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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 
73 static int vorbis_error_to_averror(int ov_err)
74 {
75  switch (ov_err) {
76  case OV_EFAULT: return AVERROR_BUG;
77  case OV_EINVAL: return AVERROR(EINVAL);
78  case OV_EIMPL: return AVERROR(EINVAL);
79  default: return AVERROR_UNKNOWN;
80  }
81 }
82 
83 static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
84 {
86  double cfreq;
87  int ret;
88 
89  if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) {
90  /* variable bitrate
91  * NOTE: we use the oggenc range of -1 to 10 for global_quality for
92  * user convenience, but libvorbis uses -0.1 to 1.0.
93  */
94  float q = avctx->global_quality / (float)FF_QP2LAMBDA;
95  /* default to 3 if the user did not set quality or bitrate */
96  if (!(avctx->flags & AV_CODEC_FLAG_QSCALE))
97  q = 3.0;
98  if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
99  avctx->sample_rate,
100  q / 10.0)))
101  goto error;
102  } else {
103  int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
104  int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
105 
106  /* average bitrate */
107  if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,
108  avctx->sample_rate, maxrate,
109  avctx->bit_rate, minrate)))
110  goto error;
111 
112  /* variable bitrate by estimate, disable slow rate management */
113  if (minrate == -1 && maxrate == -1)
114  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
115  goto error; /* should not happen */
116  }
117 
118  /* cutoff frequency */
119  if (avctx->cutoff > 0) {
120  cfreq = avctx->cutoff / 1000.0;
121  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
122  goto error; /* should not happen */
123  }
124 
125  /* impulse block bias */
126  if (s->iblock) {
127  if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
128  goto error;
129  }
130 
131  if (avctx->channels == 3 &&
133  avctx->channels == 4 &&
134  avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
135  avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
136  avctx->channels == 5 &&
139  avctx->channels == 6 &&
142  avctx->channels == 7 &&
144  avctx->channels == 8 &&
146  if (avctx->channel_layout) {
147  char name[32];
148  av_get_channel_layout_string(name, sizeof(name), avctx->channels,
149  avctx->channel_layout);
150  av_log(avctx, AV_LOG_ERROR, "%s not supported by Vorbis: "
151  "output stream will have incorrect "
152  "channel layout.\n", name);
153  } else {
154  av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
155  "will use Vorbis channel layout for "
156  "%d channels.\n", avctx->channels);
157  }
158  }
159 
160  if ((ret = vorbis_encode_setup_init(vi)))
161  goto error;
162 
163  return 0;
164 error:
165  return vorbis_error_to_averror(ret);
166 }
167 
168 /* How many bytes are needed for a buffer of length 'l' */
169 static int xiph_len(int l)
170 {
171  return 1 + l / 255 + l;
172 }
173 
175 {
176  LibvorbisEncContext *s = avctx->priv_data;
177 
178  /* notify vorbisenc this is EOF */
179  if (s->dsp_initialized)
180  vorbis_analysis_wrote(&s->vd, 0);
181 
182  vorbis_block_clear(&s->vb);
183  vorbis_dsp_clear(&s->vd);
184  vorbis_info_clear(&s->vi);
185 
186  av_fifo_freep(&s->pkt_fifo);
187  ff_af_queue_close(&s->afq);
188  av_freep(&avctx->extradata);
189 
191 
192  return 0;
193 }
194 
196 {
197  LibvorbisEncContext *s = avctx->priv_data;
198  ogg_packet header, header_comm, header_code;
199  uint8_t *p;
200  unsigned int offset;
201  int ret;
202 
203  vorbis_info_init(&s->vi);
204  if ((ret = libvorbis_setup(&s->vi, avctx))) {
205  av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
206  goto error;
207  }
208  if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
209  av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
210  ret = vorbis_error_to_averror(ret);
211  goto error;
212  }
213  s->dsp_initialized = 1;
214  if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
215  av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
216  ret = vorbis_error_to_averror(ret);
217  goto error;
218  }
219 
220  vorbis_comment_init(&s->vc);
221  if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT))
222  vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
223 
224  if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
225  &header_code))) {
226  ret = vorbis_error_to_averror(ret);
227  goto error;
228  }
229 
230  avctx->extradata_size = 1 + xiph_len(header.bytes) +
231  xiph_len(header_comm.bytes) +
232  header_code.bytes;
233  p = avctx->extradata = av_malloc(avctx->extradata_size +
235  if (!p) {
236  ret = AVERROR(ENOMEM);
237  goto error;
238  }
239  p[0] = 2;
240  offset = 1;
241  offset += av_xiphlacing(&p[offset], header.bytes);
242  offset += av_xiphlacing(&p[offset], header_comm.bytes);
243  memcpy(&p[offset], header.packet, header.bytes);
244  offset += header.bytes;
245  memcpy(&p[offset], header_comm.packet, header_comm.bytes);
246  offset += header_comm.bytes;
247  memcpy(&p[offset], header_code.packet, header_code.bytes);
248  offset += header_code.bytes;
249  av_assert0(offset == avctx->extradata_size);
250 
251  s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
252  if (!s->vp) {
253  av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
254  return ret;
255  }
256 
257  vorbis_comment_clear(&s->vc);
258 
260  ff_af_queue_init(avctx, &s->afq);
261 
263  if (!s->pkt_fifo) {
264  ret = AVERROR(ENOMEM);
265  goto error;
266  }
267 
268  return 0;
269 error:
270  libvorbis_encode_close(avctx);
271  return ret;
272 }
273 
275  const AVFrame *frame, int *got_packet_ptr)
276 {
277  LibvorbisEncContext *s = avctx->priv_data;
278  ogg_packet op;
279  int ret, duration;
280 
281  /* send samples to libvorbis */
282  if (frame) {
283  const int samples = frame->nb_samples;
284  float **buffer;
285  int c, channels = s->vi.channels;
286 
287  buffer = vorbis_analysis_buffer(&s->vd, samples);
288  for (c = 0; c < channels; c++) {
289  int co = (channels > 8) ? c :
291  memcpy(buffer[c], frame->extended_data[co],
292  samples * sizeof(*buffer[c]));
293  }
294  if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
295  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
296  return vorbis_error_to_averror(ret);
297  }
298  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
299  return ret;
300  } else {
301  if (!s->eof && s->afq.frame_alloc)
302  if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
303  av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
304  return vorbis_error_to_averror(ret);
305  }
306  s->eof = 1;
307  }
308 
309  /* retrieve available packets from libvorbis */
310  while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
311  if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
312  break;
313  if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
314  break;
315 
316  /* add any available packets to the output packet buffer */
317  while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
318  if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
319  av_log(avctx, AV_LOG_ERROR, "packet buffer is too small\n");
320  return AVERROR_BUG;
321  }
322  av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
323  av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);
324  }
325  if (ret < 0) {
326  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
327  break;
328  }
329  }
330  if (ret < 0) {
331  av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
332  return vorbis_error_to_averror(ret);
333  }
334 
335  /* check for available packets */
336  if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))
337  return 0;
338 
339  av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
340 
341  if ((ret = ff_alloc_packet2(avctx, avpkt, op.bytes, 0)) < 0)
342  return ret;
343  av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);
344 
345  avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);
346 
347  duration = av_vorbis_parse_frame(s->vp, avpkt->data, avpkt->size);
348  if (duration > 0) {
349  /* we do not know encoder delay until we get the first packet from
350  * libvorbis, so we have to update the AudioFrameQueue counts */
351  if (!avctx->initial_padding && s->afq.frames) {
352  avctx->initial_padding = duration;
354  s->afq.frames->duration += duration;
355  if (s->afq.frames->pts != AV_NOPTS_VALUE)
356  s->afq.frames->pts -= duration;
358  }
359  ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);
360  }
361 
362  *got_packet_ptr = 1;
363  return 0;
364 }
365 
367  .name = "libvorbis",
368  .long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
369  .type = AVMEDIA_TYPE_AUDIO,
370  .id = AV_CODEC_ID_VORBIS,
371  .priv_data_size = sizeof(LibvorbisEncContext),
373  .encode2 = libvorbis_encode_frame,
374  .close = libvorbis_encode_close,
376  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
378  .priv_class = &vorbis_class,
379  .defaults = defaults,
380 };
float, planar
Definition: samplefmt.h:69
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int64_t *duration)
Remove frame(s) from the queue.
#define NULL
Definition: coverity.c:32
#define AV_CH_LAYOUT_7POINT1
const char * s
Definition: avisynth_c.h:768
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AudioFrameQueue afq
frame queue for timestamps
Definition: libvorbisenc.c:53
AVOption.
Definition: opt.h:245
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1740
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static av_cold int libvorbis_encode_close(AVCodecContext *avctx)
Definition: libvorbisenc.c:174
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static const AVOption options[]
Definition: libvorbisenc.c:56
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:280
AVVorbisParseContext * av_vorbis_parse_init(const uint8_t *extradata, int extradata_size)
Allocate and initialize the Vorbis parser using headers in the extradata.
int size
Definition: avcodec.h:1601
AudioFrame * frames
AVFifoBuffer * pkt_fifo
output packet buffer
Definition: libvorbisenc.c:47
#define AV_CH_LAYOUT_STEREO
AVCodec.
Definition: avcodec.h:3599
#define AV_CH_LAYOUT_5POINT0
static int xiph_len(int l)
Definition: libvorbisenc.c:169
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
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
#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: avcodec.h:983
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
double iblock
impulse block bias option
Definition: libvorbisenc.c:51
AVOptions.
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1618
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
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1790
int64_t duration
Definition: movenc.c:63
static AVFrame * frame
AVClass * av_class
class for AVOptions
Definition: libvorbisenc.c:43
uint8_t * data
Definition: avcodec.h:1600
A public API for Vorbis parsing.
static const AVCodecDefault defaults[]
Definition: libvorbisenc.c:61
static av_cold int libvorbis_encode_init(AVCodecContext *avctx)
Definition: libvorbisenc.c:195
AVVorbisParseContext * vp
parse context to get durations
Definition: libvorbisenc.c:52
static const uint8_t header[24]
Definition: sdr2.c:67
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:275
#define BUFFER_SIZE
Definition: libvorbisenc.c:40
static const AVClass vorbis_class
Definition: libvorbisenc.c:66
#define AV_CH_LAYOUT_5POINT1
const AVS_VideoInfo * vi
Definition: avisynth_c.h:795
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void av_vorbis_parse_free(AVVorbisParseContext **s)
Free the parser and everything associated with it.
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
vorbis_comment vc
VorbisComment info.
Definition: libvorbisenc.c:50
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int initial_padding
Audio only.
Definition: avcodec.h:3365
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 flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1770
simple assert() macros that are a bit more flexible than ISO C assert().
#define AV_CH_LAYOUT_QUAD
const char * name
Name of the codec implementation.
Definition: avcodec.h:3606
AVCodec ff_libvorbis_encoder
Definition: libvorbisenc.c:366
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2488
static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: libvorbisenc.c:274
#define AV_CH_LAYOUT_2_2
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:2682
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:885
#define AV_CODEC_FLAG_QSCALE
Use fixed qscale.
Definition: avcodec.h:832
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: avcodec.h:988
#define AV_CH_FRONT_CENTER
#define AV_CH_LAYOUT_5POINT1_BACK
vorbis_info vi
vorbis_info used during init
Definition: libvorbisenc.c:44
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.
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2457
const uint8_t ff_vorbis_encoding_channel_layout_offsets[8][8]
Definition: vorbis_data.c:36
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
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 sample_rate
samples per second
Definition: avcodec.h:2437
static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, int64_t *fpos)
find the next Ogg packet
Definition: oggdec.c:458
main external API structure.
Definition: avcodec.h:1675
int dsp_initialized
vd has been initialized
Definition: libvorbisenc.c:49
a very simple circular buffer FIFO implementation
int eof
end-of-file flag
Definition: libvorbisenc.c:48
static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
Definition: libvorbisenc.c:83
int extradata_size
Definition: avcodec.h:1791
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:3720
Describe the class of an AVClass context structure.
Definition: log.h:67
#define LIBVORBIS_FRAME_SIZE
Definition: libvorbisenc.c:38
#define AV_CH_LAYOUT_5POINT0_BACK
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1710
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1756
#define AV_CH_BACK_CENTER
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:78
static int vorbis_error_to_averror(int ov_err)
Definition: libvorbisenc.c:73
common internal api header.
int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf, int buf_size)
Get the duration for a Vorbis packet.
static double c[64]
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:733
void * priv_data
Definition: avcodec.h:1717
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:2481
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
int channels
number of audio channels
Definition: avcodec.h:2438
#define FF_QP2LAMBDA
factor to convert from H.263 QP to lambda
Definition: avutil.h:221
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
#define LIBAVCODEC_IDENT
Definition: version.h:42
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
#define av_freep(p)
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
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:249
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:231
vorbis_dsp_state vd
DSP state used for analysis.
Definition: libvorbisenc.c:45
This structure stores compressed data.
Definition: avcodec.h:1577
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:241
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1593
vorbis_block vb
vorbis_block used for analysis
Definition: libvorbisenc.c:46
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242
GLuint buffer
Definition: opengl_enc.c:102
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2675
const char * name
Definition: opengl_enc.c:103