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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, 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  H2645NAL nal = { NULL };
247  int buf_index, next_avc;
248  unsigned int pps_id;
249  unsigned int slice_type;
250  int state = -1, got_reset = 0;
251  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
252  int field_poc[2];
253  int ret;
254 
255  /* set some sane default values */
257  s->key_frame = 0;
259 
260  ff_h264_sei_uninit(&p->sei);
262 
263  if (!buf_size)
264  return 0;
265 
266  buf_index = 0;
267  next_avc = p->is_avc ? 0 : buf_size;
268  for (;;) {
269  const SPS *sps;
270  int src_length, consumed, nalsize = 0;
271 
272  if (buf_index >= next_avc) {
273  nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
274  if (nalsize < 0)
275  break;
276  next_avc = buf_index + nalsize;
277  } else {
278  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
279  if (buf_index >= buf_size)
280  break;
281  if (buf_index >= next_avc)
282  continue;
283  }
284  src_length = next_avc - buf_index;
285 
286  state = buf[buf_index];
287  switch (state & 0x1f) {
288  case H264_NAL_SLICE:
289  case H264_NAL_IDR_SLICE:
290  // Do not walk the whole buffer just to decode slice header
291  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
292  /* IDR or disposable slice
293  * No need to decode many bytes because MMCOs shall not be present. */
294  if (src_length > 60)
295  src_length = 60;
296  } else {
297  /* To decode up to MMCOs */
298  if (src_length > 1000)
299  src_length = 1000;
300  }
301  break;
302  }
303  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &nal, 1);
304  if (consumed < 0)
305  break;
306 
307  buf_index += consumed;
308 
309  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
310  if (ret < 0)
311  goto fail;
312  get_bits1(&nal.gb);
313  nal.ref_idc = get_bits(&nal.gb, 2);
314  nal.type = get_bits(&nal.gb, 5);
315 
316  switch (nal.type) {
317  case H264_NAL_SPS:
318  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
319  break;
320  case H264_NAL_PPS:
321  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
322  nal.size_bits);
323  break;
324  case H264_NAL_SEI:
325  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
326  break;
327  case H264_NAL_IDR_SLICE:
328  s->key_frame = 1;
329 
330  p->poc.prev_frame_num = 0;
331  p->poc.prev_frame_num_offset = 0;
332  p->poc.prev_poc_msb =
333  p->poc.prev_poc_lsb = 0;
334  /* fall through */
335  case H264_NAL_SLICE:
336  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
337  slice_type = get_ue_golomb_31(&nal.gb);
338  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
339  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
340  /* key frame, since recovery_frame_cnt is set */
341  s->key_frame = 1;
342  }
343  pps_id = get_ue_golomb(&nal.gb);
344  if (pps_id >= MAX_PPS_COUNT) {
345  av_log(avctx, AV_LOG_ERROR,
346  "pps_id %u out of range\n", pps_id);
347  goto fail;
348  }
349  if (!p->ps.pps_list[pps_id]) {
350  av_log(avctx, AV_LOG_ERROR,
351  "non-existing PPS %u referenced\n", pps_id);
352  goto fail;
353  }
354 
357  p->ps.pps = NULL;
358  p->ps.sps = NULL;
359  p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
360  if (!p->ps.pps_ref)
361  goto fail;
362  p->ps.pps = (const PPS*)p->ps.pps_ref->data;
363 
364  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
365  av_log(avctx, AV_LOG_ERROR,
366  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
367  goto fail;
368  }
369 
370  p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
371  if (!p->ps.sps_ref)
372  goto fail;
373  p->ps.sps = (const SPS*)p->ps.sps_ref->data;
374 
375  sps = p->ps.sps;
376 
377  // heuristic to detect non marked keyframes
378  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
379  s->key_frame = 1;
380 
381  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
382 
383  s->coded_width = 16 * sps->mb_width;
384  s->coded_height = 16 * sps->mb_height;
385  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
386  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
387  if (s->width <= 0 || s->height <= 0) {
388  s->width = s->coded_width;
389  s->height = s->coded_height;
390  }
391 
392  switch (sps->bit_depth_luma) {
393  case 9:
394  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
395  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
396  else s->format = AV_PIX_FMT_YUV420P9;
397  break;
398  case 10:
399  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
400  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
401  else s->format = AV_PIX_FMT_YUV420P10;
402  break;
403  case 8:
404  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
405  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
406  else s->format = AV_PIX_FMT_YUV420P;
407  break;
408  default:
409  s->format = AV_PIX_FMT_NONE;
410  }
411 
412  avctx->profile = ff_h264_get_profile(sps);
413  avctx->level = sps->level_idc;
414 
415  if (sps->frame_mbs_only_flag) {
417  } else {
418  if (get_bits1(&nal.gb)) { // field_pic_flag
419  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
420  } else {
422  }
423  }
424 
425  if (nal.type == H264_NAL_IDR_SLICE)
426  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
427  if (sps->poc_type == 0) {
428  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
429 
430  if (p->ps.pps->pic_order_present == 1 &&
433  }
434 
435  if (sps->poc_type == 1 &&
437  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
438 
439  if (p->ps.pps->pic_order_present == 1 &&
441  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
442  }
443 
444  /* Decode POC of this picture.
445  * The prev_ values needed for decoding POC of the next picture are not set here. */
446  field_poc[0] = field_poc[1] = INT_MAX;
447  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
448  &p->poc, p->picture_structure, nal.ref_idc);
449 
450  /* Continue parsing to check if MMCO_RESET is present.
451  * FIXME: MMCO_RESET could appear in non-first slice.
452  * Maybe, we should parse all undisposable non-IDR slice of this
453  * picture until encountering MMCO_RESET in a slice of it. */
454  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
455  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
456  if (got_reset < 0)
457  goto fail;
458  }
459 
460  /* Set up the prev_ values for decoding POC of the next picture. */
461  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
462  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
463  if (nal.ref_idc != 0) {
464  if (!got_reset) {
465  p->poc.prev_poc_msb = p->poc.poc_msb;
466  p->poc.prev_poc_lsb = p->poc.poc_lsb;
467  } else {
468  p->poc.prev_poc_msb = 0;
469  p->poc.prev_poc_lsb =
470  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
471  }
472  }
473 
474  if (sps->pic_struct_present_flag) {
475  switch (p->sei.picture_timing.pic_struct) {
478  s->repeat_pict = 0;
479  break;
483  s->repeat_pict = 1;
484  break;
487  s->repeat_pict = 2;
488  break;
490  s->repeat_pict = 3;
491  break;
493  s->repeat_pict = 5;
494  break;
495  default:
496  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
497  break;
498  }
499  } else {
500  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
501  }
502 
503  if (p->picture_structure == PICT_FRAME) {
505  if (sps->pic_struct_present_flag) {
506  switch (p->sei.picture_timing.pic_struct) {
510  break;
514  break;
515  default:
517  break;
518  }
519  } else {
520  if (field_poc[0] < field_poc[1])
522  else if (field_poc[0] > field_poc[1])
524  else
526  }
527  } else {
530  else
532  if (p->poc.frame_num == p->last_frame_num &&
538  else
540  } else {
542  }
544  p->last_frame_num = p->poc.frame_num;
545  }
546 
547  av_freep(&nal.rbsp_buffer);
548  return 0; /* no need to evaluate the rest */
549  }
550  }
551  if (q264) {
552  av_freep(&nal.rbsp_buffer);
553  return 0;
554  }
555  /* didn't find a picture! */
556  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
557 fail:
558  av_freep(&nal.rbsp_buffer);
559  return -1;
560 }
561 
563  AVCodecContext *avctx,
564  const uint8_t **poutbuf, int *poutbuf_size,
565  const uint8_t *buf, int buf_size)
566 {
567  H264ParseContext *p = s->priv_data;
568  ParseContext *pc = &p->pc;
569  int next;
570 
571  if (!p->got_first) {
572  p->got_first = 1;
573  if (avctx->extradata_size) {
575  &p->ps, &p->is_avc, &p->nal_length_size,
576  avctx->err_recognition, avctx);
577  }
578  }
579 
581  next = buf_size;
582  } else {
583  next = h264_find_frame_end(p, buf, buf_size, avctx);
584 
585  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
586  *poutbuf = NULL;
587  *poutbuf_size = 0;
588  return buf_size;
589  }
590 
591  if (next < 0 && next != END_NOT_FOUND) {
592  av_assert1(pc->last_index + next >= 0);
593  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
594  }
595  }
596 
597  parse_nal_units(s, avctx, buf, buf_size);
598 
599  if (avctx->framerate.num)
600  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
601  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
602  s->dts_sync_point = p->sei.buffering_period.present;
603  s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
604  s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
605  } else {
606  s->dts_sync_point = INT_MIN;
607  s->dts_ref_dts_delta = INT_MIN;
608  s->pts_dts_delta = INT_MIN;
609  }
610 
611  if (s->flags & PARSER_FLAG_ONCE) {
612  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
613  }
614 
615  if (s->dts_sync_point >= 0) {
616  int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
617  if (den > 0) {
618  int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
619  if (s->dts != AV_NOPTS_VALUE) {
620  // got DTS from the stream, update reference timestamp
621  p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
622  } else if (p->reference_dts != AV_NOPTS_VALUE) {
623  // compute DTS based on reference timestamp
624  s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
625  }
626 
627  if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
628  s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
629 
630  if (s->dts_sync_point > 0)
631  p->reference_dts = s->dts; // new reference
632  }
633  }
634 
635  *poutbuf = buf;
636  *poutbuf_size = buf_size;
637  return next;
638 }
639 
640 static int h264_split(AVCodecContext *avctx,
641  const uint8_t *buf, int buf_size)
642 {
643  uint32_t state = -1;
644  int has_sps = 0;
645  int has_pps = 0;
646  const uint8_t *ptr = buf, *end = buf + buf_size;
647  int nalu_type;
648 
649  while (ptr < end) {
650  ptr = avpriv_find_start_code(ptr, end, &state);
651  if ((state & 0xFFFFFF00) != 0x100)
652  break;
653  nalu_type = state & 0x1F;
654  if (nalu_type == H264_NAL_SPS) {
655  has_sps = 1;
656  } else if (nalu_type == H264_NAL_PPS)
657  has_pps = 1;
658  /* else if (nalu_type == 0x01 ||
659  * nalu_type == 0x02 ||
660  * nalu_type == 0x05) {
661  * }
662  */
663  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
664  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
665  nalu_type != 0x0f) {
666  if (has_sps) {
667  while (ptr - 4 > buf && ptr[-5] == 0)
668  ptr--;
669  return ptr - 4 - buf;
670  }
671  }
672  }
673 
674  return 0;
675 }
676 
678 {
679  H264ParseContext *p = s->priv_data;
680  ParseContext *pc = &p->pc;
681 
682  av_freep(&pc->buffer);
683 
684  ff_h264_sei_uninit(&p->sei);
685  ff_h264_ps_uninit(&p->ps);
686 }
687 
689 {
690  H264ParseContext *p = s->priv_data;
691 
693  p->last_frame_num = INT_MAX;
694  ff_h264dsp_init(&p->h264dsp, 8, 1);
695  return 0;
696 }
697 
700  .priv_data_size = sizeof(H264ParseContext),
701  .parser_init = init,
702  .parser_parse = h264_parse,
703  .parser_close = h264_close,
704  .split = h264_split,
705 };
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:720
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3376
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: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 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:5129
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:5106
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:254
int codec_ids[5]
Definition: avcodec.h:5150
Picture parameter set.
Definition: h264_ps.h:108
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5135
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: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:241
8: frame tripling
Definition: h264_sei.h:50
int profile
profile
Definition: avcodec.h:3182
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:1813
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:5116
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:1791
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:122
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: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:250
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:115
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:354
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:84
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:349
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
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2965
#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:3280
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:1822
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:65
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:350
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:698
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:677
uint8_t * buffer
Definition: parser.h:29
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:441
SEI_PicStructType pic_struct
Definition: h264_sei.h:67
main external API structure.
Definition: avcodec.h:1676
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
static struct @246 state
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:1792
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:351
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:640
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:410
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:348
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: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:5124
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:352
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:5017
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:282
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: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:5016
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:688
GetBitContext gb
Definition: h2645_parse.h:47
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
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:5146
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:5000
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:562
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 key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:5031
int level_idc
Definition: h264_ps.h:46
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:48
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242
Predicted.
Definition: avutil.h:269
#define MAX_MMCO_COUNT
Definition: h264dec.h:54