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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, int n){
288  const int index8= scan8[n];
289  const int left= h->non_zero_count_cache[index8 - 1];
290  const int top = h->non_zero_count_cache[index8 - 8];
291  int i= left + top;
292 
293  if(i<64) i= (i+1)>>1;
294 
295  tprintf(h->avctx, "pred_nnz L%X T%X n%d s%d P%X\n", left, top, n, scan8[n], i&31);
296 
297  return i&31;
298 }
299 
300 static av_cold void init_cavlc_level_tab(void){
301  int suffix_length;
302  unsigned int i;
303 
304  for(suffix_length=0; suffix_length<7; suffix_length++){
305  for(i=0; i<(1<<LEVEL_TAB_BITS); i++){
306  int prefix= LEVEL_TAB_BITS - av_log2(2*i);
307 
308  if(prefix + 1 + suffix_length <= LEVEL_TAB_BITS){
309  int level_code = (prefix << suffix_length) +
310  (i >> (av_log2(i) - suffix_length)) - (1 << suffix_length);
311  int mask = -(level_code&1);
312  level_code = (((2 + level_code) >> 1) ^ mask) - mask;
313  cavlc_level_tab[suffix_length][i][0]= level_code;
314  cavlc_level_tab[suffix_length][i][1]= prefix + 1 + suffix_length;
315  }else if(prefix + 1 <= LEVEL_TAB_BITS){
316  cavlc_level_tab[suffix_length][i][0]= prefix+100;
317  cavlc_level_tab[suffix_length][i][1]= prefix + 1;
318  }else{
319  cavlc_level_tab[suffix_length][i][0]= LEVEL_TAB_BITS+100;
320  cavlc_level_tab[suffix_length][i][1]= LEVEL_TAB_BITS;
321  }
322  }
323  }
324 }
325 
326 av_cold void ff_h264_decode_init_vlc(void){
327  static int done = 0;
328 
329  if (!done) {
330  int i;
331  int offset;
332  done = 1;
333 
334  chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;
335  chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;
336  init_vlc(&chroma_dc_coeff_token_vlc, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 4*5,
337  &chroma_dc_coeff_token_len [0], 1, 1,
338  &chroma_dc_coeff_token_bits[0], 1, 1,
339  INIT_VLC_USE_NEW_STATIC);
340 
341  chroma422_dc_coeff_token_vlc.table = chroma422_dc_coeff_token_vlc_table;
342  chroma422_dc_coeff_token_vlc.table_allocated = chroma422_dc_coeff_token_vlc_table_size;
343  init_vlc(&chroma422_dc_coeff_token_vlc, CHROMA422_DC_COEFF_TOKEN_VLC_BITS, 4*9,
344  &chroma422_dc_coeff_token_len [0], 1, 1,
345  &chroma422_dc_coeff_token_bits[0], 1, 1,
346  INIT_VLC_USE_NEW_STATIC);
347 
348  offset = 0;
349  for(i=0; i<4; i++){
350  coeff_token_vlc[i].table = coeff_token_vlc_tables+offset;
351  coeff_token_vlc[i].table_allocated = coeff_token_vlc_tables_size[i];
352  init_vlc(&coeff_token_vlc[i], COEFF_TOKEN_VLC_BITS, 4*17,
353  &coeff_token_len [i][0], 1, 1,
354  &coeff_token_bits[i][0], 1, 1,
355  INIT_VLC_USE_NEW_STATIC);
356  offset += coeff_token_vlc_tables_size[i];
357  }
358  /*
359  * This is a one time safety check to make sure that
360  * the packed static coeff_token_vlc table sizes
361  * were initialized correctly.
362  */
363  av_assert0(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));
364 
365  for(i=0; i<3; i++){
366  chroma_dc_total_zeros_vlc[i].table = chroma_dc_total_zeros_vlc_tables[i];
367  chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;
368  init_vlc(&chroma_dc_total_zeros_vlc[i],
369  CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,
370  &chroma_dc_total_zeros_len [i][0], 1, 1,
371  &chroma_dc_total_zeros_bits[i][0], 1, 1,
372  INIT_VLC_USE_NEW_STATIC);
373  }
374 
375  for(i=0; i<7; i++){
376  chroma422_dc_total_zeros_vlc[i].table = chroma422_dc_total_zeros_vlc_tables[i];
377  chroma422_dc_total_zeros_vlc[i].table_allocated = chroma422_dc_total_zeros_vlc_tables_size;
378  init_vlc(&chroma422_dc_total_zeros_vlc[i],
379  CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 8,
380  &chroma422_dc_total_zeros_len [i][0], 1, 1,
381  &chroma422_dc_total_zeros_bits[i][0], 1, 1,
382  INIT_VLC_USE_NEW_STATIC);
383  }
384 
385  for(i=0; i<15; i++){
386  total_zeros_vlc[i].table = total_zeros_vlc_tables[i];
387  total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;
388  init_vlc(&total_zeros_vlc[i],
389  TOTAL_ZEROS_VLC_BITS, 16,
390  &total_zeros_len [i][0], 1, 1,
391  &total_zeros_bits[i][0], 1, 1,
392  INIT_VLC_USE_NEW_STATIC);
393  }
394 
395  for(i=0; i<6; i++){
396  run_vlc[i].table = run_vlc_tables[i];
397  run_vlc[i].table_allocated = run_vlc_tables_size;
398  init_vlc(&run_vlc[i],
399  RUN_VLC_BITS, 7,
400  &run_len [i][0], 1, 1,
401  &run_bits[i][0], 1, 1,
402  INIT_VLC_USE_NEW_STATIC);
403  }
404  run7_vlc.table = run7_vlc_table,
405  run7_vlc.table_allocated = run7_vlc_table_size;
406  init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,
407  &run_len [6][0], 1, 1,
408  &run_bits[6][0], 1, 1,
409  INIT_VLC_USE_NEW_STATIC);
410 
411  init_cavlc_level_tab();
412  }
413 }
414 
415 /**
416  *
417  */
418 static inline int get_level_prefix(GetBitContext *gb){
419  unsigned int buf;
420  int log;
421 
422  OPEN_READER(re, gb);
423  UPDATE_CACHE(re, gb);
424  buf=GET_CACHE(re, gb);
425 
426  log= 32 - av_log2(buf);
427 #ifdef TRACE
428  print_bin(buf>>(32-log), log);
429  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__);
430 #endif
431 
432  LAST_SKIP_BITS(re, gb, log);
433  CLOSE_READER(re, gb);
434 
435  return log-1;
436 }
437 
438 /**
439  * Decode a residual block.
440  * @param n block index
441  * @param scantable scantable
442  * @param max_coeff number of coefficients in the block
443  * @return <0 if an error occurred
444  */
445 static int decode_residual(H264Context *h, GetBitContext *gb, int16_t *block, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff){
446  static const int coeff_token_table_index[17]= {0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3};
447  int level[16];
448  int zeros_left, coeff_token, total_coeff, i, trailing_ones, run_before;
449 
450  //FIXME put trailing_onex into the context
451 
452  if(max_coeff <= 8){
453  if (max_coeff == 4)
454  coeff_token = get_vlc2(gb, chroma_dc_coeff_token_vlc.table, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 1);
455  else
456  coeff_token = get_vlc2(gb, chroma422_dc_coeff_token_vlc.table, CHROMA422_DC_COEFF_TOKEN_VLC_BITS, 1);
457  total_coeff= coeff_token>>2;
458  }else{
459  if(n >= LUMA_DC_BLOCK_INDEX){
460  total_coeff= pred_non_zero_count(h, (n - LUMA_DC_BLOCK_INDEX)*16);
461  coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);
462  total_coeff= coeff_token>>2;
463  }else{
464  total_coeff= pred_non_zero_count(h, n);
465  coeff_token= get_vlc2(gb, coeff_token_vlc[ coeff_token_table_index[total_coeff] ].table, COEFF_TOKEN_VLC_BITS, 2);
466  total_coeff= coeff_token>>2;
467  }
468  }
469  h->non_zero_count_cache[ scan8[n] ]= total_coeff;
470 
471  //FIXME set last_non_zero?
472 
473  if(total_coeff==0)
474  return 0;
475  if(total_coeff > (unsigned)max_coeff) {
476  av_log(h->avctx, AV_LOG_ERROR, "corrupted macroblock %d %d (total_coeff=%d)\n", h->mb_x, h->mb_y, total_coeff);
477  return -1;
478  }
479 
480  trailing_ones= coeff_token&3;
481  tprintf(h->avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);
482  av_assert2(total_coeff<=16);
483 
484  i = show_bits(gb, 3);
485  skip_bits(gb, trailing_ones);
486  level[0] = 1-((i&4)>>1);
487  level[1] = 1-((i&2) );
488  level[2] = 1-((i&1)<<1);
489 
490  if(trailing_ones<total_coeff) {
491  int mask, prefix;
492  int suffix_length = total_coeff > 10 & trailing_ones < 3;
493  int bitsi= show_bits(gb, LEVEL_TAB_BITS);
494  int level_code= cavlc_level_tab[suffix_length][bitsi][0];
495 
496  skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);
497  if(level_code >= 100){
498  prefix= level_code - 100;
499  if(prefix == LEVEL_TAB_BITS)
500  prefix += get_level_prefix(gb);
501 
502  //first coefficient has suffix_length equal to 0 or 1
503  if(prefix<14){ //FIXME try to build a large unified VLC table for all this
504  if(suffix_length)
505  level_code= (prefix<<1) + get_bits1(gb); //part
506  else
507  level_code= prefix; //part
508  }else if(prefix==14){
509  if(suffix_length)
510  level_code= (prefix<<1) + get_bits1(gb); //part
511  else
512  level_code= prefix + get_bits(gb, 4); //part
513  }else{
514  level_code= 30;
515  if(prefix>=16){
516  if(prefix > 25+3){
517  av_log(h->avctx, AV_LOG_ERROR, "Invalid level prefix\n");
518  return -1;
519  }
520  level_code += (1<<(prefix-3))-4096;
521  }
522  level_code += get_bits(gb, prefix-3); //part
523  }
524 
525  if(trailing_ones < 3) level_code += 2;
526 
527  suffix_length = 2;
528  mask= -(level_code&1);
529  level[trailing_ones]= (((2+level_code)>>1) ^ mask) - mask;
530  }else{
531  level_code += ((level_code>>31)|1) & -(trailing_ones < 3);
532 
533  suffix_length = 1 + (level_code + 3U > 6U);
534  level[trailing_ones]= level_code;
535  }
536 
537  //remaining coefficients have suffix_length > 0
538  for(i=trailing_ones+1;i<total_coeff;i++) {
539  static const unsigned int suffix_limit[7] = {0,3,6,12,24,48,INT_MAX };
540  int bitsi= show_bits(gb, LEVEL_TAB_BITS);
541  level_code= cavlc_level_tab[suffix_length][bitsi][0];
542 
543  skip_bits(gb, cavlc_level_tab[suffix_length][bitsi][1]);
544  if(level_code >= 100){
545  prefix= level_code - 100;
546  if(prefix == LEVEL_TAB_BITS){
547  prefix += get_level_prefix(gb);
548  }
549  if(prefix<15){
550  level_code = (prefix<<suffix_length) + get_bits(gb, suffix_length);
551  }else{
552  level_code = 15<<suffix_length;
553  if (prefix>=16) {
554  if(prefix > 25+3){
555  av_log(h->avctx, AV_LOG_ERROR, "Invalid level prefix\n");
556  return AVERROR_INVALIDDATA;
557  }
558  level_code += (1<<(prefix-3))-4096;
559  }
560  level_code += get_bits(gb, prefix-3);
561  }
562  mask= -(level_code&1);
563  level_code= (((2+level_code)>>1) ^ mask) - mask;
564  }
565  level[i]= level_code;
566  suffix_length+= suffix_limit[suffix_length] + level_code > 2U*suffix_limit[suffix_length];
567  }
568  }
569 
570  if(total_coeff == max_coeff)
571  zeros_left=0;
572  else{
573  if (max_coeff <= 8) {
574  if (max_coeff == 4)
575  zeros_left = get_vlc2(gb, (chroma_dc_total_zeros_vlc-1)[total_coeff].table,
576  CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1);
577  else
578  zeros_left = get_vlc2(gb, (chroma422_dc_total_zeros_vlc-1)[total_coeff].table,
579  CHROMA422_DC_TOTAL_ZEROS_VLC_BITS, 1);
580  } else {
581  zeros_left= get_vlc2(gb, (total_zeros_vlc-1)[ total_coeff ].table, TOTAL_ZEROS_VLC_BITS, 1);
582  }
583  }
584 
585 #define STORE_BLOCK(type) \
586  scantable += zeros_left + total_coeff - 1; \
587  if(n >= LUMA_DC_BLOCK_INDEX){ \
588  ((type*)block)[*scantable] = level[0]; \
589  for(i=1;i<total_coeff && zeros_left > 0;i++) { \
590  if(zeros_left < 7) \
591  run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \
592  else \
593  run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \
594  zeros_left -= run_before; \
595  scantable -= 1 + run_before; \
596  ((type*)block)[*scantable]= level[i]; \
597  } \
598  for(;i<total_coeff;i++) { \
599  scantable--; \
600  ((type*)block)[*scantable]= level[i]; \
601  } \
602  }else{ \
603  ((type*)block)[*scantable] = ((int)(level[0] * qmul[*scantable] + 32))>>6; \
604  for(i=1;i<total_coeff && zeros_left > 0;i++) { \
605  if(zeros_left < 7) \
606  run_before= get_vlc2(gb, (run_vlc-1)[zeros_left].table, RUN_VLC_BITS, 1); \
607  else \
608  run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2); \
609  zeros_left -= run_before; \
610  scantable -= 1 + run_before; \
611  ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \
612  } \
613  for(;i<total_coeff;i++) { \
614  scantable--; \
615  ((type*)block)[*scantable]= ((int)(level[i] * qmul[*scantable] + 32))>>6; \
616  } \
617  }
618 
619  if (h->pixel_shift) {
620  STORE_BLOCK(int32_t)
621  } else {
622  STORE_BLOCK(int16_t)
623  }
624 
625  if(zeros_left<0){
626  av_log(h->avctx, AV_LOG_ERROR, "negative number of zero coeffs at %d %d\n", h->mb_x, h->mb_y);
627  return -1;
628  }
629 
630  return 0;
631 }
632 
633 static av_always_inline int decode_luma_residual(H264Context *h, GetBitContext *gb, const uint8_t *scan, const uint8_t *scan8x8, int pixel_shift, int mb_type, int cbp, int p){
634  int i4x4, i8x8;
635  int qscale = p == 0 ? h->qscale : h->chroma_qp[p-1];
636  if(IS_INTRA16x16(mb_type)){
637  AV_ZERO128(h->mb_luma_dc[p]+0);
638  AV_ZERO128(h->mb_luma_dc[p]+8);
639  AV_ZERO128(h->mb_luma_dc[p]+16);
640  AV_ZERO128(h->mb_luma_dc[p]+24);
641  if( decode_residual(h, h->intra_gb_ptr, h->mb_luma_dc[p], LUMA_DC_BLOCK_INDEX+p, scan, NULL, 16) < 0){
642  return -1; //FIXME continue if partitioned and other return -1 too
643  }
644 
645  av_assert2((cbp&15) == 0 || (cbp&15) == 15);
646 
647  if(cbp&15){
648  for(i8x8=0; i8x8<4; i8x8++){
649  for(i4x4=0; i4x4<4; i4x4++){
650  const int index= i4x4 + 4*i8x8 + p*16;
651  if( decode_residual(h, h->intra_gb_ptr, h->mb + (16*index << pixel_shift),
652  index, scan + 1, h->dequant4_coeff[p][qscale], 15) < 0 ){
653  return -1;
654  }
655  }
656  }
657  return 0xf;
658  }else{
659  fill_rectangle(&h->non_zero_count_cache[scan8[p*16]], 4, 4, 8, 0, 1);
660  return 0;
661  }
662  }else{
663  int cqm = (IS_INTRA( mb_type ) ? 0:3)+p;
664  /* For CAVLC 4:4:4, we need to keep track of the luma 8x8 CBP for deblocking nnz purposes. */
665  int new_cbp = 0;
666  for(i8x8=0; i8x8<4; i8x8++){
667  if(cbp & (1<<i8x8)){
668  if(IS_8x8DCT(mb_type)){
669  int16_t *buf = &h->mb[64*i8x8+256*p << pixel_shift];
670  uint8_t *nnz;
671  for(i4x4=0; i4x4<4; i4x4++){
672  const int index= i4x4 + 4*i8x8 + p*16;
673  if( decode_residual(h, gb, buf, index, scan8x8+16*i4x4,
674  h->dequant8_coeff[cqm][qscale], 16) < 0 )
675  return -1;
676  }
677  nnz= &h->non_zero_count_cache[ scan8[4*i8x8+p*16] ];
678  nnz[0] += nnz[1] + nnz[8] + nnz[9];
679  new_cbp |= !!nnz[0] << i8x8;
680  }else{
681  for(i4x4=0; i4x4<4; i4x4++){
682  const int index= i4x4 + 4*i8x8 + p*16;
683  if( decode_residual(h, gb, h->mb + (16*index << pixel_shift), index,
684  scan, h->dequant4_coeff[cqm][qscale], 16) < 0 ){
685  return -1;
686  }
687  new_cbp |= h->non_zero_count_cache[ scan8[index] ] << i8x8;
688  }
689  }
690  }else{
691  uint8_t * const nnz= &h->non_zero_count_cache[ scan8[4*i8x8+p*16] ];
692  nnz[0] = nnz[1] = nnz[8] = nnz[9] = 0;
693  }
694  }
695  return new_cbp;
696  }
697 }
698 
699 int ff_h264_decode_mb_cavlc(H264Context *h){
700  int mb_xy;
701  int partition_count;
702  unsigned int mb_type, cbp;
703  int dct8x8_allowed= h->pps.transform_8x8_mode;
704  int decode_chroma = h->sps.chroma_format_idc == 1 || h->sps.chroma_format_idc == 2;
705  const int pixel_shift = h->pixel_shift;
706  unsigned local_ref_count[2];
707 
708  mb_xy = h->mb_xy = h->mb_x + h->mb_y*h->mb_stride;
709 
710  tprintf(h->avctx, "pic:%d mb:%d/%d\n", h->frame_num, h->mb_x, h->mb_y);
711  cbp = 0; /* avoid warning. FIXME: find a solution without slowing
712  down the code */
713  if(h->slice_type_nos != AV_PICTURE_TYPE_I){
714  if(h->mb_skip_run==-1)
715  h->mb_skip_run= get_ue_golomb_long(&h->gb);
716 
717  if (h->mb_skip_run--) {
718  if(FRAME_MBAFF(h) && (h->mb_y&1) == 0){
719  if(h->mb_skip_run==0)
720  h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&h->gb);
721  }
722  decode_mb_skip(h);
723  return 0;
724  }
725  }
726  if (FRAME_MBAFF(h)) {
727  if( (h->mb_y&1) == 0 )
728  h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&h->gb);
729  }
730 
731  h->prev_mb_skipped= 0;
732 
733  mb_type= get_ue_golomb(&h->gb);
734  if(h->slice_type_nos == AV_PICTURE_TYPE_B){
735  if(mb_type < 23){
736  partition_count= b_mb_type_info[mb_type].partition_count;
737  mb_type= b_mb_type_info[mb_type].type;
738  }else{
739  mb_type -= 23;
740  goto decode_intra_mb;
741  }
742  }else if(h->slice_type_nos == AV_PICTURE_TYPE_P){
743  if(mb_type < 5){
744  partition_count= p_mb_type_info[mb_type].partition_count;
745  mb_type= p_mb_type_info[mb_type].type;
746  }else{
747  mb_type -= 5;
748  goto decode_intra_mb;
749  }
750  }else{
751  av_assert2(h->slice_type_nos == AV_PICTURE_TYPE_I);
752  if(h->slice_type == AV_PICTURE_TYPE_SI && mb_type)
753  mb_type--;
754 decode_intra_mb:
755  if(mb_type > 25){
756  av_log(h->avctx, AV_LOG_ERROR, "mb_type %d in %c slice too large at %d %d\n", mb_type, av_get_picture_type_char(h->slice_type), h->mb_x, h->mb_y);
757  return -1;
758  }
759  partition_count=0;
760  cbp= i_mb_type_info[mb_type].cbp;
761  h->intra16x16_pred_mode= i_mb_type_info[mb_type].pred_mode;
762  mb_type= i_mb_type_info[mb_type].type;
763  }
764 
765  if(MB_FIELD(h))
766  mb_type |= MB_TYPE_INTERLACED;
767 
768  h->slice_table[ mb_xy ]= h->slice_num;
769 
770  if(IS_INTRA_PCM(mb_type)){
771  const int mb_size = ff_h264_mb_sizes[h->sps.chroma_format_idc] *
772  h->sps.bit_depth_luma;
773 
774  // We assume these blocks are very rare so we do not optimize it.
775  h->intra_pcm_ptr = align_get_bits(&h->gb);
776  if (get_bits_left(&h->gb) < mb_size) {
777  av_log(h->avctx, AV_LOG_ERROR, "Not enough data for an intra PCM block.\n");
778  return AVERROR_INVALIDDATA;
779  }
780  skip_bits_long(&h->gb, mb_size);
781 
782  // In deblocking, the quantizer is 0
783  h->cur_pic.qscale_table[mb_xy] = 0;
784  // All coeffs are present
785  memset(h->non_zero_count[mb_xy], 16, 48);
786 
787  h->cur_pic.mb_type[mb_xy] = mb_type;
788  return 0;
789  }
790 
791  local_ref_count[0] = h->ref_count[0] << MB_MBAFF(h);
792  local_ref_count[1] = h->ref_count[1] << MB_MBAFF(h);
793 
794  fill_decode_neighbors(h, mb_type);
795  fill_decode_caches(h, mb_type);
796 
797  //mb_pred
798  if(IS_INTRA(mb_type)){
799  int pred_mode;
800 // init_top_left_availability(h);
801  if(IS_INTRA4x4(mb_type)){
802  int i;
803  int di = 1;
804  if(dct8x8_allowed && get_bits1(&h->gb)){
805  mb_type |= MB_TYPE_8x8DCT;
806  di = 4;
807  }
808 
809 // fill_intra4x4_pred_table(h);
810  for(i=0; i<16; i+=di){
811  int mode= pred_intra_mode(h, i);
812 
813  if(!get_bits1(&h->gb)){
814  const int rem_mode= get_bits(&h->gb, 3);
815  mode = rem_mode + (rem_mode >= mode);
816  }
817 
818  if(di==4)
819  fill_rectangle( &h->intra4x4_pred_mode_cache[ scan8[i] ], 2, 2, 8, mode, 1 );
820  else
821  h->intra4x4_pred_mode_cache[ scan8[i] ] = mode;
822  }
823  write_back_intra_pred_mode(h);
824  if( ff_h264_check_intra4x4_pred_mode(h) < 0)
825  return -1;
826  }else{
827  h->intra16x16_pred_mode= ff_h264_check_intra_pred_mode(h, h->intra16x16_pred_mode, 0);
828  if(h->intra16x16_pred_mode < 0)
829  return -1;
830  }
831  if(decode_chroma){
832  pred_mode= ff_h264_check_intra_pred_mode(h, get_ue_golomb_31(&h->gb), 1);
833  if(pred_mode < 0)
834  return -1;
835  h->chroma_pred_mode= pred_mode;
836  } else {
837  h->chroma_pred_mode = DC_128_PRED8x8;
838  }
839  }else if(partition_count==4){
840  int i, j, sub_partition_count[4], list, ref[2][4];
841 
842  if(h->slice_type_nos == AV_PICTURE_TYPE_B){
843  for(i=0; i<4; i++){
844  h->sub_mb_type[i]= get_ue_golomb_31(&h->gb);
845  if(h->sub_mb_type[i] >=13){
846  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);
847  return -1;
848  }
849  sub_partition_count[i]= b_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;
850  h->sub_mb_type[i]= b_sub_mb_type_info[ h->sub_mb_type[i] ].type;
851  }
852  if( IS_DIRECT(h->sub_mb_type[0]|h->sub_mb_type[1]|h->sub_mb_type[2]|h->sub_mb_type[3])) {
853  ff_h264_pred_direct_motion(h, &mb_type);
854  h->ref_cache[0][scan8[4]] =
855  h->ref_cache[1][scan8[4]] =
856  h->ref_cache[0][scan8[12]] =
857  h->ref_cache[1][scan8[12]] = PART_NOT_AVAILABLE;
858  }
859  }else{
860  av_assert2(h->slice_type_nos == AV_PICTURE_TYPE_P); //FIXME SP correct ?
861  for(i=0; i<4; i++){
862  h->sub_mb_type[i]= get_ue_golomb_31(&h->gb);
863  if(h->sub_mb_type[i] >=4){
864  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);
865  return -1;
866  }
867  sub_partition_count[i]= p_sub_mb_type_info[ h->sub_mb_type[i] ].partition_count;
868  h->sub_mb_type[i]= p_sub_mb_type_info[ h->sub_mb_type[i] ].type;
869  }
870  }
871 
872  for(list=0; list<h->list_count; list++){
873  int ref_count = IS_REF0(mb_type) ? 1 : local_ref_count[list];
874  for(i=0; i<4; i++){
875  if(IS_DIRECT(h->sub_mb_type[i])) continue;
876  if(IS_DIR(h->sub_mb_type[i], 0, list)){
877  unsigned int tmp;
878  if(ref_count == 1){
879  tmp= 0;
880  }else if(ref_count == 2){
881  tmp= get_bits1(&h->gb)^1;
882  }else{
883  tmp= get_ue_golomb_31(&h->gb);
884  if(tmp>=ref_count){
885  av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", tmp);
886  return -1;
887  }
888  }
889  ref[list][i]= tmp;
890  }else{
891  //FIXME
892  ref[list][i] = -1;
893  }
894  }
895  }
896 
897  if(dct8x8_allowed)
898  dct8x8_allowed = get_dct8x8_allowed(h);
899 
900  for(list=0; list<h->list_count; list++){
901  for(i=0; i<4; i++){
902  if(IS_DIRECT(h->sub_mb_type[i])) {
903  h->ref_cache[list][ scan8[4*i] ] = h->ref_cache[list][ scan8[4*i]+1 ];
904  continue;
905  }
906  h->ref_cache[list][ scan8[4*i] ]=h->ref_cache[list][ scan8[4*i]+1 ]=
907  h->ref_cache[list][ scan8[4*i]+8 ]=h->ref_cache[list][ scan8[4*i]+9 ]= ref[list][i];
908 
909  if(IS_DIR(h->sub_mb_type[i], 0, list)){
910  const int sub_mb_type= h->sub_mb_type[i];
911  const int block_width= (sub_mb_type & (MB_TYPE_16x16|MB_TYPE_16x8)) ? 2 : 1;
912  for(j=0; j<sub_partition_count[i]; j++){
913  int mx, my;
914  const int index= 4*i + block_width*j;
915  int16_t (* mv_cache)[2]= &h->mv_cache[list][ scan8[index] ];
916  pred_motion(h, index, block_width, list, h->ref_cache[list][ scan8[index] ], &mx, &my);
917  mx += get_se_golomb(&h->gb);
918  my += get_se_golomb(&h->gb);
919  tprintf(h->avctx, "final mv:%d %d\n", mx, my);
920 
921  if(IS_SUB_8X8(sub_mb_type)){
922  mv_cache[ 1 ][0]=
923  mv_cache[ 8 ][0]= mv_cache[ 9 ][0]= mx;
924  mv_cache[ 1 ][1]=
925  mv_cache[ 8 ][1]= mv_cache[ 9 ][1]= my;
926  }else if(IS_SUB_8X4(sub_mb_type)){
927  mv_cache[ 1 ][0]= mx;
928  mv_cache[ 1 ][1]= my;
929  }else if(IS_SUB_4X8(sub_mb_type)){
930  mv_cache[ 8 ][0]= mx;
931  mv_cache[ 8 ][1]= my;
932  }
933  mv_cache[ 0 ][0]= mx;
934  mv_cache[ 0 ][1]= my;
935  }
936  }else{
937  uint32_t *p= (uint32_t *)&h->mv_cache[list][ scan8[4*i] ][0];
938  p[0] = p[1]=
939  p[8] = p[9]= 0;
940  }
941  }
942  }
943  }else if(IS_DIRECT(mb_type)){
944  ff_h264_pred_direct_motion(h, &mb_type);
945  dct8x8_allowed &= h->sps.direct_8x8_inference_flag;
946  }else{
947  int list, mx, my, i;
948  //FIXME we should set ref_idx_l? to 0 if we use that later ...
949  if(IS_16X16(mb_type)){
950  for(list=0; list<h->list_count; list++){
951  unsigned int val;
952  if(IS_DIR(mb_type, 0, list)){
953  if(local_ref_count[list]==1){
954  val= 0;
955  } else if(local_ref_count[list]==2){
956  val= get_bits1(&h->gb)^1;
957  }else{
958  val= get_ue_golomb_31(&h->gb);
959  if (val >= local_ref_count[list]){
960  av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
961  return -1;
962  }
963  }
964  fill_rectangle(&h->ref_cache[list][ scan8[0] ], 4, 4, 8, val, 1);
965  }
966  }
967  for(list=0; list<h->list_count; list++){
968  if(IS_DIR(mb_type, 0, list)){
969  pred_motion(h, 0, 4, list, h->ref_cache[list][ scan8[0] ], &mx, &my);
970  mx += get_se_golomb(&h->gb);
971  my += get_se_golomb(&h->gb);
972  tprintf(h->avctx, "final mv:%d %d\n", mx, my);
973 
974  fill_rectangle(h->mv_cache[list][ scan8[0] ], 4, 4, 8, pack16to32(mx,my), 4);
975  }
976  }
977  }
978  else if(IS_16X8(mb_type)){
979  for(list=0; list<h->list_count; list++){
980  for(i=0; i<2; i++){
981  unsigned int val;
982  if(IS_DIR(mb_type, i, list)){
983  if(local_ref_count[list] == 1) {
984  val= 0;
985  } else if(local_ref_count[list] == 2) {
986  val= get_bits1(&h->gb)^1;
987  }else{
988  val= get_ue_golomb_31(&h->gb);
989  if (val >= local_ref_count[list]){
990  av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
991  return -1;
992  }
993  }
994  }else
995  val= LIST_NOT_USED&0xFF;
996  fill_rectangle(&h->ref_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 1);
997  }
998  }
999  for(list=0; list<h->list_count; list++){
1000  for(i=0; i<2; i++){
1001  unsigned int val;
1002  if(IS_DIR(mb_type, i, list)){
1003  pred_16x8_motion(h, 8*i, list, h->ref_cache[list][scan8[0] + 16*i], &mx, &my);
1004  mx += get_se_golomb(&h->gb);
1005  my += get_se_golomb(&h->gb);
1006  tprintf(h->avctx, "final mv:%d %d\n", mx, my);
1007 
1008  val= pack16to32(mx,my);
1009  }else
1010  val=0;
1011  fill_rectangle(h->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);
1012  }
1013  }
1014  }else{
1015  av_assert2(IS_8X16(mb_type));
1016  for(list=0; list<h->list_count; list++){
1017  for(i=0; i<2; i++){
1018  unsigned int val;
1019  if(IS_DIR(mb_type, i, list)){ //FIXME optimize
1020  if(local_ref_count[list]==1){
1021  val= 0;
1022  } else if(local_ref_count[list]==2){
1023  val= get_bits1(&h->gb)^1;
1024  }else{
1025  val= get_ue_golomb_31(&h->gb);
1026  if (val >= local_ref_count[list]){
1027  av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);
1028  return -1;
1029  }
1030  }
1031  }else
1032  val= LIST_NOT_USED&0xFF;
1033  fill_rectangle(&h->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);
1034  }
1035  }
1036  for(list=0; list<h->list_count; list++){
1037  for(i=0; i<2; i++){
1038  unsigned int val;
1039  if(IS_DIR(mb_type, i, list)){
1040  pred_8x16_motion(h, i*4, list, h->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);
1041  mx += get_se_golomb(&h->gb);
1042  my += get_se_golomb(&h->gb);
1043  tprintf(h->avctx, "final mv:%d %d\n", mx, my);
1044 
1045  val= pack16to32(mx,my);
1046  }else
1047  val=0;
1048  fill_rectangle(h->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);
1049  }
1050  }
1051  }
1052  }
1053 
1054  if(IS_INTER(mb_type))
1055  write_back_motion(h, mb_type);
1056 
1057  if(!IS_INTRA16x16(mb_type)){
1058  cbp= get_ue_golomb(&h->gb);
1059 
1060  if(decode_chroma){
1061  if(cbp > 47){
1062  av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, h->mb_x, h->mb_y);
1063  return -1;
1064  }
1065  if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp[cbp];
1066  else cbp= golomb_to_inter_cbp [cbp];
1067  }else{
1068  if(cbp > 15){
1069  av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, h->mb_x, h->mb_y);
1070  return -1;
1071  }
1072  if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];
1073  else cbp= golomb_to_inter_cbp_gray[cbp];
1074  }
1075  } else {
1076  if (!decode_chroma && cbp>15) {
1077  av_log(h->avctx, AV_LOG_ERROR, "gray chroma\n");
1078  return AVERROR_INVALIDDATA;
1079  }
1080  }
1081 
1082  if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){
1083  mb_type |= MB_TYPE_8x8DCT*get_bits1(&h->gb);
1084  }
1085  h->cbp=
1086  h->cbp_table[mb_xy]= cbp;
1087  h->cur_pic.mb_type[mb_xy] = mb_type;
1088 
1089  if(cbp || IS_INTRA16x16(mb_type)){
1090  int i4x4, i8x8, chroma_idx;
1091  int dquant;
1092  int ret;
1093  GetBitContext *gb= IS_INTRA(mb_type) ? h->intra_gb_ptr : h->inter_gb_ptr;
1094  const uint8_t *scan, *scan8x8;
1095  const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);
1096 
1097  if(IS_INTERLACED(mb_type)){
1098  scan8x8= h->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;
1099  scan= h->qscale ? h->field_scan : h->field_scan_q0;
1100  }else{
1101  scan8x8= h->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;
1102  scan= h->qscale ? h->zigzag_scan : h->zigzag_scan_q0;
1103  }
1104 
1105  dquant= get_se_golomb(&h->gb);
1106 
1107  h->qscale += dquant;
1108 
1109  if(((unsigned)h->qscale) > max_qp){
1110  if(h->qscale<0) h->qscale+= max_qp+1;
1111  else h->qscale-= max_qp+1;
1112  if(((unsigned)h->qscale) > max_qp){
1113  av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, h->mb_x, h->mb_y);
1114  return -1;
1115  }
1116  }
1117 
1118  h->chroma_qp[0]= get_chroma_qp(h, 0, h->qscale);
1119  h->chroma_qp[1]= get_chroma_qp(h, 1, h->qscale);
1120 
1121  if( (ret = decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 0)) < 0 ){
1122  return -1;
1123  }
1124  h->cbp_table[mb_xy] |= ret << 12;
1125  if (CHROMA444(h)) {
1126  if( decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 1) < 0 ){
1127  return -1;
1128  }
1129  if( decode_luma_residual(h, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 2) < 0 ){
1130  return -1;
1131  }
1132  } else {
1133  const int num_c8x8 = h->sps.chroma_format_idc;
1134 
1135  if(cbp&0x30){
1136  for(chroma_idx=0; chroma_idx<2; chroma_idx++)
1137  if (decode_residual(h, gb, h->mb + ((256 + 16*16*chroma_idx) << pixel_shift),
1138  CHROMA_DC_BLOCK_INDEX+chroma_idx,
1139  CHROMA422(h) ? chroma422_dc_scan : chroma_dc_scan,
1140  NULL, 4*num_c8x8) < 0) {
1141  return -1;
1142  }
1143  }
1144 
1145  if(cbp&0x20){
1146  for(chroma_idx=0; chroma_idx<2; chroma_idx++){
1147  const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][h->chroma_qp[chroma_idx]];
1148  int16_t *mb = h->mb + (16*(16 + 16*chroma_idx) << pixel_shift);
1149  for (i8x8 = 0; i8x8<num_c8x8; i8x8++) {
1150  for (i4x4 = 0; i4x4 < 4; i4x4++) {
1151  const int index = 16 + 16*chroma_idx + 8*i8x8 + i4x4;
1152  if (decode_residual(h, gb, mb, index, scan + 1, qmul, 15) < 0)
1153  return -1;
1154  mb += 16 << pixel_shift;
1155  }
1156  }
1157  }
1158  }else{
1159  fill_rectangle(&h->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);
1160  fill_rectangle(&h->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);
1161  }
1162  }
1163  }else{
1164  fill_rectangle(&h->non_zero_count_cache[scan8[ 0]], 4, 4, 8, 0, 1);
1165  fill_rectangle(&h->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);
1166  fill_rectangle(&h->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);
1167  }
1168  h->cur_pic.qscale_table[mb_xy] = h->qscale;
1169  write_back_non_zero_count(h);
1170 
1171  return 0;
1172 }
Generated on Sun Mar 8 2015 02:34:52 for FFmpeg by   doxygen 1.8.2