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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 #include "config.h"
26 
27 #if ENABLE(WEB_AUDIO)
28 
29 #include "modules/webaudio/AsyncAudioDecoder.h"
30 
31 #include "modules/webaudio/AudioBuffer.h"
32 #include "modules/webaudio/AudioBufferCallback.h"
33 #include "platform/Task.h"
34 #include "platform/audio/AudioBus.h"
35 #include "platform/audio/AudioFileReader.h"
36 #include "public/platform/Platform.h"
37 #include "wtf/ArrayBuffer.h"
38 #include "wtf/MainThread.h"
39 #include "wtf/PassOwnPtr.h"
40 
41 namespace blink {
42 
AsyncAudioDecoder()43 AsyncAudioDecoder::AsyncAudioDecoder()
44     : m_thread(adoptPtr(Platform::current()->createThread("Audio Decoder")))
45 {
46 }
47 
~AsyncAudioDecoder()48 AsyncAudioDecoder::~AsyncAudioDecoder()
49 {
50 }
51 
decodeAsync(ArrayBuffer * audioData,float sampleRate,AudioBufferCallback * successCallback,AudioBufferCallback * errorCallback)52 void AsyncAudioDecoder::decodeAsync(ArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback)
53 {
54     ASSERT(isMainThread());
55     ASSERT(audioData);
56     if (!audioData)
57         return;
58 
59     // Add a ref to keep audioData alive until completion of decoding.
60     RefPtr<ArrayBuffer> audioDataRef(audioData);
61 
62     // The leak references to successCallback and errorCallback are picked up on notifyComplete.
63     m_thread->postTask(new Task(WTF::bind(&AsyncAudioDecoder::decode, audioDataRef.release().leakRef(), sampleRate, successCallback, errorCallback)));
64 }
65 
decode(ArrayBuffer * audioData,float sampleRate,AudioBufferCallback * successCallback,AudioBufferCallback * errorCallback)66 void AsyncAudioDecoder::decode(ArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback)
67 {
68     RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(audioData->data(), audioData->byteLength(), false, sampleRate);
69 
70     // Decoding is finished, but we need to do the callbacks on the main thread.
71     // The leaked reference to audioBuffer is picked up in notifyComplete.
72     callOnMainThread(WTF::bind(&AsyncAudioDecoder::notifyComplete, audioData, successCallback, errorCallback, bus.release().leakRef()));
73 }
74 
notifyComplete(ArrayBuffer * audioData,AudioBufferCallback * successCallback,AudioBufferCallback * errorCallback,AudioBus * audioBus)75 void AsyncAudioDecoder::notifyComplete(ArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, AudioBus* audioBus)
76 {
77     // Adopt references, so everything gets correctly dereffed.
78     RefPtr<ArrayBuffer> audioDataRef = adoptRef(audioData);
79     RefPtr<AudioBus> audioBusRef = adoptRef(audioBus);
80 
81     AudioBuffer* audioBuffer = AudioBuffer::createFromAudioBus(audioBus);
82     if (audioBuffer && successCallback)
83         successCallback->handleEvent(audioBuffer);
84     else if (errorCallback)
85         errorCallback->handleEvent(audioBuffer);
86 }
87 
88 } // namespace blink
89 
90 #endif // ENABLE(WEB_AUDIO)
91