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/**
* @file audiounit/recorder.c AudioUnit input recorder
*
* Copyright (C) 2010 Creytiv.com
*/
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h>
#include <pthread.h>
#include <re.h>
#include <baresip.h>
#include "audiounit.h"
struct ausrc_st {
const struct ausrc *as; /* inheritance */
struct audiosess_st *sess;
AudioUnit au;
pthread_mutex_t mutex;
int ch;
ausrc_read_h *rh;
void *arg;
};
static void ausrc_destructor(void *arg)
{
struct ausrc_st *st = arg;
pthread_mutex_lock(&st->mutex);
st->rh = NULL;
pthread_mutex_unlock(&st->mutex);
AudioOutputUnitStop(st->au);
AudioUnitUninitialize(st->au);
AudioComponentInstanceDispose(st->au);
mem_deref(st->sess);
pthread_mutex_destroy(&st->mutex);
}
static OSStatus input_callback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData)
{
struct ausrc_st *st = inRefCon;
AudioBufferList abl;
OSStatus ret;
ausrc_read_h *rh;
void *arg;
(void)ioData;
pthread_mutex_lock(&st->mutex);
rh = st->rh;
arg = st->arg;
pthread_mutex_unlock(&st->mutex);
if (!rh)
return 0;
abl.mNumberBuffers = 1;
abl.mBuffers[0].mNumberChannels = st->ch;
abl.mBuffers[0].mData = NULL;
abl.mBuffers[0].mDataByteSize = inNumberFrames * 2;
ret = AudioUnitRender(st->au,
ioActionFlags,
inTimeStamp,
inBusNumber,
inNumberFrames,
&abl);
if (ret)
return ret;
rh(abl.mBuffers[0].mData, abl.mBuffers[0].mDataByteSize/2, arg);
return 0;
}
static void interrupt_handler(bool interrupted, void *arg)
{
struct ausrc_st *st = arg;
if (interrupted)
AudioOutputUnitStop(st->au);
else
AudioOutputUnitStart(st->au);
}
int audiounit_recorder_alloc(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *device,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
AudioStreamBasicDescription fmt;
AudioUnitElement inputBus = 1;
AURenderCallbackStruct cb;
struct ausrc_st *st;
UInt32 enable = 1;
OSStatus ret = 0;
int err;
(void)ctx;
(void)device;
(void)errh;
st = mem_zalloc(sizeof(*st), ausrc_destructor);
if (!st)
return ENOMEM;
st->as = as;
st->rh = rh;
st->arg = arg;
st->ch = prm->ch;
err = pthread_mutex_init(&st->mutex, NULL);
if (err)
goto out;
err = audiosess_alloc(&st->sess, interrupt_handler, st);
if (err)
goto out;
ret = AudioComponentInstanceNew(output_comp, &st->au);
if (ret)
goto out;
ret = AudioUnitSetProperty(st->au, kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input, inputBus,
&enable, sizeof(enable));
if (ret)
goto out;
fmt.mSampleRate = prm->srate;
fmt.mFormatID = kAudioFormatLinearPCM;
#if TARGET_OS_IPHONE
fmt.mFormatFlags = kAudioFormatFlagsCanonical;
#else
fmt.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked;
#endif
fmt.mBitsPerChannel = 16;
fmt.mChannelsPerFrame = prm->ch;
fmt.mBytesPerFrame = 2 * prm->ch;
fmt.mFramesPerPacket = 1;
fmt.mBytesPerPacket = 2 * prm->ch;
fmt.mReserved = 0;
ret = AudioUnitSetProperty(st->au, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, inputBus,
&fmt, sizeof(fmt));
if (ret)
goto out;
/* NOTE: done after desc */
ret = AudioUnitInitialize(st->au);
if (ret)
goto out;
cb.inputProc = input_callback;
cb.inputProcRefCon = st;
ret = AudioUnitSetProperty(st->au,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global, inputBus,
&cb, sizeof(cb));
if (ret)
goto out;
ret = AudioOutputUnitStart(st->au);
if (ret)
goto out;
out:
if (ret) {
warning("audiounit: record failed: %d (%c%c%c%c)\n", ret,
ret>>24, ret>>16, ret>>8, ret);
err = ENODEV;
}
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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