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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 "platform/heap/Handle.h"
29 #include "public/platform/WebThread.h"
30 #include "wtf/Forward.h"
31 #include "wtf/OwnPtr.h"
32 
33 namespace blink {
34 
35 class AudioBuffer;
36 class AudioBufferCallback;
37 class AudioBus;
38 
39 // AsyncAudioDecoder asynchronously decodes audio file data from an ArrayBuffer in a worker thread.
40 // Upon successful decoding, a completion callback will be invoked with the decoded PCM data in an AudioBuffer.
41 
42 class AsyncAudioDecoder {
43     WTF_MAKE_NONCOPYABLE(AsyncAudioDecoder);
44 public:
45     AsyncAudioDecoder();
46     ~AsyncAudioDecoder();
47 
48     // Must be called on the main thread.
49     void decodeAsync(ArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback);
50 
51 private:
52     AudioBuffer* createAudioBufferFromAudioBus(AudioBus*);
53     static void decode(ArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback);
54     static void notifyComplete(ArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, AudioBus*);
55 
56     OwnPtr<WebThread> m_thread;
57 };
58 
59 } // namespace blink
60 
61 #endif // AsyncAudioDecoder_h
62