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 "core/html/HTMLMediaElement.h" 31 #include "core/platform/audio/AudioSourceProviderClient.h" 32 #include "core/platform/audio/MultiChannelResampler.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 MediaElementAudioSourceNode : public AudioSourceNode, public AudioSourceProviderClient { 43 public: 44 static PassRefPtr<MediaElementAudioSourceNode> create(AudioContext*, HTMLMediaElement*); 45 46 virtual ~MediaElementAudioSourceNode(); 47 48 HTMLMediaElement* mediaElement() { return m_mediaElement.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 void lock(); 58 void unlock(); 59 60 private: 61 MediaElementAudioSourceNode(AudioContext*, HTMLMediaElement*); 62 63 // As an audio source, we will never propagate silence. 64 virtual bool propagatesSilence() const OVERRIDE { return false; } 65 66 RefPtr<HTMLMediaElement> m_mediaElement; 67 Mutex m_processLock; 68 69 unsigned m_sourceNumberOfChannels; 70 double m_sourceSampleRate; 71 72 OwnPtr<MultiChannelResampler> m_multiChannelResampler; 73 }; 74 75 } // namespace WebCore 76 77 #endif // ENABLE(WEB_AUDIO) 78 79 #endif // MediaElementAudioSourceNode_h 80
