Int64 DShowAudioSource::readFrames(float* data, UInt32 numChannels, UInt32 numFrames)
{
memset(data, 0, sizeof(float) * numChannels * numFrames);
// Check if we are done decoding...
long evCode;
mpMediaControl->Run();
HRESULT hr = mpMediaEvent->WaitForCompletion(0, &evCode);
if(evCode == EC_COMPLETE)
{
mEOF = true;
}
RScopedLock l(&mLock);
Int64 framesRead = numFrames;
if(mBuffer.size() > 0)
{
if(mBuffer.size() / mpWaveFormatEx->nChannels < framesRead)
{
framesRead = mBuffer.size() / mpWaveFormatEx->nChannels;
}
for(UInt32 j = 0; j < numChannels; ++j)
{
float *in = NULL;
if(mpWaveFormatEx->nChannels == 1)
in = &mBuffer[0];
else
in = &mBuffer[j];
for(UInt32 i = 0; i < framesRead; ++i)
{
*(data++) = *in;
in += mpWaveFormatEx->nChannels;
}
}
mBuffer.erase(mBuffer.begin(), mBuffer.begin()+(framesRead * mpWaveFormatEx->nChannels));
}
mCurrentPosition += framesRead;
// Check if we need to decode more data
if(mBuffer.size() < numFrames * mpWaveFormatEx->nChannels * 2)
{
if(mEOF && isLooping())
{
setDecoderPosition(0);
}
}
if(mEOF && framesRead == 0)
{
return -1;
}
return framesRead;
}
void DShowAudioSource::setPosition(double position)
{
setDecoderPosition(position);
RScopedLock l(&mLock);
mBuffer.clear();
mCurrentPosition = (Int64)(position * getSampleRate());
mpMediaControl->Run();
}
void BufferedAudioSource::setPosition(double seconds)
{
seconds = seconds < 0 ? 0.0f : seconds;
seconds = seconds > getLength() ? getLength() : seconds;
RScopedLock l(&mLock);
Int64 frames = (Int64)(seconds * getSampleRate());
if(!isLoadedInMemory())
{
mBuffer.clear();
setDecoderPosition(frames);
BufferedAudioSourceThread::getInstance()->readMore();
}
}
