FFmpeg
libvorbisenc.c
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1 /*
2  * Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <vorbis/vorbisenc.h>
22 
23 #include "libavutil/avassert.h"
25 #include "libavutil/fifo.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/opt.h"
28 #include "avcodec.h"
29 #include "audio_frame_queue.h"
30 #include "codec_internal.h"
31 #include "encode.h"
32 #include "version.h"
33 #include "vorbis_parser.h"
34 
35 
36 /* Number of samples the user should send in each call.
37  * This value is used because it is the LCD of all possible frame sizes, so
38  * an output packet will always start at the same point as one of the input
39  * packets.
40  */
41 #define LIBVORBIS_FRAME_SIZE 64
42 
43 #define BUFFER_SIZE (1024 * 64)
44 
45 typedef struct LibvorbisEncContext {
46  AVClass *av_class; /**< class for AVOptions */
47  vorbis_info vi; /**< vorbis_info used during init */
48  vorbis_dsp_state vd; /**< DSP state used for analysis */
49  vorbis_block vb; /**< vorbis_block used for analysis */
50  AVFifo *pkt_fifo; /**< output packet buffer */
51  int eof; /**< end-of-file flag */
52  int dsp_initialized; /**< vd has been initialized */
53  vorbis_comment vc; /**< VorbisComment info */
54  double iblock; /**< impulse block bias option */
55  AVVorbisParseContext *vp; /**< parse context to get durations */
56  AudioFrameQueue afq; /**< frame queue for timestamps */
58 
59 static const AVOption options[] = {
60  { "iblock", "Sets the impulse block bias", offsetof(LibvorbisEncContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
61  { NULL }
62 };
63 
64 static const FFCodecDefault defaults[] = {
65  { "b", "0" },
66  { NULL },
67 };
68 
69 static const AVClass vorbis_class = {
70  .class_name = "libvorbis",
71  .item_name = av_default_item_name,
72  .option = options,
73  .version = LIBAVUTIL_VERSION_INT,
74 };
75 
76 static const uint8_t vorbis_encoding_channel_layout_offsets[8][8] = {
77  { 0 },
78  { 0, 1 },
79  { 0, 2, 1 },
80  { 0, 1, 2, 3 },
81  { 0, 2, 1, 3, 4 },
82  { 0, 2, 1, 4, 5, 3 },
83  { 0, 2, 1, 5, 6, 4, 3 },
84  { 0, 2, 1, 6, 7, 4, 5, 3 },
85 };
86 
87 static int vorbis_error_to_averror(int ov_err)
88 {
89  switch (ov_err) {
90  case OV_EFAULT: return AVERROR_BUG;
91  case OV_EINVAL: return AVERROR(EINVAL);
92  case OV_EIMPL: return AVERROR(EINVAL);
93  default: return AVERROR_UNKNOWN;
94  }
95 }
96 
97 static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
98 {
100  int channels = avctx->ch_layout.nb_channels;
101  double cfreq;
102  int ret;
103 
104  if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) {
105  /* variable bitrate
106  * NOTE: we use the oggenc range of -1 to 10 for global_quality for
107  * user convenience, but libvorbis uses -0.1 to 1.0.
108  */
109  float q = avctx->global_quality / (float)FF_QP2LAMBDA;
110  /* default to 3 if the user did not set quality or bitrate */
111  if (!(avctx->flags & AV_CODEC_FLAG_QSCALE))
112  q = 3.0;
113  if ((ret = vorbis_encode_setup_vbr(vi, channels,
114  avctx->sample_rate,
115  q / 10.0)))
116  goto error;
117  } else {
118  int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
119  int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
120 
121  /* average bitrate */
122  if ((ret = vorbis_encode_setup_managed(vi, channels,
123  avctx->sample_rate, maxrate,
124  avctx->bit_rate, minrate)))
125  goto error;
126 
127  /* variable bitrate by estimate, disable slow rate management */
128  if (minrate == -1 && maxrate == -1)
129  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
130  goto error; /* should not happen */
131  }
132 
133  /* cutoff frequency */
134  if (avctx->cutoff > 0) {
135  cfreq = avctx->cutoff / 1000.0;
136  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
137  goto error; /* should not happen */
138  }
139 
140  /* impulse block bias */
141  if (s->iblock) {
142  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
143  goto error;
144  }
145 
146  if ((channels == 3 &&
148  (channels == 4 &&
151  (channels == 5 &&
154  (channels == 6 &&
157  (channels == 7 &&
159  (channels == 8 &&
161  if (avctx->ch_layout.order != AV_CHANNEL_ORDER_UNSPEC) {
162  char name[32];
163  av_channel_layout_describe(&avctx->ch_layout, name, sizeof(name));
164  av_log(avctx, AV_LOG_ERROR, "%s not supported by Vorbis: "
165  "output stream will have incorrect "
166  "channel layout.\n", name);
167  } else {
168  av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
169  "will use Vorbis channel layout for "
170  "%d channels.\n", channels);
171  }
172  }
173 
174  if ((ret = vorbis_encode_setup_init(vi)))
175  goto error;
176 
177  return 0;
178 error:
180 }
181 
182 /* How many bytes are needed for a buffer of length 'l' */
183 static int xiph_len(int l)
184 {
185  return 1 + l / 255 + l;
186 }
187 
189 {
190  LibvorbisEncContext *s = avctx->priv_data;
191 
192  /* notify vorbisenc this is EOF */
193  if (s->dsp_initialized)
194  vorbis_analysis_wrote(&s->vd, 0);
195 
196  vorbis_block_clear(&s->vb);
197  vorbis_dsp_clear(&s->vd);
198  vorbis_info_clear(&s->vi);
199 
200  av_fifo_freep2(&s->pkt_fifo);
201  ff_af_queue_close(&s->afq);
202 
203  av_vorbis_parse_free(&s->vp);
204 
205  return 0;
206 }
207 
209 {
210  LibvorbisEncContext *s = avctx->priv_data;
211  ogg_packet header, header_comm, header_code;
212  uint8_t *p;
213  unsigned int offset;
214  int ret;
215 
216  vorbis_info_init(&s->vi);
217  if ((ret = libvorbis_setup(&s->vi, avctx))) {
218  av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
219  goto error;
220  }
221  if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
222  av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
224  goto error;
225  }
226  s->dsp_initialized = 1;
227  if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
228  av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
230  goto error;
231  }
232 
233  vorbis_comment_init(&s->vc);
234  if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT))
235  vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
236 
237  if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
238  &header_code))) {
240  goto error;
241  }
242 
243  avctx->extradata_size = 1 + xiph_len(header.bytes) +
244  xiph_len(header_comm.bytes) +
245  header_code.bytes;
246  p = avctx->extradata = av_malloc(avctx->extradata_size +
248  if (!p) {
249  ret = AVERROR(ENOMEM);
250  goto error;
251  }
252  p[0] = 2;
253  offset = 1;
254  offset += av_xiphlacing(&p[offset], header.bytes);
255  offset += av_xiphlacing(&p[offset], header_comm.bytes);
256  memcpy(&p[offset], header.packet, header.bytes);
257  offset += header.bytes;
258  memcpy(&p[offset], header_comm.packet, header_comm.bytes);
259  offset += header_comm.bytes;
260  memcpy(&p[offset], header_code.packet, header_code.bytes);
261  offset += header_code.bytes;
262  av_assert0(offset == avctx->extradata_size);
263 
264  s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
265  if (!s->vp) {
266  av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
267  return ret;
268  }
269 
270  vorbis_comment_clear(&s->vc);
271 
273  ff_af_queue_init(avctx, &s->afq);
274 
275  s->pkt_fifo = av_fifo_alloc2(BUFFER_SIZE, 1, 0);
276  if (!s->pkt_fifo) {
277  ret = AVERROR(ENOMEM);
278  goto error;
279  }
280 
281  return 0;
282 error:
283  libvorbis_encode_close(avctx);
284  return ret;
285 }
286 
288  const AVFrame *frame, int *got_packet_ptr)
289 {
290  LibvorbisEncContext *s = avctx->priv_data;
291  ogg_packet op;
292  int ret, duration;
293 
294  /* send samples to libvorbis */
295  if (frame) {
296  const int samples = frame->nb_samples;
297  float **buffer;
298  int c, channels = s->vi.channels;
299 
300  buffer = vorbis_analysis_buffer(&s->vd, samples);
301  for (c = 0; c < channels; c++) {
302  int co = (channels > 8) ? c :
304  memcpy(buffer[c], frame->extended_data[co],
305  samples * sizeof(*buffer[c]));
306  }
307  if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
308  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
310  }
311  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
312  return ret;
313  } else {
314  if (!s->eof && s->afq.frame_alloc)
315  if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
316  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
318  }
319  s->eof = 1;
320  }
321 
322  /* retrieve available packets from libvorbis */
323  while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
324  if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
325  break;
326  if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
327  break;
328 
329  /* add any available packets to the output packet buffer */
330  while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
331  if (av_fifo_can_write(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
332  av_log(avctx, AV_LOG_ERROR, "packet buffer is too small\n");
333  return AVERROR_BUG;
334  }
335  av_fifo_write(s->pkt_fifo, &op, sizeof(ogg_packet));
336  av_fifo_write(s->pkt_fifo, op.packet, op.bytes);
337  }
338  if (ret < 0) {
339  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
340  break;
341  }
342  }
343  if (ret < 0) {
344  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
346  }
347 
348  /* Read an available packet if possible */
349  if (av_fifo_read(s->pkt_fifo, &op, sizeof(ogg_packet)) < 0)
350  return 0;
351 
352  if ((ret = ff_get_encode_buffer(avctx, avpkt, op.bytes, 0)) < 0)
353  return ret;
354  av_fifo_read(s->pkt_fifo, avpkt->data, op.bytes);
355 
356  avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);
357 
358  duration = av_vorbis_parse_frame(s->vp, avpkt->data, avpkt->size);
359  if (duration > 0) {
360  /* we do not know encoder delay until we get the first packet from
361  * libvorbis, so we have to update the AudioFrameQueue counts */
362  if (!avctx->initial_padding && s->afq.frames) {
363  avctx->initial_padding = duration;
364  av_assert0(!s->afq.remaining_delay);
365  s->afq.frames->duration += duration;
366  if (s->afq.frames->pts != AV_NOPTS_VALUE)
367  s->afq.frames->pts -= duration;
368  s->afq.remaining_samples += duration;
369  }
370  ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);
371  }
372 
373  *got_packet_ptr = 1;
374  return 0;
375 }
376 
378  .p.name = "libvorbis",
379  CODEC_LONG_NAME("libvorbis"),
380  .p.type = AVMEDIA_TYPE_AUDIO,
381  .p.id = AV_CODEC_ID_VORBIS,
382  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
384  .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
385  .priv_data_size = sizeof(LibvorbisEncContext),
388  .close = libvorbis_encode_close,
389  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
391  .p.priv_class = &vorbis_class,
392  .defaults = defaults,
393  .p.wrapper_name = "libvorbis",
394 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:32
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1077
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
LibvorbisEncContext::vc
vorbis_comment vc
VorbisComment info
Definition: libvorbisenc.c:53
av_fifo_can_write
size_t av_fifo_can_write(const AVFifo *f)
Definition: fifo.c:94
av_vorbis_parse_free
void av_vorbis_parse_free(AVVorbisParseContext **s)
Free the parser and everything associated with it.
Definition: vorbis_parser.c:279
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
opt.h
LIBAVCODEC_IDENT
#define LIBAVCODEC_IDENT
Definition: version.h:43
ff_af_queue_remove
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int64_t *duration)
Remove frame(s) from the queue.
Definition: audio_frame_queue.c:75
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1050
AVVorbisParseContext
Definition: vorbis_parser_internal.h:34
AVCodecContext::rc_min_rate
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:1299
ff_af_queue_close
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
Definition: audio_frame_queue.c:36
AV_CODEC_FLAG_QSCALE
#define AV_CODEC_FLAG_QSCALE
Use fixed qscale.
Definition: avcodec.h:224
ff_af_queue_init
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
Definition: audio_frame_queue.c:28
AV_CHANNEL_LAYOUT_2_2
#define AV_CHANNEL_LAYOUT_2_2
Definition: channel_layout.h:386
vorbis_class
static const AVClass vorbis_class
Definition: libvorbisenc.c:69
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:375
AVPacket::data
uint8_t * data
Definition: packet.h:524
AVOption
AVOption.
Definition: opt.h:346
encode.h
libvorbis_setup
static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
Definition: libvorbisenc.c:97
LIBVORBIS_FRAME_SIZE
#define LIBVORBIS_FRAME_SIZE
Definition: libvorbisenc.c:41
FF_CODEC_CAP_NOT_INIT_THREADSAFE
#define FF_CODEC_CAP_NOT_INIT_THREADSAFE
The codec is not known to be init-threadsafe (i.e.
Definition: codec_internal.h:34
FFCodec
Definition: codec_internal.h:127
version.h
av_vorbis_parse_frame
int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf, int buf_size)
Get the duration for a Vorbis packet.
Definition: vorbis_parser.c:267
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:542
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:308
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:73
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
fifo.h
FFCodecDefault
Definition: codec_internal.h:97
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1065
av_fifo_write
int av_fifo_write(AVFifo *f, const void *buf, size_t nb_elems)
Write data into a FIFO.
Definition: fifo.c:188
defaults
static const FFCodecDefault defaults[]
Definition: libvorbisenc.c:64
audio_frame_queue.h
AVCodecContext::initial_padding
int initial_padding
Audio only.
Definition: avcodec.h:1122
options
static const AVOption options[]
Definition: libvorbisenc.c:59
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:502
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:296
ff_af_queue_add
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
Definition: audio_frame_queue.c:44
ogg_packet
static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, int64_t *fpos)
find the next Ogg packet
Definition: oggdec.c:498
AV_CHANNEL_LAYOUT_SURROUND
#define AV_CHANNEL_LAYOUT_SURROUND
Definition: channel_layout.h:382
LibvorbisEncContext::av_class
AVClass * av_class
class for AVOptions
Definition: libvorbisenc.c:46
LibvorbisEncContext::vi
vorbis_info vi
vorbis_info used during init
Definition: libvorbisenc.c:47
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:274
libvorbis_encode_frame
static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libvorbisenc.c:287
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
av_fifo_read
int av_fifo_read(AVFifo *f, void *buf, size_t nb_elems)
Read data from a FIFO.
Definition: fifo.c:240
duration
int64_t duration
Definition: movenc.c:65
av_channel_layout_describe
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
Definition: channel_layout.c:645
float
float
Definition: af_crystalizer.c:121
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
AV_CHANNEL_LAYOUT_7POINT1
#define AV_CHANNEL_LAYOUT_7POINT1
Definition: channel_layout.h:401
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVCodecContext::global_quality
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1239
libvorbis_encode_close
static av_cold int libvorbis_encode_close(AVCodecContext *avctx)
Definition: libvorbisenc.c:188
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:237
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
op
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:76
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
AV_CHANNEL_LAYOUT_5POINT0_BACK
#define AV_CHANNEL_LAYOUT_5POINT0_BACK
Definition: channel_layout.h:390
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AudioFrameQueue
Definition: audio_frame_queue.h:32
channels
channels
Definition: aptx.h:31
AVCodecContext::rc_max_rate
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1292
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
ff_samples_to_time_base
static av_always_inline int64_t ff_samples_to_time_base(const AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: encode.h:90
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:495
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
vorbis_parser.h
LibvorbisEncContext::afq
AudioFrameQueue afq
frame queue for timestamps
Definition: libvorbisenc.c:56
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
A generic parameter which can be set by the user for muxing or encoding.
Definition: opt.h:269
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:525
AVFifo
Definition: fifo.c:35
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
codec_internal.h
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
av_xiphlacing
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:817
LibvorbisEncContext::vb
vorbis_block vb
vorbis_block used for analysis
Definition: libvorbisenc.c:49
LibvorbisEncContext::vp
AVVorbisParseContext * vp
parse context to get durations
Definition: libvorbisenc.c:55
header
static const uint8_t header[24]
Definition: sdr2.c:68
BUFFER_SIZE
#define BUFFER_SIZE
Definition: libvorbisenc.c:43
LibvorbisEncContext
Definition: libvorbisenc.c:45
xiph_len
static int xiph_len(int l)
Definition: libvorbisenc.c:183
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
vorbis_error_to_averror
static int vorbis_error_to_averror(int ov_err)
Definition: libvorbisenc.c:87
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:801
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:517
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
LibvorbisEncContext::pkt_fifo
AVFifo * pkt_fifo
output packet buffer
Definition: libvorbisenc.c:50
AV_CHANNEL_LAYOUT_QUAD
#define AV_CHANNEL_LAYOUT_QUAD
Definition: channel_layout.h:387
AVCodecContext::cutoff
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1090
vorbis_encoding_channel_layout_offsets
static const uint8_t vorbis_encoding_channel_layout_offsets[8][8]
Definition: libvorbisenc.c:76
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
av_vorbis_parse_init
AVVorbisParseContext * av_vorbis_parse_init(const uint8_t *extradata, int extradata_size)
Allocate and initialize the Vorbis parser using headers in the extradata.
Definition: vorbis_parser.c:284
LibvorbisEncContext::eof
int eof
end-of-file flag
Definition: libvorbisenc.c:51
libvorbis_encode_init
static av_cold int libvorbis_encode_init(AVCodecContext *avctx)
Definition: libvorbisenc.c:208
av_fifo_alloc2
AVFifo * av_fifo_alloc2(size_t nb_elems, size_t elem_size, unsigned int flags)
Allocate and initialize an AVFifo with a given element size.
Definition: fifo.c:47
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
AVCodecContext
main external API structure.
Definition: avcodec.h:445
channel_layout.h
LibvorbisEncContext::iblock
double iblock
impulse block bias option
Definition: libvorbisenc.c:54
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
ff_get_encode_buffer
int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags)
Get a buffer for a packet.
Definition: encode.c:106
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:76
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
LibvorbisEncContext::dsp_initialized
int dsp_initialized
vd has been initialized
Definition: libvorbisenc.c:52
mem.h
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:342
ff_libvorbis_encoder
const FFCodec ff_libvorbis_encoder
Definition: libvorbisenc.c:377
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AV_CHANNEL_LAYOUT_5POINT1_BACK
#define AV_CHANNEL_LAYOUT_5POINT1_BACK
Definition: channel_layout.h:391
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AV_CHANNEL_LAYOUT_6POINT1
#define AV_CHANNEL_LAYOUT_6POINT1
Definition: channel_layout.h:396
av_fifo_freep2
void av_fifo_freep2(AVFifo **f)
Free an AVFifo and reset pointer to NULL.
Definition: fifo.c:286
AV_CHANNEL_LAYOUT_5POINT0
#define AV_CHANNEL_LAYOUT_5POINT0
Definition: channel_layout.h:388
AV_CODEC_ID_VORBIS
@ AV_CODEC_ID_VORBIS
Definition: codec_id.h:445
FF_QP2LAMBDA
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:227
AV_CODEC_CAP_SMALL_LAST_FRAME
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: codec.h:81
AV_CHANNEL_LAYOUT_5POINT1
#define AV_CHANNEL_LAYOUT_5POINT1
Definition: channel_layout.h:389
LibvorbisEncContext::vd
vorbis_dsp_state vd
DSP state used for analysis
Definition: libvorbisenc.c:48