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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;
64 
65 
67  int buf_size, void *logctx)
68 {
69  int i, j;
70  uint32_t state;
71  ParseContext *pc = &p->pc;
72 
73  int next_avc = p->is_avc ? 0 : buf_size;
74 // mb_addr= pc->mb_addr - 1;
75  state = pc->state;
76  if (state > 13)
77  state = 7;
78 
79  if (p->is_avc && !p->nal_length_size)
80  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
81 
82  for (i = 0; i < buf_size; i++) {
83  if (i >= next_avc) {
84  int nalsize = 0;
85  i = next_avc;
86  for (j = 0; j < p->nal_length_size; j++)
87  nalsize = (nalsize << 8) | buf[i++];
88  if (nalsize <= 0 || nalsize > buf_size - i) {
89  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
90  return buf_size;
91  }
92  next_avc = i + nalsize;
93  state = 5;
94  }
95 
96  if (state == 7) {
97  i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
98  if (i < next_avc)
99  state = 2;
100  } else if (state <= 2) {
101  if (buf[i] == 1)
102  state ^= 5; // 2->7, 1->4, 0->5
103  else if (buf[i])
104  state = 7;
105  else
106  state >>= 1; // 2->1, 1->0, 0->0
107  } else if (state <= 5) {
108  int nalu_type = buf[i] & 0x1F;
109  if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
110  nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
111  if (pc->frame_start_found) {
112  i++;
113  goto found;
114  }
115  } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
116  nalu_type == H264_NAL_IDR_SLICE) {
117  state += 8;
118  continue;
119  }
120  state = 7;
121  } else {
122  p->parse_history[p->parse_history_count++] = buf[i];
123  if (p->parse_history_count > 5) {
124  unsigned int mb, last_mb = p->parse_last_mb;
125  GetBitContext gb;
126 
128  p->parse_history_count = 0;
129  mb= get_ue_golomb_long(&gb);
130  p->parse_last_mb = mb;
131  if (pc->frame_start_found) {
132  if (mb <= last_mb)
133  goto found;
134  } else
135  pc->frame_start_found = 1;
136  state = 7;
137  }
138  }
139  }
140  pc->state = state;
141  if (p->is_avc)
142  return next_avc;
143  return END_NOT_FOUND;
144 
145 found:
146  pc->state = 7;
147  pc->frame_start_found = 0;
148  if (p->is_avc)
149  return next_avc;
150  return i - (state & 5) - 5 * (state > 7);
151 }
152 
154  void *logctx)
155 {
157  int slice_type_nos = s->pict_type & 3;
158  H264ParseContext *p = s->priv_data;
159  int list_count, ref_count[2];
160 
161 
163  get_ue_golomb(gb); // redundant_pic_count
164 
165  if (slice_type_nos == AV_PICTURE_TYPE_B)
166  get_bits1(gb); // direct_spatial_mv_pred
167 
168  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
169  slice_type_nos, p->picture_structure, logctx) < 0)
170  return AVERROR_INVALIDDATA;
171 
172  if (slice_type_nos != AV_PICTURE_TYPE_I) {
173  int list;
174  for (list = 0; list < list_count; list++) {
175  if (get_bits1(gb)) {
176  int index;
177  for (index = 0; ; index++) {
178  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
179 
180  if (reordering_of_pic_nums_idc < 3)
181  get_ue_golomb_long(gb);
182  else if (reordering_of_pic_nums_idc > 3) {
183  av_log(logctx, AV_LOG_ERROR,
184  "illegal reordering_of_pic_nums_idc %d\n",
185  reordering_of_pic_nums_idc);
186  return AVERROR_INVALIDDATA;
187  } else
188  break;
189 
190  if (index >= ref_count[list]) {
191  av_log(logctx, AV_LOG_ERROR,
192  "reference count %d overflow\n", index);
193  return AVERROR_INVALIDDATA;
194  }
195  }
196  }
197  }
198  }
199 
200  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
201  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
202  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
203  &pwt, logctx);
204 
205  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
206  int i;
207  for (i = 0; i < MAX_MMCO_COUNT; i++) {
208  MMCOOpcode opcode = get_ue_golomb_31(gb);
209  if (opcode > (unsigned) MMCO_LONG) {
210  av_log(logctx, AV_LOG_ERROR,
211  "illegal memory management control operation %d\n",
212  opcode);
213  return AVERROR_INVALIDDATA;
214  }
215  if (opcode == MMCO_END)
216  return 0;
217  else if (opcode == MMCO_RESET)
218  return 1;
219 
220  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
221  get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
222  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
223  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
224  get_ue_golomb_31(gb);
225  }
226  }
227 
228  return 0;
229 }
230 
231 /**
232  * Parse NAL units of found picture and decode some basic information.
233  *
234  * @param s parser context.
235  * @param avctx codec context.
236  * @param buf buffer with field/frame data.
237  * @param buf_size size of the buffer.
238  */
240  AVCodecContext *avctx,
241  const uint8_t * const buf, int buf_size)
242 {
243  H264ParseContext *p = s->priv_data;
244  H2645NAL nal = { NULL };
245  int buf_index, next_avc;
246  unsigned int pps_id;
247  unsigned int slice_type;
248  int state = -1, got_reset = 0;
249  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
250  int field_poc[2];
251  int ret;
252 
253  /* set some sane default values */
255  s->key_frame = 0;
257 
258  ff_h264_sei_uninit(&p->sei);
260 
261  if (!buf_size)
262  return 0;
263 
264  buf_index = 0;
265  next_avc = p->is_avc ? 0 : buf_size;
266  for (;;) {
267  const SPS *sps;
268  int src_length, consumed, nalsize = 0;
269 
270  if (buf_index >= next_avc) {
271  nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
272  if (nalsize < 0)
273  break;
274  next_avc = buf_index + nalsize;
275  } else {
276  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
277  if (buf_index >= buf_size)
278  break;
279  if (buf_index >= next_avc)
280  continue;
281  }
282  src_length = next_avc - buf_index;
283 
284  state = buf[buf_index];
285  switch (state & 0x1f) {
286  case H264_NAL_SLICE:
287  case H264_NAL_IDR_SLICE:
288  // Do not walk the whole buffer just to decode slice header
289  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
290  /* IDR or disposable slice
291  * No need to decode many bytes because MMCOs shall not be present. */
292  if (src_length > 60)
293  src_length = 60;
294  } else {
295  /* To decode up to MMCOs */
296  if (src_length > 1000)
297  src_length = 1000;
298  }
299  break;
300  }
301  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &nal, 1);
302  if (consumed < 0)
303  break;
304 
305  buf_index += consumed;
306 
307  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
308  if (ret < 0)
309  goto fail;
310  get_bits1(&nal.gb);
311  nal.ref_idc = get_bits(&nal.gb, 2);
312  nal.type = get_bits(&nal.gb, 5);
313 
314  switch (nal.type) {
315  case H264_NAL_SPS:
316  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
317  break;
318  case H264_NAL_PPS:
319  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
320  nal.size_bits);
321  break;
322  case H264_NAL_SEI:
323  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
324  break;
325  case H264_NAL_IDR_SLICE:
326  s->key_frame = 1;
327 
328  p->poc.prev_frame_num = 0;
329  p->poc.prev_frame_num_offset = 0;
330  p->poc.prev_poc_msb =
331  p->poc.prev_poc_lsb = 0;
332  /* fall through */
333  case H264_NAL_SLICE:
334  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
335  slice_type = get_ue_golomb_31(&nal.gb);
336  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
337  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
338  /* key frame, since recovery_frame_cnt is set */
339  s->key_frame = 1;
340  }
341  pps_id = get_ue_golomb(&nal.gb);
342  if (pps_id >= MAX_PPS_COUNT) {
343  av_log(avctx, AV_LOG_ERROR,
344  "pps_id %u out of range\n", pps_id);
345  goto fail;
346  }
347  if (!p->ps.pps_list[pps_id]) {
348  av_log(avctx, AV_LOG_ERROR,
349  "non-existing PPS %u referenced\n", pps_id);
350  goto fail;
351  }
352 
355  p->ps.pps = NULL;
356  p->ps.sps = NULL;
357  p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
358  if (!p->ps.pps_ref)
359  goto fail;
360  p->ps.pps = (const PPS*)p->ps.pps_ref->data;
361 
362  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
363  av_log(avctx, AV_LOG_ERROR,
364  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
365  goto fail;
366  }
367 
368  p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
369  if (!p->ps.sps_ref)
370  goto fail;
371  p->ps.sps = (const SPS*)p->ps.sps_ref->data;
372 
373  sps = p->ps.sps;
374 
375  // heuristic to detect non marked keyframes
376  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
377  s->key_frame = 1;
378 
379  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
380 
381  s->coded_width = 16 * sps->mb_width;
382  s->coded_height = 16 * sps->mb_height;
383  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
384  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
385  if (s->width <= 0 || s->height <= 0) {
386  s->width = s->coded_width;
387  s->height = s->coded_height;
388  }
389 
390  switch (sps->bit_depth_luma) {
391  case 9:
392  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
393  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
394  else s->format = AV_PIX_FMT_YUV420P9;
395  break;
396  case 10:
397  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
398  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
399  else s->format = AV_PIX_FMT_YUV420P10;
400  break;
401  case 8:
402  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
403  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
404  else s->format = AV_PIX_FMT_YUV420P;
405  break;
406  default:
407  s->format = AV_PIX_FMT_NONE;
408  }
409 
410  avctx->profile = ff_h264_get_profile(sps);
411  avctx->level = sps->level_idc;
412 
413  if (sps->frame_mbs_only_flag) {
415  } else {
416  if (get_bits1(&nal.gb)) { // field_pic_flag
417  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
418  } else {
420  }
421  }
422 
423  if (nal.type == H264_NAL_IDR_SLICE)
424  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
425  if (sps->poc_type == 0) {
426  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
427 
428  if (p->ps.pps->pic_order_present == 1 &&
431  }
432 
433  if (sps->poc_type == 1 &&
435  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
436 
437  if (p->ps.pps->pic_order_present == 1 &&
439  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
440  }
441 
442  /* Decode POC of this picture.
443  * The prev_ values needed for decoding POC of the next picture are not set here. */
444  field_poc[0] = field_poc[1] = INT_MAX;
445  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
446  &p->poc, p->picture_structure, nal.ref_idc);
447 
448  /* Continue parsing to check if MMCO_RESET is present.
449  * FIXME: MMCO_RESET could appear in non-first slice.
450  * Maybe, we should parse all undisposable non-IDR slice of this
451  * picture until encountering MMCO_RESET in a slice of it. */
452  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
453  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
454  if (got_reset < 0)
455  goto fail;
456  }
457 
458  /* Set up the prev_ values for decoding POC of the next picture. */
459  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
460  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
461  if (nal.ref_idc != 0) {
462  if (!got_reset) {
463  p->poc.prev_poc_msb = p->poc.poc_msb;
464  p->poc.prev_poc_lsb = p->poc.poc_lsb;
465  } else {
466  p->poc.prev_poc_msb = 0;
467  p->poc.prev_poc_lsb =
468  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
469  }
470  }
471 
472  if (sps->pic_struct_present_flag) {
473  switch (p->sei.picture_timing.pic_struct) {
476  s->repeat_pict = 0;
477  break;
481  s->repeat_pict = 1;
482  break;
485  s->repeat_pict = 2;
486  break;
488  s->repeat_pict = 3;
489  break;
491  s->repeat_pict = 5;
492  break;
493  default:
494  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
495  break;
496  }
497  } else {
498  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
499  }
500 
501  if (p->picture_structure == PICT_FRAME) {
503  if (sps->pic_struct_present_flag) {
504  switch (p->sei.picture_timing.pic_struct) {
508  break;
512  break;
513  default:
515  break;
516  }
517  } else {
518  if (field_poc[0] < field_poc[1])
520  else if (field_poc[0] > field_poc[1])
522  else
524  }
525  } else {
528  else
531  }
532 
533  av_freep(&nal.rbsp_buffer);
534  return 0; /* no need to evaluate the rest */
535  }
536  }
537  if (q264) {
538  av_freep(&nal.rbsp_buffer);
539  return 0;
540  }
541  /* didn't find a picture! */
542  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
543 fail:
544  av_freep(&nal.rbsp_buffer);
545  return -1;
546 }
547 
549  AVCodecContext *avctx,
550  const uint8_t **poutbuf, int *poutbuf_size,
551  const uint8_t *buf, int buf_size)
552 {
553  H264ParseContext *p = s->priv_data;
554  ParseContext *pc = &p->pc;
555  int next;
556 
557  if (!p->got_first) {
558  p->got_first = 1;
559  if (avctx->extradata_size) {
561  &p->ps, &p->is_avc, &p->nal_length_size,
562  avctx->err_recognition, avctx);
563  }
564  }
565 
567  next = buf_size;
568  } else {
569  next = h264_find_frame_end(p, buf, buf_size, avctx);
570 
571  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
572  *poutbuf = NULL;
573  *poutbuf_size = 0;
574  return buf_size;
575  }
576 
577  if (next < 0 && next != END_NOT_FOUND) {
578  av_assert1(pc->last_index + next >= 0);
579  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
580  }
581  }
582 
583  parse_nal_units(s, avctx, buf, buf_size);
584 
585  if (avctx->framerate.num)
586  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
587  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
588  s->dts_sync_point = p->sei.buffering_period.present;
589  s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
590  s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
591  } else {
592  s->dts_sync_point = INT_MIN;
593  s->dts_ref_dts_delta = INT_MIN;
594  s->pts_dts_delta = INT_MIN;
595  }
596 
597  if (s->flags & PARSER_FLAG_ONCE) {
598  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
599  }
600 
601  *poutbuf = buf;
602  *poutbuf_size = buf_size;
603  return next;
604 }
605 
606 static int h264_split(AVCodecContext *avctx,
607  const uint8_t *buf, int buf_size)
608 {
609  uint32_t state = -1;
610  int has_sps = 0;
611  int has_pps = 0;
612  const uint8_t *ptr = buf, *end = buf + buf_size;
613  int nalu_type;
614 
615  while (ptr < end) {
616  ptr = avpriv_find_start_code(ptr, end, &state);
617  if ((state & 0xFFFFFF00) != 0x100)
618  break;
619  nalu_type = state & 0x1F;
620  if (nalu_type == H264_NAL_SPS) {
621  has_sps = 1;
622  } else if (nalu_type == H264_NAL_PPS)
623  has_pps = 1;
624  /* else if (nalu_type == 0x01 ||
625  * nalu_type == 0x02 ||
626  * nalu_type == 0x05) {
627  * }
628  */
629  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
630  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
631  nalu_type != 0x0f) {
632  if (has_sps) {
633  while (ptr - 4 > buf && ptr[-5] == 0)
634  ptr--;
635  return ptr - 4 - buf;
636  }
637  }
638  }
639 
640  return 0;
641 }
642 
644 {
645  H264ParseContext *p = s->priv_data;
646  ParseContext *pc = &p->pc;
647 
648  av_freep(&pc->buffer);
649 
650  ff_h264_sei_uninit(&p->sei);
651  ff_h264_ps_uninit(&p->ps);
652 }
653 
655 {
656  H264ParseContext *p = s->priv_data;
657 
658  ff_h264dsp_init(&p->h264dsp, 8, 1);
659  return 0;
660 }
661 
664  .priv_data_size = sizeof(H264ParseContext),
665  .parser_init = init,
666  .parser_parse = h264_parse,
667  .parser_close = h264_close,
668  .split = h264_split,
669 };
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
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3358
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:124
int recovery_frame_cnt
recovery_frame_cnt
Definition: h264_sei.h:109
int size
Definition: h2645_parse.h:35
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:247
int weighted_bipred_idc
Definition: h264_ps.h:115
Memory handling functions.
AVBufferRef * sps_list[MAX_SPS_COUNT]
Definition: h264_ps.h:137
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:120
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5101
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:5078
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:113
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:254
int codec_ids[5]
Definition: avcodec.h:5122
Picture parameter set.
Definition: h264_ps.h:107
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5107
Convenience header that includes libavutil's core.
int frame_mbs_only_flag
Definition: h264_ps.h:60
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264dec.h:828
3: top field, bottom field, in that order
Definition: h264_sei.h:45
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:239
8: frame tripling
Definition: h264_sei.h:50
int profile
profile
Definition: avcodec.h:3164
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:1796
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264_ps.h:68
const PPS * pps
Definition: h264_ps.h:143
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5088
uint8_t
#define av_cold
Definition: attributes.h:82
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264_ps.h:66
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:67
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1774
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:422
#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:121
bitstream reader API header.
7: frame doubling
Definition: h264_sei.h:49
#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:141
#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:245
int ff_h264_get_profile(const SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264_parse.c:489
int weighted_pred
weighted_pred_flag
Definition: h264_ps.h:114
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:346
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:82
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: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
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:341
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:41
int ref_frame_count
num_ref_frames
Definition: h264_ps.h:56
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2947
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
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:116
int level
level
Definition: avcodec.h:3262
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 ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1805
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:65
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:342
int type
NAL unit type.
Definition: h2645_parse.h:52
2: bottom field
Definition: h264_sei.h:44
AVCodecParser ff_h264_parser
Definition: h264_parser.c:662
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:110
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:643
uint8_t * buffer
Definition: parser.h:29
Libavcodec external API header.
AVBufferRef * pps_list[MAX_PPS_COUNT]
Definition: h264_ps.h:138
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:437
SEI_PicStructType pic_struct
Definition: h264_sei.h:67
main external API structure.
Definition: avcodec.h:1659
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:1775
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:343
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:606
int index
Definition: gxfenc.c:89
5: top field, bottom field, top field repeated, in that order
Definition: h264_sei.h:47
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:406
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:340
const SPS * sps
Definition: h264_ps.h:144
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264_ps.h:108
H264SEIPictureTiming picture_timing
Definition: h264_sei.h:147
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:51
H264SEIRecoveryPoint recovery_point
Definition: h264_sei.h:151
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5096
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:344
int pic_struct_present_flag
Definition: h264_ps.h:90
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:4989
int mb_height
pic_height_in_map_units_minus1 + 1
Definition: h264_ps.h:59
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:282
AVBufferRef * pps_ref
Definition: h264_ps.h:140
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:49
H264SEIFramePacking frame_packing
Definition: h264_sei.h:153
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:92
Bi-dir predicted.
Definition: avutil.h:270
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4988
void ff_h264_ps_uninit(H264ParamSets *ps)
Uninit H264 param sets structure.
Definition: h264_ps.c:307
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:654
GetBitContext gb
Definition: h2645_parse.h:47
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264_ps.h:96
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:66
4: bottom field, top field, in that order
Definition: h264_sei.h:46
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:324
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5118
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:4972
1: top field
Definition: h264_sei.h:43
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:382
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:548
static struct @230 state
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264_ps.h:69
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:5003
int level_idc
Definition: h264_ps.h:46
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, void *logctx)
Definition: h264_parser.c:153
6: bottom field, top field, bottom field repeated, in that order
Definition: h264_sei.h:48
Predicted.
Definition: avutil.h:269
#define MAX_MMCO_COUNT
Definition: h264dec.h:54