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 WebCore { 38 39 class AudioContext; 40 class HTMLMediaElement; 41 42 class MediaElementAudioSourceNode FINAL : public AudioSourceNode, public AudioSourceProviderClient { 43 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaElementAudioSourceNode); 44 public: 45 static PassRefPtrWillBeRawPtr<MediaElementAudioSourceNode> create(AudioContext*, HTMLMediaElement*); 46 47 virtual ~MediaElementAudioSourceNode(); 48 49 HTMLMediaElement* mediaElement() { return m_mediaElement.get(); } 50 51 // AudioNode 52 virtual void process(size_t framesToProcess) OVERRIDE; 53 54 // AudioSourceProviderClient 55 virtual void setFormat(size_t numberOfChannels, float sampleRate) OVERRIDE; 56 57 virtual void lock() OVERRIDE; 58 virtual void unlock() OVERRIDE; 59 60 virtual void trace(Visitor*) OVERRIDE; 61 62 private: 63 MediaElementAudioSourceNode(AudioContext*, HTMLMediaElement*); 64 65 // As an audio source, we will never propagate silence. 66 virtual bool propagatesSilence() const OVERRIDE { return false; } 67 68 RefPtrWillBeMember<HTMLMediaElement> m_mediaElement; 69 Mutex m_processLock; 70 71 unsigned m_sourceNumberOfChannels; 72 double m_sourceSampleRate; 73 74 OwnPtr<MultiChannelResampler> m_multiChannelResampler; 75 }; 76 77 } // namespace WebCore 78 79 #endif // ENABLE(WEB_AUDIO) 80 81 #endif // MediaElementAudioSourceNode_h 82