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h264_parse.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg 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
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; 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 "h264_parse.h"
24 
26  const int *ref_count, int slice_type_nos,
27  H264PredWeightTable *pwt, void *logctx)
28 {
29  int list, i;
30  int luma_def, chroma_def;
31 
32  pwt->use_weight = 0;
33  pwt->use_weight_chroma = 0;
35  if (sps->chroma_format_idc)
37 
38  if (pwt->luma_log2_weight_denom > 7U) {
39  av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
40  pwt->luma_log2_weight_denom = 0;
41  }
42  if (pwt->chroma_log2_weight_denom > 7U) {
43  av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
44  pwt->chroma_log2_weight_denom = 0;
45  }
46 
47  luma_def = 1 << pwt->luma_log2_weight_denom;
48  chroma_def = 1 << pwt->chroma_log2_weight_denom;
49 
50  for (list = 0; list < 2; list++) {
51  pwt->luma_weight_flag[list] = 0;
52  pwt->chroma_weight_flag[list] = 0;
53  for (i = 0; i < ref_count[list]; i++) {
54  int luma_weight_flag, chroma_weight_flag;
55 
56  luma_weight_flag = get_bits1(gb);
57  if (luma_weight_flag) {
58  pwt->luma_weight[i][list][0] = get_se_golomb(gb);
59  pwt->luma_weight[i][list][1] = get_se_golomb(gb);
60  if (pwt->luma_weight[i][list][0] != luma_def ||
61  pwt->luma_weight[i][list][1] != 0) {
62  pwt->use_weight = 1;
63  pwt->luma_weight_flag[list] = 1;
64  }
65  } else {
66  pwt->luma_weight[i][list][0] = luma_def;
67  pwt->luma_weight[i][list][1] = 0;
68  }
69 
70  if (sps->chroma_format_idc) {
71  chroma_weight_flag = get_bits1(gb);
72  if (chroma_weight_flag) {
73  int j;
74  for (j = 0; j < 2; j++) {
75  pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
76  pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
77  if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
78  pwt->chroma_weight[i][list][j][1] != 0) {
79  pwt->use_weight_chroma = 1;
80  pwt->chroma_weight_flag[list] = 1;
81  }
82  }
83  } else {
84  int j;
85  for (j = 0; j < 2; j++) {
86  pwt->chroma_weight[i][list][j][0] = chroma_def;
87  pwt->chroma_weight[i][list][j][1] = 0;
88  }
89  }
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 
99 /**
100  * Check if the top & left blocks are available if needed and
101  * change the dc mode so it only uses the available blocks.
102  */
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 intra 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 
147 /**
148  * Check if the top & left blocks are available if needed and
149  * change the dc mode so it only uses the available blocks.
150  */
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 (mode < 0) {
176  av_log(logctx, AV_LOG_ERROR,
177  "left block unavailable for requested intra mode\n");
178  return AVERROR_INVALIDDATA;
179  }
180  if (is_chroma && (left_samples_available & 0x8080)) {
181  // mad cow disease mode, aka MBAFF + constrained_intra_pred
182  mode = ALZHEIMER_DC_L0T_PRED8x8 +
183  (!(left_samples_available & 0x8000)) +
184  2 * (mode == DC_128_PRED8x8);
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, void *logctx)
194 {
195  int list_count;
196  int num_ref_idx_active_override_flag;
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  unsigned max[2];
204  max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
205 
206  num_ref_idx_active_override_flag = get_bits1(gb);
207 
208  if (num_ref_idx_active_override_flag) {
209  ref_count[0] = get_ue_golomb(gb) + 1;
210  if (slice_type_nos == AV_PICTURE_TYPE_B) {
211  ref_count[1] = get_ue_golomb(gb) + 1;
212  } else
213  // full range is spec-ok in this case, even for frames
214  ref_count[1] = 1;
215  }
216 
217  if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) {
218  av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
219  ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
220  ref_count[0] = ref_count[1] = 0;
221  *plist_count = 0;
222  goto fail;
223  }
224 
225  if (slice_type_nos == AV_PICTURE_TYPE_B)
226  list_count = 2;
227  else
228  list_count = 1;
229  } else {
230  list_count = 0;
231  ref_count[0] = ref_count[1] = 0;
232  }
233 
234  *plist_count = list_count;
235 
236  return 0;
237 fail:
238  *plist_count = 0;
239  ref_count[0] = 0;
240  ref_count[1] = 0;
241  return AVERROR_INVALIDDATA;
242 }
243 
244 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
245  const SPS *sps, H264POCContext *pc,
246  int picture_structure, int nal_ref_idc)
247 {
248  const int max_frame_num = 1 << sps->log2_max_frame_num;
249  int field_poc[2];
250 
252  if (pc->frame_num < pc->prev_frame_num)
253  pc->frame_num_offset += max_frame_num;
254 
255  if (sps->poc_type == 0) {
256  const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
257 
258  if (pc->poc_lsb < pc->prev_poc_lsb &&
259  pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
260  pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
261  else if (pc->poc_lsb > pc->prev_poc_lsb &&
262  pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
263  pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
264  else
265  pc->poc_msb = pc->prev_poc_msb;
266  field_poc[0] =
267  field_poc[1] = pc->poc_msb + pc->poc_lsb;
268  if (picture_structure == PICT_FRAME)
269  field_poc[1] += pc->delta_poc_bottom;
270  } else if (sps->poc_type == 1) {
271  int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
272  int i;
273 
274  if (sps->poc_cycle_length != 0)
275  abs_frame_num = pc->frame_num_offset + pc->frame_num;
276  else
277  abs_frame_num = 0;
278 
279  if (nal_ref_idc == 0 && abs_frame_num > 0)
280  abs_frame_num--;
281 
282  expected_delta_per_poc_cycle = 0;
283  for (i = 0; i < sps->poc_cycle_length; i++)
284  // FIXME integrate during sps parse
285  expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
286 
287  if (abs_frame_num > 0) {
288  int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
289  int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
290 
291  expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
292  for (i = 0; i <= frame_num_in_poc_cycle; i++)
293  expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
294  } else
295  expectedpoc = 0;
296 
297  if (nal_ref_idc == 0)
298  expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
299 
300  field_poc[0] = expectedpoc + pc->delta_poc[0];
301  field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
302 
303  if (picture_structure == PICT_FRAME)
304  field_poc[1] += pc->delta_poc[1];
305  } else {
306  int poc = 2 * (pc->frame_num_offset + pc->frame_num);
307 
308  if (!nal_ref_idc)
309  poc--;
310 
311  field_poc[0] = poc;
312  field_poc[1] = poc;
313  }
314 
315  if (picture_structure != PICT_BOTTOM_FIELD)
316  pic_field_poc[0] = field_poc[0];
317  if (picture_structure != PICT_TOP_FIELD)
318  pic_field_poc[1] = field_poc[1];
319  *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
320 
321  return 0;
322 }
323 
324 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
325  int is_avc, void *logctx)
326 {
327  H2645Packet pkt = { 0 };
328  int i, ret = 0;
329 
330  ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264);
331  if (ret < 0) {
332  ret = 0;
333  goto fail;
334  }
335 
336  for (i = 0; i < pkt.nb_nals; i++) {
337  H2645NAL *nal = &pkt.nals[i];
338  switch (nal->type) {
339  case NAL_SPS:
340  ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 0);
341  if (ret < 0)
342  goto fail;
343  break;
344  case NAL_PPS:
345  ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
346  nal->size_bits);
347  if (ret < 0)
348  goto fail;
349  break;
350  default:
351  av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
352  nal->type);
353  break;
354  }
355  }
356 
357 fail:
359  return ret;
360 }
361 
362 /* There are (invalid) samples in the wild with mp4-style extradata, where the
363  * parameter sets are stored unescaped (i.e. as RBSP).
364  * This function catches the parameter set decoding failure and tries again
365  * after escaping it */
366 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
367  int err_recognition, void *logctx)
368 {
369  int ret;
370 
371  ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
372  if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
373  GetByteContext gbc;
374  PutByteContext pbc;
375  uint8_t *escaped_buf;
376  int escaped_buf_size;
377 
378  av_log(logctx, AV_LOG_WARNING,
379  "SPS decoding failure, trying again after escaping the NAL\n");
380 
381  if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
382  return AVERROR(ERANGE);
383  escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
384  escaped_buf = av_mallocz(escaped_buf_size);
385  if (!escaped_buf)
386  return AVERROR(ENOMEM);
387 
388  bytestream2_init(&gbc, buf, buf_size);
389  bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
390 
391  while (bytestream2_get_bytes_left(&gbc)) {
392  if (bytestream2_get_bytes_left(&gbc) >= 3 &&
393  bytestream2_peek_be24(&gbc) <= 3) {
394  bytestream2_put_be24(&pbc, 3);
395  bytestream2_skip(&gbc, 2);
396  } else
397  bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
398  }
399 
400  escaped_buf_size = bytestream2_tell_p(&pbc);
401  AV_WB16(escaped_buf, escaped_buf_size - 2);
402 
403  ret = decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
404  av_freep(&escaped_buf);
405  if (ret < 0)
406  return ret;
407  }
408 
409  return 0;
410 }
411 
413  int *is_avc, int *nal_length_size,
414  int err_recognition, void *logctx)
415 {
416  int ret;
417 
418  if (!data || size <= 0)
419  return -1;
420 
421  if (data[0] == 1) {
422  int i, cnt, nalsize;
423  const uint8_t *p = data;
424 
425  *is_avc = 1;
426 
427  if (size < 7) {
428  av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
429  return AVERROR_INVALIDDATA;
430  }
431 
432  // Decode sps from avcC
433  cnt = *(p + 5) & 0x1f; // Number of sps
434  p += 6;
435  for (i = 0; i < cnt; i++) {
436  nalsize = AV_RB16(p) + 2;
437  if (nalsize > size - (p - data))
438  return AVERROR_INVALIDDATA;
439  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
440  if (ret < 0) {
441  av_log(logctx, AV_LOG_ERROR,
442  "Decoding sps %d from avcC failed\n", i);
443  return ret;
444  }
445  p += nalsize;
446  }
447  // Decode pps from avcC
448  cnt = *(p++); // Number of pps
449  for (i = 0; i < cnt; i++) {
450  nalsize = AV_RB16(p) + 2;
451  if (nalsize > size - (p - data))
452  return AVERROR_INVALIDDATA;
453  ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
454  if (ret < 0) {
455  av_log(logctx, AV_LOG_ERROR,
456  "Decoding pps %d from avcC failed\n", i);
457  return ret;
458  }
459  p += nalsize;
460  }
461  // Store right nal length size that will be used to parse all other nals
462  *nal_length_size = (data[4] & 0x03) + 1;
463  } else {
464  *is_avc = 0;
465  ret = decode_extradata_ps(data, size, ps, 0, logctx);
466  if (ret < 0)
467  return ret;
468  }
469  return size;
470 }
471 
472 /**
473  * Compute profile from profile_idc and constraint_set?_flags.
474  *
475  * @param sps SPS
476  *
477  * @return profile as defined by FF_PROFILE_H264_*
478  */
479 int ff_h264_get_profile(const SPS *sps)
480 {
481  int profile = sps->profile_idc;
482 
483  switch (sps->profile_idc) {
485  // constraint_set1_flag set to 1
486  profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
487  break;
491  // constraint_set3_flag set to 1
492  profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
493  break;
494  }
495 
496  return profile;
497 }
int chroma_format_idc
Definition: h264.h:140
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define DC_128_PRED8x8
Definition: h264pred.h:76
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:183
Definition: h264.h:123
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int luma_weight_flag[2]
7.4.3.2 luma_weight_lX_flag
Definition: h264_parse.h:34
static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps, int err_recognition, void *logctx)
Definition: h264_parse.c:366
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:38
Sequence parameter set.
Definition: h264.h:136
#define FF_PROFILE_H264_INTRA
Definition: avcodec.h:3183
unsigned int ref_count[2]
num_ref_idx_l0/1_active_minus1 + 1
Definition: h264.h:206
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:143
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:244
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:248
Picture parameter set.
Definition: h264.h:200
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
int profile_idc
Definition: h264.h:138
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:3195
#define FF_PROFILE_H264_BASELINE
Definition: avcodec.h:3185
uint8_t
int offset_for_non_ref_pic
Definition: h264.h:146
mode
Definition: f_perms.c:27
int frame_num_offset
for POC type 2
Definition: h264_parse.h:50
int chroma_weight_flag[2]
7.4.3.2 chroma_weight_lX_flag
Definition: h264_parse.h:35
#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:367
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:412
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
bitstream reader API header.
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
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:324
ptrdiff_t size
Definition: opengl_enc.c:101
int luma_weight[48][2][2]
Definition: h264_parse.h:37
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
#define av_log(a,...)
H.264 / AVC / MPEG-4 part10 codec.
#define U(x)
Definition: vp56_arith.h:37
int chroma_log2_weight_denom
Definition: h264_parse.h:33
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int get_ue_golomb(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to 8190.
Definition: golomb.h:53
int poc_type
pic_order_cnt_type
Definition: h264.h:143
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:479
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define ALZHEIMER_DC_L0T_PRED8x8
Definition: h264pred.h:79
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define FF_PROFILE_H264_HIGH_422
Definition: avcodec.h:3192
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:193
#define fail()
Definition: checkasm.h:81
int offset_for_top_to_bottom_field
Definition: h264.h:147
static const uint8_t scan8[16 *3+3]
Definition: h264.h:801
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, void *logctx)
Definition: h264_parse.c:191
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, void *logctx)
Definition: h264_parse.c:25
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:48
#define FFMIN(a, b)
Definition: common.h:96
int poc_cycle_length
num_ref_frames_in_pic_order_cnt_cycle
Definition: h264.h:148
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2947
Definition: h264.h:122
#define LEFT_DC_PRED8x8
Definition: h264pred.h:74
int type
NAL unit type.
Definition: h2645_parse.h:50
short offset_for_ref_frame[256]
Definition: h264.h:175
int delta_poc_bottom
Definition: h264_parse.h:45
void * buf
Definition: avisynth_c.h:553
int constraint_set_flags
constraint_set[0-3]_flag
Definition: h264.h:192
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:52
int log2_max_poc_lsb
log2_max_pic_order_cnt_lsb_minus4
Definition: h264.h:144
mfxU16 profile
Definition: qsvenc.c:42
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:49
int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int bit_length)
Decode PPS.
Definition: h264_ps.c:706
if(ret< 0)
Definition: vf_mcdeint.c:282
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.h:142
Bi-dir predicted.
Definition: avutil.h:268
GetBitContext gb
Definition: h2645_parse.h:45
int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int ignore_truncation)
Decode SPS.
Definition: h264_ps.c:318
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:731
int delta_poc[2]
Definition: h264_parse.h:46
#define PICT_FRAME
Definition: mpegutils.h:39
H2645NAL * nals
Definition: h2645_parse.h:68
#define av_freep(p)
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:51
#define FF_PROFILE_H264_CONSTRAINED
Definition: avcodec.h:3182
H.264 decoder/parser shared code.
#define FF_PROFILE_H264_HIGH_10
Definition: avcodec.h:3190
exp golomb vlc stuff
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