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 OfflineAudioDestinationNode_h 26 #define OfflineAudioDestinationNode_h 27 28 #include "modules/webaudio/AudioBuffer.h" 29 #include "modules/webaudio/AudioDestinationNode.h" 30 #include "public/platform/WebThread.h" 31 #include "wtf/PassRefPtr.h" 32 #include "wtf/RefPtr.h" 33 34 namespace WebCore { 35 36 class AudioBus; 37 class AudioContext; 38 39 class OfflineAudioDestinationNode : public AudioDestinationNode { 40 public: create(AudioContext * context,AudioBuffer * renderTarget)41 static PassRefPtr<OfflineAudioDestinationNode> create(AudioContext* context, AudioBuffer* renderTarget) 42 { 43 return adoptRef(new OfflineAudioDestinationNode(context, renderTarget)); 44 } 45 46 virtual ~OfflineAudioDestinationNode(); 47 48 // AudioNode 49 virtual void initialize() OVERRIDE; 50 virtual void uninitialize() OVERRIDE; 51 52 // AudioDestinationNode enableInput(const String &)53 virtual void enableInput(const String&) OVERRIDE { } 54 virtual void startRendering() OVERRIDE; 55 sampleRate()56 virtual float sampleRate() const { return m_renderTarget->sampleRate(); } 57 58 private: 59 class OfflineRenderingTask; 60 friend class OfflineRenderingTask; 61 62 OfflineAudioDestinationNode(AudioContext*, AudioBuffer* renderTarget); 63 64 // This AudioNode renders into this AudioBuffer. 65 RefPtr<AudioBuffer> m_renderTarget; 66 67 // Temporary AudioBus for each render quantum. 68 RefPtr<AudioBus> m_renderBus; 69 70 // Rendering thread. 71 OwnPtr<blink::WebThread> m_renderThread; 72 bool m_startedRendering; 73 void offlineRender(); 74 75 // For completion callback on main thread. 76 static void notifyCompleteDispatch(void* userData); 77 void notifyComplete(); 78 }; 79 80 } // namespace WebCore 81 82 #endif // OfflineAudioDestinationNode_h 83