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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 AudioProcessor_h
#define AudioProcessor_h
#include "platform/PlatformExport.h"
#include "wtf/Allocator.h"
namespace blink {
class AudioBus;
// AudioProcessor is an abstract base class representing an audio signal
// processing object with a single input and a single output, where the number
// of input channels equals the number of output channels. It can be used as
// one part of a complex DSP algorithm, or as the processor for a basic (one
// input - one output) AudioNode.
class PLATFORM_EXPORT AudioProcessor {
USING_FAST_MALLOC(AudioProcessor);
public:
AudioProcessor(float sampleRate, unsigned numberOfChannels)
: m_initialized(false),
m_numberOfChannels(numberOfChannels),
m_sampleRate(sampleRate) {}
virtual ~AudioProcessor();
// Full initialization can be done here instead of in the constructor.
virtual void initialize() = 0;
virtual void uninitialize() = 0;
// Processes the source to destination bus. The number of channels must match
// in source and destination.
virtual void process(const AudioBus* source,
AudioBus* destination,
size_t framesToProcess) = 0;
// Forces all AudioParams in the processor to run the timeline,
// bypassing any other processing the processor would do in
// process().
virtual void processOnlyAudioParams(size_t framesToProcess){};
// Resets filter state
virtual void reset() = 0;
virtual void setNumberOfChannels(unsigned) = 0;
virtual unsigned numberOfChannels() const = 0;
bool isInitialized() const { return m_initialized; }
float sampleRate() const { return m_sampleRate; }
virtual double tailTime() const = 0;
virtual double latencyTime() const = 0;
protected:
bool m_initialized;
unsigned m_numberOfChannels;
float m_sampleRate;
};
} // namespace blink
#endif // AudioProcessor_h
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