FFmpeg  4.2.3
avc.c
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1 /*
2  * AVC helper functions for muxers
3  * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
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 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/h264.h"
24 #include "libavcodec/get_bits.h"
25 #include "avformat.h"
26 #include "avio.h"
27 #include "avc.h"
28 
29 static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
30 {
31  const uint8_t *a = p + 4 - ((intptr_t)p & 3);
32 
33  for (end -= 3; p < a && p < end; p++) {
34  if (p[0] == 0 && p[1] == 0 && p[2] == 1)
35  return p;
36  }
37 
38  for (end -= 3; p < end; p += 4) {
39  uint32_t x = *(const uint32_t*)p;
40 // if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
41 // if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
42  if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
43  if (p[1] == 0) {
44  if (p[0] == 0 && p[2] == 1)
45  return p;
46  if (p[2] == 0 && p[3] == 1)
47  return p+1;
48  }
49  if (p[3] == 0) {
50  if (p[2] == 0 && p[4] == 1)
51  return p+2;
52  if (p[4] == 0 && p[5] == 1)
53  return p+3;
54  }
55  }
56  }
57 
58  for (end += 3; p < end; p++) {
59  if (p[0] == 0 && p[1] == 0 && p[2] == 1)
60  return p;
61  }
62 
63  return end + 3;
64 }
65 
66 const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
68  if(p<out && out<end && !out[-1]) out--;
69  return out;
70 }
71 
72 int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
73 {
74  const uint8_t *p = buf_in;
75  const uint8_t *end = p + size;
76  const uint8_t *nal_start, *nal_end;
77 
78  size = 0;
79  nal_start = ff_avc_find_startcode(p, end);
80  for (;;) {
81  while (nal_start < end && !*(nal_start++));
82  if (nal_start == end)
83  break;
84 
85  nal_end = ff_avc_find_startcode(nal_start, end);
86  avio_wb32(pb, nal_end - nal_start);
87  avio_write(pb, nal_start, nal_end - nal_start);
88  size += 4 + nal_end - nal_start;
89  nal_start = nal_end;
90  }
91  return size;
92 }
93 
94 int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
95 {
96  AVIOContext *pb;
97  int ret = avio_open_dyn_buf(&pb);
98  if(ret < 0)
99  return ret;
100 
101  ff_avc_parse_nal_units(pb, buf_in, *size);
102 
103  av_freep(buf);
104  *size = avio_close_dyn_buf(pb, buf);
105  return 0;
106 }
107 
109 {
110  AVIOContext *sps_pb = NULL, *pps_pb = NULL;
111  uint8_t *buf = NULL, *end, *start = NULL;
112  uint8_t *sps = NULL, *pps = NULL;
113  uint32_t sps_size = 0, pps_size = 0;
114  int ret, nb_sps = 0, nb_pps = 0;
115 
116  if (len <= 6)
117  return AVERROR_INVALIDDATA;
118 
119  /* check for H.264 start code */
120  if (AV_RB32(data) != 0x00000001 &&
121  AV_RB24(data) != 0x000001) {
122  avio_write(pb, data, len);
123  return 0;
124  }
125 
126  ret = ff_avc_parse_nal_units_buf(data, &buf, &len);
127  if (ret < 0)
128  return ret;
129  start = buf;
130  end = buf + len;
131 
132  ret = avio_open_dyn_buf(&sps_pb);
133  if (ret < 0)
134  goto fail;
135  ret = avio_open_dyn_buf(&pps_pb);
136  if (ret < 0)
137  goto fail;
138 
139  /* look for sps and pps */
140  while (end - buf > 4) {
141  uint32_t size;
142  uint8_t nal_type;
143  size = FFMIN(AV_RB32(buf), end - buf - 4);
144  buf += 4;
145  nal_type = buf[0] & 0x1f;
146 
147  if (nal_type == 7) { /* SPS */
148  nb_sps++;
149  if (size > UINT16_MAX || nb_sps >= H264_MAX_SPS_COUNT) {
150  ret = AVERROR_INVALIDDATA;
151  goto fail;
152  }
153  avio_wb16(sps_pb, size);
154  avio_write(sps_pb, buf, size);
155  } else if (nal_type == 8) { /* PPS */
156  nb_pps++;
157  if (size > UINT16_MAX || nb_pps >= H264_MAX_PPS_COUNT) {
158  ret = AVERROR_INVALIDDATA;
159  goto fail;
160  }
161  avio_wb16(pps_pb, size);
162  avio_write(pps_pb, buf, size);
163  }
164 
165  buf += size;
166  }
167  sps_size = avio_close_dyn_buf(sps_pb, &sps);
168  pps_size = avio_close_dyn_buf(pps_pb, &pps);
169 
170  if (sps_size < 6 || !pps_size) {
171  ret = AVERROR_INVALIDDATA;
172  goto fail;
173  }
174 
175  avio_w8(pb, 1); /* version */
176  avio_w8(pb, sps[3]); /* profile */
177  avio_w8(pb, sps[4]); /* profile compat */
178  avio_w8(pb, sps[5]); /* level */
179  avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
180  avio_w8(pb, 0xe0 | nb_sps); /* 3 bits reserved (111) + 5 bits number of sps */
181 
182  avio_write(pb, sps, sps_size);
183  avio_w8(pb, nb_pps); /* number of pps */
184  avio_write(pb, pps, pps_size);
185 
186 fail:
187  if (!sps)
188  avio_close_dyn_buf(sps_pb, &sps);
189  if (!pps)
190  avio_close_dyn_buf(pps_pb, &pps);
191  av_free(sps);
192  av_free(pps);
193  av_free(start);
194 
195  return ret;
196 }
197 
199 {
200  uint16_t sps_size, pps_size;
201  uint8_t *out;
202  int out_size;
203 
204  *buf = NULL;
205  if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
206  return 0;
207  if (*size < 11 || in[0] != 1)
208  return AVERROR_INVALIDDATA;
209 
210  sps_size = AV_RB16(&in[6]);
211  if (11 + sps_size > *size)
212  return AVERROR_INVALIDDATA;
213  pps_size = AV_RB16(&in[9 + sps_size]);
214  if (11 + sps_size + pps_size > *size)
215  return AVERROR_INVALIDDATA;
216  out_size = 8 + sps_size + pps_size;
217  out = av_mallocz(out_size + AV_INPUT_BUFFER_PADDING_SIZE);
218  if (!out)
219  return AVERROR(ENOMEM);
220  AV_WB32(&out[0], 0x00000001);
221  memcpy(out + 4, &in[8], sps_size);
222  AV_WB32(&out[4 + sps_size], 0x00000001);
223  memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
224  *buf = out;
225  *size = out_size;
226  return 0;
227 }
228 
230  const uint8_t *end,
231  int nal_length_size)
232 {
233  unsigned int res = 0;
234 
235  if (end - start < nal_length_size)
236  return NULL;
237  while (nal_length_size--)
238  res = (res << 8) | *start++;
239 
240  if (res > end - start)
241  return NULL;
242 
243  return start + res;
244 }
245 
246 uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len,
247  uint32_t *dst_len, int header_len)
248 {
249  uint8_t *dst;
250  uint32_t i, len;
251 
252  dst = av_malloc(src_len + AV_INPUT_BUFFER_PADDING_SIZE);
253  if (!dst)
254  return NULL;
255 
256  /* NAL unit header */
257  i = len = 0;
258  while (i < header_len && i < src_len)
259  dst[len++] = src[i++];
260 
261  while (i + 2 < src_len)
262  if (!src[i] && !src[i + 1] && src[i + 2] == 3) {
263  dst[len++] = src[i++];
264  dst[len++] = src[i++];
265  i++; // remove emulation_prevention_three_byte
266  } else
267  dst[len++] = src[i++];
268 
269  while (i < src_len)
270  dst[len++] = src[i++];
271 
272  memset(dst + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
273 
274  *dst_len = len;
275  return dst;
276 }
277 
279  { 0, 1 },
280  { 1, 1 },
281  { 12, 11 },
282  { 10, 11 },
283  { 16, 11 },
284  { 40, 33 },
285  { 24, 11 },
286  { 20, 11 },
287  { 32, 11 },
288  { 80, 33 },
289  { 18, 11 },
290  { 15, 11 },
291  { 64, 33 },
292  { 160, 99 },
293  { 4, 3 },
294  { 3, 2 },
295  { 2, 1 },
296 };
297 
298 static inline int get_ue_golomb(GetBitContext *gb) {
299  int i;
300  for (i = 0; i < 32 && !get_bits1(gb); i++)
301  ;
302  return get_bitsz(gb, i) + (1 << i) - 1;
303 }
304 
305 static inline int get_se_golomb(GetBitContext *gb) {
306  int v = get_ue_golomb(gb) + 1;
307  int sign = -(v & 1);
308  return ((v >> 1) ^ sign) - sign;
309 }
310 
312 {
313  int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
314  int num_ref_frames_in_pic_order_cnt_cycle;
315  int delta_scale, lastScale = 8, nextScale = 8;
316  int sizeOfScalingList;
318  GetBitContext gb;
319  uint8_t *rbsp_buf;
320 
321  rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0);
322  if (!rbsp_buf)
323  return NULL;
324 
325  ret = init_get_bits8(&gb, rbsp_buf, rbsp_size);
326  if (ret < 0)
327  goto end;
328 
329  sps = av_mallocz(sizeof(*sps));
330  if (!sps)
331  goto end;
332 
333  sps->profile_idc = get_bits(&gb, 8);
334  sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag
335  sps->constraint_set_flags |= get_bits1(&gb) << 1; // constraint_set1_flag
336  sps->constraint_set_flags |= get_bits1(&gb) << 2; // constraint_set2_flag
337  sps->constraint_set_flags |= get_bits1(&gb) << 3; // constraint_set3_flag
338  sps->constraint_set_flags |= get_bits1(&gb) << 4; // constraint_set4_flag
339  sps->constraint_set_flags |= get_bits1(&gb) << 5; // constraint_set5_flag
340  skip_bits(&gb, 2); // reserved_zero_2bits
341  sps->level_idc = get_bits(&gb, 8);
342  sps->id = get_ue_golomb(&gb);
343 
344  if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
345  sps->profile_idc == 122 || sps->profile_idc == 244 || sps->profile_idc == 44 ||
346  sps->profile_idc == 83 || sps->profile_idc == 86 || sps->profile_idc == 118 ||
347  sps->profile_idc == 128 || sps->profile_idc == 138 || sps->profile_idc == 139 ||
348  sps->profile_idc == 134) {
349  sps->chroma_format_idc = get_ue_golomb(&gb); // chroma_format_idc
350  if (sps->chroma_format_idc == 3) {
351  skip_bits1(&gb); // separate_colour_plane_flag
352  }
353  sps->bit_depth_luma = get_ue_golomb(&gb) + 8;
354  get_ue_golomb(&gb); // bit_depth_chroma_minus8
355  skip_bits1(&gb); // qpprime_y_zero_transform_bypass_flag
356  if (get_bits1(&gb)) { // seq_scaling_matrix_present_flag
357  for (i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++) {
358  if (!get_bits1(&gb)) // seq_scaling_list_present_flag
359  continue;
360  lastScale = 8;
361  nextScale = 8;
362  sizeOfScalingList = i < 6 ? 16 : 64;
363  for (j = 0; j < sizeOfScalingList; j++) {
364  if (nextScale != 0) {
365  delta_scale = get_se_golomb(&gb);
366  nextScale = (lastScale + delta_scale) & 0xff;
367  }
368  lastScale = nextScale == 0 ? lastScale : nextScale;
369  }
370  }
371  }
372  } else {
373  sps->chroma_format_idc = 1;
374  sps->bit_depth_luma = 8;
375  }
376 
377  get_ue_golomb(&gb); // log2_max_frame_num_minus4
378  pic_order_cnt_type = get_ue_golomb(&gb);
379 
380  if (pic_order_cnt_type == 0) {
381  get_ue_golomb(&gb); // log2_max_pic_order_cnt_lsb_minus4
382  } else if (pic_order_cnt_type == 1) {
383  skip_bits1(&gb); // delta_pic_order_always_zero
384  get_se_golomb(&gb); // offset_for_non_ref_pic
385  get_se_golomb(&gb); // offset_for_top_to_bottom_field
386  num_ref_frames_in_pic_order_cnt_cycle = get_ue_golomb(&gb);
387  for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++)
388  get_se_golomb(&gb); // offset_for_ref_frame
389  }
390 
391  get_ue_golomb(&gb); // max_num_ref_frames
392  skip_bits1(&gb); // gaps_in_frame_num_value_allowed_flag
393  get_ue_golomb(&gb); // pic_width_in_mbs_minus1
394  get_ue_golomb(&gb); // pic_height_in_map_units_minus1
395 
396  sps->frame_mbs_only_flag = get_bits1(&gb);
397  if (!sps->frame_mbs_only_flag)
398  skip_bits1(&gb); // mb_adaptive_frame_field_flag
399 
400  skip_bits1(&gb); // direct_8x8_inference_flag
401 
402  if (get_bits1(&gb)) { // frame_cropping_flag
403  get_ue_golomb(&gb); // frame_crop_left_offset
404  get_ue_golomb(&gb); // frame_crop_right_offset
405  get_ue_golomb(&gb); // frame_crop_top_offset
406  get_ue_golomb(&gb); // frame_crop_bottom_offset
407  }
408 
409  if (get_bits1(&gb)) { // vui_parameters_present_flag
410  if (get_bits1(&gb)) { // aspect_ratio_info_present_flag
411  aspect_ratio_idc = get_bits(&gb, 8);
412  if (aspect_ratio_idc == 0xff) {
413  sps->sar.num = get_bits(&gb, 16);
414  sps->sar.den = get_bits(&gb, 16);
415  } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) {
416  sps->sar = avc_sample_aspect_ratio[aspect_ratio_idc];
417  }
418  }
419  }
420 
421  if (!sps->sar.den) {
422  sps->sar.num = 1;
423  sps->sar.den = 1;
424  }
425 
426  end:
427  av_free(rbsp_buf);
428  return sps;
429 }
uint8_t chroma_format_idc
Definition: avc.h:44
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int get_se_golomb(GetBitContext *gb)
Definition: avc.c:305
Buffered I/O operations.
int size
const uint8_t * ff_avc_find_startcode(const uint8_t *p, const uint8_t *end)
Definition: avc.c:66
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1415
static int get_ue_golomb(GetBitContext *gb)
Definition: avc.c:298
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
int num
Numerator.
Definition: rational.h:59
#define AV_RB24
Definition: intreadwrite.h:64
int out_size
Definition: movenc.c:55
uint8_t level_idc
Definition: avc.h:42
#define src
Definition: vp8dsp.c:254
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1386
uint8_t bit_depth_luma
Definition: avc.h:45
static const AVRational avc_sample_aspect_ratio[17]
Definition: avc.c:278
uint8_t
#define av_malloc(s)
#define AV_RB32
Definition: intreadwrite.h:130
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
const char data[16]
Definition: mxf.c:91
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
Definition: avc.c:198
bitstream reader API header.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
H.264 common definitions.
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
Definition: avc.c:94
#define fail()
Definition: checkasm.h:120
int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
Definition: avc.c:72
#define FFMIN(a, b)
Definition: common.h:96
uint8_t frame_mbs_only_flag
Definition: avc.h:46
static const uint8_t * ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
Definition: avc.c:29
uint8_t constraint_set_flags
Definition: avc.h:43
uint8_t * ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len, uint32_t *dst_len, int header_len)
Definition: avc.c:246
#define FF_ARRAY_ELEMS(a)
AVRational sar
Definition: avc.h:47
uint8_t profile_idc
Definition: avc.h:41
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:196
void * buf
Definition: avisynth_c.h:766
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
Rational number (pair of numerator and denominator).
Definition: rational.h:58
const uint8_t * ff_avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size)
Definition: avc.c:229
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:475
Main libavformat public API header.
H264SequenceParameterSet * ff_avc_decode_sps(const uint8_t *buf, int buf_size)
Definition: avc.c:311
int den
Denominator.
Definition: rational.h:60
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:790
#define av_free(p)
int len
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:377
FILE * out
Definition: movenc.c:54
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:766
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
Definition: avc.c:108
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415