root/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp

DEFINITIONS

1. create
2. m_mixBus
3. process

/*
 * 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
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#include "config.h"

#if ENABLE(WEB_AUDIO)

#include "modules/webaudio/MediaStreamAudioDestinationNode.h"

#include "modules/webaudio/AudioContext.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "platform/UUID.h"
#include "platform/mediastream/MediaStreamCenter.h"
#include "public/platform/WebRTCPeerConnectionHandler.h"
#include "wtf/Locker.h"

namespace WebCore {

PassRefPtr<MediaStreamAudioDestinationNode> MediaStreamAudioDestinationNode::create(AudioContext* context, size_t numberOfChannels)
{
    return adoptRef(new MediaStreamAudioDestinationNode(context, numberOfChannels));
}

MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* context, size_t numberOfChannels)
    : AudioBasicInspectorNode(context, context->sampleRate(), numberOfChannels)
    , m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
{
    ScriptWrappable::init(this);
    setNodeType(NodeTypeMediaStreamAudioDestination);

    m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", MediaStreamSource::ReadyStateLive, true);
    MediaStreamSourceVector audioSources;
    audioSources.append(m_source);
    MediaStreamSourceVector videoSources;
    m_stream = MediaStream::create(context->executionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
    MediaStreamCenter::instance().didCreateMediaStreamAndTracks(m_stream->descriptor());

    m_source->setAudioFormat(numberOfChannels, context->sampleRate());

    initialize();
}

MediaStreamAudioDestinationNode::~MediaStreamAudioDestinationNode()
{
    uninitialize();
}

void MediaStreamAudioDestinationNode::process(size_t numberOfFrames)
{
    m_mixBus->copyFrom(*input(0)->bus());
    m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)