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/*
* Copyright (C) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AsyncAudioDecoder_h
#define AsyncAudioDecoder_h
#include <wtf/Forward.h>
#include <wtf/MessageQueue.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class AudioBuffer;
class AudioBufferCallback;
// AsyncAudioDecoder asynchronously decodes audio file data from an ArrayBuffer in a worker thread.
// Upon successful decoding, a completion callback will be invoked with the decoded PCM data in an AudioBuffer.
class AsyncAudioDecoder {
WTF_MAKE_NONCOPYABLE(AsyncAudioDecoder);
public:
AsyncAudioDecoder();
~AsyncAudioDecoder();
// Must be called on the main thread.
void decodeAsync(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback);
private:
class DecodingTask {
WTF_MAKE_NONCOPYABLE(DecodingTask);
public:
static PassOwnPtr<DecodingTask> create(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback);
void decode();
private:
DecodingTask(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback);
ArrayBuffer* audioData() { return m_audioData.get(); }
float sampleRate() const { return m_sampleRate; }
AudioBufferCallback* successCallback() { return m_successCallback.get(); }
AudioBufferCallback* errorCallback() { return m_errorCallback.get(); }
AudioBuffer* audioBuffer() { return m_audioBuffer.get(); }
static void notifyCompleteDispatch(void* userData);
void notifyComplete();
RefPtr<ArrayBuffer> m_audioData;
float m_sampleRate;
RefPtr<AudioBufferCallback> m_successCallback;
RefPtr<AudioBufferCallback> m_errorCallback;
RefPtr<AudioBuffer> m_audioBuffer;
};
static void threadEntry(void* threadData);
void runLoop();
WTF::ThreadIdentifier m_threadID;
Mutex m_threadCreationMutex;
MessageQueue<DecodingTask> m_queue;
};
} // namespace WebCore
#endif // AsyncAudioDecoder_h
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