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