FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
h264_parser.c
Go to the documentation of this file.
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 / MPEG4 part10 parser.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include "libavutil/attributes.h"
31 #include "parser.h"
32 #include "h264data.h"
33 #include "golomb.h"
34 #include "internal.h"
35 #include "mpegutils.h"
36 
37 typedef struct H264ParseContext {
40  int got_first;
42 
43 
45  int buf_size)
46 {
47  H264Context *h = &p->h;
48  int i, j;
49  uint32_t state;
50  ParseContext *pc = &p->pc;
51 
52  int next_avc= h->is_avc ? 0 : buf_size;
53 // mb_addr= pc->mb_addr - 1;
54  state = pc->state;
55  if (state > 13)
56  state = 7;
57 
58  if (h->is_avc && !h->nal_length_size)
59  av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
60 
61  for (i = 0; i < buf_size; i++) {
62  if (i >= next_avc) {
63  int nalsize = 0;
64  i = next_avc;
65  for (j = 0; j < h->nal_length_size; j++)
66  nalsize = (nalsize << 8) | buf[i++];
67  if (nalsize <= 0 || nalsize > buf_size - i) {
68  av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
69  return buf_size;
70  }
71  next_avc = i + nalsize;
72  state = 5;
73  }
74 
75  if (state == 7) {
76  i += h->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
77  if (i < next_avc)
78  state = 2;
79  } else if (state <= 2) {
80  if (buf[i] == 1)
81  state ^= 5; // 2->7, 1->4, 0->5
82  else if (buf[i])
83  state = 7;
84  else
85  state >>= 1; // 2->1, 1->0, 0->0
86  } else if (state <= 5) {
87  int nalu_type = buf[i] & 0x1F;
88  if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
89  nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
90  if (pc->frame_start_found) {
91  i++;
92  goto found;
93  }
94  } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
95  nalu_type == NAL_IDR_SLICE) {
96  state += 8;
97  continue;
98  }
99  state = 7;
100  } else {
101  h->parse_history[h->parse_history_count++]= buf[i];
102  if (h->parse_history_count>5) {
103  unsigned int mb, last_mb= h->parse_last_mb;
104  GetBitContext gb;
105 
107  h->parse_history_count=0;
108  mb= get_ue_golomb_long(&gb);
109  h->parse_last_mb= mb;
110  if (pc->frame_start_found) {
111  if (mb <= last_mb)
112  goto found;
113  } else
114  pc->frame_start_found = 1;
115  state = 7;
116  }
117  }
118  }
119  pc->state = state;
120  if (h->is_avc)
121  return next_avc;
122  return END_NOT_FOUND;
123 
124 found:
125  pc->state = 7;
126  pc->frame_start_found = 0;
127  if (h->is_avc)
128  return next_avc;
129  return i - (state & 5) - 5 * (state > 7);
130 }
131 
133 {
134  H264ParseContext *p = s->priv_data;
135  H264Context *h = &p->h;
136  H264SliceContext *sl = &h->slice_ctx[0];
137 
138  sl->slice_type_nos = s->pict_type & 3;
139 
141  get_ue_golomb(&sl->gb); // redundant_pic_count
142 
143  if (ff_set_ref_count(h, sl) < 0)
144  return AVERROR_INVALIDDATA;
145 
146  if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
147  int list;
148  for (list = 0; list < sl->list_count; list++) {
149  if (get_bits1(&sl->gb)) {
150  int index;
151  for (index = 0; ; index++) {
152  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
153 
154  if (reordering_of_pic_nums_idc < 3)
155  get_ue_golomb_long(&sl->gb);
156  else if (reordering_of_pic_nums_idc > 3) {
158  "illegal reordering_of_pic_nums_idc %d\n",
159  reordering_of_pic_nums_idc);
160  return AVERROR_INVALIDDATA;
161  } else
162  break;
163 
164  if (index >= sl->ref_count[list]) {
166  "reference count %d overflow\n", index);
167  return AVERROR_INVALIDDATA;
168  }
169  }
170  }
171  }
172  }
173 
174  if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
176  ff_pred_weight_table(h, sl);
177 
178  if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
179  int i;
180  for (i = 0; i < MAX_MMCO_COUNT; i++) {
181  MMCOOpcode opcode = get_ue_golomb_31(&sl->gb);
182  if (opcode > (unsigned) MMCO_LONG) {
184  "illegal memory management control operation %d\n",
185  opcode);
186  return AVERROR_INVALIDDATA;
187  }
188  if (opcode == MMCO_END)
189  return 0;
190  else if (opcode == MMCO_RESET)
191  return 1;
192 
193  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
194  get_ue_golomb_long(&sl->gb); // difference_of_pic_nums_minus1
195  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
196  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
197  get_ue_golomb_31(&sl->gb);
198  }
199  }
200 
201  return 0;
202 }
203 
204 /**
205  * Parse NAL units of found picture and decode some basic information.
206  *
207  * @param s parser context.
208  * @param avctx codec context.
209  * @param buf buffer with field/frame data.
210  * @param buf_size size of the buffer.
211  */
213  AVCodecContext *avctx,
214  const uint8_t * const buf, int buf_size)
215 {
216  H264ParseContext *p = s->priv_data;
217  H264Context *h = &p->h;
218  H264SliceContext *sl = &h->slice_ctx[0];
219  int buf_index, next_avc;
220  unsigned int pps_id;
221  unsigned int slice_type;
222  int state = -1, got_reset = 0;
223  const uint8_t *ptr;
224  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
225  int field_poc[2];
226 
227  /* set some sane default values */
229  s->key_frame = 0;
231 
232  h->avctx = avctx;
235 
236  if (!buf_size)
237  return 0;
238 
239  buf_index = 0;
240  next_avc = h->is_avc ? 0 : buf_size;
241  for (;;) {
242  int src_length, dst_length, consumed, nalsize = 0;
243 
244  if (buf_index >= next_avc) {
245  nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index);
246  if (nalsize < 0)
247  break;
248  next_avc = buf_index + nalsize;
249  } else {
250  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
251  if (buf_index >= buf_size)
252  break;
253  if (buf_index >= next_avc)
254  continue;
255  }
256  src_length = next_avc - buf_index;
257 
258  state = buf[buf_index];
259  switch (state & 0x1f) {
260  case NAL_SLICE:
261  case NAL_IDR_SLICE:
262  // Do not walk the whole buffer just to decode slice header
263  if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
264  /* IDR or disposable slice
265  * No need to decode many bytes because MMCOs shall not be present. */
266  if (src_length > 60)
267  src_length = 60;
268  } else {
269  /* To decode up to MMCOs */
270  if (src_length > 1000)
271  src_length = 1000;
272  }
273  break;
274  }
275  ptr = ff_h264_decode_nal(h, sl, buf + buf_index, &dst_length,
276  &consumed, src_length);
277  if (!ptr || dst_length < 0)
278  break;
279 
280  buf_index += consumed;
281 
282  init_get_bits(&h->gb, ptr, 8 * dst_length);
283  switch (h->nal_unit_type) {
284  case NAL_SPS:
286  break;
287  case NAL_PPS:
289  break;
290  case NAL_SEI:
292  break;
293  case NAL_IDR_SLICE:
294  s->key_frame = 1;
295 
296  h->prev_frame_num = 0;
297  h->prev_frame_num_offset = 0;
298  h->prev_poc_msb =
299  h->prev_poc_lsb = 0;
300  /* fall through */
301  case NAL_SLICE:
302  init_get_bits(&sl->gb, ptr, 8 * dst_length);
303  get_ue_golomb_long(&sl->gb); // skip first_mb_in_slice
304  slice_type = get_ue_golomb_31(&sl->gb);
305  s->pict_type = golomb_to_pict_type[slice_type % 5];
306  if (h->sei_recovery_frame_cnt >= 0) {
307  /* key frame, since recovery_frame_cnt is set */
308  s->key_frame = 1;
309  }
310  pps_id = get_ue_golomb(&sl->gb);
311  if (pps_id >= MAX_PPS_COUNT) {
313  "pps_id %u out of range\n", pps_id);
314  return -1;
315  }
316  if (!h->pps_buffers[pps_id]) {
318  "non-existing PPS %u referenced\n", pps_id);
319  return -1;
320  }
321  h->pps = *h->pps_buffers[pps_id];
322  if (!h->sps_buffers[h->pps.sps_id]) {
324  "non-existing SPS %u referenced\n", h->pps.sps_id);
325  return -1;
326  }
327  h->sps = *h->sps_buffers[h->pps.sps_id];
328  h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
329 
330  if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
331  s->key_frame = 1;
332 
333  s->coded_width = 16 * h->sps.mb_width;
334  s->coded_height = 16 * h->sps.mb_height;
335  s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
336  s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
337  if (s->width <= 0 || s->height <= 0) {
338  s->width = s->coded_width;
339  s->height = s->coded_height;
340  }
341 
342  switch (h->sps.bit_depth_luma) {
343  case 9:
344  if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
345  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
346  else s->format = AV_PIX_FMT_YUV420P9;
347  break;
348  case 10:
350  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
351  else s->format = AV_PIX_FMT_YUV420P10;
352  break;
353  case 8:
355  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
356  else s->format = AV_PIX_FMT_YUV420P;
357  break;
358  default:
359  s->format = AV_PIX_FMT_NONE;
360  }
361 
362  avctx->profile = ff_h264_get_profile(&h->sps);
363  avctx->level = h->sps.level_idc;
364 
365  if (h->sps.frame_mbs_only_flag) {
367  } else {
368  if (get_bits1(&sl->gb)) { // field_pic_flag
369  h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
370  } else {
372  }
373  }
374 
375  if (h->nal_unit_type == NAL_IDR_SLICE)
376  get_ue_golomb_long(&sl->gb); /* idr_pic_id */
377  if (h->sps.poc_type == 0) {
378  h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
379 
380  if (h->pps.pic_order_present == 1 &&
382  h->delta_poc_bottom = get_se_golomb(&sl->gb);
383  }
384 
385  if (h->sps.poc_type == 1 &&
387  h->delta_poc[0] = get_se_golomb(&sl->gb);
388 
389  if (h->pps.pic_order_present == 1 &&
391  h->delta_poc[1] = get_se_golomb(&sl->gb);
392  }
393 
394  /* Decode POC of this picture.
395  * The prev_ values needed for decoding POC of the next picture are not set here. */
396  field_poc[0] = field_poc[1] = INT_MAX;
397  ff_init_poc(h, field_poc, &s->output_picture_number);
398 
399  /* Continue parsing to check if MMCO_RESET is present.
400  * FIXME: MMCO_RESET could appear in non-first slice.
401  * Maybe, we should parse all undisposable non-IDR slice of this
402  * picture until encountering MMCO_RESET in a slice of it. */
403  if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
404  got_reset = scan_mmco_reset(s);
405  if (got_reset < 0)
406  return got_reset;
407  }
408 
409  /* Set up the prev_ values for decoding POC of the next picture. */
410  h->prev_frame_num = got_reset ? 0 : h->frame_num;
411  h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
412  if (h->nal_ref_idc != 0) {
413  if (!got_reset) {
414  h->prev_poc_msb = h->poc_msb;
415  h->prev_poc_lsb = h->poc_lsb;
416  } else {
417  h->prev_poc_msb = 0;
418  h->prev_poc_lsb =
419  h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
420  }
421  }
422 
423  if (h->sps.pic_struct_present_flag) {
424  switch (h->sei_pic_struct) {
427  s->repeat_pict = 0;
428  break;
432  s->repeat_pict = 1;
433  break;
436  s->repeat_pict = 2;
437  break;
439  s->repeat_pict = 3;
440  break;
442  s->repeat_pict = 5;
443  break;
444  default:
445  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
446  break;
447  }
448  } else {
449  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
450  }
451 
452  if (h->picture_structure == PICT_FRAME) {
454  if (h->sps.pic_struct_present_flag) {
455  switch (h->sei_pic_struct) {
459  break;
463  break;
464  default:
466  break;
467  }
468  } else {
469  if (field_poc[0] < field_poc[1])
471  else if (field_poc[0] > field_poc[1])
473  else
475  }
476  } else {
479  else
482  }
483 
484  return 0; /* no need to evaluate the rest */
485  }
486  }
487  if (q264)
488  return 0;
489  /* didn't find a picture! */
490  av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
491  return -1;
492 }
493 
495  AVCodecContext *avctx,
496  const uint8_t **poutbuf, int *poutbuf_size,
497  const uint8_t *buf, int buf_size)
498 {
499  H264ParseContext *p = s->priv_data;
500  H264Context *h = &p->h;
501  ParseContext *pc = &p->pc;
502  int next;
503 
504  if (!p->got_first) {
505  p->got_first = 1;
506  if (avctx->extradata_size) {
507  h->avctx = avctx;
508  // must be done like in decoder, otherwise opening the parser,
509  // letting it create extradata and then closing and opening again
510  // will cause has_b_frames to be always set.
511  // Note that estimate_timings_from_pts does exactly this.
512  if (!avctx->has_b_frames)
513  h->low_delay = 1;
515  }
516  }
517 
519  next = buf_size;
520  } else {
521  next = h264_find_frame_end(p, buf, buf_size);
522 
523  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
524  *poutbuf = NULL;
525  *poutbuf_size = 0;
526  return buf_size;
527  }
528 
529  if (next < 0 && next != END_NOT_FOUND) {
530  av_assert1(pc->last_index + next >= 0);
531  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
532  }
533  }
534 
535  parse_nal_units(s, avctx, buf, buf_size);
536 
537  if (avctx->framerate.num)
538  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
539  if (h->sei_cpb_removal_delay >= 0) {
540  s->dts_sync_point = h->sei_buffering_period_present;
541  s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
542  s->pts_dts_delta = h->sei_dpb_output_delay;
543  } else {
544  s->dts_sync_point = INT_MIN;
545  s->dts_ref_dts_delta = INT_MIN;
546  s->pts_dts_delta = INT_MIN;
547  }
548 
549  if (s->flags & PARSER_FLAG_ONCE) {
550  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
551  }
552 
553  *poutbuf = buf;
554  *poutbuf_size = buf_size;
555  return next;
556 }
557 
558 static int h264_split(AVCodecContext *avctx,
559  const uint8_t *buf, int buf_size)
560 {
561  uint32_t state = -1;
562  int has_sps = 0;
563  int has_pps = 0;
564  const uint8_t *ptr = buf, *end = buf + buf_size;
565  int nalu_type;
566 
567  while (ptr < end) {
568  ptr = avpriv_find_start_code(ptr, end, &state);
569  if ((state & 0xFFFFFF00) != 0x100)
570  break;
571  nalu_type = state & 0x1F;
572  if (nalu_type == NAL_SPS) {
573  has_sps = 1;
574  } else if (nalu_type == NAL_PPS)
575  has_pps = 1;
576  /* else if (nalu_type == 0x01 ||
577  * nalu_type == 0x02 ||
578  * nalu_type == 0x05) {
579  * }
580  */
581  else if ((nalu_type != NAL_SEI || has_pps) &&
582  nalu_type != NAL_AUD && nalu_type != NAL_SPS_EXT &&
583  nalu_type != 0x0f) {
584  if (has_sps) {
585  while (ptr - 4 > buf && ptr[-5] == 0)
586  ptr--;
587  return ptr - 4 - buf;
588  }
589  }
590  }
591 
592  return 0;
593 }
594 
596 {
597  H264ParseContext *p = s->priv_data;
598  H264Context *h = &p->h;
599  ParseContext *pc = &p->pc;
600 
601  av_freep(&pc->buffer);
603 }
604 
606 {
607  H264ParseContext *p = s->priv_data;
608  H264Context *h = &p->h;
609 
610  h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
611  if (!h->slice_ctx)
612  return 0;
613  h->nb_slice_ctx = 1;
614 
615  h->slice_context_count = 1;
616  ff_h264dsp_init(&h->h264dsp, 8, 1);
617  return 0;
618 }
619 
622  .priv_data_size = sizeof(H264ParseContext),
623  .parser_init = init,
624  .parser_parse = h264_parse,
625  .parser_close = h264_close,
626  .split = h264_split,
627 };
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3212
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
GetBitContext gb
Definition: h264.h:529
5: top field, bottom field, top field repeated, in that order
Definition: h264.h:153
int low_delay
Definition: h264.h:555
uint8_t parse_history[6]
Definition: h264.h:827
int delta_poc[2]
Definition: h264.h:654
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
#define CHROMA444(h)
Definition: h264.h:100
Definition: h264.h:120
3: top field, bottom field, in that order
Definition: h264.h:151
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:68
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
int weighted_bipred_idc
Definition: h264.h:248
ParseContext pc
Definition: h264_parser.c:39
const uint8_t * ff_h264_decode_nal(H264Context *h, H264SliceContext *sl, const uint8_t *src, int *dst_length, int *consumed, int length)
Decode a network abstraction layer unit.
Definition: h264.c:229
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:4568
7: frame doubling
Definition: h264.h:155
#define MAX_PPS_COUNT
Definition: h264.h:51
enum AVFieldOrder field_order
Definition: avcodec.h:4545
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:246
int num
numerator
Definition: rational.h:44
static int scan_mmco_reset(AVCodecParserContext *s)
Definition: h264_parser.c:132
int codec_ids[5]
Definition: avcodec.h:4589
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:4574
int frame_mbs_only_flag
Definition: h264.h:192
int is_avc
Used to parse AVC variant of h264.
Definition: h264.h:637
MMCOOpcode
Memory management control operation opcode.
Definition: h264.h:295
int ff_h264_get_profile(SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264.c:1224
H264Context.
Definition: h264.h:522
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264.h:656
4: bottom field, top field, in that order
Definition: h264.h:152
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:212
int profile
profile
Definition: avcodec.h:3028
int frame_start_found
Definition: parser.h:34
int picture_structure
Definition: h264.h:595
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:465
int ff_set_ref_count(H264Context *h, H264SliceContext *sl)
Definition: h264.c:1244
Macro definitions for various function/variable attributes.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1661
static const uint8_t golomb_to_pict_type[5]
Definition: h264data.h:37
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264.h:200
int parse_history_count
Definition: h264.h:828
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:4555
H264Context h
Definition: h264_parser.c:38
uint8_t
#define av_cold
Definition: attributes.h:82
int prev_frame_num_offset
for POC type 2
Definition: h264.h:659
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264.h:198
void ff_h264_reset_sei(H264Context *h)
Reset SEI values at the beginning of the frame.
Definition: h264_sei.c:37
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264.h:1177
Definition: h264.h:114
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264.h:199
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1647
#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:254
#define av_log(a,...)
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
Definition: h264.h:121
int frame_num
Definition: h264.h:655
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1846
static int get_ue_golomb(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to 8190.
Definition: golomb.h:53
int poc_type
pic_order_cnt_type
Definition: h264.h:182
int nal_unit_type
Definition: h264.h:632
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:243
int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
Definition: h264.c:1139
int parse_last_mb
Definition: h264.h:829
int ff_pred_weight_table(H264Context *h, H264SliceContext *sl)
Definition: h264.c:1002
PPS pps
current pps
Definition: h264.h:582
0: frame
Definition: h264.h:148
int weighted_pred
weighted_pred_flag
Definition: h264.h:247
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:333
int delta_pic_order_always_zero_flag
Definition: h264.h:184
int slice_type_nos
S free slice type (SI/SP are remapped to I/P)
Definition: h264.h:374
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:67
int nal_length_size
Number of bytes used for nal length (1, 2 or 4)
Definition: h264.h:638
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:328
int ref_frame_count
num_ref_frames
Definition: h264.h:188
int frame_num_offset
for POC type 2
Definition: h264.h:658
FPA sei_fpa
Definition: h264.h:786
#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 nb_slice_ctx
Definition: h264.h:537
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: h264dsp.h:116
SPS sps
current sps
Definition: h264.h:581
int size_in_bits
Definition: get_bits.h:57
PPS * pps_buffers[MAX_PPS_COUNT]
Definition: h264.h:644
int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
Decode PPS.
Definition: h264_ps.c:630
int level
level
Definition: avcodec.h:3117
H264SliceContext * slice_ctx
Definition: h264.h:536
int poc_lsb
Definition: h264.h:651
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1670
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:44
Definition: h264.h:119
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:329
AVCodecParser ff_h264_parser
Definition: h264_parser.c:620
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:243
SPS * sps_buffers[MAX_SPS_COUNT]
Definition: h264.h:643
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:595
AVCodecContext * avctx
Definition: h264.h:524
uint8_t * buffer
Definition: parser.h:29
H264 / AVC / MPEG4 part10 codec data table
1: top field
Definition: h264.h:149
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:100
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264.h:660
int ff_h264_decode_sei(H264Context *h)
Decode SEI.
Definition: h264_sei.c:421
int poc_msb
Definition: h264.h:652
main external API structure.
Definition: avcodec.h:1532
Definition: h264.h:296
2: bottom field
Definition: h264.h:150
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:1648
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:312
SEI_PicStructType sei_pic_struct
pic_struct in picture timing SEI message
Definition: h264.h:722
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:330
static int get_avc_nalsize(H264Context *h, const uint8_t *buf, int buf_size, int *buf_index)
Definition: h264.h:1187
static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:558
#define CHROMA422(h)
Definition: h264.h:99
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
#define MAX_MMCO_COUNT
Definition: h264.h:53
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:418
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:327
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264.h:241
int frame_packing_arrangement_cancel_flag
is previous arrangement canceled, -1 if never received
Definition: h264.h:269
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264.h:183
6: bottom field, top field, bottom field repeated, in that order
Definition: h264.h:154
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:4563
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:331
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:222
unsigned int list_count
Definition: h264.h:466
av_cold void ff_h264_free_context(H264Context *h)
Free any data that may have been allocated in the H264 context like SPS, PPS etc. ...
Definition: h264.c:1911
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4456
int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:323
int slice_context_count
Definition: h264.h:707
int mb_height
pic_height_in_map_units_minus1 + 1
Definition: h264.h:191
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)
Definition: h264.c:530
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264.h:181
Bi-dir predicted.
Definition: avutil.h:268
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4455
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:605
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264.h:228
#define PICT_FRAME
Definition: mpegutils.h:39
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264.h:657
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:4585
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264.h:190
int delta_poc_bottom
Definition: h264.h:653
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4439
H264DSPContext h264dsp
Definition: h264.h:526
Definition: h264.h:118
static struct @205 state
#define av_freep(p)
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:494
8: frame tripling
Definition: h264.h:156
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264.h:201
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4470
int sei_recovery_frame_cnt
recovery_frame_cnt from SEI message
Definition: h264.h:779
int level_idc
Definition: h264.h:178
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int nal_ref_idc
Definition: h264.h:631
GetBitContext gb
Definition: h264.h:369
Predicted.
Definition: avutil.h:267