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