/*
 * 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;
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 */

#ifndef MultiChannelResampler_h
#define MultiChannelResampler_h

#include "SincResampler.h"
#include <memory>
#include <wtf/Vector.h>

namespace WebCore {

class AudioBus;

class MultiChannelResampler final {
    WTF_MAKE_FAST_ALLOCATED;
public:   
    explicit MultiChannelResampler(double scaleFactor, unsigned numberOfChannels);
    ~MultiChannelResampler();

    // Process given AudioSourceProvider for streaming applications.
    void process(AudioSourceProvider*, AudioBus* destination, size_t framesToProcess);

private:
    // 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;

    class ChannelProvider;
    std::unique_ptr<ChannelProvider> m_channelProvider;
};

} // namespace WebCore

#endif // MultiChannelResampler_h