Source/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
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    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
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "modules/webaudio/OfflineAudioContext.h"

#include "bindings/v8/ExceptionMessages.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/Document.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/ExecutionContext.h"

namespace WebCore {

PassRefPtr<OfflineAudioContext> OfflineAudioContext::create(ExecutionContext* context, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& es)
{
    // FIXME: add support for workers.
    if (!context || !context->isDocument()) {
        es.throwDOMException(
            NotSupportedError,
            ExceptionMessages::failedToConstruct("OfflineAudioContext"));
        return 0;
    }

    Document* document = toDocument(context);

    if (!numberOfFrames) {
        es.throwDOMException(
            SyntaxError,
            ExceptionMessages::failedToConstruct(
                "OfflineAudioContext",
                "number of frames cannot be zero."));
        return 0;
    }

    if (numberOfChannels > 10) {
        es.throwDOMException(
            SyntaxError,
            ExceptionMessages::failedToConstruct(
                "OfflineAudioContext",
                "number of channels (" + String::number(numberOfChannels) + ") exceeds maximum (10)."));
        return 0;
    }

    if (!isSampleRateRangeGood(sampleRate)) {
        es.throwDOMException(
            SyntaxError,
            ExceptionMessages::failedToConstruct(
                "OfflineAudioContext",
                "sample rate (" + String::number(sampleRate) + ") must be in the range 44100-96000 Hz."));
        return 0;
    }

    RefPtr<OfflineAudioContext> audioContext(adoptRef(new OfflineAudioContext(document, numberOfChannels, numberOfFrames, sampleRate)));
    audioContext->suspendIfNeeded();
    return audioContext.release();
}

OfflineAudioContext::OfflineAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
    : AudioContext(document, numberOfChannels, numberOfFrames, sampleRate)
{
    ScriptWrappable::init(this);
}

OfflineAudioContext::~OfflineAudioContext()
{
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)