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   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... cavlc bitstream decoding
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * H.264 / AVC / MPEG4 part10 cavlc bitstream decoding.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #define CABAC 0
  29
  30 #include "internal.h"
  31 #include "avcodec.h"
  32 #include "mpegvideo.h"
  33 #include "h264.h"
  34 #include "h264data.h" // FIXME FIXME FIXME
  35 #include "h264_mvpred.h"
  36 #include "golomb.h"
  37
  38 //#undef NDEBUG
  39 #include <assert.h>
  40
  41 static const uint8_t golomb_to_inter_cbp_gray[16]={
  42  0, 1, 2, 4, 8, 3, 5,10,12,15, 7,11,13,14, 6, 9,
  43 };
  44
  45 static const uint8_t golomb_to_intra4x4_cbp_gray[16]={
  46 15, 0, 7,11,13,14, 3, 5,10,12, 1, 2, 4, 8, 6, 9,
  47 };
  48
  49 static const uint8_t chroma_dc_coeff_token_len[4*5]={
  50  2, 0, 0, 0,
  51  6, 1, 0, 0,
  52  6, 6, 3, 0,
  53  6, 7, 7, 6,
  54  6, 8, 8, 7,
  55 };
  56
  57 static const uint8_t chroma_dc_coeff_token_bits[4*5]={
  58  1, 0, 0, 0,
  59  7, 1, 0, 0,
  60  4, 6, 1, 0,
  61  3, 3, 2, 5,
  62  2, 3, 2, 0,
  63 };
  64
  65 static const uint8_t coeff_token_len[4][4*17]={
  66 {
  67      1, 0, 0, 0,
  68      6, 2, 0, 0,     8, 6, 3, 0,     9, 8, 7, 5,    10, 9, 8, 6,
  69     11,10, 9, 7,    13,11,10, 8,    13,13,11, 9,    13,13,13,10,
  70     14,14,13,11,    14,14,14,13,    15,15,14,14,    15,15,15,14,
  71     16,15,15,15,    16,16,16,15,    16,16,16,16,    16,16,16,16,
  72 },
  73 {
  74      2, 0, 0, 0,
  75      6, 2, 0, 0,     6, 5, 3, 0,     7, 6, 6, 4,     8, 6, 6, 4,
  76      8, 7, 7, 5,     9, 8, 8, 6,    11, 9, 9, 6,    11,11,11, 7,
  77     12,11,11, 9,    12,12,12,11,    12,12,12,11,    13,13,13,12,
  78     13,13,13,13,    13,14,13,13,    14,14,14,13,    14,14,14,14,
  79 },
  80 {
  81      4, 0, 0, 0,
  82      6, 4, 0, 0,     6, 5, 4, 0,     6, 5, 5, 4,     7, 5, 5, 4,
  83      7, 5, 5, 4,     7, 6, 6, 4,     7, 6, 6, 4,     8, 7, 7, 5,
  84      8, 8, 7, 6,     9, 8, 8, 7,     9, 9, 8, 8,     9, 9, 9, 8,
  85     10, 9, 9, 9,    10,10,10,10,    10,10,10,10,    10,10,10,10,
  86 },
  87 {
  88      6, 0, 0, 0,
  89      6, 6, 0, 0,     6, 6, 6, 0,     6, 6, 6, 6,     6, 6, 6, 6,
  90      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,
  91      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,
  92      6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,     6, 6, 6, 6,
  93 }
  94 };
  95
  96 static const uint8_t coeff_token_bits[4][4*17]={
  97 {
  98      1, 0, 0, 0,
  99      5, 1, 0, 0,     7, 4, 1, 0,     7, 6, 5, 3,     7, 6, 5, 3,
 100      7, 6, 5, 4,    15, 6, 5, 4,    11,14, 5, 4,     8,10,13, 4,
 101     15,14, 9, 4,    11,10,13,12,    15,14, 9,12,    11,10,13, 8,
 102     15, 1, 9,12,    11,14,13, 8,     7,10, 9,12,     4, 6, 5, 8,
 103 },
 104 {
 105      3, 0, 0, 0,
 106     11, 2, 0, 0,     7, 7, 3, 0,     7,10, 9, 5,     7, 6, 5, 4,
 107      4, 6, 5, 6,     7, 6, 5, 8,    15, 6, 5, 4,    11,14,13, 4,
 108     15,10, 9, 4,    11,14,13,12,     8,10, 9, 8,    15,14,13,12,
 109     11,10, 9,12,     7,11, 6, 8,     9, 8,10, 1,     7, 6, 5, 4,
 110 },
 111 {
 112     15, 0, 0, 0,
 113     15,14, 0, 0,    11,15,13, 0,     8,12,14,12,    15,10,11,11,
 114     11, 8, 9,10,     9,14,13, 9,     8,10, 9, 8,    15,14,13,13,
 115     11,14,10,12,    15,10,13,12,    11,14, 9,12,     8,10,13, 8,
 116     13, 7, 9,12,     9,12,11,10,     5, 8, 7, 6,     1, 4, 3, 2,
 117 },
 118 {
 119      3, 0, 0, 0,
 120      0, 1, 0, 0,     4, 5, 6, 0,     8, 9,10,11,    12,13,14,15,
 121     16,17,18,19,    20,21,22,23,    24,25,26,27,    28,29,30,31,
 122     32,33,34,35,    36,37,38,39,    40,41,42,43,    44,45,46,47,
 123     48,49,50,51,    52,53,54,55,    56,57,58,59,    60,61,62,63,
 124 }
 125 };
 126
 127 static const uint8_t total_zeros_len[16][16]= {
 128     {1,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9},
 129     {3,3,3,3,3,4,4,4,4,5,5,6,6,6,6},
 130     {4,3,3,3,4,4,3,3,4,5,5,6,5,6},
 131     {5,3,4,4,3,3,3,4,3,4,5,5,5},
 132     {4,4,4,3,3,3,3,3,4,5,4,5},
 133     {6,5,3,3,3,3,3,3,4,3,6},
 134     {6,5,3,3,3,2,3,4,3,6},
 135     {6,4,5,3,2,2,3,3,6},
 136     {6,6,4,2,2,3,2,5},
 137     {5,5,3,2,2,2,4},
 138     {4,4,3,3,1,3},
 139     {4,4,2,1,3},
 140     {3,3,1,2},
 141     {2,2,1},
 142     {1,1},
 143 };
 144
 145 static const uint8_t total_zeros_bits[16][16]= {
 146     {1,3,2,3,2,3,2,3,2,3,2,3,2,3,2,1},
 147     {7,6,5,4,3,5,4,3,2,3,2,3,2,1,0},
 148     {5,7,6,5,4,3,4,3,2,3,2,1,1,0},
 149     {3,7,5,4,6,5,4,3,3,2,2,1,0},
 150     {5,4,3,7,6,5,4,3,2,1,1,0},
 151     {1,1,7,6,5,4,3,2,1,1,0},
 152     {1,1,5,4,3,3,2,1,1,0},
 153     {1,1,1,3,3,2,2,1,0},
 154     {1,0,1,3,2,1,1,1},
 155     {1,0,1,3,2,1,1},
 156     {0,1,1,2,1,3},
 157     {0,1,1,1,1},
 158     {0,1,1,1},
 159     {0,1,1},
 160     {0,1},
 161 };
 162
 163 static const uint8_t chroma_dc_total_zeros_len[3][4]= {
 164     { 1, 2, 3, 3,},
 165     { 1, 2, 2, 0,},
 166     { 1, 1, 0, 0,},
 167 };
 168
 169 static const uint8_t chroma_dc_total_zeros_bits[3][4]= {
 170     { 1, 1, 1, 0,},
 171     { 1, 1, 0, 0,},
 172     { 1, 0, 0, 0,},
 173 };
 174
 175 static const uint8_t run_len[7][16]={
 176     {1,1},
 177     {1,2,2},
 178     {2,2,2,2},
 179     {2,2,2,3,3},
 180     {2,2,3,3,3,3},
 181     {2,3,3,3,3,3,3},
 182     {3,3,3,3,3,3,3,4,5,6,7,8,9,10,11},
 183 };
 184
 185 static const uint8_t run_bits[7][16]={
 186     {1,0},
 187     {1,1,0},
 188     {3,2,1,0},
 189     {3,2,1,1,0},
 190     {3,2,3,2,1,0},
 191     {3,0,1,3,2,5,4},
 192     {7,6,5,4,3,2,1,1,1,1,1,1,1,1,1},
 193 };
 194
 195 static VLC coeff_token_vlc[4];
 196 static VLC_TYPE coeff_token_vlc_tables[520+332+280+256][2];
 197 static const int coeff_token_vlc_tables_size[4]={520,332,280,256};
 198
 199 static VLC chroma_dc_coeff_token_vlc;
 200 static VLC_TYPE chroma_dc_coeff_token_vlc_table[256][2];
 201 static const int chroma_dc_coeff_token_vlc_table_size = 256;
 202
 203 static VLC total_zeros_vlc[15];
 204 static VLC_TYPE total_zeros_vlc_tables[15][512][2];
 205 static const int total_zeros_vlc_tables_size = 512;
 206
 207 static VLC chroma_dc_total_zeros_vlc[3];
 208 static VLC_TYPE chroma_dc_total_zeros_vlc_tables[3][8][2];
 209 static const int chroma_dc_total_zeros_vlc_tables_size = 8;
 210
 211 static VLC run_vlc[6];
 212 static VLC_TYPE run_vlc_tables[6][8][2];
 213 static const int run_vlc_tables_size = 8;
 214
 215 static VLC run7_vlc;
 216 static VLC_TYPE run7_vlc_table[96][2];
 217 static const int run7_vlc_table_size = 96;
 218
 219 #define LEVEL_TAB_BITS 8
 220 static int8_t cavlc_level_tab[7][1<<LEVEL_TAB_BITS][2];
 221
 222
 223 /**
 224  * gets the predicted number of non-zero coefficients.
 225  * @param n block index
 226  */
 227 static inline int pred_non_zero_count(H264Context *h, int n){
 228     const int index8= scan8[n];
 229     const int left= h->non_zero_count_cache[index8 - 1];
 230     const int top = h->non_zero_count_cache[index8 - 8];
 231     int i= left + top;
 232
 233     if(i<64) i= (i+1)>>1;
 234
 235     tprintf(h->s.avctx, "pred_nnz L%X T%X n%d s%d P%X\n", left, top, n, scan8[n], i&31);
 236
 237     return i&31;
 238 }
 239
 240 static av_cold void init_cavlc_level_tab(void){
 241     int suffix_length, mask;
 242     unsigned int i;
 243
 244     for(suffix_length=0; suffix_length<7; suffix_length++){
 245         for(i=0; i<(1<<LEVEL_TAB_BITS); i++){
 246             int prefix= LEVEL_TAB_BITS - av_log2(2*i);
 247             int level_code= (prefix<<suffix_length) + (i>>(LEVEL_TAB_BITS-prefix-1-suffix_length)) - (1<<suffix_length);
 248
 249             mask= -(level_code&1);
 250             level_code= (((2+level_code)>>1) ^ mask) - mask;
 251             if(prefix + 1 + suffix_length <= LEVEL_TAB_BITS){
 252                 cavlc_level_tab[suffix_length][i][0]= level_code;
 253                 cavlc_level_tab[suffix_length][i][1]= prefix + 1 + suffix_length;
 254             }else if(prefix + 1 <= LEVEL_TAB_BITS){
 255                 cavlc_level_tab[suffix_length][i][0]= prefix+100;
 256                 cavlc_level_tab[suffix_length][i][1]= prefix + 1;
 257             }else{
 258                 cavlc_level_tab[suffix_length][i][0]= LEVEL_TAB_BITS+100;
 259                 cavlc_level_tab[suffix_length][i][1]= LEVEL_TAB_BITS;
 260             }
 261         }
 262     }
 263 }
 264
 265 av_cold void ff_h264_decode_init_vlc(void){
 266     static int done = 0;
 267
 268     if (!done) {
 269         int i;
 270         int offset;
 271         done = 1;
 272
 273         chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;
 274         chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;
 275         init_vlc(&chroma_dc_coeff_token_vlc, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 4*5,
 276                  &chroma_dc_coeff_token_len [0], 1, 1,
 277                  &chroma_dc_coeff_token_bits[0], 1, 1,
 278                  INIT_VLC_USE_NEW_STATIC);
 279
 280         offset = 0;
 281         for(i=0; i<4; i++){
 282             coeff_token_vlc[i].table = coeff_token_vlc_tables+offset;
 283             coeff_token_vlc[i].table_allocated = coeff_token_vlc_tables_size[i];
 284             init_vlc(&coeff_token_vlc[i], COEFF_TOKEN_VLC_BITS, 4*17,
 285                      &coeff_token_len [i][0], 1, 1,
 286                      &coeff_token_bits[i][0], 1, 1,
 287                      INIT_VLC_USE_NEW_STATIC);
 288             offset += coeff_token_vlc_tables_size[i];
 289         }
 290         /*
 291          * This is a one time safety check to make sure that
 292          * the packed static coeff_token_vlc table sizes
 293          * were initialized correctly.
 294          */
 295         assert(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));
 296
 297         for(i=0; i<3; i++){
 298             chroma_dc_total_zeros_vlc[i].table = chroma_dc_total_zeros_vlc_tables[i];
 299             chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;
 300             init_vlc(&chroma_dc_total_zeros_vlc[i],
 301                      CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,
 302                      &chroma_dc_total_zeros_len [i][0], 1, 1,
 303                      &chroma_dc_total_zeros_bits[i][0], 1, 1,
 304                      INIT_VLC_USE_NEW_STATIC);
 305         }
 306         for(i=0; i<15; i++){
 307             total_zeros_vlc[i].table = total_zeros_vlc_tables[i];
 308             total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;
 309             init_vlc(&total_zeros_vlc[i],
 310                      TOTAL_ZEROS_VLC_BITS, 16,
 311                      &total_zeros_len [i][0], 1, 1,
 312                      &total_zeros_bits[i][0], 1, 1,
 313                      INIT_VLC_USE_NEW_STATIC);
 314         }
 315
 316         for(i=0; i<6; i++){
 317             run_vlc[i].table = run_vlc_tables[i];
 318             run_vlc[i].table_allocated = run_vlc_tables_size;
 319             init_vlc(&run_vlc[i],
 320                      RUN_VLC_BITS, 7,
 321                      &run_len [i][0], 1, 1,
 322                      &run_bits[i][0], 1, 1,
 323                      INIT_VLC_USE_NEW_STATIC);
 324         }
 325         run7_vlc.table = run7_vlc_table,
 326         run7_vlc.table_allocated = run7_vlc_table_size;
 327         init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,
 328                  &run_len [6][0], 1, 1,
 329                  &run_bits[6][0], 1, 1,
 330                  INIT_VLC_USE_NEW_STATIC);
 331
 332         init_cavlc_level_tab();
 333     }
 334 }
 335
 336 /**
 337  *
 338  */
 339 static inline int get_level_prefix(GetBitContext *gb){
 340     unsigned int buf;
 341     int log;
 342
 343     OPEN_READER(re, gb);
 344     UPDATE_CACHE(re, gb);
 345     buf=GET_CACHE(re, gb);
 346
 347     log= 32 - av_log2(buf);
 348 #ifdef TRACE
 349     print_bin(buf>>(32-log), log);
 350     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__);
 351 #endif
 352
 353     LAST_SKIP_BITS(re, gb, log);
 354     CLOSE_READER(re, gb);
 355
 356     return log-1;
 357 }
 358
 359 /**
 360  * decodes a residual block.
 361  * @param n block index
 362  * @param scantable scantable
 363  * @param max_coeff number of coefficients in the block
 364  * @return <0 if an error occurred
 365  */
 366 static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff){
 367     MpegEncContext * const s = &h->s;
 368     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};
 369     int level[16];
 370     int zeros_left, coeff_token, total_coeff, i, trailing_ones, run_before;
 371
 372     //FIXME put trailing_onex into the context
 373
 374     if(n >= CHROMA_DC_BLOCK_INDEX){
 375         coeff_token= get_vlc2(gb, chroma_dc_coeff_token_vlc.table, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 1);
 376         total_coeff= coeff_token>>2;
 377     }else{
 378         if(n == LUMA_DC_BLOCK_INDEX){
 379             total_coeff= pred_non_zero_count(h, 0);
 380             coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);
 381             total_coeff= coeff_token>>2;
 382         }else{
 383             total_coeff= pred_non_zero_count(h, n);
 384             coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);
 385             total_coeff= coeff_token>>2;
 386         }
 387     }
 388     h->non_zero_count_cache[ scan8[n] ]= total_coeff;
 389
 390     //FIXME set last_non_zero?
 391
 392     if(total_coeff==0)
 393         return 0;
 394     if(total_coeff > (unsigned)max_coeff) {
 395         av_log(h->s.avctx, AV_LOG_ERROR, "corrupted macroblock %d %d (total_coeff=%d)\n", s->mb_x, s->mb_y, total_coeff);
 396         return -1;
 397     }
 398
 399     trailing_ones= coeff_token&3;
 400     tprintf(h->s.avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);
 401     assert(total_coeff<=16);
 402
 403     i = show_bits(gb, 3);
 404     skip_bits(gb, trailing_ones);
 405     level[0] = 1-((i&4)>>1);
 406     level[1] = 1-((i&2)   );
 407     level[2] = 1-((i&1)<<1);
 408
 409     if(trailing_ones<total_coeff) {
 410         int mask, prefix;
 411         int suffix_length = total_coeff > 10 & trailing_ones < 3;
 412         int bitsi= show_bits(gb, LEVEL_TAB_BITS);
 413         int level_code= cavlc_level_tab[suffix_length][bitsi][0];
 414
 415         skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);
 416         if(level_code >= 100){
 417             prefix= level_code - 100;
 418             if(prefix == LEVEL_TAB_BITS)
 419                 prefix += get_level_prefix(gb);
 420
 421             //first coefficient has suffix_length equal to 0 or 1
 422             if(prefix<14){ //FIXME try to build a large unified VLC table for all this
 423                 if(suffix_length)
 424                     level_code= (prefix<<1) + get_bits1(gb); //part
 425                 else
 426                     level_code= prefix; //part
 427             }else if(prefix==14){
 428                 if(suffix_length)
 429                     level_code= (prefix<<1) + get_bits1(gb); //part
 430                 else
 431                     level_code= prefix + get_bits(gb, 4); //part
 432             }else{
 433                 level_code= 30 + get_bits(gb, prefix-3); //part
 434                 if(prefix>=16){
 435                     if(prefix > 25+3){
 436                         av_log(h->s.avctx, AV_LOG_ERROR, "Invalid level prefix\n");
 437                         return -1;
 438                     }
 439                     level_code += (1<<(prefix-3))-4096;
 440                 }
 441             }
 442
 443             if(trailing_ones < 3) level_code += 2;
 444
 445             suffix_length = 2;
 446             mask= -(level_code&1);
 447             level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask;
 448         }else{
 449             level_code += ((level_code>>31)|1) & -(trailing_ones < 3);
 450
 451             suffix_length = 1 + (level_code + 3U > 6U);
 452             level[trailing_ones]= level_code;
 453         }
 454
 455         //remaining coefficients have suffix_length > 0
 456         for(i=trailing_ones+1;i<total_coeff;i++) {
 457             static const unsigned int suffix_limit[7] = {0,3,6,12,24,48,INT_MAX };
 458             int bitsi= show_bits(gb, LEVEL_TAB_BITS);
 459             level_code= cavlc_level_tab[suffix_length][bitsi][0];
 460
 461             skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);
 462             if(level_code >= 100){
 463                 prefix= level_code - 100;
 464                 if(prefix == LEVEL_TAB_BITS){
 465                     prefix += get_level_prefix(gb);
 466                 }
 467                 if(prefix<15){
 468                     level_code = (prefix<<suffix_length) + get_bits(gb, suffix_length);
 469                 }else{
 470                     level_code = (15<<suffix_length) + get_bits(gb, prefix-3);
 471                     if(prefix>=16)
 472                         level_code += (1<<(prefix-3))-4096;
 473                 }
 474                 mask= -(level_code&1);
 475                 level_code= (((2+level_code)>>1) ^ mask) - mask;
 476             }
 477             level[i]= level_code;
 478             suffix_length+= suffix_limit[suffix_length] + level_code > 2U*suffix_limit[suffix_length];
 479         }
 480     }
 481
 482     if(total_coeff == max_coeff)
 483         zeros_left=0;
 484     else{
 485         if(n >= CHROMA_DC_BLOCK_INDEX)
 486             zeros_left= get_vlc2(gb, (chroma_dc_total_zeros_vlc-1)[ total_coeff ].table, CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1);
 487         else
 488             zeros_left= get_vlc2(gb, (total_zeros_vlc-1)[ total_coeff ].table, TOTAL_ZEROS_VLC_BITS, 1);
 489     }
 490
 491 #define STORE_BLOCK(type) \
 492     scantable += zeros_left + total_coeff - 1; \
 493     if(n >= LUMA_DC_BLOCK_INDEX){ \
 494         ((type*)block)[*scantable] = level[0]; \
 495         for(i=1;i<total_coeff && zeros_left > 0;i++) { \
 496             if(zeros_left < 7) \
 497                 run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \
 498             else \
 499                 run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \
 500             zeros_left -= run_before; \
 501             scantable -= 1 + run_before; \
 502             ((type*)block)[*scantable]= level[i]; \
 503         } \
 504         for(;i<total_coeff;i++) { \
 505             scantable--; \
 506             ((type*)block)[*scantable]= level[i]; \
 507         } \
 508     }else{ \
 509         ((type*)block)[*scantable] = ((int)(level[0] * qmul[*scantable] + 32))>>6; \
 510         for(i=1;i<total_coeff && zeros_left > 0;i++) { \
 511             if(zeros_left < 7) \
 512                 run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \
 513             else \
 514                 run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \
 515             zeros_left -= run_before; \
 516             scantable -= 1 + run_before; \
 517             ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \
 518         } \
 519         for(;i<total_coeff;i++) { \
 520             scantable--; \
 521             ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \
 522         } \
 523     }
 524
 525     if (h->pixel_shift) {
 526         STORE_BLOCK(int32_t)
 527     } else {
 528         STORE_BLOCK(int16_t)
 529     }
 530
 531     if(zeros_left<0){
 532         av_log(h->s.avctx, AV_LOG_ERROR, "negative number of zero coeffs at %d %d\n", s->mb_x, s->mb_y);
 533         return -1;
 534     }
 535
 536     return 0;
 537 }
 538
 539 int ff_h264_decode_mb_cavlc(H264Context *h){
 540     MpegEncContext * const s = &h->s;
 541     int mb_xy;
 542     int partition_count;
 543     unsigned int mb_type, cbp;
 544     int dct8x8_allowed= h->pps.transform_8x8_mode;
 545
 546     mb_xy = h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;
 547
 548     tprintf(s->avctx, "pic:%d mb:%d/%d\n", h->frame_num, s->mb_x, s->mb_y);
 549     cbp = 0; /* avoid warning. FIXME: find a solution without slowing
 550                 down the code */
 551     if(h->slice_type_nos != AV_PICTURE_TYPE_I){
 552         if(s->mb_skip_run==-1)
 553             s->mb_skip_run= get_ue_golomb(&s->gb);
 554
 555         if (s->mb_skip_run--) {
 556             if(FRAME_MBAFF && (s->mb_y&1) == 0){
 557                 if(s->mb_skip_run==0)
 558                     h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&s->gb);
 559             }
 560             decode_mb_skip(h);
 561             return 0;
 562         }
 563     }
 564     if(FRAME_MBAFF){
 565         if( (s->mb_y&1) == 0 )
 566             h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&s->gb);
 567     }
 568
 569     h->prev_mb_skipped= 0;
 570
 571     mb_type= get_ue_golomb(&s->gb);
 572     if(h->slice_type_nos == AV_PICTURE_TYPE_B){
 573         if(mb_type < 23){
 574             partition_count= b_mb_type_info[mb_type].partition_count;
 575             mb_type=         b_mb_type_info[mb_type].type;
 576         }else{
 577             mb_type -= 23;
 578             goto decode_intra_mb;
 579         }
 580     }else if(h->slice_type_nos == AV_PICTURE_TYPE_P){
 581         if(mb_type < 5){
 582             partition_count= p_mb_type_info[mb_type].partition_count;
 583             mb_type=         p_mb_type_info[mb_type].type;
 584         }else{
 585             mb_type -= 5;
 586             goto decode_intra_mb;
 587         }
 588     }else{
 589        assert(h->slice_type_nos == AV_PICTURE_TYPE_I);
 590         if(h->slice_type == AV_PICTURE_TYPE_SI && mb_type)
 591             mb_type--;
 592 decode_intra_mb:
 593         if(mb_type > 25){
 594             av_log(h->s.avctx, AV_LOG_ERROR, "mb_type %d in %c slice too large at %d %d\n", mb_type, av_get_picture_type_char(h->slice_type), s->mb_x, s->mb_y);
 595             return -1;
 596         }
 597         partition_count=0;
 598         cbp= i_mb_type_info[mb_type].cbp;
 599         h->intra16x16_pred_mode= i_mb_type_info[mb_type].pred_mode;
 600         mb_type= i_mb_type_info[mb_type].type;
 601     }
 602
 603     if(MB_FIELD)
 604         mb_type |= MB_TYPE_INTERLACED;
 605
 606     h->slice_table[ mb_xy ]= h->slice_num;
 607
 608     if(IS_INTRA_PCM(mb_type)){
 609         unsigned int x;
 610
 611         // We assume these blocks are very rare so we do not optimize it.
 612         align_get_bits(&s->gb);
 613
 614         // The pixels are stored in the same order as levels in h->mb array.
 615         for(x=0; x < (CHROMA ? 384 : 256)*h->sps.bit_depth_luma/8; x++){
 616             ((uint8_t*)h->mb)[x]= get_bits(&s->gb, 8);
 617         }
 618
 619         // In deblocking, the quantizer is 0
 620         s->current_picture.qscale_table[mb_xy]= 0;
 621         // All coeffs are present
 622         memset(h->non_zero_count[mb_xy], 16, 32);
 623
 624         s->current_picture.mb_type[mb_xy]= mb_type;
 625         return 0;
 626     }
 627
 628     if(MB_MBAFF){
 629         h->ref_count[0] <<= 1;
 630         h->ref_count[1] <<= 1;
 631     }
 632
 633     fill_decode_neighbors(h, mb_type);
 634     fill_decode_caches(h, mb_type);
 635
 636     //mb_pred
 637     if(IS_INTRA(mb_type)){
 638         int pred_mode;
 639 //            init_top_left_availability(h);
 640         if(IS_INTRA4x4(mb_type)){
 641             int i;
 642             int di = 1;
 643             if(dct8x8_allowed && get_bits1(&s->gb)){
 644                 mb_type |= MB_TYPE_8x8DCT;
 645                 di = 4;
 646             }
 647
 648 //                fill_intra4x4_pred_table(h);
 649             for(i=0; i<16; i+=di){
 650                 int mode= pred_intra_mode(h, i);
 651
 652                 if(!get_bits1(&s->gb)){
 653                     const int rem_mode= get_bits(&s->gb, 3);
 654                     mode = rem_mode + (rem_mode >= mode);
 655                 }
 656
 657                 if(di==4)
 658                     fill_rectangle( &h->intra4x4_pred_mode_cache[ scan8[i] ], 2, 2, 8, mode, 1 );
 659                 else
 660                     h->intra4x4_pred_mode_cache[ scan8[i] ] = mode;
 661             }
 662             ff_h264_write_back_intra_pred_mode(h);
 663             if( ff_h264_check_intra4x4_pred_mode(h) < 0)
 664                 return -1;
 665         }else{
 666             h->intra16x16_pred_mode= ff_h264_check_intra_pred_mode(h, h->intra16x16_pred_mode);
 667             if(h->intra16x16_pred_mode < 0)
 668                 return -1;
 669         }
 670         if(CHROMA){
 671             pred_mode= ff_h264_check_intra_pred_mode(h, get_ue_golomb_31(&s->gb));
 672             if(pred_mode < 0)
 673                 return -1;
 674             h->chroma_pred_mode= pred_mode;
 675         } else {
 676             h->chroma_pred_mode = DC_128_PRED8x8;
 677         }
 678     }else if(partition_count==4){
 679         int i, j, sub_partition_count[4], list, ref[2][4];
 680
 681         if(h->slice_type_nos == AV_PICTURE_TYPE_B){
 682             for(i=0; i<4; i++){
 683                 h->sub_mb_type[i]= get_ue_golomb_31(&s->gb);
 684                 if(h->sub_mb_type[i] >=13){
 685                     av_log(h->s.avctx, AV_LOG_ERROR, "B sub_mb_type %u out of range at %d %d\n", h->sub_mb_type[i], s->mb_x, s->mb_y);
 686                     return -1;
 687                 }
 688                 sub_partition_count[i]= b_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;
 689                 h->sub_mb_type[i]=      b_sub_mb_type_info[ h->sub_mb_type[i] ].type;
 690             }
 691             if( IS_DIRECT(h->sub_mb_type[0]|h->sub_mb_type[1]|h->sub_mb_type[2]|h->sub_mb_type[3])) {
 692                 ff_h264_pred_direct_motion(h, &mb_type);
 693                 h->ref_cache[0][scan8[4]] =
 694                 h->ref_cache[1][scan8[4]] =
 695                 h->ref_cache[0][scan8[12]] =
 696                 h->ref_cache[1][scan8[12]] = PART_NOT_AVAILABLE;
 697             }
 698         }else{
 699             assert(h->slice_type_nos == AV_PICTURE_TYPE_P); //FIXME SP correct ?
 700             for(i=0; i<4; i++){
 701                 h->sub_mb_type[i]= get_ue_golomb_31(&s->gb);
 702                 if(h->sub_mb_type[i] >=4){
 703                     av_log(h->s.avctx, AV_LOG_ERROR, "P sub_mb_type %u out of range at %d %d\n", h->sub_mb_type[i], s->mb_x, s->mb_y);
 704                     return -1;
 705                 }
 706                 sub_partition_count[i]= p_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;
 707                 h->sub_mb_type[i]=      p_sub_mb_type_info[ h->sub_mb_type[i] ].type;
 708             }
 709         }
 710
 711         for(list=0; list<h->list_count; list++){
 712             int ref_count= IS_REF0(mb_type) ? 1 : h->ref_count[list];
 713             for(i=0; i<4; i++){
 714                 if(IS_DIRECT(h->sub_mb_type[i])) continue;
 715                 if(IS_DIR(h->sub_mb_type[i], 0, list)){
 716                     unsigned int tmp;
 717                     if(ref_count == 1){
 718                         tmp= 0;
 719                     }else if(ref_count == 2){
 720                         tmp= get_bits1(&s->gb)^1;
 721                     }else{
 722                         tmp= get_ue_golomb_31(&s->gb);
 723                         if(tmp>=ref_count){
 724                             av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", tmp);
 725                             return -1;
 726                         }
 727                     }
 728                     ref[list][i]= tmp;
 729                 }else{
 730                  //FIXME
 731                     ref[list][i] = -1;
 732                 }
 733             }
 734         }
 735
 736         if(dct8x8_allowed)
 737             dct8x8_allowed = get_dct8x8_allowed(h);
 738
 739         for(list=0; list<h->list_count; list++){
 740             for(i=0; i<4; i++){
 741                 if(IS_DIRECT(h->sub_mb_type[i])) {
 742                     h->ref_cache[list][ scan8[4*i] ] = h->ref_cache[list][ scan8[4*i]+1 ];
 743                     continue;
 744                 }
 745                 h->ref_cache[list][ scan8[4*i]   ]=h->ref_cache[list][ scan8[4*i]+1 ]=
 746                 h->ref_cache[list][ scan8[4*i]+8 ]=h->ref_cache[list][ scan8[4*i]+9 ]= ref[list][i];
 747
 748                 if(IS_DIR(h->sub_mb_type[i], 0, list)){
 749                     const int sub_mb_type= h->sub_mb_type[i];
 750                     const int block_width= (sub_mb_type & (MB_TYPE_16x16|MB_TYPE_16x8)) ? 2 : 1;
 751                     for(j=0; j<sub_partition_count[i]; j++){
 752                         int mx, my;
 753                         const int index= 4*i + block_width*j;
 754                         int16_t (* mv_cache)[2]= &h->mv_cache[list][ scan8[index] ];
 755                         pred_motion(h, index, block_width, list, h->ref_cache[list][ scan8[index] ], &mx, &my);
 756                         mx += get_se_golomb(&s->gb);
 757                         my += get_se_golomb(&s->gb);
 758                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);
 759
 760                         if(IS_SUB_8X8(sub_mb_type)){
 761                             mv_cache[ 1 ][0]=
 762                             mv_cache[ 8 ][0]= mv_cache[ 9 ][0]= mx;
 763                             mv_cache[ 1 ][1]=
 764                             mv_cache[ 8 ][1]= mv_cache[ 9 ][1]= my;
 765                         }else if(IS_SUB_8X4(sub_mb_type)){
 766                             mv_cache[ 1 ][0]= mx;
 767                             mv_cache[ 1 ][1]= my;
 768                         }else if(IS_SUB_4X8(sub_mb_type)){
 769                             mv_cache[ 8 ][0]= mx;
 770                             mv_cache[ 8 ][1]= my;
 771                         }
 772                         mv_cache[ 0 ][0]= mx;
 773                         mv_cache[ 0 ][1]= my;
 774                     }
 775                 }else{
 776                     uint32_t *p= (uint32_t *)&h->mv_cache[list][ scan8[4*i] ][0];
 777                     p[0] = p[1]=
 778                     p[8] = p[9]= 0;
 779                 }
 780             }
 781         }
 782     }else if(IS_DIRECT(mb_type)){
 783         ff_h264_pred_direct_motion(h, &mb_type);
 784         dct8x8_allowed &= h->sps.direct_8x8_inference_flag;
 785     }else{
 786         int list, mx, my, i;
 787          //FIXME we should set ref_idx_l? to 0 if we use that later ...
 788         if(IS_16X16(mb_type)){
 789             for(list=0; list<h->list_count; list++){
 790                     unsigned int val;
 791                     if(IS_DIR(mb_type, 0, list)){
 792                         if(h->ref_count[list]==1){
 793                             val= 0;
 794                         }else if(h->ref_count[list]==2){
 795                             val= get_bits1(&s->gb)^1;
 796                         }else{
 797                             val= get_ue_golomb_31(&s->gb);
 798                             if(val >= h->ref_count[list]){
 799                                 av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
 800                                 return -1;
 801                             }
 802                         }
 803                     fill_rectangle(&h->ref_cache[list][ scan8[0] ], 4, 4, 8, val, 1);
 804                     }
 805             }
 806             for(list=0; list<h->list_count; list++){
 807                 if(IS_DIR(mb_type, 0, list)){
 808                     pred_motion(h, 0, 4, list, h->ref_cache[list][ scan8[0] ], &mx, &my);
 809                     mx += get_se_golomb(&s->gb);
 810                     my += get_se_golomb(&s->gb);
 811                     tprintf(s->avctx, "final mv:%d %d\n", mx, my);
 812
 813                     fill_rectangle(h->mv_cache[list][ scan8[0] ], 4, 4, 8, pack16to32(mx,my), 4);
 814                 }
 815             }
 816         }
 817         else if(IS_16X8(mb_type)){
 818             for(list=0; list<h->list_count; list++){
 819                     for(i=0; i<2; i++){
 820                         unsigned int val;
 821                         if(IS_DIR(mb_type, i, list)){
 822                             if(h->ref_count[list] == 1){
 823                                 val= 0;
 824                             }else if(h->ref_count[list] == 2){
 825                                 val= get_bits1(&s->gb)^1;
 826                             }else{
 827                                 val= get_ue_golomb_31(&s->gb);
 828                                 if(val >= h->ref_count[list]){
 829                                     av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
 830                                     return -1;
 831                                 }
 832                             }
 833                         }else
 834                             val= LIST_NOT_USED&0xFF;
 835                         fill_rectangle(&h->ref_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 1);
 836                     }
 837             }
 838             for(list=0; list<h->list_count; list++){
 839                 for(i=0; i<2; i++){
 840                     unsigned int val;
 841                     if(IS_DIR(mb_type, i, list)){
 842                         pred_16x8_motion(h, 8*i, list, h->ref_cache[list][scan8[0] + 16*i], &mx, &my);
 843                         mx += get_se_golomb(&s->gb);
 844                         my += get_se_golomb(&s->gb);
 845                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);
 846
 847                         val= pack16to32(mx,my);
 848                     }else
 849                         val=0;
 850                     fill_rectangle(h->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);
 851                 }
 852             }
 853         }else{
 854             assert(IS_8X16(mb_type));
 855             for(list=0; list<h->list_count; list++){
 856                     for(i=0; i<2; i++){
 857                         unsigned int val;
 858                         if(IS_DIR(mb_type, i, list)){ //FIXME optimize
 859                             if(h->ref_count[list]==1){
 860                                 val= 0;
 861                             }else if(h->ref_count[list]==2){
 862                                 val= get_bits1(&s->gb)^1;
 863                             }else{
 864                                 val= get_ue_golomb_31(&s->gb);
 865                                 if(val >= h->ref_count[list]){
 866                                     av_log(h->s.avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
 867                                     return -1;
 868                                 }
 869                             }
 870                         }else
 871                             val= LIST_NOT_USED&0xFF;
 872                         fill_rectangle(&h->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);
 873                     }
 874             }
 875             for(list=0; list<h->list_count; list++){
 876                 for(i=0; i<2; i++){
 877                     unsigned int val;
 878                     if(IS_DIR(mb_type, i, list)){
 879                         pred_8x16_motion(h, i*4, list, h->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);
 880                         mx += get_se_golomb(&s->gb);
 881                         my += get_se_golomb(&s->gb);
 882                         tprintf(s->avctx, "final mv:%d %d\n", mx, my);
 883
 884                         val= pack16to32(mx,my);
 885                     }else
 886                         val=0;
 887                     fill_rectangle(h->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);
 888                 }
 889             }
 890         }
 891     }
 892
 893     if(IS_INTER(mb_type))
 894         write_back_motion(h, mb_type);
 895
 896     if(!IS_INTRA16x16(mb_type)){
 897         cbp= get_ue_golomb(&s->gb);
 898         if(cbp > 47){
 899             av_log(h->s.avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, s->mb_x, s->mb_y);
 900             return -1;
 901         }
 902
 903         if(CHROMA){
 904             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp[cbp];
 905             else                     cbp= golomb_to_inter_cbp   [cbp];
 906         }else{
 907             if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];
 908             else                     cbp= golomb_to_inter_cbp_gray[cbp];
 909         }
 910     }
 911
 912     if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){
 913         mb_type |= MB_TYPE_8x8DCT*get_bits1(&s->gb);
 914     }
 915     h->cbp=
 916     h->cbp_table[mb_xy]= cbp;
 917     s->current_picture.mb_type[mb_xy]= mb_type;
 918
 919     if(cbp || IS_INTRA16x16(mb_type)){
 920         int i8x8, i4x4, chroma_idx;
 921         int dquant;
 922         GetBitContext *gb= IS_INTRA(mb_type) ? h->intra_gb_ptr : h->inter_gb_ptr;
 923         const uint8_t *scan, *scan8x8;
 924         const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);
 925
 926         if(IS_INTERLACED(mb_type)){
 927             scan8x8= s->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;
 928             scan= s->qscale ? h->field_scan : h->field_scan_q0;
 929         }else{
 930             scan8x8= s->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;
 931             scan= s->qscale ? h->zigzag_scan : h->zigzag_scan_q0;
 932         }
 933
 934         dquant= get_se_golomb(&s->gb);
 935
 936         s->qscale += dquant;
 937
 938         if(((unsigned)s->qscale) > max_qp){
 939             if(s->qscale<0) s->qscale+= max_qp+1;
 940             else            s->qscale-= max_qp+1;
 941             if(((unsigned)s->qscale) > max_qp){
 942                 av_log(h->s.avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, s->mb_x, s->mb_y);
 943                 return -1;
 944             }
 945         }
 946
 947         h->chroma_qp[0]= get_chroma_qp(h, 0, s->qscale);
 948         h->chroma_qp[1]= get_chroma_qp(h, 1, s->qscale);
 949         if(IS_INTRA16x16(mb_type)){
 950             AV_ZERO128(h->mb_luma_dc+0);
 951             AV_ZERO128(h->mb_luma_dc+8);
 952             AV_ZERO128(h->mb_luma_dc+16);
 953             AV_ZERO128(h->mb_luma_dc+24);
 954             if( decode_residual(h, h->intra_gb_ptr, h->mb_luma_dc, LUMA_DC_BLOCK_INDEX, scan, h->dequant4_coeff[0][s->qscale], 16) < 0){
 955                 return -1; //FIXME continue if partitioned and other return -1 too
 956             }
 957
 958             assert((cbp&15) == 0 || (cbp&15) == 15);
 959
 960             if(cbp&15){
 961                 for(i8x8=0; i8x8<4; i8x8++){
 962                     for(i4x4=0; i4x4<4; i4x4++){
 963                         const int index= i4x4 + 4*i8x8;
 964                         if( decode_residual(h, h->intra_gb_ptr, h->mb + (16*index<<h->pixel_shift), index, scan + 1, h->dequant4_coeff[0][s->qscale], 15) < 0 ){
 965                             return -1;
 966                         }
 967                     }
 968                 }
 969             }else{
 970                 fill_rectangle(&h->non_zero_count_cache[scan8[0]], 4, 4, 8, 0, 1);
 971             }
 972         }else{
 973             for(i8x8=0; i8x8<4; i8x8++){
 974                 if(cbp & (1<<i8x8)){
 975                     if(IS_8x8DCT(mb_type)){
 976                         DCTELEM *buf = &h->mb[64*i8x8<<h->pixel_shift];
 977                         uint8_t *nnz;
 978                         for(i4x4=0; i4x4<4; i4x4++){
 979                             if( decode_residual(h, gb, buf, i4x4+4*i8x8, scan8x8+16*i4x4,
 980                                                 h->dequant8_coeff[IS_INTRA( mb_type ) ? 0:1][s->qscale], 16) <0 )
 981                                 return -1;
 982                         }
 983                         nnz= &h->non_zero_count_cache[ scan8[4*i8x8] ];
 984                         nnz[0] += nnz[1] + nnz[8] + nnz[9];
 985                     }else{
 986                         for(i4x4=0; i4x4<4; i4x4++){
 987                             const int index= i4x4 + 4*i8x8;
 988
 989                             if( decode_residual(h, gb, h->mb + (16*index<<h->pixel_shift), index, scan, h->dequant4_coeff[IS_INTRA( mb_type ) ? 0:3][s->qscale], 16) <0 ){
 990                                 return -1;
 991                             }
 992                         }
 993                     }
 994                 }else{
 995                     uint8_t * const nnz= &h->non_zero_count_cache[ scan8[4*i8x8] ];
 996                     nnz[0] = nnz[1] = nnz[8] = nnz[9] = 0;
 997                 }
 998             }
 999         }
1000
1001         if(cbp&0x30){
1002             for(chroma_idx=0; chroma_idx<2; chroma_idx++)
1003                 if( decode_residual(h, gb, h->mb + ((256 + 16*4*chroma_idx)<<h->pixel_shift), CHROMA_DC_BLOCK_INDEX+chroma_idx, chroma_dc_scan, NULL, 4) < 0){
1004                     return -1;
1005                 }
1006         }
1007
1008         if(cbp&0x20){
1009             for(chroma_idx=0; chroma_idx<2; chroma_idx++){
1010                 const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][h->chroma_qp[chroma_idx]];
1011                 for(i4x4=0; i4x4<4; i4x4++){
1012                     const int index= 16 + 4*chroma_idx + i4x4;
1013                     if( decode_residual(h, gb, h->mb + (16*index<<h->pixel_shift), index, scan + 1, qmul, 15) < 0){
1014                         return -1;
1015                     }
1016                 }
1017             }
1018         }else{
1019             uint8_t * const nnz= &h->non_zero_count_cache[0];
1020             nnz[ scan8[16]+0 ] = nnz[ scan8[16]+1 ] =nnz[ scan8[16]+8 ] =nnz[ scan8[16]+9 ] =
1021             nnz[ scan8[20]+0 ] = nnz[ scan8[20]+1 ] =nnz[ scan8[20]+8 ] =nnz[ scan8[20]+9 ] = 0;
1022         }
1023     }else{
1024         uint8_t * const nnz= &h->non_zero_count_cache[0];
1025         fill_rectangle(&nnz[scan8[0]], 4, 4, 8, 0, 1);
1026         nnz[ scan8[16]+0 ] = nnz[ scan8[16]+1 ] =nnz[ scan8[16]+8 ] =nnz[ scan8[16]+9 ] =
1027         nnz[ scan8[20]+0 ] = nnz[ scan8[20]+1 ] =nnz[ scan8[20]+8 ] =nnz[ scan8[20]+9 ] = 0;
1028     }
1029     s->current_picture.qscale_table[mb_xy]= s->qscale;
1030     write_back_non_zero_count(h);
1031
1032     if(MB_MBAFF){
1033         h->ref_count[0] >>= 1;
1034         h->ref_count[1] >>= 1;
1035     }
1036
1037     return 0;
1038 }
1039