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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 #if ENABLE(WEB_AUDIO)
     27 #include "modules/webaudio/MediaStreamAudioDestinationNode.h"
     28 
     29 #include "modules/webaudio/AudioContext.h"
     30 #include "modules/webaudio/AudioNodeInput.h"
     31 #include "platform/UUID.h"
     32 #include "platform/mediastream/MediaStreamCenter.h"
     33 #include "public/platform/WebRTCPeerConnectionHandler.h"
     34 #include "wtf/Locker.h"
     35 
     36 namespace blink {
     37 
     38 MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AudioContext* context, size_t numberOfChannels)
     39 {
     40     return adoptRefCountedGarbageCollectedWillBeNoop(new MediaStreamAudioDestinationNode(context, numberOfChannels));
     41 }
     42 
     43 MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* context, size_t numberOfChannels)
     44     : AudioBasicInspectorNode(context, context->sampleRate(), numberOfChannels)
     45     , m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
     46 {
     47     setNodeType(NodeTypeMediaStreamAudioDestination);
     48 
     49     m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", MediaStreamSource::ReadyStateLive, true);
     50     MediaStreamSourceVector audioSources;
     51     audioSources.append(m_source);
     52     MediaStreamSourceVector videoSources;
     53     m_stream = MediaStream::create(context->executionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
     54     MediaStreamCenter::instance().didCreateMediaStreamAndTracks(m_stream->descriptor());
     55 
     56     m_source->setAudioFormat(numberOfChannels, context->sampleRate());
     57 
     58     initialize();
     59 }
     60 
     61 MediaStreamAudioDestinationNode::~MediaStreamAudioDestinationNode()
     62 {
     63     ASSERT(!isInitialized());
     64 }
     65 
     66 void MediaStreamAudioDestinationNode::dispose()
     67 {
     68     uninitialize();
     69     AudioBasicInspectorNode::dispose();
     70 }
     71 
     72 void MediaStreamAudioDestinationNode::trace(Visitor* visitor)
     73 {
     74     visitor->trace(m_stream);
     75     AudioBasicInspectorNode::trace(visitor);
     76 }
     77 
     78 void MediaStreamAudioDestinationNode::process(size_t numberOfFrames)
     79 {
     80     m_mixBus->copyFrom(*input(0)->bus());
     81     m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
     82 }
     83 
     84 } // namespace blink
     85 
     86 #endif // ENABLE(WEB_AUDIO)
     87