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 "AudioBuffer.h" 29 #include "AudioDestinationNode.h" 30 #include <wtf/PassRefPtr.h> 31 #include <wtf/RefPtr.h> 32 #include <wtf/Threading.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(); 50 virtual void uninitialize(); 51 sampleRate()52 double sampleRate() const { return m_renderTarget->sampleRate(); } 53 54 void startRendering(); 55 56 private: 57 OfflineAudioDestinationNode(AudioContext*, AudioBuffer* renderTarget); 58 59 // This AudioNode renders into this AudioBuffer. 60 RefPtr<AudioBuffer> m_renderTarget; 61 62 // Temporary AudioBus for each render quantum. 63 OwnPtr<AudioBus> m_renderBus; 64 65 // Rendering thread. 66 volatile ThreadIdentifier m_renderThread; 67 bool m_startedRendering; 68 static void* renderEntry(void* threadData); 69 void render(); 70 71 // For completion callback on main thread. 72 static void notifyCompleteDispatch(void* userData); 73 void notifyComplete(); 74 }; 75 76 } // namespace WebCore 77 78 #endif // OfflineAudioDestinationNode_h 79