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      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 
     42 PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, double sampleRate)
     43 {
     44     return adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
     45 }
     46 
     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 
     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 
     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 
     85 void AudioBuffer::releaseMemory()
     86 {
     87     m_channels.clear();
     88 }
     89 
     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 
     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