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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(h) 0

  29. #define UNCHECKED_BITSTREAM_READER 1

  30. 

  31. #include "internal.h"

  32. #include "avcodec.h"

  33. #include "h264.h"

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

  35. #include "h264_mvpred.h"

  36. #include "golomb.h"

  37. #include "mpegutils.h"

  38. #include "libavutil/avassert.h"

  39. 

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

  285.  * @param n block index

  286.  */

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

  288. {

  289.     const int index8= scan8[n];

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

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

  292.     int i= left + top;

  293. 

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

  295. 

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

  297. 

  298.     return i&31;

  299. }

  300. 

  301. static av_cold void init_cavlc_level_tab(void){

  302.     int suffix_length;

  303.     unsigned int i;

  304. 

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

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

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

  308. 

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

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

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

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

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

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

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

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

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

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

  319.             }else{

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

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

  322.             }

  323.         }

  324.     }

  325. }

  326. 

  327. av_cold void ff_h264_decode_init_vlc(void){

  328.     static int done = 0;

  329. 

  330.     if (!done) {

  331.         int i;

  332.         int offset;

  333.         done = 1;

  334. 

  335.         chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;

  336.         chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;

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

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

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

  340.                  INIT_VLC_USE_NEW_STATIC);

  341. 

  342.         chroma422_dc_coeff_token_vlc.table = chroma422_dc_coeff_token_vlc_table;

  343.         chroma422_dc_coeff_token_vlc.table_allocated = chroma422_dc_coeff_token_vlc_table_size;

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

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

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

  347.                  INIT_VLC_USE_NEW_STATIC);

  348. 

  349.         offset = 0;

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

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

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

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

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

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

  356.                      INIT_VLC_USE_NEW_STATIC);

  357.             offset += coeff_token_vlc_tables_size[i];

  358.         }

  359.         /*

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

  361.          * the packed static coeff_token_vlc table sizes

  362.          * were initialized correctly.

  363.          */

  364.         av_assert0(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));

  365. 

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

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

  368.             chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;

  369.             init_vlc(&chroma_dc_total_zeros_vlc[i],

  370.                      CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,

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

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

  373.                      INIT_VLC_USE_NEW_STATIC);

  374.         }

  375. 

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

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

  378.             chroma422_dc_total_zeros_vlc[i].table_allocated = chroma422_dc_total_zeros_vlc_tables_size;

  379.             init_vlc(&chroma422_dc_total_zeros_vlc[i],

  380.                      CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 8,

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

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

  383.                      INIT_VLC_USE_NEW_STATIC);

  384.         }

  385. 

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

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

  388.             total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;

  389.             init_vlc(&total_zeros_vlc[i],

  390.                      TOTAL_ZEROS_VLC_BITS, 16,

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

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

  393.                      INIT_VLC_USE_NEW_STATIC);

  394.         }

  395. 

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

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

  398.             run_vlc[i].table_allocated = run_vlc_tables_size;

  399.             init_vlc(&run_vlc[i],

  400.                      RUN_VLC_BITS, 7,

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

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

  403.                      INIT_VLC_USE_NEW_STATIC);

  404.         }

  405.         run7_vlc.table = run7_vlc_table,

  406.         run7_vlc.table_allocated = run7_vlc_table_size;

  407.         init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,

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

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

  410.                  INIT_VLC_USE_NEW_STATIC);

  411. 

  412.         init_cavlc_level_tab();

  413.     }

  414. }

  415. 

  416. /**

  417.  *

  418.  */

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

  420.     unsigned int buf;

  421.     int log;

  422. 

  423.     OPEN_READER(re, gb);

  424.     UPDATE_CACHE(re, gb);

  425.     buf=GET_CACHE(re, gb);

  426. 

  427.     log= 32 - av_log2(buf);

  428. #ifdef TRACE

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

  430.     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__);

  431. #endif

  432. 

  433.     LAST_SKIP_BITS(re, gb, log);

  434.     CLOSE_READER(re, gb);

  435. 

  436.     return log-1;

  437. }

  438. 

  439. /**

  440.  * Decode a residual block.

  441.  * @param n block index

  442.  * @param scantable scantable

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

  444.  * @return <0 if an error occurred

  445.  */

  446. static int decode_residual(H264Context *h, H264SliceContext *sl,

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

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

  449.                            int max_coeff)

  450. {

  451.     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};

  452.     int level[16];

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

  454. 

  455.     //FIXME put trailing_onex into the context

  456. 

  457.     if(max_coeff <= 8){

  458.         if (max_coeff == 4)

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

  460.         else

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

  462.         total_coeff= coeff_token>>2;

  463.     }else{

  464.         if(n >= LUMA_DC_BLOCK_INDEX){

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

  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.         }else{

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

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

  471.             total_coeff= coeff_token>>2;

  472.         }

  473.     }

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

  475. 

  476.     //FIXME set last_non_zero?

  477. 

  478.     if(total_coeff==0)

  479.         return 0;

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

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

  482.         return -1;

  483.     }

  484. 

  485.     trailing_ones= coeff_token&3;

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

  487.     av_assert2(total_coeff<=16);

  488. 

  489.     i = show_bits(gb, 3);

  490.     skip_bits(gb, trailing_ones);

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

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

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

  494. 

  495.     if(trailing_ones<total_coeff) {

  496.         int mask, prefix;

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

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

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

  500. 

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

  502.         if(level_code >= 100){

  503.             prefix= level_code - 100;

  504.             if(prefix == LEVEL_TAB_BITS)

  505.                 prefix += get_level_prefix(gb);

  506. 

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

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

  509.                 if(suffix_length)

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

  511.                 else

  512.                     level_code= prefix; //part

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

  514.                 if(suffix_length)

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

  516.                 else

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

  518.             }else{

  519.                 level_code= 30;

  520.                 if(prefix>=16){

  521.                     if(prefix > 25+3){

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

  523.                         return -1;

  524.                     }

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

  526.                 }

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

  528.             }

  529. 

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

  531. 

  532.             suffix_length = 2;

  533.             mask= -(level_code&1);

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

  535.         }else{

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

  537. 

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

  539.             level[trailing_ones]= level_code;

  540.         }

  541. 

  542.         //remaining coefficients have suffix_length > 0

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

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

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

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

  547. 

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

  549.             if(level_code >= 100){

  550.                 prefix= level_code - 100;

  551.                 if(prefix == LEVEL_TAB_BITS){

  552.                     prefix += get_level_prefix(gb);

  553.                 }

  554.                 if(prefix<15){

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

  556.                 }else{

  557.                     level_code = 15<<suffix_length;

  558.                     if (prefix>=16) {

  559.                         if(prefix > 25+3){

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

  561.                             return AVERROR_INVALIDDATA;

  562.                         }

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

  564.                     }

  565.                     level_code += get_bits(gb, prefix-3);

  566.                 }

  567.                 mask= -(level_code&1);

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

  569.             }

  570.             level[i]= level_code;

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

  572.         }

  573.     }

  574. 

  575.     if(total_coeff == max_coeff)

  576.         zeros_left=0;

  577.     else{

  578.         if (max_coeff <= 8) {

  579.             if (max_coeff == 4)

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

  581.                                       CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1);

  582.             else

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

  584.                                       CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 1);

  585.         } else {

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

  587.         }

  588.     }

  589. 

  590. #define STORE_BLOCK(type) \

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

  592.     if(n >= LUMA_DC_BLOCK_INDEX){ \

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

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

  595.             if(zeros_left < 7) \

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

  597.             else \

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

  599.             zeros_left -= run_before; \

  600.             scantable -= 1 + run_before; \

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

  602.         } \

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

  604.             scantable--; \

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

  606.         } \

  607.     }else{ \

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

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

  610.             if(zeros_left < 7) \

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

  612.             else \

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

  614.             zeros_left -= run_before; \

  615.             scantable -= 1 + run_before; \

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

  617.         } \

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

  619.             scantable--; \

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

  621.         } \

  622.     }

  623. 

  624.     if (h->pixel_shift) {

  625.         STORE_BLOCK(int32_t)

  626.     } else {

  627.         STORE_BLOCK(int16_t)

  628.     }

  629. 

  630.     if(zeros_left<0){

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

  632.         return -1;

  633.     }

  634. 

  635.     return 0;

  636. }

  637. 

  638. static av_always_inline int decode_luma_residual(H264Context *h, H264SliceContext *sl, GetBitContext *gb, const uint8_t *scan, const uint8_t *scan8x8, int pixel_shift, int mb_type, int cbp, int p){

  639.     int i4x4, i8x8;

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

  641.     if(IS_INTRA16x16(mb_type)){

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

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

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

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

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

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

  648.         }

  649. 

  650.         av_assert2((cbp&15) == 0 || (cbp&15) == 15);

  651. 

  652.         if(cbp&15){

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

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

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

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

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

  658.                         return -1;

  659.                     }

  660.                 }

  661.             }

  662.             return 0xf;

  663.         }else{

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

  665.             return 0;

  666.         }

  667.     }else{

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

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

  670.         int new_cbp = 0;

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

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

  673.                 if(IS_8x8DCT(mb_type)){

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

  675.                     uint8_t *nnz;

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

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

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

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

  680.                             return -1;

  681.                     }

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

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

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

  685.                 }else{

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

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

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

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

  690.                             return -1;

  691.                         }

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

  693.                     }

  694.                 }

  695.             }else{

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

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

  698.             }

  699.         }

  700.         return new_cbp;

  701.     }

  702. }

  703. 

  704. int ff_h264_decode_mb_cavlc(H264Context *h, H264SliceContext *sl)

  705. {

  706.     int mb_xy;

  707.     int partition_count;

  708.     unsigned int mb_type, cbp;

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

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

  711.     const int pixel_shift = h->pixel_shift;

  712.     unsigned local_ref_count[2];

  713. 

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

  715. 

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

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

  718.                 down the code */

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

  720.         if(h->mb_skip_run==-1)

  721.             h->mb_skip_run= get_ue_golomb_long(&h->gb);

  722. 

  723.         if (h->mb_skip_run--) {

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

  725.                 if(h->mb_skip_run==0)

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

  727.             }

  728.             decode_mb_skip(h, sl);

  729.             return 0;

  730.         }

  731.     }

  732.     if (FRAME_MBAFF(h)) {

  733.         if( (h->mb_y&1) == 0 )

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

  735.     }

  736. 

  737.     sl->prev_mb_skipped = 0;

  738. 

  739.     mb_type= get_ue_golomb(&h->gb);

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

  741.         if(mb_type < 23){

  742.             partition_count= b_mb_type_info[mb_type].partition_count;

  743.             mb_type=         b_mb_type_info[mb_type].type;

  744.         }else{

  745.             mb_type -= 23;

  746.             goto decode_intra_mb;

  747.         }

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

  749.         if(mb_type < 5){

  750.             partition_count= p_mb_type_info[mb_type].partition_count;

  751.             mb_type=         p_mb_type_info[mb_type].type;

  752.         }else{

  753.             mb_type -= 5;

  754.             goto decode_intra_mb;

  755.         }

  756.     }else{

  757.        av_assert2(sl->slice_type_nos == AV_PICTURE_TYPE_I);

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

  759.             mb_type--;

  760. decode_intra_mb:

  761.         if(mb_type > 25){

  762.             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), h->mb_x, h->mb_y);

  763.             return -1;

  764.         }

  765.         partition_count=0;

  766.         cbp= i_mb_type_info[mb_type].cbp;

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

  768.         mb_type= i_mb_type_info[mb_type].type;

  769.     }

  770. 

  771.     if(MB_FIELD(h))

  772.         mb_type |= MB_TYPE_INTERLACED;

  773. 

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

  775. 

  776.     if(IS_INTRA_PCM(mb_type)){

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

  778.                             h->sps.bit_depth_luma;

  779. 

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

  781.         h->intra_pcm_ptr = align_get_bits(&h->gb);

  782.         if (get_bits_left(&h->gb) < mb_size) {

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

  784.             return AVERROR_INVALIDDATA;

  785.         }

  786.         skip_bits_long(&h->gb, mb_size);

  787. 

  788.         // In deblocking, the quantizer is 0

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

  790.         // All coeffs are present

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

  792. 

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

  794.         return 0;

  795.     }

  796. 

  797.     local_ref_count[0] = h->ref_count[0] << MB_MBAFF(h);

  798.     local_ref_count[1] = h->ref_count[1] << MB_MBAFF(h);

  799. 

  800.     fill_decode_neighbors(h, sl, mb_type);

  801.     fill_decode_caches(h, sl, mb_type);

  802. 

  803.     //mb_pred

  804.     if(IS_INTRA(mb_type)){

  805.         int pred_mode;

  806. //            init_top_left_availability(h);

  807.         if(IS_INTRA4x4(mb_type)){

  808.             int i;

  809.             int di = 1;

  810.             if(dct8x8_allowed && get_bits1(&h->gb)){

  811.                 mb_type |= MB_TYPE_8x8DCT;

  812.                 di = 4;

  813.             }

  814. 

  815. //                fill_intra4x4_pred_table(h);

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

  817.                 int mode = pred_intra_mode(h, sl, i);

  818. 

  819.                 if(!get_bits1(&h->gb)){

  820.                     const int rem_mode= get_bits(&h->gb, 3);

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

  822.                 }

  823. 

  824.                 if(di==4)

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

  826.                 else

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

  828.             }

  829.             write_back_intra_pred_mode(h, sl);

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

  831.                 return -1;

  832.         }else{

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

  834.             if (sl->intra16x16_pred_mode < 0)

  835.                 return -1;

  836.         }

  837.         if(decode_chroma){

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

  839.             if(pred_mode < 0)

  840.                 return -1;

  841.             sl->chroma_pred_mode = pred_mode;

  842.         } else {

  843.             sl->chroma_pred_mode = DC_128_PRED8x8;

  844.         }

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

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

  847. 

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

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

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

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

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

  853.                     return -1;

  854.                 }

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

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

  857.             }

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

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

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

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

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

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

  864.             }

  865.         }else{

  866.             av_assert2(sl->slice_type_nos == AV_PICTURE_TYPE_P); //FIXME SP correct ?

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

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

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

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

  871.                     return -1;

  872.                 }

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

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

  875.             }

  876.         }

  877. 

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

  879.             int ref_count = IS_REF0(mb_type) ? 1 : local_ref_count[list];

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

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

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

  883.                     unsigned int tmp;

  884.                     if(ref_count == 1){

  885.                         tmp= 0;

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

  887.                         tmp= get_bits1(&h->gb)^1;

  888.                     }else{

  889.                         tmp= get_ue_golomb_31(&h->gb);

  890.                         if(tmp>=ref_count){

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

  892.                             return -1;

  893.                         }

  894.                     }

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

  896.                 }else{

  897.                  //FIXME

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

  899.                 }

  900.             }

  901.         }

  902. 

  903.         if(dct8x8_allowed)

  904.             dct8x8_allowed = get_dct8x8_allowed(h);

  905. 

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

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

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

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

  910.                     continue;

  911.                 }

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

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

  914. 

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

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

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

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

  919.                         int mx, my;

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

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

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

  923.                         mx += get_se_golomb(&h->gb);

  924.                         my += get_se_golomb(&h->gb);

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

  926. 

  927.                         if(IS_SUB_8X8(sub_mb_type)){

  928.                             mv_cache[ 1 ][0]=

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

  930.                             mv_cache[ 1 ][1]=

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

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

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

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

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

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

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

  938.                         }

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

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

  941.                     }

  942.                 }else{

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

  944.                     p[0] = p[1]=

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

  946.                 }

  947.             }

  948.         }

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

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

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

  952.     }else{

  953.         int list, mx, my, i;

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

  955.         if(IS_16X16(mb_type)){

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

  957.                     unsigned int val;

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

  959.                         if(local_ref_count[list]==1){

  960.                             val= 0;

  961.                         } else if(local_ref_count[list]==2){

  962.                             val= get_bits1(&h->gb)^1;

  963.                         }else{

  964.                             val= get_ue_golomb_31(&h->gb);

  965.                             if (val >= local_ref_count[list]){

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

  967.                                 return -1;

  968.                             }

  969.                         }

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

  971.                     }

  972.             }

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

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

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

  976.                     mx += get_se_golomb(&h->gb);

  977.                     my += get_se_golomb(&h->gb);

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

  979. 

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

  981.                 }

  982.             }

  983.         }

  984.         else if(IS_16X8(mb_type)){

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

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

  987.                         unsigned int val;

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

  989.                             if(local_ref_count[list] == 1) {

  990.                                 val= 0;

  991.                             } else if(local_ref_count[list] == 2) {

  992.                                 val= get_bits1(&h->gb)^1;

  993.                             }else{

  994.                                 val= get_ue_golomb_31(&h->gb);

  995.                                 if (val >= local_ref_count[list]){

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

  997.                                     return -1;

  998.                                 }

  999.                             }

  1000.                         }else

  1001.                             val= LIST_NOT_USED&0xFF;

  1002.                         fill_rectangle(&sl->ref_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 1);

  1003.                     }

  1004.             }

  1005.             for(list=0; list<h->list_count; list++){

  1006.                 for(i=0; i<2; i++){

  1007.                     unsigned int val;

  1008.                     if(IS_DIR(mb_type, i, list)){

  1009.                         pred_16x8_motion(h, sl, 8*i, list, sl->ref_cache[list][scan8[0] + 16*i], &mx, &my);

  1010.                         mx += get_se_golomb(&h->gb);

  1011.                         my += get_se_golomb(&h->gb);

  1012.                         tprintf(h->avctx, "final mv:%d %d\n", mx, my);

  1013. 

  1014.                         val= pack16to32(mx,my);

  1015.                     }else

  1016.                         val=0;

  1017.                     fill_rectangle(sl->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);

  1018.                 }

  1019.             }

  1020.         }else{

  1021.             av_assert2(IS_8X16(mb_type));

  1022.             for(list=0; list<h->list_count; list++){

  1023.                     for(i=0; i<2; i++){

  1024.                         unsigned int val;

  1025.                         if(IS_DIR(mb_type, i, list)){ //FIXME optimize

  1026.                             if(local_ref_count[list]==1){

  1027.                                 val= 0;

  1028.                             } else if(local_ref_count[list]==2){

  1029.                                 val= get_bits1(&h->gb)^1;

  1030.                             }else{

  1031.                                 val= get_ue_golomb_31(&h->gb);

  1032.                                 if (val >= local_ref_count[list]){

  1033.                                     av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

  1034.                                     return -1;

  1035.                                 }

  1036.                             }

  1037.                         }else

  1038.                             val= LIST_NOT_USED&0xFF;

  1039.                         fill_rectangle(&sl->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);

  1040.                     }

  1041.             }

  1042.             for(list=0; list<h->list_count; list++){

  1043.                 for(i=0; i<2; i++){

  1044.                     unsigned int val;

  1045.                     if(IS_DIR(mb_type, i, list)){

  1046.                         pred_8x16_motion(h, sl, i*4, list, sl->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);

  1047.                         mx += get_se_golomb(&h->gb);

  1048.                         my += get_se_golomb(&h->gb);

  1049.                         tprintf(h->avctx, "final mv:%d %d\n", mx, my);

  1050. 

  1051.                         val= pack16to32(mx,my);

  1052.                     }else

  1053.                         val=0;

  1054.                     fill_rectangle(sl->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);

  1055.                 }

  1056.             }

  1057.         }

  1058.     }

  1059. 

  1060.     if(IS_INTER(mb_type))

  1061.         write_back_motion(h, sl, mb_type);

  1062. 

  1063.     if(!IS_INTRA16x16(mb_type)){

  1064.         cbp= get_ue_golomb(&h->gb);

  1065. 

  1066.         if(decode_chroma){

  1067.             if(cbp > 47){

  1068.                 av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, h->mb_x, h->mb_y);

  1069.                 return -1;

  1070.             }

  1071.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp[cbp];

  1072.             else                     cbp= golomb_to_inter_cbp   [cbp];

  1073.         }else{

  1074.             if(cbp > 15){

  1075.                 av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, h->mb_x, h->mb_y);

  1076.                 return -1;

  1077.             }

  1078.             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];

  1079.             else                     cbp= golomb_to_inter_cbp_gray[cbp];

  1080.         }

  1081.     } else {

  1082.         if (!decode_chroma && cbp>15) {

  1083.             av_log(h->avctx, AV_LOG_ERROR, "gray chroma\n");

  1084.             return AVERROR_INVALIDDATA;

  1085.         }

  1086.     }

  1087. 

  1088.     if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){

  1089.         mb_type |= MB_TYPE_8x8DCT*get_bits1(&h->gb);

  1090.     }

  1091.     h->cbp=

  1092.     h->cbp_table[mb_xy]= cbp;

  1093.     h->cur_pic.mb_type[mb_xy] = mb_type;

  1094. 

  1095.     if(cbp || IS_INTRA16x16(mb_type)){

  1096.         int i4x4, i8x8, chroma_idx;

  1097.         int dquant;

  1098.         int ret;

  1099.         GetBitContext *gb= IS_INTRA(mb_type) ? h->intra_gb_ptr : h->inter_gb_ptr;

  1100.         const uint8_t *scan, *scan8x8;

  1101.         const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);

  1102. 

  1103.         if(IS_INTERLACED(mb_type)){

  1104.             scan8x8 = sl->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;

  1105.             scan    = sl->qscale ? h->field_scan : h->field_scan_q0;

  1106.         }else{

  1107.             scan8x8 = sl->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;

  1108.             scan    = sl->qscale ? h->zigzag_scan : h->zigzag_scan_q0;

  1109.         }

  1110. 

  1111.         dquant= get_se_golomb(&h->gb);

  1112. 

  1113.         sl->qscale += dquant;

  1114. 

  1115.         if (((unsigned)sl->qscale) > max_qp){

  1116.             if (sl->qscale < 0) sl->qscale += max_qp + 1;

  1117.             else                sl->qscale -= max_qp+1;

  1118.             if (((unsigned)sl->qscale) > max_qp){

  1119.                 av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, h->mb_x, h->mb_y);

  1120.                 return -1;

  1121.             }

  1122.         }

  1123. 

  1124.         sl->chroma_qp[0] = get_chroma_qp(h, 0, sl->qscale);

  1125.         sl->chroma_qp[1] = get_chroma_qp(h, 1, sl->qscale);

  1126. 

  1127.         if ((ret = decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 0)) < 0 ) {

  1128.             return -1;

  1129.         }

  1130.         h->cbp_table[mb_xy] |= ret << 12;

  1131.         if (CHROMA444(h)) {

  1132.             if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 1) < 0 ) {

  1133.                 return -1;

  1134.             }

  1135.             if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 2) < 0 ) {

  1136.                 return -1;

  1137.             }

  1138.         } else {

  1139.             const int num_c8x8 = h->sps.chroma_format_idc;

  1140. 

  1141.             if(cbp&0x30){

  1142.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++)

  1143.                     if (decode_residual(h, sl, gb, h->mb + ((256 + 16*16*chroma_idx) << pixel_shift),

  1144.                                         CHROMA_DC_BLOCK_INDEX+chroma_idx,

  1145.                                         CHROMA422(h) ? chroma422_dc_scan : chroma_dc_scan,

  1146.                                         NULL, 4*num_c8x8) < 0) {

  1147.                         return -1;

  1148.                     }

  1149.             }

  1150. 

  1151.             if(cbp&0x20){

  1152.                 for(chroma_idx=0; chroma_idx<2; chroma_idx++){

  1153.                     const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][sl->chroma_qp[chroma_idx]];

  1154.                     int16_t *mb = h->mb + (16*(16 + 16*chroma_idx) << pixel_shift);

  1155.                     for (i8x8 = 0; i8x8<num_c8x8; i8x8++) {

  1156.                         for (i4x4 = 0; i4x4 < 4; i4x4++) {

  1157.                             const int index = 16 + 16*chroma_idx + 8*i8x8 + i4x4;

  1158.                             if (decode_residual(h, sl, gb, mb, index, scan + 1, qmul, 15) < 0)

  1159.                                 return -1;

  1160.                             mb += 16 << pixel_shift;

  1161.                         }

  1162.                     }

  1163.                 }

  1164.             }else{

  1165.                 fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1166.                 fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1167.             }

  1168.         }

  1169.     }else{

  1170.         fill_rectangle(&sl->non_zero_count_cache[scan8[ 0]], 4, 4, 8, 0, 1);

  1171.         fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

  1172.         fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

  1173.     }

  1174.     h->cur_pic.qscale_table[mb_xy] = sl->qscale;

  1175.     write_back_non_zero_count(h, sl);

  1176. 

  1177.     return 0;

  1178. }