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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#ifndef ReverbConvolver_h
#define ReverbConvolver_h
#include "ReverbAccumulationBuffer.h"
#include "ReverbConvolverStage.h"
#include "ReverbInputBuffer.h"
#include <memory>
#include <wtf/Condition.h>
#include <wtf/Lock.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
namespace WebCore {
class AudioChannel;
class ReverbConvolver final {
WTF_MAKE_FAST_ALLOCATED;
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, float scale);
~ReverbConvolver();
void process(const AudioChannel* sourceChannel, AudioChannel* destinationChannel, size_t framesToProcess);
void reset();
size_t impulseResponseLength() const { return m_impulseResponseLength; }
ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
bool useBackgroundThreads() const { return m_useBackgroundThreads; }
size_t latencyFrames() const;
private:
void backgroundThreadEntry();
Vector<std::unique_ptr<ReverbConvolverStage>> m_stages;
Vector<std::unique_ptr<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
bool m_useBackgroundThreads;
RefPtr<Thread> m_backgroundThread;
bool m_wantsToExit { false };
bool m_moreInputBuffered { false };
mutable Lock m_backgroundThreadLock;
mutable Condition m_backgroundThreadConditionVariable;
};
} // namespace WebCore
#endif // ReverbConvolver_h