FFmpeg
sbcenc.c
Go to the documentation of this file.
1 /*
2  * Bluetooth low-complexity, subband codec (SBC)
3  *
4  * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
5  * Copyright (C) 2012-2013 Intel Corporation
6  * Copyright (C) 2008-2010 Nokia Corporation
7  * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
8  * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
9  * Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com>
10  *
11  * This file is part of FFmpeg.
12  *
13  * FFmpeg is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * FFmpeg is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * SBC encoder implementation
31  */
32 
34 #include "libavutil/emms.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "codec_internal.h"
38 #include "encode.h"
39 #include "profiles.h"
40 #include "put_bits.h"
41 #include "sbc.h"
42 #include "sbcdsp.h"
43 
44 typedef struct SBCEncContext {
45  AVClass *class;
46  int64_t max_delay;
47  int msbc;
49  DECLARE_ALIGNED(SBC_ALIGN, SBCDSPContext, dsp);
51 
52 static int sbc_analyze_audio(SBCDSPContext *s, struct sbc_frame *frame)
53 {
54  int ch, blk;
55  int16_t *x;
56 
57  switch (frame->subbands) {
58  case 4:
59  for (ch = 0; ch < frame->channels; ch++) {
60  x = &s->X[ch][s->position - 4 *
61  s->increment + frame->blocks * 4];
62  for (blk = 0; blk < frame->blocks;
63  blk += s->increment) {
64  s->sbc_analyze_4s(
65  s, x,
66  frame->sb_sample_f[blk][ch],
67  frame->sb_sample_f[blk + 1][ch] -
68  frame->sb_sample_f[blk][ch]);
69  x -= 4 * s->increment;
70  }
71  }
72  return frame->blocks * 4;
73 
74  case 8:
75  for (ch = 0; ch < frame->channels; ch++) {
76  x = &s->X[ch][s->position - 8 *
77  s->increment + frame->blocks * 8];
78  for (blk = 0; blk < frame->blocks;
79  blk += s->increment) {
80  s->sbc_analyze_8s(
81  s, x,
82  frame->sb_sample_f[blk][ch],
83  frame->sb_sample_f[blk + 1][ch] -
84  frame->sb_sample_f[blk][ch]);
85  x -= 8 * s->increment;
86  }
87  }
88  return frame->blocks * 8;
89 
90  default:
91  return AVERROR(EIO);
92  }
93 }
94 
95 /*
96  * Packs the SBC frame from frame into the memory in avpkt.
97  * Returns the length of the packed frame.
98  */
99 static size_t sbc_pack_frame(AVPacket *avpkt, struct sbc_frame *frame,
100  int joint, int msbc)
101 {
102  PutBitContext pb;
103 
104  /* Will copy the header parts for CRC-8 calculation here */
105  uint8_t crc_header[11] = { 0 };
106  int crc_pos;
107 
108  uint32_t audio_sample;
109 
110  int ch, sb, blk; /* channel, subband, block and bit counters */
111  int bits[2][8]; /* bits distribution */
112  uint32_t levels[2][8]; /* levels are derived from that */
113  uint32_t sb_sample_delta[2][8];
114 
115  if (msbc) {
116  avpkt->data[0] = MSBC_SYNCWORD;
117  avpkt->data[1] = 0;
118  avpkt->data[2] = 0;
119  } else {
120  avpkt->data[0] = SBC_SYNCWORD;
121 
122  avpkt->data[1] = (frame->frequency & 0x03) << 6;
123  avpkt->data[1] |= (((frame->blocks >> 2) - 1) & 0x03) << 4;
124  avpkt->data[1] |= (frame->mode & 0x03) << 2;
125  avpkt->data[1] |= (frame->allocation & 0x01) << 1;
126  avpkt->data[1] |= ((frame->subbands == 8) & 0x01) << 0;
127 
128  avpkt->data[2] = frame->bitpool;
129 
130  if (frame->bitpool > frame->subbands << (4 + (frame->mode == STEREO
131  || frame->mode == JOINT_STEREO)))
132  return -5;
133  }
134 
135  /* Can't fill in crc yet */
136  crc_header[0] = avpkt->data[1];
137  crc_header[1] = avpkt->data[2];
138  crc_pos = 16;
139 
140  init_put_bits(&pb, avpkt->data + 4, avpkt->size);
141 
142  if (frame->mode == JOINT_STEREO) {
143  put_bits(&pb, frame->subbands, joint);
144  crc_header[crc_pos >> 3] = joint;
145  crc_pos += frame->subbands;
146  }
147 
148  for (ch = 0; ch < frame->channels; ch++) {
149  for (sb = 0; sb < frame->subbands; sb++) {
150  put_bits(&pb, 4, frame->scale_factor[ch][sb] & 0x0F);
151  crc_header[crc_pos >> 3] <<= 4;
152  crc_header[crc_pos >> 3] |= frame->scale_factor[ch][sb] & 0x0F;
153  crc_pos += 4;
154  }
155  }
156 
157  /* align the last crc byte */
158  if (crc_pos % 8)
159  crc_header[crc_pos >> 3] <<= 8 - (crc_pos % 8);
160 
161  avpkt->data[3] = ff_sbc_crc8(frame->crc_ctx, crc_header, crc_pos);
162 
164 
165  for (ch = 0; ch < frame->channels; ch++) {
166  for (sb = 0; sb < frame->subbands; sb++) {
167  levels[ch][sb] = ((1 << bits[ch][sb]) - 1) <<
168  (32 - (frame->scale_factor[ch][sb] +
169  SCALE_OUT_BITS + 2));
170  sb_sample_delta[ch][sb] = (uint32_t) 1 <<
171  (frame->scale_factor[ch][sb] +
172  SCALE_OUT_BITS + 1);
173  }
174  }
175 
176  for (blk = 0; blk < frame->blocks; blk++) {
177  for (ch = 0; ch < frame->channels; ch++) {
178  for (sb = 0; sb < frame->subbands; sb++) {
179 
180  if (bits[ch][sb] == 0)
181  continue;
182 
183  audio_sample = ((uint64_t) levels[ch][sb] *
184  (sb_sample_delta[ch][sb] +
185  frame->sb_sample_f[blk][ch][sb])) >> 32;
186 
187  put_bits(&pb, bits[ch][sb], audio_sample);
188  }
189  }
190  }
191 
192  flush_put_bits(&pb);
193 
194  return put_bytes_output(&pb);
195 }
196 
197 static int sbc_encode_init(AVCodecContext *avctx)
198 {
199  SBCEncContext *sbc = avctx->priv_data;
200  struct sbc_frame *frame = &sbc->frame;
201 
202  if (avctx->profile == AV_PROFILE_SBC_MSBC)
203  sbc->msbc = 1;
204 
205  if (sbc->msbc) {
206  if (avctx->ch_layout.nb_channels != 1) {
207  av_log(avctx, AV_LOG_ERROR, "mSBC require mono channel.\n");
208  return AVERROR(EINVAL);
209  }
210 
211  if (avctx->sample_rate != 16000) {
212  av_log(avctx, AV_LOG_ERROR, "mSBC require 16 kHz samplerate.\n");
213  return AVERROR(EINVAL);
214  }
215 
216  frame->mode = SBC_MODE_MONO;
217  frame->subbands = 8;
218  frame->blocks = MSBC_BLOCKS;
219  frame->allocation = SBC_AM_LOUDNESS;
220  frame->bitpool = 26;
221 
222  avctx->frame_size = 8 * MSBC_BLOCKS;
223  } else {
224  int d;
225 
226  if (avctx->global_quality > 255*FF_QP2LAMBDA) {
227  av_log(avctx, AV_LOG_ERROR, "bitpool > 255 is not allowed.\n");
228  return AVERROR(EINVAL);
229  }
230 
231  if (avctx->ch_layout.nb_channels == 1) {
232  frame->mode = SBC_MODE_MONO;
233  if (sbc->max_delay <= 3000 || avctx->bit_rate > 270000)
234  frame->subbands = 4;
235  else
236  frame->subbands = 8;
237  } else {
238  if (avctx->bit_rate < 180000 || avctx->bit_rate > 420000)
240  else
241  frame->mode = SBC_MODE_STEREO;
242  if (sbc->max_delay <= 4000 || avctx->bit_rate > 420000)
243  frame->subbands = 4;
244  else
245  frame->subbands = 8;
246  }
247  /* sbc algorithmic delay is ((blocks + 10) * subbands - 2) / sample_rate */
248  frame->blocks = av_clip(((sbc->max_delay * avctx->sample_rate + 2)
249  / (1000000 * frame->subbands)) - 10, 4, 16) & ~3;
250 
251  frame->allocation = SBC_AM_LOUDNESS;
252 
253  d = frame->blocks * ((frame->mode == SBC_MODE_DUAL_CHANNEL) + 1);
254  frame->bitpool = (((avctx->bit_rate * frame->subbands * frame->blocks) / avctx->sample_rate)
255  - 4 * frame->subbands * avctx->ch_layout.nb_channels
256  - (frame->mode == SBC_MODE_JOINT_STEREO)*frame->subbands - 32 + d/2) / d;
257  if (avctx->global_quality > 0)
258  frame->bitpool = avctx->global_quality / FF_QP2LAMBDA;
259 
260  avctx->frame_size = 4*((frame->subbands >> 3) + 1) * 4*(frame->blocks >> 2);
261  }
262 
263  for (int i = 0; avctx->codec->supported_samplerates[i]; i++)
264  if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
265  frame->frequency = i;
266 
268  frame->codesize = frame->subbands * frame->blocks * avctx->ch_layout.nb_channels * 2;
269  frame->crc_ctx = av_crc_get_table(AV_CRC_8_EBU);
270 
271  memset(&sbc->dsp.X, 0, sizeof(sbc->dsp.X));
272  sbc->dsp.position = (SBC_X_BUFFER_SIZE - frame->subbands * 9) & ~7;
273  sbc->dsp.increment = sbc->msbc ? 1 : 4;
274  ff_sbcdsp_init(&sbc->dsp);
275 
276  return 0;
277 }
278 
279 static int sbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
280  const AVFrame *av_frame, int *got_packet_ptr)
281 {
282  SBCEncContext *sbc = avctx->priv_data;
283  struct sbc_frame *frame = &sbc->frame;
284  uint8_t joint = frame->mode == SBC_MODE_JOINT_STEREO;
285  uint8_t dual = frame->mode == SBC_MODE_DUAL_CHANNEL;
286  int ret, j = 0;
287 
288  int frame_length = 4 + (4 * frame->subbands * frame->channels) / 8
289  + ((frame->blocks * frame->bitpool * (1 + dual)
290  + joint * frame->subbands) + 7) / 8;
291 
292  /* input must be large enough to encode a complete frame */
293  if (av_frame->nb_samples * frame->channels * 2 < frame->codesize)
294  return 0;
295 
296  if ((ret = ff_get_encode_buffer(avctx, avpkt, frame_length, 0)) < 0)
297  return ret;
298 
299  /* Select the needed input data processing function and call it */
300  if (frame->subbands == 8)
301  sbc->dsp.position = sbc->dsp.sbc_enc_process_input_8s(
302  sbc->dsp.position, av_frame->data[0], sbc->dsp.X,
303  frame->subbands * frame->blocks, frame->channels);
304  else
305  sbc->dsp.position = sbc->dsp.sbc_enc_process_input_4s(
306  sbc->dsp.position, av_frame->data[0], sbc->dsp.X,
307  frame->subbands * frame->blocks, frame->channels);
308 
309  sbc_analyze_audio(&sbc->dsp, &sbc->frame);
310 
311  if (frame->mode == JOINT_STEREO)
312  j = sbc->dsp.sbc_calc_scalefactors_j(frame->sb_sample_f,
313  frame->scale_factor,
314  frame->blocks,
315  frame->subbands);
316  else
317  sbc->dsp.sbc_calc_scalefactors(frame->sb_sample_f,
318  frame->scale_factor,
319  frame->blocks,
320  frame->channels,
321  frame->subbands);
322  emms_c();
323  sbc_pack_frame(avpkt, frame, j, sbc->msbc);
324 
325  *got_packet_ptr = 1;
326  return 0;
327 }
328 
329 #define OFFSET(x) offsetof(SBCEncContext, x)
330 #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
331 static const AVOption options[] = {
332  { "sbc_delay", "set maximum algorithmic latency",
333  OFFSET(max_delay), AV_OPT_TYPE_DURATION, {.i64 = 13000}, 1000,13000, AE },
334  { "msbc", "use mSBC mode (wideband speech mono SBC)",
335  OFFSET(msbc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AE },
337  { NULL },
338 };
339 
340 static const AVClass sbc_class = {
341  .class_name = "sbc encoder",
342  .item_name = av_default_item_name,
343  .option = options,
344  .version = LIBAVUTIL_VERSION_INT,
345 };
346 
348  .p.name = "sbc",
349  CODEC_LONG_NAME("SBC (low-complexity subband codec)"),
350  .p.type = AVMEDIA_TYPE_AUDIO,
351  .p.id = AV_CODEC_ID_SBC,
352  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME |
354  .priv_data_size = sizeof(SBCEncContext),
358  .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO,
360  { 0 } },
361  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
363  .p.supported_samplerates = (const int[]) { 16000, 32000, 44100, 48000, 0 },
364  .p.priv_class = &sbc_class,
365  .p.profiles = NULL_IF_CONFIG_SMALL(ff_sbc_profiles),
366 };
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1096
av_clip
#define av_clip
Definition: common.h:98
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
AV_CRC_8_EBU
@ AV_CRC_8_EBU
Definition: crc.h:56
MSBC_SYNCWORD
#define MSBC_SYNCWORD
Definition: sbc.h:71
JOINT_STEREO
#define JOINT_STEREO
Definition: atrac3.c:58
OFFSET
#define OFFSET(x)
Definition: sbcenc.c:329
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:389
put_bytes_output
static int put_bytes_output(const PutBitContext *s)
Definition: put_bits.h:89
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1068
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:214
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:222
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVOption
AVOption.
Definition: opt.h:294
encode.h
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:239
FFCodec
Definition: codec_internal.h:127
STEREO
#define STEREO
Definition: cook.c:64
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:323
sbc_analyze_audio
static int sbc_analyze_audio(SBCDSPContext *s, struct sbc_frame *frame)
Definition: sbcenc.c:52
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
MSBC_BLOCKS
#define MSBC_BLOCKS
Definition: sbc.h:41
SBCEncContext::dsp
SBCDSPContext dsp
Definition: sbcenc.c:49
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
options
static const AVOption options[]
Definition: sbcenc.c:331
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:454
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2111
sbcdsp.h
AVFrame::channels
attribute_deprecated int channels
number of audio channels, only used for audio.
Definition: frame.h:731
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:315
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:215
SBCEncContext::msbc
int msbc
Definition: sbcenc.c:47
AV_CODEC_ID_SBC
@ AV_CODEC_ID_SBC
Definition: codec_id.h:530
AVCodec::supported_samplerates
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0
Definition: codec.h:210
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
emms_c
#define emms_c()
Definition: emms.h:63
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:511
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
FF_AVCTX_PROFILE_OPTION
#define FF_AVCTX_PROFILE_OPTION(name, description, type, value)
Definition: profiles.h:25
AE
#define AE
Definition: sbcenc.c:330
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
This encoder can reorder user opaque values from input AVFrames and return them with corresponding ou...
Definition: codec.h:159
bits
uint8_t bits
Definition: vp3data.h:128
CODEC_OLD_CHANNEL_LAYOUTS
#define CODEC_OLD_CHANNEL_LAYOUTS(...)
Definition: codec_internal.h:302
ff_sbcdsp_init
av_cold void ff_sbcdsp_init(SBCDSPContext *s)
Definition: sbcdsp.c:364
SBCEncContext::max_delay
int64_t max_delay
Definition: sbcenc.c:46
SBC_SYNCWORD
#define SBC_SYNCWORD
Definition: sbc.h:70
blk
#define blk(i)
Definition: sha.c:186
PutBitContext
Definition: put_bits.h:50
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
SBCEncContext
Definition: sbcenc.c:44
frame
static AVFrame * frame
Definition: demux_decode.c:54
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
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:495
SBC_MODE_STEREO
#define SBC_MODE_STEREO
Definition: sbc.h:58
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
profiles.h
SBC_AM_LOUDNESS
#define SBC_AM_LOUDNESS
Definition: sbc.h:62
SBC_ALIGN
#define SBC_ALIGN
Definition: sbc.h:80
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:365
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:523
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:313
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
sbc_encode_frame
static int sbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *av_frame, int *got_packet_ptr)
Definition: sbcenc.c:279
SBC_MODE_MONO
#define SBC_MODE_MONO
Definition: sbc.h:56
av_crc_get_table
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
sbc_encode_init
static int sbc_encode_init(AVCodecContext *avctx)
Definition: sbcenc.c:197
sbc.h
emms.h
SBC_X_BUFFER_SIZE
#define SBC_X_BUFFER_SIZE
Definition: sbcdsp.h:41
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:420
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
sbc_frame
Definition: sbc.h:84
sbc_frame::joint
uint8_t joint
Definition: sbc.h:103
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
ff_sbc_encoder
const FFCodec ff_sbc_encoder
Definition: sbcenc.c:347
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
ff_sbc_profiles
const AVProfile ff_sbc_profiles[]
Definition: profiles.c:167
ff_sbc_crc8
uint8_t ff_sbc_crc8(const AVCRC *ctx, const uint8_t *data, size_t len)
Definition: sbc.c:54
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
SBCEncContext::frame
struct sbc_frame frame
Definition: sbcenc.c:48
sbc_class
static const AVClass sbc_class
Definition: sbcenc.c:340
AVCodecContext
main external API structure.
Definition: avcodec.h:445
channel_layout.h
AV_PROFILE_SBC_MSBC
#define AV_PROFILE_SBC_MSBC
Definition: defs.h:177
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:105
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:1600
SCALE_OUT_BITS
#define SCALE_OUT_BITS
Definition: sbcdsp.h:40
ff_sbc_calculate_bits
void ff_sbc_calculate_bits(const struct sbc_frame *frame, int(*bits)[8])
Definition: sbc.c:78
SBC_MODE_DUAL_CHANNEL
#define SBC_MODE_DUAL_CHANNEL
Definition: sbc.h:57
sbc_pack_frame
static size_t sbc_pack_frame(AVPacket *avpkt, struct sbc_frame *frame, int joint, int msbc)
Definition: sbcenc.c:99
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:388
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:244
d
d
Definition: ffmpeg_filter.c:424
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
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
SBC_MODE_JOINT_STEREO
#define SBC_MODE_JOINT_STEREO
Definition: sbc.h:59
put_bits.h