Libav
h264_parse.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
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8  *
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12  * Lesser General Public License for more details.
13  *
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15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "bytestream.h"
20 #include "get_bits.h"
21 #include "golomb.h"
22 #include "h264.h"
23 #include "h264dec.h"
24 #include "h264_parse.h"
25 #include "h264_ps.h"
26 
28  const int *ref_count, int slice_type_nos,
30 {
31  int list, i, j;
32  int luma_def, chroma_def;
33 
34  pwt->use_weight = 0;
35  pwt->use_weight_chroma = 0;
37  if (sps->chroma_format_idc)
39  luma_def = 1 << pwt->luma_log2_weight_denom;
40  chroma_def = 1 << pwt->chroma_log2_weight_denom;
41 
42  for (list = 0; list < 2; list++) {
43  pwt->luma_weight_flag[list] = 0;
44  pwt->chroma_weight_flag[list] = 0;
45  for (i = 0; i < ref_count[list]; i++) {
46  int luma_weight_flag, chroma_weight_flag;
47 
48  luma_weight_flag = get_bits1(gb);
49  if (luma_weight_flag) {
50  pwt->luma_weight[i][list][0] = get_se_golomb(gb);
51  pwt->luma_weight[i][list][1] = get_se_golomb(gb);
52  if (pwt->luma_weight[i][list][0] != luma_def ||
53  pwt->luma_weight[i][list][1] != 0) {
54  pwt->use_weight = 1;
55  pwt->luma_weight_flag[list] = 1;
56  }
57  } else {
58  pwt->luma_weight[i][list][0] = luma_def;
59  pwt->luma_weight[i][list][1] = 0;
60  }
61 
62  if (sps->chroma_format_idc) {
63  chroma_weight_flag = get_bits1(gb);
64  if (chroma_weight_flag) {
65  int j;
66  for (j = 0; j < 2; j++) {
67  pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
68  pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
69  if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
70  pwt->chroma_weight[i][list][j][1] != 0) {
71  pwt->use_weight_chroma = 1;
72  pwt->chroma_weight_flag[list] = 1;
73  }
74  }
75  } else {
76  int j;
77  for (j = 0; j < 2; j++) {
78  pwt->chroma_weight[i][list][j][0] = chroma_def;
79  pwt->chroma_weight[i][list][j][1] = 0;
80  }
81  }
82  }
83 
84  // for MBAFF
85  pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
86  pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
87  for (j = 0; j < 2; j++) {
88  pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
89  pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
90  }
91  }
92  if (slice_type_nos != AV_PICTURE_TYPE_B)
93  break;
94  }
95  pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
96  return 0;
97 }
98 
103 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
104  int top_samples_available, int left_samples_available)
105 {
106  static const int8_t top[12] = {
107  -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
108  };
109  static const int8_t left[12] = {
110  0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
111  };
112  int i;
113 
114  if (!(top_samples_available & 0x8000)) {
115  for (i = 0; i < 4; i++) {
116  int status = top[pred_mode_cache[scan8[0] + i]];
117  if (status < 0) {
118  av_log(logctx, AV_LOG_ERROR,
119  "top block unavailable for requested intra4x4 mode %d\n",
120  status);
121  return AVERROR_INVALIDDATA;
122  } else if (status) {
123  pred_mode_cache[scan8[0] + i] = status;
124  }
125  }
126  }
127 
128  if ((left_samples_available & 0x8888) != 0x8888) {
129  static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
130  for (i = 0; i < 4; i++)
131  if (!(left_samples_available & mask[i])) {
132  int status = left[pred_mode_cache[scan8[0] + 8 * i]];
133  if (status < 0) {
134  av_log(logctx, AV_LOG_ERROR,
135  "left block unavailable for requested intra4x4 mode %d\n",
136  status);
137  return AVERROR_INVALIDDATA;
138  } else if (status) {
139  pred_mode_cache[scan8[0] + 8 * i] = status;
140  }
141  }
142  }
143 
144  return 0;
145 }
146 
151 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
152  int left_samples_available,
153  int mode, int is_chroma)
154 {
155  static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
156  static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
157 
158  if (mode > 3U) {
159  av_log(logctx, AV_LOG_ERROR,
160  "out of range intra chroma pred mode\n");
161  return AVERROR_INVALIDDATA;
162  }
163 
164  if (!(top_samples_available & 0x8000)) {
165  mode = top[mode];
166  if (mode < 0) {
167  av_log(logctx, AV_LOG_ERROR,
168  "top block unavailable for requested intra mode\n");
169  return AVERROR_INVALIDDATA;
170  }
171  }
172 
173  if ((left_samples_available & 0x8080) != 0x8080) {
174  mode = left[mode];
175  if (is_chroma && (left_samples_available & 0x8080)) {
176  // mad cow disease mode, aka MBAFF + constrained_intra_pred
177  mode = ALZHEIMER_DC_L0T_PRED8x8 +
178  (!(left_samples_available & 0x8000)) +
179  2 * (mode == DC_128_PRED8x8);
180  }
181  if (mode < 0) {
182  av_log(logctx, AV_LOG_ERROR,
183  "left block unavailable for requested intra mode\n");
184  return AVERROR_INVALIDDATA;
185  }
186  }
187 
188  return mode;
189 }
190 
191 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
192  GetBitContext *gb, const PPS *pps,
193  int slice_type_nos, int picture_structure)
194 {
195  int list_count;
196  int num_ref_idx_active_override_flag, max_refs;
197 
198  // set defaults, might be overridden a few lines later
199  ref_count[0] = pps->ref_count[0];
200  ref_count[1] = pps->ref_count[1];
201 
202  if (slice_type_nos != AV_PICTURE_TYPE_I) {
203  num_ref_idx_active_override_flag = get_bits1(gb);
204 
205  if (num_ref_idx_active_override_flag) {
206  ref_count[0] = get_ue_golomb(gb) + 1;
207  if (ref_count[0] < 1)
208  goto fail;
209  if (slice_type_nos == AV_PICTURE_TYPE_B) {
210  ref_count[1] = get_ue_golomb(gb) + 1;
211  if (ref_count[1] < 1)
212  goto fail;
213  }
214  }
215 
216  if (slice_type_nos == AV_PICTURE_TYPE_B)
217  list_count = 2;
218  else
219  list_count = 1;
220  } else {
221  list_count = 0;
222  ref_count[0] = ref_count[1] = 0;
223  }
224 
225  max_refs = picture_structure == PICT_FRAME ? 16 : 32;
226 
227  if (ref_count[0] > max_refs || ref_count[1] > max_refs)
228  goto fail;
229 
230  *plist_count = list_count;
231 
232  return 0;
233 fail:
234  *plist_count = 0;
235  ref_count[0] = 0;
236  ref_count[1] = 0;
237  return AVERROR_INVALIDDATA;
238 }
239 
240 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
241  const SPS *sps, H264POCContext *pc,
242  int picture_structure, int nal_ref_idc)
243 {
244  const int max_frame_num = 1 << sps->log2_max_frame_num;
245  int field_poc[2];
246 
248  if (pc->frame_num < pc->prev_frame_num)
249  pc->frame_num_offset += max_frame_num;
250 
251  if (sps->poc_type == 0) {
252  const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
253 
254  if (pc->poc_lsb < pc->prev_poc_lsb &&
255  pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
256  pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
257  else if (pc->poc_lsb > pc->prev_poc_lsb &&
258  pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
259  pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
260  else
261  pc->poc_msb = pc->prev_poc_msb;
262  field_poc[0] =
263  field_poc[1] = pc->poc_msb + pc->poc_lsb;
264  if (picture_structure == PICT_FRAME)
265  field_poc[1] += pc->delta_poc_bottom;
266  } else if (sps->poc_type == 1) {
267  int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
268  int i;
269 
270  if (sps->poc_cycle_length != 0)
271  abs_frame_num = pc->frame_num_offset + pc->frame_num;
272  else
273  abs_frame_num = 0;
274 
275  if (nal_ref_idc == 0 && abs_frame_num > 0)
276  abs_frame_num--;
277 
278  expected_delta_per_poc_cycle = 0;
279  for (i = 0; i < sps->poc_cycle_length; i++)
280  // FIXME integrate during sps parse
281  expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
282 
283  if (abs_frame_num > 0) {
284  int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
285  int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
286 
287  expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
288  for (i = 0; i <= frame_num_in_poc_cycle; i++)
289  expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
290  } else
291  expectedpoc = 0;
292 
293  if (nal_ref_idc == 0)
294  expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
295 
296  field_poc[0] = expectedpoc + pc->delta_poc[0];
297  field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
298 
299  if (picture_structure == PICT_FRAME)
300  field_poc[1] += pc->delta_poc[1];
301  } else {
302  int poc = 2 * (pc->frame_num_offset + pc->frame_num);
303 
304  if (!nal_ref_idc)
305  poc--;
306 
307  field_poc[0] = poc;
308  field_poc[1] = poc;
309  }
310 
311  if (picture_structure != PICT_BOTTOM_FIELD)
312  pic_field_poc[0] = field_poc[0];
313  if (picture_structure != PICT_TOP_FIELD)
314  pic_field_poc[1] = field_poc[1];
315  *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
316 
317  return 0;
318 }
319 
320 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
321  int is_avc, void *logctx)
322 {
323  H2645Packet pkt = { 0 };
324  int i, ret = 0;
325 
326  ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264);
327  if (ret < 0)
328  goto fail;
329 
330  for (i = 0; i < pkt.nb_nals; i++) {
331  H2645NAL *nal = &pkt.nals[i];
332  switch (nal->type) {
333  case H264_NAL_SPS:
334  ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps);
335  if (ret < 0)
336  goto fail;
337  break;
338  case H264_NAL_PPS:
339  ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
340  nal->size_bits);
341  if (ret < 0)
342  goto fail;
343  break;
344  default:
345  av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
346  nal->type);
347  break;
348  }
349  }
350 
351 fail:
353  return ret;
354 }
355 
356 /* There are (invalid) samples in the wild with mp4-style extradata, where the
357  * parameter sets are stored unescaped (i.e. as RBSP).
358  * This function catches the parameter set decoding failure and tries again
359  * after escaping it */
360 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
361  int err_recognition, void *logctx)
362 {
363  int ret;
364 
365  ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
366  if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
367  GetByteContext gbc;
368  PutByteContext pbc;
369  uint8_t *escaped_buf;
370  int escaped_buf_size;
371 
372  av_log(logctx, AV_LOG_WARNING,
373  "SPS decoding failure, trying again after escaping the NAL\n");
374 
375  if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
376  return AVERROR(ERANGE);
377  escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
378  escaped_buf = av_mallocz(escaped_buf_size);
379  if (!escaped_buf)
380  return AVERROR(ENOMEM);
381 
382  bytestream2_init(&gbc, buf, buf_size);
383  bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
384 
385  while (bytestream2_get_bytes_left(&gbc)) {
386  if (bytestream2_get_bytes_left(&gbc) >= 3 &&
387  bytestream2_peek_be24(&gbc) <= 3) {
388  bytestream2_put_be24(&pbc, 3);
389  bytestream2_skip(&gbc, 2);
390  } else
391  bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
392  }
393 
394  escaped_buf_size = bytestream2_tell_p(&pbc);
395  AV_WB16(escaped_buf, escaped_buf_size - 2);
396 
397  ret = decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
398  av_freep(&escaped_buf);
399  if (ret < 0)
400  return ret;
401  }
402 
403  return 0;
404 }
405 
407  int *is_avc, int *nal_length_size,
408  int err_recognition, void *logctx)
409 {
410  int ret;
411 
412  if (data[0] == 1) {
413  int i, cnt, nalsize;
414  const uint8_t *p = data;
415 
416  *is_avc = 1;
417 
418  if (size < 7) {
419  av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
420  return AVERROR_INVALIDDATA;
421  }
422 
423  // Decode sps from avcC
424  cnt = *(p + 5) & 0x1f; // Number of sps
425  p += 6;
426  for (i = 0; i < cnt; i++) {
427  nalsize = AV_RB16(p) + 2;
428  if (p - data + nalsize > size)
429  return AVERROR_INVALIDDATA;
430  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
431  if (ret < 0) {
432  av_log(logctx, AV_LOG_ERROR,
433  "Decoding sps %d from avcC failed\n", i);
434  return ret;
435  }
436  p += nalsize;
437  }
438  // Decode pps from avcC
439  cnt = *(p++); // Number of pps
440  for (i = 0; i < cnt; i++) {
441  nalsize = AV_RB16(p) + 2;
442  if (p - data + nalsize > size)
443  return AVERROR_INVALIDDATA;
444  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
445  if (ret < 0) {
446  av_log(logctx, AV_LOG_ERROR,
447  "Decoding pps %d from avcC failed\n", i);
448  return ret;
449  }
450  p += nalsize;
451  }
452  // Store right nal length size that will be used to parse all other nals
453  *nal_length_size = (data[4] & 0x03) + 1;
454  } else {
455  *is_avc = 0;
456  ret = decode_extradata_ps(data, size, ps, 0, logctx);
457  if (ret < 0)
458  return ret;
459  }
460  return 0;
461 }
462 
470 int ff_h264_get_profile(const SPS *sps)
471 {
472  int profile = sps->profile_idc;
473 
474  switch (sps->profile_idc) {
476  // constraint_set1_flag set to 1
477  profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
478  break;
482  // constraint_set3_flag set to 1
483  profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
484  break;
485  }
486 
487  return profile;
488 }
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
#define DC_128_PRED8x8
Definition: h264pred.h:76
int size
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:179
Definition: vf_drawbox.c:37
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
int luma_weight_flag[2]
7.4.3.2 luma_weight_lX_flag
Definition: h264_parse.h:35
static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps, int err_recognition, void *logctx)
Definition: h264_parse.c:360
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:39
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
#define FF_PROFILE_H264_INTRA
Definition: avcodec.h:2910
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264_ps.h:112
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:141
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 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)
Split an input packet into NAL units.
Definition: h2645_parse.c:214
Picture parameter set.
Definition: h264_ps.h:106
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:132
int profile_idc
Definition: h264_ps.h:45
int size_bits
Size, in bits, of just the data, excluding the stop bit and any trailing padding. ...
Definition: h2645_parse.h:40
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE
Definition: avcodec.h:2924
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
#define FF_PROFILE_H264_BASELINE
Definition: avcodec.h:2912
uint8_t
int offset_for_non_ref_pic
Definition: h264_ps.h:53
int frame_num_offset
for POC type 2
Definition: h264_parse.h:51
int chroma_weight_flag[2]
7.4.3.2 chroma_weight_lX_flag
Definition: h264_parse.h:36
#define TOP_DC_PRED8x8
Definition: h264pred.h:75
void ff_h2645_packet_uninit(H2645Packet *pkt)
Free all the allocated memory in the packet.
Definition: h2645_parse.c:323
const char data[16]
Definition: mxf.c:70
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
bitstream reader API header.
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:140
int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, int top_samples_available, int left_samples_available)
Check if the top & left blocks are available if needed and change the dc mode so it only uses the ava...
Definition: h264_parse.c:103
static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps, int is_avc, void *logctx)
Definition: h264_parse.c:320
int luma_weight[48][2][2]
Definition: h264_parse.h:38
H.264 common definitions.
H.264 parameter set handling.
int chroma_log2_weight_denom
Definition: h264_parse.h:34
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
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_ps.h:50
static const uint16_t mask[17]
Definition: lzw.c:38
int ff_h264_get_profile(const SPS *sps)
Compute profile from profile_idc and constraint_set?_flags.
Definition: h264_parse.c:470
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:161
#define ALZHEIMER_DC_L0T_PRED8x8
Definition: h264pred.h:79
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:151
#define FF_PROFILE_H264_HIGH_422
Definition: avcodec.h:2920
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:190
#define fail()
Definition: checkasm.h:80
int offset_for_top_to_bottom_field
Definition: h264_ps.h:54
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:49
#define FFMIN(a, b)
Definition: common.h:66
int poc_cycle_length
num_ref_frames_in_pic_order_cnt_cycle
Definition: h264_ps.h:55
H.264 / AVC / MPEG-4 part10 codec.
#define AV_EF_EXPLODE
Definition: avcodec.h:2681
#define LEFT_DC_PRED8x8
Definition: h264pred.h:74
int type
NAL unit type.
Definition: h2645_parse.h:50
if(ac->has_optimized_func)
short offset_for_ref_frame[256]
Definition: h264_ps.h:83
int delta_poc_bottom
Definition: h264_parse.h:46
static const uint8_t scan8[16 *3+3]
Definition: h264dec.h:622
int constraint_set_flags
constraint_set[0-3]_flag
Definition: h264_ps.h:100
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:267
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:53
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264_ps.h:51
mfxU16 profile
Definition: qsvenc.c:43
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, int left_samples_available, int mode, int is_chroma)
Check if the top & left blocks are available if needed and change the dc mode so it only uses the ava...
Definition: h264_parse.c:151
int log2_max_frame_num
log2_max_frame_num_minus4 + 4
Definition: h264_ps.h:49
Bi-dir predicted.
Definition: avutil.h:262
GetBitContext gb
Definition: h2645_parse.h:45
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:638
int delta_poc[2]
Definition: h264_parse.h:47
#define PICT_FRAME
Definition: mpegutils.h:39
H2645NAL * nals
Definition: h2645_parse.h:65
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:52
#define FF_PROFILE_H264_CONSTRAINED
Definition: avcodec.h:2909
#define AV_WB16(p, val)
Definition: intreadwrite.h:218
H.264 decoder/parser shared code.
#define FF_PROFILE_H264_HIGH_10
Definition: avcodec.h:2917
exp golomb vlc stuff
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
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:211
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps)
Decode SPS.
Definition: h264_ps.c:324