int
coreaudio_object_write(struct audio_object *object,
const void *data,
size_t bytes)
{
struct coreaudio_object *self = to_coreaudio_object(object);
if (!self->initialized)
return noErr;
bool runningAtStart = self->running;
if(!runningAtStart) {
TPCircularBufferClear(&(self->circularBuffer));
}
char *dataPtr = (char*)data;
// copy data to our circular buffer
// Poll while we don't have space in the buffer.
AudioBufferList *bufferList;
UInt32 available;
while(bytes > 0) {
while((!runningAtStart || self->running) && (available = TPCircularBufferGetAvailableSpace(&(self->circularBuffer), &(self->format))) == 0)
usleep(10000);
// check we didn't stop
if(runningAtStart && (!self->running))
return noErr;
bufferList = TPCircularBufferPrepareEmptyAudioBufferListWithAudioFormat(&(self->circularBuffer), &(self->format), available, NULL);
// we are writing mono/interleaved data so we have one buffer
UInt32 bytesToWrite = min(bytes, bufferList->mBuffers[0].mDataByteSize);
bufferList->mBuffers[0].mNumberChannels = (self->format).mChannelsPerFrame;
bufferList->mBuffers[0].mDataByteSize = bytesToWrite;
memcpy(bufferList->mBuffers[0].mData, dataPtr, bytesToWrite);
TPCircularBufferProduceAudioBufferList(&(self->circularBuffer), NULL);
dataPtr += bytesToWrite;
bytes -= bytesToWrite;
if(! runningAtStart) {
OSStatus err = AudioOutputUnitStart(self->outputUnit);
if(err == noErr) {
self->running = TRUE;
runningAtStart = TRUE;
} else {
return err;
}
}
}
return noErr;
}
bool TPCircularBufferCopyAudioBufferList(TPCircularBuffer *buffer, const AudioBufferList *inBufferList, const AudioTimeStamp *inTimestamp, UInt32 frames, AudioStreamBasicDescription *audioDescription) {
int byteCount = inBufferList->mBuffers[0].mDataByteSize;
if ( frames != kTPCircularBufferCopyAll ) {
byteCount = frames * audioDescription->mBytesPerFrame;
assert(byteCount <= inBufferList->mBuffers[0].mDataByteSize);
}
AudioBufferList *bufferList = TPCircularBufferPrepareEmptyAudioBufferList(buffer, inBufferList->mNumberBuffers, byteCount, inTimestamp);
if ( !bufferList ) return false;
for ( int i=0; i<bufferList->mNumberBuffers; i++ ) {
memcpy(bufferList->mBuffers[i].mData, inBufferList->mBuffers[i].mData, byteCount);
}
TPCircularBufferProduceAudioBufferList(buffer, NULL);
return true;
}
