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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 <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 "h264data.h"
43 #include "internal.h"
44 #include "mpegutils.h"
45 #include "parser.h"
46 
47 typedef struct H264ParseContext {
50  int got_first;
52 
53 
55  int buf_size)
56 {
57  H264Context *h = &p->h;
58  int i, j;
59  uint32_t state;
60  ParseContext *pc = &p->pc;
61 
62  int next_avc= h->is_avc ? 0 : buf_size;
63 // mb_addr= pc->mb_addr - 1;
64  state = pc->state;
65  if (state > 13)
66  state = 7;
67 
68  if (h->is_avc && !h->nal_length_size)
69  av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
70 
71  for (i = 0; i < buf_size; i++) {
72  if (i >= next_avc) {
73  int nalsize = 0;
74  i = next_avc;
75  for (j = 0; j < h->nal_length_size; j++)
76  nalsize = (nalsize << 8) | buf[i++];
77  if (nalsize <= 0 || nalsize > buf_size - i) {
78  av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
79  return buf_size;
80  }
81  next_avc = i + nalsize;
82  state = 5;
83  }
84 
85  if (state == 7) {
86  i += h->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
87  if (i < next_avc)
88  state = 2;
89  } else if (state <= 2) {
90  if (buf[i] == 1)
91  state ^= 5; // 2->7, 1->4, 0->5
92  else if (buf[i])
93  state = 7;
94  else
95  state >>= 1; // 2->1, 1->0, 0->0
96  } else if (state <= 5) {
97  int nalu_type = buf[i] & 0x1F;
98  if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
99  nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
100  if (pc->frame_start_found) {
101  i++;
102  goto found;
103  }
104  } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
105  nalu_type == NAL_IDR_SLICE) {
106  state += 8;
107  continue;
108  }
109  state = 7;
110  } else {
111  h->parse_history[h->parse_history_count++]= buf[i];
112  if (h->parse_history_count>5) {
113  unsigned int mb, last_mb= h->parse_last_mb;
114  GetBitContext gb;
115 
117  h->parse_history_count=0;
118  mb= get_ue_golomb_long(&gb);
119  h->parse_last_mb= mb;
120  if (pc->frame_start_found) {
121  if (mb <= last_mb)
122  goto found;
123  } else
124  pc->frame_start_found = 1;
125  state = 7;
126  }
127  }
128  }
129  pc->state = state;
130  if (h->is_avc)
131  return next_avc;
132  return END_NOT_FOUND;
133 
134 found:
135  pc->state = 7;
136  pc->frame_start_found = 0;
137  if (h->is_avc)
138  return next_avc;
139  return i - (state & 5) - 5 * (state > 7);
140 }
141 
143 {
144  H264ParseContext *p = s->priv_data;
145  H264Context *h = &p->h;
146  H264SliceContext *sl = &h->slice_ctx[0];
147 
148  sl->slice_type_nos = s->pict_type & 3;
149 
151  get_ue_golomb(&sl->gb); // redundant_pic_count
152 
153  if (ff_set_ref_count(h, sl) < 0)
154  return AVERROR_INVALIDDATA;
155 
156  if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
157  int list;
158  for (list = 0; list < sl->list_count; list++) {
159  if (get_bits1(&sl->gb)) {
160  int index;
161  for (index = 0; ; index++) {
162  unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
163 
164  if (reordering_of_pic_nums_idc < 3)
165  get_ue_golomb_long(&sl->gb);
166  else if (reordering_of_pic_nums_idc > 3) {
168  "illegal reordering_of_pic_nums_idc %d\n",
169  reordering_of_pic_nums_idc);
170  return AVERROR_INVALIDDATA;
171  } else
172  break;
173 
174  if (index >= sl->ref_count[list]) {
176  "reference count %d overflow\n", index);
177  return AVERROR_INVALIDDATA;
178  }
179  }
180  }
181  }
182  }
183 
184  if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
187  &sl->pwt);
188 
189  if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
190  int i;
191  for (i = 0; i < MAX_MMCO_COUNT; i++) {
192  MMCOOpcode opcode = get_ue_golomb_31(&sl->gb);
193  if (opcode > (unsigned) MMCO_LONG) {
195  "illegal memory management control operation %d\n",
196  opcode);
197  return AVERROR_INVALIDDATA;
198  }
199  if (opcode == MMCO_END)
200  return 0;
201  else if (opcode == MMCO_RESET)
202  return 1;
203 
204  if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
205  get_ue_golomb_long(&sl->gb); // difference_of_pic_nums_minus1
206  if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
207  opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
208  get_ue_golomb_31(&sl->gb);
209  }
210  }
211 
212  return 0;
213 }
214 
215 /**
216  * Parse NAL units of found picture and decode some basic information.
217  *
218  * @param s parser context.
219  * @param avctx codec context.
220  * @param buf buffer with field/frame data.
221  * @param buf_size size of the buffer.
222  */
224  AVCodecContext *avctx,
225  const uint8_t * const buf, int buf_size)
226 {
227  H264ParseContext *p = s->priv_data;
228  H264Context *h = &p->h;
229  H264SliceContext *sl = &h->slice_ctx[0];
230  int buf_index, next_avc;
231  unsigned int pps_id;
232  unsigned int slice_type;
233  int state = -1, got_reset = 0;
234  const uint8_t *ptr;
235  int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
236  int field_poc[2];
237 
238  /* set some sane default values */
240  s->key_frame = 0;
242 
243  h->avctx = avctx;
246 
247  if (!buf_size)
248  return 0;
249 
250  buf_index = 0;
251  next_avc = h->is_avc ? 0 : buf_size;
252  for (;;) {
253  int src_length, dst_length, consumed, nalsize = 0;
254 
255  if (buf_index >= next_avc) {
256  nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index);
257  if (nalsize < 0)
258  break;
259  next_avc = buf_index + nalsize;
260  } else {
261  buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
262  if (buf_index >= buf_size)
263  break;
264  if (buf_index >= next_avc)
265  continue;
266  }
267  src_length = next_avc - buf_index;
268 
269  state = buf[buf_index];
270  switch (state & 0x1f) {
271  case NAL_SLICE:
272  case NAL_IDR_SLICE:
273  // Do not walk the whole buffer just to decode slice header
274  if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
275  /* IDR or disposable slice
276  * No need to decode many bytes because MMCOs shall not be present. */
277  if (src_length > 60)
278  src_length = 60;
279  } else {
280  /* To decode up to MMCOs */
281  if (src_length > 1000)
282  src_length = 1000;
283  }
284  break;
285  }
286  ptr = ff_h264_decode_nal(h, sl, buf + buf_index, &dst_length,
287  &consumed, src_length);
288  if (!ptr || dst_length < 0)
289  break;
290 
291  buf_index += consumed;
292 
293  init_get_bits(&h->gb, ptr, 8 * dst_length);
294  switch (h->nal_unit_type) {
295  case NAL_SPS:
297  break;
298  case NAL_PPS:
300  break;
301  case NAL_SEI:
303  break;
304  case NAL_IDR_SLICE:
305  s->key_frame = 1;
306 
307  h->prev_frame_num = 0;
308  h->prev_frame_num_offset = 0;
309  h->prev_poc_msb =
310  h->prev_poc_lsb = 0;
311  /* fall through */
312  case NAL_SLICE:
313  init_get_bits(&sl->gb, ptr, 8 * dst_length);
314  get_ue_golomb_long(&sl->gb); // skip first_mb_in_slice
315  slice_type = get_ue_golomb_31(&sl->gb);
316  s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
317  if (h->sei_recovery_frame_cnt >= 0) {
318  /* key frame, since recovery_frame_cnt is set */
319  s->key_frame = 1;
320  }
321  pps_id = get_ue_golomb(&sl->gb);
322  if (pps_id >= MAX_PPS_COUNT) {
324  "pps_id %u out of range\n", pps_id);
325  return -1;
326  }
327  if (!h->pps_buffers[pps_id]) {
329  "non-existing PPS %u referenced\n", pps_id);
330  return -1;
331  }
332  h->pps = *h->pps_buffers[pps_id];
333  if (!h->sps_buffers[h->pps.sps_id]) {
335  "non-existing SPS %u referenced\n", h->pps.sps_id);
336  return -1;
337  }
338  h->sps = *h->sps_buffers[h->pps.sps_id];
339  h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
340 
341  if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
342  s->key_frame = 1;
343 
344  s->coded_width = 16 * h->sps.mb_width;
345  s->coded_height = 16 * h->sps.mb_height;
346  s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
347  s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
348  if (s->width <= 0 || s->height <= 0) {
349  s->width = s->coded_width;
350  s->height = s->coded_height;
351  }
352 
353  switch (h->sps.bit_depth_luma) {
354  case 9:
355  if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
356  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
357  else s->format = AV_PIX_FMT_YUV420P9;
358  break;
359  case 10:
361  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
362  else s->format = AV_PIX_FMT_YUV420P10;
363  break;
364  case 8:
366  else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
367  else s->format = AV_PIX_FMT_YUV420P;
368  break;
369  default:
370  s->format = AV_PIX_FMT_NONE;
371  }
372 
373  avctx->profile = ff_h264_get_profile(&h->sps);
374  avctx->level = h->sps.level_idc;
375 
376  if (h->sps.frame_mbs_only_flag) {
378  } else {
379  if (get_bits1(&sl->gb)) { // field_pic_flag
380  h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
381  } else {
383  }
384  }
385 
386  if (h->nal_unit_type == NAL_IDR_SLICE)
387  get_ue_golomb_long(&sl->gb); /* idr_pic_id */
388  if (h->sps.poc_type == 0) {
389  h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
390 
391  if (h->pps.pic_order_present == 1 &&
393  h->delta_poc_bottom = get_se_golomb(&sl->gb);
394  }
395 
396  if (h->sps.poc_type == 1 &&
398  h->delta_poc[0] = get_se_golomb(&sl->gb);
399 
400  if (h->pps.pic_order_present == 1 &&
402  h->delta_poc[1] = get_se_golomb(&sl->gb);
403  }
404 
405  /* Decode POC of this picture.
406  * The prev_ values needed for decoding POC of the next picture are not set here. */
407  field_poc[0] = field_poc[1] = INT_MAX;
408  ff_init_poc(h, field_poc, &s->output_picture_number);
409 
410  /* Continue parsing to check if MMCO_RESET is present.
411  * FIXME: MMCO_RESET could appear in non-first slice.
412  * Maybe, we should parse all undisposable non-IDR slice of this
413  * picture until encountering MMCO_RESET in a slice of it. */
414  if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
415  got_reset = scan_mmco_reset(s);
416  if (got_reset < 0)
417  return got_reset;
418  }
419 
420  /* Set up the prev_ values for decoding POC of the next picture. */
421  h->prev_frame_num = got_reset ? 0 : h->frame_num;
422  h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
423  if (h->nal_ref_idc != 0) {
424  if (!got_reset) {
425  h->prev_poc_msb = h->poc_msb;
426  h->prev_poc_lsb = h->poc_lsb;
427  } else {
428  h->prev_poc_msb = 0;
429  h->prev_poc_lsb =
430  h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
431  }
432  }
433 
434  if (h->sps.pic_struct_present_flag) {
435  switch (h->sei_pic_struct) {
438  s->repeat_pict = 0;
439  break;
443  s->repeat_pict = 1;
444  break;
447  s->repeat_pict = 2;
448  break;
450  s->repeat_pict = 3;
451  break;
453  s->repeat_pict = 5;
454  break;
455  default:
456  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
457  break;
458  }
459  } else {
460  s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
461  }
462 
463  if (h->picture_structure == PICT_FRAME) {
465  if (h->sps.pic_struct_present_flag) {
466  switch (h->sei_pic_struct) {
470  break;
474  break;
475  default:
477  break;
478  }
479  } else {
480  if (field_poc[0] < field_poc[1])
482  else if (field_poc[0] > field_poc[1])
484  else
486  }
487  } else {
490  else
493  }
494 
495  return 0; /* no need to evaluate the rest */
496  }
497  }
498  if (q264)
499  return 0;
500  /* didn't find a picture! */
501  av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
502  return -1;
503 }
504 
506  AVCodecContext *avctx,
507  const uint8_t **poutbuf, int *poutbuf_size,
508  const uint8_t *buf, int buf_size)
509 {
510  H264ParseContext *p = s->priv_data;
511  H264Context *h = &p->h;
512  ParseContext *pc = &p->pc;
513  int next;
514 
515  if (!p->got_first) {
516  p->got_first = 1;
517  if (avctx->extradata_size) {
518  h->avctx = avctx;
519  // must be done like in decoder, otherwise opening the parser,
520  // letting it create extradata and then closing and opening again
521  // will cause has_b_frames to be always set.
522  // Note that estimate_timings_from_pts does exactly this.
523  if (!avctx->has_b_frames)
524  h->low_delay = 1;
526  }
527  }
528 
530  next = buf_size;
531  } else {
532  next = h264_find_frame_end(p, buf, buf_size);
533 
534  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
535  *poutbuf = NULL;
536  *poutbuf_size = 0;
537  return buf_size;
538  }
539 
540  if (next < 0 && next != END_NOT_FOUND) {
541  av_assert1(pc->last_index + next >= 0);
542  h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
543  }
544  }
545 
546  parse_nal_units(s, avctx, buf, buf_size);
547 
548  if (avctx->framerate.num)
549  avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
550  if (h->sei_cpb_removal_delay >= 0) {
551  s->dts_sync_point = h->sei_buffering_period_present;
552  s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
553  s->pts_dts_delta = h->sei_dpb_output_delay;
554  } else {
555  s->dts_sync_point = INT_MIN;
556  s->dts_ref_dts_delta = INT_MIN;
557  s->pts_dts_delta = INT_MIN;
558  }
559 
560  if (s->flags & PARSER_FLAG_ONCE) {
561  s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
562  }
563 
564  *poutbuf = buf;
565  *poutbuf_size = buf_size;
566  return next;
567 }
568 
569 static int h264_split(AVCodecContext *avctx,
570  const uint8_t *buf, int buf_size)
571 {
572  uint32_t state = -1;
573  int has_sps = 0;
574  int has_pps = 0;
575  const uint8_t *ptr = buf, *end = buf + buf_size;
576  int nalu_type;
577 
578  while (ptr < end) {
579  ptr = avpriv_find_start_code(ptr, end, &state);
580  if ((state & 0xFFFFFF00) != 0x100)
581  break;
582  nalu_type = state & 0x1F;
583  if (nalu_type == NAL_SPS) {
584  has_sps = 1;
585  } else if (nalu_type == NAL_PPS)
586  has_pps = 1;
587  /* else if (nalu_type == 0x01 ||
588  * nalu_type == 0x02 ||
589  * nalu_type == 0x05) {
590  * }
591  */
592  else if ((nalu_type != NAL_SEI || has_pps) &&
593  nalu_type != NAL_AUD && nalu_type != NAL_SPS_EXT &&
594  nalu_type != 0x0f) {
595  if (has_sps) {
596  while (ptr - 4 > buf && ptr[-5] == 0)
597  ptr--;
598  return ptr - 4 - buf;
599  }
600  }
601  }
602 
603  return 0;
604 }
605 
607 {
608  H264ParseContext *p = s->priv_data;
609  H264Context *h = &p->h;
610  ParseContext *pc = &p->pc;
611 
612  av_freep(&pc->buffer);
614 }
615 
617 {
618  H264ParseContext *p = s->priv_data;
619  H264Context *h = &p->h;
620 
621  h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
622  if (!h->slice_ctx)
623  return 0;
624  h->nb_slice_ctx = 1;
625 
626  h->slice_context_count = 1;
627  ff_h264dsp_init(&h->h264dsp, 8, 1);
628  return 0;
629 }
630 
633  .priv_data_size = sizeof(H264ParseContext),
634  .parser_init = init,
635  .parser_parse = h264_parse,
636  .parser_close = h264_close,
637  .split = h264_split,
638 };
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:3327
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:520
5: top field, bottom field, top field repeated, in that order
Definition: h264.h:154
int low_delay
Definition: h264.h:546
uint8_t parse_history[6]
Definition: h264.h:818
int delta_poc[2]
Definition: h264.h:645
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
#define CHROMA444(h)
Definition: h264.h:101
Definition: h264.h:121
3: top field, bottom field, in that order
Definition: h264.h:152
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:260
int weighted_bipred_idc
Definition: h264.h:249
memory handling functions
ParseContext pc
Definition: h264_parser.c:49
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:135
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5050
7: frame doubling
Definition: h264.h:156
#define MAX_PPS_COUNT
Definition: h264.h:52
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:24
enum AVFieldOrder field_order
Definition: avcodec.h:5027
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:247
int num
numerator
Definition: rational.h:44
static int scan_mmco_reset(AVCodecParserContext *s)
Definition: h264_parser.c:142
int codec_ids[5]
Definition: avcodec.h:5071
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5056
external API header
int frame_mbs_only_flag
Definition: h264.h:193
int is_avc
Used to parse AVC variant of h264.
Definition: h264.h:628
MMCOOpcode
Memory management control operation opcode.
Definition: h264.h:296
int ff_h264_get_profile(SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264.c:1058
H264Context.
Definition: h264.h:513
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264.h:647
4: bottom field, top field, in that order
Definition: h264.h:153
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:223
int profile
profile
Definition: avcodec.h:3143
int frame_start_found
Definition: parser.h:34
int picture_structure
Definition: h264.h:586
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:456
int ff_set_ref_count(H264Context *h, H264SliceContext *sl)
Definition: h264.c:1078
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1776
unsigned int crop_top
frame_cropping_rect_top_offset
Definition: h264.h:201
int parse_history_count
Definition: h264.h:819
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5037
H264Context h
Definition: h264_parser.c:48
uint8_t
#define av_cold
Definition: attributes.h:82
int prev_frame_num_offset
for POC type 2
Definition: h264.h:650
#define mb
unsigned int crop_left
frame_cropping_rect_left_offset
Definition: h264.h:199
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:1155
Definition: h264.h:115
unsigned int crop_right
frame_cropping_rect_right_offset
Definition: h264.h:200
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1754
#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:255
bitstream reader API header.
#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 / MPEG4 part10 codec.
Definition: h264.h:122
int frame_num
Definition: h264.h:646
#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:1961
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:183
int nal_unit_type
Definition: h264.h:623
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_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
Definition: h264.c:973
int parse_last_mb
Definition: h264.h:820
PPS pps
current pps
Definition: h264.h:573
0: frame
Definition: h264.h:149
int weighted_pred
weighted_pred_flag
Definition: h264.h:248
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:341
const uint8_t ff_h264_golomb_to_pict_type[5]
Definition: h264data.c:36
int delta_pic_order_always_zero_flag
Definition: h264.h:185
int slice_type_nos
S free slice type (SI/SP are remapped to I/P)
Definition: h264.h:375
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 nal_length_size
Number of bytes used for nal length (1, 2 or 4)
Definition: h264.h:629
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:336
int ref_frame_count
num_ref_frames
Definition: h264.h:189
int frame_num_offset
for POC type 2
Definition: h264.h:649
FPA sei_fpa
Definition: h264.h:777
#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:528
H264PredWeightTable pwt
Definition: h264.h:388
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 size_in_bits
Definition: get_bits.h:57
SPS sps
current sps
Definition: h264.h:572
PPS * pps_buffers[MAX_PPS_COUNT]
Definition: h264.h:635
int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
Decode PPS.
Definition: h264_ps.c:631
int level
level
Definition: avcodec.h:3232
H264SliceContext * slice_ctx
Definition: h264.h:527
int poc_lsb
Definition: h264.h:642
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1785
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:54
Definition: h264.h:120
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:337
AVCodecParser ff_h264_parser
Definition: h264_parser.c:631
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:244
SPS * sps_buffers[MAX_SPS_COUNT]
Definition: h264.h:634
static void h264_close(AVCodecParserContext *s)
Definition: h264_parser.c:606
AVCodecContext * avctx
Definition: h264.h:515
uint8_t * buffer
Definition: parser.h:29
1: top field
Definition: h264.h:150
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:651
int ff_h264_decode_sei(H264Context *h)
Decode SEI.
Definition: h264_sei.c:421
int poc_msb
Definition: h264.h:643
main external API structure.
Definition: avcodec.h:1639
Definition: h264.h:297
2: bottom field
Definition: h264.h:151
static struct @211 state
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:1755
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:713
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:338
static int get_avc_nalsize(H264Context *h, const uint8_t *buf, int buf_size, int *buf_index)
Definition: h264.h:1165
static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: h264_parser.c:569
#define CHROMA422(h)
Definition: h264.h:100
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
#define MAX_MMCO_COUNT
Definition: h264.h:54
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:335
#define END_NOT_FOUND
Definition: parser.h:40
unsigned int sps_id
Definition: h264.h:242
int frame_packing_arrangement_cancel_flag
is previous arrangement canceled, -1 if never received
Definition: h264.h:270
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264.h:184
6: bottom field, top field, bottom field repeated, in that order
Definition: h264.h:155
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5045
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:339
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:223
unsigned int list_count
Definition: h264.h:457
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:1786
#define PARSER_FLAG_ONCE
Definition: avcodec.h:4938
int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:324
int slice_context_count
Definition: h264.h:698
int mb_height
pic_height_in_map_units_minus1 + 1
Definition: h264.h:192
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 ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)
Definition: h264.c:436
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264.h:182
Bi-dir predicted.
Definition: avutil.h:268
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4937
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:616
int bit_depth_luma
bit_depth_luma_minus8 + 8
Definition: h264.h:229
#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:648
pixel format definitions
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5067
int mb_width
pic_width_in_mbs_minus1 + 1
Definition: h264.h:191
int delta_poc_bottom
Definition: h264.h:644
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4921
H264DSPContext h264dsp
Definition: h264.h:517
Definition: h264.h:119
#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:505
8: frame tripling
Definition: h264.h:157
unsigned int crop_bottom
frame_cropping_rect_bottom_offset
Definition: h264.h:202
exp golomb vlc stuff
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4952
int sei_recovery_frame_cnt
recovery_frame_cnt from SEI message
Definition: h264.h:770
int level_idc
Definition: h264.h:179
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:622
GetBitContext gb
Definition: h264.h:370
Predicted.
Definition: avutil.h:267