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 "OfflineAudioDestinationNode.h"
30
31#include "AudioBus.h"
32#include "AudioContext.h"
33#include "HRTFDatabaseLoader.h"
34#include <algorithm>
35#include <wtf/Threading.h>
36
37using namespace std;
38
39namespace WebCore {
40
41const size_t renderQuantumSize = 128;
42
43OfflineAudioDestinationNode::OfflineAudioDestinationNode(AudioContext* context, AudioBuffer* renderTarget)
44 : AudioDestinationNode(context, renderTarget->sampleRate())
45 , m_renderTarget(renderTarget)
46 , m_startedRendering(false)
47{
48 m_renderBus = adoptPtr(new AudioBus(renderTarget->numberOfChannels(), renderQuantumSize));
49
50 initialize();
51}
52
53OfflineAudioDestinationNode::~OfflineAudioDestinationNode()
54{
55 uninitialize();
56}
57
58void OfflineAudioDestinationNode::initialize()
59{
60 if (isInitialized())
61 return;
62
63 AudioNode::initialize();
64}
65
66void OfflineAudioDestinationNode::uninitialize()
67{
68 if (!isInitialized())
69 return;
70
71 AudioNode::uninitialize();
72}
73
74void OfflineAudioDestinationNode::startRendering()
75{
76 ASSERT(isMainThread());
77 ASSERT(m_renderTarget.get());
78 if (!m_renderTarget.get())
79 return;
80
81 if (!m_startedRendering) {
82 m_startedRendering = true;
83 m_renderThread = createThread(OfflineAudioDestinationNode::renderEntry, this, "offline renderer");
84 }
85}
86
87// Do offline rendering in this thread.
88void* OfflineAudioDestinationNode::renderEntry(void* threadData)
89{
90 OfflineAudioDestinationNode* destinationNode = reinterpret_cast<OfflineAudioDestinationNode*>(threadData);
91 ASSERT(destinationNode);
92 destinationNode->render();
93
94 return 0;
95}
96
97void OfflineAudioDestinationNode::render()
98{
99 ASSERT(!isMainThread());
100 ASSERT(m_renderBus.get());
101 if (!m_renderBus.get())
102 return;
103
104 bool channelsMatch = m_renderBus->numberOfChannels() == m_renderTarget->numberOfChannels();
105 ASSERT(channelsMatch);
106 if (!channelsMatch)
107 return;
108
109 bool isRenderBusAllocated = m_renderBus->length() >= renderQuantumSize;
110 ASSERT(isRenderBusAllocated);
111 if (!isRenderBusAllocated)
112 return;
113
114 // Synchronize with HRTFDatabaseLoader.
115 // The database must be loaded before we can proceed.
116 HRTFDatabaseLoader* loader = HRTFDatabaseLoader::loader();
117 ASSERT(loader);
118 if (!loader)
119 return;
120
121 loader->waitForLoaderThreadCompletion();
122
123 // Break up the render target into smaller "render quantize" sized pieces.
124 // Render until we're finished.
125 size_t framesToProcess = m_renderTarget->length();
126 unsigned numberOfChannels = m_renderTarget->numberOfChannels();
127
128 unsigned n = 0;
129 while (framesToProcess > 0) {
130 // Render one render quantum.
131 provideInput(m_renderBus.get(), renderQuantumSize);
132
133 size_t framesAvailableToCopy = min(framesToProcess, renderQuantumSize);
134
135 for (unsigned channelIndex = 0; channelIndex < numberOfChannels; ++channelIndex) {
136 float* source = m_renderBus->channel(channelIndex)->data();
137 float* destination = m_renderTarget->getChannelData(channelIndex)->data();
138 memcpy(destination + n, source, sizeof(float) * framesAvailableToCopy);
139 }
140
141 n += framesAvailableToCopy;
142 framesToProcess -= framesAvailableToCopy;
143 }
144
145 // Our work is done. Let the AudioContext know.
146 callOnMainThread(notifyCompleteDispatch, this);
147}
148
149void OfflineAudioDestinationNode::notifyCompleteDispatch(void* userData)
150{
151 OfflineAudioDestinationNode* destinationNode = static_cast<OfflineAudioDestinationNode*>(userData);
152 ASSERT(destinationNode);
153 if (!destinationNode)
154 return;
155
156 destinationNode->notifyComplete();
157}
158
159void OfflineAudioDestinationNode::notifyComplete()
160{
161 context()->fireCompletionEvent();
162}
163
164} // namespace WebCore
165
166#endif // ENABLE(WEB_AUDIO)