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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,
30  int picture_structure, void *logctx)
31 {
32  int list, i, j;
33  int luma_def, chroma_def;
34 
35  pwt->use_weight = 0;
36  pwt->use_weight_chroma = 0;
37 
39  if (pwt->luma_log2_weight_denom > 7U) {
40  av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
41  pwt->luma_log2_weight_denom = 0;
42  }
43  luma_def = 1 << pwt->luma_log2_weight_denom;
44 
45  if (sps->chroma_format_idc) {
47  if (pwt->chroma_log2_weight_denom > 7U) {
48  av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
49  pwt->chroma_log2_weight_denom = 0;
50  }
51  chroma_def = 1 << pwt->chroma_log2_weight_denom;
52  }
53 
54  for (list = 0; list < 2; list++) {
55  pwt->luma_weight_flag[list] = 0;
56  pwt->chroma_weight_flag[list] = 0;
57  for (i = 0; i < ref_count[list]; i++) {
58  int luma_weight_flag, chroma_weight_flag;
59 
60  luma_weight_flag = get_bits1(gb);
61  if (luma_weight_flag) {
62  pwt->luma_weight[i][list][0] = get_se_golomb(gb);
63  pwt->luma_weight[i][list][1] = get_se_golomb(gb);
64  if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] ||
65  (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1])
66  goto out_range_weight;
67  if (pwt->luma_weight[i][list][0] != luma_def ||
68  pwt->luma_weight[i][list][1] != 0) {
69  pwt->use_weight = 1;
70  pwt->luma_weight_flag[list] = 1;
71  }
72  } else {
73  pwt->luma_weight[i][list][0] = luma_def;
74  pwt->luma_weight[i][list][1] = 0;
75  }
76 
77  if (sps->chroma_format_idc) {
78  chroma_weight_flag = get_bits1(gb);
79  if (chroma_weight_flag) {
80  int j;
81  for (j = 0; j < 2; j++) {
82  pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
83  pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
84  if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] ||
85  (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) {
86  pwt->chroma_weight[i][list][j][0] = chroma_def;
87  pwt->chroma_weight[i][list][j][1] = 0;
88  goto out_range_weight;
89  }
90  if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
91  pwt->chroma_weight[i][list][j][1] != 0) {
92  pwt->use_weight_chroma = 1;
93  pwt->chroma_weight_flag[list] = 1;
94  }
95  }
96  } else {
97  int j;
98  for (j = 0; j < 2; j++) {
99  pwt->chroma_weight[i][list][j][0] = chroma_def;
100  pwt->chroma_weight[i][list][j][1] = 0;
101  }
102  }
103  }
104 
105  // for MBAFF
106  if (picture_structure == PICT_FRAME) {
107  pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
108  pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
109  if (sps->chroma_format_idc) {
110  for (j = 0; j < 2; j++) {
111  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];
112  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];
113  }
114  }
115  }
116  }
117  if (slice_type_nos != AV_PICTURE_TYPE_B)
118  break;
119  }
120  pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
121  return 0;
122 out_range_weight:
123  avpriv_request_sample(logctx, "Out of range weight");
124  return AVERROR_INVALIDDATA;
125 }
126 
127 /**
128  * Check if the top & left blocks are available if needed and
129  * change the dc mode so it only uses the available blocks.
130  */
131 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
132  int top_samples_available, int left_samples_available)
133 {
134  static const int8_t top[12] = {
135  -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
136  };
137  static const int8_t left[12] = {
138  0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
139  };
140  int i;
141 
142  if (!(top_samples_available & 0x8000)) {
143  for (i = 0; i < 4; i++) {
144  int status = top[pred_mode_cache[scan8[0] + i]];
145  if (status < 0) {
146  av_log(logctx, AV_LOG_ERROR,
147  "top block unavailable for requested intra mode %d\n",
148  status);
149  return AVERROR_INVALIDDATA;
150  } else if (status) {
151  pred_mode_cache[scan8[0] + i] = status;
152  }
153  }
154  }
155 
156  if ((left_samples_available & 0x8888) != 0x8888) {
157  static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
158  for (i = 0; i < 4; i++)
159  if (!(left_samples_available & mask[i])) {
160  int status = left[pred_mode_cache[scan8[0] + 8 * i]];
161  if (status < 0) {
162  av_log(logctx, AV_LOG_ERROR,
163  "left block unavailable for requested intra4x4 mode %d\n",
164  status);
165  return AVERROR_INVALIDDATA;
166  } else if (status) {
167  pred_mode_cache[scan8[0] + 8 * i] = status;
168  }
169  }
170  }
171 
172  return 0;
173 }
174 
175 /**
176  * Check if the top & left blocks are available if needed and
177  * change the dc mode so it only uses the available blocks.
178  */
179 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
180  int left_samples_available,
181  int mode, int is_chroma)
182 {
183  static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
184  static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
185 
186  if (mode > 3U) {
187  av_log(logctx, AV_LOG_ERROR,
188  "out of range intra chroma pred mode\n");
189  return AVERROR_INVALIDDATA;
190  }
191 
192  if (!(top_samples_available & 0x8000)) {
193  mode = top[mode];
194  if (mode < 0) {
195  av_log(logctx, AV_LOG_ERROR,
196  "top block unavailable for requested intra mode\n");
197  return AVERROR_INVALIDDATA;
198  }
199  }
200 
201  if ((left_samples_available & 0x8080) != 0x8080) {
202  mode = left[mode];
203  if (mode < 0) {
204  av_log(logctx, AV_LOG_ERROR,
205  "left block unavailable for requested intra mode\n");
206  return AVERROR_INVALIDDATA;
207  }
208  if (is_chroma && (left_samples_available & 0x8080)) {
209  // mad cow disease mode, aka MBAFF + constrained_intra_pred
210  mode = ALZHEIMER_DC_L0T_PRED8x8 +
211  (!(left_samples_available & 0x8000)) +
212  2 * (mode == DC_128_PRED8x8);
213  }
214  }
215 
216  return mode;
217 }
218 
219 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
220  GetBitContext *gb, const PPS *pps,
221  int slice_type_nos, int picture_structure, void *logctx)
222 {
223  int list_count;
224  int num_ref_idx_active_override_flag;
225 
226  // set defaults, might be overridden a few lines later
227  ref_count[0] = pps->ref_count[0];
228  ref_count[1] = pps->ref_count[1];
229 
230  if (slice_type_nos != AV_PICTURE_TYPE_I) {
231  unsigned max[2];
232  max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
233 
234  num_ref_idx_active_override_flag = get_bits1(gb);
235 
236  if (num_ref_idx_active_override_flag) {
237  ref_count[0] = get_ue_golomb(gb) + 1;
238  if (slice_type_nos == AV_PICTURE_TYPE_B) {
239  ref_count[1] = get_ue_golomb(gb) + 1;
240  } else
241  // full range is spec-ok in this case, even for frames
242  ref_count[1] = 1;
243  }
244 
245  if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) {
246  av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
247  ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
248  ref_count[0] = ref_count[1] = 0;
249  *plist_count = 0;
250  goto fail;
251  }
252 
253  if (slice_type_nos == AV_PICTURE_TYPE_B)
254  list_count = 2;
255  else
256  list_count = 1;
257  } else {
258  list_count = 0;
259  ref_count[0] = ref_count[1] = 0;
260  }
261 
262  *plist_count = list_count;
263 
264  return 0;
265 fail:
266  *plist_count = 0;
267  ref_count[0] = 0;
268  ref_count[1] = 0;
269  return AVERROR_INVALIDDATA;
270 }
271 
272 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
273  const SPS *sps, H264POCContext *pc,
274  int picture_structure, int nal_ref_idc)
275 {
276  const int max_frame_num = 1 << sps->log2_max_frame_num;
277  int64_t field_poc[2];
278 
280  if (pc->frame_num < pc->prev_frame_num)
281  pc->frame_num_offset += max_frame_num;
282 
283  if (sps->poc_type == 0) {
284  const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
285 
286  if (pc->poc_lsb < pc->prev_poc_lsb &&
287  pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
288  pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
289  else if (pc->poc_lsb > pc->prev_poc_lsb &&
290  pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
291  pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
292  else
293  pc->poc_msb = pc->prev_poc_msb;
294  field_poc[0] =
295  field_poc[1] = pc->poc_msb + pc->poc_lsb;
296  if (picture_structure == PICT_FRAME)
297  field_poc[1] += pc->delta_poc_bottom;
298  } else if (sps->poc_type == 1) {
299  int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
300  int i;
301 
302  if (sps->poc_cycle_length != 0)
303  abs_frame_num = pc->frame_num_offset + pc->frame_num;
304  else
305  abs_frame_num = 0;
306 
307  if (nal_ref_idc == 0 && abs_frame_num > 0)
308  abs_frame_num--;
309 
310  expected_delta_per_poc_cycle = 0;
311  for (i = 0; i < sps->poc_cycle_length; i++)
312  // FIXME integrate during sps parse
313  expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
314 
315  if (abs_frame_num > 0) {
316  int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
317  int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
318 
319  expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
320  for (i = 0; i <= frame_num_in_poc_cycle; i++)
321  expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
322  } else
323  expectedpoc = 0;
324 
325  if (nal_ref_idc == 0)
326  expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
327 
328  field_poc[0] = expectedpoc + pc->delta_poc[0];
329  field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
330 
331  if (picture_structure == PICT_FRAME)
332  field_poc[1] += pc->delta_poc[1];
333  } else {
334  int poc = 2 * (pc->frame_num_offset + pc->frame_num);
335 
336  if (!nal_ref_idc)
337  poc--;
338 
339  field_poc[0] = poc;
340  field_poc[1] = poc;
341  }
342 
343  if ( field_poc[0] != (int)field_poc[0]
344  || field_poc[1] != (int)field_poc[1])
345  return AVERROR_INVALIDDATA;
346 
347  if (picture_structure != PICT_BOTTOM_FIELD)
348  pic_field_poc[0] = field_poc[0];
349  if (picture_structure != PICT_TOP_FIELD)
350  pic_field_poc[1] = field_poc[1];
351  *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
352 
353  return 0;
354 }
355 
356 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
357  int is_avc, void *logctx)
358 {
359  H2645Packet pkt = { 0 };
360  int i, ret = 0;
361 
362  ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1);
363  if (ret < 0) {
364  ret = 0;
365  goto fail;
366  }
367 
368  for (i = 0; i < pkt.nb_nals; i++) {
369  H2645NAL *nal = &pkt.nals[i];
370  switch (nal->type) {
371  case H264_NAL_SPS:
372  ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 0);
373  if (ret < 0)
374  goto fail;
375  break;
376  case H264_NAL_PPS:
377  ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
378  nal->size_bits);
379  if (ret < 0)
380  goto fail;
381  break;
382  default:
383  av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
384  nal->type);
385  break;
386  }
387  }
388 
389 fail:
391  return ret;
392 }
393 
394 /* There are (invalid) samples in the wild with mp4-style extradata, where the
395  * parameter sets are stored unescaped (i.e. as RBSP).
396  * This function catches the parameter set decoding failure and tries again
397  * after escaping it */
398 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
399  int err_recognition, void *logctx)
400 {
401  int ret;
402 
403  ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
404  if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
405  GetByteContext gbc;
406  PutByteContext pbc;
407  uint8_t *escaped_buf;
408  int escaped_buf_size;
409 
410  av_log(logctx, AV_LOG_WARNING,
411  "SPS decoding failure, trying again after escaping the NAL\n");
412 
413  if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
414  return AVERROR(ERANGE);
415  escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
416  escaped_buf = av_mallocz(escaped_buf_size);
417  if (!escaped_buf)
418  return AVERROR(ENOMEM);
419 
420  bytestream2_init(&gbc, buf, buf_size);
421  bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
422 
423  while (bytestream2_get_bytes_left(&gbc)) {
424  if (bytestream2_get_bytes_left(&gbc) >= 3 &&
425  bytestream2_peek_be24(&gbc) <= 3) {
426  bytestream2_put_be24(&pbc, 3);
427  bytestream2_skip(&gbc, 2);
428  } else
429  bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
430  }
431 
432  escaped_buf_size = bytestream2_tell_p(&pbc);
433  AV_WB16(escaped_buf, escaped_buf_size - 2);
434 
435  (void)decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
436  // lorex.mp4 decodes ok even with extradata decoding failing
437  av_freep(&escaped_buf);
438  }
439 
440  return 0;
441 }
442 
444  int *is_avc, int *nal_length_size,
445  int err_recognition, void *logctx)
446 {
447  int ret;
448 
449  if (!data || size <= 0)
450  return -1;
451 
452  if (data[0] == 1) {
453  int i, cnt, nalsize;
454  const uint8_t *p = data;
455 
456  *is_avc = 1;
457 
458  if (size < 7) {
459  av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
460  return AVERROR_INVALIDDATA;
461  }
462 
463  // Decode sps from avcC
464  cnt = *(p + 5) & 0x1f; // Number of sps
465  p += 6;
466  for (i = 0; i < cnt; i++) {
467  nalsize = AV_RB16(p) + 2;
468  if (nalsize > size - (p - data))
469  return AVERROR_INVALIDDATA;
470  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
471  if (ret < 0) {
472  av_log(logctx, AV_LOG_ERROR,
473  "Decoding sps %d from avcC failed\n", i);
474  return ret;
475  }
476  p += nalsize;
477  }
478  // Decode pps from avcC
479  cnt = *(p++); // Number of pps
480  for (i = 0; i < cnt; i++) {
481  nalsize = AV_RB16(p) + 2;
482  if (nalsize > size - (p - data))
483  return AVERROR_INVALIDDATA;
484  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
485  if (ret < 0) {
486  av_log(logctx, AV_LOG_ERROR,
487  "Decoding pps %d from avcC failed\n", i);
488  return ret;
489  }
490  p += nalsize;
491  }
492  // Store right nal length size that will be used to parse all other nals
493  *nal_length_size = (data[4] & 0x03) + 1;
494  } else {
495  *is_avc = 0;
496  ret = decode_extradata_ps(data, size, ps, 0, logctx);
497  if (ret < 0)
498  return ret;
499  }
500  return size;
501 }
502 
503 /**
504  * Compute profile from profile_idc and constraint_set?_flags.
505  *
506  * @param sps SPS
507  *
508  * @return profile as defined by FF_PROFILE_H264_*
509  */
511 {
512  int profile = sps->profile_idc;
513 
514  switch (sps->profile_idc) {
516  // constraint_set1_flag set to 1
517  profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
518  break;
522  // constraint_set3_flag set to 1
523  profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
524  break;
525  }
526 
527  return profile;
528 }
int chroma_format_idc
Definition: h264_ps.h:48
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int bit_length)
Decode PPS.
Definition: h264_ps.c:724
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:346
#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:398
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:39
Sequence parameter set.
Definition: h264_ps.h:44
#define FF_PROFILE_H264_INTRA
Definition: avcodec.h:2883
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:115
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:272
Picture parameter set.
Definition: h264_ps.h:109
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:236
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:46
int size_bits
Size, in bits, of just the data, excluding the stop bit and any trailing padding. ...
Definition: h2645_parse.h:41
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE
Definition: avcodec.h:2897
#define FF_PROFILE_H264_BASELINE
Definition: avcodec.h:2885
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
int offset_for_non_ref_pic
Definition: h264_ps.h:54
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:469
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:443
#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:131
static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps, int is_avc, void *logctx)
Definition: h264_parse.c:356
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:51
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:510
#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:2893
#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:117
int offset_for_top_to_bottom_field
Definition: h264_ps.h:55
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:219
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:56
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
H.264 / AVC / MPEG-4 part10 codec.
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2656
#define LEFT_DC_PRED8x8
Definition: h264pred.h:74
int type
NAL unit type.
Definition: h2645_parse.h:51
short offset_for_ref_frame[256]
Definition: h264_ps.h:84
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:644
int constraint_set_flags
constraint_set[0-3]_flag
Definition: h264_ps.h:101
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:321
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:53
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:52
mfxU16 profile
Definition: qsvenc.c:44
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
int
if(ret< 0)
Definition: vf_mcdeint.c:279
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:179
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:50
Bi-dir predicted.
Definition: avutil.h:276
GetBitContext gb
Definition: h2645_parse.h:46
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:776
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:333
H2645NAL * nals
Definition: h2645_parse.h:75
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, int picture_structure, void *logctx)
Definition: h264_parse.c:27
#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:2882
H.264 decoder/parser shared code.
#define FF_PROFILE_H264_HIGH_10
Definition: avcodec.h:2890
exp golomb vlc stuff
mode
Use these values in ebur128_init (or'ed).
Definition: ebur128.h:83