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h264_parse.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "bytestream.h"
20 #include "get_bits.h"
21 #include "golomb.h"
22 #include "h264.h"
23 #include "h264dec.h"
24 #include "h264_parse.h"
25 #include "h264_ps.h"
26 
28  const int *ref_count, int slice_type_nos,
29  H264PredWeightTable *pwt, void *logctx)
30 {
31  int list, i, j;
32  int luma_def, chroma_def;
33 
34  pwt->use_weight = 0;
35  pwt->use_weight_chroma = 0;
37  if (sps->chroma_format_idc)
39 
40  if (pwt->luma_log2_weight_denom > 7U) {
41  av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
42  pwt->luma_log2_weight_denom = 0;
43  }
44  if (pwt->chroma_log2_weight_denom > 7U) {
45  av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
46  pwt->chroma_log2_weight_denom = 0;
47  }
48 
49  luma_def = 1 << pwt->luma_log2_weight_denom;
50  chroma_def = 1 << pwt->chroma_log2_weight_denom;
51 
52  for (list = 0; list < 2; list++) {
53  pwt->luma_weight_flag[list] = 0;
54  pwt->chroma_weight_flag[list] = 0;
55  for (i = 0; i < ref_count[list]; i++) {
56  int luma_weight_flag, chroma_weight_flag;
57 
58  luma_weight_flag = get_bits1(gb);
59  if (luma_weight_flag) {
60  pwt->luma_weight[i][list][0] = get_se_golomb(gb);
61  pwt->luma_weight[i][list][1] = get_se_golomb(gb);
62  if (pwt->luma_weight[i][list][0] != luma_def ||
63  pwt->luma_weight[i][list][1] != 0) {
64  pwt->use_weight = 1;
65  pwt->luma_weight_flag[list] = 1;
66  }
67  } else {
68  pwt->luma_weight[i][list][0] = luma_def;
69  pwt->luma_weight[i][list][1] = 0;
70  }
71 
72  if (sps->chroma_format_idc) {
73  chroma_weight_flag = get_bits1(gb);
74  if (chroma_weight_flag) {
75  int j;
76  for (j = 0; j < 2; j++) {
77  pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
78  pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
79  if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
80  pwt->chroma_weight[i][list][j][1] != 0) {
81  pwt->use_weight_chroma = 1;
82  pwt->chroma_weight_flag[list] = 1;
83  }
84  }
85  } else {
86  int j;
87  for (j = 0; j < 2; j++) {
88  pwt->chroma_weight[i][list][j][0] = chroma_def;
89  pwt->chroma_weight[i][list][j][1] = 0;
90  }
91  }
92  }
93 
94  // for MBAFF
95  pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
96  pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
97  for (j = 0; j < 2; j++) {
98  pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
99  pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
100  }
101  }
102  if (slice_type_nos != AV_PICTURE_TYPE_B)
103  break;
104  }
105  pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
106  return 0;
107 }
108 
109 /**
110  * Check if the top & left blocks are available if needed and
111  * change the dc mode so it only uses the available blocks.
112  */
113 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
114  int top_samples_available, int left_samples_available)
115 {
116  static const int8_t top[12] = {
117  -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
118  };
119  static const int8_t left[12] = {
120  0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
121  };
122  int i;
123 
124  if (!(top_samples_available & 0x8000)) {
125  for (i = 0; i < 4; i++) {
126  int status = top[pred_mode_cache[scan8[0] + i]];
127  if (status < 0) {
128  av_log(logctx, AV_LOG_ERROR,
129  "top block unavailable for requested intra mode %d\n",
130  status);
131  return AVERROR_INVALIDDATA;
132  } else if (status) {
133  pred_mode_cache[scan8[0] + i] = status;
134  }
135  }
136  }
137 
138  if ((left_samples_available & 0x8888) != 0x8888) {
139  static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
140  for (i = 0; i < 4; i++)
141  if (!(left_samples_available & mask[i])) {
142  int status = left[pred_mode_cache[scan8[0] + 8 * i]];
143  if (status < 0) {
144  av_log(logctx, AV_LOG_ERROR,
145  "left block unavailable for requested intra4x4 mode %d\n",
146  status);
147  return AVERROR_INVALIDDATA;
148  } else if (status) {
149  pred_mode_cache[scan8[0] + 8 * i] = status;
150  }
151  }
152  }
153 
154  return 0;
155 }
156 
157 /**
158  * Check if the top & left blocks are available if needed and
159  * change the dc mode so it only uses the available blocks.
160  */
161 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
162  int left_samples_available,
163  int mode, int is_chroma)
164 {
165  static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
166  static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
167 
168  if (mode > 3U) {
169  av_log(logctx, AV_LOG_ERROR,
170  "out of range intra chroma pred mode\n");
171  return AVERROR_INVALIDDATA;
172  }
173 
174  if (!(top_samples_available & 0x8000)) {
175  mode = top[mode];
176  if (mode < 0) {
177  av_log(logctx, AV_LOG_ERROR,
178  "top block unavailable for requested intra mode\n");
179  return AVERROR_INVALIDDATA;
180  }
181  }
182 
183  if ((left_samples_available & 0x8080) != 0x8080) {
184  mode = left[mode];
185  if (mode < 0) {
186  av_log(logctx, AV_LOG_ERROR,
187  "left block unavailable for requested intra mode\n");
188  return AVERROR_INVALIDDATA;
189  }
190  if (is_chroma && (left_samples_available & 0x8080)) {
191  // mad cow disease mode, aka MBAFF + constrained_intra_pred
192  mode = ALZHEIMER_DC_L0T_PRED8x8 +
193  (!(left_samples_available & 0x8000)) +
194  2 * (mode == DC_128_PRED8x8);
195  }
196  }
197 
198  return mode;
199 }
200 
201 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
202  GetBitContext *gb, const PPS *pps,
203  int slice_type_nos, int picture_structure, void *logctx)
204 {
205  int list_count;
206  int num_ref_idx_active_override_flag;
207 
208  // set defaults, might be overridden a few lines later
209  ref_count[0] = pps->ref_count[0];
210  ref_count[1] = pps->ref_count[1];
211 
212  if (slice_type_nos != AV_PICTURE_TYPE_I) {
213  unsigned max[2];
214  max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
215 
216  num_ref_idx_active_override_flag = get_bits1(gb);
217 
218  if (num_ref_idx_active_override_flag) {
219  ref_count[0] = get_ue_golomb(gb) + 1;
220  if (slice_type_nos == AV_PICTURE_TYPE_B) {
221  ref_count[1] = get_ue_golomb(gb) + 1;
222  } else
223  // full range is spec-ok in this case, even for frames
224  ref_count[1] = 1;
225  }
226 
227  if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) {
228  av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
229  ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
230  ref_count[0] = ref_count[1] = 0;
231  *plist_count = 0;
232  goto fail;
233  }
234 
235  if (slice_type_nos == AV_PICTURE_TYPE_B)
236  list_count = 2;
237  else
238  list_count = 1;
239  } else {
240  list_count = 0;
241  ref_count[0] = ref_count[1] = 0;
242  }
243 
244  *plist_count = list_count;
245 
246  return 0;
247 fail:
248  *plist_count = 0;
249  ref_count[0] = 0;
250  ref_count[1] = 0;
251  return AVERROR_INVALIDDATA;
252 }
253 
254 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
255  const SPS *sps, H264POCContext *pc,
256  int picture_structure, int nal_ref_idc)
257 {
258  const int max_frame_num = 1 << sps->log2_max_frame_num;
259  int field_poc[2];
260 
262  if (pc->frame_num < pc->prev_frame_num)
263  pc->frame_num_offset += max_frame_num;
264 
265  if (sps->poc_type == 0) {
266  const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
267 
268  if (pc->poc_lsb < pc->prev_poc_lsb &&
269  pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
270  pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
271  else if (pc->poc_lsb > pc->prev_poc_lsb &&
272  pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
273  pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
274  else
275  pc->poc_msb = pc->prev_poc_msb;
276  field_poc[0] =
277  field_poc[1] = pc->poc_msb + pc->poc_lsb;
278  if (picture_structure == PICT_FRAME)
279  field_poc[1] += pc->delta_poc_bottom;
280  } else if (sps->poc_type == 1) {
281  int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
282  int i;
283 
284  if (sps->poc_cycle_length != 0)
285  abs_frame_num = pc->frame_num_offset + pc->frame_num;
286  else
287  abs_frame_num = 0;
288 
289  if (nal_ref_idc == 0 && abs_frame_num > 0)
290  abs_frame_num--;
291 
292  expected_delta_per_poc_cycle = 0;
293  for (i = 0; i < sps->poc_cycle_length; i++)
294  // FIXME integrate during sps parse
295  expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
296 
297  if (abs_frame_num > 0) {
298  int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
299  int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
300 
301  expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
302  for (i = 0; i <= frame_num_in_poc_cycle; i++)
303  expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
304  } else
305  expectedpoc = 0;
306 
307  if (nal_ref_idc == 0)
308  expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
309 
310  field_poc[0] = expectedpoc + pc->delta_poc[0];
311  field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
312 
313  if (picture_structure == PICT_FRAME)
314  field_poc[1] += pc->delta_poc[1];
315  } else {
316  int poc = 2 * (pc->frame_num_offset + pc->frame_num);
317 
318  if (!nal_ref_idc)
319  poc--;
320 
321  field_poc[0] = poc;
322  field_poc[1] = poc;
323  }
324 
325  if (picture_structure != PICT_BOTTOM_FIELD)
326  pic_field_poc[0] = field_poc[0];
327  if (picture_structure != PICT_TOP_FIELD)
328  pic_field_poc[1] = field_poc[1];
329  *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
330 
331  return 0;
332 }
333 
334 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
335  int is_avc, void *logctx)
336 {
337  H2645Packet pkt = { 0 };
338  int i, ret = 0;
339 
340  ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1);
341  if (ret < 0) {
342  ret = 0;
343  goto fail;
344  }
345 
346  for (i = 0; i < pkt.nb_nals; i++) {
347  H2645NAL *nal = &pkt.nals[i];
348  switch (nal->type) {
349  case H264_NAL_SPS:
350  ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 0);
351  if (ret < 0)
352  goto fail;
353  break;
354  case H264_NAL_PPS:
355  ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
356  nal->size_bits);
357  if (ret < 0)
358  goto fail;
359  break;
360  default:
361  av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
362  nal->type);
363  break;
364  }
365  }
366 
367 fail:
369  return ret;
370 }
371 
372 /* There are (invalid) samples in the wild with mp4-style extradata, where the
373  * parameter sets are stored unescaped (i.e. as RBSP).
374  * This function catches the parameter set decoding failure and tries again
375  * after escaping it */
376 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
377  int err_recognition, void *logctx)
378 {
379  int ret;
380 
381  ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
382  if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
383  GetByteContext gbc;
384  PutByteContext pbc;
385  uint8_t *escaped_buf;
386  int escaped_buf_size;
387 
388  av_log(logctx, AV_LOG_WARNING,
389  "SPS decoding failure, trying again after escaping the NAL\n");
390 
391  if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
392  return AVERROR(ERANGE);
393  escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
394  escaped_buf = av_mallocz(escaped_buf_size);
395  if (!escaped_buf)
396  return AVERROR(ENOMEM);
397 
398  bytestream2_init(&gbc, buf, buf_size);
399  bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
400 
401  while (bytestream2_get_bytes_left(&gbc)) {
402  if (bytestream2_get_bytes_left(&gbc) >= 3 &&
403  bytestream2_peek_be24(&gbc) <= 3) {
404  bytestream2_put_be24(&pbc, 3);
405  bytestream2_skip(&gbc, 2);
406  } else
407  bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
408  }
409 
410  escaped_buf_size = bytestream2_tell_p(&pbc);
411  AV_WB16(escaped_buf, escaped_buf_size - 2);
412 
413  ret = decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
414  av_freep(&escaped_buf);
415  if (ret < 0)
416  return ret;
417  }
418 
419  return 0;
420 }
421 
423  int *is_avc, int *nal_length_size,
424  int err_recognition, void *logctx)
425 {
426  int ret;
427 
428  if (!data || size <= 0)
429  return -1;
430 
431  if (data[0] == 1) {
432  int i, cnt, nalsize;
433  const uint8_t *p = data;
434 
435  *is_avc = 1;
436 
437  if (size < 7) {
438  av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
439  return AVERROR_INVALIDDATA;
440  }
441 
442  // Decode sps from avcC
443  cnt = *(p + 5) & 0x1f; // Number of sps
444  p += 6;
445  for (i = 0; i < cnt; i++) {
446  nalsize = AV_RB16(p) + 2;
447  if (nalsize > size - (p - data))
448  return AVERROR_INVALIDDATA;
449  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
450  if (ret < 0) {
451  av_log(logctx, AV_LOG_ERROR,
452  "Decoding sps %d from avcC failed\n", i);
453  return ret;
454  }
455  p += nalsize;
456  }
457  // Decode pps from avcC
458  cnt = *(p++); // Number of pps
459  for (i = 0; i < cnt; i++) {
460  nalsize = AV_RB16(p) + 2;
461  if (nalsize > size - (p - data))
462  return AVERROR_INVALIDDATA;
463  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
464  if (ret < 0) {
465  av_log(logctx, AV_LOG_ERROR,
466  "Decoding pps %d from avcC failed\n", i);
467  return ret;
468  }
469  p += nalsize;
470  }
471  // Store right nal length size that will be used to parse all other nals
472  *nal_length_size = (data[4] & 0x03) + 1;
473  } else {
474  *is_avc = 0;
475  ret = decode_extradata_ps(data, size, ps, 0, logctx);
476  if (ret < 0)
477  return ret;
478  }
479  return size;
480 }
481 
482 /**
483  * Compute profile from profile_idc and constraint_set?_flags.
484  *
485  * @param sps SPS
486  *
487  * @return profile as defined by FF_PROFILE_H264_*
488  */
489 int ff_h264_get_profile(const SPS *sps)
490 {
491  int profile = sps->profile_idc;
492 
493  switch (sps->profile_idc) {
495  // constraint_set1_flag set to 1
496  profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
497  break;
501  // constraint_set3_flag set to 1
502  profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
503  break;
504  }
505 
506  return profile;
507 }
int chroma_format_idc
Definition: h264_ps.h:47
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int bit_length)
Decode PPS.
Definition: h264_ps.c:713
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, void *logctx, int is_nalff, int nal_length_size, enum AVCodecID codec_id, int small_padding)
Split an input packet into NAL units.
Definition: h2645_parse.c:250
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define DC_128_PRED8x8
Definition: h264pred.h:76
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int luma_weight_flag[2]
7.4.3.2 luma_weight_lX_flag
Definition: h264_parse.h:35
static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps, int err_recognition, void *logctx)
Definition: h264_parse.c:376
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:39
Sequence parameter set.
Definition: h264_ps.h:43
#define FF_PROFILE_H264_INTRA
Definition: avcodec.h:3218
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:113
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:143
int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, const SPS *sps, H264POCContext *pc, int picture_structure, int nal_ref_idc)
Definition: h264_parse.c:254
Picture parameter set.
Definition: h264_ps.h:107
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
int profile_idc
Definition: h264_ps.h:45
int size_bits
Size, in bits, of just the data, excluding the stop bit and any trailing padding. ...
Definition: h2645_parse.h:42
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE
Definition: avcodec.h:3232
#define FF_PROFILE_H264_BASELINE
Definition: avcodec.h:3220
uint8_t
int offset_for_non_ref_pic
Definition: h264_ps.h:53
mode
Definition: f_perms.c:27
int frame_num_offset
for POC type 2
Definition: h264_parse.h:51
int chroma_weight_flag[2]
7.4.3.2 chroma_weight_lX_flag
Definition: h264_parse.h:36
#define TOP_DC_PRED8x8
Definition: h264pred.h:75
void ff_h2645_packet_uninit(H2645Packet *pkt)
Free all the allocated memory in the packet.
Definition: h2645_parse.c:371
int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps, int *is_avc, int *nal_length_size, int err_recognition, void *logctx)
Definition: h264_parse.c:422
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
bitstream reader API header.
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, int top_samples_available, int left_samples_available)
Check if the top & left blocks are available if needed and change the dc mode so it only uses the ava...
Definition: h264_parse.c:113
static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps, int is_avc, void *logctx)
Definition: h264_parse.c:334
ptrdiff_t size
Definition: opengl_enc.c:101
int luma_weight[48][2][2]
Definition: h264_parse.h:38
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
#define av_log(a,...)
H.264 common definitions.
#define U(x)
Definition: vp56_arith.h:37
H.264 parameter set handling.
int chroma_log2_weight_denom
Definition: h264_parse.h:34
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int get_ue_golomb(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to 8190.
Definition: golomb.h:53
int poc_type
pic_order_cnt_type
Definition: h264_ps.h:50
static const uint16_t mask[17]
Definition: lzw.c:38
int ff_h264_get_profile(const SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264_parse.c:489
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define ALZHEIMER_DC_L0T_PRED8x8
Definition: h264pred.h:79
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define FF_PROFILE_H264_HIGH_422
Definition: avcodec.h:3228
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:193
#define fail()
Definition: checkasm.h:83
int offset_for_top_to_bottom_field
Definition: h264_ps.h:54
int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], GetBitContext *gb, const PPS *pps, int slice_type_nos, int picture_structure, void *logctx)
Definition: h264_parse.c:201
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, void *logctx)
Definition: h264_parse.c:27
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:49
#define FFMIN(a, b)
Definition: common.h:96
int poc_cycle_length
num_ref_frames_in_pic_order_cnt_cycle
Definition: h264_ps.h:55
H.264 / AVC / MPEG-4 part10 codec.
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2975
#define LEFT_DC_PRED8x8
Definition: h264pred.h:74
int type
NAL unit type.
Definition: h2645_parse.h:52
short offset_for_ref_frame[256]
Definition: h264_ps.h:82
int delta_poc_bottom
Definition: h264_parse.h:46
void * buf
Definition: avisynth_c.h:690
static const uint8_t scan8[16 *3+3]
Definition: h264dec.h:656
int constraint_set_flags
constraint_set[0-3]_flag
Definition: h264_ps.h:99
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:53
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:51
mfxU16 profile
Definition: qsvenc.c:42
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
if(ret< 0)
Definition: vf_mcdeint.c:282
int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, int left_samples_available, int mode, int is_chroma)
Check if the top & left blocks are available if needed and change the dc mode so it only uses the ava...
Definition: h264_parse.c:161
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:49
Bi-dir predicted.
Definition: avutil.h:270
GetBitContext gb
Definition: h2645_parse.h:47
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:734
int delta_poc[2]
Definition: h264_parse.h:47
#define PICT_FRAME
Definition: mpegutils.h:39
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:324
H2645NAL * nals
Definition: h2645_parse.h:70
#define av_freep(p)
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:52
#define FF_PROFILE_H264_CONSTRAINED
Definition: avcodec.h:3217
H.264 decoder/parser shared code.
#define FF_PROFILE_H264_HIGH_10
Definition: avcodec.h:3225
exp golomb vlc stuff