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FFmpeg/libavcodec/h264_cavlc.c

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  1. /*

  2.  * H.26L/H.264/AVC/JVT/14496-10/... cavlc bitstream decoding

  3.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

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

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

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * H.264 / AVC / MPEG4 part10 cavlc bitstream decoding.

  25.  * @author Michael Niedermayer <michaelni@gmx.at>

  26.  */

  27. 

  28. #define CABAC 0

  29. 

  30. #include "internal.h"

  31. #include "avcodec.h"

  32. #include "mpegvideo.h"

  33. #include "h264.h"

  34. #include "h264data.h" // FIXME FIXME FIXME

  35. #include "h264_mvpred.h"

  36. #include "golomb.h"

  37. 

  38. //#undef NDEBUG

  39. #include <assert.h>

  40. 

  41. static const uint8_t golomb_to_inter_cbp_gray[16]={

  42.  0, 1, 2, 4, 8, 3, 5,10,12,15, 7,11,13,14, 6, 9,

  43. };

  44. 

  45. static const uint8_t golomb_to_intra4x4_cbp_gray[16]={

  46. 15, 0, 7,11,13,14, 3, 5,10,12, 1, 2, 4, 8, 6, 9,

  47. };

  48. 

  49. static const uint8_t chroma_dc_coeff_token_len[4*5]={

  50.  2, 0, 0, 0,

  51.  6, 1, 0, 0,

  52.  6, 6, 3, 0,

  53.  6, 7, 7, 6,

  54.  6, 8, 8, 7,

  55. };

  56. 

  57. static const uint8_t chroma_dc_coeff_token_bits[4*5]={

  58.  1, 0, 0, 0,

  59.  7, 1, 0, 0,

  60.  4, 6, 1, 0,

  61.  3, 3, 2, 5,

  62.  2, 3, 2, 0,

  63. };

  64. 

  65. static const uint8_t chroma422_dc_coeff_token_len[4*9]={

  66.   1,  0,  0,  0,

  67.   7,  2,  0,  0,

  68.   7,  7,  3,  0,

  69.   9,  7,  7,  5,

  70.   9,  9,  7,  6,

  71.  10, 10,  9,  7,

  72.  11, 11, 10,  7,

  73.  12, 12, 11, 10,

  74.  13, 12, 12, 11,

  75. };

  76. 

  77. static const uint8_t chroma422_dc_coeff_token_bits[4*9]={

  78.   1,   0,  0, 0,

  79.  15,   1,  0, 0,

  80.  14,  13,  1, 0,

  81.   7,  12, 11, 1,

  82.   6,   5, 10, 1,

  83.   7,   6,  4, 9,

  84.   7,   6,  5, 8,

  85.   7,   6,  5, 4,

  86.   7,   5,  4, 4,

  87. };

  88. 

  89. static const uint8_t coeff_token_len[4][4*17]={

  90. {

  91.      1, 0, 0, 0,

  92.      6, 2, 0, 0,     8, 6, 3, 0,     9, 8, 7, 5,    10, 9, 8, 6,

  93.     11,10, 9, 7,    13,11,10, 8,    13,13,11, 9,    13,13,13,10,

  94.     14,14,13,11,    14,14,14,13,    15,15,14,14,    15,15,15,14,

  95.     16,15,15,15,    16,16,16,15,    16,16,16,16,    16,16,16,16,

  96. },

  97. {

  98.      2, 0, 0, 0,

  99.      6, 2, 0, 0,     6, 5, 3, 0,     7, 6, 6, 4,     8, 6, 6, 4,

  100.      8, 7, 7, 5,     9, 8, 8, 6,    11, 9, 9, 6,    11,11,11, 7,

  101.     12,11,11, 9,    12,12,12,11,    12,12,12,11,    13,13,13,12,

  102.     13,13,13,13,    13,14,13,13,    14,14,14,13,    14,14,14,14,

  103. },

  104. {

  105.      4, 0, 0, 0,

  106.      6, 4, 0, 0,     6, 5, 4, 0,     6, 5, 5, 4,     7, 5, 5, 4,

  107.      7, 5, 5, 4,     7, 6, 6, 4,     7, 6, 6, 4,     8, 7, 7, 5,

  108.      8, 8, 7, 6,     9, 8, 8, 7,     9, 9, 8, 8,     9, 9, 9, 8,

  109.     10, 9, 9, 9,    10,10,10,10,    10,10,10,10,    10,10,10,10,

  110. },

  111. {

  112.      6, 0, 0, 0,

  113.      6, 6, 0, 0,     6, 6, 6, 0,     6, 6, 6, 6,     6, 6, 6, 6,

  114.      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,

  115.      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,

  116.      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,

  117. }

  118. };

  119. 

  120. static const uint8_t coeff_token_bits[4][4*17]={

  121. {

  122.      1, 0, 0, 0,

  123.      5, 1, 0, 0,     7, 4, 1, 0,     7, 6, 5, 3,     7, 6, 5, 3,

  124.      7, 6, 5, 4,    15, 6, 5, 4,    11,14, 5, 4,     8,10,13, 4,

  125.     15,14, 9, 4,    11,10,13,12,    15,14, 9,12,    11,10,13, 8,

  126.     15, 1, 9,12,    11,14,13, 8,     7,10, 9,12,     4, 6, 5, 8,

  127. },

  128. {

  129.      3, 0, 0, 0,

  130.     11, 2, 0, 0,     7, 7, 3, 0,     7,10, 9, 5,     7, 6, 5, 4,

  131.      4, 6, 5, 6,     7, 6, 5, 8,    15, 6, 5, 4,    11,14,13, 4,

  132.     15,10, 9, 4,    11,14,13,12,     8,10, 9, 8,    15,14,13,12,

  133.     11,10, 9,12,     7,11, 6, 8,     9, 8,10, 1,     7, 6, 5, 4,

  134. },

  135. {

  136.     15, 0, 0, 0,

  137.     15,14, 0, 0,    11,15,13, 0,     8,12,14,12,    15,10,11,11,

  138.     11, 8, 9,10,     9,14,13, 9,     8,10, 9, 8,    15,14,13,13,

  139.     11,14,10,12,    15,10,13,12,    11,14, 9,12,     8,10,13, 8,

  140.     13, 7, 9,12,     9,12,11,10,     5, 8, 7, 6,     1, 4, 3, 2,

  141. },

  142. {

  143.      3, 0, 0, 0,

  144.      0, 1, 0, 0,     4, 5, 6, 0,     8, 9,10,11,    12,13,14,15,

  145.     16,17,18,19,    20,21,22,23,    24,25,26,27,    28,29,30,31,

  146.     32,33,34,35,    36,37,38,39,    40,41,42,43,    44,45,46,47,

  147.     48,49,50,51,    52,53,54,55,    56,57,58,59,    60,61,62,63,

  148. }

  149. };

  150. 

  151. static const uint8_t total_zeros_len[16][16]= {

  152.     {1,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9},

  153.     {3,3,3,3,3,4,4,4,4,5,5,6,6,6,6},

  154.     {4,3,3,3,4,4,3,3,4,5,5,6,5,6},

  155.     {5,3,4,4,3,3,3,4,3,4,5,5,5},

  156.     {4,4,4,3,3,3,3,3,4,5,4,5},

  157.     {6,5,3,3,3,3,3,3,4,3,6},

  158.     {6,5,3,3,3,2,3,4,3,6},

  159.     {6,4,5,3,2,2,3,3,6},

  160.     {6,6,4,2,2,3,2,5},

  161.     {5,5,3,2,2,2,4},

  162.     {4,4,3,3,1,3},

  163.     {4,4,2,1,3},

  164.     {3,3,1,2},

  165.     {2,2,1},

  166.     {1,1},

  167. };

  168. 

  169. static const uint8_t total_zeros_bits[16][16]= {

  170.     {1,3,2,3,2,3,2,3,2,3,2,3,2,3,2,1},

  171.     {7,6,5,4,3,5,4,3,2,3,2,3,2,1,0},

  172.     {5,7,6,5,4,3,4,3,2,3,2,1,1,0},

  173.     {3,7,5,4,6,5,4,3,3,2,2,1,0},

  174.     {5,4,3,7,6,5,4,3,2,1,1,0},

  175.     {1,1,7,6,5,4,3,2,1,1,0},

  176.     {1,1,5,4,3,3,2,1,1,0},

  177.     {1,1,1,3,3,2,2,1,0},

  178.     {1,0,1,3,2,1,1,1},

  179.     {1,0,1,3,2,1,1},

  180.     {0,1,1,2,1,3},

  181.     {0,1,1,1,1},

  182.     {0,1,1,1},

  183.     {0,1,1},

  184.     {0,1},

  185. };

  186. 

  187. static const uint8_t chroma_dc_total_zeros_len[3][4]= {

  188.     { 1, 2, 3, 3,},

  189.     { 1, 2, 2, 0,},

  190.     { 1, 1, 0, 0,},

  191. };

  192. 

  193. static const uint8_t chroma_dc_total_zeros_bits[3][4]= {

  194.     { 1, 1, 1, 0,},

  195.     { 1, 1, 0, 0,},

  196.     { 1, 0, 0, 0,},

  197. };

  198. 

  199. static const uint8_t chroma422_dc_total_zeros_len[7][8]= {

  200.     { 1, 3, 3, 4, 4, 4, 5, 5 },

  201.     { 3, 2, 3, 3, 3, 3, 3 },

  202.     { 3, 3, 2, 2, 3, 3 },

  203.     { 3, 2, 2, 2, 3 },

  204.     { 2, 2, 2, 2 },

  205.     { 2, 2, 1 },

  206.     { 1, 1 },

  207. };

  208. 

  209. static const uint8_t chroma422_dc_total_zeros_bits[7][8]= {

  210.     { 1, 2, 3, 2, 3, 1, 1, 0 },

  211.     { 0, 1, 1, 4, 5, 6, 7 },

  212.     { 0, 1, 1, 2, 6, 7 },

  213.     { 6, 0, 1, 2, 7 },

  214.     { 0, 1, 2, 3 },

  215.     { 0, 1, 1 },

  216.     { 0, 1 },

  217. };

  218. 

  219. static const uint8_t run_len[7][16]={

  220.     {1,1},

  221.     {1,2,2},

  222.     {2,2,2,2},

  223.     {2,2,2,3,3},

  224.     {2,2,3,3,3,3},

  225.     {2,3,3,3,3,3,3},

  226.     {3,3,3,3,3,3,3,4,5,6,7,8,9,10,11},

  227. };

  228. 

  229. static const uint8_t run_bits[7][16]={

  230.     {1,0},

  231.     {1,1,0},

  232.     {3,2,1,0},

  233.     {3,2,1,1,0},

  234.     {3,2,3,2,1,0},

  235.     {3,0,1,3,2,5,4},

  236.     {7,6,5,4,3,2,1,1,1,1,1,1,1,1,1},

  237. };

  238. 

  239. static VLC coeff_token_vlc[4];

  240. static VLC_TYPE coeff_token_vlc_tables[520+332+280+256][2];

  241. static const int coeff_token_vlc_tables_size[4]={520,332,280,256};

  242. 

  243. static VLC chroma_dc_coeff_token_vlc;

  244. static VLC_TYPE chroma_dc_coeff_token_vlc_table[256][2];

  245. static const int chroma_dc_coeff_token_vlc_table_size = 256;

  246. 

  247. static VLC chroma422_dc_coeff_token_vlc;

  248. static VLC_TYPE chroma422_dc_coeff_token_vlc_table[8192][2];

  249. static const int chroma422_dc_coeff_token_vlc_table_size = 8192;

  250. 

  251. static VLC total_zeros_vlc[15];

  252. static VLC_TYPE total_zeros_vlc_tables[15][512][2];

  253. static const int total_zeros_vlc_tables_size = 512;

  254. 

  255. static VLC chroma_dc_total_zeros_vlc[3];

  256. static VLC_TYPE chroma_dc_total_zeros_vlc_tables[3][8][2];

  257. static const int chroma_dc_total_zeros_vlc_tables_size = 8;

  258. 

  259. static VLC chroma422_dc_total_zeros_vlc[7];

  260. static VLC_TYPE chroma422_dc_total_zeros_vlc_tables[7][32][2];

  261. static const int chroma422_dc_total_zeros_vlc_tables_size = 32;

  262. 

  263. static VLC run_vlc[6];

  264. static VLC_TYPE run_vlc_tables[6][8][2];

  265. static const int run_vlc_tables_size = 8;

  266. 

  267. static VLC run7_vlc;

  268. static VLC_TYPE run7_vlc_table[96][2];

  269. static const int run7_vlc_table_size = 96;

  270. 

  271. #define LEVEL_TAB_BITS 8

  272. static int8_t cavlc_level_tab[7][1<<LEVEL_TAB_BITS][2];

  273. 

  274. #define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8

  275. #define CHROMA422_DC_COEFF_TOKEN_VLC_BITS 13

  276. #define COEFF_TOKEN_VLC_BITS           8

  277. #define TOTAL_ZEROS_VLC_BITS           9

  278. #define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3

  279. #define CHROMA422_DC_TOTAL_ZEROS_VLC_BITS 5

  280. #define RUN_VLC_BITS                   3

  281. #define RUN7_VLC_BITS                  6

  282. 

  283. /**

  284.  * gets the predicted number of non-zero coefficients.

  285.  * @param n block index

  286.  */

  287. static inline int pred_non_zero_count(H264Context *h, int n){

  288.     const int index8= scan8[n];

  289.     const int left= h->non_zero_count_cache[index8 - 1];

  290.     const int top = h->non_zero_count_cache[index8 - 8];

  291.     int i= left + top;

  292. 

  293.     if(i<64) i= (i+1)>>1;

  294. 

  295.     tprintf(h->s.avctx, "pred_nnz L%X T%X n%d s%d P%X\n", left, top, n, scan8[n], i&31);

  296. 

  297.     return i&31;

  298. }

  299. 

  300. static av_cold void init_cavlc_level_tab(void){

  301.     int suffix_length, mask;

  302.     unsigned int i;

  303. 

  304.     for(suffix_length=0; suffix_length<7; suffix_length++){

  305.         for(i=0; i<(1<<LEVEL_TAB_BITS); i++){

  306.             int prefix= LEVEL_TAB_BITS - av_log2(2*i);

  307.             int level_code= (prefix<<suffix_length) + (i>>(LEVEL_TAB_BITS-prefix-1-suffix_length)) - (1<<suffix_length);

  308. 

  309.             mask= -(level_code&1);

  310.             level_code= (((2+level_code)>>1) ^ mask) - mask;

  311.             if(prefix + 1 + suffix_length <= LEVEL_TAB_BITS){

  312.                 cavlc_level_tab[suffix_length][i][0]= level_code;

  313.                 cavlc_level_tab[suffix_length][i][1]= prefix + 1 + suffix_length;

  314.             }else if(prefix + 1 <= LEVEL_TAB_BITS){

  315.                 cavlc_level_tab[suffix_length][i][0]= prefix+100;

  316.                 cavlc_level_tab[suffix_length][i][1]= prefix + 1;

  317.             }else{

  318.                 cavlc_level_tab[suffix_length][i][0]= LEVEL_TAB_BITS+100;

  319.                 cavlc_level_tab[suffix_length][i][1]= LEVEL_TAB_BITS;

  320.             }

  321.         }

  322.     }

  323. }

  324. 

  325. av_cold void ff_h264_decode_init_vlc(void){

  326.     static int done = 0;

  327. 

  328.     if (!done) {

  329.         int i;

  330.         int offset;

  331.         done = 1;

  332. 

  333.         chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;

  334.         chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;

  335.         init_vlc(&chroma_dc_coeff_token_vlc, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 4*5,

  336.                  &chroma_dc_coeff_token_len [0], 1, 1,

  337.                  &chroma_dc_coeff_token_bits[0], 1, 1,

  338.                  INIT_VLC_USE_NEW_STATIC);

  339. 

  340.         chroma422_dc_coeff_token_vlc.table = chroma422_dc_coeff_token_vlc_table;

  341.         chroma422_dc_coeff_token_vlc.table_allocated = chroma422_dc_coeff_token_vlc_table_size;

  342.         init_vlc(&chroma422_dc_coeff_token_vlc, CHROMA422_DC_COEFF_TOKEN_VLC_BITS, 4*9,

  343.                  &chroma422_dc_coeff_token_len [0], 1, 1,

  344.                  &chroma422_dc_coeff_token_bits[0], 1, 1,

  345.                  INIT_VLC_USE_NEW_STATIC);

  346. 

  347.         offset = 0;

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

  349.             coeff_token_vlc[i].table = coeff_token_vlc_tables+offset;

  350.             coeff_token_vlc[i].table_allocated = coeff_token_vlc_tables_size[i];

  351.             init_vlc(&coeff_token_vlc[i], COEFF_TOKEN_VLC_BITS, 4*17,

  352.                      &coeff_token_len [i][0], 1, 1,

  353.                      &coeff_token_bits[i][0], 1, 1,

  354.                      INIT_VLC_USE_NEW_STATIC);

  355.             offset += coeff_token_vlc_tables_size[i];

  356.         }

  357.         /*

  358.          * This is a one time safety check to make sure that

  359.          * the packed static coeff_token_vlc table sizes

  360.          * were initialized correctly.

  361.          */

  362.         assert(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));

  363. 

  364.         for(i=0; i<3; i++){

  365.             chroma_dc_total_zeros_vlc[i].table = chroma_dc_total_zeros_vlc_tables[i];

  366.             chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;

  367.             init_vlc(&chroma_dc_total_zeros_vlc[i],

  368.                      CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,

  369.                      &chroma_dc_total_zeros_len [i][0], 1, 1,

  370.                      &chroma_dc_total_zeros_bits[i][0], 1, 1,

  371.                      INIT_VLC_USE_NEW_STATIC);

  372.         }

  373. 

  374.         for(i=0; i<7; i++){

  375.             chroma422_dc_total_zeros_vlc[i].table = chroma422_dc_total_zeros_vlc_tables[i];

  376.             chroma422_dc_total_zeros_vlc[i].table_allocated = chroma422_dc_total_zeros_vlc_tables_size;

  377.             init_vlc(&chroma422_dc_total_zeros_vlc[i],

  378.                      CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 8,

  379.                      &chroma422_dc_total_zeros_len [i][0], 1, 1,

  380.                      &chroma422_dc_total_zeros_bits[i][0], 1, 1,

  381.                      INIT_VLC_USE_NEW_STATIC);

  382.         }

  383. 

  384.         for(i=0; i<15; i++){

  385.             total_zeros_vlc[i].table = total_zeros_vlc_tables[i];

  386.             total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;

  387.             init_vlc(&total_zeros_vlc[i],

  388.                      TOTAL_ZEROS_VLC_BITS, 16,

  389.                      &total_zeros_len [i][0], 1, 1,

  390.                      &total_zeros_bits[i][0], 1, 1,

  391.                      INIT_VLC_USE_NEW_STATIC);

  392.         }

  393. 

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

  395.             run_vlc[i].table = run_vlc_tables[i];

  396.             run_vlc[i].table_allocated = run_vlc_tables_size;

  397.             init_vlc(&run_vlc[i],

  398.                      RUN_VLC_BITS, 7,

  399.                      &run_len [i][0], 1, 1,

  400.                      &run_bits[i][0], 1, 1,

  401.                      INIT_VLC_USE_NEW_STATIC);

  402.         }

  403.         run7_vlc.table = run7_vlc_table,

  404.         run7_vlc.table_allocated = run7_vlc_table_size;

  405.         init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,

  406.                  &run_len [6][0], 1, 1,

  407.                  &run_bits[6][0], 1, 1,

  408.                  INIT_VLC_USE_NEW_STATIC);

  409. 

  410.         init_cavlc_level_tab();

  411.     }

  412. }

  413. 

  414. /**

  415.  *

  416.  */

  417. static inline int get_level_prefix(GetBitContext *gb){

  418.     unsigned int buf;

  419.     int log;

  420. 

  421.     OPEN_READER(re, gb);

  422.     UPDATE_CACHE(re, gb);

  423.     buf=GET_CACHE(re, gb);

  424. 

  425.     log= 32 - av_log2(buf);

  426. #ifdef TRACE

  427.     print_bin(buf>>(32-log), log);

  428.     av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d lpr @%5d in %s get_level_prefix\n", buf>>(32-log), log, log-1, get_bits_count(gb), __FILE__);

  429. #endif

  430. 

  431.     LAST_SKIP_BITS(re, gb, log);

  432.     CLOSE_READER(re, gb);

  433. 

  434.     return log-1;

  435. }

  436. 

  437. /**

  438.  * decodes a residual block.

  439.  * @param n block index

  440.  * @param scantable scantable

  441.  * @param max_coeff number of coefficients in the block

  442.  * @return <0 if an error occurred

  443.  */

  444. static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff){

  445.     MpegEncContext * const s = &h->s;

  446.     static const int coeff_token_table_index[17]= {0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3};

  447.     int level[16];

  448.     int zeros_left, coeff_token, total_coeff, i, trailing_ones, run_before;

  449. 

  450.     //FIXME put trailing_onex into the context

  451. 

  452.     if(max_coeff <= 8){

  453.         if (max_coeff == 4)

  454.             coeff_token = get_vlc2(gb, chroma_dc_coeff_token_vlc.table, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 1);

  455.         else

  456.             coeff_token = get_vlc2(gb, chroma422_dc_coeff_token_vlc.table, CHROMA422_DC_COEFF_TOKEN_VLC_BITS, 1);

  457.         total_coeff= coeff_token>>2;

  458.     }else{

  459.         if(n >= LUMA_DC_BLOCK_INDEX){

  460.             total_coeff= pred_non_zero_count(h, (n - LUMA_DC_BLOCK_INDEX)*16);

  461.             coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);

  462.             total_coeff= coeff_token>>2;

  463.         }else{

  464.             total_coeff= pred_non_zero_count(h, n);

  465.             coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);

  466.             total_coeff= coeff_token>>2;

  467.         }

  468.     }

  469.     h->non_zero_count_cache[ scan8[n] ]= total_coeff;

  470. 

  471.     //FIXME set last_non_zero?

  472. 

  473.     if(total_coeff==0)

  474.         return 0;

  475.     if(total_coeff > (unsigned)max_coeff) {

  476.         av_log(h->s.avctx, AV_LOG_ERROR, "corrupted macroblock %d %d (total_coeff=%d)\n", s->mb_x, s->mb_y, total_coeff);

  477.         return -1;

  478.     }

  479. 

  480.     trailing_ones= coeff_token&3;

  481.     tprintf(h->s.avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);

  482.     assert(total_coeff<=16);

  483. 

  484.     i = show_bits(gb, 3);

  485.     skip_bits(gb, trailing_ones);

  486.     level[0] = 1-((i&4)>>1);

  487.     level[1] = 1-((i&2)   );

  488.     level[2] = 1-((i&1)<<1);

  489. 

  490.     if(trailing_ones<total_coeff) {

  491.         int mask, prefix;

  492.         int suffix_length = total_coeff > 10 & trailing_ones < 3;

  493.         int bitsi= show_bits(gb, LEVEL_TAB_BITS);

  494.         int level_code= cavlc_level_tab[suffix_length][bitsi][0];

  495. 

  496.         skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);

  497.         if(level_code >= 100){

  498.             prefix= level_code - 100;

  499.             if(prefix == LEVEL_TAB_BITS)

  500.                 prefix += get_level_prefix(gb);

  501. 

  502.             //first coefficient has suffix_length equal to 0 or 1

  503.             if(prefix<14){ //FIXME try to build a large unified VLC table for all this

  504.                 if(suffix_length)

  505.                     level_code= (prefix<<1) + get_bits1(gb); //part

  506.                 else

  507.                     level_code= prefix; //part

  508.             }else if(prefix==14){

  509.                 if(suffix_length)

  510.                     level_code= (prefix<<1) + get_bits1(gb); //part

  511.                 else

  512.                     level_code= prefix + get_bits(gb, 4); //part

  513.             }else{

  514.                 level_code= 30 + get_bits(gb, prefix-3); //part

  515.                 if(prefix>=16){

  516.                     if(prefix > 25+3){

  517.                         av_log(h->s.avctx, AV_LOG_ERROR, "Invalid level prefix\n");

  518.                         return -1;

  519.                     }

  520.                     level_code += (1<<(prefix-3))-4096;

  521.                 }

  522.             }

  523. 

  524.             if(trailing_ones < 3) level_code += 2;

  525. 

  526.             suffix_length = 2;

  527.             mask= -(level_code&1);

  528.             level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask;

  529.         }else{

  530.             level_code += ((level_code>>31)|1) & -(trailing_ones < 3);

  531. 

  532.             suffix_length = 1 + (level_code + 3U > 6U);

  533.             level[trailing_ones]= level_code;

  534.         }

  535. 

  536.         //remaining coefficients have suffix_length > 0

  537.         for(i=trailing_ones+1;i<total_coeff;i++) {

  538.             static const unsigned int suffix_limit[7] = {0,3,6,12,24,48,INT_MAX };

  539.             int bitsi= show_bits(gb, LEVEL_TAB_BITS);

  540.             level_code= cavlc_level_tab[suffix_length][bitsi][0];

  541. 

  542.             skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);

  543.             if(level_code >= 100){

  544.                 prefix= level_code - 100;

  545.                 if(prefix == LEVEL_TAB_BITS){

  546.                     prefix += get_level_prefix(gb);

  547.                 }

  548.                 if(prefix<15){

  549.                     level_code = (prefix<<suffix_length) + get_bits(gb, suffix_length);

  550.                 }else{

  551.                     level_code = (15<<suffix_length) + get_bits(gb, prefix-3);

  552.                     if(prefix>=16)

  553.                         level_code += (1<<(prefix-3))-4096;

  554.                 }

  555.                 mask= -(level_code&1);

  556.                 level_code= (((2+level_code)>>1) ^ mask) - mask;

  557.             }

  558.             level[i]= level_code;

  559.             suffix_length+= suffix_limit[suffix_length] + level_code > 2U*suffix_limit[suffix_length];

  560.         }

  561.     }

  562. 

  563.     if(total_coeff == max_coeff)

  564.         zeros_left=0;

  565.     else{

  566.         if (max_coeff <= 8) {

  567.             if (max_coeff == 4)

  568.                 zeros_left = get_vlc2(gb, (chroma_dc_total_zeros_vlc-1)[total_coeff].table,

  569.                                       CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1);

  570.             else

  571.                 zeros_left = get_vlc2(gb, (chroma422_dc_total_zeros_vlc-1)[total_coeff].table,

  572.                                       CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 1);

  573.         } else {

  574.             zeros_left= get_vlc2(gb, (total_zeros_vlc-1)[ total_coeff ].table, TOTAL_ZEROS_VLC_BITS, 1);

  575.         }

  576.     }

  577. 

  578. #define STORE_BLOCK(type) \

  579.     scantable += zeros_left + total_coeff - 1; \

  580.     if(n >= LUMA_DC_BLOCK_INDEX){ \

  581.         ((type*)block)[*scantable] = level[0]; \

  582.         for(i=1;i<total_coeff && zeros_left > 0;i++) { \

  583.             if(zeros_left < 7) \

  584.                 run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \

  585.             else \

  586.                 run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \

  587.             zeros_left -= run_before; \

  588.             scantable -= 1 + run_before; \

  589.             ((type*)block)[*scantable]= level[i]; \

  590.         } \

  591.         for(;i<total_coeff;i++) { \

  592.             scantable--; \

  593.             ((type*)block)[*scantable]= level[i]; \

  594.         } \

  595.     }else{ \

  596.         ((type*)block)[*scantable] = ((int)(level[0] * qmul[*scantable] + 32))>>6; \

  597.         for(i=1;i<total_coeff && zeros_left > 0;i++) { \

  598.             if(zeros_left < 7) \

  599.                 run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \

  600.             else \

  601.                 run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \

  602.             zeros_left -= run_before; \

  603.             scantable -= 1 + run_before; \

  604.             ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \

  605.         } \

  606.         for(;i<total_coeff;i++) { \

  607.             scantable--; \

  608.             ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \

  609.         } \

  610.     }

  611. 

  612.     if (h->pixel_shift) {

  613.         STORE_BLOCK(int32_t)

  614.     } else {

  615.         STORE_BLOCK(int16_t)

  616.     }

  617. 

  618.     if(zeros_left<0){

  619.         av_log(h->s.avctx, AV_LOG_ERROR, "negative number of zero coeffs at %d %d\n", s->mb_x, s->mb_y);

  620.         return -1;

  621.     }

  622. 

  623.     return 0;

  624. }

  625. 

  626. static av_always_inline int decode_luma_residual(H264Context *h, GetBitContext *gb, const uint8_t *scan, const uint8_t *scan8x8, int pixel_shift, int mb_type, int cbp, int p){

  627.     int i4x4, i8x8;

  628.     MpegEncContext * const s = &h->s;

  629.     int qscale = p == 0 ? s->qscale : h->chroma_qp[p-1];

  630.     if(IS_INTRA16x16(mb_type)){

  631.         AV_ZERO128(h->mb_luma_dc[p]+0);

  632.         AV_ZERO128(h->mb_luma_dc[p]+8);

  633.         AV_ZERO128(h->mb_luma_dc[p]+16);

  634.         AV_ZERO128(h->mb_luma_dc[p]+24);

  635.         if( decode_residual(h, h->intra_gb_ptr, h->mb_luma_dc[p], LUMA_DC_BLOCK_INDEX+p, scan, NULL, 16) < 0){

  636.             return -1; //FIXME continue if partitioned and other return -1 too

  637.         }

  638. 

  639.         assert((cbp&15) == 0 || (cbp&15) == 15);

  640. 

  641.         if(cbp&15){

  642.             for(i8x8=0; i8x8<4; i8x8++){

  643.                 for(i4x4=0; i4x4<4; i4x4++){

  644.                     const int index= i4x4 + 4*i8x8 + p*16;

  645.                     if( decode_residual(h, h->intra_gb_ptr, h->mb + (16*index << pixel_shift),

  646.                         index, scan + 1, h->dequant4_coeff[p][qscale], 15) < 0 ){

  647.                         return -1;

  648.                     }

  649.                 }

  650.             }

  651.             return 0xf;

  652.         }else{

  653.             fill_rectangle(&h->non_zero_count_cache[scan8[p*16]], 4, 4, 8, 0, 1);

  654.             return 0;

  655.         }

  656.     }else{

  657.         int cqm = (IS_INTRA( mb_type ) ? 0:3)+p;

  658.         /* For CAVLC 4:4:4, we need to keep track of the luma 8x8 CBP for deblocking nnz purposes. */

  659.         int new_cbp = 0;

  660.         for(i8x8=0; i8x8<4; i8x8++){

  661.             if(cbp & (1<<i8x8)){

  662.                 if(IS_8x8DCT(mb_type)){

  663.                     DCTELEM *buf = &h->mb[64*i8x8+256*p << pixel_shift];

  664.                     uint8_t *nnz;

  665.                     for(i4x4=0; i4x4<4; i4x4++){

  666.                         const int index= i4x4 + 4*i8x8 + p*16;

  667.                         if( decode_residual(h, gb, buf, index, scan8x8+16*i4x4,

  668.                                             h->dequant8_coeff[cqm][qscale], 16) < 0 )

  669.                             return -1;

  670.                     }

  671.                     nnz= &h->non_zero_count_cache[ scan8[4*i8x8+p*16] ];

  672.                     nnz[0] += nnz[1] + nnz[8] + nnz[9];

  673.                     new_cbp |= !!nnz[0] << i8x8;

  674.                 }else{

  675.                     for(i4x4=0; i4x4<4; i4x4++){

  676.                         const int index= i4x4 + 4*i8x8 + p*16;

  677.                         if( decode_residual(h, gb, h->mb + (16*index << pixel_shift), index,

  678.                                             scan, h->dequant4_coeff[cqm][qscale], 16) < 0 ){

  679.                             return -1;

  680.                         }

  681.                         new_cbp |= h->non_zero_count_cache[ scan8[index] ] << i8x8;

  682.                     }

  683.                 }

  684.             }else{

  685.                 uint8_t * const nnz= &h->non_zero_count_cache[ scan8[4*i8x8+p*16] ];

  686.                 nnz[0] = nnz[1] = nnz[8] = nnz[9] = 0;

  687.             }

  688.         }

  689.         return new_cbp;

  690.     }

  691. }

  692. 

  693. int ff_h264_decode_mb_cavlc(H264Context *h){

  694.     MpegEncContext * const s = &h->s;

  695.     int mb_xy;

  696.     int partition_count;

  697.     unsigned int mb_type, cbp;

  698.     int dct8x8_allowed= h->pps.transform_8x8_mode;

  699.     int decode_chroma = h->sps.chroma_format_idc == 1 || h->sps.chroma_format_idc == 2;

  700.     const int pixel_shift = h->pixel_shift;

  701. 

  702.     mb_xy = h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  703. 

  704.     tprintf(s->avctx, "pic:%d mb:%d/%d\n", h->frame_num, s->mb_x, s->mb_y);

  705.     cbp = 0; /* avoid warning. FIXME: find a solution without slowing

  706.                 down the code */

  707.     if(h->slice_type_nos != AV_PICTURE_TYPE_I){

  708.         if(s->mb_skip_run==-1)

  709.             s->mb_skip_run= get_ue_golomb(&s->gb);

  710. 

  711.         if (s->mb_skip_run--) {

  712.             if(FRAME_MBAFF && (s->mb_y&1) == 0){

  713.                 if(s->mb_skip_run==0)

  714.                     h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&s->gb);

  715.             }

  716.             decode_mb_skip(h);

  717.             return 0;

  718.         }

  719.     }

  720.     if(FRAME_MBAFF){

  721.         if( (s->mb_y&1) == 0 )

  722.             h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&s->gb);

  723.     }

  724. 

  725.     h->prev_mb_skipped= 0;

  726. 

  727.     mb_type= get_ue_golomb(&s->gb);

  728.     if(h->slice_type_nos == AV_PICTURE_TYPE_B){

  729.         if(mb_type < 23){

  730.             partition_count= b_mb_type_info[mb_type].partition_count;

  731.             mb_type=         b_mb_type_info[mb_type].type;

  732.         }else{

  733.             mb_type -= 23;

  734.             goto decode_intra_mb;

  735.         }

  736.     }else if(h->slice_type_nos == AV_PICTURE_TYPE_P){

  737.         if(mb_type < 5){

  738.             partition_count= p_mb_type_info[mb_type].partition_count;

  739.             mb_type=         p_mb_type_info[mb_type].type;

  740.         }else{

  741.             mb_type -= 5;

  742.             goto decode_intra_mb;

  743.         }

  744.     }else{

  745.        assert(h->slice_type_nos == AV_PICTURE_TYPE_I);

  746.         if(h->slice_type == AV_PICTURE_TYPE_SI && mb_type)

  747.             mb_type--;

  748. decode_intra_mb:

  749.         if(mb_type > 25){

  750.             av_log(h->s.avctx, AV_LOG_ERROR, "mb_type %d in %c slice too large at %d %d\n", mb_type, av_get_picture_type_char(h->slice_type), s->mb_x, s->mb_y);

  751.             return -1;

  752.         }

  753.         partition_count=0;

  754.         cbp= i_mb_type_info[mb_type].cbp;

  755.         h->intra16x16_pred_mode= i_mb_type_info[mb_type].pred_mode;

  756.         mb_type= i_mb_type_info[mb_type].type;

  757.     }

  758. 

  759.     if(MB_FIELD)

  760.         mb_type |= MB_TYPE_INTERLACED;

  761. 

  762.     h->slice_table[ mb_xy ]= h->slice_num;

  763. 

  764.     if(IS_INTRA_PCM(mb_type)){

  765.         unsigned int x;

  766.         static const uint16_t mb_sizes[4] = {256,384,512,768};

  767.         const int mb_size = mb_sizes[h->sps.chroma_format_idc]*h->sps.bit_depth_luma >> 3;

  768. 

  769.         // We assume these blocks are very rare so we do not optimize it.

  770.         align_get_bits(&s->gb);

  771. 

  772.         // The pixels are stored in the same order as levels in h->mb array.

  773.         for(x=0; x < mb_size; x++){

  774.             ((uint8_t*)h->mb)[x]= get_bits(&s->gb, 8);

  775.         }

  776. 

  777.         // In deblocking, the quantizer is 0

  778.         s->current_picture.f.qscale_table[mb_xy] = 0;

  779.         // All coeffs are present

  780.         memset(h->non_zero_count[mb_xy], 16, 48);

  781. 

  782.         s->current_picture.f.mb_type[mb_xy] = mb_type;

  783.         return 0;

  784.     }

  785. 

  786.     if(MB_MBAFF){

  787.         h->ref_count[0] <<= 1;

  788.         h->ref_count[1] <<= 1;

  789.     }

  790. 

  791.     fill_decode_neighbors(h, mb_type);

  792.     fill_decode_caches(h, mb_type);

  793. 

  794.     //mb_pred

  795.     if(IS_INTRA(mb_type)){

  796.         int pred_mode;

  797. //            init_top_left_availability(h);

  798.         if(IS_INTRA4x4(mb_type)){

  799.             int i;

  800.             int di = 1;

  801.             if(dct8x8_allowed && get_bits1(&s->gb)){

  802.                 mb_type |= MB_TYPE_8x8DCT;

  803.                 di = 4;

  804.             }

  805. 

  806. //                fill_intra4x4_pred_table(h);

  807.             for(i=0; i<16; i+=di){

  808.                 int mode= pred_intra_mode(h, i);

  809. 

  810.                 if(!get_bits1(&s->gb)){

  811.                     const int rem_mode= get_bits(&s->gb, 3);

  812.                     mode = rem_mode + (rem_mode >= mode);

  813.                 }

  814. 

  815.                 if(di==4)

  816.                     fill_rectangle( &h->intra4x4_pred_mode_cache[ scan8[i] ], 2, 2, 8, mode, 1 );

  817.                 else

  818.                     h->intra4x4_pred_mode_cache[ scan8[i] ] = mode;

  819.             }

  820.             write_back_intra_pred_mode(h);

  821.             if( ff_h264_check_intra4x4_pred_mode(h) < 0)

  822.                 return -1;

  823.         }else{

  824.             h->intra16x16_pred_mode= ff_h264_check_intra16x16_pred_mode(h, h->intra16x16_pred_mode);

  825.             if(h->intra16x16_pred_mode < 0)

  826.                 return -1;

  827.         }

  828.         if(decode_chroma){

  829.             pred_mode= ff_h264_check_intra_chroma_pred_mode(h, get_ue_golomb_31(&s->gb));

  830.             if(pred_mode < 0)

  831.                 return -1;

  832.             h->chroma_pred_mode= pred_mode;

  833.         } else {

  834.             h->chroma_pred_mode = DC_128_PRED8x8;

  835.         }

  836.     }else if(partition_count==4){

  837.         int i, j, sub_partition_count[4], list, ref[2][4];

  838. 

  839.         if(h->slice_type_nos == AV_PICTURE_TYPE_B){

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

  841.                 h->sub_mb_type[i]= get_ue_golomb_31(&s->gb);

  842.                 if(h->sub_mb_type[i] >=13){

  843.                     av_log(h->s.avctx, AV_LOG_ERROR, "B sub_mb_type %u out of range at %d %d\n", h->sub_mb_type[i], s->mb_x, s->mb_y);

  844.                     return -1;

  845.                 }

  846.                 sub_partition_count[i]= b_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;

  847.                 h->sub_mb_type[i]=      b_sub_mb_type_info[ h->sub_mb_type[i] ].type;

  848.             }

  849.             if( IS_DIRECT(h->sub_mb_type[0]|h->sub_mb_type[1]|h->sub_mb_type[2]|h->sub_mb_type[3])) {

  850.                 ff_h264_pred_direct_motion(h, &mb_type);

  851.                 h->ref_cache[0][scan8[4]] =

  852.                 h->ref_cache[1][scan8[4]] =

  853.                 h->ref_cache[0][scan8[12]] =

  854.                 h->ref_cache[1][scan8[12]] = PART_NOT_AVAILABLE;

  855.             }

  856.         }else{

  857.             assert(h->slice_type_nos == AV_PICTURE_TYPE_P); //FIXME SP correct ?

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

  859.                 h->sub_mb_type[i]= get_ue_golomb_31(&s->gb);

  860.                 if(h->sub_mb_type[i] >=4){

  861.                     av_log(h->s.avctx, AV_LOG_ERROR, "P sub_mb_type %u out of range at %d %d\n", h->sub_mb_type[i], s->mb_x, s->mb_y);

  862.                     return -1;

  863.                 }

  864.                 sub_partition_count[i]= p_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;

  865.                 h->sub_mb_type[i]=      p_sub_mb_type_info[ h->sub_mb_type[i] ].type;

  866.             }

  867.         }

  868. 

  869.         for(list=0; list<h->list_count; list++){

  870.             int ref_count= IS_REF0(mb_type) ? 1 : h->ref_count[list];

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

  872.                 if(IS_DIRECT(h->sub_mb_type[i])) continue;

  873.                 if(IS_DIR(h->sub_mb_type[i], 0, list)){

  874.                     unsigned int tmp;

  875.                     if(ref_count == 1){

  876.                         tmp= 0;

  877.                     }else if(ref_count == 2){

  878.                         tmp= get_bits1(&s->gb)^1;

  879.                     }else{

  880.                         tmp= get_ue_golomb_31(&s->gb);

  881.                         if(tmp>=ref_count){

  882.                             av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", tmp);

  883.                             return -1;

  884.                         }

  885.                     }

  886.                     ref[list][i]= tmp;

  887.                 }else{

  888.                  //FIXME

  889.                     ref[list][i] = -1;

  890.                 }

  891.             }

  892.         }

  893. 

  894.         if(dct8x8_allowed)

  895.             dct8x8_allowed = get_dct8x8_allowed(h);

  896. 

  897.         for(list=0; list<h->list_count; list++){

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

  899.                 if(IS_DIRECT(h->sub_mb_type[i])) {

  900.                     h->ref_cache[list][ scan8[4*i] ] = h->ref_cache[list][ scan8[4*i]+1 ];

  901.                     continue;

  902.                 }

  903.                 h->ref_cache[list][ scan8[4*i]   ]=h->ref_cache[list][ scan8[4*i]+1 ]=

  904.                 h->ref_cache[list][ scan8[4*i]+8 ]=h->ref_cache[list][ scan8[4*i]+9 ]= ref[list][i];

  905. 

  906.                 if(IS_DIR(h->sub_mb_type[i], 0, list)){

  907.                     const int sub_mb_type= h->sub_mb_type[i];

  908.                     const int block_width= (sub_mb_type & (MB_TYPE_16x16|MB_TYPE_16x8)) ? 2 : 1;

  909.                     for(j=0; j<sub_partition_count[i]; j++){

  910.                         int mx, my;

  911.                         const int index= 4*i + block_width*j;

  912.                         int16_t (* mv_cache)[2]= &h->mv_cache[list][ scan8[index] ];

  913.                         pred_motion(h, index, block_width, list, h->ref_cache[list][ scan8[index] ], &mx, &my);

  914.                         mx += get_se_golomb(&s->gb);

  915.                         my += get_se_golomb(&s->gb);

  916.                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);

  917. 

  918.                         if(IS_SUB_8X8(sub_mb_type)){

  919.                             mv_cache[ 1 ][0]=

  920.                             mv_cache[ 8 ][0]= mv_cache[ 9 ][0]= mx;

  921.                             mv_cache[ 1 ][1]=

  922.                             mv_cache[ 8 ][1]= mv_cache[ 9 ][1]= my;

  923.                         }else if(IS_SUB_8X4(sub_mb_type)){

  924.                             mv_cache[ 1 ][0]= mx;

  925.                             mv_cache[ 1 ][1]= my;

  926.                         }else if(IS_SUB_4X8(sub_mb_type)){

  927.                             mv_cache[ 8 ][0]= mx;

  928.                             mv_cache[ 8 ][1]= my;

  929.                         }

  930.                         mv_cache[ 0 ][0]= mx;

  931.                         mv_cache[ 0 ][1]= my;

  932.                     }

  933.                 }else{

  934.                     uint32_t *p= (uint32_t *)&h->mv_cache[list][ scan8[4*i] ][0];

  935.                     p[0] = p[1]=

  936.                     p[8] = p[9]= 0;

  937.                 }

  938.             }

  939.         }

  940.     }else if(IS_DIRECT(mb_type)){

  941.         ff_h264_pred_direct_motion(h, &mb_type);

  942.         dct8x8_allowed &= h->sps.direct_8x8_inference_flag;

  943.     }else{

  944.         int list, mx, my, i;

  945.          //FIXME we should set ref_idx_l? to 0 if we use that later ...

  946.         if(IS_16X16(mb_type)){

  947.             for(list=0; list<h->list_count; list++){

  948.                     unsigned int val;

  949.                     if(IS_DIR(mb_type, 0, list)){

  950.                         if(h->ref_count[list]==1){

  951.                             val= 0;

  952.                         }else if(h->ref_count[list]==2){

  953.                             val= get_bits1(&s->gb)^1;

  954.                         }else{

  955.                             val= get_ue_golomb_31(&s->gb);

  956.                             if(val >= h->ref_count[list]){

  957.                                 av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

  958.                                 return -1;

  959.                             }

  960.                         }

  961.                     fill_rectangle(&h->ref_cache[list][ scan8[0] ], 4, 4, 8, val, 1);

  962.                     }

  963.             }

  964.             for(list=0; list<h->list_count; list++){

  965.                 if(IS_DIR(mb_type, 0, list)){

  966.                     pred_motion(h, 0, 4, list, h->ref_cache[list][ scan8[0] ], &mx, &my);

  967.                     mx += get_se_golomb(&s->gb);

  968.                     my += get_se_golomb(&s->gb);

  969.                     tprintf(s->avctx, "final mv:%d %d\n", mx, my);

  970. 

  971.                     fill_rectangle(h->mv_cache[list][ scan8[0] ], 4, 4, 8, pack16to32(mx,my), 4);

  972.                 }

  973.             }

  974.         }

  975.         else if(IS_16X8(mb_type)){

  976.             for(list=0; list<h->list_count; list++){

  977.                     for(i=0; i<2; i++){

  978.                         unsigned int val;

  979.                         if(IS_DIR(mb_type, i, list)){

  980.                             if(h->ref_count[list] == 1){

  981.                                 val= 0;

  982.                             }else if(h->ref_count[list] == 2){

  983.                                 val= get_bits1(&s->gb)^1;

  984.                             }else{

  985.                                 val= get_ue_golomb_31(&s->gb);

  986.                                 if(val >= h->ref_count[list]){

  987.                                     av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

  988.                                     return -1;

  989.                                 }

  990.                             }

  991.                         }else

  992.                             val= LIST_NOT_USED&0xFF;

  993.                         fill_rectangle(&h->ref_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 1);

  994.                     }

  995.             }

  996.             for(list=0; list<h->list_count; list++){

  997.                 for(i=0; i<2; i++){

  998.                     unsigned int val;

  999.                     if(IS_DIR(mb_type, i, list)){

  1000.                         pred_16x8_motion(h, 8*i, list, h->ref_cache[list][scan8[0] + 16*i], &mx, &my);

  1001.                         mx += get_se_golomb(&s->gb);

  1002.                         my += get_se_golomb(&s->gb);

  1003.                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);

  1004. 

  1005.                         val= pack16to32(mx,my);

  1006.                     }else

  1007.                         val=0;

  1008.                     fill_rectangle(h->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);

  1009.                 }

  1010.             }

  1011.         }else{

  1012.             assert(IS_8X16(mb_type));

  1013.             for(list=0; list<h->list_count; list++){

  1014.                     for(i=0; i<2; i++){

  1015.                         unsigned int val;

  1016.                         if(IS_DIR(mb_type, i, list)){ //FIXME optimize

  1017.                             if(h->ref_count[list]==1){

  1018.                                 val= 0;

  1019.                             }else if(h->ref_count[list]==2){

  1020.                                 val= get_bits1(&s->gb)^1;

  1021.                             }else{

  1022.                                 val= get_ue_golomb_31(&s->gb);

  1023.                                 if(val >= h->ref_count[list]){

  1024.                                     av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

  1025.                                     return -1;

  1026.                                 }

  1027.                             }

  1028.                         }else

  1029.                             val= LIST_NOT_USED&0xFF;

  1030.                         fill_rectangle(&h->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);

  1031.                     }

  1032.             }

  1033.             for(list=0; list<h->list_count; list++){

  1034.                 for(i=0; i<2; i++){

  1035.                     unsigned int val;

  1036.                     if(IS_DIR(mb_type, i, list)){

  1037.                         pred_8x16_motion(h, i*4, list, h->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);

  1038.                         mx += get_se_golomb(&s->gb);

  1039.                         my += get_se_golomb(&s->gb);

  1040.                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);

  1041. 

  1042.                         val= pack16to32(mx,my);

  1043.                     }else

  1044.                         val=0;

  1045.                     fill_rectangle(h->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);

  1046.                 }

  1047.             }

  1048.         }

  1049.     }

  1050. 

  1051.     if(IS_INTER(mb_type))

  1052.         write_back_motion(h, mb_type);

  1053. 

  1054.     if(!IS_INTRA16x16(mb_type)){

  1055.         cbp= get_ue_golomb(&s->gb);

  1056. 

  1057.         if(decode_chroma){

  1058.             if(cbp > 47){

  1059.                 av_log(h->s.avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, s->mb_x, s->mb_y);

  1060.                 return -1;

  1061.             }

  1062.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp[cbp];

  1063.             else                     cbp= golomb_to_inter_cbp   [cbp];

  1064.         }else{

  1065.             if(cbp > 15){

  1066.                 av_log(h->s.avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, s->mb_x, s->mb_y);

  1067.                 return -1;

  1068.             }

  1069.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];

  1070.             else                     cbp= golomb_to_inter_cbp_gray[cbp];

  1071.         }

  1072.     }

  1073. 

  1074.     if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){

  1075.         mb_type |= MB_TYPE_8x8DCT*get_bits1(&s->gb);

  1076.     }

  1077.     h->cbp=

  1078.     h->cbp_table[mb_xy]= cbp;

  1079.     s->current_picture.f.mb_type[mb_xy] = mb_type;

  1080. 

  1081.     if(cbp || IS_INTRA16x16(mb_type)){

  1082.         int i4x4, i8x8, chroma_idx;

  1083.         int dquant;

  1084.         int ret;

  1085.         GetBitContext *gb= IS_INTRA(mb_type) ? h->intra_gb_ptr : h->inter_gb_ptr;

  1086.         const uint8_t *scan, *scan8x8;

  1087.         const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);

  1088. 

  1089.         if(IS_INTERLACED(mb_type)){

  1090.             scan8x8= s->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;

  1091.             scan= s->qscale ? h->field_scan : h->field_scan_q0;

  1092.         }else{

  1093.             scan8x8= s->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;

  1094.             scan= s->qscale ? h->zigzag_scan : h->zigzag_scan_q0;

  1095.         }

  1096. 

  1097.         dquant= get_se_golomb(&s->gb);

  1098. 

  1099.         s->qscale += dquant;

  1100. 

  1101.         if(((unsigned)s->qscale) > max_qp){

  1102.             if(s->qscale<0) s->qscale+= max_qp+1;

  1103.             else            s->qscale-= max_qp+1;

  1104.             if(((unsigned)s->qscale) > max_qp){

  1105.                 av_log(h->s.avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, s->mb_x, s->mb_y);

  1106.                 return -1;

  1107.             }

  1108.         }

  1109. 

  1110.         h->chroma_qp[0]= get_chroma_qp(h, 0, s->qscale);

  1111.         h->chroma_qp[1]= get_chroma_qp(h, 1, s->qscale);

  1112. 

  1113.         if( (ret = decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 0)) < 0 ){

  1114.             return -1;

  1115.         }

  1116.         h->cbp_table[mb_xy] |= ret << 12;

  1117.         if(CHROMA444){

  1118.             if( decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 1) < 0 ){

  1119.                 return -1;

  1120.             }

  1121.             if( decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 2) < 0 ){

  1122.                 return -1;

  1123.             }

  1124.         } else {

  1125.             const int num_c8x8 = h->sps.chroma_format_idc;

  1126. 

  1127.             if(cbp&0x30){

  1128.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++)

  1129.                     if (decode_residual(h, gb, h->mb + ((256 + 16*16*chroma_idx) << pixel_shift),

  1130.                                         CHROMA_DC_BLOCK_INDEX+chroma_idx,

  1131.                                         CHROMA422 ? chroma422_dc_scan : chroma_dc_scan,

  1132.                                         NULL, 4*num_c8x8) < 0) {

  1133.                         return -1;

  1134.                     }

  1135.             }

  1136. 

  1137.             if(cbp&0x20){

  1138.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++){

  1139.                     const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][h->chroma_qp[chroma_idx]];

  1140.                     DCTELEM *mb = h->mb + (16*(16 + 16*chroma_idx) << pixel_shift);

  1141.                     for (i8x8=0; i8x8<num_c8x8; i8x8++) {

  1142.                         for (i4x4=0; i4x4<4; i4x4++) {

  1143.                             const int index= 16 + 16*chroma_idx + 8*i8x8 + i4x4;

  1144.                             if (decode_residual(h, gb, mb, index, scan + 1, qmul, 15) < 0)

  1145.                                 return -1;

  1146.                             mb += 16<<pixel_shift;

  1147.                         }

  1148.                     }

  1149.                 }

  1150.             }else{

  1151.                 fill_rectangle(&h->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1152.                 fill_rectangle(&h->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1153.             }

  1154.         }

  1155.     }else{

  1156.         fill_rectangle(&h->non_zero_count_cache[scan8[ 0]], 4, 4, 8, 0, 1);

  1157.         fill_rectangle(&h->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1158.         fill_rectangle(&h->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1159.     }

  1160.     s->current_picture.f.qscale_table[mb_xy] = s->qscale;

  1161.     write_back_non_zero_count(h);

  1162. 

  1163.     if(MB_MBAFF){

  1164.         h->ref_count[0] >>= 1;

  1165.         h->ref_count[1] >>= 1;

  1166.     }

  1167. 

  1168.     return 0;

  1169. }