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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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(h) 0

  29. 

  30. #include "internal.h"

  31. #include "avcodec.h"

  32. #include "h264.h"

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

  34. #include "h264_mvpred.h"

  35. #include "golomb.h"

  36. #include "mpegutils.h"

  37. 

  38. #include <assert.h>

  39. 

  40. static const uint8_t golomb_to_inter_cbp_gray[16]={

  41.  0, 1, 2, 4, 8, 3, 5,10,12,15, 7,11,13,14, 6, 9,

  42. };

  43. 

  44. static const uint8_t golomb_to_intra4x4_cbp_gray[16]={

  45. 15, 0, 7,11,13,14, 3, 5,10,12, 1, 2, 4, 8, 6, 9,

  46. };

  47. 

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

  49.  2, 0, 0, 0,

  50.  6, 1, 0, 0,

  51.  6, 6, 3, 0,

  52.  6, 7, 7, 6,

  53.  6, 8, 8, 7,

  54. };

  55. 

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

  57.  1, 0, 0, 0,

  58.  7, 1, 0, 0,

  59.  4, 6, 1, 0,

  60.  3, 3, 2, 5,

  61.  2, 3, 2, 0,

  62. };

  63. 

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

  65.   1,  0,  0,  0,

  66.   7,  2,  0,  0,

  67.   7,  7,  3,  0,

  68.   9,  7,  7,  5,

  69.   9,  9,  7,  6,

  70.  10, 10,  9,  7,

  71.  11, 11, 10,  7,

  72.  12, 12, 11, 10,

  73.  13, 12, 12, 11,

  74. };

  75. 

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

  77.   1,   0,  0, 0,

  78.  15,   1,  0, 0,

  79.  14,  13,  1, 0,

  80.   7,  12, 11, 1,

  81.   6,   5, 10, 1,

  82.   7,   6,  4, 9,

  83.   7,   6,  5, 8,

  84.   7,   6,  5, 4,

  85.   7,   5,  4, 4,

  86. };

  87. 

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

  89. {

  90.      1, 0, 0, 0,

  91.      6, 2, 0, 0,     8, 6, 3, 0,     9, 8, 7, 5,    10, 9, 8, 6,

  92.     11,10, 9, 7,    13,11,10, 8,    13,13,11, 9,    13,13,13,10,

  93.     14,14,13,11,    14,14,14,13,    15,15,14,14,    15,15,15,14,

  94.     16,15,15,15,    16,16,16,15,    16,16,16,16,    16,16,16,16,

  95. },

  96. {

  97.      2, 0, 0, 0,

  98.      6, 2, 0, 0,     6, 5, 3, 0,     7, 6, 6, 4,     8, 6, 6, 4,

  99.      8, 7, 7, 5,     9, 8, 8, 6,    11, 9, 9, 6,    11,11,11, 7,

  100.     12,11,11, 9,    12,12,12,11,    12,12,12,11,    13,13,13,12,

  101.     13,13,13,13,    13,14,13,13,    14,14,14,13,    14,14,14,14,

  102. },

  103. {

  104.      4, 0, 0, 0,

  105.      6, 4, 0, 0,     6, 5, 4, 0,     6, 5, 5, 4,     7, 5, 5, 4,

  106.      7, 5, 5, 4,     7, 6, 6, 4,     7, 6, 6, 4,     8, 7, 7, 5,

  107.      8, 8, 7, 6,     9, 8, 8, 7,     9, 9, 8, 8,     9, 9, 9, 8,

  108.     10, 9, 9, 9,    10,10,10,10,    10,10,10,10,    10,10,10,10,

  109. },

  110. {

  111.      6, 0, 0, 0,

  112.      6, 6, 0, 0,     6, 6, 6, 0,     6, 6, 6, 6,     6, 6, 6, 6,

  113.      6, 6, 6, 6,     6, 6, 6, 6,     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. }

  117. };

  118. 

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

  120. {

  121.      1, 0, 0, 0,

  122.      5, 1, 0, 0,     7, 4, 1, 0,     7, 6, 5, 3,     7, 6, 5, 3,

  123.      7, 6, 5, 4,    15, 6, 5, 4,    11,14, 5, 4,     8,10,13, 4,

  124.     15,14, 9, 4,    11,10,13,12,    15,14, 9,12,    11,10,13, 8,

  125.     15, 1, 9,12,    11,14,13, 8,     7,10, 9,12,     4, 6, 5, 8,

  126. },

  127. {

  128.      3, 0, 0, 0,

  129.     11, 2, 0, 0,     7, 7, 3, 0,     7,10, 9, 5,     7, 6, 5, 4,

  130.      4, 6, 5, 6,     7, 6, 5, 8,    15, 6, 5, 4,    11,14,13, 4,

  131.     15,10, 9, 4,    11,14,13,12,     8,10, 9, 8,    15,14,13,12,

  132.     11,10, 9,12,     7,11, 6, 8,     9, 8,10, 1,     7, 6, 5, 4,

  133. },

  134. {

  135.     15, 0, 0, 0,

  136.     15,14, 0, 0,    11,15,13, 0,     8,12,14,12,    15,10,11,11,

  137.     11, 8, 9,10,     9,14,13, 9,     8,10, 9, 8,    15,14,13,13,

  138.     11,14,10,12,    15,10,13,12,    11,14, 9,12,     8,10,13, 8,

  139.     13, 7, 9,12,     9,12,11,10,     5, 8, 7, 6,     1, 4, 3, 2,

  140. },

  141. {

  142.      3, 0, 0, 0,

  143.      0, 1, 0, 0,     4, 5, 6, 0,     8, 9,10,11,    12,13,14,15,

  144.     16,17,18,19,    20,21,22,23,    24,25,26,27,    28,29,30,31,

  145.     32,33,34,35,    36,37,38,39,    40,41,42,43,    44,45,46,47,

  146.     48,49,50,51,    52,53,54,55,    56,57,58,59,    60,61,62,63,

  147. }

  148. };

  149. 

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

  151.     {1,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9},

  152.     {3,3,3,3,3,4,4,4,4,5,5,6,6,6,6},

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

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

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

  156.     {6,5,3,3,3,3,3,3,4,3,6},

  157.     {6,5,3,3,3,2,3,4,3,6},

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

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

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

  161.     {4,4,3,3,1,3},

  162.     {4,4,2,1,3},

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

  164.     {2,2,1},

  165.     {1,1},

  166. };

  167. 

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

  169.     {1,3,2,3,2,3,2,3,2,3,2,3,2,3,2,1},

  170.     {7,6,5,4,3,5,4,3,2,3,2,3,2,1,0},

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

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

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

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

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

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

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

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

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

  180.     {0,1,1,1,1},

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

  182.     {0,1,1},

  183.     {0,1},

  184. };

  185. 

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

  187.     { 1, 2, 3, 3,},

  188.     { 1, 2, 2, 0,},

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

  190. };

  191. 

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

  193.     { 1, 1, 1, 0,},

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

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

  196. };

  197. 

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

  199.     { 1, 3, 3, 4, 4, 4, 5, 5 },

  200.     { 3, 2, 3, 3, 3, 3, 3 },

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

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

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

  204.     { 2, 2, 1 },

  205.     { 1, 1 },

  206. };

  207. 

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

  209.     { 1, 2, 3, 2, 3, 1, 1, 0 },

  210.     { 0, 1, 1, 4, 5, 6, 7 },

  211.     { 0, 1, 1, 2, 6, 7 },

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

  213.     { 0, 1, 2, 3 },

  214.     { 0, 1, 1 },

  215.     { 0, 1 },

  216. };

  217. 

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

  219.     {1,1},

  220.     {1,2,2},

  221.     {2,2,2,2},

  222.     {2,2,2,3,3},

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

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

  225.     {3,3,3,3,3,3,3,4,5,6,7,8,9,10,11},

  226. };

  227. 

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

  229.     {1,0},

  230.     {1,1,0},

  231.     {3,2,1,0},

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

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

  234.     {3,0,1,3,2,5,4},

  235.     {7,6,5,4,3,2,1,1,1,1,1,1,1,1,1},

  236. };

  237. 

  238. static VLC coeff_token_vlc[4];

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

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

  241. 

  242. static VLC chroma_dc_coeff_token_vlc;

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

  244. static const int chroma_dc_coeff_token_vlc_table_size = 256;

  245. 

  246. static VLC chroma422_dc_coeff_token_vlc;

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

  248. static const int chroma422_dc_coeff_token_vlc_table_size = 8192;

  249. 

  250. static VLC total_zeros_vlc[15];

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

  252. static const int total_zeros_vlc_tables_size = 512;

  253. 

  254. static VLC chroma_dc_total_zeros_vlc[3];

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

  256. static const int chroma_dc_total_zeros_vlc_tables_size = 8;

  257. 

  258. static VLC chroma422_dc_total_zeros_vlc[7];

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

  260. static const int chroma422_dc_total_zeros_vlc_tables_size = 32;

  261. 

  262. static VLC run_vlc[6];

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

  264. static const int run_vlc_tables_size = 8;

  265. 

  266. static VLC run7_vlc;

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

  268. static const int run7_vlc_table_size = 96;

  269. 

  270. #define LEVEL_TAB_BITS 8

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

  272. 

  273. #define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8

  274. #define CHROMA422_DC_COEFF_TOKEN_VLC_BITS 13

  275. #define COEFF_TOKEN_VLC_BITS           8

  276. #define TOTAL_ZEROS_VLC_BITS           9

  277. #define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3

  278. #define CHROMA422_DC_TOTAL_ZEROS_VLC_BITS 5

  279. #define RUN_VLC_BITS                   3

  280. #define RUN7_VLC_BITS                  6

  281. 

  282. /**

  283.  * Get the predicted number of non-zero coefficients.

  284.  * @param n block index

  285.  */

  286. static inline int pred_non_zero_count(const H264Context *h, H264SliceContext *sl, int n)

  287. {

  288.     const int index8= scan8[n];

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

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

  291.     int i= left + top;

  292. 

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

  294. 

  295.     ff_tlog(h->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;

  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. 

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

  309.                 int level_code = (prefix << suffix_length) +

  310.                     (i >> (av_log2(i) - suffix_length)) - (1 << suffix_length);

  311.                 int mask = -(level_code&1);

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

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

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

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

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

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

  318.             }else{

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

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

  321.             }

  322.         }

  323.     }

  324. }

  325. 

  326. av_cold void ff_h264_decode_init_vlc(void){

  327.     static int done = 0;

  328. 

  329.     if (!done) {

  330.         int i;

  331.         int offset;

  332.         done = 1;

  333. 

  334.         chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;

  335.         chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;

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

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

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

  339.                  INIT_VLC_USE_NEW_STATIC);

  340. 

  341.         chroma422_dc_coeff_token_vlc.table = chroma422_dc_coeff_token_vlc_table;

  342.         chroma422_dc_coeff_token_vlc.table_allocated = chroma422_dc_coeff_token_vlc_table_size;

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

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

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

  346.                  INIT_VLC_USE_NEW_STATIC);

  347. 

  348.         offset = 0;

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

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

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

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

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

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

  355.                      INIT_VLC_USE_NEW_STATIC);

  356.             offset += coeff_token_vlc_tables_size[i];

  357.         }

  358.         /*

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

  360.          * the packed static coeff_token_vlc table sizes

  361.          * were initialized correctly.

  362.          */

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

  364. 

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

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

  367.             chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;

  368.             init_vlc(&chroma_dc_total_zeros_vlc[i],

  369.                      CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,

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

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

  372.                      INIT_VLC_USE_NEW_STATIC);

  373.         }

  374. 

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

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

  377.             chroma422_dc_total_zeros_vlc[i].table_allocated = chroma422_dc_total_zeros_vlc_tables_size;

  378.             init_vlc(&chroma422_dc_total_zeros_vlc[i],

  379.                      CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 8,

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

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

  382.                      INIT_VLC_USE_NEW_STATIC);

  383.         }

  384. 

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

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

  387.             total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;

  388.             init_vlc(&total_zeros_vlc[i],

  389.                      TOTAL_ZEROS_VLC_BITS, 16,

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

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

  392.                      INIT_VLC_USE_NEW_STATIC);

  393.         }

  394. 

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

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

  397.             run_vlc[i].table_allocated = run_vlc_tables_size;

  398.             init_vlc(&run_vlc[i],

  399.                      RUN_VLC_BITS, 7,

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

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

  402.                      INIT_VLC_USE_NEW_STATIC);

  403.         }

  404.         run7_vlc.table = run7_vlc_table,

  405.         run7_vlc.table_allocated = run7_vlc_table_size;

  406.         init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,

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

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

  409.                  INIT_VLC_USE_NEW_STATIC);

  410. 

  411.         init_cavlc_level_tab();

  412.     }

  413. }

  414. 

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

  416.     unsigned int buf;

  417.     int log;

  418. 

  419.     OPEN_READER(re, gb);

  420.     UPDATE_CACHE(re, gb);

  421.     buf=GET_CACHE(re, gb);

  422. 

  423.     log= 32 - av_log2(buf);

  424. #ifdef TRACE

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

  426.     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__);

  427. #endif

  428. 

  429.     LAST_SKIP_BITS(re, gb, log);

  430.     CLOSE_READER(re, gb);

  431. 

  432.     return log-1;

  433. }

  434. 

  435. /**

  436.  * Decode a residual block.

  437.  * @param n block index

  438.  * @param scantable scantable

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

  440.  * @return <0 if an error occurred

  441.  */

  442. static int decode_residual(const H264Context *h, H264SliceContext *sl,

  443.                            GetBitContext *gb, int16_t *block, int n,

  444.                            const uint8_t *scantable, const uint32_t *qmul,

  445.                            int max_coeff)

  446. {

  447.     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};

  448.     int level[16];

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

  450. 

  451.     //FIXME put trailing_onex into the context

  452. 

  453.     if(max_coeff <= 8){

  454.         if (max_coeff == 4)

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

  456.         else

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

  458.         total_coeff= coeff_token>>2;

  459.     }else{

  460.         if(n >= LUMA_DC_BLOCK_INDEX){

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

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

  463.             total_coeff= coeff_token>>2;

  464.         }else{

  465.             total_coeff= pred_non_zero_count(h, sl, n);

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

  467.             total_coeff= coeff_token>>2;

  468.         }

  469.     }

  470.     sl->non_zero_count_cache[scan8[n]] = total_coeff;

  471. 

  472.     //FIXME set last_non_zero?

  473. 

  474.     if(total_coeff==0)

  475.         return 0;

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

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

  478.         return -1;

  479.     }

  480. 

  481.     trailing_ones= coeff_token&3;

  482.     ff_tlog(h->avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);

  483.     assert(total_coeff<=16);

  484. 

  485.     i = show_bits(gb, 3);

  486.     skip_bits(gb, trailing_ones);

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

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

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

  490. 

  491.     if(trailing_ones<total_coeff) {

  492.         int mask, prefix;

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

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

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

  496. 

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

  498.         if(level_code >= 100){

  499.             prefix= level_code - 100;

  500.             if(prefix == LEVEL_TAB_BITS)

  501.                 prefix += get_level_prefix(gb);

  502. 

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

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

  505.                 if(suffix_length)

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

  507.                 else

  508.                     level_code= prefix; //part

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

  510.                 if(suffix_length)

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

  512.                 else

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

  514.             }else{

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

  516.                 if(prefix>=16){

  517.                     if(prefix > 25+3){

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

  519.                         return -1;

  520.                     }

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

  522.                 }

  523.             }

  524. 

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

  526. 

  527.             suffix_length = 2;

  528.             mask= -(level_code&1);

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

  530.         }else{

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

  532. 

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

  534.             level[trailing_ones]= level_code;

  535.         }

  536. 

  537.         //remaining coefficients have suffix_length > 0

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

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

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

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

  542. 

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

  544.             if(level_code >= 100){

  545.                 prefix= level_code - 100;

  546.                 if(prefix == LEVEL_TAB_BITS){

  547.                     prefix += get_level_prefix(gb);

  548.                 }

  549.                 if(prefix<15){

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

  551.                 }else{

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

  553.                     if(prefix>=16)

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

  555.                 }

  556.                 mask= -(level_code&1);

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

  558.             }

  559.             level[i]= level_code;

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

  561.         }

  562.     }

  563. 

  564.     if(total_coeff == max_coeff)

  565.         zeros_left=0;

  566.     else{

  567.         if (max_coeff <= 8) {

  568.             if (max_coeff == 4)

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

  570.                                       CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1);

  571.             else

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

  573.                                       CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 1);

  574.         } else {

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

  576.         }

  577.     }

  578. 

  579. #define STORE_BLOCK(type) \

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

  581.     if(n >= LUMA_DC_BLOCK_INDEX){ \

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

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

  584.             if(zeros_left < 7) \

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

  586.             else \

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

  588.             zeros_left -= run_before; \

  589.             scantable -= 1 + run_before; \

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

  591.         } \

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

  593.             scantable--; \

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

  595.         } \

  596.     }else{ \

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

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

  599.             if(zeros_left < 7) \

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

  601.             else \

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

  603.             zeros_left -= run_before; \

  604.             scantable -= 1 + run_before; \

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

  606.         } \

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

  608.             scantable--; \

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

  610.         } \

  611.     }

  612. 

  613.     if (zeros_left < 0) {

  614.         av_log(h->avctx, AV_LOG_ERROR,

  615.                "negative number of zero coeffs at %d %d\n", sl->mb_x, sl->mb_y);

  616.         return AVERROR_INVALIDDATA;

  617.     }

  618. 

  619.     if (h->pixel_shift) {

  620.         STORE_BLOCK(int32_t)

  621.     } else {

  622.         STORE_BLOCK(int16_t)

  623.     }

  624. 

  625.     return 0;

  626. }

  627. 

  628. static av_always_inline

  629. int decode_luma_residual(const H264Context *h, H264SliceContext *sl,

  630.                          GetBitContext *gb, const uint8_t *scan,

  631.                          const uint8_t *scan8x8, int pixel_shift,

  632.                          int mb_type, int cbp, int p)

  633. {

  634.     int i4x4, i8x8;

  635.     int qscale = p == 0 ? sl->qscale : sl->chroma_qp[p - 1];

  636.     if(IS_INTRA16x16(mb_type)){

  637.         AV_ZERO128(sl->mb_luma_dc[p]+0);

  638.         AV_ZERO128(sl->mb_luma_dc[p]+8);

  639.         AV_ZERO128(sl->mb_luma_dc[p]+16);

  640.         AV_ZERO128(sl->mb_luma_dc[p]+24);

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

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

  643.         }

  644. 

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

  646. 

  647.         if(cbp&15){

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

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

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

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

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

  653.                         return -1;

  654.                     }

  655.                 }

  656.             }

  657.             return 0xf;

  658.         }else{

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

  660.             return 0;

  661.         }

  662.     }else{

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

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

  665.         int new_cbp = 0;

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

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

  668.                 if(IS_8x8DCT(mb_type)){

  669.                     int16_t *buf = &sl->mb[64*i8x8+256*p << pixel_shift];

  670.                     uint8_t *nnz;

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

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

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

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

  675.                             return -1;

  676.                     }

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

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

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

  680.                 }else{

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

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

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

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

  685.                             return -1;

  686.                         }

  687.                         new_cbp |= sl->non_zero_count_cache[scan8[index]] << i8x8;

  688.                     }

  689.                 }

  690.             }else{

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

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

  693.             }

  694.         }

  695.         return new_cbp;

  696.     }

  697. }

  698. 

  699. int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl)

  700. {

  701.     int mb_xy;

  702.     int partition_count;

  703.     unsigned int mb_type, cbp;

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

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

  706.     const int pixel_shift = h->pixel_shift;

  707. 

  708.     mb_xy = sl->mb_xy = sl->mb_x + sl->mb_y*h->mb_stride;

  709. 

  710.     ff_tlog(h->avctx, "pic:%d mb:%d/%d\n", h->frame_num, sl->mb_x, sl->mb_y);

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

  712.                 down the code */

  713.     if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {

  714.         if (sl->mb_skip_run == -1)

  715.             sl->mb_skip_run = get_ue_golomb(&sl->gb);

  716. 

  717.         if (sl->mb_skip_run--) {

  718.             if (FRAME_MBAFF(h) && (sl->mb_y & 1) == 0) {

  719.                 if (sl->mb_skip_run == 0)

  720.                     sl->mb_mbaff = sl->mb_field_decoding_flag = get_bits1(&sl->gb);

  721.             }

  722.             decode_mb_skip(h, sl);

  723.             return 0;

  724.         }

  725.     }

  726.     if (FRAME_MBAFF(h)) {

  727.         if ((sl->mb_y & 1) == 0)

  728.             sl->mb_mbaff = sl->mb_field_decoding_flag = get_bits1(&sl->gb);

  729.     }

  730. 

  731.     sl->prev_mb_skipped = 0;

  732. 

  733.     mb_type= get_ue_golomb(&sl->gb);

  734.     if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {

  735.         if(mb_type < 23){

  736.             partition_count= b_mb_type_info[mb_type].partition_count;

  737.             mb_type=         b_mb_type_info[mb_type].type;

  738.         }else{

  739.             mb_type -= 23;

  740.             goto decode_intra_mb;

  741.         }

  742.     } else if (sl->slice_type_nos == AV_PICTURE_TYPE_P) {

  743.         if(mb_type < 5){

  744.             partition_count= p_mb_type_info[mb_type].partition_count;

  745.             mb_type=         p_mb_type_info[mb_type].type;

  746.         }else{

  747.             mb_type -= 5;

  748.             goto decode_intra_mb;

  749.         }

  750.     }else{

  751.        assert(sl->slice_type_nos == AV_PICTURE_TYPE_I);

  752.         if (sl->slice_type == AV_PICTURE_TYPE_SI && mb_type)

  753.             mb_type--;

  754. decode_intra_mb:

  755.         if(mb_type > 25){

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

  757.             return -1;

  758.         }

  759.         partition_count=0;

  760.         cbp= i_mb_type_info[mb_type].cbp;

  761.         sl->intra16x16_pred_mode = i_mb_type_info[mb_type].pred_mode;

  762.         mb_type= i_mb_type_info[mb_type].type;

  763.     }

  764. 

  765.     if (MB_FIELD(sl))

  766.         mb_type |= MB_TYPE_INTERLACED;

  767. 

  768.     h->slice_table[mb_xy] = sl->slice_num;

  769. 

  770.     if(IS_INTRA_PCM(mb_type)){

  771.         const int mb_size = ff_h264_mb_sizes[h->sps.chroma_format_idc] *

  772.                             h->sps.bit_depth_luma;

  773. 

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

  775.         sl->intra_pcm_ptr = align_get_bits(&sl->gb);

  776.         if (get_bits_left(&sl->gb) < mb_size) {

  777.             av_log(h->avctx, AV_LOG_ERROR, "Not enough data for an intra PCM block.\n");

  778.             return AVERROR_INVALIDDATA;

  779.         }

  780.         skip_bits_long(&sl->gb, mb_size);

  781. 

  782.         // In deblocking, the quantizer is 0

  783.         h->cur_pic.qscale_table[mb_xy] = 0;

  784.         // All coeffs are present

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

  786. 

  787.         h->cur_pic.mb_type[mb_xy] = mb_type;

  788.         return 0;

  789.     }

  790. 

  791.     fill_decode_neighbors(h, sl, mb_type);

  792.     fill_decode_caches(h, sl, 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(&sl->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, sl, i);

  809. 

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

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

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

  813.                 }

  814. 

  815.                 if(di==4)

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

  817.                 else

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

  819.             }

  820.             write_back_intra_pred_mode(h, sl);

  821.             if (ff_h264_check_intra4x4_pred_mode(h, sl) < 0)

  822.                 return -1;

  823.         }else{

  824.             sl->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, sl, sl->intra16x16_pred_mode, 0);

  825.             if (sl->intra16x16_pred_mode < 0)

  826.                 return -1;

  827.         }

  828.         if(decode_chroma){

  829.             pred_mode= ff_h264_check_intra_pred_mode(h, sl, get_ue_golomb_31(&sl->gb), 1);

  830.             if(pred_mode < 0)

  831.                 return -1;

  832.             sl->chroma_pred_mode = pred_mode;

  833.         } else {

  834.             sl->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 (sl->slice_type_nos == AV_PICTURE_TYPE_B) {

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

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

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

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

  844.                     return -1;

  845.                 }

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

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

  848.             }

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

  850.                 ff_h264_pred_direct_motion(h, sl, &mb_type);

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

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

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

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

  855.             }

  856.         }else{

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

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

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

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

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

  862.                     return -1;

  863.                 }

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

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

  866.             }

  867.         }

  868. 

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

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

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

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

  873.                 if(IS_DIR(sl->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(&sl->gb)^1;

  879.                     }else{

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

  881.                         if(tmp>=ref_count){

  882.                             av_log(h->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, sl);

  896. 

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

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

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

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

  901.                     continue;

  902.                 }

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

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

  905. 

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

  907.                     const int sub_mb_type= sl->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]= &sl->mv_cache[list][ scan8[index] ];

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

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

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

  916.                         ff_tlog(h->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 *)&sl->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, sl, &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 < sl->list_count; list++) {

  948.                     unsigned int val;

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

  950.                         int rc = sl->ref_count[list] << MB_MBAFF(sl);

  951.                         if (rc == 1) {

  952.                             val= 0;

  953.                         } else if (rc == 2) {

  954.                             val= get_bits1(&sl->gb)^1;

  955.                         }else{

  956.                             val= get_ue_golomb_31(&sl->gb);

  957.                             if (val >= rc) {

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

  959.                                 return -1;

  960.                             }

  961.                         }

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

  963.                     }

  964.             }

  965.             for (list = 0; list < sl->list_count; list++) {

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

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

  968.                     mx += get_se_golomb(&sl->gb);

  969.                     my += get_se_golomb(&sl->gb);

  970.                     ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);

  971. 

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

  973.                 }

  974.             }

  975.         }

  976.         else if(IS_16X8(mb_type)){

  977.             for (list = 0; list < sl->list_count; list++) {

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

  979.                         unsigned int val;

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

  981.                             int rc = sl->ref_count[list] << MB_MBAFF(sl);

  982.                             if (rc == 1) {

  983.                                 val= 0;

  984.                             } else if (rc == 2) {

  985.                                 val= get_bits1(&sl->gb)^1;

  986.                             }else{

  987.                                 val= get_ue_golomb_31(&sl->gb);

  988.                                 if (val >= rc) {

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

  990.                                     return -1;

  991.                                 }

  992.                             }

  993.                         }else

  994.                             val= LIST_NOT_USED&0xFF;

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

  996.                     }

  997.             }

  998.             for (list = 0; list < sl->list_count; list++) {

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

  1000.                     unsigned int val;

  1001.                     if(IS_DIR(mb_type, i, list)){

  1002.                         pred_16x8_motion(h, sl, 8*i, list, sl->ref_cache[list][scan8[0] + 16*i], &mx, &my);

  1003.                         mx += get_se_golomb(&sl->gb);

  1004.                         my += get_se_golomb(&sl->gb);

  1005.                         ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);

  1006. 

  1007.                         val= pack16to32(mx,my);

  1008.                     }else

  1009.                         val=0;

  1010.                     fill_rectangle(sl->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);

  1011.                 }

  1012.             }

  1013.         }else{

  1014.             assert(IS_8X16(mb_type));

  1015.             for (list = 0; list < sl->list_count; list++) {

  1016.                     for(i=0; i<2; i++){

  1017.                         unsigned int val;

  1018.                         if(IS_DIR(mb_type, i, list)){ //FIXME optimize

  1019.                             int rc = sl->ref_count[list] << MB_MBAFF(sl);

  1020.                             if (rc == 1) {

  1021.                                 val= 0;

  1022.                             } else if (rc == 2) {

  1023.                                 val= get_bits1(&sl->gb)^1;

  1024.                             }else{

  1025.                                 val= get_ue_golomb_31(&sl->gb);

  1026.                                 if (val >= rc) {

  1027.                                     av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

  1028.                                     return -1;

  1029.                                 }

  1030.                             }

  1031.                         }else

  1032.                             val= LIST_NOT_USED&0xFF;

  1033.                         fill_rectangle(&sl->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);

  1034.                     }

  1035.             }

  1036.             for (list = 0; list < sl->list_count; list++) {

  1037.                 for(i=0; i<2; i++){

  1038.                     unsigned int val;

  1039.                     if(IS_DIR(mb_type, i, list)){

  1040.                         pred_8x16_motion(h, sl, i*4, list, sl->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);

  1041.                         mx += get_se_golomb(&sl->gb);

  1042.                         my += get_se_golomb(&sl->gb);

  1043.                         ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);

  1044. 

  1045.                         val= pack16to32(mx,my);

  1046.                     }else

  1047.                         val=0;

  1048.                     fill_rectangle(sl->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);

  1049.                 }

  1050.             }

  1051.         }

  1052.     }

  1053. 

  1054.     if(IS_INTER(mb_type))

  1055.         write_back_motion(h, sl, mb_type);

  1056. 

  1057.     if(!IS_INTRA16x16(mb_type)){

  1058.         cbp= get_ue_golomb(&sl->gb);

  1059. 

  1060.         if(decode_chroma){

  1061.             if(cbp > 47){

  1062.                 av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, sl->mb_x, sl->mb_y);

  1063.                 return -1;

  1064.             }

  1065.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp[cbp];

  1066.             else                     cbp= golomb_to_inter_cbp   [cbp];

  1067.         }else{

  1068.             if(cbp > 15){

  1069.                 av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, sl->mb_x, sl->mb_y);

  1070.                 return -1;

  1071.             }

  1072.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];

  1073.             else                     cbp= golomb_to_inter_cbp_gray[cbp];

  1074.         }

  1075.     }

  1076. 

  1077.     if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){

  1078.         mb_type |= MB_TYPE_8x8DCT*get_bits1(&sl->gb);

  1079.     }

  1080.     sl->cbp=

  1081.     h->cbp_table[mb_xy]= cbp;

  1082.     h->cur_pic.mb_type[mb_xy] = mb_type;

  1083. 

  1084.     if(cbp || IS_INTRA16x16(mb_type)){

  1085.         int i4x4, i8x8, chroma_idx;

  1086.         int dquant;

  1087.         int ret;

  1088.         GetBitContext *gb = &sl->gb;

  1089.         const uint8_t *scan, *scan8x8;

  1090.         const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);

  1091. 

  1092.         if(IS_INTERLACED(mb_type)){

  1093.             scan8x8 = sl->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;

  1094.             scan    = sl->qscale ? h->field_scan : h->field_scan_q0;

  1095.         }else{

  1096.             scan8x8 = sl->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;

  1097.             scan    = sl->qscale ? h->zigzag_scan : h->zigzag_scan_q0;

  1098.         }

  1099. 

  1100.         dquant= get_se_golomb(&sl->gb);

  1101. 

  1102.         sl->qscale += dquant;

  1103. 

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

  1105.             if (sl->qscale < 0) sl->qscale += max_qp + 1;

  1106.             else                sl->qscale -= max_qp+1;

  1107.             if (((unsigned)sl->qscale) > max_qp){

  1108.                 av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, sl->mb_x, sl->mb_y);

  1109.                 return -1;

  1110.             }

  1111.         }

  1112. 

  1113.         sl->chroma_qp[0] = get_chroma_qp(h, 0, sl->qscale);

  1114.         sl->chroma_qp[1] = get_chroma_qp(h, 1, sl->qscale);

  1115. 

  1116.         if ((ret = decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 0)) < 0 ) {

  1117.             return -1;

  1118.         }

  1119.         h->cbp_table[mb_xy] |= ret << 12;

  1120.         if (CHROMA444(h)) {

  1121.             if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 1) < 0 ) {

  1122.                 return -1;

  1123.             }

  1124.             if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 2) < 0 ) {

  1125.                 return -1;

  1126.             }

  1127.         } else if (CHROMA422(h)) {

  1128.             if(cbp&0x30){

  1129.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++)

  1130.                     if (decode_residual(h, sl, gb, sl->mb + ((256 + 16*16*chroma_idx) << pixel_shift),

  1131.                                         CHROMA_DC_BLOCK_INDEX+chroma_idx, chroma422_dc_scan,

  1132.                                         NULL, 8) < 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)][sl->chroma_qp[chroma_idx]];

  1140.                     int16_t *mb = sl->mb + (16*(16 + 16*chroma_idx) << pixel_shift);

  1141.                     for (i8x8 = 0; i8x8 < 2; i8x8++) {

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

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

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

  1145.                                 return -1;

  1146.                             mb += 16 << pixel_shift;

  1147.                         }

  1148.                     }

  1149.                 }

  1150.             }else{

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

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

  1153.             }

  1154.         } else /* yuv420 */ {

  1155.             if(cbp&0x30){

  1156.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++)

  1157.                     if( decode_residual(h, sl, gb, sl->mb + ((256 + 16*16*chroma_idx) << pixel_shift), CHROMA_DC_BLOCK_INDEX+chroma_idx, chroma_dc_scan, NULL, 4) < 0){

  1158.                         return -1;

  1159.                     }

  1160.             }

  1161. 

  1162.             if(cbp&0x20){

  1163.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++){

  1164.                     const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][sl->chroma_qp[chroma_idx]];

  1165.                     for(i4x4=0; i4x4<4; i4x4++){

  1166.                         const int index= 16 + 16*chroma_idx + i4x4;

  1167.                         if( decode_residual(h, sl, gb, sl->mb + (16*index << pixel_shift), index, scan + 1, qmul, 15) < 0){

  1168.                             return -1;

  1169.                         }

  1170.                     }

  1171.                 }

  1172.             }else{

  1173.                 fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1174.                 fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1175.             }

  1176.         }

  1177.     }else{

  1178.         fill_rectangle(&sl->non_zero_count_cache[scan8[ 0]], 4, 4, 8, 0, 1);

  1179.         fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1180.         fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1181.     }

  1182.     h->cur_pic.qscale_table[mb_xy] = sl->qscale;

  1183.     write_back_non_zero_count(h, sl);

  1184. 

  1185.     return 0;

  1186. }