FFmpeg
audiotoolbox.m
Go to the documentation of this file.
1 /*
2  * AudioToolbox output device
3  * Copyright (c) 2020 Thilo Borgmann <thilo.borgmann@mail.de>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * AudioToolbox output device
25  * @author Thilo Borgmann <thilo.borgmann@mail.de>
26  */
27 
28 #import <AudioToolbox/AudioToolbox.h>
29 #include <pthread.h>
30 
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include "libavformat/internal.h"
34 #include "libavformat/mux.h"
35 #include "libavutil/internal.h"
36 #include "avdevice.h"
37 
38 typedef struct
39 {
40  AVClass *class;
41 
42  AudioQueueBufferRef buffer[2];
43  pthread_mutex_t buffer_lock[2];
44  int cur_buf;
45  AudioQueueRef queue;
46 
49 
50 } ATContext;
51 
52 static int check_status(AVFormatContext *avctx, OSStatus *status, const char *msg)
53 {
54  if (*status != noErr) {
55  av_log(avctx, AV_LOG_ERROR, "Error: %s (%i)\n", msg, *status);
56  return 1;
57  } else {
58  av_log(avctx, AV_LOG_DEBUG, " OK : %s\n", msg);
59  return 0;
60  }
61 }
62 
63 static void queue_callback(void* atctx, AudioQueueRef inAQ,
64  AudioQueueBufferRef inBuffer)
65 {
66  // unlock the buffer that has just been consumed
67  ATContext *ctx = (ATContext*)atctx;
68  for (int i = 0; i < 2; i++) {
69  if (inBuffer == ctx->buffer[i]) {
70  pthread_mutex_unlock(&ctx->buffer_lock[i]);
71  }
72  }
73 }
74 
76 {
77  ATContext *ctx = (ATContext*)avctx->priv_data;
78  OSStatus err = noErr;
79  CFStringRef device_UID = NULL;
80  AudioDeviceID *devices;
81  int num_devices;
82 
83 
84  // get devices
85  UInt32 data_size = 0;
86  AudioObjectPropertyAddress prop;
87  prop.mSelector = kAudioHardwarePropertyDevices;
88  prop.mScope = kAudioObjectPropertyScopeGlobal;
89 #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 120000
90  prop.mElement = kAudioObjectPropertyElementMain;
91 #else
92  prop.mElement = kAudioObjectPropertyElementMaster;
93 #endif
94  err = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &prop, 0, NULL, &data_size);
95  if (check_status(avctx, &err, "AudioObjectGetPropertyDataSize devices"))
96  return AVERROR(EINVAL);
97 
98  num_devices = data_size / sizeof(AudioDeviceID);
99 
100  devices = (AudioDeviceID*)(av_malloc(data_size));
101  err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &prop, 0, NULL, &data_size, devices);
102  if (check_status(avctx, &err, "AudioObjectGetPropertyData devices")) {
103  av_freep(&devices);
104  return AVERROR(EINVAL);
105  }
106 
107  // list devices
108  if (ctx->list_devices) {
109  CFStringRef device_name = NULL;
110  prop.mScope = kAudioDevicePropertyScopeInput;
111 
112  av_log(ctx, AV_LOG_INFO, "CoreAudio devices:\n");
113  for(UInt32 i = 0; i < num_devices; ++i) {
114  // UID
115  data_size = sizeof(device_UID);
116  prop.mSelector = kAudioDevicePropertyDeviceUID;
117  err = AudioObjectGetPropertyData(devices[i], &prop, 0, NULL, &data_size, &device_UID);
118  if (check_status(avctx, &err, "AudioObjectGetPropertyData UID"))
119  continue;
120 
121  // name
122  data_size = sizeof(device_name);
123  prop.mSelector = kAudioDevicePropertyDeviceNameCFString;
124  err = AudioObjectGetPropertyData(devices[i], &prop, 0, NULL, &data_size, &device_name);
125  if (check_status(avctx, &err, "AudioObjecTGetPropertyData name"))
126  continue;
127 
128  av_log(ctx, AV_LOG_INFO, "[%d] %30s, %s\n", i,
129  CFStringGetCStringPtr(device_name, kCFStringEncodingMacRoman),
130  CFStringGetCStringPtr(device_UID, kCFStringEncodingMacRoman));
131  }
132  }
133 
134  // get user-defined device UID or use default device
135  // -audio_device_index overrides any URL given
136  const char *stream_name = avctx->url;
137  if (stream_name && ctx->audio_device_index == -1) {
138  sscanf(stream_name, "%d", &ctx->audio_device_index);
139  }
140 
141  if (ctx->audio_device_index >= 0) {
142  // get UID of selected device
143  data_size = sizeof(device_UID);
144  prop.mSelector = kAudioDevicePropertyDeviceUID;
145  err = AudioObjectGetPropertyData(devices[ctx->audio_device_index], &prop, 0, NULL, &data_size, &device_UID);
146  if (check_status(avctx, &err, "AudioObjecTGetPropertyData UID")) {
147  av_freep(&devices);
148  return AVERROR(EINVAL);
149  }
150  } else {
151  // use default device
152  device_UID = NULL;
153  }
154 
155  av_log(ctx, AV_LOG_DEBUG, "stream_name: %s\n", stream_name);
156  av_log(ctx, AV_LOG_DEBUG, "audio_device_idnex: %i\n", ctx->audio_device_index);
157  av_log(ctx, AV_LOG_DEBUG, "UID: %s\n", CFStringGetCStringPtr(device_UID, kCFStringEncodingMacRoman));
158 
159  // check input stream
160  if (avctx->nb_streams != 1 || avctx->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
161  av_log(ctx, AV_LOG_ERROR, "Only a single audio stream is supported.\n");
162  return AVERROR(EINVAL);
163  }
164 
165  av_freep(&devices);
166  AVCodecParameters *codecpar = avctx->streams[0]->codecpar;
167 
168  // audio format
169  AudioStreamBasicDescription device_format = {0};
170  device_format.mSampleRate = codecpar->sample_rate;
171  device_format.mFormatID = kAudioFormatLinearPCM;
172  device_format.mFormatFlags |= (codecpar->format == AV_SAMPLE_FMT_FLT) ? kLinearPCMFormatFlagIsFloat : 0;
173  device_format.mFormatFlags |= (codecpar->codec_id == AV_CODEC_ID_PCM_S8) ? kLinearPCMFormatFlagIsSignedInteger : 0;
174  device_format.mFormatFlags |= (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)) ? kLinearPCMFormatFlagIsSignedInteger : 0;
175  device_format.mFormatFlags |= (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S24BE, AV_CODEC_ID_PCM_S24LE)) ? kLinearPCMFormatFlagIsSignedInteger : 0;
176  device_format.mFormatFlags |= (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S32BE, AV_CODEC_ID_PCM_S32LE)) ? kLinearPCMFormatFlagIsSignedInteger : 0;
177  device_format.mFormatFlags |= (av_sample_fmt_is_planar(codecpar->format)) ? kAudioFormatFlagIsNonInterleaved : 0;
178  device_format.mFormatFlags |= (codecpar->codec_id == AV_CODEC_ID_PCM_F32BE) ? kAudioFormatFlagIsBigEndian : 0;
179  device_format.mFormatFlags |= (codecpar->codec_id == AV_CODEC_ID_PCM_S16BE) ? kAudioFormatFlagIsBigEndian : 0;
180  device_format.mFormatFlags |= (codecpar->codec_id == AV_CODEC_ID_PCM_S24BE) ? kAudioFormatFlagIsBigEndian : 0;
181  device_format.mFormatFlags |= (codecpar->codec_id == AV_CODEC_ID_PCM_S32BE) ? kAudioFormatFlagIsBigEndian : 0;
182  device_format.mChannelsPerFrame = codecpar->ch_layout.nb_channels;
183  device_format.mBitsPerChannel = (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S24BE, AV_CODEC_ID_PCM_S24LE)) ? 24 : (av_get_bytes_per_sample(codecpar->format) << 3);
184  device_format.mBytesPerFrame = (device_format.mBitsPerChannel >> 3) * device_format.mChannelsPerFrame;
185  device_format.mFramesPerPacket = 1;
186  device_format.mBytesPerPacket = device_format.mBytesPerFrame * device_format.mFramesPerPacket;
187  device_format.mReserved = 0;
188 
189  av_log(ctx, AV_LOG_DEBUG, "device_format.mSampleRate = %i\n", codecpar->sample_rate);
190  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatID = %s\n", "kAudioFormatLinearPCM");
191  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->format == AV_SAMPLE_FMT_FLT) ? "kLinearPCMFormatFlagIsFloat" : "0");
192  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_CODEC_ID_PCM_S8) ? "kLinearPCMFormatFlagIsSignedInteger" : "0");
193  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S32BE, AV_CODEC_ID_PCM_S32LE)) ? "kLinearPCMFormatFlagIsSignedInteger" : "0");
194  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)) ? "kLinearPCMFormatFlagIsSignedInteger" : "0");
195  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_NE(AV_CODEC_ID_PCM_S24BE, AV_CODEC_ID_PCM_S24LE)) ? "kLinearPCMFormatFlagIsSignedInteger" : "0");
196  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (av_sample_fmt_is_planar(codecpar->format)) ? "kAudioFormatFlagIsNonInterleaved" : "0");
197  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_CODEC_ID_PCM_F32BE) ? "kAudioFormatFlagIsBigEndian" : "0");
198  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_CODEC_ID_PCM_S16BE) ? "kAudioFormatFlagIsBigEndian" : "0");
199  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_CODEC_ID_PCM_S24BE) ? "kAudioFormatFlagIsBigEndian" : "0");
200  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags |= %s\n", (codecpar->codec_id == AV_CODEC_ID_PCM_S32BE) ? "kAudioFormatFlagIsBigEndian" : "0");
201  av_log(ctx, AV_LOG_DEBUG, "device_format.mFormatFlags == %i\n", device_format.mFormatFlags);
202  av_log(ctx, AV_LOG_DEBUG, "device_format.mChannelsPerFrame = %i\n", codecpar->ch_layout.nb_channels);
203  av_log(ctx, AV_LOG_DEBUG, "device_format.mBitsPerChannel = %i\n", av_get_bytes_per_sample(codecpar->format) << 3);
204  av_log(ctx, AV_LOG_DEBUG, "device_format.mBytesPerFrame = %i\n", (device_format.mBitsPerChannel >> 3) * codecpar->ch_layout.nb_channels);
205  av_log(ctx, AV_LOG_DEBUG, "device_format.mBytesPerPacket = %i\n", device_format.mBytesPerFrame);
206  av_log(ctx, AV_LOG_DEBUG, "device_format.mFramesPerPacket = %i\n", 1);
207  av_log(ctx, AV_LOG_DEBUG, "device_format.mReserved = %i\n", 0);
208 
209  // create new output queue for the device
210  err = AudioQueueNewOutput(&device_format, queue_callback, ctx,
211  NULL, kCFRunLoopCommonModes,
212  0, &ctx->queue);
213  if (check_status(avctx, &err, "AudioQueueNewOutput")) {
214  if (err == kAudioFormatUnsupportedDataFormatError)
215  av_log(ctx, AV_LOG_ERROR, "Unsupported output format.\n");
216  return AVERROR(EINVAL);
217  }
218 
219  // set user-defined device or leave untouched for default
220  if (device_UID != NULL) {
221  err = AudioQueueSetProperty(ctx->queue, kAudioQueueProperty_CurrentDevice, &device_UID, sizeof(device_UID));
222  if (check_status(avctx, &err, "AudioQueueSetProperty output UID"))
223  return AVERROR(EINVAL);
224  }
225 
226  // start the queue
227  err = AudioQueueStart(ctx->queue, NULL);
228  if (check_status(avctx, &err, "AudioQueueStart"))
229  return AVERROR(EINVAL);
230 
231  // init the mutexes for double-buffering
232  pthread_mutex_init(&ctx->buffer_lock[0], NULL);
233  pthread_mutex_init(&ctx->buffer_lock[1], NULL);
234 
235  return 0;
236 }
237 
239 {
240  ATContext *ctx = (ATContext*)avctx->priv_data;
241  OSStatus err = noErr;
242 
243  // use the other buffer
244  ctx->cur_buf = !ctx->cur_buf;
245 
246  // lock for writing or wait for the buffer to be available
247  // will be unlocked by queue callback
248  pthread_mutex_lock(&ctx->buffer_lock[ctx->cur_buf]);
249 
250  // (re-)allocate the buffer if not existant or of different size
251  if (!ctx->buffer[ctx->cur_buf] || ctx->buffer[ctx->cur_buf]->mAudioDataBytesCapacity != pkt->size) {
252  err = AudioQueueAllocateBuffer(ctx->queue, pkt->size, &ctx->buffer[ctx->cur_buf]);
253  if (check_status(avctx, &err, "AudioQueueAllocateBuffer")) {
254  pthread_mutex_unlock(&ctx->buffer_lock[ctx->cur_buf]);
255  return AVERROR(ENOMEM);
256  }
257  }
258 
259  AudioQueueBufferRef buf = ctx->buffer[ctx->cur_buf];
260 
261  // copy audio data into buffer and enqueue the buffer
262  memcpy(buf->mAudioData, pkt->data, buf->mAudioDataBytesCapacity);
263  buf->mAudioDataByteSize = buf->mAudioDataBytesCapacity;
264  err = AudioQueueEnqueueBuffer(ctx->queue, buf, 0, NULL);
265  if (check_status(avctx, &err, "AudioQueueEnqueueBuffer")) {
266  pthread_mutex_unlock(&ctx->buffer_lock[ctx->cur_buf]);
267  return AVERROR(EINVAL);
268  }
269 
270  return 0;
271 }
272 
274 {
275  ATContext *ctx = (ATContext*)avctx->priv_data;
276  OSStatus err = noErr;
277 
278  pthread_mutex_destroy(&ctx->buffer_lock[0]);
279  pthread_mutex_destroy(&ctx->buffer_lock[1]);
280 
281  err = AudioQueueFlush(ctx->queue);
282  check_status(avctx, &err, "AudioQueueFlush");
283  err = AudioQueueDispose(ctx->queue, true);
284  check_status(avctx, &err, "AudioQueueDispose");
285 
286  return 0;
287 }
288 
289 static const AVOption options[] = {
290  { "list_devices", "list available audio devices", offsetof(ATContext, list_devices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
291  { "audio_device_index", "select audio device by index (starts at 0)", offsetof(ATContext, audio_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
292  { NULL },
293 };
294 
295 static const AVClass at_class = {
296  .class_name = "AudioToolbox",
297  .item_name = av_default_item_name,
298  .option = options,
299  .version = LIBAVUTIL_VERSION_INT,
301 };
302 
304  .p.name = "audiotoolbox",
305  .p.long_name = NULL_IF_CONFIG_SMALL("AudioToolbox output device"),
306  .priv_data_size = sizeof(ATContext),
308  .p.video_codec = AV_CODEC_ID_NONE,
309  .write_header = at_write_header,
310  .write_packet = at_write_packet,
311  .write_trailer = at_write_trailer,
312  .p.flags = AVFMT_NOFILE,
313  .p.priv_class = &at_class,
314 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:328
pthread_mutex_t
_fmutex pthread_mutex_t
Definition: os2threads.h:53
at_write_trailer
static av_cold int at_write_trailer(AVFormatContext *avctx)
Definition: audiotoolbox.m:273
AV_CODEC_ID_PCM_F32BE
@ AV_CODEC_ID_PCM_F32BE
Definition: codec_id.h:348
AVOutputFormat::name
const char * name
Definition: avformat.h:510
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
ATContext::cur_buf
int cur_buf
Definition: audiotoolbox.m:44
pthread_mutex_init
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:104
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1328
AVPacket::data
uint8_t * data
Definition: packet.h:533
AVOption
AVOption.
Definition: opt.h:357
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:321
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:65
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
at_write_packet
static int at_write_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: audiotoolbox.m:238
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:329
ff_audiotoolbox_muxer
const FFOutputFormat ff_audiotoolbox_muxer
Definition: audiotoolbox.m:303
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:332
pkt
AVPacket * pkt
Definition: movenc.c:60
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_NE
#define AV_NE(be, le)
Definition: macros.h:33
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_sample_fmt_is_planar
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:114
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:49
AVFormatContext
Format I/O context.
Definition: avformat.h:1260
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
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
ATContext::list_devices
int list_devices
Definition: audiotoolbox.m:47
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
FFOutputFormat
Definition: mux.h:61
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
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:280
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
pthread_mutex_unlock
#define pthread_mutex_unlock(a)
Definition: ffprobe.c:82
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1316
at_class
static const AVClass at_class
Definition: audiotoolbox.m:295
AV_CODEC_ID_PCM_S24LE
@ AV_CODEC_ID_PCM_S24LE
Definition: codec_id.h:340
at_write_header
static av_cold int at_write_header(AVFormatContext *avctx)
Definition: audiotoolbox.m:75
AVPacket::size
int size
Definition: packet.h:534
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:94
queue_callback
static void queue_callback(void *atctx, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer)
Definition: audiotoolbox.m:63
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1376
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:468
ATContext
Definition: audiotoolbox.m:38
avdevice.h
ATContext::queue
AudioQueueRef queue
Definition: audiotoolbox.m:45
check_status
static int check_status(AVFormatContext *avctx, OSStatus *status, const char *msg)
Definition: audiotoolbox.m:52
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
pthread_mutex_destroy
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:112
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:108
internal.h
AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT
@ AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT
Definition: log.h:42
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:337
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
status
ov_status_e status
Definition: dnn_backend_openvino.c:101
options
static const AVOption options[]
Definition: audiotoolbox.m:289
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
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
AV_CODEC_ID_PCM_S32LE
@ AV_CODEC_ID_PCM_S32LE
Definition: codec_id.h:336
mem.h
AVCodecParameters::format
int format
Definition: codec_par.h:92
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:510
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:261
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ATContext::audio_device_index
int audio_device_index
Definition: audiotoolbox.m:48
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1288
AV_CODEC_ID_PCM_S24BE
@ AV_CODEC_ID_PCM_S24BE
Definition: codec_id.h:341
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:60
pthread_mutex_lock
#define pthread_mutex_lock(a)
Definition: ffprobe.c:78
mux.h