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#ifndef ReverbConvolver_h
#define ReverbConvolver_h
#include "platform/audio/AudioArray.h"
#include "platform/audio/DirectConvolver.h"
#include "platform/audio/FFTConvolver.h"
#include "platform/audio/ReverbAccumulationBuffer.h"
#include "platform/audio/ReverbConvolverStage.h"
#include "platform/audio/ReverbInputBuffer.h"
#include "wtf/OwnPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"
namespace blink {
class WebThread;
}
namespace WebCore {
class AudioChannel;
class PLATFORM_EXPORT ReverbConvolver {
WTF_MAKE_NONCOPYABLE(ReverbConvolver);
public:
// maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much precision is necessary.
// For certain tweaky de-convolving applications the phase errors add up quickly and lead to non-sensical results with
// larger FFT sizes and single-precision floats. In these cases 2048 is a good size.
// If not doing multi-threaded convolution, then should not go > 8192.
ReverbConvolver(AudioChannel* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool useBackgroundThreads);
~ReverbConvolver();
void process(const AudioChannel* sourceChannel, AudioChannel* destinationChannel, size_t framesToProcess);
void reset();
ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
size_t latencyFrames() const;
private:
void processInBackground();
Vector<OwnPtr<ReverbConvolverStage> > m_stages;
Vector<OwnPtr<ReverbConvolverStage> > m_backgroundStages;
size_t m_impulseResponseLength;
ReverbAccumulationBuffer m_accumulationBuffer;
// One or more background threads read from this input buffer which is fed from the realtime thread.
ReverbInputBuffer m_inputBuffer;
// First stage will be of size m_minFFTSize. Each next stage will be twice as big until we hit m_maxFFTSize.
size_t m_minFFTSize;
size_t m_maxFFTSize;
// But don't exceed this size in the real-time thread (if we're doing background processing).
size_t m_maxRealtimeFFTSize;
// Background thread and synchronization
OwnPtr<blink::WebThread> m_backgroundThread;
};
} // namespace WebCore
#endif // ReverbConvolver_h