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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 AudioDSPKernel_h
#define AudioDSPKernel_h
#include "platform/audio/AudioDSPKernelProcessor.h"
namespace blink {
// AudioDSPKernel does the processing for one channel of an AudioDSPKernelProcessor.
class PLATFORM_EXPORT AudioDSPKernel {
public:
AudioDSPKernel(AudioDSPKernelProcessor* kernelProcessor)
: m_kernelProcessor(kernelProcessor)
, m_sampleRate(kernelProcessor->sampleRate())
{
}
AudioDSPKernel(float sampleRate)
: m_kernelProcessor(0)
, m_sampleRate(sampleRate)
{
}
virtual ~AudioDSPKernel();
// Subclasses must override process() to do the processing and reset() to reset DSP state.
virtual void process(const float* source, float* destination, size_t framesToProcess) = 0;
virtual void reset() = 0;
float sampleRate() const { return m_sampleRate; }
double nyquist() const { return 0.5 * sampleRate(); }
AudioDSPKernelProcessor* processor() { return m_kernelProcessor; }
const AudioDSPKernelProcessor* processor() const { return m_kernelProcessor; }
virtual double tailTime() const = 0;
virtual double latencyTime() const = 0;
protected:
// Oilpan: This raw pointer is safe because the AudioDSPKernelProcessor
// object is guaranteed to be kept alive while the AudioDSPKernel object
// is alive. Ideally we want to move the AudioDSPKernel hierarchy to
// the heap and use a Member<AudioDSPKernelProcessor>. However, we cannot
// do that because AudioDSPKernel can be allocated in audio threads
// (which are not registered to Oilpan).
GC_PLUGIN_IGNORE("http://crbug.com/404578")
AudioDSPKernelProcessor* m_kernelProcessor;
float m_sampleRate;
};
} // namespace blink
#endif // AudioDSPKernel_h
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