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 WebCore { 39 40 class AudioContext; 41 42 class MediaStreamAudioSourceNode FINAL : public AudioSourceNode, public AudioSourceProviderClient { 43 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaStreamAudioSourceNode); 44 public: 45 static PassRefPtrWillBeRawPtr<MediaStreamAudioSourceNode> create(AudioContext*, MediaStream*, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>); 46 47 virtual ~MediaStreamAudioSourceNode(); 48 mediaStream()49 MediaStream* mediaStream() { return m_mediaStream.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 audioSourceProvider()57 AudioSourceProvider* audioSourceProvider() const { return m_audioSourceProvider.get(); } 58 59 virtual void trace(Visitor*) OVERRIDE; 60 61 private: 62 MediaStreamAudioSourceNode(AudioContext*, MediaStream*, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>); 63 64 // As an audio source, we will never propagate silence. propagatesSilence()65 virtual bool propagatesSilence() const OVERRIDE { return false; } 66 67 RefPtrWillBeMember<MediaStream> m_mediaStream; 68 RefPtrWillBeMember<MediaStreamTrack> m_audioTrack; 69 OwnPtr<AudioSourceProvider> m_audioSourceProvider; 70 71 Mutex m_processLock; 72 73 unsigned m_sourceNumberOfChannels; 74 }; 75 76 } // namespace WebCore 77 78 #endif // ENABLE(WEB_AUDIO) 79 80 #endif // MediaStreamAudioSourceNode_h 81