void TPCircularBufferConsumeNextBufferListPartial(TPCircularBuffer *buffer, int framesToConsume, AudioStreamBasicDescription *audioFormat) {
assert(framesToConsume >= 0);
int32_t dontcare;
TPCircularBufferABLBlockHeader *block = (TPCircularBufferABLBlockHeader*)TPCircularBufferTail(buffer, &dontcare);
if ( !block ) return;
assert(!((unsigned long)block & 0xF)); // Beware unaligned accesses
int bytesToConsume = framesToConsume * audioFormat->mBytesPerFrame;
if ( bytesToConsume == block->bufferList.mBuffers[0].mDataByteSize ) {
TPCircularBufferConsumeNextBufferList(buffer);
return;
}
for ( int i=0; i<block->bufferList.mNumberBuffers; i++ ) {
assert(bytesToConsume <= block->bufferList.mBuffers[i].mDataByteSize && (char*)block->bufferList.mBuffers[i].mData + bytesToConsume <= (char*)block+block->totalLength);
block->bufferList.mBuffers[i].mData = (char*)block->bufferList.mBuffers[i].mData + bytesToConsume;
block->bufferList.mBuffers[i].mDataByteSize -= bytesToConsume;
}
if ( block->timestamp.mFlags & kAudioTimeStampSampleTimeValid ) {
block->timestamp.mSampleTime += framesToConsume;
}
if ( block->timestamp.mFlags & kAudioTimeStampHostTimeValid ) {
if ( !__secondsToHostTicks ) {
mach_timebase_info_data_t tinfo;
mach_timebase_info(&tinfo);
__secondsToHostTicks = 1.0 / (((double)tinfo.numer / tinfo.denom) * 1.0e-9);
}
block->timestamp.mHostTime += ((double)framesToConsume / audioFormat->mSampleRate) * __secondsToHostTicks;
}
}
void TPCircularBufferConsumeNextBufferListPartial(TPCircularBuffer *buffer, int framesToConsume, const AudioStreamBasicDescription *audioFormat) {
assert(framesToConsume >= 0);
int32_t dontcare;
TPCircularBufferABLBlockHeader *block = (TPCircularBufferABLBlockHeader*)TPCircularBufferTail(buffer, &dontcare);
if ( !block ) return;
assert(!((unsigned long)block & 0xF)); // Beware unaligned accesses
int bytesToConsume = (int)min(framesToConsume * audioFormat->mBytesPerFrame, block->bufferList.mBuffers[0].mDataByteSize);
if ( bytesToConsume == block->bufferList.mBuffers[0].mDataByteSize ) {
TPCircularBufferConsumeNextBufferList(buffer);
return;
}
for ( int i=0; i<block->bufferList.mNumberBuffers; i++ ) {
assert(bytesToConsume <= block->bufferList.mBuffers[i].mDataByteSize);
block->bufferList.mBuffers[i].mData = (char*)block->bufferList.mBuffers[i].mData + bytesToConsume;
block->bufferList.mBuffers[i].mDataByteSize -= bytesToConsume;
}
if ( block->timestamp.mFlags & kAudioTimeStampSampleTimeValid ) {
block->timestamp.mSampleTime += framesToConsume;
}
if ( block->timestamp.mFlags & kAudioTimeStampHostTimeValid ) {
if ( !__secondsToHostTicks ) {
mach_timebase_info_data_t tinfo;
mach_timebase_info(&tinfo);
__secondsToHostTicks = 1.0 / (((double)tinfo.numer / tinfo.denom) * 1.0e-9);
}
block->timestamp.mHostTime += ((double)framesToConsume / audioFormat->mSampleRate) * __secondsToHostTicks;
}
// Reposition block forward, just before the audio data, ensuring 16-byte alignment
TPCircularBufferABLBlockHeader *newBlock = (TPCircularBufferABLBlockHeader*)(((unsigned long)block + bytesToConsume) & ~0xFul);
memmove(newBlock, block, sizeof(TPCircularBufferABLBlockHeader) + (block->bufferList.mNumberBuffers-1)*sizeof(AudioBuffer));
int32_t bytesFreed = (int32_t)newBlock - (int32_t)block;
newBlock->totalLength -= bytesFreed;
TPCircularBufferConsume(buffer, bytesFreed);
}
void TPCircularBufferConsumeBufferListFrames(TPCircularBuffer *buffer, UInt32 *ioLengthInFrames, AudioBufferList *outputBufferList, AudioTimeStamp *outTimestamp, AudioStreamBasicDescription *audioFormat) {
// We'll advance the buffer list pointers as we add audio - save the originals to restore later
void *savedmData[2] = { outputBufferList ? outputBufferList->mBuffers[0].mData : NULL, outputBufferList && outputBufferList->mNumberBuffers == 2 ? outputBufferList->mBuffers[1].mData : NULL };
bool hasTimestamp = false;
UInt32 bytesToGo = *ioLengthInFrames * audioFormat->mBytesPerFrame;
while ( bytesToGo > 0 ) {
AudioBufferList *bufferList = TPCircularBufferNextBufferList(buffer, hasTimestamp ? outTimestamp : NULL);
hasTimestamp = true;
if ( !bufferList ) break;
UInt32 bytesToCopy = min(bytesToGo, bufferList->mBuffers[0].mDataByteSize);
if ( outputBufferList ) {
for ( int i=0; i<outputBufferList->mNumberBuffers; i++ ) {
memcpy(outputBufferList->mBuffers[i].mData, bufferList->mBuffers[i].mData, bytesToCopy);
outputBufferList->mBuffers[i].mData = (char*)outputBufferList->mBuffers[i].mData + bytesToCopy;
}
}
if ( bytesToCopy == bufferList->mBuffers[0].mDataByteSize ) {
TPCircularBufferConsumeNextBufferList(buffer);
} else {
for ( int i=0; i<bufferList->mNumberBuffers; i++ ) {
bufferList->mBuffers[i].mData = (char*)bufferList->mBuffers[i].mData + bytesToCopy;
bufferList->mBuffers[i].mDataByteSize -= bytesToCopy;
}
}
bytesToGo -= bytesToCopy;
}
*ioLengthInFrames -= bytesToGo / audioFormat->mBytesPerFrame;
// Restore buffers
if ( outputBufferList ) {
for ( int i=0; i<outputBufferList->mNumberBuffers; i++ ) {
outputBufferList->mBuffers[i].mData = savedmData[i];
outputBufferList->mBuffers[i].mDataByteSize = *ioLengthInFrames * audioFormat->mBytesPerFrame;
}
}
}
