FFmpeg  4.4.6
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"
24 #include "libavutil/fifo.h"
25 #include "libavutil/opt.h"
26 #include "avcodec.h"
27 #include "audio_frame_queue.h"
28 #include "internal.h"
29 #include "vorbis.h"
30 #include "vorbis_parser.h"
31 
32 
33 /* Number of samples the user should send in each call.
34  * This value is used because it is the LCD of all possible frame sizes, so
35  * an output packet will always start at the same point as one of the input
36  * packets.
37  */
38 #define LIBVORBIS_FRAME_SIZE 64
39 
40 #define BUFFER_SIZE (1024 * 64)
41 
42 typedef struct LibvorbisEncContext {
43  AVClass *av_class; /**< class for AVOptions */
44  vorbis_info vi; /**< vorbis_info used during init */
45  vorbis_dsp_state vd; /**< DSP state used for analysis */
46  vorbis_block vb; /**< vorbis_block used for analysis */
47  AVFifoBuffer *pkt_fifo; /**< output packet buffer */
48  int eof; /**< end-of-file flag */
49  int dsp_initialized; /**< vd has been initialized */
50  vorbis_comment vc; /**< VorbisComment info */
51  double iblock; /**< impulse block bias option */
52  AVVorbisParseContext *vp; /**< parse context to get durations */
53  AudioFrameQueue afq; /**< frame queue for timestamps */
55 
56 static const AVOption options[] = {
57  { "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 },
58  { NULL }
59 };
60 
61 static const AVCodecDefault defaults[] = {
62  { "b", "0" },
63  { NULL },
64 };
65 
66 static const AVClass vorbis_class = {
67  .class_name = "libvorbis",
68  .item_name = av_default_item_name,
69  .option = options,
70  .version = LIBAVUTIL_VERSION_INT,
71 };
72 
74  { 0 },
75  { 0, 1 },
76  { 0, 2, 1 },
77  { 0, 1, 2, 3 },
78  { 0, 2, 1, 3, 4 },
79  { 0, 2, 1, 4, 5, 3 },
80  { 0, 2, 1, 5, 6, 4, 3 },
81  { 0, 2, 1, 6, 7, 4, 5, 3 },
82 };
83 
84 static int vorbis_error_to_averror(int ov_err)
85 {
86  switch (ov_err) {
87  case OV_EFAULT: return AVERROR_BUG;
88  case OV_EINVAL: return AVERROR(EINVAL);
89  case OV_EIMPL: return AVERROR(EINVAL);
90  default: return AVERROR_UNKNOWN;
91  }
92 }
93 
94 static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
95 {
97  double cfreq;
98  int ret;
99 
100  if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) {
101  /* variable bitrate
102  * NOTE: we use the oggenc range of -1 to 10 for global_quality for
103  * user convenience, but libvorbis uses -0.1 to 1.0.
104  */
105  float q = avctx->global_quality / (float)FF_QP2LAMBDA;
106  /* default to 3 if the user did not set quality or bitrate */
107  if (!(avctx->flags & AV_CODEC_FLAG_QSCALE))
108  q = 3.0;
109  if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
110  avctx->sample_rate,
111  q / 10.0)))
112  goto error;
113  } else {
114  int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
115  int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
116 
117  /* average bitrate */
118  if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,
119  avctx->sample_rate, maxrate,
120  avctx->bit_rate, minrate)))
121  goto error;
122 
123  /* variable bitrate by estimate, disable slow rate management */
124  if (minrate == -1 && maxrate == -1)
125  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
126  goto error; /* should not happen */
127  }
128 
129  /* cutoff frequency */
130  if (avctx->cutoff > 0) {
131  cfreq = avctx->cutoff / 1000.0;
132  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
133  goto error; /* should not happen */
134  }
135 
136  /* impulse block bias */
137  if (s->iblock) {
138  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
139  goto error;
140  }
141 
142  if (avctx->channels == 3 &&
144  avctx->channels == 4 &&
145  avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
146  avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
147  avctx->channels == 5 &&
150  avctx->channels == 6 &&
153  avctx->channels == 7 &&
155  avctx->channels == 8 &&
157  if (avctx->channel_layout) {
158  char name[32];
160  avctx->channel_layout);
161  av_log(avctx, AV_LOG_ERROR, "%s not supported by Vorbis: "
162  "output stream will have incorrect "
163  "channel layout.\n", name);
164  } else {
165  av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
166  "will use Vorbis channel layout for "
167  "%d channels.\n", avctx->channels);
168  }
169  }
170 
171  if ((ret = vorbis_encode_setup_init(vi)))
172  goto error;
173 
174  return 0;
175 error:
176  return vorbis_error_to_averror(ret);
177 }
178 
179 /* How many bytes are needed for a buffer of length 'l' */
180 static int xiph_len(int l)
181 {
182  return 1 + l / 255 + l;
183 }
184 
186 {
187  LibvorbisEncContext *s = avctx->priv_data;
188 
189  /* notify vorbisenc this is EOF */
190  if (s->dsp_initialized)
191  vorbis_analysis_wrote(&s->vd, 0);
192 
193  vorbis_block_clear(&s->vb);
194  vorbis_dsp_clear(&s->vd);
195  vorbis_info_clear(&s->vi);
196 
197  av_fifo_freep(&s->pkt_fifo);
198  ff_af_queue_close(&s->afq);
199  av_freep(&avctx->extradata);
200 
201  av_vorbis_parse_free(&s->vp);
202 
203  return 0;
204 }
205 
207 {
208  LibvorbisEncContext *s = avctx->priv_data;
209  ogg_packet header, header_comm, header_code;
210  uint8_t *p;
211  unsigned int offset;
212  int ret;
213 
214  vorbis_info_init(&s->vi);
215  if ((ret = libvorbis_setup(&s->vi, avctx))) {
216  av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
217  goto error;
218  }
219  if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
220  av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
221  ret = vorbis_error_to_averror(ret);
222  goto error;
223  }
224  s->dsp_initialized = 1;
225  if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
226  av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
227  ret = vorbis_error_to_averror(ret);
228  goto error;
229  }
230 
231  vorbis_comment_init(&s->vc);
232  if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT))
233  vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
234 
235  if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
236  &header_code))) {
237  ret = vorbis_error_to_averror(ret);
238  goto error;
239  }
240 
241  avctx->extradata_size = 1 + xiph_len(header.bytes) +
242  xiph_len(header_comm.bytes) +
243  header_code.bytes;
244  p = avctx->extradata = av_malloc(avctx->extradata_size +
246  if (!p) {
247  ret = AVERROR(ENOMEM);
248  goto error;
249  }
250  p[0] = 2;
251  offset = 1;
252  offset += av_xiphlacing(&p[offset], header.bytes);
253  offset += av_xiphlacing(&p[offset], header_comm.bytes);
254  memcpy(&p[offset], header.packet, header.bytes);
255  offset += header.bytes;
256  memcpy(&p[offset], header_comm.packet, header_comm.bytes);
257  offset += header_comm.bytes;
258  memcpy(&p[offset], header_code.packet, header_code.bytes);
259  offset += header_code.bytes;
260  av_assert0(offset == avctx->extradata_size);
261 
262  s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
263  if (!s->vp) {
264  av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
265  return ret;
266  }
267 
268  vorbis_comment_clear(&s->vc);
269 
271  ff_af_queue_init(avctx, &s->afq);
272 
273  s->pkt_fifo = av_fifo_alloc(BUFFER_SIZE);
274  if (!s->pkt_fifo) {
275  ret = AVERROR(ENOMEM);
276  goto error;
277  }
278 
279  return 0;
280 error:
281  libvorbis_encode_close(avctx);
282  return ret;
283 }
284 
286  const AVFrame *frame, int *got_packet_ptr)
287 {
288  LibvorbisEncContext *s = avctx->priv_data;
289  ogg_packet op;
290  int ret, duration;
291 
292  /* send samples to libvorbis */
293  if (frame) {
294  const int samples = frame->nb_samples;
295  float **buffer;
296  int c, channels = s->vi.channels;
297 
298  buffer = vorbis_analysis_buffer(&s->vd, samples);
299  for (c = 0; c < channels; c++) {
300  int co = (channels > 8) ? c :
302  memcpy(buffer[c], frame->extended_data[co],
303  samples * sizeof(*buffer[c]));
304  }
305  if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
306  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
307  return vorbis_error_to_averror(ret);
308  }
309  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
310  return ret;
311  } else {
312  if (!s->eof && s->afq.frame_alloc)
313  if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
314  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
315  return vorbis_error_to_averror(ret);
316  }
317  s->eof = 1;
318  }
319 
320  /* retrieve available packets from libvorbis */
321  while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
322  if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
323  break;
324  if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
325  break;
326 
327  /* add any available packets to the output packet buffer */
328  while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
329  if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
330  av_log(avctx, AV_LOG_ERROR, "packet buffer is too small\n");
331  return AVERROR_BUG;
332  }
333  av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
334  av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);
335  }
336  if (ret < 0) {
337  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
338  break;
339  }
340  }
341  if (ret < 0) {
342  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
343  return vorbis_error_to_averror(ret);
344  }
345 
346  /* check for available packets */
347  if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))
348  return 0;
349 
350  av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
351 
352  if ((ret = ff_alloc_packet2(avctx, avpkt, op.bytes, 0)) < 0)
353  return ret;
354  av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);
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  .name = "libvorbis",
379  .long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
380  .type = AVMEDIA_TYPE_AUDIO,
381  .id = AV_CODEC_ID_VORBIS,
382  .priv_data_size = sizeof(LibvorbisEncContext),
384  .encode2 = libvorbis_encode_frame,
385  .close = libvorbis_encode_close,
387  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
389  .priv_class = &vorbis_class,
390  .defaults = defaults,
391  .wrapper_name = "libvorbis",
392 };
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:925
channels
Definition: aptx.h:33
#define av_cold
Definition: attributes.h:88
uint8_t
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int64_t *duration)
Remove frame(s) from the queue.
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
static AVFrame * frame
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:33
a very simple circular buffer FIFO implementation
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
#define AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_5POINT0
#define AV_CH_LAYOUT_7POINT1
#define AV_CH_LAYOUT_2_2
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
#define AV_CH_LAYOUT_5POINT0_BACK
#define AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_5POINT1
#define AV_CH_LAYOUT_5POINT1_BACK
#define AV_CH_BACK_CENTER
#define AV_CH_FRONT_CENTER
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:333
#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:77
#define AV_CODEC_FLAG_QSCALE
Use fixed qscale.
Definition: avcodec.h:275
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: codec.h:82
@ AV_CODEC_ID_VORBIS
Definition: codec_id.h:429
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:892
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:227
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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:75
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:277
#define LIBAVCODEC_IDENT
Definition: version.h:42
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
Feed data from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:213
int av_fifo_space(const AVFifoBuffer *f)
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...
Definition: fifo.c:82
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int libvorbis_encode_close(AVCodecContext *avctx)
Definition: libvorbisenc.c:185
static const AVCodecDefault defaults[]
Definition: libvorbisenc.c:61
static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libvorbisenc.c:285
static const AVOption options[]
Definition: libvorbisenc.c:56
static int vorbis_error_to_averror(int ov_err)
Definition: libvorbisenc.c:84
static const AVClass vorbis_class
Definition: libvorbisenc.c:66
static av_cold int libvorbis_encode_init(AVCodecContext *avctx)
Definition: libvorbisenc.c:206
AVCodec ff_libvorbis_encoder
Definition: libvorbisenc.c:377
#define BUFFER_SIZE
Definition: libvorbisenc.c:40
static const uint8_t vorbis_encoding_channel_layout_offsets[8][8]
Definition: libvorbisenc.c:73
#define LIBVORBIS_FRAME_SIZE
Definition: libvorbisenc.c:38
static int xiph_len(int l)
Definition: libvorbisenc.c:180
static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
Definition: libvorbisenc.c:94
static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, int64_t *fpos)
find the next Ogg packet
Definition: oggdec.c:498
AVOptions.
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:280
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
const char * name
Definition: qsvenc.c:46
static const uint8_t header[24]
Definition: sdr2.c:67
static char buffer[20]
Definition: seek.c:32
Describe the class of an AVClass context structure.
Definition: log.h:67
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:72
main external API structure.
Definition: avcodec.h:536
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:602
int64_t bit_rate
the average bitrate
Definition: avcodec.h:586
int initial_padding
Audio only.
Definition: avcodec.h:2066
int sample_rate
samples per second
Definition: avcodec.h:1196
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1420
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:616
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
int channels
number of audio channels
Definition: avcodec.h:1197
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:1427
int extradata_size
Definition: avcodec.h:638
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1240
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1247
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1216
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:384
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:365
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
vorbis_dsp_state vd
DSP state used for analysis
Definition: libvorbisenc.c:45
int dsp_initialized
vd has been initialized
Definition: libvorbisenc.c:49
AudioFrameQueue afq
frame queue for timestamps
Definition: libvorbisenc.c:53
vorbis_comment vc
VorbisComment info
Definition: libvorbisenc.c:50
double iblock
impulse block bias option
Definition: libvorbisenc.c:51
AVClass * av_class
class for AVOptions
Definition: libvorbisenc.c:43
AVFifoBuffer * pkt_fifo
output packet buffer
Definition: libvorbisenc.c:47
vorbis_info vi
vorbis_info used during init
Definition: libvorbisenc.c:44
AVVorbisParseContext * vp
parse context to get durations
Definition: libvorbisenc.c:52
int eof
end-of-file flag
Definition: libvorbisenc.c:48
vorbis_block vb
vorbis_block used for analysis
Definition: libvorbisenc.c:46
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
static void error(const char *err)
int64_t duration
Definition: movenc.c:64
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
void av_vorbis_parse_free(AVVorbisParseContext **s)
Free the parser and everything associated with it.
int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf, int buf_size)
Get the duration for a Vorbis packet.
AVVorbisParseContext * av_vorbis_parse_init(const uint8_t *extradata, int extradata_size)
Allocate and initialize the Vorbis parser using headers in the extradata.
A public API for Vorbis parsing.
static double c[64]