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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 / 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 
137  h->slice_type_nos = s->pict_type & 3;
138 
140  get_ue_golomb(&h->gb); // redundant_pic_count
141 
142  if (ff_set_ref_count(h) < 0)
143  return AVERROR_INVALIDDATA;
144 
145  if (h->slice_type_nos != AV_PICTURE_TYPE_I) {
146  int list;
147  for (list = 0; list < h->list_count; list++) {
148  if (get_bits1(&h->gb)) {
149  int index;
150  for (index = 0; ; index++) {
151  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
152 
153  if (reordering_of_pic_nums_idc < 3)
154  get_ue_golomb(&h->gb);
155  else if (reordering_of_pic_nums_idc > 3) {
157  "illegal reordering_of_pic_nums_idc %d\n",
158  reordering_of_pic_nums_idc);
159  return AVERROR_INVALIDDATA;
160  } else
161  break;
162 
163  if (index >= h->ref_count[list]) {
165  "reference count %d overflow\n", index);
166  return AVERROR_INVALIDDATA;
167  }
168  }
169  }
170  }
171  }
172 
176 
177  if (get_bits1(&h->gb)) { // adaptive_ref_pic_marking_mode_flag
178  int i;
179  for (i = 0; i < MAX_MMCO_COUNT; i++) {
180  MMCOOpcode opcode = get_ue_golomb_31(&h->gb);
181  if (opcode > (unsigned) MMCO_LONG) {
183  "illegal memory management control operation %d\n",
184  opcode);
185  return AVERROR_INVALIDDATA;
186  }
187  if (opcode == MMCO_END)
188  return 0;
189  else if (opcode == MMCO_RESET)
190  return 1;
191 
192  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
193  get_ue_golomb(&h->gb);
194  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
195  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
196  get_ue_golomb_31(&h->gb);
197  }
198  }
199 
200  return 0;
201 }
202 
203 /**
204  * Parse NAL units of found picture and decode some basic information.
205  *
206  * @param s parser context.
207  * @param avctx codec context.
208  * @param buf buffer with field/frame data.
209  * @param buf_size size of the buffer.
210  */
212  AVCodecContext *avctx,
213  const uint8_t * const buf, int buf_size)
214 {
215  H264ParseContext *p = s->priv_data;
216  H264Context *h = &p->h;
217  int buf_index, next_avc;
218  unsigned int pps_id;
219  unsigned int slice_type;
220  int state = -1, got_reset = 0;
221  const uint8_t *ptr;
222  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
223  int field_poc[2];
224 
225  /* set some sane default values */
227  s->key_frame = 0;
229 
230  h->avctx = avctx;
233 
234  if (!buf_size)
235  return 0;
236 
237  buf_index = 0;
238  next_avc = h->is_avc ? 0 : buf_size;
239  for (;;) {
240  int src_length, dst_length, consumed, nalsize = 0;
241 
242  if (buf_index >= next_avc) {
243  nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index);
244  if (nalsize < 0)
245  break;
246  next_avc = buf_index + nalsize;
247  } else {
248  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
249  if (buf_index >= buf_size)
250  break;
251  if (buf_index >= next_avc)
252  continue;
253  }
254  src_length = next_avc - buf_index;
255 
256  state = buf[buf_index];
257  switch (state & 0x1f) {
258  case NAL_SLICE:
259  case NAL_IDR_SLICE:
260  // Do not walk the whole buffer just to decode slice header
261  if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
262  /* IDR or disposable slice
263  * No need to decode many bytes because MMCOs shall not be present. */
264  if (src_length > 60)
265  src_length = 60;
266  } else {
267  /* To decode up to MMCOs */
268  if (src_length > 1000)
269  src_length = 1000;
270  }
271  break;
272  }
273  ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length,
274  &consumed, src_length);
275  if (!ptr || dst_length < 0)
276  break;
277 
278  buf_index += consumed;
279 
280  init_get_bits(&h->gb, ptr, 8 * dst_length);
281  switch (h->nal_unit_type) {
282  case NAL_SPS:
284  break;
285  case NAL_PPS:
287  break;
288  case NAL_SEI:
290  break;
291  case NAL_IDR_SLICE:
292  s->key_frame = 1;
293 
294  h->prev_frame_num = 0;
295  h->prev_frame_num_offset = 0;
296  h->prev_poc_msb =
297  h->prev_poc_lsb = 0;
298  /* fall through */
299  case NAL_SLICE:
300  get_ue_golomb_long(&h->gb); // skip first_mb_in_slice
301  slice_type = get_ue_golomb_31(&h->gb);
302  s->pict_type = golomb_to_pict_type[slice_type % 5];
303  if (h->sei_recovery_frame_cnt >= 0) {
304  /* key frame, since recovery_frame_cnt is set */
305  s->key_frame = 1;
306  }
307  pps_id = get_ue_golomb(&h->gb);
308  if (pps_id >= MAX_PPS_COUNT) {
310  "pps_id %u out of range\n", pps_id);
311  return -1;
312  }
313  if (!h->pps_buffers[pps_id]) {
315  "non-existing PPS %u referenced\n", pps_id);
316  return -1;
317  }
318  h->pps = *h->pps_buffers[pps_id];
319  if (!h->sps_buffers[h->pps.sps_id]) {
321  "non-existing SPS %u referenced\n", h->pps.sps_id);
322  return -1;
323  }
324  h->sps = *h->sps_buffers[h->pps.sps_id];
326 
327  if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
328  s->key_frame = 1;
329 
330  s->coded_width = 16 * h->sps.mb_width;
331  s->coded_height = 16 * h->sps.mb_height;
332  s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
333  s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
334  if (s->width <= 0 || s->height <= 0) {
335  s->width = s->coded_width;
336  s->height = s->coded_height;
337  }
338 
339  switch (h->sps.bit_depth_luma) {
340  case 9:
341  if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
342  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
343  else s->format = AV_PIX_FMT_YUV420P9;
344  break;
345  case 10:
347  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
348  else s->format = AV_PIX_FMT_YUV420P10;
349  break;
350  case 8:
352  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
353  else s->format = AV_PIX_FMT_YUV420P;
354  break;
355  default:
356  s->format = AV_PIX_FMT_NONE;
357  }
358 
359  avctx->profile = ff_h264_get_profile(&h->sps);
360  avctx->level = h->sps.level_idc;
361 
362  if (h->sps.frame_mbs_only_flag) {
364  } else {
365  if (get_bits1(&h->gb)) { // field_pic_flag
366  h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag
367  } else {
369  }
370  }
371 
372  if (h->nal_unit_type == NAL_IDR_SLICE)
373  get_ue_golomb(&h->gb); /* idr_pic_id */
374  if (h->sps.poc_type == 0) {
375  h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb);
376 
377  if (h->pps.pic_order_present == 1 &&
380  }
381 
382  if (h->sps.poc_type == 1 &&
384  h->delta_poc[0] = get_se_golomb(&h->gb);
385 
386  if (h->pps.pic_order_present == 1 &&
388  h->delta_poc[1] = get_se_golomb(&h->gb);
389  }
390 
391  /* Decode POC of this picture.
392  * The prev_ values needed for decoding POC of the next picture are not set here. */
393  field_poc[0] = field_poc[1] = INT_MAX;
394  ff_init_poc(h, field_poc, &s->output_picture_number);
395 
396  /* Continue parsing to check if MMCO_RESET is present.
397  * FIXME: MMCO_RESET could appear in non-first slice.
398  * Maybe, we should parse all undisposable non-IDR slice of this
399  * picture until encountering MMCO_RESET in a slice of it. */
400  if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
401  got_reset = scan_mmco_reset(s);
402  if (got_reset < 0)
403  return got_reset;
404  }
405 
406  /* Set up the prev_ values for decoding POC of the next picture. */
407  h->prev_frame_num = got_reset ? 0 : h->frame_num;
408  h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
409  if (h->nal_ref_idc != 0) {
410  if (!got_reset) {
411  h->prev_poc_msb = h->poc_msb;
412  h->prev_poc_lsb = h->poc_lsb;
413  } else {
414  h->prev_poc_msb = 0;
415  h->prev_poc_lsb =
416  h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
417  }
418  }
419 
420  if (h->sps.pic_struct_present_flag) {
421  switch (h->sei_pic_struct) {
424  s->repeat_pict = 0;
425  break;
429  s->repeat_pict = 1;
430  break;
433  s->repeat_pict = 2;
434  break;
436  s->repeat_pict = 3;
437  break;
439  s->repeat_pict = 5;
440  break;
441  default:
442  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
443  break;
444  }
445  } else {
446  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
447  }
448 
449  if (h->picture_structure == PICT_FRAME) {
451  if (h->sps.pic_struct_present_flag) {
452  switch (h->sei_pic_struct) {
456  break;
460  break;
461  default:
463  break;
464  }
465  } else {
466  if (field_poc[0] < field_poc[1])
468  else if (field_poc[0] > field_poc[1])
470  else
472  }
473  } else {
476  else
479  }
480 
481  return 0; /* no need to evaluate the rest */
482  }
483  }
484  if (q264)
485  return 0;
486  /* didn't find a picture! */
487  av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
488  return -1;
489 }
490 
492  AVCodecContext *avctx,
493  const uint8_t **poutbuf, int *poutbuf_size,
494  const uint8_t *buf, int buf_size)
495 {
496  H264ParseContext *p = s->priv_data;
497  H264Context *h = &p->h;
498  ParseContext *pc = &p->pc;
499  int next;
500 
501  if (!p->got_first) {
502  p->got_first = 1;
503  if (avctx->extradata_size) {
504  h->avctx = avctx;
505  // must be done like in decoder, otherwise opening the parser,
506  // letting it create extradata and then closing and opening again
507  // will cause has_b_frames to be always set.
508  // Note that estimate_timings_from_pts does exactly this.
509  if (!avctx->has_b_frames)
510  h->low_delay = 1;
512  }
513  }
514 
516  next = buf_size;
517  } else {
518  next = h264_find_frame_end(p, buf, buf_size);
519 
520  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
521  *poutbuf = NULL;
522  *poutbuf_size = 0;
523  return buf_size;
524  }
525 
526  if (next < 0 && next != END_NOT_FOUND) {
527  av_assert1(pc->last_index + next >= 0);
528  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
529  }
530  }
531 
532  parse_nal_units(s, avctx, buf, buf_size);
533 
534  if (avctx->framerate.num)
535  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
536  if (h->sei_cpb_removal_delay >= 0) {
540  } else {
541  s->dts_sync_point = INT_MIN;
542  s->dts_ref_dts_delta = INT_MIN;
543  s->pts_dts_delta = INT_MIN;
544  }
545 
546  if (s->flags & PARSER_FLAG_ONCE) {
548  }
549 
550  *poutbuf = buf;
551  *poutbuf_size = buf_size;
552  return next;
553 }
554 
555 static int h264_split(AVCodecContext *avctx,
556  const uint8_t *buf, int buf_size)
557 {
558  uint32_t state = -1;
559  int has_sps = 0;
560  int has_pps = 0;
561  const uint8_t *ptr = buf, *end = buf + buf_size;
562  int nalu_type;
563 
564  while (ptr < end) {
565  ptr = avpriv_find_start_code(ptr, end, &state);
566  if ((state & 0xFFFFFF00) != 0x100)
567  break;
568  nalu_type = state & 0x1F;
569  if (nalu_type == NAL_SPS) {
570  has_sps = 1;
571  } else if (nalu_type == NAL_PPS)
572  has_pps = 1;
573  /* else if (nalu_type == 0x01 ||
574  * nalu_type == 0x02 ||
575  * nalu_type == 0x05) {
576  * }
577  */
578  else if ((nalu_type != NAL_SEI || has_pps) &&
579  nalu_type != NAL_AUD && nalu_type != NAL_SPS_EXT &&
580  nalu_type != 0x0f) {
581  if (has_sps) {
582  while (ptr - 4 > buf && ptr[-5] == 0)
583  ptr--;
584  return ptr - 4 - buf;
585  }
586  }
587  }
588 
589  return 0;
590 }
591 
593 {
594  H264ParseContext *p = s->priv_data;
595  H264Context *h = &p->h;
596  ParseContext *pc = &p->pc;
597 
598  av_freep(&pc->buffer);
600 }
601 
603 {
604  H264ParseContext *p = s->priv_data;
605  H264Context *h = &p->h;
606  h->thread_context[0] = h;
607  h->slice_context_count = 1;
608  ff_h264dsp_init(&h->h264dsp, 8, 1);
609  return 0;
610 }
611 
614  .priv_data_size = sizeof(H264ParseContext),
615  .parser_init = init,
616  .parser_parse = h264_parse,
617  .parser_close = h264_close,
618  .split = h264_split,
619 };
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3015
const char * s
Definition: avisynth_c.h:669
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
GetBitContext gb
Definition: h264.h:346
5: top field, bottom field, top field repeated, in that order
Definition: h264.h:151
int sei_cpb_removal_delay
cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
Definition: h264.h:698
int low_delay
Definition: h264.h:367
uint8_t parse_history[6]
Definition: h264.h:753
int delta_poc[2]
Definition: h264.h:581
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
#define CHROMA444(h)
Definition: h264.h:99
3: top field, bottom field, in that order
Definition: h264.h:149
const uint8_t * ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length)
Decode a network abstraction layer unit.
Definition: h264.c:233
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:73
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
Definition: h264.h:113
int weighted_bipred_idc
Definition: h264.h:244
ParseContext pc
Definition: h264_parser.c:39
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:4390
7: frame doubling
Definition: h264.h:153
#define MAX_PPS_COUNT
Definition: h264.h:50
enum AVFieldOrder field_order
Definition: avcodec.h:4367
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:242
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:4411
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:4396
int frame_mbs_only_flag
Definition: h264.h:190
int is_avc
Used to parse AVC variant of h264.
Definition: h264.h:564
MMCOOpcode
Memory management control operation opcode.
Definition: h264.h:273
int ff_h264_get_profile(SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264.c:1205
H264Context.
Definition: h264.h:339
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264.h:583
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:4327
4: bottom field, top field, in that order
Definition: h264.h:150
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:211
int profile
profile
Definition: avcodec.h:2833
int frame_start_found
Definition: parser.h:34
int picture_structure
Definition: h264.h:457
int slice_type_nos
S free slice type (SI/SP are remapped to I/P)
Definition: h264.h:450
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:1367
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:198
int parse_history_count
Definition: h264.h:754
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:4377
H264Context h
Definition: h264_parser.c:38
if()
Definition: avfilter.c:975
uint8_t
#define av_cold
Definition: attributes.h:74
int prev_frame_num_offset
for POC type 2
Definition: h264.h:586
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264.h:196
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:67
static int find_start_code(const uint8_t *buf, int buf_size, int buf_index, int next_avc)
Definition: h264.h:1103
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:483
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264.h:197
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1353
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:34
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:250
Definition: h264.h:120
#define av_log(a,...)
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
int frame_num
Definition: h264.h:582
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:175
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1531
static int get_ue_golomb(GetBitContext *gb)
read unsigned exp golomb code.
Definition: golomb.h:53
int poc_type
pic_order_cnt_type
Definition: h264.h:180
int nal_unit_type
Definition: h264.h:557
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:231
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4266
int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
Definition: h264.c:1120
int parse_last_mb
Definition: h264.h:755
PPS pps
current pps
Definition: h264.h:438
0: frame
Definition: h264.h:146
int weighted_pred
weighted_pred_flag
Definition: h264.h:243
#define PICT_TOP_FIELD
Definition: mpegutils.h:33
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:360
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4267
int delta_pic_order_always_zero_flag
Definition: h264.h:182
static char * split(char *message, char delim)
Definition: af_channelmap.c:82
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:72
int ff_pred_weight_table(H264Context *h)
Definition: h264.c:983
int nal_length_size
Number of bytes used for nal length (1, 2 or 4)
Definition: h264.h:565
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:356
int ref_frame_count
num_ref_frames
Definition: h264.h:186
int frame_num_offset
for POC type 2
Definition: h264.h:585
FPA sei_fpa
Definition: h264.h:714
#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
SPS sps
current sps
Definition: h264.h:437
int size_in_bits
Definition: get_bits.h:57
PPS * pps_buffers[MAX_PPS_COUNT]
Definition: h264.h:571
int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
Decode PPS.
Definition: h264_ps.c:586
int level
level
Definition: avcodec.h:2917
int poc_lsb
Definition: h264.h:578
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:44
int ff_set_ref_count(H264Context *h)
Definition: h264.c:1272
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:357
unsigned int list_count
Definition: h264.h:484
AVCodecParser ff_h264_parser
Definition: h264_parser.c:612
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:239
struct H264Context * thread_context[H264_MAX_THREADS]
Definition: h264.h:626
SPS * sps_buffers[MAX_SPS_COUNT]
Definition: h264.h:570
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:592
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:4341
AVCodecContext * avctx
Definition: h264.h:341
uint8_t * buffer
Definition: parser.h:29
H264 / AVC / MPEG4 part10 codec data table
1: top field
Definition: h264.h:147
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:587
int ff_h264_decode_sei(H264Context *h)
Decode SEI.
Definition: h264_sei.c:282
int poc_msb
Definition: h264.h:579
main external API structure.
Definition: avcodec.h:1239
Definition: h264.h:274
2: bottom field
Definition: h264.h:148
void * buf
Definition: avisynth_c.h:595
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
int extradata_size
Definition: avcodec.h:1354
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
SEI_PicStructType sei_pic_struct
pic_struct in picture timing SEI message
Definition: h264.h:658
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:358
static int get_avc_nalsize(H264Context *h, const uint8_t *buf, int buf_size, int *buf_index)
Definition: h264.h:1113
static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:555
#define CHROMA422(h)
Definition: h264.h:98
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
#define MAX_MMCO_COUNT
Definition: h264.h:52
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:355
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264.h:237
int frame_packing_arrangement_cancel_flag
is previous arrangement canceled, -1 if never received
Definition: h264.h:263
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264.h:181
6: bottom field, top field, bottom field repeated, in that order
Definition: h264.h:152
int sei_buffering_period_present
Buffering period SEI flag.
Definition: h264.h:745
static uint32_t state
Definition: trasher.c:27
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:4385
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:359
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:220
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:1920
int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:300
int slice_context_count
Definition: h264.h:641
int mb_height
pic_height_in_map_units_minus1 + 1
Definition: h264.h:189
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:68
common internal api header.
int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)
Definition: h264.c:566
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264.h:179
Bi-dir predicted.
Definition: avutil.h:269
Definition: h264.h:119
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:602
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264.h:226
#define PICT_FRAME
Definition: mpegutils.h:35
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264.h:584
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:4407
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264.h:188
int delta_poc_bottom
Definition: h264.h:580
Definition: h264.h:117
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4250
H264DSPContext h264dsp
Definition: h264.h:343
#define av_freep(p)
Definition: h264.h:118
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:491
8: frame tripling
Definition: h264.h:154
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264.h:199
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4281
int sei_recovery_frame_cnt
recovery_frame_cnt from SEI message
Definition: h264.h:707
int level_idc
Definition: h264.h:176
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:4312
int nal_ref_idc
Definition: h264.h:556
Predicted.
Definition: avutil.h:268
int sei_dpb_output_delay
dpb_output_delay in picture timing SEI message, see H.264 C.2.2
Definition: h264.h:693