Source/platform/audio/chromium/AudioBusChromium.cpp

/*
 * 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
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 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "platform/audio/AudioFileReader.h"

#include "platform/audio/AudioBus.h"
#include "public/platform/Platform.h"
#include "public/platform/WebAudioBus.h"

namespace WebCore {

PassRefPtr<AudioBus> decodeAudioFileData(const char* data, size_t size, double sampleRate)
{
    WebKit::WebAudioBus webAudioBus;
    if (WebKit::Platform::current()->loadAudioResource(&webAudioBus, data, size, sampleRate))
        return webAudioBus.release();
    return 0;
}

PassRefPtr<AudioBus> AudioBus::loadPlatformResource(const char* name, float sampleRate)
{
    const WebKit::WebData& resource = WebKit::Platform::current()->loadResource(name);
    if (resource.isEmpty())
        return 0;

    // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
    RefPtr<AudioBus> audioBus = decodeAudioFileData(resource.data(), resource.size(), sampleRate);

    if (!audioBus.get())
        return 0;

    // If the bus is already at the requested sample-rate then return as is.
    if (audioBus->sampleRate() == sampleRate)
        return audioBus;

    return AudioBus::createBySampleRateConverting(audioBus.get(), false, sampleRate);
}

PassRefPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
{
    // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
    RefPtr<AudioBus> audioBus = decodeAudioFileData(static_cast<const char*>(data), dataSize, sampleRate);
    if (!audioBus.get())
        return 0;

    // If the bus needs no conversion then return as is.
    if ((!mixToMono || audioBus->numberOfChannels() == 1) && audioBus->sampleRate() == sampleRate)
        return audioBus;

    return AudioBus::createBySampleRateConverting(audioBus.get(), mixToMono, sampleRate);
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)