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      1 /*
      2  * Copyright (C) 2011, 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 MediaElementAudioSourceNode_h
     26 #define MediaElementAudioSourceNode_h
     27 
     28 #if ENABLE(WEB_AUDIO)
     29 
     30 #include "platform/audio/AudioSourceProviderClient.h"
     31 #include "platform/audio/MultiChannelResampler.h"
     32 #include "modules/webaudio/AudioSourceNode.h"
     33 #include "wtf/OwnPtr.h"
     34 #include "wtf/PassRefPtr.h"
     35 #include "wtf/ThreadingPrimitives.h"
     36 
     37 namespace blink {
     38 
     39 class AudioContext;
     40 class HTMLMediaElement;
     41 
     42 class MediaElementAudioSourceNode FINAL : public AudioSourceNode, public AudioSourceProviderClient {
     43     DEFINE_WRAPPERTYPEINFO();
     44     USING_GARBAGE_COLLECTED_MIXIN(MediaElementAudioSourceNode);
     45 public:
     46     static MediaElementAudioSourceNode* create(AudioContext*, HTMLMediaElement*);
     47 
     48     virtual ~MediaElementAudioSourceNode();
     49 
     50     HTMLMediaElement* mediaElement() { return m_mediaElement.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     virtual void lock() OVERRIDE;
     60     virtual void unlock() OVERRIDE;
     61 
     62     virtual void trace(Visitor*) OVERRIDE;
     63 
     64 private:
     65     MediaElementAudioSourceNode(AudioContext*, HTMLMediaElement*);
     66 
     67     // As an audio source, we will never propagate silence.
     68     virtual bool propagatesSilence() const OVERRIDE { return false; }
     69 
     70     RefPtrWillBeMember<HTMLMediaElement> m_mediaElement;
     71     Mutex m_processLock;
     72 
     73     unsigned m_sourceNumberOfChannels;
     74     double m_sourceSampleRate;
     75 
     76     OwnPtr<MultiChannelResampler> m_multiChannelResampler;
     77 };
     78 
     79 } // namespace blink
     80 
     81 #endif // ENABLE(WEB_AUDIO)
     82 
     83 #endif // MediaElementAudioSourceNode_h
     84