Source/WebCore/Modules/webaudio/OfflineAudioContext.cpp

/*
 * Copyright (C) 2012, 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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 *    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
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "OfflineAudioContext.h"

#include "AudioBuffer.h"
#include "Document.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(OfflineAudioContext);

inline OfflineAudioContext::OfflineAudioContext(Document& document, AudioBuffer* renderTarget)
    : AudioContext(document, renderTarget)
{
}

ExceptionOr<Ref<OfflineAudioContext>> OfflineAudioContext::create(ScriptExecutionContext& context, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
{
    // FIXME: Add support for workers.
    if (!is<Document>(context))
        return Exception { NotSupportedError };
    if (!numberOfChannels || numberOfChannels > 10 || !numberOfFrames || !isSampleRateRangeGood(sampleRate))
        return Exception { SyntaxError };
    auto renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
    if (!renderTarget)
        return Exception { SyntaxError };

    auto audioContext = adoptRef(*new OfflineAudioContext(downcast<Document>(context), renderTarget.get()));
    audioContext->suspendIfNeeded();
    return audioContext;
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)