Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
28 #include <assert.h>
29 #include <stdint.h>
30 
31 #include "libavutil/avutil.h"
32 #include "libavutil/error.h"
33 #include "libavutil/log.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/pixfmt.h"
36 
37 #include "avcodec.h"
38 #include "get_bits.h"
39 #include "golomb.h"
40 #include "h264.h"
41 #include "h264_sei.h"
42 #include "h264_ps.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;
59 
60 
61 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
62  int buf_size)
63 {
64  int i;
65  uint32_t state;
66  ParseContext *pc = &p->pc;
67 // mb_addr= pc->mb_addr - 1;
68  state = pc->state;
69  if (state > 13)
70  state = 7;
71 
72  for (i = 0; i < buf_size; i++) {
73  if (state == 7) {
74  i += p->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
75  if (i < buf_size)
76  state = 2;
77  } else if (state <= 2) {
78  if (buf[i] == 1)
79  state ^= 5; // 2->7, 1->4, 0->5
80  else if (buf[i])
81  state = 7;
82  else
83  state >>= 1; // 2->1, 1->0, 0->0
84  } else if (state <= 5) {
85  int nalu_type = buf[i] & 0x1F;
86  if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
87  nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
88  if (pc->frame_start_found) {
89  i++;
90  goto found;
91  }
92  } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
93  nalu_type == H264_NAL_IDR_SLICE) {
94  if (pc->frame_start_found) {
95  state += 8;
96  continue;
97  } else
98  pc->frame_start_found = 1;
99  }
100  state = 7;
101  } else {
102  // first_mb_in_slice is 0, probably the first nal of a new slice
103  if (buf[i] & 0x80)
104  goto found;
105  state = 7;
106  }
107  }
108  pc->state = state;
109  return END_NOT_FOUND;
110 
111 found:
112  pc->state = 7;
113  pc->frame_start_found = 0;
114  return i - (state & 5);
115 }
116 
118  AVCodecContext *avctx)
119 {
121  int slice_type_nos = s->pict_type & 3;
122  H264ParseContext *p = s->priv_data;
123  int list_count, ref_count[2];
124 
125 
127  get_ue_golomb(gb); // redundant_pic_count
128 
129  if (slice_type_nos == AV_PICTURE_TYPE_B)
130  get_bits1(gb); // direct_spatial_mv_pred
131 
132  if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
133  slice_type_nos, p->picture_structure) < 0)
134  return AVERROR_INVALIDDATA;
135 
136  if (slice_type_nos != AV_PICTURE_TYPE_I) {
137  int list;
138  for (list = 0; list < list_count; list++) {
139  if (get_bits1(gb)) {
140  int index;
141  for (index = 0; ; index++) {
142  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
143 
144  if (reordering_of_pic_nums_idc < 3)
145  get_ue_golomb(gb);
146  else if (reordering_of_pic_nums_idc > 3) {
147  av_log(avctx, AV_LOG_ERROR,
148  "illegal reordering_of_pic_nums_idc %d\n",
149  reordering_of_pic_nums_idc);
150  return AVERROR_INVALIDDATA;
151  } else
152  break;
153 
154  if (index >= ref_count[list]) {
155  av_log(avctx, AV_LOG_ERROR,
156  "reference count %d overflow\n", index);
157  return AVERROR_INVALIDDATA;
158  }
159  }
160  }
161  }
162  }
163 
164  if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
165  (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
166  ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
167  &pwt);
168 
169  if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
170  int i;
171  for (i = 0; i < MAX_MMCO_COUNT; i++) {
172  MMCOOpcode opcode = get_ue_golomb_31(gb);
173  if (opcode > (unsigned) MMCO_LONG) {
174  av_log(avctx, AV_LOG_ERROR,
175  "illegal memory management control operation %d\n",
176  opcode);
177  return AVERROR_INVALIDDATA;
178  }
179  if (opcode == MMCO_END)
180  return 0;
181  else if (opcode == MMCO_RESET)
182  return 1;
183 
184  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
185  get_ue_golomb(gb);
186  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
187  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
188  get_ue_golomb_31(gb);
189  }
190  }
191 
192  return 0;
193 }
194 
204  AVCodecContext *avctx,
205  const uint8_t *buf, int buf_size)
206 {
207  H264ParseContext *p = s->priv_data;
208  const uint8_t *buf_end = buf + buf_size;
209 
210  H2645NAL nal = { NULL };
211 
212  unsigned int pps_id;
213  unsigned int slice_type;
214  int state = -1, got_reset = 0;
215  int field_poc[2];
216  int ret;
217 
218  /* set some sane default values */
220  s->key_frame = 0;
222 
223  ff_h264_sei_uninit(&p->sei);
224 
225  if (!buf_size)
226  return 0;
227 
228  for (;;) {
229  const SPS *sps;
230  int src_length, consumed;
231  buf = avpriv_find_start_code(buf, buf_end, &state);
232  if (buf >= buf_end)
233  break;
234  --buf;
235  src_length = buf_end - buf;
236  switch (state & 0x1f) {
237  case H264_NAL_SLICE:
238  case H264_NAL_IDR_SLICE:
239  // Do not walk the whole buffer just to decode slice header
240  if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
241  /* IDR or disposable slice
242  * No need to decode many bytes because MMCOs shall not be present. */
243  if (src_length > 60)
244  src_length = 60;
245  } else {
246  /* To decode up to MMCOs */
247  if (src_length > 1000)
248  src_length = 1000;
249  }
250  break;
251  }
252 
253  consumed = ff_h2645_extract_rbsp(buf, src_length, &nal);
254  if (consumed < 0)
255  break;
256 
257  ret = init_get_bits(&nal.gb, nal.data, nal.size * 8);
258  if (ret < 0)
259  goto fail;
260  get_bits1(&nal.gb);
261  nal.ref_idc = get_bits(&nal.gb, 2);
262  nal.type = get_bits(&nal.gb, 5);
263 
264  switch (nal.type) {
265  case H264_NAL_SPS:
266  ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps);
267  break;
268  case H264_NAL_PPS:
269  ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
270  nal.size_bits);
271  break;
272  case H264_NAL_SEI:
273  ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
274  break;
275  case H264_NAL_IDR_SLICE:
276  s->key_frame = 1;
277 
278  p->poc.prev_frame_num = 0;
279  p->poc.prev_frame_num_offset = 0;
280  p->poc.prev_poc_msb =
281  p->poc.prev_poc_lsb = 0;
282  /* fall through */
283  case H264_NAL_SLICE:
284  get_ue_golomb(&nal.gb); // skip first_mb_in_slice
285  slice_type = get_ue_golomb_31(&nal.gb);
286  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
287  if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
288  /* key frame, since recovery_frame_cnt is set */
289  s->key_frame = 1;
290  }
291  pps_id = get_ue_golomb(&nal.gb);
292  if (pps_id >= MAX_PPS_COUNT) {
293  av_log(avctx, AV_LOG_ERROR,
294  "pps_id %u out of range\n", pps_id);
295  goto fail;
296  }
297  if (!p->ps.pps_list[pps_id]) {
298  av_log(avctx, AV_LOG_ERROR,
299  "non-existing PPS %u referenced\n", pps_id);
300  goto fail;
301  }
302  p->ps.pps = (const PPS*)p->ps.pps_list[pps_id]->data;
303  if (!p->ps.sps_list[p->ps.pps->sps_id]) {
304  av_log(avctx, AV_LOG_ERROR,
305  "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
306  goto fail;
307  }
308  p->ps.sps = (SPS*)p->ps.sps_list[p->ps.pps->sps_id]->data;
309 
310  sps = p->ps.sps;
311 
312  p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
313 
314  s->coded_width = 16 * sps->mb_width;
315  s->coded_height = 16 * sps->mb_height;
316  s->width = s->coded_width - (sps->crop_right + sps->crop_left);
317  s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
318  if (s->width <= 0 || s->height <= 0) {
319  s->width = s->coded_width;
320  s->height = s->coded_height;
321  }
322 
323  switch (sps->bit_depth_luma) {
324  case 9:
325  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
326  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
327  else s->format = AV_PIX_FMT_YUV420P9;
328  break;
329  case 10:
330  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
331  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
332  else s->format = AV_PIX_FMT_YUV420P10;
333  break;
334  case 8:
335  if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
336  else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
337  else s->format = AV_PIX_FMT_YUV420P;
338  break;
339  default:
340  s->format = AV_PIX_FMT_NONE;
341  }
342 
343  avctx->profile = ff_h264_get_profile(sps);
344  avctx->level = sps->level_idc;
345 
346  if (sps->frame_mbs_only_flag) {
348  } else {
349  if (get_bits1(&nal.gb)) { // field_pic_flag
350  p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
351  } else {
353  }
354  }
355 
356  if (nal.type == H264_NAL_IDR_SLICE)
357  get_ue_golomb(&nal.gb); /* idr_pic_id */
358  if (sps->poc_type == 0) {
359  p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
360 
361  if (p->ps.pps->pic_order_present == 1 &&
364  }
365 
366  if (sps->poc_type == 1 &&
368  p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
369 
370  if (p->ps.pps->pic_order_present == 1 &&
372  p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
373  }
374 
375  /* Decode POC of this picture.
376  * The prev_ values needed for decoding POC of the next picture are not set here. */
377  field_poc[0] = field_poc[1] = INT_MAX;
378  ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
379  &p->poc, p->picture_structure, nal.ref_idc);
380 
381  /* Continue parsing to check if MMCO_RESET is present.
382  * FIXME: MMCO_RESET could appear in non-first slice.
383  * Maybe, we should parse all undisposable non-IDR slice of this
384  * picture until encountering MMCO_RESET in a slice of it. */
385  if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
386  got_reset = scan_mmco_reset(s, &nal.gb, avctx);
387  if (got_reset < 0)
388  goto fail;
389  }
390 
391  /* Set up the prev_ values for decoding POC of the next picture. */
392  p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
393  p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
394  if (nal.ref_idc != 0) {
395  if (!got_reset) {
396  p->poc.prev_poc_msb = p->poc.poc_msb;
397  p->poc.prev_poc_lsb = p->poc.poc_lsb;
398  } else {
399  p->poc.prev_poc_msb = 0;
400  p->poc.prev_poc_lsb =
401  p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
402  }
403  }
404 
405  if (sps->pic_struct_present_flag) {
406  switch (p->sei.picture_timing.pic_struct) {
409  s->repeat_pict = 0;
410  break;
414  s->repeat_pict = 1;
415  break;
418  s->repeat_pict = 2;
419  break;
421  s->repeat_pict = 3;
422  break;
424  s->repeat_pict = 5;
425  break;
426  default:
427  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
428  break;
429  }
430  } else {
431  s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
432  }
433 
434  if (p->picture_structure == PICT_FRAME) {
436  if (sps->pic_struct_present_flag) {
437  switch (p->sei.picture_timing.pic_struct) {
441  break;
445  break;
446  default:
448  break;
449  }
450  } else {
451  if (field_poc[0] < field_poc[1])
453  else if (field_poc[0] > field_poc[1])
455  else
457  }
458  } else {
461  else
464  }
465 
466  av_freep(&nal.rbsp_buffer);
467  return 0; /* no need to evaluate the rest */
468  }
469  buf += consumed;
470  }
471  /* didn't find a picture! */
472  av_log(avctx, AV_LOG_ERROR, "missing picture in access unit\n");
473 fail:
474  av_freep(&nal.rbsp_buffer);
475  return -1;
476 }
477 
479  AVCodecContext *avctx,
480  const uint8_t **poutbuf, int *poutbuf_size,
481  const uint8_t *buf, int buf_size)
482 {
483  H264ParseContext *p = s->priv_data;
484  ParseContext *pc = &p->pc;
485  int next;
486 
487  if (!p->got_first) {
488  p->got_first = 1;
489  if (avctx->extradata_size) {
491  &p->ps, &p->is_avc, &p->nal_length_size,
492  avctx->err_recognition, avctx);
493  }
494  }
495 
497  next = buf_size;
498  } else {
499  next = h264_find_frame_end(p, buf, buf_size);
500 
501  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
502  *poutbuf = NULL;
503  *poutbuf_size = 0;
504  return buf_size;
505  }
506 
507  if (next < 0 && next != END_NOT_FOUND) {
508  assert(pc->last_index + next >= 0);
509  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
510  }
511  }
512 
513  parse_nal_units(s, avctx, buf, buf_size);
514 
515  if (p->sei.picture_timing.cpb_removal_delay >= 0) {
519  } else {
520  s->dts_sync_point = INT_MIN;
521  s->dts_ref_dts_delta = INT_MIN;
522  s->pts_dts_delta = INT_MIN;
523  }
524 
525  if (s->flags & PARSER_FLAG_ONCE) {
527  }
528 
529  *poutbuf = buf;
530  *poutbuf_size = buf_size;
531  return next;
532 }
533 
534 static int h264_split(AVCodecContext *avctx,
535  const uint8_t *buf, int buf_size)
536 {
537  int i;
538  uint32_t state = -1;
539  int has_sps = 0;
540 
541  for (i = 0; i <= buf_size; i++) {
542  if ((state & 0xFFFFFF1F) == 0x107)
543  has_sps = 1;
544  /* if((state&0xFFFFFF1F) == 0x101 ||
545  * (state&0xFFFFFF1F) == 0x102 ||
546  * (state&0xFFFFFF1F) == 0x105) {
547  * }
548  */
549  if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
550  (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
551  (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
552  (state & 0xFFFFFF1F) != 0x10f) {
553  if (has_sps) {
554  while (i > 4 && buf[i - 5] == 0)
555  i--;
556  return i - 4;
557  }
558  }
559  if (i < buf_size)
560  state = (state << 8) | buf[i];
561  }
562  return 0;
563 }
564 
566 {
567  H264ParseContext *p = s->priv_data;
568  ParseContext *pc = &p->pc;
569  int i;
570 
571  av_free(pc->buffer);
572 
573  ff_h264_sei_uninit(&p->sei);
574 
575  for (i = 0; i < FF_ARRAY_ELEMS(p->ps.sps_list); i++)
576  av_buffer_unref(&p->ps.sps_list[i]);
577 
578  for (i = 0; i < FF_ARRAY_ELEMS(p->ps.pps_list); i++)
579  av_buffer_unref(&p->ps.pps_list[i]);
580 }
581 
583 {
584  H264ParseContext *p = s->priv_data;
585 
586  ff_h264dsp_init(&p->h264dsp, 8, 1);
587  return 0;
588 }
589 
592  .priv_data_size = sizeof(H264ParseContext),
593  .parser_init = init,
594  .parser_parse = h264_parse,
595  .parser_close = h264_close,
596  .split = h264_split,
597 };
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:672
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
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:106
int recovery_frame_cnt
recovery_frame_cnt
Definition: h264_sei.h:95
int size
Definition: h2645_parse.h:33
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:179
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:64
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:228
int weighted_bipred_idc
Definition: h264_ps.h:114
memory handling functions
AVBufferRef * sps_list[MAX_SPS_COUNT]
Definition: h264_ps.h:134
ParseContext pc
Definition: h264_parser.c:49
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:4508
Sequence parameter set.
Definition: h264_ps.h:43
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt)
Definition: h264_parse.c:27
enum AVFieldOrder field_order
Definition: avcodec.h:4485
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
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:240
int codec_ids[5]
Definition: avcodec.h:4529
Picture parameter set.
Definition: h264_ps.h:106
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:4514
external API header
int frame_mbs_only_flag
Definition: h264_ps.h:61
3: top field, bottom field, in that order
Definition: h264_sei.h:44
void ff_h264_sei_uninit(H264SEIContext *h)
Reset SEI values at the beginning of the frame.
Definition: h264_sei.c:39
#define FF_ARRAY_ELEMS(a)
H264DSPContext h264dsp
Definition: h264_parser.c:51
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:4445
8: frame tripling
Definition: h264_sei.h:49
int profile
profile
Definition: avcodec.h:2880
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
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264_ps.h:69
const PPS * pps
Definition: h264_ps.h:138
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:4495
uint8_t
#define av_cold
Definition: attributes.h:66
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264_ps.h:67
int frame_num_offset
for POC type 2
Definition: h264_parse.h:51
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264_ps.h:68
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1523
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:406
#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:120
bitstream reader API header.
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, AVCodecContext *avctx)
Definition: h264_parser.c:117
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: h264dsp.h:116
7: frame doubling
Definition: h264_sei.h:48
H.264 common definitions.
H.264 parameter set handling.
H264POCContext poc
Definition: h264_parser.c:52
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
static int get_ue_golomb(GetBitContext *gb)
read unsigned exp golomb code.
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: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:227
int ff_h264_get_profile(const SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264_parse.c:470
int present
Buffering period SEI flag.
Definition: h264_sei.h:99
int weighted_pred
weighted_pred_flag
Definition: h264_ps.h:113
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:265
const uint8_t ff_h264_golomb_to_pict_type[5]
Definition: h264data.c:37
MMCOOpcode
Memory management control operation opcode.
Definition: h264dec.h:108
#define fail()
Definition: checkasm.h:80
int delta_pic_order_always_zero_flag
Definition: h264_ps.h:52
static char * split(char *message, char delim)
Definition: af_channelmap.c:85
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:63
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:261
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:41
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2670
int last_index
Definition: parser.h:31
static int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Parse NAL units of found picture and decode some basic information.
Definition: h264_parser.c:203
int level
level
Definition: avcodec.h:2970
int cpb_removal_delay
cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
Definition: h264_sei.h:70
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:61
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:60
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:262
int type
NAL unit type.
Definition: h2645_parse.h:50
2: bottom field
Definition: h264_sei.h:43
AVCodecParser ff_h264_parser
Definition: h264_parser.c:590
if(ac->has_optimized_func)
int pic_order_present
pic_order_present_flag
Definition: h264_ps.h:109
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:565
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:4459
NULL
Definition: eval.c:55
uint8_t * buffer
Definition: parser.h:29
Libavcodec external API header.
AVBufferRef * pps_list[MAX_PPS_COUNT]
Definition: h264_ps.h:135
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:96
int delta_poc_bottom
Definition: h264_parse.h:46
SEI_PicStructType pic_struct
Definition: h264_sei.h:53
main external API structure.
Definition: avcodec.h:1409
H264SEIContext sei
Definition: h264_parser.c:53
uint8_t * data
The data buffer.
Definition: buffer.h:89
const uint8_t * data
Definition: h2645_parse.h:34
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
int extradata_size
Definition: avcodec.h:1524
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:267
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:263
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:534
int index
Definition: gxfenc.c:72
5: top field, bottom field, top field repeated, in that order
Definition: h264_sei.h:46
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:362
H264SEIBufferingPeriod buffering_period
Definition: h264_sei.h:122
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:260
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264_ps.h:107
H264SEIPictureTiming picture_timing
Definition: h264_sei.h:117
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:51
H264SEIRecoveryPoint recovery_point
Definition: h264_sei.h:121
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:4503
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:264
int pic_struct_present_flag
Definition: h264_ps.h:91
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
const uint8_t * avpriv_find_start_code(const uint8_t *restrict p, const uint8_t *end, uint32_t *restrict state)
Definition: utils.c:2707
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4397
int mb_height
Definition: h264_ps.h:60
static struct @174 state
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:59
common internal api header.
int dpb_output_delay
dpb_output_delay in picture timing SEI message, see H.264 C.2.2
Definition: h264_sei.h:65
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:49
Bi-dir predicted.
Definition: avutil.h:262
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4396
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
GetBitContext gb
Definition: h2645_parse.h:45
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264_ps.h:97
int delta_poc[2]
Definition: h264_parse.h:47
#define PICT_FRAME
Definition: mpegutils.h:39
4: bottom field, top field, in that order
Definition: h264_sei.h:45
pixel format definitions
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:4525
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264_ps.h:58
SPS * sps
Definition: h264_ps.h:140
av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
Definition: h264dsp.c:57
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4380
1: top field
Definition: h264_sei.h:42
uint8_t * rbsp_buffer
Definition: h2645_parse.h:30
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx)
Definition: h264_sei.c:346
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:52
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:478
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264_ps.h:70
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4410
int level_idc
Definition: h264_ps.h:46
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)
Definition: h264_parse.c:191
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:4430
6: bottom field, top field, bottom field repeated, in that order
Definition: h264_sei.h:47
Predicted.
Definition: avutil.h:261
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps)
Decode SPS.
Definition: h264_ps.c:324
#define MAX_MMCO_COUNT
Definition: h264dec.h:54