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
41namespace blink {
42
43AsyncAudioDecoder::AsyncAudioDecoder()
44    : m_thread(adoptPtr(Platform::current()->createThread("Audio Decoder")))
45{
46}
47
48AsyncAudioDecoder::~AsyncAudioDecoder()
49{
50}
51
52void 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
66void 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
75void 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