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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;
65 
66 
68  int buf_size, void *logctx)
69 {
70  int i, j;
71  uint32_t state;
72  ParseContext *pc = &p->pc;
73 
74  int next_avc = p->is_avc ? 0 : buf_size;
75 // mb_addr= pc->mb_addr - 1;
76  state = pc->state;
77  if (state > 13)
78  state = 7;
79 
80  if (p->is_avc && !p->nal_length_size)
81  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
82 
83  for (i = 0; i < buf_size; i++) {
84  if (i >= next_avc) {
85  int nalsize = 0;
86  i = next_avc;
87  for (j = 0; j < p->nal_length_size; j++)
88  nalsize = (nalsize << 8) | buf[i++];
89  if (nalsize <= 0 || nalsize > buf_size - i) {
90  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
91  return buf_size;
92  }
93  next_avc = i + nalsize;
94  state = 5;
95  }
96 
97  if (state == 7) {
98  i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
99  if (i < next_avc)
100  state = 2;
101  } else if (state <= 2) {
102  if (buf[i] == 1)
103  state ^= 5; // 2->7, 1->4, 0->5
104  else if (buf[i])
105  state = 7;
106  else
107  state >>= 1; // 2->1, 1->0, 0->0
108  } else if (state <= 5) {
109  int nalu_type = buf[i] & 0x1F;
110  if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
111  nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
112  if (pc->frame_start_found) {
113  i++;
114  goto found;
115  }
116  } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
117  nalu_type == H264_NAL_IDR_SLICE) {
118  state += 8;
119  continue;
120  }
121  state = 7;
122  } else {
123  p->parse_history[p->parse_history_count++] = buf[i];
124  if (p->parse_history_count > 5) {
125  unsigned int mb, last_mb = p->parse_last_mb;
126  GetBitContext gb;
127 
129  p->parse_history_count = 0;
130  mb= get_ue_golomb_long(&gb);
131  p->parse_last_mb = mb;
132  if (pc->frame_start_found) {
133  if (mb <= last_mb)
134  goto found;
135  } else
136  pc->frame_start_found = 1;
137  state = 7;
138  }
139  }
140  }
141  pc->state = state;
142  if (p->is_avc)
143  return next_avc;
144  return END_NOT_FOUND;
145 
146 found:
147  pc->state = 7;
148  pc->frame_start_found = 0;
149  if (p->is_avc)
150  return next_avc;
151  return i - (state & 5) - 5 * (state > 7);
152 }
153 
155  void *logctx)
156 {
158  int slice_type_nos = s->pict_type & 3;
159  H264ParseContext *p = s->priv_data;
160  int list_count, ref_count[2];
161 
162 
164  get_ue_golomb(gb); // redundant_pic_count
165 
166  if (slice_type_nos == AV_PICTURE_TYPE_B)
167  get_bits1(gb); // direct_spatial_mv_pred
168 
169  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
170  slice_type_nos, p->picture_structure, logctx) < 0)
171  return AVERROR_INVALIDDATA;
172 
173  if (slice_type_nos != AV_PICTURE_TYPE_I) {
174  int list;
175  for (list = 0; list < list_count; list++) {
176  if (get_bits1(gb)) {
177  int index;
178  for (index = 0; ; index++) {
179  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
180 
181  if (reordering_of_pic_nums_idc < 3)
182  get_ue_golomb_long(gb);
183  else if (reordering_of_pic_nums_idc > 3) {
184  av_log(logctx, AV_LOG_ERROR,
185  "illegal reordering_of_pic_nums_idc %d\n",
186  reordering_of_pic_nums_idc);
187  return AVERROR_INVALIDDATA;
188  } else
189  break;
190 
191  if (index >= ref_count[list]) {
192  av_log(logctx, AV_LOG_ERROR,
193  "reference count %d overflow\n", index);
194  return AVERROR_INVALIDDATA;
195  }
196  }
197  }
198  }
199  }
200 
201  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
202  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
203  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
204  &pwt, logctx);
205 
206  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
207  int i;
208  for (i = 0; i < MAX_MMCO_COUNT; i++) {
209  MMCOOpcode opcode = get_ue_golomb_31(gb);
210  if (opcode > (unsigned) MMCO_LONG) {
211  av_log(logctx, AV_LOG_ERROR,
212  "illegal memory management control operation %d\n",
213  opcode);
214  return AVERROR_INVALIDDATA;
215  }
216  if (opcode == MMCO_END)
217  return 0;
218  else if (opcode == MMCO_RESET)
219  return 1;
220 
221  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
222  get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
223  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
224  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
225  get_ue_golomb_31(gb);
226  }
227  }
228 
229  return 0;
230 }
231 
232 /**
233  * Parse NAL units of found picture and decode some basic information.
234  *
235  * @param s parser context.
236  * @param avctx codec context.
237  * @param buf buffer with field/frame data.
238  * @param buf_size size of the buffer.
239  */
241  AVCodecContext *avctx,
242  const uint8_t * const buf, int buf_size)
243 {
244  H264ParseContext *p = s->priv_data;
245  H2645NAL nal = { NULL };
246  int buf_index, next_avc;
247  unsigned int pps_id;
248  unsigned int slice_type;
249  int state = -1, got_reset = 0;
250  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
251  int field_poc[2];
252  int ret;
253 
254  /* set some sane default values */
256  s->key_frame = 0;
258 
259  ff_h264_sei_uninit(&p->sei);
261 
262  if (!buf_size)
263  return 0;
264 
265  buf_index = 0;
266  next_avc = p->is_avc ? 0 : buf_size;
267  for (;;) {
268  const SPS *sps;
269  int src_length, consumed, nalsize = 0;
270 
271  if (buf_index >= next_avc) {
272  nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
273  if (nalsize < 0)
274  break;
275  next_avc = buf_index + nalsize;
276  } else {
277  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
278  if (buf_index >= buf_size)
279  break;
280  if (buf_index >= next_avc)
281  continue;
282  }
283  src_length = next_avc - buf_index;
284 
285  state = buf[buf_index];
286  switch (state & 0x1f) {
287  case H264_NAL_SLICE:
288  case H264_NAL_IDR_SLICE:
289  // Do not walk the whole buffer just to decode slice header
290  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
291  /* IDR or disposable slice
292  * No need to decode many bytes because MMCOs shall not be present. */
293  if (src_length > 60)
294  src_length = 60;
295  } else {
296  /* To decode up to MMCOs */
297  if (src_length > 1000)
298  src_length = 1000;
299  }
300  break;
301  }
302  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &nal, 1);
303  if (consumed < 0)
304  break;
305 
306  buf_index += consumed;
307 
308  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
309  if (ret < 0)
310  goto fail;
311  get_bits1(&nal.gb);
312  nal.ref_idc = get_bits(&nal.gb, 2);
313  nal.type = get_bits(&nal.gb, 5);
314 
315  switch (nal.type) {
316  case H264_NAL_SPS:
317  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
318  break;
319  case H264_NAL_PPS:
320  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
321  nal.size_bits);
322  break;
323  case H264_NAL_SEI:
324  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
325  break;
326  case H264_NAL_IDR_SLICE:
327  s->key_frame = 1;
328 
329  p->poc.prev_frame_num = 0;
330  p->poc.prev_frame_num_offset = 0;
331  p->poc.prev_poc_msb =
332  p->poc.prev_poc_lsb = 0;
333  /* fall through */
334  case H264_NAL_SLICE:
335  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
336  slice_type = get_ue_golomb_31(&nal.gb);
337  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
338  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
339  /* key frame, since recovery_frame_cnt is set */
340  s->key_frame = 1;
341  }
342  pps_id = get_ue_golomb(&nal.gb);
343  if (pps_id >= MAX_PPS_COUNT) {
344  av_log(avctx, AV_LOG_ERROR,
345  "pps_id %u out of range\n", pps_id);
346  goto fail;
347  }
348  if (!p->ps.pps_list[pps_id]) {
349  av_log(avctx, AV_LOG_ERROR,
350  "non-existing PPS %u referenced\n", pps_id);
351  goto fail;
352  }
353 
356  p->ps.pps = NULL;
357  p->ps.sps = NULL;
358  p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
359  if (!p->ps.pps_ref)
360  goto fail;
361  p->ps.pps = (const PPS*)p->ps.pps_ref->data;
362 
363  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
364  av_log(avctx, AV_LOG_ERROR,
365  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
366  goto fail;
367  }
368 
369  p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
370  if (!p->ps.sps_ref)
371  goto fail;
372  p->ps.sps = (const SPS*)p->ps.sps_ref->data;
373 
374  sps = p->ps.sps;
375 
376  // heuristic to detect non marked keyframes
377  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
378  s->key_frame = 1;
379 
380  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
381 
382  s->coded_width = 16 * sps->mb_width;
383  s->coded_height = 16 * sps->mb_height;
384  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
385  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
386  if (s->width <= 0 || s->height <= 0) {
387  s->width = s->coded_width;
388  s->height = s->coded_height;
389  }
390 
391  switch (sps->bit_depth_luma) {
392  case 9:
393  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
394  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
395  else s->format = AV_PIX_FMT_YUV420P9;
396  break;
397  case 10:
398  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
399  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
400  else s->format = AV_PIX_FMT_YUV420P10;
401  break;
402  case 8:
403  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
404  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
405  else s->format = AV_PIX_FMT_YUV420P;
406  break;
407  default:
408  s->format = AV_PIX_FMT_NONE;
409  }
410 
411  avctx->profile = ff_h264_get_profile(sps);
412  avctx->level = sps->level_idc;
413 
414  if (sps->frame_mbs_only_flag) {
416  } else {
417  if (get_bits1(&nal.gb)) { // field_pic_flag
418  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
419  } else {
421  }
422  }
423 
424  if (nal.type == H264_NAL_IDR_SLICE)
425  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
426  if (sps->poc_type == 0) {
427  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
428 
429  if (p->ps.pps->pic_order_present == 1 &&
432  }
433 
434  if (sps->poc_type == 1 &&
436  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
437 
438  if (p->ps.pps->pic_order_present == 1 &&
440  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
441  }
442 
443  /* Decode POC of this picture.
444  * The prev_ values needed for decoding POC of the next picture are not set here. */
445  field_poc[0] = field_poc[1] = INT_MAX;
446  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
447  &p->poc, p->picture_structure, nal.ref_idc);
448 
449  /* Continue parsing to check if MMCO_RESET is present.
450  * FIXME: MMCO_RESET could appear in non-first slice.
451  * Maybe, we should parse all undisposable non-IDR slice of this
452  * picture until encountering MMCO_RESET in a slice of it. */
453  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
454  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
455  if (got_reset < 0)
456  goto fail;
457  }
458 
459  /* Set up the prev_ values for decoding POC of the next picture. */
460  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
461  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
462  if (nal.ref_idc != 0) {
463  if (!got_reset) {
464  p->poc.prev_poc_msb = p->poc.poc_msb;
465  p->poc.prev_poc_lsb = p->poc.poc_lsb;
466  } else {
467  p->poc.prev_poc_msb = 0;
468  p->poc.prev_poc_lsb =
469  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
470  }
471  }
472 
473  if (sps->pic_struct_present_flag) {
474  switch (p->sei.picture_timing.pic_struct) {
477  s->repeat_pict = 0;
478  break;
482  s->repeat_pict = 1;
483  break;
486  s->repeat_pict = 2;
487  break;
489  s->repeat_pict = 3;
490  break;
492  s->repeat_pict = 5;
493  break;
494  default:
495  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
496  break;
497  }
498  } else {
499  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
500  }
501 
502  if (p->picture_structure == PICT_FRAME) {
504  if (sps->pic_struct_present_flag) {
505  switch (p->sei.picture_timing.pic_struct) {
509  break;
513  break;
514  default:
516  break;
517  }
518  } else {
519  if (field_poc[0] < field_poc[1])
521  else if (field_poc[0] > field_poc[1])
523  else
525  }
526  } else {
529  else
532  }
533 
534  av_freep(&nal.rbsp_buffer);
535  return 0; /* no need to evaluate the rest */
536  }
537  }
538  if (q264) {
539  av_freep(&nal.rbsp_buffer);
540  return 0;
541  }
542  /* didn't find a picture! */
543  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
544 fail:
545  av_freep(&nal.rbsp_buffer);
546  return -1;
547 }
548 
550  AVCodecContext *avctx,
551  const uint8_t **poutbuf, int *poutbuf_size,
552  const uint8_t *buf, int buf_size)
553 {
554  H264ParseContext *p = s->priv_data;
555  ParseContext *pc = &p->pc;
556  int next;
557 
558  if (!p->got_first) {
559  p->got_first = 1;
560  if (avctx->extradata_size) {
562  &p->ps, &p->is_avc, &p->nal_length_size,
563  avctx->err_recognition, avctx);
564  }
565  }
566 
568  next = buf_size;
569  } else {
570  next = h264_find_frame_end(p, buf, buf_size, avctx);
571 
572  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
573  *poutbuf = NULL;
574  *poutbuf_size = 0;
575  return buf_size;
576  }
577 
578  if (next < 0 && next != END_NOT_FOUND) {
579  av_assert1(pc->last_index + next >= 0);
580  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
581  }
582  }
583 
584  parse_nal_units(s, avctx, buf, buf_size);
585 
586  if (avctx->framerate.num)
587  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
588  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
589  s->dts_sync_point = p->sei.buffering_period.present;
590  s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
591  s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
592  } else {
593  s->dts_sync_point = INT_MIN;
594  s->dts_ref_dts_delta = INT_MIN;
595  s->pts_dts_delta = INT_MIN;
596  }
597 
598  if (s->flags & PARSER_FLAG_ONCE) {
599  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
600  }
601 
602  if (s->dts_sync_point >= 0) {
603  int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
604  if (den > 0) {
605  int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
606  if (s->dts != AV_NOPTS_VALUE) {
607  // got DTS from the stream, update reference timestamp
608  p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
609  } else if (p->reference_dts != AV_NOPTS_VALUE) {
610  // compute DTS based on reference timestamp
611  s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
612  }
613 
614  if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
615  s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
616 
617  if (s->dts_sync_point > 0)
618  p->reference_dts = s->dts; // new reference
619  }
620  }
621 
622  *poutbuf = buf;
623  *poutbuf_size = buf_size;
624  return next;
625 }
626 
627 static int h264_split(AVCodecContext *avctx,
628  const uint8_t *buf, int buf_size)
629 {
630  uint32_t state = -1;
631  int has_sps = 0;
632  int has_pps = 0;
633  const uint8_t *ptr = buf, *end = buf + buf_size;
634  int nalu_type;
635 
636  while (ptr < end) {
637  ptr = avpriv_find_start_code(ptr, end, &state);
638  if ((state & 0xFFFFFF00) != 0x100)
639  break;
640  nalu_type = state & 0x1F;
641  if (nalu_type == H264_NAL_SPS) {
642  has_sps = 1;
643  } else if (nalu_type == H264_NAL_PPS)
644  has_pps = 1;
645  /* else if (nalu_type == 0x01 ||
646  * nalu_type == 0x02 ||
647  * nalu_type == 0x05) {
648  * }
649  */
650  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
651  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
652  nalu_type != 0x0f) {
653  if (has_sps) {
654  while (ptr - 4 > buf && ptr[-5] == 0)
655  ptr--;
656  return ptr - 4 - buf;
657  }
658  }
659  }
660 
661  return 0;
662 }
663 
665 {
666  H264ParseContext *p = s->priv_data;
667  ParseContext *pc = &p->pc;
668 
669  av_freep(&pc->buffer);
670 
671  ff_h264_sei_uninit(&p->sei);
672  ff_h264_ps_uninit(&p->ps);
673 }
674 
676 {
677  H264ParseContext *p = s->priv_data;
678 
680  ff_h264dsp_init(&p->h264dsp, 8, 1);
681  return 0;
682 }
683 
686  .priv_data_size = sizeof(H264ParseContext),
687  .parser_init = init,
688  .parser_parse = h264_parse,
689  .parser_close = h264_close,
690  .split = h264_split,
691 };
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:3374
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:5117
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:5094
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:5138
Picture parameter set.
Definition: h264_ps.h:107
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5123
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:240
8: frame tripling
Definition: h264_sei.h:50
int profile
profile
Definition: avcodec.h:3180
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:1812
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:5104
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:1790
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: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:2963
#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:3278
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:1821
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:684
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:664
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:1675
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:1791
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:627
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
static struct @244 state
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5112
#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:5005
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:5004
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:675
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:67
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:5134
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:4988
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:549
int64_t reference_dts
Definition: h264_parser.c:63
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:5019
int level_idc
Definition: h264_ps.h:46
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, void *logctx)
Definition: h264_parser.c:154
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