Home | History | Annotate | Download | only in webaudio 
      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 "core/platform/audio/AudioSourceProvider.h"
     31 #include "core/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 WebCore {
     39 
     40 class AudioContext;
     41 
     42 class MediaStreamAudioSourceNode : public AudioSourceNode, public AudioSourceProviderClient {
     43 public:
     44     static PassRefPtr<MediaStreamAudioSourceNode> create(AudioContext*, MediaStream*, AudioSourceProvider*);
     45 
     46     virtual ~MediaStreamAudioSourceNode();
     47 
     48     MediaStream* mediaStream() { return m_mediaStream.get(); }
     49 
     50     // AudioNode
     51     virtual void process(size_t framesToProcess);
     52     virtual void reset();
     53 
     54     // AudioSourceProviderClient
     55     virtual void setFormat(size_t numberOfChannels, float sampleRate);
     56 
     57     AudioSourceProvider* audioSourceProvider() const { return m_audioSourceProvider; }
     58 
     59 private:
     60     MediaStreamAudioSourceNode(AudioContext*, MediaStream*, AudioSourceProvider*);
     61 
     62     // As an audio source, we will never propagate silence.
     63     virtual bool propagatesSilence() const OVERRIDE { return false; }
     64 
     65     RefPtr<MediaStream> m_mediaStream;
     66     AudioSourceProvider* m_audioSourceProvider;
     67 
     68     Mutex m_processLock;
     69 
     70     unsigned m_sourceNumberOfChannels;
     71 };
     72 
     73 } // namespace WebCore
     74 
     75 #endif // ENABLE(WEB_AUDIO)
     76 
     77 #endif // MediaStreamAudioSourceNode_h
     78