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 AVCodecParameters.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 && par->codec_tag != 0x0003);
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_G728 ||
96  par->codec_id == AV_CODEC_ID_MP2 ||
97  par->codec_id == AV_CODEC_ID_MP3 ||
98  par->codec_id == AV_CODEC_ID_GSM_MS) {
99  bps = 0;
100  } else {
101  if (!(bps = av_get_bits_per_sample(par->codec_id))) {
102  if (par->bits_per_coded_sample)
103  bps = par->bits_per_coded_sample;
104  else
105  bps = 16; // default to 16
106  }
107  }
108  if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
109  av_log(s, AV_LOG_WARNING,
110  "requested bits_per_coded_sample (%d) "
111  "and actually stored (%d) differ\n",
112  par->bits_per_coded_sample, bps);
113  }
114 
115  if (par->codec_id == AV_CODEC_ID_MP2) {
116  blkalign = (144 * par->bit_rate - 1)/par->sample_rate + 1;
117  } else if (par->codec_id == AV_CODEC_ID_MP3) {
118  blkalign = 576 * (par->sample_rate <= (24000 + 32000)/2 ? 1 : 2);
119  } else if (par->codec_id == AV_CODEC_ID_AC3) {
120  blkalign = 3840; /* maximum bytes per frame */
121  } else if (par->codec_id == AV_CODEC_ID_AAC) {
122  blkalign = 768 * par->ch_layout.nb_channels; /* maximum bytes per frame */
123  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
124  blkalign = 24;
125  } else if (par->block_align != 0) { /* specified by the codec */
126  blkalign = par->block_align;
127  } else
128  blkalign = bps * par->ch_layout.nb_channels / av_gcd(8, bps);
129  if (par->codec_id == AV_CODEC_ID_PCM_U8 ||
130  par->codec_id == AV_CODEC_ID_PCM_S24LE ||
131  par->codec_id == AV_CODEC_ID_PCM_S32LE ||
132  par->codec_id == AV_CODEC_ID_PCM_F32LE ||
133  par->codec_id == AV_CODEC_ID_PCM_F64LE ||
134  par->codec_id == AV_CODEC_ID_PCM_S16LE) {
135  bytespersec = par->sample_rate * blkalign;
136  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
137  bytespersec = 800;
138  } else {
139  bytespersec = par->bit_rate / 8;
140  }
141  avio_wl32(pb, bytespersec); /* bytes per second */
142  avio_wl16(pb, blkalign); /* block align */
143  avio_wl16(pb, bps); /* bits per sample */
144  if (par->codec_id == AV_CODEC_ID_MP3) {
145  bytestream_put_le16(&riff_extradata, 1); /* wID */
146  bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
147  bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
148  bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
149  bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
150  } else if (par->codec_id == AV_CODEC_ID_MP2) {
151  /* fwHeadLayer */
152  bytestream_put_le16(&riff_extradata, 2);
153  /* dwHeadBitrate */
154  bytestream_put_le32(&riff_extradata, par->bit_rate);
155  /* fwHeadMode */
156  bytestream_put_le16(&riff_extradata, par->ch_layout.nb_channels == 2 ? 1 : 8);
157  /* fwHeadModeExt */
158  bytestream_put_le16(&riff_extradata, 0);
159  /* wHeadEmphasis */
160  bytestream_put_le16(&riff_extradata, 1);
161  /* fwHeadFlags */
162  bytestream_put_le16(&riff_extradata, 16);
163  /* dwPTSLow */
164  bytestream_put_le32(&riff_extradata, 0);
165  /* dwPTSHigh */
166  bytestream_put_le32(&riff_extradata, 0);
167  } else if (par->codec_id == AV_CODEC_ID_G723_1) {
168  bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */
169  bytestream_put_le32(&riff_extradata, 0xaea2f732);
170  bytestream_put_le16(&riff_extradata, 0xacde);
171  } else if (par->codec_id == AV_CODEC_ID_GSM_MS ||
172  par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
173  /* wSamplesPerBlock */
174  bytestream_put_le16(&riff_extradata, frame_size);
175  } else if (par->extradata_size) {
176  riff_extradata_start = par->extradata;
177  riff_extradata = par->extradata + par->extradata_size;
178  }
179  /* write WAVEFORMATEXTENSIBLE extensions */
180  if (waveformatextensible) {
181  int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) &&
182  (s->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
183  par->ch_layout.u.mask < 0x40000);
184  /* 22 is WAVEFORMATEXTENSIBLE size */
185  avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
186  /* ValidBitsPerSample || SamplesPerBlock || Reserved */
187  avio_wl16(pb, bps);
188  /* dwChannelMask */
189  avio_wl32(pb, write_channel_mask ? par->ch_layout.u.mask : 0);
190  /* GUID + next 3 */
191  if (par->codec_id == AV_CODEC_ID_EAC3 || par->codec_id == AV_CODEC_ID_DFPWM) {
192  ff_put_guid(pb, ff_get_codec_guid(par->codec_id, ff_codec_wav_guids));
193  } else {
194  avio_wl32(pb, par->codec_tag);
195  avio_wl32(pb, 0x00100000);
196  avio_wl32(pb, 0xAA000080);
197  avio_wl32(pb, 0x719B3800);
198  }
199  } else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) ||
200  par->codec_tag != 0x0001 /* PCM */ ||
201  riff_extradata - riff_extradata_start) {
202  /* WAVEFORMATEX */
203  if (par->codec_tag == 0x1610) {
204  /* HEAACWAVEFORMAT */
205  avio_wl16(pb, par->extradata_size + 12); /* cbSize */
206  avio_wl16(pb, !par->extradata_size); // wPayloadType, 0 = Raw, 1 = ADTS
207  avio_wl16(pb, 0xFE); // wAudioProfileLevelIndication, 0xFE = unspecified
208  avio_wl16(pb, 0); // wStructType, 0 = AudioSpecificConfig()
209  avio_wl16(pb, 0); // wReserved1
210  avio_wl32(pb, 0); // dwReserved2
211  } else if (par->codec_tag == 0xFF && !par->extradata_size) {
212  av_log(s, AV_LOG_ERROR, "ADTS is only supported with codec tag 0x1610\n");
213  return AVERROR(EINVAL);
214  } else
215  avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
216  } /* else PCMWAVEFORMAT */
217  avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
218  hdrsize = avio_tell(pb) - hdrstart;
219  if (hdrsize & 1) {
220  hdrsize++;
221  avio_w8(pb, 0);
222  }
223 
224  return hdrsize;
225 }
226 
227 /* BITMAPINFOHEADER header */
228  void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
229  int for_asf, int ignore_extradata, int rgb_frame_is_flipped)
230 {
231  int flipped_extradata = (par->extradata_size >= 9 &&
232  !memcmp(par->extradata + par->extradata_size - 9, "BottomUp", 9));
233  int keep_height = flipped_extradata || rgb_frame_is_flipped;
234  int extradata_size = par->extradata_size - 9*flipped_extradata;
235  enum AVPixelFormat pix_fmt = par->format;
236  int pal_avi;
237 
238  if (pix_fmt == AV_PIX_FMT_NONE && par->bits_per_coded_sample == 1)
239  pix_fmt = AV_PIX_FMT_MONOWHITE;
240  pal_avi = !for_asf &&
241  (pix_fmt == AV_PIX_FMT_PAL8 ||
242  pix_fmt == AV_PIX_FMT_MONOWHITE ||
243  pix_fmt == AV_PIX_FMT_MONOBLACK);
244 
245  /* Size (not including the size of the color table or color masks) */
246  avio_wl32(pb, 40 + (ignore_extradata || pal_avi ? 0 : extradata_size));
247  avio_wl32(pb, par->width);
248  //We always store RGB TopDown
249  avio_wl32(pb, par->codec_tag || keep_height ? par->height : -par->height);
250  /* planes */
251  avio_wl16(pb, 1);
252  /* depth */
253  avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24);
254  /* compression type */
255  // MSRLE compatibility with Media Player 3.1 and Windows 95
256  avio_wl32(pb, par->codec_id == AV_CODEC_ID_MSRLE ? 1 : par->codec_tag);
257  avio_wl32(pb, (par->width * par->height * (par->bits_per_coded_sample ? par->bits_per_coded_sample : 24)+7) / 8);
258  avio_wl32(pb, 0);
259  avio_wl32(pb, 0);
260  /* Number of color indices in the color table that are used.
261  * A value of 0 means 2^biBitCount indices, but this doesn't work
262  * with Windows Media Player and files containing xxpc chunks. */
263  // MSRLE on Windows 95 requires a zero here
264  avio_wl32(pb, pal_avi && par->codec_id != AV_CODEC_ID_MSRLE ? 1 << par->bits_per_coded_sample : 0);
265  avio_wl32(pb, 0);
266 
267  if (!ignore_extradata) {
268  if (par->extradata_size) {
269  avio_write(pb, par->extradata, extradata_size);
270  if (!for_asf && extradata_size & 1)
271  avio_w8(pb, 0);
272  } else if (pal_avi) {
273  int i;
274  for (i = 0; i < 1 << par->bits_per_coded_sample; i++) {
275  /* Initialize 1 bpp palette to black & white */
276  if (i == 0 && pix_fmt == AV_PIX_FMT_MONOWHITE)
277  avio_wl32(pb, 0xffffff);
278  else if (i == 1 && pix_fmt == AV_PIX_FMT_MONOBLACK)
279  avio_wl32(pb, 0xffffff);
280  else
281  avio_wl32(pb, 0);
282  }
283  }
284  }
285 }
286 
287  void ff_parse_specific_params(AVStream *st, int *au_rate,
288  int *au_ssize, int *au_scale)
289 {
290  AVCodecParameters *par = st->codecpar;
291  int gcd;
292  int audio_frame_size;
293 
294  audio_frame_size = av_get_audio_frame_duration2(par, 0);
295  if (!audio_frame_size)
296  audio_frame_size = par->frame_size;
297 
298  *au_ssize = par->block_align;
299  if (audio_frame_size && par->sample_rate) {
300  *au_scale = audio_frame_size;
301  *au_rate = par->sample_rate;
302  } else if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
303  par->codec_type == AVMEDIA_TYPE_DATA ||
304  par->codec_type == AVMEDIA_TYPE_SUBTITLE) {
305  *au_scale = st->time_base.num;
306  *au_rate = st->time_base.den;
307  } else {
308  *au_scale = par->block_align ? par->block_align * 8 : 8;
309  *au_rate = par->bit_rate ? par->bit_rate :
310  8 * par->sample_rate;
311  }
312  gcd = av_gcd(*au_scale, *au_rate);
313  *au_scale /= gcd;
314  *au_rate /= gcd;
315 }
316 
317  void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
318 {
319  size_t len = strlen(str);
320  if (len > 0 && len < UINT32_MAX) {
321  len++;
322  ffio_wfourcc(pb, tag);
323  avio_wl32(pb, len);
324  avio_put_str(pb, str);
325  if (len & 1)
326  avio_w8(pb, 0);
327  }
328 }
329 
330  static const char riff_tags[][5] = {
331  "IARL", "IART", "IAS1", "IAS2", "IAS3", "IAS4", "IAS5", "IAS6", "IAS7",
332  "IAS8", "IAS9", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
333  "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
334  "IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
335  { 0 }
336 };
337 
338  static int riff_has_valid_tags(AVFormatContext *s)
339 {
340  int i;
341 
342  for (i = 0; *riff_tags[i]; i++)
343  if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
344  return 1;
345 
346  return 0;
347 }
348 
349  void ff_riff_write_info(AVFormatContext *s)
350 {
351  AVIOContext *pb = s->pb;
352  int i;
353  int64_t list_pos;
354  AVDictionaryEntry *t = NULL;
355 
356  ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
357 
358  /* writing empty LIST is not nice and may cause problems */
359  if (!riff_has_valid_tags(s))
360  return;
361 
362  list_pos = ff_start_tag(pb, "LIST");
363  ffio_wfourcc(pb, "INFO");
364  for (i = 0; *riff_tags[i]; i++)
365  if ((t = av_dict_get(s->metadata, riff_tags[i],
366  NULL, AV_DICT_MATCH_CASE)))
367  ff_riff_write_info_tag(s->pb, t->key, t->value);
368  ff_end_tag(pb, list_pos);
369 }
370 
371  void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
372 {
373  av_assert0(sizeof(*g) == 16);
374  avio_write(s, *g, sizeof(*g));
375 }
376 
377  const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
378 {
379  int i;
380  for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) {
381  if (id == av_guid[i].id)
382  return &(av_guid[i].guid);
383  }
384  return NULL;
385 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:337
flags
const SwsFlags flags[]
Definition: swscale.c:61
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:203
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:216
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
AV_CODEC_ID_AC3
@ AV_CODEC_ID_AC3
Definition: codec_id.h:462
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:51
ffio_wfourcc
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:124
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:395
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
int64_t
long long int64_t
Definition: coverity.c:34
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:287
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:82
AVChannelLayout::u
union AVChannelLayout::@488 u
Details about which channels are present in this layout.
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
mathematics.h
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:324
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:351
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:329
ff_put_guid
void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
Definition: riffenc.c:371
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:440
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:460
AVRational::num
int num
Numerator.
Definition: rational.h:59
AV_CODEC_ID_ATRAC3
@ AV_CODEC_ID_ATRAC3
Definition: codec_id.h:490
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:549
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:210
ff_get_codec_guid
const ff_asf_guid * ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
Definition: riffenc.c:377
AVCodecParameters::frame_size
int frame_size
Audio only.
Definition: codec_par.h:195
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:198
g
const char * g
Definition: vf_curves.c:128
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
AVDictionaryEntry::key
char * key
Definition: dict.h:91
frame_size
int frame_size
Definition: mxfenc.c:2487
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
AV_CODEC_ID_MP2
@ AV_CODEC_ID_MP2
Definition: codec_id.h:459
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:41
AVMEDIA_TYPE_DATA
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:202
ff_riff_write_info
void ff_riff_write_info(AVFormatContext *s)
Write all recognized RIFF tags from s->metadata.
Definition: riffenc.c:349
AVFormatContext
Format I/O context.
Definition: avformat.h:1264
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:767
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:783
NULL
#define NULL
Definition: coverity.c:32
ff_asf_guid
uint8_t ff_asf_guid[16]
Definition: riff.h:96
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:228
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:83
AV_CODEC_ID_G723_1
@ AV_CODEC_ID_G723_1
Definition: codec_id.h:511
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:184
AV_CODEC_ID_G728
@ AV_CODEC_ID_G728
Definition: codec_id.h:566
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
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:499
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:461
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
AV_CODEC_ID_PCM_S24LE
@ AV_CODEC_ID_PCM_S24LE
Definition: codec_id.h:349
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:319
AVCodecGuid::id
enum AVCodecID id
Definition: riff.h:99
bps
unsigned bps
Definition: movenc.c:1996
AV_CODEC_ID_ADPCM_SWF
@ AV_CODEC_ID_ADPCM_SWF
Definition: codec_id.h:389
AVCodecGuid
Definition: riff.h:98
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:816
ff_riff_info_conv
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:637
AV_CODEC_ID_MSRLE
@ AV_CODEC_ID_MSRLE
Definition: codec_id.h:97
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:317
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:206
FF_COMPLIANCE_NORMAL
#define FF_COMPLIANCE_NORMAL
Definition: defs.h:60
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:360
AV_CHANNEL_ORDER_NATIVE
@ AV_CHANNEL_ORDER_NATIVE
The native channel order, i.e.
Definition: channel_layout.h:125
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:809
avcodec_get_name
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:406
riff_tags
static const char riff_tags[][5]
Definition: riffenc.c:330
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:256
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:135
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:191
riff_has_valid_tags
static int riff_has_valid_tags(AVFormatContext *s)
Definition: riffenc.c:338
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:84
AV_CODEC_ID_GSM_MS
@ AV_CODEC_ID_GSM_MS
Definition: codec_id.h:489
tag
uint32_t tag
Definition: movenc.c:1995
AVStream
Stream structure.
Definition: avformat.h:744
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:236
pos
unsigned int pos
Definition: spdifenc.c:414
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:72
temp
else temp
Definition: vf_mcdeint.c:271
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:200
AV_CODEC_ID_PCM_S32LE
@ AV_CODEC_ID_PCM_S32LE
Definition: codec_id.h:345
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:342
AVCodecParameters::format
int format
Definition: codec_par.h:92
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:394
AV_CODEC_ID_PCM_F64LE
@ AV_CODEC_ID_PCM_F64LE
Definition: codec_id.h:360
AVDictionaryEntry
Definition: dict.h:90
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:55
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:377
riff.h
ff_codec_wav_guids
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:664
bytestream.h
AV_CODEC_ID_DFPWM
@ AV_CODEC_ID_DFPWM
Definition: codec_id.h:555
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:358
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVCodecGuid::guid
ff_asf_guid guid
Definition: riff.h:100
AVDictionaryEntry::value
char * value
Definition: dict.h:92
avio_put_str
int avio_put_str(AVIOContext *s, const char *str)
Write a NULL-terminated string.
Definition: aviobuf.c:376
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