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 AsyncAudioDecoder_h 26#define AsyncAudioDecoder_h 27 28#include <memory> 29#include <wtf/Forward.h> 30#include <wtf/MessageQueue.h> 31#include <wtf/PassRefPtr.h> 32#include <wtf/RefPtr.h> 33#include <wtf/Threading.h> 34 35namespace JSC { 36class ArrayBuffer; 37} 38 39namespace WebCore { 40 41class AudioBuffer; 42class AudioBufferCallback; 43 44// AsyncAudioDecoder asynchronously decodes audio file data from an ArrayBuffer in a worker thread. 45// Upon successful decoding, a completion callback will be invoked with the decoded PCM data in an AudioBuffer. 46 47class AsyncAudioDecoder { 48 WTF_MAKE_NONCOPYABLE(AsyncAudioDecoder); 49public: 50 AsyncAudioDecoder(); 51 ~AsyncAudioDecoder(); 52 53 // Must be called on the main thread. 54 void decodeAsync(JSC::ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback); 55 56private: 57 class DecodingTask { 58 WTF_MAKE_NONCOPYABLE(DecodingTask); 59 public: 60 static std::unique_ptr<DecodingTask> create(JSC::ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback); 61 62 void decode(); 63 64 private: 65 DecodingTask(JSC::ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback); 66 67 JSC::ArrayBuffer* audioData() { return m_audioData.get(); } 68 float sampleRate() const { return m_sampleRate; } 69 AudioBufferCallback* successCallback() { return m_successCallback.get(); } 70 AudioBufferCallback* errorCallback() { return m_errorCallback.get(); } 71 AudioBuffer* audioBuffer() { return m_audioBuffer.get(); } 72 73 static void notifyCompleteDispatch(void* userData); 74 void notifyComplete(); 75 76 RefPtr<JSC::ArrayBuffer> m_audioData; 77 float m_sampleRate; 78 RefPtr<AudioBufferCallback> m_successCallback; 79 RefPtr<AudioBufferCallback> m_errorCallback; 80 RefPtr<AudioBuffer> m_audioBuffer; 81 }; 82 83 static void threadEntry(void* threadData); 84 void runLoop(); 85 86 WTF::ThreadIdentifier m_threadID; 87 Mutex m_threadCreationMutex; 88 MessageQueue<DecodingTask> m_queue; 89}; 90 91} // namespace WebCore 92 93#endif // AsyncAudioDecoder_h 94