//==============================================================================
bool readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
int64 startSampleInFile, int numSamples) override
{
clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
startSampleInFile, numSamples, lengthInSamples);
if (numSamples <= 0)
return true;
if (lastReadPosition != startSampleInFile)
{
OSStatus status = ExtAudioFileSeek (audioFileRef, startSampleInFile);
if (status != noErr)
return false;
lastReadPosition = startSampleInFile;
}
while (numSamples > 0)
{
const int numThisTime = jmin (8192, numSamples);
const size_t numBytes = sizeof (float) * (size_t) numThisTime;
audioDataBlock.ensureSize (numBytes * numChannels, false);
float* data = static_cast<float*> (audioDataBlock.getData());
for (int j = (int) numChannels; --j >= 0;)
{
bufferList->mBuffers[j].mNumberChannels = 1;
bufferList->mBuffers[j].mDataByteSize = (UInt32) numBytes;
bufferList->mBuffers[j].mData = data;
data += numThisTime;
}
UInt32 numFramesToRead = (UInt32) numThisTime;
OSStatus status = ExtAudioFileRead (audioFileRef, &numFramesToRead, bufferList);
if (status != noErr)
return false;
for (int i = numDestChannels; --i >= 0;)
{
if (destSamples[i] != nullptr)
{
if (i < (int) numChannels)
memcpy (destSamples[i] + startOffsetInDestBuffer, bufferList->mBuffers[i].mData, numBytes);
else
zeromem (destSamples[i] + startOffsetInDestBuffer, numBytes);
}
}
startOffsetInDestBuffer += numThisTime;
numSamples -= numThisTime;
lastReadPosition += numThisTime;
}
return true;
}
//==============================================================================
bool AudioSubsectionReader::readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
int64 startSampleInFile, int numSamples)
{
clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
startSampleInFile, numSamples, length);
return source->readSamples (destSamples, numDestChannels, startOffsetInDestBuffer,
startSampleInFile + startSample, numSamples);
}
bool BufferingAudioReader::readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
int64 startSampleInFile, int numSamples)
{
const uint32 startTime = Time::getMillisecondCounter();
clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
startSampleInFile, numSamples, lengthInSamples);
const ScopedLock sl (lock);
nextReadPosition = startSampleInFile;
while (numSamples > 0)
{
if (const BufferedBlock* const block = getBlockContaining (startSampleInFile))
{
const int offset = (int) (startSampleInFile - block->range.getStart());
const int numToDo = jmin (numSamples, (int) (block->range.getEnd() - startSampleInFile));
for (int j = 0; j < numDestChannels; ++j)
{
if (float* dest = (float*) destSamples[j])
{
dest += startOffsetInDestBuffer;
if (j < (int) numChannels)
FloatVectorOperations::copy (dest, block->buffer.getReadPointer (j, offset), numToDo);
else
FloatVectorOperations::clear (dest, numToDo);
}
}
startOffsetInDestBuffer += numToDo;
startSampleInFile += numToDo;
numSamples -= numToDo;
}
else
{
if (timeoutMs >= 0 && Time::getMillisecondCounter() >= startTime + (uint32) timeoutMs)
{
for (int j = 0; j < numDestChannels; ++j)
if (float* dest = (float*) destSamples[j])
FloatVectorOperations::clear (dest + startOffsetInDestBuffer, numSamples);
break;
}
else
{
ScopedUnlock ul (lock);
Thread::yield();
}
}
}
return true;
}
