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) & ENABLE(WEBGL)
32
33 #include "AudioBuffer.h"
34
35 #include "AudioBus.h"
36 #include "AudioFileReader.h"
37 #include "ExceptionCode.h"
38 #include <wtf/OwnPtr.h>
39
40 namespace WebCore {
41
create(unsigned numberOfChannels,size_t numberOfFrames,double sampleRate)42 PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, double sampleRate)
43 {
44 return adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
45 }
46
createFromAudioFileData(const void * data,size_t dataSize,bool mixToMono,double sampleRate)47 PassRefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, double sampleRate)
48 {
49 OwnPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
50 if (bus.get())
51 return adoptRef(new AudioBuffer(bus.get()));
52
53 return 0;
54 }
55
AudioBuffer(unsigned numberOfChannels,size_t numberOfFrames,double sampleRate)56 AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, double sampleRate)
57 : m_gain(1.0)
58 , m_sampleRate(sampleRate)
59 , m_length(numberOfFrames)
60 {
61 m_channels.reserveCapacity(numberOfChannels);
62
63 for (unsigned i = 0; i < numberOfChannels; ++i) {
64 RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
65 m_channels.append(channelDataArray);
66 }
67 }
68
AudioBuffer(AudioBus * bus)69 AudioBuffer::AudioBuffer(AudioBus* bus)
70 : m_gain(1.0)
71 , m_sampleRate(bus->sampleRate())
72 , m_length(bus->length())
73 {
74 // Copy audio data from the bus to the Float32Arrays we manage.
75 unsigned numberOfChannels = bus->numberOfChannels();
76 m_channels.reserveCapacity(numberOfChannels);
77 for (unsigned i = 0; i < numberOfChannels; ++i) {
78 RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
79 ExceptionCode ec;
80 channelDataArray->setRange(bus->channel(i)->data(), m_length, 0, ec);
81 m_channels.append(channelDataArray);
82 }
83 }
84
releaseMemory()85 void AudioBuffer::releaseMemory()
86 {
87 m_channels.clear();
88 }
89
getChannelData(unsigned channelIndex)90 Float32Array* AudioBuffer::getChannelData(unsigned channelIndex)
91 {
92 if (channelIndex >= m_channels.size())
93 return 0;
94
95 return m_channels[channelIndex].get();
96 }
97
zero()98 void AudioBuffer::zero()
99 {
100 for (unsigned i = 0; i < m_channels.size(); ++i) {
101 if (getChannelData(i)) {
102 ExceptionCode ec;
103 getChannelData(i)->zeroRange(0, length(), ec);
104 }
105 }
106 }
107
108 } // namespace WebCore
109
110 #endif // ENABLE(WEB_AUDIO) & ENABLE(WEBGL)
111