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h2645_parse.c
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1 /*
2  * H.264/HEVC common parsing code
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <string.h>
22 
23 #include "config.h"
24 
25 #include "libavutil/intmath.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mem.h"
28 
29 #include "bytestream.h"
30 #include "hevc.h"
31 #include "h264.h"
32 #include "h2645_parse.h"
33 
35  H2645RBSP *rbsp, H2645NAL *nal, int small_padding)
36 {
37  int i, si, di;
38  uint8_t *dst;
39 
40  nal->skipped_bytes = 0;
41 #define STARTCODE_TEST \
42  if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \
43  if (src[i + 2] != 3 && src[i + 2] != 0) { \
44  /* startcode, so we must be past the end */ \
45  length = i; \
46  } \
47  break; \
48  }
49 #if HAVE_FAST_UNALIGNED
50 #define FIND_FIRST_ZERO \
51  if (i > 0 && !src[i]) \
52  i--; \
53  while (src[i]) \
54  i++
55 #if HAVE_FAST_64BIT
56  for (i = 0; i + 1 < length; i += 9) {
57  if (!((~AV_RN64(src + i) &
58  (AV_RN64(src + i) - 0x0100010001000101ULL)) &
59  0x8000800080008080ULL))
60  continue;
61  FIND_FIRST_ZERO;
63  i -= 7;
64  }
65 #else
66  for (i = 0; i + 1 < length; i += 5) {
67  if (!((~AV_RN32(src + i) &
68  (AV_RN32(src + i) - 0x01000101U)) &
69  0x80008080U))
70  continue;
71  FIND_FIRST_ZERO;
73  i -= 3;
74  }
75 #endif /* HAVE_FAST_64BIT */
76 #else
77  for (i = 0; i + 1 < length; i += 2) {
78  if (src[i])
79  continue;
80  if (i > 0 && src[i - 1] == 0)
81  i--;
83  }
84 #endif /* HAVE_FAST_UNALIGNED */
85 
86  if (i >= length - 1 && small_padding) { // no escaped 0
87  nal->data =
88  nal->raw_data = src;
89  nal->size =
90  nal->raw_size = length;
91  return length;
92  } else if (i > length)
93  i = length;
94 
95  nal->rbsp_buffer = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
96  dst = nal->rbsp_buffer;
97 
98  memcpy(dst, src, i);
99  si = di = i;
100  while (si + 2 < length) {
101  // remove escapes (very rare 1:2^22)
102  if (src[si + 2] > 3) {
103  dst[di++] = src[si++];
104  dst[di++] = src[si++];
105  } else if (src[si] == 0 && src[si + 1] == 0 && src[si + 2] != 0) {
106  if (src[si + 2] == 3) { // escape
107  dst[di++] = 0;
108  dst[di++] = 0;
109  si += 3;
110 
111  if (nal->skipped_bytes_pos) {
112  nal->skipped_bytes++;
113  if (nal->skipped_bytes_pos_size < nal->skipped_bytes) {
114  nal->skipped_bytes_pos_size *= 2;
118  sizeof(*nal->skipped_bytes_pos));
119  if (!nal->skipped_bytes_pos) {
120  nal->skipped_bytes_pos_size = 0;
121  return AVERROR(ENOMEM);
122  }
123  }
124  if (nal->skipped_bytes_pos)
125  nal->skipped_bytes_pos[nal->skipped_bytes-1] = di - 1;
126  }
127  continue;
128  } else // next start code
129  goto nsc;
130  }
131 
132  dst[di++] = src[si++];
133  }
134  while (si < length)
135  dst[di++] = src[si++];
136 
137 nsc:
138  memset(dst + di, 0, AV_INPUT_BUFFER_PADDING_SIZE);
139 
140  nal->data = dst;
141  nal->size = di;
142  nal->raw_data = src;
143  nal->raw_size = si;
144  rbsp->rbsp_buffer_size += si;
145 
146  return si;
147 }
148 
149 static const char *hevc_nal_type_name[64] = {
150  "TRAIL_N", // HEVC_NAL_TRAIL_N
151  "TRAIL_R", // HEVC_NAL_TRAIL_R
152  "TSA_N", // HEVC_NAL_TSA_N
153  "TSA_R", // HEVC_NAL_TSA_R
154  "STSA_N", // HEVC_NAL_STSA_N
155  "STSA_R", // HEVC_NAL_STSA_R
156  "RADL_N", // HEVC_NAL_RADL_N
157  "RADL_R", // HEVC_NAL_RADL_R
158  "RASL_N", // HEVC_NAL_RASL_N
159  "RASL_R", // HEVC_NAL_RASL_R
160  "RSV_VCL_N10", // HEVC_NAL_VCL_N10
161  "RSV_VCL_R11", // HEVC_NAL_VCL_R11
162  "RSV_VCL_N12", // HEVC_NAL_VCL_N12
163  "RSV_VLC_R13", // HEVC_NAL_VCL_R13
164  "RSV_VCL_N14", // HEVC_NAL_VCL_N14
165  "RSV_VCL_R15", // HEVC_NAL_VCL_R15
166  "BLA_W_LP", // HEVC_NAL_BLA_W_LP
167  "BLA_W_RADL", // HEVC_NAL_BLA_W_RADL
168  "BLA_N_LP", // HEVC_NAL_BLA_N_LP
169  "IDR_W_RADL", // HEVC_NAL_IDR_W_RADL
170  "IDR_N_LP", // HEVC_NAL_IDR_N_LP
171  "CRA_NUT", // HEVC_NAL_CRA_NUT
172  "IRAP_IRAP_VCL22", // HEVC_NAL_IRAP_VCL22
173  "IRAP_IRAP_VCL23", // HEVC_NAL_IRAP_VCL23
174  "RSV_VCL24", // HEVC_NAL_RSV_VCL24
175  "RSV_VCL25", // HEVC_NAL_RSV_VCL25
176  "RSV_VCL26", // HEVC_NAL_RSV_VCL26
177  "RSV_VCL27", // HEVC_NAL_RSV_VCL27
178  "RSV_VCL28", // HEVC_NAL_RSV_VCL28
179  "RSV_VCL29", // HEVC_NAL_RSV_VCL29
180  "RSV_VCL30", // HEVC_NAL_RSV_VCL30
181  "RSV_VCL31", // HEVC_NAL_RSV_VCL31
182  "VPS", // HEVC_NAL_VPS
183  "SPS", // HEVC_NAL_SPS
184  "PPS", // HEVC_NAL_PPS
185  "AUD", // HEVC_NAL_AUD
186  "EOS_NUT", // HEVC_NAL_EOS_NUT
187  "EOB_NUT", // HEVC_NAL_EOB_NUT
188  "FD_NUT", // HEVC_NAL_FD_NUT
189  "SEI_PREFIX", // HEVC_NAL_SEI_PREFIX
190  "SEI_SUFFIX", // HEVC_NAL_SEI_SUFFIX
191  "RSV_NVCL41", // HEVC_NAL_RSV_NVCL41
192  "RSV_NVCL42", // HEVC_NAL_RSV_NVCL42
193  "RSV_NVCL43", // HEVC_NAL_RSV_NVCL43
194  "RSV_NVCL44", // HEVC_NAL_RSV_NVCL44
195  "RSV_NVCL45", // HEVC_NAL_RSV_NVCL45
196  "RSV_NVCL46", // HEVC_NAL_RSV_NVCL46
197  "RSV_NVCL47", // HEVC_NAL_RSV_NVCL47
198  "UNSPEC48", // HEVC_NAL_UNSPEC48
199  "UNSPEC49", // HEVC_NAL_UNSPEC49
200  "UNSPEC50", // HEVC_NAL_UNSPEC50
201  "UNSPEC51", // HEVC_NAL_UNSPEC51
202  "UNSPEC52", // HEVC_NAL_UNSPEC52
203  "UNSPEC53", // HEVC_NAL_UNSPEC53
204  "UNSPEC54", // HEVC_NAL_UNSPEC54
205  "UNSPEC55", // HEVC_NAL_UNSPEC55
206  "UNSPEC56", // HEVC_NAL_UNSPEC56
207  "UNSPEC57", // HEVC_NAL_UNSPEC57
208  "UNSPEC58", // HEVC_NAL_UNSPEC58
209  "UNSPEC59", // HEVC_NAL_UNSPEC59
210  "UNSPEC60", // HEVC_NAL_UNSPEC60
211  "UNSPEC61", // HEVC_NAL_UNSPEC61
212  "UNSPEC62", // HEVC_NAL_UNSPEC62
213  "UNSPEC63", // HEVC_NAL_UNSPEC63
214 };
215 
216 static const char *hevc_nal_unit_name(int nal_type)
217 {
218  av_assert0(nal_type >= 0 && nal_type < 64);
219  return hevc_nal_type_name[nal_type];
220 }
221 
222 static const char *h264_nal_type_name[32] = {
223  "Unspecified 0", //H264_NAL_UNSPECIFIED
224  "Coded slice of a non-IDR picture", // H264_NAL_SLICE
225  "Coded slice data partition A", // H264_NAL_DPA
226  "Coded slice data partition B", // H264_NAL_DPB
227  "Coded slice data partition C", // H264_NAL_DPC
228  "IDR", // H264_NAL_IDR_SLICE
229  "SEI", // H264_NAL_SEI
230  "SPS", // H264_NAL_SPS
231  "PPS", // H264_NAL_PPS
232  "AUD", // H264_NAL_AUD
233  "End of sequence", // H264_NAL_END_SEQUENCE
234  "End of stream", // H264_NAL_END_STREAM
235  "Filler data", // H264_NAL_FILLER_DATA
236  "SPS extension", // H264_NAL_SPS_EXT
237  "Prefix", // H264_NAL_PREFIX
238  "Subset SPS", // H264_NAL_SUB_SPS
239  "Depth parameter set", // H264_NAL_DPS
240  "Reserved 17", // H264_NAL_RESERVED17
241  "Reserved 18", // H264_NAL_RESERVED18
242  "Auxiliary coded picture without partitioning", // H264_NAL_AUXILIARY_SLICE
243  "Slice extension", // H264_NAL_EXTEN_SLICE
244  "Slice extension for a depth view or a 3D-AVC texture view", // H264_NAL_DEPTH_EXTEN_SLICE
245  "Reserved 22", // H264_NAL_RESERVED22
246  "Reserved 23", // H264_NAL_RESERVED23
247  "Unspecified 24", // H264_NAL_UNSPECIFIED24
248  "Unspecified 25", // H264_NAL_UNSPECIFIED25
249  "Unspecified 26", // H264_NAL_UNSPECIFIED26
250  "Unspecified 27", // H264_NAL_UNSPECIFIED27
251  "Unspecified 28", // H264_NAL_UNSPECIFIED28
252  "Unspecified 29", // H264_NAL_UNSPECIFIED29
253  "Unspecified 30", // H264_NAL_UNSPECIFIED30
254  "Unspecified 31", // H264_NAL_UNSPECIFIED31
255 };
256 
257 static const char *h264_nal_unit_name(int nal_type)
258 {
259  av_assert0(nal_type >= 0 && nal_type < 32);
260  return h264_nal_type_name[nal_type];
261 }
262 
263 static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
264 {
265  int size = nal->size;
266  int v;
267 
268  while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0)
269  size--;
270 
271  if (!size)
272  return 0;
273 
274  v = nal->data[size - 1];
275 
276  if (size > INT_MAX / 8)
277  return AVERROR(ERANGE);
278  size *= 8;
279 
280  /* remove the stop bit and following trailing zeros,
281  * or nothing for damaged bitstreams */
282  if (v)
283  size -= ff_ctz(v) + 1;
284 
285  return size;
286 }
287 
288 /**
289  * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
290  * 0 if the unit should be skipped, 1 otherwise
291  */
292 static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
293 {
294  GetBitContext *gb = &nal->gb;
295  int nuh_layer_id;
296 
297  if (get_bits1(gb) != 0)
298  return AVERROR_INVALIDDATA;
299 
300  nal->type = get_bits(gb, 6);
301 
302  nuh_layer_id = get_bits(gb, 6);
303  nal->temporal_id = get_bits(gb, 3) - 1;
304  if (nal->temporal_id < 0)
305  return AVERROR_INVALIDDATA;
306 
307  av_log(logctx, AV_LOG_DEBUG,
308  "nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n",
309  nal->type, hevc_nal_unit_name(nal->type), nuh_layer_id, nal->temporal_id);
310 
311  return nuh_layer_id == 0;
312 }
313 
314 static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
315 {
316  GetBitContext *gb = &nal->gb;
317 
318  if (get_bits1(gb) != 0)
319  return AVERROR_INVALIDDATA;
320 
321  nal->ref_idc = get_bits(gb, 2);
322  nal->type = get_bits(gb, 5);
323 
324  av_log(logctx, AV_LOG_DEBUG,
325  "nal_unit_type: %d(%s), nal_ref_idc: %d\n",
326  nal->type, h264_nal_unit_name(nal->type), nal->ref_idc);
327 
328  return 1;
329 }
330 
331 static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc)
332 {
333  int i = 0;
334 
335  if (buf + 3 >= next_avc)
336  return next_avc - buf;
337 
338  while (buf + i + 3 < next_avc) {
339  if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1)
340  break;
341  i++;
342  }
343  return i + 3;
344 }
345 
347  void *logctx, int is_nalff, int nal_length_size,
348  enum AVCodecID codec_id, int small_padding)
349 {
350  GetByteContext bc;
351  int consumed, ret = 0;
352  int next_avc = is_nalff ? 0 : length;
353  int64_t padding = small_padding ? 0 : MAX_MBPAIR_SIZE;
354 
355  bytestream2_init(&bc, buf, length);
356  av_fast_padded_malloc(&pkt->rbsp.rbsp_buffer, &pkt->rbsp.rbsp_buffer_alloc_size, length + padding);
357  if (!pkt->rbsp.rbsp_buffer)
358  return AVERROR(ENOMEM);
359 
360  pkt->rbsp.rbsp_buffer_size = 0;
361  pkt->nb_nals = 0;
362  while (bytestream2_get_bytes_left(&bc) >= 4) {
363  H2645NAL *nal;
364  int extract_length = 0;
365  int skip_trailing_zeros = 1;
366 
367  if (bytestream2_tell(&bc) == next_avc) {
368  int i = 0;
369  extract_length = get_nalsize(nal_length_size,
370  bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx);
371  if (extract_length < 0)
372  return extract_length;
373 
374  bytestream2_skip(&bc, nal_length_size);
375 
376  next_avc = bytestream2_tell(&bc) + extract_length;
377  } else {
378  int buf_index;
379 
380  if (bytestream2_tell(&bc) > next_avc)
381  av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n");
382 
383  /* search start code */
384  buf_index = find_next_start_code(bc.buffer, buf + next_avc);
385 
386  bytestream2_skip(&bc, buf_index);
387 
388  if (!bytestream2_get_bytes_left(&bc)) {
389  if (pkt->nb_nals > 0) {
390  // No more start codes: we discarded some irrelevant
391  // bytes at the end of the packet.
392  return 0;
393  } else {
394  av_log(logctx, AV_LOG_ERROR, "No start code is found.\n");
395  return AVERROR_INVALIDDATA;
396  }
397  }
398 
399  extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc));
400 
401  if (bytestream2_tell(&bc) >= next_avc) {
402  /* skip to the start of the next NAL */
403  bytestream2_skip(&bc, next_avc - bytestream2_tell(&bc));
404  continue;
405  }
406  }
407 
408  if (pkt->nals_allocated < pkt->nb_nals + 1) {
409  int new_size = pkt->nals_allocated + 1;
410  void *tmp = av_realloc_array(pkt->nals, new_size, sizeof(*pkt->nals));
411 
412  if (!tmp)
413  return AVERROR(ENOMEM);
414 
415  pkt->nals = tmp;
416  memset(pkt->nals + pkt->nals_allocated, 0,
417  (new_size - pkt->nals_allocated) * sizeof(*pkt->nals));
418 
419  nal = &pkt->nals[pkt->nb_nals];
420  nal->skipped_bytes_pos_size = 1024; // initial buffer size
422  if (!nal->skipped_bytes_pos)
423  return AVERROR(ENOMEM);
424 
425  pkt->nals_allocated = new_size;
426  }
427  nal = &pkt->nals[pkt->nb_nals];
428 
429  consumed = ff_h2645_extract_rbsp(bc.buffer, extract_length, &pkt->rbsp, nal, small_padding);
430  if (consumed < 0)
431  return consumed;
432 
433  if (is_nalff && (extract_length != consumed) && extract_length)
434  av_log(logctx, AV_LOG_DEBUG,
435  "NALFF: Consumed only %d bytes instead of %d\n",
436  consumed, extract_length);
437 
438  pkt->nb_nals++;
439 
440  bytestream2_skip(&bc, consumed);
441 
442  /* see commit 3566042a0 */
443  if (bytestream2_get_bytes_left(&bc) >= 4 &&
444  bytestream2_peek_be32(&bc) == 0x000001E0)
445  skip_trailing_zeros = 0;
446 
447  nal->size_bits = get_bit_length(nal, skip_trailing_zeros);
448 
449  ret = init_get_bits(&nal->gb, nal->data, nal->size_bits);
450  if (ret < 0)
451  return ret;
452 
453  if (codec_id == AV_CODEC_ID_HEVC)
454  ret = hevc_parse_nal_header(nal, logctx);
455  else
456  ret = h264_parse_nal_header(nal, logctx);
457  if (ret <= 0 || nal->size <= 0 || nal->size_bits <= 0) {
458  if (ret < 0) {
459  av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit %d, skipping.\n",
460  nal->type);
461  }
462  pkt->nb_nals--;
463  }
464  }
465 
466  return 0;
467 }
468 
470 {
471  int i;
472  for (i = 0; i < pkt->nals_allocated; i++) {
473  av_freep(&pkt->nals[i].skipped_bytes_pos);
474  }
475  av_freep(&pkt->nals);
476  pkt->nals_allocated = 0;
477  av_freep(&pkt->rbsp.rbsp_buffer);
479 }
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, void *logctx, int is_nalff, int nal_length_size, enum AVCodecID codec_id, int small_padding)
Split an input packet into NAL units.
Definition: h2645_parse.c:346
#define ff_ctz
Definition: intmath.h:106
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
Definition: h2645_parse.h:34
static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
Definition: h2645_parse.c:263
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:269
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Memory handling functions.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:70
static AVPacket pkt
#define src
Definition: vp8dsp.c:254
int size_bits
Size, in bits, of just the data, excluding the stop bit and any trailing padding. ...
Definition: h2645_parse.h:41
int skipped_bytes_pos_size
Definition: h2645_parse.h:59
#define STARTCODE_TEST
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
static const char * h264_nal_type_name[32]
Definition: h2645_parse.c:222
void ff_h2645_packet_uninit(H2645Packet *pkt)
Free all the allocated memory in the packet.
Definition: h2645_parse.c:469
const uint8_t * buffer
Definition: bytestream.h:34
ptrdiff_t size
Definition: opengl_enc.c:101
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:198
#define av_log(a,...)
H.264 common definitions.
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int * skipped_bytes_pos
Definition: h2645_parse.h:60
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
GLsizei GLsizei * length
Definition: opengl_enc.c:115
int raw_size
Definition: h2645_parse.h:43
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:205
#define MAX_MBPAIR_SIZE
Definition: h2645_parse.h:29
#define FFMIN(a, b)
Definition: common.h:96
static int get_nalsize(int nal_length_size, const uint8_t *buf, int buf_size, int *buf_index, void *logctx)
Definition: h2645_parse.h:99
enum AVCodecID codec_id
Definition: vaapi_decode.c:362
int ref_idc
H.264 only, nal_ref_idc.
Definition: h2645_parse.h:64
int type
NAL unit type.
Definition: h2645_parse.h:51
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
int nals_allocated
Definition: h2645_parse.h:78
static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
Definition: h2645_parse.c:292
static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
Definition: h2645_parse.c:314
const uint8_t * data
Definition: h2645_parse.h:35
void * buf
Definition: avisynth_c.h:690
int rbsp_buffer_size
Definition: h2645_parse.h:70
int rbsp_buffer_alloc_size
Definition: h2645_parse.h:69
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:321
uint8_t * rbsp_buffer
Definition: h2645_parse.h:68
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:433
#define AV_RN32(p)
Definition: intreadwrite.h:364
H2645RBSP rbsp
Definition: h2645_parse.h:76
static const char * hevc_nal_unit_name(int nal_type)
Definition: h2645_parse.c:216
int skipped_bytes
Definition: h2645_parse.h:58
GetBitContext gb
Definition: h2645_parse.h:46
static const char * h264_nal_unit_name(int nal_type)
Definition: h2645_parse.c:257
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:775
const uint8_t * raw_data
Definition: h2645_parse.h:44
H2645NAL * nals
Definition: h2645_parse.h:75
#define AV_RN64(p)
Definition: intreadwrite.h:368
int temporal_id
HEVC only, nuh_temporal_id_plus_1 - 1.
Definition: h2645_parse.h:56
uint8_t * rbsp_buffer
Definition: h2645_parse.h:32
#define av_freep(p)
#define av_malloc_array(a, b)
static const char * hevc_nal_type_name[64]
Definition: h2645_parse.c:149
int ff_h2645_extract_rbsp(const uint8_t *src, int length, H2645RBSP *rbsp, H2645NAL *nal, int small_padding)
Extract the raw (unescaped) bitstream.
Definition: h2645_parse.c:34
static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc)
Definition: h2645_parse.c:331
static uint8_t tmp[11]
Definition: aes_ctr.c:26