FFmpeg  3.4.9
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  unsigned int mb, last_mb = p->parse_last_mb;
125  GetBitContext gb;
126  p->parse_history[p->parse_history_count++] = buf[i];
127 
129  mb= get_ue_golomb_long(&gb);
130  if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
131  p->parse_last_mb = mb;
132  if (pc->frame_start_found) {
133  if (mb <= last_mb) {
134  i -= p->parse_history_count - 1;
135  p->parse_history_count = 0;
136  goto found;
137  }
138  } else
139  pc->frame_start_found = 1;
140  p->parse_history_count = 0;
141  state = 7;
142  }
143  }
144  }
145  pc->state = state;
146  if (p->is_avc)
147  return next_avc;
148  return END_NOT_FOUND;
149 
150 found:
151  pc->state = 7;
152  pc->frame_start_found = 0;
153  if (p->is_avc)
154  return next_avc;
155  return i - (state & 5);
156 }
157 
159  void *logctx)
160 {
162  int slice_type_nos = s->pict_type & 3;
163  H264ParseContext *p = s->priv_data;
164  int list_count, ref_count[2];
165 
166 
168  get_ue_golomb(gb); // redundant_pic_count
169 
170  if (slice_type_nos == AV_PICTURE_TYPE_B)
171  get_bits1(gb); // direct_spatial_mv_pred
172 
173  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
174  slice_type_nos, p->picture_structure, logctx) < 0)
175  return AVERROR_INVALIDDATA;
176 
177  if (slice_type_nos != AV_PICTURE_TYPE_I) {
178  int list;
179  for (list = 0; list < list_count; list++) {
180  if (get_bits1(gb)) {
181  int index;
182  for (index = 0; ; index++) {
183  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
184 
185  if (reordering_of_pic_nums_idc < 3)
186  get_ue_golomb_long(gb);
187  else if (reordering_of_pic_nums_idc > 3) {
188  av_log(logctx, AV_LOG_ERROR,
189  "illegal reordering_of_pic_nums_idc %d\n",
190  reordering_of_pic_nums_idc);
191  return AVERROR_INVALIDDATA;
192  } else
193  break;
194 
195  if (index >= ref_count[list]) {
196  av_log(logctx, AV_LOG_ERROR,
197  "reference count %d overflow\n", index);
198  return AVERROR_INVALIDDATA;
199  }
200  }
201  }
202  }
203  }
204 
205  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
206  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
207  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
208  &pwt, p->picture_structure, logctx);
209 
210  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
211  int i;
212  for (i = 0; i < MAX_MMCO_COUNT; i++) {
213  MMCOOpcode opcode = get_ue_golomb_31(gb);
214  if (opcode > (unsigned) MMCO_LONG) {
215  av_log(logctx, AV_LOG_ERROR,
216  "illegal memory management control operation %d\n",
217  opcode);
218  return AVERROR_INVALIDDATA;
219  }
220  if (opcode == MMCO_END)
221  return 0;
222  else if (opcode == MMCO_RESET)
223  return 1;
224 
225  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
226  get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
227  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
228  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
229  get_ue_golomb_31(gb);
230  }
231  }
232 
233  return 0;
234 }
235 
236 /**
237  * Parse NAL units of found picture and decode some basic information.
238  *
239  * @param s parser context.
240  * @param avctx codec context.
241  * @param buf buffer with field/frame data.
242  * @param buf_size size of the buffer.
243  */
245  AVCodecContext *avctx,
246  const uint8_t * const buf, int buf_size)
247 {
248  H264ParseContext *p = s->priv_data;
249  H2645NAL nal = { NULL };
250  int buf_index, next_avc;
251  unsigned int pps_id;
252  unsigned int slice_type;
253  int state = -1, got_reset = 0;
254  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
255  int field_poc[2];
256  int ret;
257 
258  /* set some sane default values */
260  s->key_frame = 0;
262 
263  ff_h264_sei_uninit(&p->sei);
265 
266  if (!buf_size)
267  return 0;
268 
269  buf_index = 0;
270  next_avc = p->is_avc ? 0 : buf_size;
271  for (;;) {
272  const SPS *sps;
273  int src_length, consumed, nalsize = 0;
274 
275  if (buf_index >= next_avc) {
276  nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
277  if (nalsize < 0)
278  break;
279  next_avc = buf_index + nalsize;
280  } else {
281  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
282  if (buf_index >= buf_size)
283  break;
284  if (buf_index >= next_avc)
285  continue;
286  }
287  src_length = next_avc - buf_index;
288 
289  state = buf[buf_index];
290  switch (state & 0x1f) {
291  case H264_NAL_SLICE:
292  case H264_NAL_IDR_SLICE:
293  // Do not walk the whole buffer just to decode slice header
294  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
295  /* IDR or disposable slice
296  * No need to decode many bytes because MMCOs shall not be present. */
297  if (src_length > 60)
298  src_length = 60;
299  } else {
300  /* To decode up to MMCOs */
301  if (src_length > 1000)
302  src_length = 1000;
303  }
304  break;
305  }
306  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &nal, 1);
307  if (consumed < 0)
308  break;
309 
310  buf_index += consumed;
311 
312  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
313  if (ret < 0)
314  goto fail;
315  get_bits1(&nal.gb);
316  nal.ref_idc = get_bits(&nal.gb, 2);
317  nal.type = get_bits(&nal.gb, 5);
318 
319  switch (nal.type) {
320  case H264_NAL_SPS:
321  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
322  break;
323  case H264_NAL_PPS:
324  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
325  nal.size_bits);
326  break;
327  case H264_NAL_SEI:
328  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
329  break;
330  case H264_NAL_IDR_SLICE:
331  s->key_frame = 1;
332 
333  p->poc.prev_frame_num = 0;
334  p->poc.prev_frame_num_offset = 0;
335  p->poc.prev_poc_msb =
336  p->poc.prev_poc_lsb = 0;
337  /* fall through */
338  case H264_NAL_SLICE:
339  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
340  slice_type = get_ue_golomb_31(&nal.gb);
341  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
342  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
343  /* key frame, since recovery_frame_cnt is set */
344  s->key_frame = 1;
345  }
346  pps_id = get_ue_golomb(&nal.gb);
347  if (pps_id >= MAX_PPS_COUNT) {
348  av_log(avctx, AV_LOG_ERROR,
349  "pps_id %u out of range\n", pps_id);
350  goto fail;
351  }
352  if (!p->ps.pps_list[pps_id]) {
353  av_log(avctx, AV_LOG_ERROR,
354  "non-existing PPS %u referenced\n", pps_id);
355  goto fail;
356  }
357 
360  p->ps.pps = NULL;
361  p->ps.sps = NULL;
362  p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
363  if (!p->ps.pps_ref)
364  goto fail;
365  p->ps.pps = (const PPS*)p->ps.pps_ref->data;
366 
367  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
368  av_log(avctx, AV_LOG_ERROR,
369  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
370  goto fail;
371  }
372 
373  p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
374  if (!p->ps.sps_ref)
375  goto fail;
376  p->ps.sps = (const SPS*)p->ps.sps_ref->data;
377 
378  sps = p->ps.sps;
379 
380  // heuristic to detect non marked keyframes
381  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
382  s->key_frame = 1;
383 
384  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
385 
386  s->coded_width = 16 * sps->mb_width;
387  s->coded_height = 16 * sps->mb_height;
388  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
389  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
390  if (s->width <= 0 || s->height <= 0) {
391  s->width = s->coded_width;
392  s->height = s->coded_height;
393  }
394 
395  switch (sps->bit_depth_luma) {
396  case 9:
397  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
398  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
399  else s->format = AV_PIX_FMT_YUV420P9;
400  break;
401  case 10:
402  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
403  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
404  else s->format = AV_PIX_FMT_YUV420P10;
405  break;
406  case 8:
407  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
408  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
409  else s->format = AV_PIX_FMT_YUV420P;
410  break;
411  default:
412  s->format = AV_PIX_FMT_NONE;
413  }
414 
415  avctx->profile = ff_h264_get_profile(sps);
416  avctx->level = sps->level_idc;
417 
418  if (sps->frame_mbs_only_flag) {
420  } else {
421  if (get_bits1(&nal.gb)) { // field_pic_flag
422  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
423  } else {
425  }
426  }
427 
428  if (nal.type == H264_NAL_IDR_SLICE)
429  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
430  if (sps->poc_type == 0) {
431  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
432 
433  if (p->ps.pps->pic_order_present == 1 &&
436  }
437 
438  if (sps->poc_type == 1 &&
440  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
441 
442  if (p->ps.pps->pic_order_present == 1 &&
444  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
445  }
446 
447  /* Decode POC of this picture.
448  * The prev_ values needed for decoding POC of the next picture are not set here. */
449  field_poc[0] = field_poc[1] = INT_MAX;
450  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
451  &p->poc, p->picture_structure, nal.ref_idc);
452 
453  /* Continue parsing to check if MMCO_RESET is present.
454  * FIXME: MMCO_RESET could appear in non-first slice.
455  * Maybe, we should parse all undisposable non-IDR slice of this
456  * picture until encountering MMCO_RESET in a slice of it. */
457  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
458  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
459  if (got_reset < 0)
460  goto fail;
461  }
462 
463  /* Set up the prev_ values for decoding POC of the next picture. */
464  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
465  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
466  if (nal.ref_idc != 0) {
467  if (!got_reset) {
468  p->poc.prev_poc_msb = p->poc.poc_msb;
469  p->poc.prev_poc_lsb = p->poc.poc_lsb;
470  } else {
471  p->poc.prev_poc_msb = 0;
472  p->poc.prev_poc_lsb =
473  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
474  }
475  }
476 
478  switch (p->sei.picture_timing.pic_struct) {
481  s->repeat_pict = 0;
482  break;
486  s->repeat_pict = 1;
487  break;
490  s->repeat_pict = 2;
491  break;
493  s->repeat_pict = 3;
494  break;
496  s->repeat_pict = 5;
497  break;
498  default:
499  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
500  break;
501  }
502  } else {
503  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
504  }
505 
506  if (p->picture_structure == PICT_FRAME) {
509  switch (p->sei.picture_timing.pic_struct) {
513  break;
517  break;
518  default:
520  break;
521  }
522  } else {
523  if (field_poc[0] < field_poc[1])
525  else if (field_poc[0] > field_poc[1])
527  else
529  }
530  } else {
533  else
535  if (p->poc.frame_num == p->last_frame_num &&
541  else
543  } else {
545  }
547  p->last_frame_num = p->poc.frame_num;
548  }
549 
550  av_freep(&nal.rbsp_buffer);
551  return 0; /* no need to evaluate the rest */
552  }
553  }
554  if (q264) {
555  av_freep(&nal.rbsp_buffer);
556  return 0;
557  }
558  /* didn't find a picture! */
559  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
560 fail:
561  av_freep(&nal.rbsp_buffer);
562  return -1;
563 }
564 
566  AVCodecContext *avctx,
567  const uint8_t **poutbuf, int *poutbuf_size,
568  const uint8_t *buf, int buf_size)
569 {
570  H264ParseContext *p = s->priv_data;
571  ParseContext *pc = &p->pc;
572  int next;
573 
574  if (!p->got_first) {
575  p->got_first = 1;
576  if (avctx->extradata_size) {
578  &p->ps, &p->is_avc, &p->nal_length_size,
579  avctx->err_recognition, avctx);
580  }
581  }
582 
584  next = buf_size;
585  } else {
586  next = h264_find_frame_end(p, buf, buf_size, avctx);
587 
588  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
589  *poutbuf = NULL;
590  *poutbuf_size = 0;
591  return buf_size;
592  }
593 
594  if (next < 0 && next != END_NOT_FOUND) {
595  av_assert1(pc->last_index + next >= 0);
596  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
597  }
598  }
599 
600  parse_nal_units(s, avctx, buf, buf_size);
601 
602  if (avctx->framerate.num)
603  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
604  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
608  } else {
609  s->dts_sync_point = INT_MIN;
610  s->dts_ref_dts_delta = INT_MIN;
611  s->pts_dts_delta = INT_MIN;
612  }
613 
614  if (s->flags & PARSER_FLAG_ONCE) {
616  }
617 
618  if (s->dts_sync_point >= 0) {
619  int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
620  if (den > 0) {
621  int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
622  if (s->dts != AV_NOPTS_VALUE) {
623  // got DTS from the stream, update reference timestamp
624  p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
625  } else if (p->reference_dts != AV_NOPTS_VALUE) {
626  // compute DTS based on reference timestamp
627  s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
628  }
629 
630  if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
631  s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
632 
633  if (s->dts_sync_point > 0)
634  p->reference_dts = s->dts; // new reference
635  }
636  }
637 
638  *poutbuf = buf;
639  *poutbuf_size = buf_size;
640  return next;
641 }
642 
643 static int h264_split(AVCodecContext *avctx,
644  const uint8_t *buf, int buf_size)
645 {
646  uint32_t state = -1;
647  int has_sps = 0;
648  int has_pps = 0;
649  const uint8_t *ptr = buf, *end = buf + buf_size;
650  int nalu_type;
651 
652  while (ptr < end) {
653  ptr = avpriv_find_start_code(ptr, end, &state);
654  if ((state & 0xFFFFFF00) != 0x100)
655  break;
656  nalu_type = state & 0x1F;
657  if (nalu_type == H264_NAL_SPS) {
658  has_sps = 1;
659  } else if (nalu_type == H264_NAL_PPS)
660  has_pps = 1;
661  /* else if (nalu_type == 0x01 ||
662  * nalu_type == 0x02 ||
663  * nalu_type == 0x05) {
664  * }
665  */
666  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
667  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
668  nalu_type != 0x0f) {
669  if (has_sps) {
670  while (ptr - 4 > buf && ptr[-5] == 0)
671  ptr--;
672  return ptr - 4 - buf;
673  }
674  }
675  }
676 
677  return 0;
678 }
679 
681 {
682  H264ParseContext *p = s->priv_data;
683  ParseContext *pc = &p->pc;
684 
685  av_freep(&pc->buffer);
686 
687  ff_h264_sei_uninit(&p->sei);
688  ff_h264_ps_uninit(&p->ps);
689 }
690 
692 {
693  H264ParseContext *p = s->priv_data;
694 
696  p->last_frame_num = INT_MAX;
697  ff_h264dsp_init(&p->h264dsp, 8, 1);
698  return 0;
699 }
700 
703  .priv_data_size = sizeof(H264ParseContext),
704  .parser_init = init,
705  .parser_parse = h264_parse,
706  .parser_close = h264_close,
707  .split = h264_split,
708 };
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
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3460
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:35
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:185
static struct @260 state
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:262
int weighted_bipred_idc
Definition: h264_ps.h:117
Memory handling functions.
AVBufferRef * sps_list[MAX_SPS_COUNT]
Definition: h264_ps.h:139
int last_picture_structure
Definition: h264_parser.c:64
ParseContext pc
Definition: h264_parser.c:51
int frame_packing_arrangement_cancel_flag
is previous arrangement canceled, -1 if never received
Definition: h264_sei.h:123
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5314
Sequence parameter set.
Definition: h264_ps.h:44
uint8_t parse_history[6]
Definition: h264_parser.c:60
enum AVFieldOrder field_order
Definition: avcodec.h:5291
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:115
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:272
int codec_ids[5]
Definition: avcodec.h:5335
Picture parameter set.
Definition: h264_ps.h:109
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5320
Convenience header that includes libavutil&#39;s core.
int frame_mbs_only_flag
Definition: h264_ps.h:62
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264dec.h:815
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
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:5251
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:244
int profile
profile
Definition: avcodec.h:3266
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:42
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1898
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264_ps.h:70
const PPS * pps
Definition: h264_ps.h:145
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5301
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:68
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:69
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1876
int ff_h2645_extract_rbsp(const uint8_t *src, int length, H2645NAL *nal, int small_padding)
Extract the raw (unescaped) bitstream.
Definition: h2645_parse.c:32
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:440
#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:123
bitstream reader API header.
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: h264dsp.h:117
#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.
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3474
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:589
H.264 parameter set handling.
H264POCContext poc
Definition: h264_parser.c:54
AVBufferRef * sps_ref
Definition: h264_ps.h:143
#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:55
error code definitions
int poc_type
pic_order_cnt_type
Definition: h264_ps.h:51
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:507
int present
Buffering period SEI flag.
Definition: h264_sei.h:116
int weighted_pred
weighted_pred_flag
Definition: h264_ps.h:116
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:386
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:109
int delta_pic_order_always_zero_flag
Definition: h264_ps.h:53
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:70
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
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:381
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:57
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:3050
#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 level
level
Definition: avcodec.h:3364
static int get_nalsize(int nal_length_size, const uint8_t *buf, int buf_size, int *buf_index, void *logctx)
Definition: h2645_parse.h:93
int cpb_removal_delay
cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
Definition: h264_sei.h:87
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:65
if(ret< 0)
Definition: vf_mcdeint.c:279
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:382
int type
NAL unit type.
Definition: h2645_parse.h:52
AVCodecParser ff_h264_parser
Definition: h264_parser.c:701
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:87
int pic_order_present
pic_order_present_flag
Definition: h264_ps.h:112
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:680
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:5265
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:140
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:102
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:457
main external API structure.
Definition: avcodec.h:1761
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:36
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:1877
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:314
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:383
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:643
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:426
H264SEIBufferingPeriod buffering_period
Definition: h264_sei.h:160
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:380
const SPS * sps
Definition: h264_ps.h:146
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264_ps.h:110
H264SEIPictureTiming picture_timing
Definition: h264_sei.h:155
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:52
H264SEIRecoveryPoint recovery_point
Definition: h264_sei.h:159
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:5309
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:384
int pic_struct_present_flag
Definition: h264_ps.h:92
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:5202
int mb_height
Definition: h264_ps.h:61
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
int dpb_output_delay
dpb_output_delay in picture timing SEI message, see H.264 C.2.2
Definition: h264_sei.h:82
AVBufferRef * pps_ref
Definition: h264_ps.h:142
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:50
H264SEIFramePacking frame_packing
Definition: h264_sei.h:161
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:5201
int den
Denominator.
Definition: rational.h:60
void ff_h264_ps_uninit(H264ParamSets *ps)
Uninit H264 param sets structure.
Definition: h264_ps.c:316
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:691
GetBitContext gb
Definition: h2645_parse.h:47
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264_ps.h:98
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:333
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5331
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:59
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:5185
uint8_t * rbsp_buffer
Definition: h2645_parse.h:32
#define av_freep(p)
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx)
Definition: h264_sei.c:399
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:565
int64_t reference_dts
Definition: h264_parser.c:63
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264_ps.h:71
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:5216
int level_idc
Definition: h264_ps.h:47
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:5236
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, void *logctx)
Definition: h264_parser.c:158
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