1 /*
2 * Copyright (C) 2010 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "config.h"
30
31 #if ENABLE(WEB_AUDIO)
32
33 #include "modules/webaudio/AudioBuffer.h"
34
35 #include "bindings/v8/ExceptionState.h"
36 #include "core/dom/ExceptionCode.h"
37 #include "platform/audio/AudioBus.h"
38 #include "platform/audio/AudioFileReader.h"
39 #include "modules/webaudio/AudioContext.h"
40
41 namespace WebCore {
42
minAllowedSampleRate()43 float AudioBuffer::minAllowedSampleRate()
44 {
45 return 22050;
46 }
47
maxAllowedSampleRate()48 float AudioBuffer::maxAllowedSampleRate()
49 {
50 return 96000;
51 }
52
create(unsigned numberOfChannels,size_t numberOfFrames,float sampleRate)53 PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
54 {
55 if (sampleRate < minAllowedSampleRate() || sampleRate > maxAllowedSampleRate() || numberOfChannels > AudioContext::maxNumberOfChannels() || !numberOfFrames)
56 return 0;
57
58 RefPtr<AudioBuffer> buffer = adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
59
60 if (!buffer->createdSuccessfully(numberOfChannels))
61 return 0;
62 return buffer;
63 }
64
createFromAudioFileData(const void * data,size_t dataSize,bool mixToMono,float sampleRate)65 PassRefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
66 {
67 RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
68 if (bus.get()) {
69 RefPtr<AudioBuffer> buffer = adoptRef(new AudioBuffer(bus.get()));
70 if (buffer->createdSuccessfully(bus->numberOfChannels()))
71 return buffer;
72 }
73
74 return 0;
75 }
76
createdSuccessfully(unsigned desiredNumberOfChannels) const77 bool AudioBuffer::createdSuccessfully(unsigned desiredNumberOfChannels) const
78 {
79 return numberOfChannels() == desiredNumberOfChannels;
80 }
81
AudioBuffer(unsigned numberOfChannels,size_t numberOfFrames,float sampleRate)82 AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
83 : m_gain(1.0)
84 , m_sampleRate(sampleRate)
85 , m_length(numberOfFrames)
86 {
87 ScriptWrappable::init(this);
88 m_channels.reserveCapacity(numberOfChannels);
89
90 for (unsigned i = 0; i < numberOfChannels; ++i) {
91 RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
92 // If the channel data array could not be created, just return. The caller will need to
93 // check that the desired number of channels were created.
94 if (!channelDataArray) {
95 return;
96 }
97
98 channelDataArray->setNeuterable(false);
99 m_channels.append(channelDataArray);
100 }
101 }
102
AudioBuffer(AudioBus * bus)103 AudioBuffer::AudioBuffer(AudioBus* bus)
104 : m_gain(1.0)
105 , m_sampleRate(bus->sampleRate())
106 , m_length(bus->length())
107 {
108 ScriptWrappable::init(this);
109 // Copy audio data from the bus to the Float32Arrays we manage.
110 unsigned numberOfChannels = bus->numberOfChannels();
111 m_channels.reserveCapacity(numberOfChannels);
112 for (unsigned i = 0; i < numberOfChannels; ++i) {
113 RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
114 // If the channel data array could not be created, just return. The caller will need to
115 // check that the desired number of channels were created.
116 if (!channelDataArray)
117 return;
118
119 channelDataArray->setNeuterable(false);
120 channelDataArray->setRange(bus->channel(i)->data(), m_length, 0);
121 m_channels.append(channelDataArray);
122 }
123 }
124
releaseMemory()125 void AudioBuffer::releaseMemory()
126 {
127 m_channels.clear();
128 }
129
getChannelData(unsigned channelIndex,ExceptionState & exceptionState)130 PassRefPtr<Float32Array> AudioBuffer::getChannelData(unsigned channelIndex, ExceptionState& exceptionState)
131 {
132 if (channelIndex >= m_channels.size()) {
133 exceptionState.throwDOMException(IndexSizeError, "channel index (" + String::number(channelIndex) + ") exceeds number of channels (" + String::number(m_channels.size()) + ")");
134 return 0;
135 }
136
137 Float32Array* channelData = m_channels[channelIndex].get();
138 return Float32Array::create(channelData->buffer(), channelData->byteOffset(), channelData->length());
139 }
140
getChannelData(unsigned channelIndex)141 Float32Array* AudioBuffer::getChannelData(unsigned channelIndex)
142 {
143 if (channelIndex >= m_channels.size())
144 return 0;
145
146 return m_channels[channelIndex].get();
147 }
148
zero()149 void AudioBuffer::zero()
150 {
151 for (unsigned i = 0; i < m_channels.size(); ++i) {
152 if (getChannelData(i))
153 getChannelData(i)->zeroRange(0, length());
154 }
155 }
156
157 } // namespace WebCore
158
159 #endif // ENABLE(WEB_AUDIO)
160