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      1 /*
      2  * Copyright (C) 2012, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/MediaStreamAudioDestinationNode.h"
     30 
     31 #include "core/platform/UUID.h"
     32 #include "core/platform/mediastream/MediaStreamCenter.h"
     33 #include "core/platform/mediastream/RTCPeerConnectionHandler.h"
     34 #include "modules/mediastream/MediaStream.h"
     35 #include "modules/webaudio/AudioContext.h"
     36 #include "modules/webaudio/AudioNodeInput.h"
     37 #include "wtf/Locker.h"
     38 
     39 namespace WebCore {
     40 
     41 PassRefPtr<MediaStreamAudioDestinationNode> MediaStreamAudioDestinationNode::create(AudioContext* context, size_t numberOfChannels)
     42 {
     43     return adoptRef(new MediaStreamAudioDestinationNode(context, numberOfChannels));
     44 }
     45 
     46 MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* context, size_t numberOfChannels)
     47     : AudioBasicInspectorNode(context, context->sampleRate(), numberOfChannels)
     48     , m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
     49 {
     50     ScriptWrappable::init(this);
     51     setNodeType(NodeTypeMediaStreamAudioDestination);
     52 
     53     m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", MediaStreamSource::ReadyStateLive, true);
     54     MediaStreamSourceVector audioSources;
     55     audioSources.append(m_source);
     56     MediaStreamSourceVector videoSources;
     57     m_stream = MediaStream::create(context->scriptExecutionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
     58     MediaStreamCenter::instance().didCreateMediaStream(m_stream->descriptor());
     59 
     60     m_source->setAudioFormat(numberOfChannels, context->sampleRate());
     61 
     62     initialize();
     63 }
     64 
     65 MediaStreamSource* MediaStreamAudioDestinationNode::mediaStreamSource()
     66 {
     67     return m_source.get();
     68 }
     69 
     70 MediaStreamAudioDestinationNode::~MediaStreamAudioDestinationNode()
     71 {
     72     uninitialize();
     73 }
     74 
     75 void MediaStreamAudioDestinationNode::process(size_t numberOfFrames)
     76 {
     77     m_mixBus->copyFrom(*input(0)->bus());
     78     m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
     79 }
     80 
     81 void MediaStreamAudioDestinationNode::reset()
     82 {
     83 }
     84 
     85 } // namespace WebCore
     86 
     87 #endif // ENABLE(WEB_AUDIO)
     88