dom/media/webaudio/blink/Reverb.h
author Karl Tomlinson <karlt+@karlt.net>
Thu, 03 Sep 2015 19:01:50 +1200
changeset 261550 d2b08c513afec90c82d2ba13cd0085f46ff42f4c
parent 252629 91d6e262b662a0b4e47358665e222d3927337af9
child 271429 ed6c2d2908ac687a37e57ce3df0cf11b3ec515a1
permissions -rw-r--r--
bug 1197028 use AudioBlock for web audio processing to reuse buffers shared downstream r=padenot

/*
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#ifndef Reverb_h
#define Reverb_h

#include "ReverbConvolver.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "AudioBlock.h"
#include "mozilla/MemoryReporting.h"

namespace mozilla {
class ThreadSharedFloatArrayBufferList;
} // namespace mozilla

namespace WebCore {

// Multi-channel convolution reverb with channel matrixing - one or more ReverbConvolver objects are used internally.

class Reverb {
public:
    enum { MaxFrameSize = 256 };

    // renderSliceSize is a rendering hint, so the FFTs can be optimized to not all occur at the same time (very bad when rendering on a real-time thread).
    Reverb(mozilla::ThreadSharedFloatArrayBufferList* impulseResponseBuffer, size_t impulseResponseBufferLength, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads, bool normalize, float sampleRate);

    void process(const mozilla::AudioBlock* sourceBus, mozilla::AudioBlock* destinationBus, size_t framesToProcess);
    void reset();

    size_t impulseResponseLength() const { return m_impulseResponseLength; }
    size_t latencyFrames() const;

    size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

private:
    void initialize(const nsTArray<const float*>& impulseResponseBuffer, size_t impulseResponseBufferLength, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads);

    size_t m_impulseResponseLength;

    nsTArray<nsAutoPtr<ReverbConvolver> > m_convolvers;

    // For "True" stereo processing
    mozilla::AudioBlock m_tempBuffer;
};

} // namespace WebCore

#endif // Reverb_h