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h264_parser.c
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1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... parser
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 / MPEG-4 part10 parser.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include <assert.h>
31 #include <stdint.h>
32 
33 #include "libavutil/avutil.h"
34 #include "libavutil/error.h"
35 #include "libavutil/log.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/pixfmt.h"
38 
39 #include "avcodec.h"
40 #include "get_bits.h"
41 #include "golomb.h"
42 #include "h264.h"
43 #include "h264_sei.h"
44 #include "h264_ps.h"
45 #include "h264data.h"
46 #include "internal.h"
47 #include "mpegutils.h"
48 #include "parser.h"
49 
50 typedef struct H264ParseContext {
56  int is_avc;
58  int got_first;
63  int64_t reference_dts;
66 
67 
69  int buf_size, void *logctx)
70 {
71  int i, j;
72  uint32_t state;
73  ParseContext *pc = &p->pc;
74 
75  int next_avc = p->is_avc ? 0 : buf_size;
76 // mb_addr= pc->mb_addr - 1;
77  state = pc->state;
78  if (state > 13)
79  state = 7;
80 
81  if (p->is_avc && !p->nal_length_size)
82  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
83 
84  for (i = 0; i < buf_size; i++) {
85  if (i >= next_avc) {
86  int nalsize = 0;
87  i = next_avc;
88  for (j = 0; j < p->nal_length_size; j++)
89  nalsize = (nalsize << 8) | buf[i++];
90  if (nalsize <= 0 || nalsize > buf_size - i) {
91  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
92  return buf_size;
93  }
94  next_avc = i + nalsize;
95  state = 5;
96  }
97 
98  if (state == 7) {
99  i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
100  if (i < next_avc)
101  state = 2;
102  } else if (state <= 2) {
103  if (buf[i] == 1)
104  state ^= 5; // 2->7, 1->4, 0->5
105  else if (buf[i])
106  state = 7;
107  else
108  state >>= 1; // 2->1, 1->0, 0->0
109  } else if (state <= 5) {
110  int nalu_type = buf[i] & 0x1F;
111  if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
112  nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
113  if (pc->frame_start_found) {
114  i++;
115  goto found;
116  }
117  } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
118  nalu_type == H264_NAL_IDR_SLICE) {
119  state += 8;
120  continue;
121  }
122  state = 7;
123  } else {
124  p->parse_history[p->parse_history_count++] = buf[i];
125  if (p->parse_history_count > 5) {
126  unsigned int mb, last_mb = p->parse_last_mb;
127  GetBitContext gb;
128 
130  p->parse_history_count = 0;
131  mb= get_ue_golomb_long(&gb);
132  p->parse_last_mb = mb;
133  if (pc->frame_start_found) {
134  if (mb <= last_mb)
135  goto found;
136  } else
137  pc->frame_start_found = 1;
138  state = 7;
139  }
140  }
141  }
142  pc->state = state;
143  if (p->is_avc)
144  return next_avc;
145  return END_NOT_FOUND;
146 
147 found:
148  pc->state = 7;
149  pc->frame_start_found = 0;
150  if (p->is_avc)
151  return next_avc;
152  return i - (state & 5) - 5 * (state > 7);
153 }
154 
156  void *logctx)
157 {
159  int slice_type_nos = s->pict_type & 3;
160  H264ParseContext *p = s->priv_data;
161  int list_count, ref_count[2];
162 
163 
165  get_ue_golomb(gb); // redundant_pic_count
166 
167  if (slice_type_nos == AV_PICTURE_TYPE_B)
168  get_bits1(gb); // direct_spatial_mv_pred
169 
170  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
171  slice_type_nos, p->picture_structure, logctx) < 0)
172  return AVERROR_INVALIDDATA;
173 
174  if (slice_type_nos != AV_PICTURE_TYPE_I) {
175  int list;
176  for (list = 0; list < list_count; list++) {
177  if (get_bits1(gb)) {
178  int index;
179  for (index = 0; ; index++) {
180  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
181 
182  if (reordering_of_pic_nums_idc < 3)
183  get_ue_golomb_long(gb);
184  else if (reordering_of_pic_nums_idc > 3) {
185  av_log(logctx, AV_LOG_ERROR,
186  "illegal reordering_of_pic_nums_idc %d\n",
187  reordering_of_pic_nums_idc);
188  return AVERROR_INVALIDDATA;
189  } else
190  break;
191 
192  if (index >= ref_count[list]) {
193  av_log(logctx, AV_LOG_ERROR,
194  "reference count %d overflow\n", index);
195  return AVERROR_INVALIDDATA;
196  }
197  }
198  }
199  }
200  }
201 
202  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
203  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
204  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
205  &pwt, p->picture_structure, logctx);
206 
207  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
208  int i;
209  for (i = 0; i < MAX_MMCO_COUNT; i++) {
210  MMCOOpcode opcode = get_ue_golomb_31(gb);
211  if (opcode > (unsigned) MMCO_LONG) {
212  av_log(logctx, AV_LOG_ERROR,
213  "illegal memory management control operation %d\n",
214  opcode);
215  return AVERROR_INVALIDDATA;
216  }
217  if (opcode == MMCO_END)
218  return 0;
219  else if (opcode == MMCO_RESET)
220  return 1;
221 
222  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
223  get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
224  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
225  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
226  get_ue_golomb_31(gb);
227  }
228  }
229 
230  return 0;
231 }
232 
233 /**
234  * Parse NAL units of found picture and decode some basic information.
235  *
236  * @param s parser context.
237  * @param avctx codec context.
238  * @param buf buffer with field/frame data.
239  * @param buf_size size of the buffer.
240  */
242  AVCodecContext *avctx,
243  const uint8_t * const buf, int buf_size)
244 {
245  H264ParseContext *p = s->priv_data;
246  H2645RBSP rbsp = { NULL };
247  H2645NAL nal = { NULL };
248  int buf_index, next_avc;
249  unsigned int pps_id;
250  unsigned int slice_type;
251  int state = -1, got_reset = 0;
252  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
253  int field_poc[2];
254  int ret;
255 
256  /* set some sane default values */
258  s->key_frame = 0;
260 
261  ff_h264_sei_uninit(&p->sei);
263 
264  if (!buf_size)
265  return 0;
266 
268  if (!rbsp.rbsp_buffer)
269  return AVERROR(ENOMEM);
270 
271  buf_index = 0;
272  next_avc = p->is_avc ? 0 : buf_size;
273  for (;;) {
274  const SPS *sps;
275  int src_length, consumed, nalsize = 0;
276 
277  if (buf_index >= next_avc) {
278  nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
279  if (nalsize < 0)
280  break;
281  next_avc = buf_index + nalsize;
282  } else {
283  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
284  if (buf_index >= buf_size)
285  break;
286  if (buf_index >= next_avc)
287  continue;
288  }
289  src_length = next_avc - buf_index;
290 
291  state = buf[buf_index];
292  switch (state & 0x1f) {
293  case H264_NAL_SLICE:
294  case H264_NAL_IDR_SLICE:
295  // Do not walk the whole buffer just to decode slice header
296  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
297  /* IDR or disposable slice
298  * No need to decode many bytes because MMCOs shall not be present. */
299  if (src_length > 60)
300  src_length = 60;
301  } else {
302  /* To decode up to MMCOs */
303  if (src_length > 1000)
304  src_length = 1000;
305  }
306  break;
307  }
308  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
309  if (consumed < 0)
310  break;
311 
312  buf_index += consumed;
313 
314  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
315  if (ret < 0)
316  goto fail;
317  get_bits1(&nal.gb);
318  nal.ref_idc = get_bits(&nal.gb, 2);
319  nal.type = get_bits(&nal.gb, 5);
320 
321  switch (nal.type) {
322  case H264_NAL_SPS:
323  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
324  break;
325  case H264_NAL_PPS:
326  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
327  nal.size_bits);
328  break;
329  case H264_NAL_SEI:
330  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
331  break;
332  case H264_NAL_IDR_SLICE:
333  s->key_frame = 1;
334 
335  p->poc.prev_frame_num = 0;
336  p->poc.prev_frame_num_offset = 0;
337  p->poc.prev_poc_msb =
338  p->poc.prev_poc_lsb = 0;
339  /* fall through */
340  case H264_NAL_SLICE:
341  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
342  slice_type = get_ue_golomb_31(&nal.gb);
343  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
344  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
345  /* key frame, since recovery_frame_cnt is set */
346  s->key_frame = 1;
347  }
348  pps_id = get_ue_golomb(&nal.gb);
349  if (pps_id >= MAX_PPS_COUNT) {
350  av_log(avctx, AV_LOG_ERROR,
351  "pps_id %u out of range\n", pps_id);
352  goto fail;
353  }
354  if (!p->ps.pps_list[pps_id]) {
355  av_log(avctx, AV_LOG_ERROR,
356  "non-existing PPS %u referenced\n", pps_id);
357  goto fail;
358  }
359 
362  p->ps.pps = NULL;
363  p->ps.sps = NULL;
364  p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
365  if (!p->ps.pps_ref)
366  goto fail;
367  p->ps.pps = (const PPS*)p->ps.pps_ref->data;
368 
369  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
370  av_log(avctx, AV_LOG_ERROR,
371  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
372  goto fail;
373  }
374 
375  p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
376  if (!p->ps.sps_ref)
377  goto fail;
378  p->ps.sps = (const SPS*)p->ps.sps_ref->data;
379 
380  sps = p->ps.sps;
381 
382  // heuristic to detect non marked keyframes
383  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
384  s->key_frame = 1;
385 
386  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
387 
388  s->coded_width = 16 * sps->mb_width;
389  s->coded_height = 16 * sps->mb_height;
390  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
391  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
392  if (s->width <= 0 || s->height <= 0) {
393  s->width = s->coded_width;
394  s->height = s->coded_height;
395  }
396 
397  switch (sps->bit_depth_luma) {
398  case 9:
399  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
400  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
401  else s->format = AV_PIX_FMT_YUV420P9;
402  break;
403  case 10:
404  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
405  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
406  else s->format = AV_PIX_FMT_YUV420P10;
407  break;
408  case 8:
409  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
410  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
411  else s->format = AV_PIX_FMT_YUV420P;
412  break;
413  default:
414  s->format = AV_PIX_FMT_NONE;
415  }
416 
417  avctx->profile = ff_h264_get_profile(sps);
418  avctx->level = sps->level_idc;
419 
420  if (sps->frame_mbs_only_flag) {
422  } else {
423  if (get_bits1(&nal.gb)) { // field_pic_flag
424  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
425  } else {
427  }
428  }
429 
430  if (nal.type == H264_NAL_IDR_SLICE)
431  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
432  if (sps->poc_type == 0) {
433  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
434 
435  if (p->ps.pps->pic_order_present == 1 &&
438  }
439 
440  if (sps->poc_type == 1 &&
442  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
443 
444  if (p->ps.pps->pic_order_present == 1 &&
446  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
447  }
448 
449  /* Decode POC of this picture.
450  * The prev_ values needed for decoding POC of the next picture are not set here. */
451  field_poc[0] = field_poc[1] = INT_MAX;
452  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
453  &p->poc, p->picture_structure, nal.ref_idc);
454 
455  /* Continue parsing to check if MMCO_RESET is present.
456  * FIXME: MMCO_RESET could appear in non-first slice.
457  * Maybe, we should parse all undisposable non-IDR slice of this
458  * picture until encountering MMCO_RESET in a slice of it. */
459  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
460  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
461  if (got_reset < 0)
462  goto fail;
463  }
464 
465  /* Set up the prev_ values for decoding POC of the next picture. */
466  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
467  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
468  if (nal.ref_idc != 0) {
469  if (!got_reset) {
470  p->poc.prev_poc_msb = p->poc.poc_msb;
471  p->poc.prev_poc_lsb = p->poc.poc_lsb;
472  } else {
473  p->poc.prev_poc_msb = 0;
474  p->poc.prev_poc_lsb =
475  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
476  }
477  }
478 
480  switch (p->sei.picture_timing.pic_struct) {
483  s->repeat_pict = 0;
484  break;
488  s->repeat_pict = 1;
489  break;
492  s->repeat_pict = 2;
493  break;
495  s->repeat_pict = 3;
496  break;
498  s->repeat_pict = 5;
499  break;
500  default:
501  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
502  break;
503  }
504  } else {
505  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
506  }
507 
508  if (p->picture_structure == PICT_FRAME) {
511  switch (p->sei.picture_timing.pic_struct) {
515  break;
519  break;
520  default:
522  break;
523  }
524  } else {
525  if (field_poc[0] < field_poc[1])
527  else if (field_poc[0] > field_poc[1])
529  else
531  }
532  } else {
535  else
537  if (p->poc.frame_num == p->last_frame_num &&
543  else
545  } else {
547  }
549  p->last_frame_num = p->poc.frame_num;
550  }
551 
552  av_freep(&rbsp.rbsp_buffer);
553  return 0; /* no need to evaluate the rest */
554  }
555  }
556  if (q264) {
557  av_freep(&rbsp.rbsp_buffer);
558  return 0;
559  }
560  /* didn't find a picture! */
561  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
562 fail:
563  av_freep(&rbsp.rbsp_buffer);
564  return -1;
565 }
566 
568  AVCodecContext *avctx,
569  const uint8_t **poutbuf, int *poutbuf_size,
570  const uint8_t *buf, int buf_size)
571 {
572  H264ParseContext *p = s->priv_data;
573  ParseContext *pc = &p->pc;
574  int next;
575 
576  if (!p->got_first) {
577  p->got_first = 1;
578  if (avctx->extradata_size) {
580  &p->ps, &p->is_avc, &p->nal_length_size,
581  avctx->err_recognition, avctx);
582  }
583  }
584 
586  next = buf_size;
587  } else {
588  next = h264_find_frame_end(p, buf, buf_size, avctx);
589 
590  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
591  *poutbuf = NULL;
592  *poutbuf_size = 0;
593  return buf_size;
594  }
595 
596  if (next < 0 && next != END_NOT_FOUND) {
597  av_assert1(pc->last_index + next >= 0);
598  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
599  }
600  }
601 
602  parse_nal_units(s, avctx, buf, buf_size);
603 
604  if (avctx->framerate.num)
605  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
606  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
607  s->dts_sync_point = p->sei.buffering_period.present;
608  s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
609  s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
610  } else {
611  s->dts_sync_point = INT_MIN;
612  s->dts_ref_dts_delta = INT_MIN;
613  s->pts_dts_delta = INT_MIN;
614  }
615 
616  if (s->flags & PARSER_FLAG_ONCE) {
617  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
618  }
619 
620  if (s->dts_sync_point >= 0) {
621  int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
622  if (den > 0) {
623  int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
624  if (s->dts != AV_NOPTS_VALUE) {
625  // got DTS from the stream, update reference timestamp
626  p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
627  } else if (p->reference_dts != AV_NOPTS_VALUE) {
628  // compute DTS based on reference timestamp
629  s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
630  }
631 
632  if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
633  s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
634 
635  if (s->dts_sync_point > 0)
636  p->reference_dts = s->dts; // new reference
637  }
638  }
639 
640  *poutbuf = buf;
641  *poutbuf_size = buf_size;
642  return next;
643 }
644 
645 static int h264_split(AVCodecContext *avctx,
646  const uint8_t *buf, int buf_size)
647 {
648  uint32_t state = -1;
649  int has_sps = 0;
650  int has_pps = 0;
651  const uint8_t *ptr = buf, *end = buf + buf_size;
652  int nalu_type;
653 
654  while (ptr < end) {
655  ptr = avpriv_find_start_code(ptr, end, &state);
656  if ((state & 0xFFFFFF00) != 0x100)
657  break;
658  nalu_type = state & 0x1F;
659  if (nalu_type == H264_NAL_SPS) {
660  has_sps = 1;
661  } else if (nalu_type == H264_NAL_PPS)
662  has_pps = 1;
663  /* else if (nalu_type == 0x01 ||
664  * nalu_type == 0x02 ||
665  * nalu_type == 0x05) {
666  * }
667  */
668  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
669  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
670  nalu_type != 0x0f) {
671  if (has_sps) {
672  while (ptr - 4 > buf && ptr[-5] == 0)
673  ptr--;
674  return ptr - 4 - buf;
675  }
676  }
677  }
678 
679  return 0;
680 }
681 
683 {
684  H264ParseContext *p = s->priv_data;
685  ParseContext *pc = &p->pc;
686 
687  av_freep(&pc->buffer);
688 
689  ff_h264_sei_uninit(&p->sei);
690  ff_h264_ps_uninit(&p->ps);
691 }
692 
694 {
695  H264ParseContext *p = s->priv_data;
696 
698  p->last_frame_num = INT_MAX;
699  ff_h264dsp_init(&p->h264dsp, 8, 1);
700  return 0;
701 }
702 
705  .priv_data_size = sizeof(H264ParseContext),
706  .parser_init = init,
707  .parser_parse = h264_parse,
708  .parser_close = h264_close,
709  .split = h264_split,
710 };
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:725
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:2998
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
int recovery_frame_cnt
recovery_frame_cnt
Definition: h264_sei.h:112
int size
Definition: h2645_parse.h:34
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
int weighted_bipred_idc
Definition: h264_ps.h:116
Memory handling functions.
AVBufferRef * sps_list[MAX_SPS_COUNT]
Definition: h264_ps.h:138
int last_picture_structure
Definition: h264_parser.c:64
ParseContext pc
Definition: h264_parser.c:51
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5062
Sequence parameter set.
Definition: h264_ps.h:43
uint8_t parse_history[6]
Definition: h264_parser.c:60
enum AVFieldOrder field_order
Definition: avcodec.h:5039
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:114
int num
Numerator.
Definition: rational.h:59
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:269
int codec_ids[5]
Definition: avcodec.h:5083
Picture parameter set.
Definition: h264_ps.h:108
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5068
Convenience header that includes libavutil's core.
int frame_mbs_only_flag
Definition: h264_ps.h:61
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264dec.h:816
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:123
void ff_h264_sei_uninit(H264SEIContext *h)
Reset SEI values at the beginning of the frame.
Definition: h264_sei.c:41
H264DSPContext h264dsp
Definition: h264_parser.c:53
static int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *const buf, int buf_size)
Parse NAL units of found picture and decode some basic information.
Definition: h264_parser.c:241
int profile
profile
Definition: avcodec.h:2813
int frame_start_found
Definition: parser.h:34
int size_bits
Size, in bits, of just the data, excluding the stop bit and any trailing padding. ...
Definition: h2645_parse.h:41
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1610
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264_ps.h:69
const PPS * pps
Definition: h264_ps.h:144
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5049
4: bottom field, top field, in that order
Definition: h264_sei.h:48
uint8_t
#define av_cold
Definition: attributes.h:82
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264_ps.h:67
int frame_num_offset
for POC type 2
Definition: h264_parse.h:51
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264_ps.h:68
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1588
static struct @281 state
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:436
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
#define MAX_PPS_COUNT
Definition: h264_ps.h:38
int redundant_pic_cnt_present
redundant_pic_cnt_present_flag
Definition: h264_ps.h:122
bitstream reader API header.
#define av_log(a,...)
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
H.264 common definitions.
H.264 parameter set handling.
H264POCContext poc
Definition: h264_parser.c:54
AVBufferRef * sps_ref
Definition: h264_ps.h:142
#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
error code definitions
int poc_type
pic_order_cnt_type
Definition: h264_ps.h:50
H264ParamSets ps
Definition: h264_parser.c:52
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:251
int ff_h264_get_profile(const SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264_parse.c:503
#define AVERROR(e)
Definition: error.h:43
int weighted_pred
weighted_pred_flag
Definition: h264_ps.h:115
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:371
const uint8_t ff_h264_golomb_to_pict_type[5]
Definition: h264data.c:37
MMCOOpcode
Memory management control operation opcode.
Definition: h264dec.h:109
#define fail()
Definition: checkasm.h:112
int delta_pic_order_always_zero_flag
Definition: h264_ps.h:52
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
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:216
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:366
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:49
Context for storing H.264 DSP functions.
Definition: h264dsp.h:42
int ref_frame_count
num_ref_frames
Definition: h264_ps.h:56
H264_SEI_PicStructType pic_struct
Definition: h264_sei.h:70
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2612
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
int last_index
Definition: parser.h:31
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: h264dsp.h:117
int level
level
Definition: avcodec.h:2911
static int get_nalsize(int nal_length_size, const uint8_t *buf, int buf_size, int *buf_index, void *logctx)
Definition: h2645_parse.h:99
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1619
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:64
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:367
int type
NAL unit type.
Definition: h2645_parse.h:51
AVCodecParser ff_h264_parser
Definition: h264_parser.c:703
static unsigned get_ue_golomb_long(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
Definition: golomb.h:85
int pic_order_present
pic_order_present_flag
Definition: h264_ps.h:111
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:682
uint8_t * buffer
Definition: parser.h:29
5: top field, bottom field, top field repeated, in that order
Definition: h264_sei.h:49
Libavcodec external API header.
AVBufferRef * pps_list[MAX_PPS_COUNT]
Definition: h264_ps.h:139
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:100
int delta_poc_bottom
Definition: h264_parse.h:46
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:456
main external API structure.
Definition: avcodec.h:1488
H264SEIContext sei
Definition: h264_parser.c:55
uint8_t * data
The data buffer.
Definition: buffer.h:89
const uint8_t * data
Definition: h2645_parse.h:35
void * buf
Definition: avisynth_c.h:690
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
int extradata_size
Definition: avcodec.h:1589
int rbsp_buffer_alloc_size
Definition: h2645_parse.h:69
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:368
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:53
static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:645
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
uint8_t * rbsp_buffer
Definition: h2645_parse.h:68
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:425
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:365
const SPS * sps
Definition: h264_ps.h:145
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264_ps.h:109
H264SEIPictureTiming picture_timing
Definition: h264_sei.h:156
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:51
H264SEIRecoveryPoint recovery_point
Definition: h264_sei.h:160
3: top field, bottom field, in that order
Definition: h264_sei.h:47
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5057
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:369
int pic_struct_present_flag
Definition: h264_ps.h:91
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4950
int mb_height
Definition: h264_ps.h:60
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:279
AVBufferRef * pps_ref
Definition: h264_ps.h:141
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:49
H264SEIFramePacking frame_packing
Definition: h264_sei.h:162
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
Bi-dir predicted.
Definition: avutil.h:276
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4949
void ff_h264_ps_uninit(H264ParamSets *ps)
Uninit H264 param sets structure.
Definition: h264_ps.c:317
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:693
GetBitContext gb
Definition: h2645_parse.h:46
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264_ps.h:97
int delta_poc[2]
Definition: h264_parse.h:47
#define PICT_FRAME
Definition: mpegutils.h:39
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size, void *logctx)
Definition: h264_parser.c:68
pixel format definitions
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:334
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5079
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
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264_ps.h:58
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp.c:67
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4933
#define av_freep(p)
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx)
Definition: h264_sei.c:391
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:52
static int h264_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:567
int64_t reference_dts
Definition: h264_parser.c:63
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264_ps.h:70
exp golomb vlc stuff
int ff_h2645_extract_rbsp(const uint8_t *src, int length, H2645RBSP *rbsp, H2645NAL *nal, int small_padding)
Extract the raw (unescaped) bitstream.
Definition: h2645_parse.c:33
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4964
int level_idc
Definition: h264_ps.h:46
int arrangement_cancel_flag
is previous arrangement canceled, -1 if never received
Definition: h264_sei.h:123
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, void *logctx)
Definition: h264_parser.c:155
6: bottom field, top field, bottom field repeated, in that order
Definition: h264_sei.h:50
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
Predicted.
Definition: avutil.h:275
#define MAX_MMCO_COUNT
Definition: h264dec.h:54