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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 "get_bits.h"
40 #include "golomb.h"
41 #include "h264.h"
42 #include "h264_sei.h"
43 #include "h264data.h"
44 #include "internal.h"
45 #include "mpegutils.h"
46 #include "parser.h"
47 
48 typedef struct H264ParseContext {
54  int is_avc;
56  int got_first;
62 
63 
65  int buf_size, void *logctx)
66 {
67  int i, j;
68  uint32_t state;
69  ParseContext *pc = &p->pc;
70 
71  int next_avc = p->is_avc ? 0 : buf_size;
72 // mb_addr= pc->mb_addr - 1;
73  state = pc->state;
74  if (state > 13)
75  state = 7;
76 
77  if (p->is_avc && !p->nal_length_size)
78  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
79 
80  for (i = 0; i < buf_size; i++) {
81  if (i >= next_avc) {
82  int nalsize = 0;
83  i = next_avc;
84  for (j = 0; j < p->nal_length_size; j++)
85  nalsize = (nalsize << 8) | buf[i++];
86  if (nalsize <= 0 || nalsize > buf_size - i) {
87  av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
88  return buf_size;
89  }
90  next_avc = i + nalsize;
91  state = 5;
92  }
93 
94  if (state == 7) {
95  i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
96  if (i < next_avc)
97  state = 2;
98  } else if (state <= 2) {
99  if (buf[i] == 1)
100  state ^= 5; // 2->7, 1->4, 0->5
101  else if (buf[i])
102  state = 7;
103  else
104  state >>= 1; // 2->1, 1->0, 0->0
105  } else if (state <= 5) {
106  int nalu_type = buf[i] & 0x1F;
107  if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
108  nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
109  if (pc->frame_start_found) {
110  i++;
111  goto found;
112  }
113  } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
114  nalu_type == NAL_IDR_SLICE) {
115  state += 8;
116  continue;
117  }
118  state = 7;
119  } else {
120  p->parse_history[p->parse_history_count++] = buf[i];
121  if (p->parse_history_count > 5) {
122  unsigned int mb, last_mb = p->parse_last_mb;
123  GetBitContext gb;
124 
126  p->parse_history_count = 0;
127  mb= get_ue_golomb_long(&gb);
128  p->parse_last_mb = mb;
129  if (pc->frame_start_found) {
130  if (mb <= last_mb)
131  goto found;
132  } else
133  pc->frame_start_found = 1;
134  state = 7;
135  }
136  }
137  }
138  pc->state = state;
139  if (p->is_avc)
140  return next_avc;
141  return END_NOT_FOUND;
142 
143 found:
144  pc->state = 7;
145  pc->frame_start_found = 0;
146  if (p->is_avc)
147  return next_avc;
148  return i - (state & 5) - 5 * (state > 7);
149 }
150 
152  void *logctx)
153 {
155  int slice_type_nos = s->pict_type & 3;
156  H264ParseContext *p = s->priv_data;
157  int list_count, ref_count[2];
158 
159 
161  get_ue_golomb(gb); // redundant_pic_count
162 
163  if (slice_type_nos == AV_PICTURE_TYPE_B)
164  get_bits1(gb); // direct_spatial_mv_pred
165 
166  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
167  slice_type_nos, p->picture_structure, logctx) < 0)
168  return AVERROR_INVALIDDATA;
169 
170  if (slice_type_nos != AV_PICTURE_TYPE_I) {
171  int list;
172  for (list = 0; list < list_count; list++) {
173  if (get_bits1(gb)) {
174  int index;
175  for (index = 0; ; index++) {
176  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
177 
178  if (reordering_of_pic_nums_idc < 3)
179  get_ue_golomb_long(gb);
180  else if (reordering_of_pic_nums_idc > 3) {
181  av_log(logctx, AV_LOG_ERROR,
182  "illegal reordering_of_pic_nums_idc %d\n",
183  reordering_of_pic_nums_idc);
184  return AVERROR_INVALIDDATA;
185  } else
186  break;
187 
188  if (index >= ref_count[list]) {
189  av_log(logctx, AV_LOG_ERROR,
190  "reference count %d overflow\n", index);
191  return AVERROR_INVALIDDATA;
192  }
193  }
194  }
195  }
196  }
197 
198  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
199  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
200  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
201  &pwt, logctx);
202 
203  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
204  int i;
205  for (i = 0; i < MAX_MMCO_COUNT; i++) {
206  MMCOOpcode opcode = get_ue_golomb_31(gb);
207  if (opcode > (unsigned) MMCO_LONG) {
208  av_log(logctx, AV_LOG_ERROR,
209  "illegal memory management control operation %d\n",
210  opcode);
211  return AVERROR_INVALIDDATA;
212  }
213  if (opcode == MMCO_END)
214  return 0;
215  else if (opcode == MMCO_RESET)
216  return 1;
217 
218  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
219  get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
220  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
221  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
222  get_ue_golomb_31(gb);
223  }
224  }
225 
226  return 0;
227 }
228 
229 static inline int get_avc_nalsize(H264ParseContext *p, const uint8_t *buf,
230  int buf_size, int *buf_index, void *logctx)
231 {
232  int i, nalsize = 0;
233 
234  if (*buf_index >= buf_size - p->nal_length_size) {
235  // the end of the buffer is reached, refill it
236  return AVERROR(EAGAIN);
237  }
238 
239  for (i = 0; i < p->nal_length_size; i++)
240  nalsize = ((unsigned)nalsize << 8) | buf[(*buf_index)++];
241  if (nalsize <= 0 || nalsize > buf_size - *buf_index) {
242  av_log(logctx, AV_LOG_ERROR,
243  "AVC: nal size %d\n", nalsize);
244  return AVERROR_INVALIDDATA;
245  }
246  return nalsize;
247 }
248 
249 /**
250  * Parse NAL units of found picture and decode some basic information.
251  *
252  * @param s parser context.
253  * @param avctx codec context.
254  * @param buf buffer with field/frame data.
255  * @param buf_size size of the buffer.
256  */
258  AVCodecContext *avctx,
259  const uint8_t * const buf, int buf_size)
260 {
261  H264ParseContext *p = s->priv_data;
262  H2645NAL nal = { NULL };
263  int buf_index, next_avc;
264  unsigned int pps_id;
265  unsigned int slice_type;
266  int state = -1, got_reset = 0;
267  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
268  int field_poc[2];
269  int ret;
270 
271  /* set some sane default values */
273  s->key_frame = 0;
275 
276  ff_h264_sei_uninit(&p->sei);
278 
279  if (!buf_size)
280  return 0;
281 
282  buf_index = 0;
283  next_avc = p->is_avc ? 0 : buf_size;
284  for (;;) {
285  const SPS *sps;
286  int src_length, consumed, nalsize = 0;
287 
288  if (buf_index >= next_avc) {
289  nalsize = get_avc_nalsize(p, buf, buf_size, &buf_index, avctx);
290  if (nalsize < 0)
291  break;
292  next_avc = buf_index + nalsize;
293  } else {
294  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
295  if (buf_index >= buf_size)
296  break;
297  if (buf_index >= next_avc)
298  continue;
299  }
300  src_length = next_avc - buf_index;
301 
302  state = buf[buf_index];
303  switch (state & 0x1f) {
304  case NAL_SLICE:
305  case NAL_IDR_SLICE:
306  // Do not walk the whole buffer just to decode slice header
307  if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
308  /* IDR or disposable slice
309  * No need to decode many bytes because MMCOs shall not be present. */
310  if (src_length > 60)
311  src_length = 60;
312  } else {
313  /* To decode up to MMCOs */
314  if (src_length > 1000)
315  src_length = 1000;
316  }
317  break;
318  }
319  consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &nal);
320  if (consumed < 0)
321  break;
322 
323  buf_index += consumed;
324 
325  ret = init_get_bits8(&nal.gb, nal.data, nal.size);
326  if (ret < 0)
327  goto fail;
328  get_bits1(&nal.gb);
329  nal.ref_idc = get_bits(&nal.gb, 2);
330  nal.type = get_bits(&nal.gb, 5);
331 
332  switch (nal.type) {
333  case NAL_SPS:
334  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
335  break;
336  case NAL_PPS:
337  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
338  nal.size_bits);
339  break;
340  case NAL_SEI:
341  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
342  break;
343  case NAL_IDR_SLICE:
344  s->key_frame = 1;
345 
346  p->poc.prev_frame_num = 0;
347  p->poc.prev_frame_num_offset = 0;
348  p->poc.prev_poc_msb =
349  p->poc.prev_poc_lsb = 0;
350  /* fall through */
351  case NAL_SLICE:
352  get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
353  slice_type = get_ue_golomb_31(&nal.gb);
354  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
355  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
356  /* key frame, since recovery_frame_cnt is set */
357  s->key_frame = 1;
358  }
359  pps_id = get_ue_golomb(&nal.gb);
360  if (pps_id >= MAX_PPS_COUNT) {
361  av_log(avctx, AV_LOG_ERROR,
362  "pps_id %u out of range\n", pps_id);
363  goto fail;
364  }
365  if (!p->ps.pps_list[pps_id]) {
366  av_log(avctx, AV_LOG_ERROR,
367  "non-existing PPS %u referenced\n", pps_id);
368  goto fail;
369  }
370  p->ps.pps = (const PPS*)p->ps.pps_list[pps_id]->data;
371  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
372  av_log(avctx, AV_LOG_ERROR,
373  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
374  goto fail;
375  }
376  p->ps.sps = (SPS*)p->ps.sps_list[p->ps.pps->sps_id]->data;
377 
378  sps = p->ps.sps;
379 
380  // heuristic to detect non marked keyframes
381  if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
382  s->key_frame = 1;
383 
384  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
385 
386  s->coded_width = 16 * sps->mb_width;
387  s->coded_height = 16 * sps->mb_height;
388  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
389  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
390  if (s->width <= 0 || s->height <= 0) {
391  s->width = s->coded_width;
392  s->height = s->coded_height;
393  }
394 
395  switch (sps->bit_depth_luma) {
396  case 9:
397  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
398  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
399  else s->format = AV_PIX_FMT_YUV420P9;
400  break;
401  case 10:
402  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
403  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
404  else s->format = AV_PIX_FMT_YUV420P10;
405  break;
406  case 8:
407  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
408  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
409  else s->format = AV_PIX_FMT_YUV420P;
410  break;
411  default:
412  s->format = AV_PIX_FMT_NONE;
413  }
414 
415  avctx->profile = ff_h264_get_profile(sps);
416  avctx->level = sps->level_idc;
417 
418  if (sps->frame_mbs_only_flag) {
420  } else {
421  if (get_bits1(&nal.gb)) { // field_pic_flag
422  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
423  } else {
425  }
426  }
427 
428  if (nal.type == NAL_IDR_SLICE)
429  get_ue_golomb_long(&nal.gb); /* idr_pic_id */
430  if (sps->poc_type == 0) {
431  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
432 
433  if (p->ps.pps->pic_order_present == 1 &&
436  }
437 
438  if (sps->poc_type == 1 &&
440  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
441 
442  if (p->ps.pps->pic_order_present == 1 &&
444  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
445  }
446 
447  /* Decode POC of this picture.
448  * The prev_ values needed for decoding POC of the next picture are not set here. */
449  field_poc[0] = field_poc[1] = INT_MAX;
450  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
451  &p->poc, p->picture_structure, nal.ref_idc);
452 
453  /* Continue parsing to check if MMCO_RESET is present.
454  * FIXME: MMCO_RESET could appear in non-first slice.
455  * Maybe, we should parse all undisposable non-IDR slice of this
456  * picture until encountering MMCO_RESET in a slice of it. */
457  if (nal.ref_idc && nal.type != NAL_IDR_SLICE) {
458  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
459  if (got_reset < 0)
460  goto fail;
461  }
462 
463  /* Set up the prev_ values for decoding POC of the next picture. */
464  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
465  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
466  if (nal.ref_idc != 0) {
467  if (!got_reset) {
468  p->poc.prev_poc_msb = p->poc.poc_msb;
469  p->poc.prev_poc_lsb = p->poc.poc_lsb;
470  } else {
471  p->poc.prev_poc_msb = 0;
472  p->poc.prev_poc_lsb =
473  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
474  }
475  }
476 
477  if (sps->pic_struct_present_flag) {
478  switch (p->sei.picture_timing.pic_struct) {
481  s->repeat_pict = 0;
482  break;
486  s->repeat_pict = 1;
487  break;
490  s->repeat_pict = 2;
491  break;
493  s->repeat_pict = 3;
494  break;
496  s->repeat_pict = 5;
497  break;
498  default:
499  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
500  break;
501  }
502  } else {
503  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
504  }
505 
506  if (p->picture_structure == PICT_FRAME) {
508  if (sps->pic_struct_present_flag) {
509  switch (p->sei.picture_timing.pic_struct) {
513  break;
517  break;
518  default:
520  break;
521  }
522  } else {
523  if (field_poc[0] < field_poc[1])
525  else if (field_poc[0] > field_poc[1])
527  else
529  }
530  } else {
533  else
536  }
537 
538  av_freep(&nal.rbsp_buffer);
539  return 0; /* no need to evaluate the rest */
540  }
541  }
542  if (q264) {
543  av_freep(&nal.rbsp_buffer);
544  return 0;
545  }
546  /* didn't find a picture! */
547  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
548 fail:
549  av_freep(&nal.rbsp_buffer);
550  return -1;
551 }
552 
554  AVCodecContext *avctx,
555  const uint8_t **poutbuf, int *poutbuf_size,
556  const uint8_t *buf, int buf_size)
557 {
558  H264ParseContext *p = s->priv_data;
559  ParseContext *pc = &p->pc;
560  int next;
561 
562  if (!p->got_first) {
563  p->got_first = 1;
564  if (avctx->extradata_size) {
566  &p->ps, &p->is_avc, &p->nal_length_size,
567  avctx->err_recognition, avctx);
568  }
569  }
570 
572  next = buf_size;
573  } else {
574  next = h264_find_frame_end(p, buf, buf_size, avctx);
575 
576  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
577  *poutbuf = NULL;
578  *poutbuf_size = 0;
579  return buf_size;
580  }
581 
582  if (next < 0 && next != END_NOT_FOUND) {
583  av_assert1(pc->last_index + next >= 0);
584  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
585  }
586  }
587 
588  parse_nal_units(s, avctx, buf, buf_size);
589 
590  if (avctx->framerate.num)
591  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
592  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
593  s->dts_sync_point = p->sei.buffering_period.present;
594  s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
595  s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
596  } else {
597  s->dts_sync_point = INT_MIN;
598  s->dts_ref_dts_delta = INT_MIN;
599  s->pts_dts_delta = INT_MIN;
600  }
601 
602  if (s->flags & PARSER_FLAG_ONCE) {
603  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
604  }
605 
606  *poutbuf = buf;
607  *poutbuf_size = buf_size;
608  return next;
609 }
610 
611 static int h264_split(AVCodecContext *avctx,
612  const uint8_t *buf, int buf_size)
613 {
614  uint32_t state = -1;
615  int has_sps = 0;
616  int has_pps = 0;
617  const uint8_t *ptr = buf, *end = buf + buf_size;
618  int nalu_type;
619 
620  while (ptr < end) {
621  ptr = avpriv_find_start_code(ptr, end, &state);
622  if ((state & 0xFFFFFF00) != 0x100)
623  break;
624  nalu_type = state & 0x1F;
625  if (nalu_type == NAL_SPS) {
626  has_sps = 1;
627  } else if (nalu_type == NAL_PPS)
628  has_pps = 1;
629  /* else if (nalu_type == 0x01 ||
630  * nalu_type == 0x02 ||
631  * nalu_type == 0x05) {
632  * }
633  */
634  else if ((nalu_type != NAL_SEI || has_pps) &&
635  nalu_type != NAL_AUD && nalu_type != NAL_SPS_EXT &&
636  nalu_type != 0x0f) {
637  if (has_sps) {
638  while (ptr - 4 > buf && ptr[-5] == 0)
639  ptr--;
640  return ptr - 4 - buf;
641  }
642  }
643  }
644 
645  return 0;
646 }
647 
649 {
650  H264ParseContext *p = s->priv_data;
651  ParseContext *pc = &p->pc;
652 
653  av_freep(&pc->buffer);
654 
655  ff_h264_sei_uninit(&p->sei);
656  ff_h264_ps_uninit(&p->ps);
657 }
658 
660 {
661  H264ParseContext *p = s->priv_data;
662 
663  ff_h264dsp_init(&p->h264dsp, 8, 1);
664  return 0;
665 }
666 
669  .priv_data_size = sizeof(H264ParseContext),
670  .parser_init = init,
671  .parser_parse = h264_parse,
672  .parser_close = h264_close,
673  .split = h264_split,
674 };
int chroma_format_idc
Definition: h264.h:140
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3337
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int recovery_frame_cnt
recovery_frame_cnt
Definition: h264_sei.h:109
int size
Definition: h2645_parse.h:33
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
Definition: h264.h:123
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.h:208
memory handling functions
AVBufferRef * sps_list[MAX_SPS_COUNT]
Definition: h264.h:230
ParseContext pc
Definition: h264_parser.c:49
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:5060
#define MAX_PPS_COUNT
Definition: h264.h:54
Sequence parameter set.
Definition: h264.h:136
uint8_t parse_history[6]
Definition: h264_parser.c:58
enum AVFieldOrder field_order
Definition: avcodec.h:5037
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:206
int num
numerator
Definition: rational.h:44
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:244
int codec_ids[5]
Definition: avcodec.h:5081
Picture parameter set.
Definition: h264.h:200
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5066
external API header
int frame_mbs_only_flag
Definition: h264.h:153
3: top field, bottom field, in that order
Definition: h264_sei.h:45
MMCOOpcode
Memory management control operation opcode.
Definition: h264.h:244
void ff_h264_sei_uninit(H264SEIContext *h)
Reset SEI values at the beginning of the frame.
Definition: h264_sei.c:39
H264DSPContext h264dsp
Definition: h264_parser.c:51
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:257
8: frame tripling
Definition: h264_sei.h:50
int profile
profile
Definition: avcodec.h:3152
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:40
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1785
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264.h:161
const PPS * pps
Definition: h264.h:236
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5047
uint8_t
#define av_cold
Definition: attributes.h:82
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264.h:159
int frame_num_offset
for POC type 2
Definition: h264_parse.h:50
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static int get_avc_nalsize(H264ParseContext *p, const uint8_t *buf, int buf_size, int *buf_index, void *logctx)
Definition: h264_parser.c:229
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264.h:973
Definition: h264.h:117
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264.h:160
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1763
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:412
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
int redundant_pic_cnt_present
redundant_pic_cnt_present_flag
Definition: h264.h:214
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 / AVC / MPEG-4 part10 codec.
Definition: h264.h:124
H264POCContext poc
Definition: h264_parser.c:52
#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.h:143
H264ParamSets ps
Definition: h264_parser.c:50
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:479
#define AVERROR(e)
Definition: error.h:43
int weighted_pred
weighted_pred_flag
Definition: h264.h:207
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:344
const uint8_t ff_h264_golomb_to_pict_type[5]
Definition: h264data.c:37
#define fail()
Definition: checkasm.h:81
int delta_pic_order_always_zero_flag
Definition: h264.h:145
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:191
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:25
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:339
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:48
Context for storing H.264 DSP functions.
Definition: h264dsp.h:41
int ref_frame_count
num_ref_frames
Definition: h264.h:149
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2935
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp.c:67
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:3241
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1794
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:63
Definition: h264.h:122
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:340
int type
NAL unit type.
Definition: h2645_parse.h:50
2: bottom field
Definition: h264_sei.h:44
AVCodecParser ff_h264_parser
Definition: h264_parser.c:667
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.h:203
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:648
uint8_t * buffer
Definition: parser.h:29
AVBufferRef * pps_list[MAX_PPS_COUNT]
Definition: h264.h:231
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:45
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:1648
H264SEIContext sei
Definition: h264_parser.c:53
uint8_t * data
The data buffer.
Definition: buffer.h:89
Definition: h264.h:245
const uint8_t * data
Definition: h2645_parse.h:34
void * buf
Definition: avisynth_c.h:553
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
int extradata_size
Definition: avcodec.h:1764
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:341
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:52
static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:611
int index
Definition: gxfenc.c:89
5: top field, bottom field, top field repeated, in that order
Definition: h264_sei.h:47
rational number numerator/denominator
Definition: rational.h:43
#define MAX_MMCO_COUNT
Definition: h264.h:56
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:338
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264.h:201
H264SEIPictureTiming picture_timing
Definition: h264_sei.h:147
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264.h:144
H264SEIRecoveryPoint recovery_point
Definition: h264_sei.h:151
static struct @228 state
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5055
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:342
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
int pic_struct_present_flag
Definition: h264.h:183
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:49
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4948
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int bit_length)
Decode PPS.
Definition: h264_ps.c:706
int mb_height
pic_height_in_map_units_minus1 + 1
Definition: h264.h:152
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
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264.h:142
H264SEIFramePacking frame_packing
Definition: h264_sei.h:153
Bi-dir predicted.
Definition: avutil.h:268
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4947
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:659
GetBitContext gb
Definition: h2645_parse.h:45
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264.h:189
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:318
int delta_poc[2]
Definition: h264_parse.h:46
#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:64
4: bottom field, top field, in that order
Definition: h264_sei.h:46
pixel format definitions
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5077
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264.h:151
SPS * sps
Definition: h264.h:238
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4931
1: top field
Definition: h264_sei.h:43
Definition: h264.h:121
uint8_t * rbsp_buffer
Definition: h2645_parse.h:30
#define av_freep(p)
void ff_h264_ps_uninit(H264ParamSets *ps)
Uninit H264 param sets structure.
Definition: h264_ps.c:301
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx)
Definition: h264_sei.c:380
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:51
int ff_h2645_extract_rbsp(const uint8_t *src, int length, H2645NAL *nal)
Extract the raw (unescaped) bitstream.
Definition: h2645_parse.c:32
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:553
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264.h:162
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4962
int level_idc
Definition: h264.h:139
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, void *logctx)
Definition: h264_parser.c:151
6: bottom field, top field, bottom field repeated, in that order
Definition: h264_sei.h:48
Predicted.
Definition: avutil.h:267