V8AudioContextCustom.cpp   [plain text]

/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *    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
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "V8AudioContext.h"

#include <wtf/ArrayBuffer.h>
#include "AudioBuffer.h"
#include "AudioContext.h"
#include "Frame.h"
#include "V8ArrayBuffer.h"
#include "V8AudioBuffer.h"
#include "V8Binding.h"
#include "V8Proxy.h"

namespace WebCore {

v8::Handle<v8::Value> V8AudioContext::constructorCallback(const v8::Arguments& args)
{
    INC_STATS("DOM.AudioContext.Contructor");

    if (!args.IsConstructCall())
        return throwError("AudioContext constructor cannot be called as a function.", V8Proxy::TypeError);

    if (ConstructorMode::current() == ConstructorMode::WrapExistingObject)
        return args.Holder();

    Frame* frame = V8Proxy::retrieveFrameForCurrentContext();
    if (!frame)
        return throwError("AudioContext constructor associated frame is unavailable", V8Proxy::ReferenceError);

    Document* document = frame->document();
    if (!document)
        return throwError("AudioContext constructor associated document is unavailable", V8Proxy::ReferenceError);

    RefPtr<AudioContext> audioContext;
    
    if (!args.Length()) {
        // Constructor for default AudioContext which talks to audio hardware.
        ExceptionCode ec = 0;
        audioContext = AudioContext::create(document, ec);
        if (ec)
            return throwError(ec);
        if (!audioContext.get())
            return throwError("audio resources unavailable for AudioContext construction", V8Proxy::SyntaxError);
    } else {
        // Constructor for offline (render-target) AudioContext which renders into an AudioBuffer.
        // new AudioContext(in unsigned long numberOfChannels, in unsigned long numberOfFrames, in float sampleRate);
        if (args.Length() < 3)
            return V8Proxy::throwNotEnoughArgumentsError();

        bool ok = false;

        int32_t numberOfChannels = toInt32(args[0], ok);
        if (!ok || numberOfChannels <= 0 || numberOfChannels > 10)
            return throwError("Invalid number of channels", V8Proxy::SyntaxError);

        int32_t numberOfFrames = toInt32(args[1], ok);
        if (!ok || numberOfFrames <= 0)
            return throwError("Invalid number of frames", V8Proxy::SyntaxError);

        float sampleRate = toFloat(args[2]);
        if (sampleRate <= 0)
            return throwError("Invalid sample rate", V8Proxy::SyntaxError);

        ExceptionCode ec = 0;
        audioContext = AudioContext::createOfflineContext(document, numberOfChannels, numberOfFrames, sampleRate, ec);
        if (ec)
            return throwError(ec);
    }

    if (!audioContext.get())
        return throwError("Error creating AudioContext", V8Proxy::SyntaxError);
    
    // Transform the holder into a wrapper object for the audio context.
    V8DOMWrapper::setDOMWrapper(args.Holder(), &info, audioContext.get());
    audioContext->ref();
    
    return args.Holder();
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)