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/*
* Copyright (C) 2010 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AudioDSPKernelProcessor_h
#define AudioDSPKernelProcessor_h
#include "platform/audio/AudioBus.h"
#include "platform/audio/AudioProcessor.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
class AudioBus;
class AudioDSPKernel;
class AudioProcessor;
// AudioDSPKernelProcessor processes one input -> one output (N channels each)
// It uses one AudioDSPKernel object per channel to do the processing, thus
// there is no cross-channel processing. Despite this limitation it turns out
// to be a very common and useful type of processor.
class PLATFORM_EXPORT AudioDSPKernelProcessor : public AudioProcessor {
public:
// numberOfChannels may be later changed if object is not yet in an
// "initialized" state
AudioDSPKernelProcessor(float sampleRate, unsigned numberOfChannels);
// Subclasses create the appropriate type of processing kernel here.
// We'll call this to create a kernel for each channel.
virtual std::unique_ptr<AudioDSPKernel> createKernel() = 0;
// AudioProcessor methods
void initialize() override;
void uninitialize() override;
void process(const AudioBus* source,
AudioBus* destination,
size_t framesToProcess) override;
void processOnlyAudioParams(size_t framesToProcess) override;
void reset() override;
void setNumberOfChannels(unsigned) override;
unsigned numberOfChannels() const override { return m_numberOfChannels; }
double tailTime() const override;
double latencyTime() const override;
protected:
Vector<std::unique_ptr<AudioDSPKernel>> m_kernels;
mutable Mutex m_processLock;
bool m_hasJustReset;
};
} // namespace blink
#endif // AudioDSPKernelProcessor_h
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