc_val;

  1728.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1729.     int q1, q2 = 0;

  1730. 

  1731.     /* find prediction - wmv3_dc_scale always used here in fact */

  1732.     if (n < 4)     scale = s->y_dc_scale;

  1733.     else           scale = s->c_dc_scale;

  1734. 

  1735.     wrap = s->block_wrap[n];

  1736.     dc_val= s->dc_val[0] + s->block_index[n];

  1737. 

  1738.     /* B A

  1739.      * C X

  1740.      */

  1741.     c = dc_val[ - 1];

  1742.     b = dc_val[ - 1 - wrap];

  1743.     a = dc_val[ - wrap];

  1744. 

  1745.     if(a_avail && c_avail) {

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

  1747.             pred = c;

  1748.             *dir_ptr = 1;//left

  1749.             q2 = s->current_picture.qscale_table[mb_pos - 1];

  1750.         } else {

  1751.             pred = a;

  1752.             *dir_ptr = 0;//top

  1753.             q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  1754.         }

  1755.     } else if(a_avail) {

  1756.         pred = a;

  1757.         *dir_ptr = 0;//top

  1758.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  1759.     } else if(c_avail) {

  1760.         pred = c;

  1761.         *dir_ptr = 1;//left

  1762.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  1763.     } else {

  1764.         pred = 0;

  1765.         *dir_ptr = 1;//left

  1766.     }

  1767. 

  1768.     /* scale coeffs if needed */

  1769.     q1 = s->current_picture.qscale_table[mb_pos];

  1770.     if(n && n<4) q2=q1;

  1771. 

  1772.     if(q2 && q1!=q2) {

  1773.         pred = (pred * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  1774.     }

  1775. 

  1776.     /* update predictor */

  1777.     *dc_val_ptr = &dc_val[0];

  1778.     return pred;

  1779. }

  1780. 

  1781. 

  1782. /**

  1783.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  1784.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1785.  * @todo TODO: Integrate to MpegEncContext facilities

  1786.  * @{

  1787.  */

  1788. 

  1789. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  1790. {

  1791.     int xy, wrap, pred, a, b, c;

  1792. 

  1793.     xy = s->block_index[n];

  1794.     wrap = s->b8_stride;

  1795. 

  1796.     /* B C

  1797.      * A X

  1798.      */

  1799.     a = s->coded_block[xy - 1       ];

  1800.     b = s->coded_block[xy - 1 - wrap];

  1801.     c = s->coded_block[xy     - wrap];

  1802. 

  1803.     if (b == c) {

  1804.         pred = a;

  1805.     } else {

  1806.         pred = c;

  1807.     }

  1808. 

  1809.     /* store value */

  1810.     *coded_block_ptr = &s->coded_block[xy];

  1811. 

  1812.     return pred;

  1813. }

  1814. 

  1815. /**

  1816.  * Decode one AC coefficient

  1817.  * @param v The VC1 context

  1818.  * @param last Last coefficient

  1819.  * @param skip How much zero coefficients to skip

  1820.  * @param value Decoded AC coefficient value

  1821.  * @see 8.1.3.4

  1822.  */

  1823. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  1824. {

  1825.     GetBitContext *gb = &v->s.gb;

  1826.     int index, escape, run = 0, level = 0, lst = 0;

  1827. 

  1828.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1829.     if (index != vc1_ac_sizes[codingset] - 1) {

  1830.         run = vc1_index_decode_table[codingset][index][0];

  1831.         level = vc1_index_decode_table[codingset][index][1];

  1832.         lst = index >= vc1_last_decode_table[codingset];

  1833.         if(get_bits(gb, 1))

  1834.             level = -level;

  1835.     } else {

  1836.         escape = decode210(gb);

  1837.         if (escape != 2) {

  1838.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  1839.             run = vc1_index_decode_table[codingset][index][0];

  1840.             level = vc1_index_decode_table[codingset][index][1];

  1841.             lst = index >= vc1_last_decode_table[codingset];

  1842.             if(escape == 0) {

  1843.                 if(lst)

  1844.                     level += vc1_last_delta_level_table[codingset][run];

  1845.                 else

  1846.                     level += vc1_delta_level_table[codingset][run];

  1847.             } else {

  1848.                 if(lst)

  1849.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  1850.                 else

  1851.                     run += vc1_delta_run_table[codingset][level] + 1;

  1852.             }

  1853.             if(get_bits(gb, 1))

  1854.                 level = -level;

  1855.         } else {

  1856.             int sign;

  1857.             lst = get_bits(gb, 1);

  1858.             if(v->s.esc3_level_length == 0) {

  1859.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  1860.                     v->s.esc3_level_length = get_bits(gb, 3);

  1861.                     if(!v->s.esc3_level_length)

  1862.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  1863.                 } else { //table 60

  1864.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  1865.                 }

  1866.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  1867.             }

  1868.             run = get_bits(gb, v->s.esc3_run_length);

  1869.             sign = get_bits(gb, 1);

  1870.             level = get_bits(gb, v->s.esc3_level_length);

  1871.             if(sign)

  1872.                 level = -level;

  1873.         }

  1874.     }

  1875. 

  1876.     *last = lst;

  1877.     *skip = run;

  1878.     *value = level;

  1879. }

  1880. 

  1881. /** Decode intra block in intra frames - should be faster than decode_intra_block

  1882.  * @param v VC1Context

  1883.  * @param block block to decode

  1884.  * @param coded are AC coeffs present or not

  1885.  * @param codingset set of VLC to decode data

  1886.  */

  1887. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  1888. {

  1889.     GetBitContext *gb = &v->s.gb;

  1890.     MpegEncContext *s = &v->s;

  1891.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  1892.     int run_diff, i;

  1893.     int16_t *dc_val;

  1894.     int16_t *ac_val, *ac_val2;

  1895.     int dcdiff;

  1896. 

  1897.     /* Get DC differential */

  1898.     if (n < 4) {

  1899.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1900.     } else {

  1901.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  1902.     }

  1903.     if (dcdiff < 0){

  1904.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  1905.         return -1;

  1906.     }

  1907.     if (dcdiff)

  1908.     {

  1909.         if (dcdiff == 119 /* ESC index value */)

  1910.         {

  1911.             /* TODO: Optimize */

  1912.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  1913.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  1914.             else dcdiff = get_bits(gb, 8);

  1915.         }

  1916.         else

  1917.         {

  1918.             if (v->pq == 1)

  1919.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  1920.             else if (v->pq == 2)

  1921.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  1922.         }

  1923.         if (get_bits(gb, 1))

  1924.             dcdiff = -dcdiff;

  1925.     }

  1926. 

  1927.     /* Prediction */

  1928.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  1929.     *dc_val = dcdiff;

  1930. 

  1931.     /* Store the quantized DC coeff, used for prediction */

  1932.     if (n < 4) {

  1933.         block[0] = dcdiff * s->y_dc_scale;

  1934.     } else {

  1935.         block[0] = dcdiff * s->c_dc_scale;

  1936.     }

  1937.     /* Skip ? */

  1938.     run_diff = 0;

  1939.     i = 0;

  1940.     if (!coded) {

  1941.         goto not_coded;

  1942.     }

  1943. 

  1944.     //AC Decoding

  1945.     i = 1;

  1946. 

  1947.     {

  1948.         int last = 0, skip, value;

  1949.         const int8_t *zz_table;

  1950.         int scale;

  1951.         int k;

  1952. 

  1953.         scale = v->pq * 2 + v->halfpq;

  1954. 

  1955.         if(v->s.ac_pred) {

  1956.             if(!dc_pred_dir)

  1957.                 zz_table = vc1_horizontal_zz;

  1958.             else

  1959.                 zz_table = vc1_vertical_zz;

  1960.         } else

  1961.             zz_table = vc1_normal_zz;

  1962. 

  1963.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  1964.         ac_val2 = ac_val;

  1965.         if(dc_pred_dir) //left

  1966.             ac_val -= 16;

  1967.         else //top

  1968.             ac_val -= 16 * s->block_wrap[n];

  1969. 

  1970.         while (!last) {

  1971.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  1972.             i += skip;

  1973.             if(i > 63)

  1974.                 break;

  1975.             block[zz_table[i++]] = value;

  1976.         }

  1977. 

  1978.         /* apply AC prediction if needed */

  1979.         if(s->ac_pred) {

  1980.             if(dc_pred_dir) { //left

  1981.                 for(k = 1; k < 8; k++)

  1982.                     block[k << 3] += ac_val[k];

  1983.             } else { //top

  1984.                 for(k = 1; k < 8; k++)

  1985.                     block[k] += ac_val[k + 8];

  1986.             }

  1987.         }

  1988.         /* save AC coeffs for further prediction */

  1989.         for(k = 1; k < 8; k++) {

  1990.             ac_val2[k] = block[k << 3];

  1991.             ac_val2[k + 8] = block[k];

  1992.         }

  1993. 

  1994.         /* scale AC coeffs */

  1995.         for(k = 1; k < 64; k++)

  1996.             if(block[k]) {

  1997.                 block[k] *= scale;

  1998.                 if(!v->pquantizer)

  1999.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2000.             }

  2001. 

  2002.         if(s->ac_pred) i = 63;

  2003.     }

  2004. 

  2005. not_coded:

  2006.     if(!coded) {

  2007.         int k, scale;

  2008.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2009.         ac_val2 = ac_val;

  2010. 

  2011.         scale = v->pq * 2 + v->halfpq;

  2012.         memset(ac_val2, 0, 16 * 2);

  2013.         if(dc_pred_dir) {//left

  2014.             ac_val -= 16;

  2015.             if(s->ac_pred)

  2016.                 memcpy(ac_val2, ac_val, 8 * 2);

  2017.         } else {//top

  2018.             ac_val -= 16 * s->block_wrap[n];

  2019.             if(s->ac_pred)

  2020.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2021.         }

  2022. 

  2023.         /* apply AC prediction if needed */

  2024.         if(s->ac_pred) {

  2025.             if(dc_pred_dir) { //left

  2026.                 for(k = 1; k < 8; k++) {

  2027.                     block[k << 3] = ac_val[k] * scale;

  2028.                     if(!v->pquantizer)

  2029.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2030.                 }

  2031.             } else { //top

  2032.                 for(k = 1; k < 8; k++) {

  2033.                     block[k] = ac_val[k + 8] * scale;

  2034.                     if(!v->pquantizer)

  2035.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2036.                 }

  2037.             }

  2038.             i = 63;

  2039.         }

  2040.     }

  2041.     s->block_last_index[n] = i;

  2042. 

  2043.     return 0;

  2044. }

  2045. 

  2046. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2047.  * @param v VC1Context

  2048.  * @param block block to decode

  2049.  * @param coded are AC coeffs present or not

  2050.  * @param mquant block quantizer

  2051.  * @param codingset set of VLC to decode data

  2052.  */

  2053. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2054. {

  2055.     GetBitContext *gb = &v->s.gb;

  2056.     MpegEncContext *s = &v->s;

  2057.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2058.     int run_diff, i;

  2059.     int16_t *dc_val;

  2060.     int16_t *ac_val, *ac_val2;

  2061.     int dcdiff;

  2062.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2063.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2064.     int use_pred = s->ac_pred;

  2065.     int scale;

  2066.     int q1, q2 = 0;

  2067. 

  2068.     /* XXX: Guard against dumb values of mquant */

  2069.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2070. 

  2071.     /* Set DC scale - y and c use the same */

  2072.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2073.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2074. 

  2075.     /* Get DC differential */

  2076.     if (n < 4) {

  2077.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2078.     } else {

  2079.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2080.     }

  2081.     if (dcdiff < 0){

  2082.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2083.         return -1;

  2084.     }

  2085.     if (dcdiff)

  2086.     {

  2087.         if (dcdiff == 119 /* ESC index value */)

  2088.         {

  2089.             /* TODO: Optimize */

  2090.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2091.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2092.             else dcdiff = get_bits(gb, 8);

  2093.         }

  2094.         else

  2095.         {

  2096.             if (mquant == 1)

  2097.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2098.             else if (mquant == 2)

  2099.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2100.         }

  2101.         if (get_bits(gb, 1))

  2102.             dcdiff = -dcdiff;

  2103.     }

  2104. 

  2105.     /* Prediction */

  2106.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2107.     *dc_val = dcdiff;

  2108. 

  2109.     /* Store the quantized DC coeff, used for prediction */

  2110. 

  2111.     if (n < 4) {

  2112.         block[0] = dcdiff * s->y_dc_scale;

  2113.     } else {

  2114.         block[0] = dcdiff * s->c_dc_scale;

  2115.     }

  2116.     /* Skip ? */

  2117.     run_diff = 0;

  2118.     i = 0;

  2119. 

  2120.     //AC Decoding

  2121.     i = 1;

  2122. 

  2123.     /* check if AC is needed at all and adjust direction if needed */

  2124.     if(!a_avail) dc_pred_dir = 1;

  2125.     if(!c_avail) dc_pred_dir = 0;

  2126.     if(!a_avail && !c_avail) use_pred = 0;

  2127.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2128.     ac_val2 = ac_val;

  2129. 

  2130.     scale = mquant * 2;

  2131. 

  2132.     if(dc_pred_dir) //left

  2133.         ac_val -= 16;

  2134.     else //top

  2135.         ac_val -= 16 * s->block_wrap[n];

  2136. 

  2137.     q1 = s->current_picture.qscale_table[mb_pos];

  2138.     if(dc_pred_dir && c_avail) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2139.     if(!dc_pred_dir && a_avail) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2140.     if(n && n<4) q2 = q1;

  2141. 

  2142.     if(coded) {

  2143.         int last = 0, skip, value;

  2144.         const int8_t *zz_table;

  2145.         int k;

  2146. 

  2147.         zz_table = vc1_simple_progressive_8x8_zz;

  2148. 

  2149.         while (!last) {

  2150.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2151.             i += skip;

  2152.             if(i > 63)

  2153.                 break;

  2154.             block[zz_table[i++]] = value;

  2155.         }

  2156. 

  2157.         /* apply AC prediction if needed */

  2158.         if(use_pred) {

  2159.             /* scale predictors if needed*/

  2160.             if(q2 && q1!=q2) {

  2161.                 q1 = q1 * 2 - 1;

  2162.                 q2 = q2 * 2 - 1;

  2163. 

  2164.                 if(dc_pred_dir) { //left

  2165.                     for(k = 1; k < 8; k++)

  2166.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2167.                 } else { //top

  2168.                     for(k = 1; k < 8; k++)

  2169.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2170.                 }

  2171.             } else {

  2172.                 if(dc_pred_dir) { //left

  2173.                     for(k = 1; k < 8; k++)

  2174.                         block[k << 3] += ac_val[k];

  2175.                 } else { //top

  2176.                     for(k = 1; k < 8; k++)

  2177.                         block[k] += ac_val[k + 8];

  2178.                 }

  2179.             }

  2180.         }

  2181.         /* save AC coeffs for further prediction */

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

  2183.             ac_val2[k] = block[k << 3];

  2184.             ac_val2[k + 8] = block[k];

  2185.         }

  2186. 

  2187.         /* scale AC coeffs */

  2188.         for(k = 1; k < 64; k++)

  2189.             if(block[k]) {

  2190.                 block[k] *= scale;

  2191.                 if(!v->pquantizer)

  2192.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2193.             }

  2194. 

  2195.         if(use_pred) i = 63;

  2196.     } else { // no AC coeffs

  2197.         int k;

  2198. 

  2199.         memset(ac_val2, 0, 16 * 2);

  2200.         if(dc_pred_dir) {//left

  2201.             if(use_pred) {

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

  2203.                 if(q2 && q1!=q2) {

  2204.                     q1 = q1 * 2 - 1;

  2205.                     q2 = q2 * 2 - 1;

  2206.                     for(k = 1; k < 8; k++)

  2207.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2208.                 }

  2209.             }

  2210.         } else {//top

  2211.             if(use_pred) {

  2212.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2213.                 if(q2 && q1!=q2) {

  2214.                     q1 = q1 * 2 - 1;

  2215.                     q2 = q2 * 2 - 1;

  2216.                     for(k = 1; k < 8; k++)

  2217.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2218.                 }

  2219.             }

  2220.         }

  2221. 

  2222.         /* apply AC prediction if needed */

  2223.         if(use_pred) {

  2224.             if(dc_pred_dir) { //left

  2225.                 for(k = 1; k < 8; k++) {

  2226.                     block[k << 3] = ac_val2[k] * scale;

  2227.                     if(!v->pquantizer)

  2228.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2229.                 }

  2230.             } else { //top

  2231.                 for(k = 1; k < 8; k++) {

  2232.                     block[k] = ac_val2[k + 8] * scale;

  2233.                     if(!v->pquantizer)

  2234.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2235.                 }

  2236.             }

  2237.             i = 63;

  2238.         }

  2239.     }

  2240.     s->block_last_index[n] = i;

  2241. 

  2242.     return 0;

  2243. }

  2244. 

  2245. /** Decode P block

  2246.  */

  2247. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2248. {

  2249.     MpegEncContext *s = &v->s;

  2250.     GetBitContext *gb = &s->gb;

  2251.     int i, j;

  2252.     int subblkpat = 0;

  2253.     int scale, off, idx, last, skip, value;

  2254.     int ttblk = ttmb & 7;

  2255. 

  2256.     if(ttmb == -1) {

  2257.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2258.     }

  2259.     if(ttblk == TT_4X4) {

  2260.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2261.     }

  2262.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2263.         subblkpat = decode012(gb);

  2264.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2265.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2266.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2267.     }

  2268.     scale = 2 * mquant;

  2269. 

  2270.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2271.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2272.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2273.         ttblk = TT_8X4;

  2274.     }

  2275.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2276.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2277.         ttblk = TT_4X8;

  2278.     }

  2279.     switch(ttblk) {

  2280.     case TT_8X8:

  2281.         i = 0;

  2282.         last = 0;

  2283.         while (!last) {

  2284.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2285.             i += skip;

  2286.             if(i > 63)

  2287.                 break;

  2288.             idx = vc1_simple_progressive_8x8_zz[i++];

  2289.             block[idx] = value * scale;

  2290.         }

  2291.         vc1_inv_trans(block, 8, 8);

  2292.         break;

  2293.     case TT_4X4:

  2294.         for(j = 0; j < 4; j++) {

  2295.             last = subblkpat & (1 << (3 - j));

  2296.             i = 0;

  2297.             off = (j & 1) * 4 + (j & 2) * 16;

  2298.             while (!last) {

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

  2300.                 i += skip;

  2301.                 if(i > 15)

  2302.                     break;

  2303.                 idx = vc1_simple_progressive_4x4_zz[i++];

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

  2305.             }

  2306.             if(!(subblkpat & (1 << (3 - j))))

  2307.                 vc1_inv_trans(block + off, 4, 4);

  2308.         }

  2309.         break;

  2310.     case TT_8X4:

  2311.         for(j = 0; j < 2; j++) {

  2312.             last = subblkpat & (1 << (1 - j));

  2313.             i = 0;

  2314.             off = j * 32;

  2315.             while (!last) {

  2316.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2317.                 i += skip;

  2318.                 if(i > 31)

  2319.                     break;

  2320.                 idx = vc1_simple_progressive_8x4_zz[i++];

  2321.                 block[idx + off] = value * scale;

  2322.             }

  2323.             if(!(subblkpat & (1 << (1 - j))))

  2324.                 vc1_inv_trans(block + off, 8, 4);

  2325.         }

  2326.         break;

  2327.     case TT_4X8:

  2328.         for(j = 0; j < 2; j++) {

  2329.             last = subblkpat & (1 << (1 - j));

  2330.             i = 0;

  2331.             off = j * 4;

  2332.             while (!last) {

  2333.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2334.                 i += skip;

  2335.                 if(i > 31)

  2336.                     break;

  2337.                 idx = vc1_simple_progressive_4x8_zz[i++];

  2338.                 block[idx + off] = value * scale;

  2339.             }

  2340.             if(!(subblkpat & (1 << (1 - j))))

  2341.                 vc1_inv_trans(block + off, 4, 8);

  2342.         }

  2343.         break;

  2344.     }

  2345.     return 0;

  2346. }

  2347. 

  2348. 

  2349. /** Decode one P-frame MB (in Simple/Main profile)

  2350.  * @todo TODO: Extend to AP

  2351.  * @fixme FIXME: DC value for inter blocks not set

  2352.  */

  2353. static int vc1_decode_p_mb(VC1Context *v, DCTELEM block[6][64])

  2354. {

  2355.     MpegEncContext *s = &v->s;

  2356.     GetBitContext *gb = &s->gb;

  2357.     int i, j;

  2358.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2359.     int cbp; /* cbp decoding stuff */

  2360.     int mqdiff, mquant; /* MB quantization */

  2361.     int ttmb = v->ttfrm; /* MB Transform type */

  2362.     int status;

  2363. 

  2364.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  2365.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  2366.     int mb_has_coeffs = 1; /* last_flag */

  2367.     int dmv_x, dmv_y; /* Differential MV components */

  2368.     int index, index1; /* LUT indices */

  2369.     int val, sign; /* temp values */

  2370.     int first_block = 1;

  2371.     int dst_idx, off;

  2372.     int skipped, fourmv;

  2373. 

  2374.     mquant = v->pq; /* Loosy initialization */

  2375. 

  2376.     if (v->mv_type_is_raw)

  2377.         fourmv = get_bits1(gb);

  2378.     else

  2379.         fourmv = v->mv_type_mb_plane[mb_pos];

  2380.     if (v->skip_is_raw)

  2381.         skipped = get_bits1(gb);

  2382.     else

  2383.         skipped = v->s.mbskip_table[mb_pos];

  2384. 

  2385.     s->dsp.clear_blocks(s->block[0]);

  2386. 

  2387.     if (!fourmv) /* 1MV mode */

  2388.     {

  2389.         if (!skipped)

  2390.         {

  2391.             GET_MVDATA(dmv_x, dmv_y);

  2392. 

  2393.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  2394.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  2395. 

  2396.             /* FIXME Set DC val for inter block ? */

  2397.             if (s->mb_intra && !mb_has_coeffs)

  2398.             {

  2399.                 GET_MQUANT();

  2400.                 s->ac_pred = get_bits(gb, 1);

  2401.                 cbp = 0;

  2402.             }

  2403.             else if (mb_has_coeffs)

  2404.             {

  2405.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  2406.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2407.                 GET_MQUANT();

  2408.             }

  2409.             else

  2410.             {

  2411.                 mquant = v->pq;

  2412.                 cbp = 0;

  2413.             }

  2414.             s->current_picture.qscale_table[mb_pos] = mquant;

  2415. 

  2416.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  2417.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  2418.                                 VC1_TTMB_VLC_BITS, 2);

  2419.             if(!s->mb_intra) vc1_mc_1mv(v);

  2420.             dst_idx = 0;

  2421.             for (i=0; i<6; i++)

  2422.             {

  2423.                 s->dc_val[0][s->block_index[i]] = 0;

  2424.                 dst_idx += i >> 2;

  2425.                 val = ((cbp >> (5 - i)) & 1);

  2426.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2427.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  2428.                 if(s->mb_intra) {

  2429.                     /* check if prediction blocks A and C are available */

  2430.                     v->a_avail = v->c_avail = 0;

  2431.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2432.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2433.                     if(i == 1 || i == 3 || s->mb_x)

  2434.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2435. 

  2436.                     vc1_decode_intra_block(v, block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  2437.                     vc1_inv_trans(block[i], 8, 8);

  2438.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2439.                     s->dsp.put_pixels_clamped(block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2440.                     /* TODO: proper loop filtering */

  2441.                     if(v->pq >= 9 && v->overlap) {

  2442.                         if(v->a_avail)

  2443.                             vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2444.                         if(v->c_avail)

  2445.                             vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2446.                     }

  2447.                 } else if(val) {

  2448.                     vc1_decode_p_block(v, block[i], i, mquant, ttmb, first_block);

  2449.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2450.                     first_block = 0;

  2451.                     s->dsp.add_pixels_clamped(block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2452.                 }

  2453.             }

  2454.         }

  2455.         else //Skipped

  2456.         {

  2457.             s->mb_intra = 0;

  2458.             for(i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2459.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  2460.             s->current_picture.qscale_table[mb_pos] = 0;

  2461.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  2462.             vc1_mc_1mv(v);

  2463.             return 0;

  2464.         }

  2465.     } //1MV mode

  2466.     else //4MV mode

  2467.     {

  2468.         if (!skipped /* unskipped MB */)

  2469.         {

  2470.             int intra_count = 0, coded_inter = 0;

  2471.             int is_intra[6], is_coded[6];

  2472.             /* Get CBPCY */

  2473.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2474.             for (i=0; i<6; i++)

  2475.             {

  2476.                 val = ((cbp >> (5 - i)) & 1);

  2477.                 s->dc_val[0][s->block_index[i]] = 0;

  2478.                 s->mb_intra = 0;

  2479.                 if(i < 4) {

  2480.                     dmv_x = dmv_y = 0;

  2481.                     s->mb_intra = 0;

  2482.                     mb_has_coeffs = 0;

  2483.                     if(val) {

  2484.                         GET_MVDATA(dmv_x, dmv_y);

  2485.                     }

  2486.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  2487.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  2488.                     intra_count += s->mb_intra;

  2489.                     is_intra[i] = s->mb_intra;

  2490.                     is_coded[i] = mb_has_coeffs;

  2491.                 }

  2492.                 if(i&4){

  2493.                     is_intra[i] = (intra_count >= 3);

  2494.                     is_coded[i] = val;

  2495.                 }

  2496.                 if(i == 4) vc1_mc_4mv_chroma(v);

  2497.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  2498.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  2499.             }

  2500.             dst_idx = 0;

  2501.             GET_MQUANT();

  2502.             s->current_picture.qscale_table[mb_pos] = mquant;

  2503.             /* test if block is intra and has pred */

  2504.             {

  2505.                 int intrapred = 0;

  2506.                 for(i=0; i<6; i++)

  2507.                     if(is_intra[i]) {

  2508.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  2509.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  2510.                             intrapred = 1;

  2511.                             break;

  2512.                         }

  2513.                     }

  2514.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  2515.                 else s->ac_pred = 0;

  2516.             }

  2517.             if (!v->ttmbf && coded_inter)

  2518.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 12);

  2519.             for (i=0; i<6; i++)

  2520.             {

  2521.                 dst_idx += i >> 2;

  2522.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2523.                 s->mb_intra = is_intra[i];

  2524.                 if (is_intra[i]) {

  2525.                     /* check if prediction blocks A and C are available */

  2526.                     v->a_avail = v->c_avail = 0;

  2527.                     if(i == 2 || i == 3 || !s->first_slice_line)

  2528.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2529.                     if(i == 1 || i == 3 || s->mb_x)

  2530.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2531. 

  2532.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  2533.                     vc1_inv_trans(block[i], 8, 8);

  2534.                     for(j = 0; j < 64; j++) block[i][j] += 128;

  2535.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2536.                     /* TODO: proper loop filtering */

  2537.                     if(v->pq >= 9 && v->overlap) {

  2538.                         if(v->a_avail)

  2539.                             vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2540.                         if(v->c_avail)

  2541.                             vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  2542.                     }

  2543.                 } else if(is_coded[i]) {

  2544.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  2545.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  2546.                     first_block = 0;

  2547.                     s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  2548.                 }

  2549.             }

  2550.             return status;

  2551.         }

  2552.         else //Skipped MB

  2553.         {

  2554.             s->mb_intra = 0;

  2555.             for (i=0; i<6; i++) v->mb_type[0][s->block_index[i]] = 0;

  2556.             for (i=0; i<4; i++)

  2557.             {

  2558.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  2559.                 vc1_mc_4mv_luma(v, i);

  2560.             }

  2561.             vc1_mc_4mv_chroma(v);

  2562.             s->current_picture.qscale_table[mb_pos] = 0;

  2563.             return 0;

  2564.         }

  2565.     }

  2566. 

  2567.     /* Should never happen */

  2568.     return -1;

  2569. }

  2570. 

  2571. /** Decode blocks of I-frame

  2572.  */

  2573. static void vc1_decode_i_blocks(VC1Context *v)

  2574. {

  2575.     int k, j;

  2576.     MpegEncContext *s = &v->s;

  2577.     int cbp, val;

  2578.     uint8_t *coded_val;

  2579.     int mb_pos;

  2580. 

  2581.     /* select codingmode used for VLC tables selection */

  2582.     switch(v->y_ac_table_index){

  2583.     case 0:

  2584.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2585.         break;

  2586.     case 1:

  2587.         v->codingset = CS_HIGH_MOT_INTRA;

  2588.         break;

  2589.     case 2:

  2590.         v->codingset = CS_MID_RATE_INTRA;

  2591.         break;

  2592.     }

  2593. 

  2594.     switch(v->c_ac_table_index){

  2595.     case 0:

  2596.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2597.         break;

  2598.     case 1:

  2599.         v->codingset2 = CS_HIGH_MOT_INTER;

  2600.         break;

  2601.     case 2:

  2602.         v->codingset2 = CS_MID_RATE_INTER;

  2603.         break;

  2604.     }

  2605. 

  2606.     /* Set DC scale - y and c use the same */

  2607.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2608.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2609. 

  2610.     //do frame decode

  2611.     s->mb_x = s->mb_y = 0;

  2612.     s->mb_intra = 1;

  2613.     s->first_slice_line = 1;

  2614.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2615.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2616.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2617.             ff_init_block_index(s);

  2618.             ff_update_block_index(s);

  2619.             s->dsp.clear_blocks(s->block[0]);

  2620.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2621.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2622.             s->current_picture.qscale_table[mb_pos] = v->pq;

  2623. 

  2624.             // do actual MB decoding and displaying

  2625.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2626.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  2627. 

  2628.             for(k = 0; k < 6; k++) {

  2629.                 val = ((cbp >> (5 - k)) & 1);

  2630. 

  2631.                 if (k < 4) {

  2632.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  2633.                     val = val ^ pred;

  2634.                     *coded_val = val;

  2635.                 }

  2636.                 cbp |= val << (5 - k);

  2637. 

  2638.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  2639. 

  2640.                 vc1_inv_trans(s->block[k], 8, 8);

  2641.                 if(v->pq >= 9 && v->overlap) {

  2642.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  2643.                 }

  2644.             }

  2645. 

  2646.             vc1_put_block(v, s->block);

  2647.             if(v->pq >= 9 && v->overlap) { /* XXX: do proper overlapping insted of loop filter */

  2648.                 if(!s->first_slice_line) {

  2649.                     vc1_v_overlap(s->dest[0], s->linesize);

  2650.                     vc1_v_overlap(s->dest[0] + 8, s->linesize);

  2651.                     vc1_v_overlap(s->dest[1], s->uvlinesize);

  2652.                     vc1_v_overlap(s->dest[2], s->uvlinesize);

  2653.                 }

  2654.                 vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2655.                 vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2656.                 if(s->mb_x) {

  2657.                     vc1_h_overlap(s->dest[0], s->linesize);

  2658.                     vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2659.                     vc1_h_overlap(s->dest[1], s->uvlinesize);

  2660.                     vc1_h_overlap(s->dest[2], s->uvlinesize);

  2661.                 }

  2662.                 vc1_h_overlap(s->dest[0] + 8, s->linesize);

  2663.                 vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2664.             }

  2665. 

  2666.             if(get_bits_count(&s->gb) > v->bits) {

  2667.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  2668.                 return;

  2669.             }

  2670.         }

  2671.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2672.         s->first_slice_line = 0;

  2673.     }

  2674. }

  2675. 

  2676. static void vc1_decode_p_blocks(VC1Context *v)

  2677. {

  2678.     MpegEncContext *s = &v->s;

  2679. 

  2680.     /* select codingmode used for VLC tables selection */

  2681.     switch(v->c_ac_table_index){

  2682.     case 0:

  2683.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2684.         break;

  2685.     case 1:

  2686.         v->codingset = CS_HIGH_MOT_INTRA;

  2687.         break;

  2688.     case 2:

  2689.         v->codingset = CS_MID_RATE_INTRA;

  2690.         break;

  2691.     }

  2692. 

  2693.     switch(v->c_ac_table_index){

  2694.     case 0:

  2695.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2696.         break;

  2697.     case 1:

  2698.         v->codingset2 = CS_HIGH_MOT_INTER;

  2699.         break;

  2700.     case 2:

  2701.         v->codingset2 = CS_MID_RATE_INTER;

  2702.         break;

  2703.     }

  2704. 

  2705.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  2706.     s->first_slice_line = 1;

  2707.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  2708.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  2709.             ff_init_block_index(s);

  2710.             ff_update_block_index(s);

  2711.             s->dsp.clear_blocks(s->block[0]);

  2712. 

  2713.             vc1_decode_p_mb(v, s->block);

  2714.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2715.                 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);

  2716.                 return;

  2717.             }

  2718.         }

  2719.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  2720.         s->first_slice_line = 0;

  2721.     }

  2722. }

  2723. 

  2724. static void vc1_decode_blocks(VC1Context *v)

  2725. {

  2726. 

  2727.     v->s.esc3_level_length = 0;

  2728. 

  2729.     switch(v->s.pict_type) {

  2730.     case I_TYPE:

  2731.         vc1_decode_i_blocks(v);

  2732.         break;

  2733.     case P_TYPE:

  2734.         vc1_decode_p_blocks(v);

  2735.         break;

  2736.     }

  2737. }

  2738. 

  2739. 

  2740. /** Initialize a VC1/WMV3 decoder

  2741.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2742.  * @todo TODO: Decypher remaining bits in extra_data

  2743.  */

  2744. static int vc1_decode_init(AVCodecContext *avctx)

  2745. {

  2746.     VC1Context *v = avctx->priv_data;

  2747.     MpegEncContext *s = &v->s;

  2748.     GetBitContext gb;

  2749. 

  2750.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  2751.     avctx->pix_fmt = PIX_FMT_YUV420P;

  2752.     v->s.avctx = avctx;

  2753.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  2754.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  2755. 

  2756.     if(ff_h263_decode_init(avctx) < 0)

  2757.         return -1;

  2758.     if (vc1_init_common(v) < 0) return -1;

  2759. 

  2760.     av_log(avctx, AV_LOG_INFO, "This decoder is not supposed to produce picture. Dont report this as a bug!\n");

  2761.     av_log(avctx, AV_LOG_INFO, "If you see a picture, don't believe your eyes.\n");

  2762. 

  2763.     avctx->coded_width = avctx->width;

  2764.     avctx->coded_height = avctx->height;

  2765.     if (avctx->codec_id == CODEC_ID_WMV3)

  2766.     {

  2767.         int count = 0;

  2768. 

  2769.         // looks like WMV3 has a sequence header stored in the extradata

  2770.         // advanced sequence header may be before the first frame

  2771.         // the last byte of the extradata is a version number, 1 for the

  2772.         // samples we can decode

  2773. 

  2774.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  2775. 

  2776.         if (decode_sequence_header(avctx, &gb) < 0)

  2777.           return -1;

  2778. 

  2779.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  2780.         if (count>0)

  2781.         {

  2782.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  2783.                    count, get_bits(&gb, count));

  2784.         }

  2785.         else if (count < 0)

  2786.         {

  2787.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  2788.         }

  2789.     }

  2790.     avctx->has_b_frames= !!(avctx->max_b_frames);

  2791. 

  2792.     s->mb_width = (avctx->coded_width+15)>>4;

  2793.     s->mb_height = (avctx->coded_height+15)>>4;

  2794. 

  2795.     /* Allocate mb bitplanes */

  2796.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  2797. 

  2798.     /* allocate block type info in that way so it could be used with s->block_index[] */

  2799.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  2800.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  2801.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  2802.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  2803. 

  2804.     /* Init coded blocks info */

  2805.     if (v->profile == PROFILE_ADVANCED)

  2806.     {

  2807. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  2808. //            return -1;

  2809. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  2810. //            return -1;

  2811.     }

  2812. 

  2813.     return 0;

  2814. }

  2815. 

  2816. 

  2817. /** Decode a VC1/WMV3 frame

  2818.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  2819.  * @warning Initial try at using MpegEncContext stuff

  2820.  */

  2821. static int vc1_decode_frame(AVCodecContext *avctx,

  2822.                             void *data, int *data_size,

  2823.                             uint8_t *buf, int buf_size)

  2824. {

  2825.     VC1Context *v = avctx->priv_data;

  2826.     MpegEncContext *s = &v->s;

  2827.     AVFrame *pict = data;

  2828. 

  2829.     /* no supplementary picture */

  2830.     if (buf_size == 0) {

  2831.         /* special case for last picture */

  2832.         if (s->low_delay==0 && s->next_picture_ptr) {

  2833.             *pict= *(AVFrame*)s->next_picture_ptr;

  2834.             s->next_picture_ptr= NULL;

  2835. 

  2836.             *data_size = sizeof(AVFrame);

  2837.         }

  2838. 

  2839.         return 0;

  2840.     }

  2841. 

  2842.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  2843.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  2844.         int i= ff_find_unused_picture(s, 0);

  2845.         s->current_picture_ptr= &s->picture[i];

  2846.     }

  2847. 

  2848.     avctx->has_b_frames= !s->low_delay;

  2849. 

  2850.     init_get_bits(&s->gb, buf, buf_size*8);

  2851.     // do parse frame header

  2852.     if(vc1_parse_frame_header(v, &s->gb) == -1)

  2853.         return -1;

  2854. 

  2855.     if(s->pict_type != I_TYPE && s->pict_type != P_TYPE)return -1;

  2856. 

  2857.     // for hurry_up==5

  2858.     s->current_picture.pict_type= s->pict_type;

  2859.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  2860. 

  2861.     /* skip B-frames if we don't have reference frames */

  2862.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return -1;//buf_size;

  2863.     /* skip b frames if we are in a hurry */

  2864.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  2865.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  2866.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  2867.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  2868.         return buf_size;

  2869.     /* skip everything if we are in a hurry>=5 */

  2870.     if(avctx->hurry_up>=5) return -1;//buf_size;

  2871. 

  2872.     if(s->next_p_frame_damaged){

  2873.         if(s->pict_type==B_TYPE)

  2874.             return buf_size;

  2875.         else

  2876.             s->next_p_frame_damaged=0;

  2877.     }

  2878. 

  2879.     if(MPV_frame_start(s, avctx) < 0)

  2880.         return -1;

  2881. 

  2882.     ff_er_frame_start(s);

  2883. 

  2884.     v->bits = buf_size * 8;

  2885.     vc1_decode_blocks(v);

  2886. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  2887. //  if(get_bits_count(&s->gb) > buf_size * 8)

  2888. //      return -1;

  2889.     ff_er_frame_end(s);

  2890. 

  2891.     MPV_frame_end(s);

  2892. 

  2893. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  2894. assert(s->current_picture.pict_type == s->pict_type);

  2895.     if (s->pict_type == B_TYPE || s->low_delay) {

  2896.         *pict= *(AVFrame*)s->current_picture_ptr;

  2897.     } else if (s->last_picture_ptr != NULL) {

  2898.         *pict= *(AVFrame*)s->last_picture_ptr;

  2899.     }

  2900. 

  2901.     if(s->last_picture_ptr || s->low_delay){

  2902.         *data_size = sizeof(AVFrame);

  2903.         ff_print_debug_info(s, pict);

  2904.     }

  2905. 

  2906.     /* Return the Picture timestamp as the frame number */

  2907.     /* we substract 1 because it is added on utils.c    */

  2908.     avctx->frame_number = s->picture_number - 1;

  2909. 

  2910.     return buf_size;

  2911. }

  2912. 

  2913. 

  2914. /** Close a VC1/WMV3 decoder

  2915.  * @warning Initial try at using MpegEncContext stuff

  2916.  */

  2917. static int vc1_decode_end(AVCodecContext *avctx)

  2918. {

  2919.     VC1Context *v = avctx->priv_data;

  2920. 

  2921.     av_freep(&v->hrd_rate);

  2922.     av_freep(&v->hrd_buffer);

  2923.     MPV_common_end(&v->s);

  2924.     av_freep(&v->mv_type_mb_plane);

  2925.     av_freep(&v->mb_type_base);

  2926.     return 0;

  2927. }

  2928. 

  2929. 

  2930. AVCodec vc1_decoder = {

  2931.     "vc1",

  2932.     CODEC_TYPE_VIDEO,

  2933.     CODEC_ID_VC1,

  2934.     sizeof(VC1Context),

  2935.     vc1_decode_init,

  2936.     NULL,

  2937.     vc1_decode_end,

  2938.     vc1_decode_frame,

  2939.     CODEC_CAP_DELAY,

  2940.     NULL

  2941. };

  2942. 

  2943. AVCodec wmv3_decoder = {

  2944.     "wmv3",

  2945.     CODEC_TYPE_VIDEO,

  2946.     CODEC_ID_WMV3,

  2947.     sizeof(VC1Context),

  2948.     vc1_decode_init,

  2949.     NULL,

  2950.     vc1_decode_end,

  2951.     vc1_decode_frame,

  2952.     CODEC_CAP_DELAY,

  2953.     NULL

  2954. };