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/*
* Copyright (C) 2011 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:
*
* 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
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS 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 MultiChannelResampler_h
#define MultiChannelResampler_h
#include <memory>
#include <wtf/Function.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace WebCore {
class AudioBus;
class SincResampler;
class MultiChannelResampler final {
WTF_MAKE_TZONE_ALLOCATED(MultiChannelResampler);
public:
// requestFrames constrols the size of the buffer in frames when provideInput is called.
MultiChannelResampler(double scaleFactor, unsigned numberOfChannels, unsigned requestFrames, Function<void(AudioBus*, size_t framesToProcess)>&& provideInput);
~MultiChannelResampler();
void process(AudioBus* destination, size_t framesToProcess);
private:
void provideInputForChannel(std::span<float> buffer, size_t framesToProcess, unsigned channelIndex);
// FIXME: the mac port can have a more highly optimized implementation based on CoreAudio
// instead of SincResampler. For now the default implementation will be used on all ports.
// https://bugs.webkit.org/show_bug.cgi?id=75118
// Each channel will be resampled using a high-quality SincResampler.
Vector<std::unique_ptr<SincResampler>> m_kernels;
unsigned m_numberOfChannels;
size_t m_outputFramesReady { 0 };
Function<void(AudioBus*, size_t framesToProcess)> m_provideInput;
RefPtr<AudioBus> m_multiChannelBus;
};
} // namespace WebCore
#endif // MultiChannelResampler_h
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