FFmpeg: libavformat/riffenc.c Source File

FFmpeg
riffenc.c
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1 /*
2  * RIFF muxing functions
3  * Copyright (c) 2000 Fabrice Bellard
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/channel_layout.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/log.h"
25 #include "libavutil/mathematics.h"
26 #include "libavcodec/bytestream.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "riff.h"
30 
31  int64_t ff_start_tag(AVIOContext *pb, const char *tag)
32 {
33  ffio_wfourcc(pb, tag);
34  avio_wl32(pb, -1);
35  return avio_tell(pb);
36 }
37 
38  void ff_end_tag(AVIOContext *pb, int64_t start)
39 {
40  int64_t pos;
41 
42  av_assert0((start&1) == 0);
43 
44  pos = avio_tell(pb);
45  if (pos & 1)
46  avio_w8(pb, 0);
47  avio_seek(pb, start - 4, SEEK_SET);
48  avio_wl32(pb, (uint32_t)(pos - start));
49  avio_seek(pb, FFALIGN(pos, 2), SEEK_SET);
50 }
51 
52 /* WAVEFORMATEX header */
53 /* returns the size or -1 on error */
54  int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb,
55  AVCodecParameters *par, int flags)
56 {
57  int bps, blkalign, bytespersec, frame_size;
58  int hdrsize;
59  int64_t hdrstart = avio_tell(pb);
60  int waveformatextensible;
61  uint8_t temp[256];
62  uint8_t *riff_extradata = temp;
63  uint8_t *riff_extradata_start = temp;
64 
65  if (!par->codec_tag || par->codec_tag > 0xffff)
66  return -1;
67 
68  if (par->codec_id == AV_CODEC_ID_ADPCM_SWF && par->block_align == 0) {
69  av_log(s, AV_LOG_ERROR, "%s can only be written to WAVE with a constant frame size\n",
70  avcodec_get_name(par->codec_id));
71  return AVERROR(EINVAL);
72  }
73 
74  /* We use the known constant frame size for the codec if known, otherwise
75  * fall back on using AVCodecContext.frame_size, which is not as reliable
76  * for indicating packet duration. */
77  frame_size = av_get_audio_frame_duration2(par, par->block_align);
78 
79  waveformatextensible = (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE &&
80  av_channel_layout_compare(&par->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_MONO) &&
81  av_channel_layout_compare(&par->ch_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) ||
82  par->sample_rate > 48000 ||
83  par->codec_id == AV_CODEC_ID_EAC3 || par->codec_id == AV_CODEC_ID_DFPWM ||
84  av_get_bits_per_sample(par->codec_id) > 16;
85 
86  if (waveformatextensible)
87  avio_wl16(pb, 0xfffe);
88  else
89  avio_wl16(pb, par->codec_tag);
90 
91  avio_wl16(pb, par->ch_layout.nb_channels);
92  avio_wl32(pb, par->sample_rate);
93  if (par->codec_id == AV_CODEC_ID_ATRAC3 ||
94  par->codec_id == AV_CODEC_ID_G723_1 ||
95  par->codec_id == AV_CODEC_ID_MP2 ||
96  par->codec_id == AV_CODEC_ID_MP3 ||
97  par->codec_id == AV_CODEC_ID_GSM_MS) {
98  bps = 0;
99  } else {
100  if (!(bps = av_get_bits_per_sample(par->codec_id))) {
101  if (par->bits_per_coded_sample)
102  bps = par->bits_per_coded_sample;
103  else
104  bps = 16; // default to 16
105  }
106  }
107  if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
108  av_log(s, AV_LOG_WARNING,
109  "requested bits_per_coded_sample (%d) "
110  "and actually stored (%d) differ\n",
111  par->bits_per_coded_sample, bps);
112  }
113 
114  if (par->codec_id == AV_CODEC_ID_MP2) {
115  blkalign = (144 * par->bit_rate - 1)/par->sample_rate + 1;
116  } else if (par->codec_id == AV_CODEC_ID_MP3) {
117  blkalign = 576 * (par->sample_rate <= (24000 + 32000)/2 ? 1 : 2);
118  } else if (par->codec_id == AV_CODEC_ID_AC3) {
119  blkalign = 3840; /* maximum bytes per frame */
120  } else if (par->codec_id == AV_CODEC_ID_AAC) {
121  blkalign = 768 * par->ch_layout.nb_channels; /* maximum bytes per frame */
122  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
123  blkalign = 24;
124  } else if (par->block_align != 0) { /* specified by the codec */
125  blkalign = par->block_align;
126  } else
127  blkalign = bps * par->ch_layout.nb_channels / av_gcd(8, bps);
128  if (par->codec_id == AV_CODEC_ID_PCM_U8 ||
129  par->codec_id == AV_CODEC_ID_PCM_S24LE ||
130  par->codec_id == AV_CODEC_ID_PCM_S32LE ||
131  par->codec_id == AV_CODEC_ID_PCM_F32LE ||
132  par->codec_id == AV_CODEC_ID_PCM_F64LE ||
133  par->codec_id == AV_CODEC_ID_PCM_S16LE) {
134  bytespersec = par->sample_rate * blkalign;
135  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
136  bytespersec = 800;
137  } else {
138  bytespersec = par->bit_rate / 8;
139  }
140  avio_wl32(pb, bytespersec); /* bytes per second */
141  avio_wl16(pb, blkalign); /* block align */
142  avio_wl16(pb, bps); /* bits per sample */
143  if (par->codec_id == AV_CODEC_ID_MP3) {
144  bytestream_put_le16(&riff_extradata, 1); /* wID */
145  bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
146  bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
147  bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
148  bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
149  } else if (par->codec_id == AV_CODEC_ID_MP2) {
150  /* fwHeadLayer */
151  bytestream_put_le16(&riff_extradata, 2);
152  /* dwHeadBitrate */
153  bytestream_put_le32(&riff_extradata, par->bit_rate);
154  /* fwHeadMode */
155  bytestream_put_le16(&riff_extradata, par->ch_layout.nb_channels == 2 ? 1 : 8);
156  /* fwHeadModeExt */
157  bytestream_put_le16(&riff_extradata, 0);
158  /* wHeadEmphasis */
159  bytestream_put_le16(&riff_extradata, 1);
160  /* fwHeadFlags */
161  bytestream_put_le16(&riff_extradata, 16);
162  /* dwPTSLow */
163  bytestream_put_le32(&riff_extradata, 0);
164  /* dwPTSHigh */
165  bytestream_put_le32(&riff_extradata, 0);
166  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
167  bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */
168  bytestream_put_le32(&riff_extradata, 0xaea2f732);
169  bytestream_put_le16(&riff_extradata, 0xacde);
170  } else if (par->codec_id == AV_CODEC_ID_GSM_MS ||
171  par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
172  /* wSamplesPerBlock */
173  bytestream_put_le16(&riff_extradata, frame_size);
174  } else if (par->extradata_size) {
175  riff_extradata_start = par->extradata;
176  riff_extradata = par->extradata + par->extradata_size;
177  }
178  /* write WAVEFORMATEXTENSIBLE extensions */
179  if (waveformatextensible) {
180  int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) &&
181  (s->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
182  par->ch_layout.u.mask < 0x40000);
183  /* 22 is WAVEFORMATEXTENSIBLE size */
184  avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
185  /* ValidBitsPerSample || SamplesPerBlock || Reserved */
186  avio_wl16(pb, bps);
187  /* dwChannelMask */
188  avio_wl32(pb, write_channel_mask ? par->ch_layout.u.mask : 0);
189  /* GUID + next 3 */
190  if (par->codec_id == AV_CODEC_ID_EAC3 || par->codec_id == AV_CODEC_ID_DFPWM) {
191  ff_put_guid(pb, ff_get_codec_guid(par->codec_id, ff_codec_wav_guids));
192  } else {
193  avio_wl32(pb, par->codec_tag);
194  avio_wl32(pb, 0x00100000);
195  avio_wl32(pb, 0xAA000080);
196  avio_wl32(pb, 0x719B3800);
197  }
198  } else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) ||
199  par->codec_tag != 0x0001 /* PCM */ ||
200  riff_extradata - riff_extradata_start) {
201  /* WAVEFORMATEX */
202  avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
203  } /* else PCMWAVEFORMAT */
204  avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
205  hdrsize = avio_tell(pb) - hdrstart;
206  if (hdrsize & 1) {
207  hdrsize++;
208  avio_w8(pb, 0);
209  }
210 
211  return hdrsize;
212 }
213 
214 /* BITMAPINFOHEADER header */
215  void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
216  int for_asf, int ignore_extradata, int rgb_frame_is_flipped)
217 {
218  int flipped_extradata = (par->extradata_size >= 9 &&
219  !memcmp(par->extradata + par->extradata_size - 9, "BottomUp", 9));
220  int keep_height = flipped_extradata || rgb_frame_is_flipped;
221  int extradata_size = par->extradata_size - 9*flipped_extradata;
222  enum AVPixelFormat pix_fmt = par->format;
223  int pal_avi;
224 
225  if (pix_fmt == AV_PIX_FMT_NONE && par->bits_per_coded_sample == 1)
226  pix_fmt = AV_PIX_FMT_MONOWHITE;
227  pal_avi = !for_asf &&
228  (pix_fmt == AV_PIX_FMT_PAL8 ||
229  pix_fmt == AV_PIX_FMT_MONOWHITE ||
230  pix_fmt == AV_PIX_FMT_MONOBLACK);
231 
232  /* Size (not including the size of the color table or color masks) */
233  avio_wl32(pb, 40 + (ignore_extradata || pal_avi ? 0 : extradata_size));
234  avio_wl32(pb, par->width);
235  //We always store RGB TopDown
236  avio_wl32(pb, par->codec_tag || keep_height ? par->height : -par->height);
237  /* planes */
238  avio_wl16(pb, 1);
239  /* depth */
240  avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24);
241  /* compression type */
242  avio_wl32(pb, par->codec_tag);
243  avio_wl32(pb, (par->width * par->height * (par->bits_per_coded_sample ? par->bits_per_coded_sample : 24)+7) / 8);
244  avio_wl32(pb, 0);
245  avio_wl32(pb, 0);
246  /* Number of color indices in the color table that are used.
247  * A value of 0 means 2^biBitCount indices, but this doesn't work
248  * with Windows Media Player and files containing xxpc chunks. */
249  avio_wl32(pb, pal_avi ? 1 << par->bits_per_coded_sample : 0);
250  avio_wl32(pb, 0);
251 
252  if (!ignore_extradata) {
253  if (par->extradata_size) {
254  avio_write(pb, par->extradata, extradata_size);
255  if (!for_asf && extradata_size & 1)
256  avio_w8(pb, 0);
257  } else if (pal_avi) {
258  int i;
259  for (i = 0; i < 1 << par->bits_per_coded_sample; i++) {
260  /* Initialize 1 bpp palette to black & white */
261  if (i == 0 && pix_fmt == AV_PIX_FMT_MONOWHITE)
262  avio_wl32(pb, 0xffffff);
263  else if (i == 1 && pix_fmt == AV_PIX_FMT_MONOBLACK)
264  avio_wl32(pb, 0xffffff);
265  else
266  avio_wl32(pb, 0);
267  }
268  }
269  }
270 }
271 
272  void ff_parse_specific_params(AVStream *st, int *au_rate,
273  int *au_ssize, int *au_scale)
274 {
275  AVCodecParameters *par = st->codecpar;
276  int gcd;
277  int audio_frame_size;
278 
279  audio_frame_size = av_get_audio_frame_duration2(par, 0);
280  if (!audio_frame_size)
281  audio_frame_size = par->frame_size;
282 
283  *au_ssize = par->block_align;
284  if (audio_frame_size && par->sample_rate) {
285  *au_scale = audio_frame_size;
286  *au_rate = par->sample_rate;
287  } else if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
288  par->codec_type == AVMEDIA_TYPE_DATA ||
289  par->codec_type == AVMEDIA_TYPE_SUBTITLE) {
290  *au_scale = st->time_base.num;
291  *au_rate = st->time_base.den;
292  } else {
293  *au_scale = par->block_align ? par->block_align * 8 : 8;
294  *au_rate = par->bit_rate ? par->bit_rate :
295  8 * par->sample_rate;
296  }
297  gcd = av_gcd(*au_scale, *au_rate);
298  *au_scale /= gcd;
299  *au_rate /= gcd;
300 }
301 
302  void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
303 {
304  size_t len = strlen(str);
305  if (len > 0 && len < UINT32_MAX) {
306  len++;
307  ffio_wfourcc(pb, tag);
308  avio_wl32(pb, len);
309  avio_put_str(pb, str);
310  if (len & 1)
311  avio_w8(pb, 0);
312  }
313 }
314 
315  static const char riff_tags[][5] = {
316  "IARL", "IART", "IAS1", "IAS2", "IAS3", "IAS4", "IAS5", "IAS6", "IAS7",
317  "IAS8", "IAS9", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
318  "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
319  "IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
320  { 0 }
321 };
322 
323  static int riff_has_valid_tags(AVFormatContext *s)
324 {
325  int i;
326 
327  for (i = 0; *riff_tags[i]; i++)
328  if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
329  return 1;
330 
331  return 0;
332 }
333 
334  void ff_riff_write_info(AVFormatContext *s)
335 {
336  AVIOContext *pb = s->pb;
337  int i;
338  int64_t list_pos;
339  AVDictionaryEntry *t = NULL;
340 
341  ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
342 
343  /* writing empty LIST is not nice and may cause problems */
344  if (!riff_has_valid_tags(s))
345  return;
346 
347  list_pos = ff_start_tag(pb, "LIST");
348  ffio_wfourcc(pb, "INFO");
349  for (i = 0; *riff_tags[i]; i++)
350  if ((t = av_dict_get(s->metadata, riff_tags[i],
351  NULL, AV_DICT_MATCH_CASE)))
352  ff_riff_write_info_tag(s->pb, t->key, t->value);
353  ff_end_tag(pb, list_pos);
354 }
355 
356  void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
357 {
358  av_assert0(sizeof(*g) == 16);
359  avio_write(s, *g, sizeof(*g));
360 }
361 
362  const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
363 {
364  int i;
365  for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) {
366  if (id == av_guid[i].id)
367  return &(av_guid[i].guid);
368  }
369  return NULL;
370 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:326
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:76
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AV_CODEC_ID_AC3
@ AV_CODEC_ID_AC3
Definition: codec_id.h:441
AVERROR
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
ffio_wfourcc
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:116
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:369
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:54
ff_metadata_conv
void ff_metadata_conv(AVDictionary **pm, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:26
ff_parse_specific_params
void ff_parse_specific_params(AVStream *st, int *au_rate, int *au_ssize, int *au_scale)
Definition: riffenc.c:272
AV_PIX_FMT_MONOWHITE
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:75
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:66
mathematics.h
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
AVChannelLayout::mask
uint64_t mask
This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used for AV_CHANNEL_ORDER_AMBISONIC ...
Definition: channel_layout.h:333
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
ff_put_guid
void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
Definition: riffenc.c:356
av_gcd
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
Definition: mathematics.c:37
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:458
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:500
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:439
AVRational::num
int num
Numerator.
Definition: rational.h:59
AV_CODEC_ID_ATRAC3
@ AV_CODEC_ID_ATRAC3
Definition: codec_id.h:469
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:583
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
ff_get_codec_guid
const ff_asf_guid * ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
Definition: riffenc.c:362
AVCodecParameters::frame_size
int frame_size
Audio only.
Definition: codec_par.h:189
av_dict_get
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:60
s
#define s(width, name)
Definition: cbs_vp9.c:256
g
const char * g
Definition: vf_curves.c:127
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
AVDictionaryEntry::key
char * key
Definition: dict.h:90
frame_size
int frame_size
Definition: mxfenc.c:2205
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:128
AV_CODEC_ID_MP2
@ AV_CODEC_ID_MP2
Definition: codec_id.h:438
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVMEDIA_TYPE_DATA
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:203
ff_riff_write_info
void ff_riff_write_info(AVFormatContext *s)
Write all recognized RIFF tags from s->metadata.
Definition: riffenc.c:334
AVFormatContext
Format I/O context.
Definition: avformat.h:1104
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:861
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:877
NULL
#define NULL
Definition: coverity.c:32
ff_asf_guid
uint8_t ff_asf_guid[16]
Definition: riff.h:95
ff_put_bmp_header
void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par, int for_asf, int ignore_extradata, int rgb_frame_is_flipped)
Definition: riffenc.c:215
AV_PIX_FMT_MONOBLACK
@ AV_PIX_FMT_MONOBLACK
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:76
AV_CODEC_ID_G723_1
@ AV_CODEC_ID_G723_1
Definition: codec_id.h:490
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:200
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:213
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:178
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
AV_CODEC_ID_EAC3
@ AV_CODEC_ID_EAC3
Definition: codec_id.h:478
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:80
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:440
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
AV_CODEC_ID_PCM_S24LE
@ AV_CODEC_ID_PCM_S24LE
Definition: codec_id.h:338
ff_end_tag
void ff_end_tag(AVIOContext *pb, int64_t start)
Definition: riffenc.c:38
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:301
AVCodecGuid::id
enum AVCodecID id
Definition: riff.h:98
bps
unsigned bps
Definition: movenc.c:1642
AV_CODEC_ID_ADPCM_SWF
@ AV_CODEC_ID_ADPCM_SWF
Definition: codec_id.h:378
AVCodecGuid
Definition: riff.h:97
FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX
#define FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX
Tell ff_put_wav_header() to use WAVEFORMATEX even for PCM codecs.
Definition: riff.h:53
av_get_audio_frame_duration2
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:837
ff_riff_info_conv
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:616
FF_PUT_WAV_HEADER_SKIP_CHANNELMASK
#define FF_PUT_WAV_HEADER_SKIP_CHANNELMASK
Tell ff_put_wav_header() to write an empty channel mask.
Definition: riff.h:58
ff_riff_write_info_tag
void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
Write a single RIFF info tag.
Definition: riffenc.c:302
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:222
FF_COMPLIANCE_NORMAL
#define FF_COMPLIANCE_NORMAL
Definition: defs.h:60
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:378
AV_CHANNEL_ORDER_NATIVE
@ AV_CHANNEL_ORDER_NATIVE
The native channel order, i.e.
Definition: channel_layout.h:118
av_channel_layout_compare
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1)
Check whether two channel layouts are semantically the same, i.e.
Definition: channel_layout.c:932
avcodec_get_name
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:442
riff_tags
static const char riff_tags[][5]
Definition: riffenc.c:315
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
avio_internal.h
ff_start_tag
int64_t ff_start_tag(AVIOContext *pb, const char *tag)
Definition: riffenc.c:31
AVCodecParameters::height
int height
Definition: codec_par.h:129
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
riff_has_valid_tags
static int riff_has_valid_tags(AVFormatContext *s)
Definition: riffenc.c:323
len
int len
Definition: vorbis_enc_data.h:426
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
AV_CODEC_ID_GSM_MS
@ AV_CODEC_ID_GSM_MS
Definition: codec_id.h:468
tag
uint32_t tag
Definition: movenc.c:1641
AVStream
Stream structure.
Definition: avformat.h:838
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:252
pos
unsigned int pos
Definition: spdifenc.c:413
avformat.h
dict.h
AV_DICT_MATCH_CASE
#define AV_DICT_MATCH_CASE
Only get an entry with exact-case key match.
Definition: dict.h:74
channel_layout.h
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
temp
else temp
Definition: vf_mcdeint.c:248
ff_put_wav_header
int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int flags)
Write WAVEFORMAT header structure.
Definition: riffenc.c:54
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_CODEC_ID_PCM_S32LE
@ AV_CODEC_ID_PCM_S32LE
Definition: codec_id.h:334
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:104
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:331
AVCodecParameters::format
int format
Definition: codec_par.h:86
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:368
AV_CODEC_ID_PCM_F64LE
@ AV_CODEC_ID_PCM_F64LE
Definition: codec_id.h:349
AVDictionaryEntry
Definition: dict.h:89
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:366
riff.h
ff_codec_wav_guids
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:643
bytestream.h
convert_header.str
string str
Definition: convert_header.py:20
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVChannelLayout::u
union AVChannelLayout::@314 u
Details about which channels are present in this layout.
AV_CODEC_ID_DFPWM
@ AV_CODEC_ID_DFPWM
Definition: codec_id.h:534
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:347
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:91
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVCodecGuid::guid
ff_asf_guid guid
Definition: riff.h:99
AVDictionaryEntry::value
char * value
Definition: dict.h:91
avio_put_str
int avio_put_str(AVIOContext *s, const char *str)
Write a NULL-terminated string.
Definition: aviobuf.c:394
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