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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 #ifndef MediaStreamAudioSourceNode_h
     26 #define MediaStreamAudioSourceNode_h
     27 
     28 #if ENABLE(WEB_AUDIO)
     29 
     30 #include "platform/audio/AudioSourceProvider.h"
     31 #include "platform/audio/AudioSourceProviderClient.h"
     32 #include "modules/mediastream/MediaStream.h"
     33 #include "modules/webaudio/AudioSourceNode.h"
     34 #include "wtf/OwnPtr.h"
     35 #include "wtf/PassRefPtr.h"
     36 #include "wtf/Threading.h"
     37 
     38 namespace blink {
     39 
     40 class AudioContext;
     41 
     42 class MediaStreamAudioSourceNode FINAL : public AudioSourceNode, public AudioSourceProviderClient {
     43     DEFINE_WRAPPERTYPEINFO();
     44     USING_GARBAGE_COLLECTED_MIXIN(MediaStreamAudioSourceNode);
     45 public:
     46     static MediaStreamAudioSourceNode* create(AudioContext*, MediaStream*, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
     47 
     48     virtual ~MediaStreamAudioSourceNode();
     49 
     50     MediaStream* mediaStream() { return m_mediaStream.get(); }
     51 
     52     // AudioNode
     53     virtual void dispose() OVERRIDE;
     54     virtual void process(size_t framesToProcess) OVERRIDE;
     55 
     56     // AudioSourceProviderClient
     57     virtual void setFormat(size_t numberOfChannels, float sampleRate) OVERRIDE;
     58 
     59     AudioSourceProvider* audioSourceProvider() const { return m_audioSourceProvider.get(); }
     60 
     61     virtual void trace(Visitor*) OVERRIDE;
     62 
     63 private:
     64     MediaStreamAudioSourceNode(AudioContext*, MediaStream*, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
     65 
     66     // As an audio source, we will never propagate silence.
     67     virtual bool propagatesSilence() const OVERRIDE { return false; }
     68 
     69     Member<MediaStream> m_mediaStream;
     70     Member<MediaStreamTrack> m_audioTrack;
     71     OwnPtr<AudioSourceProvider> m_audioSourceProvider;
     72 
     73     Mutex m_processLock;
     74 
     75     unsigned m_sourceNumberOfChannels;
     76 };
     77 
     78 } // namespace blink
     79 
     80 #endif // ENABLE(WEB_AUDIO)
     81 
     82 #endif // MediaStreamAudioSourceNode_h
     83