Source/modules/webaudio/MediaStreamAudioDestinationNode.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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#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "modules/webaudio/MediaStreamAudioDestinationNode.h"

#include "modules/webaudio/AbstractAudioContext.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 blink {

MediaStreamAudioDestinationHandler::MediaStreamAudioDestinationHandler(AudioNode& node, size_t numberOfChannels)
    : AudioBasicInspectorHandler(NodeTypeMediaStreamAudioDestination, node, node.context()->sampleRate(), numberOfChannels)
    , m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
{
    m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", false, true, MediaStreamSource::ReadyStateLive, true);
    MediaStreamSourceVector audioSources;
    audioSources.append(m_source);
    MediaStreamSourceVector videoSources;
    m_stream = MediaStream::create(node.context()->executionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
    MediaStreamCenter::instance().didCreateMediaStreamAndTracks(m_stream->descriptor());

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

    initialize();
}

PassRefPtr<MediaStreamAudioDestinationHandler> MediaStreamAudioDestinationHandler::create(AudioNode& node, size_t numberOfChannels)
{
    return adoptRef(new MediaStreamAudioDestinationHandler(node, numberOfChannels));
}

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

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

// ----------------------------------------------------------------

MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AbstractAudioContext& context, size_t numberOfChannels)
    : AudioBasicInspectorNode(context)
{
    setHandler(MediaStreamAudioDestinationHandler::create(*this, numberOfChannels));
}

MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AbstractAudioContext& context, size_t numberOfChannels)
{
    return new MediaStreamAudioDestinationNode(context, numberOfChannels);
}

MediaStream* MediaStreamAudioDestinationNode::stream() const
{
    return static_cast<MediaStreamAudioDestinationHandler&>(handler()).stream();
}

} // namespace blink

#endif // ENABLE(WEB_AUDIO)