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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)
     32 
     33 #include "modules/webaudio/AudioBuffer.h"
     34 
     35 #include "bindings/v8/ExceptionState.h"
     36 #include "core/dom/ExceptionCode.h"
     37 #include "core/platform/audio/AudioBus.h"
     38 #include "core/platform/audio/AudioFileReader.h"
     39 #include "modules/webaudio/AudioContext.h"
     40 
     41 namespace WebCore {
     42 
     43 PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     44 {
     45     if (sampleRate < 22050 || sampleRate > 96000 || numberOfChannels > AudioContext::maxNumberOfChannels() || !numberOfFrames)
     46         return 0;
     47 
     48     return adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
     49 }
     50 
     51 PassRefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
     52 {
     53     RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
     54     if (bus.get())
     55         return adoptRef(new AudioBuffer(bus.get()));
     56 
     57     return 0;
     58 }
     59 
     60 AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     61     : m_gain(1.0)
     62     , m_sampleRate(sampleRate)
     63     , m_length(numberOfFrames)
     64 {
     65     ScriptWrappable::init(this);
     66     m_channels.reserveCapacity(numberOfChannels);
     67 
     68     for (unsigned i = 0; i < numberOfChannels; ++i) {
     69         RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
     70         channelDataArray->setNeuterable(false);
     71         m_channels.append(channelDataArray);
     72     }
     73 }
     74 
     75 AudioBuffer::AudioBuffer(AudioBus* bus)
     76     : m_gain(1.0)
     77     , m_sampleRate(bus->sampleRate())
     78     , m_length(bus->length())
     79 {
     80     ScriptWrappable::init(this);
     81     // Copy audio data from the bus to the Float32Arrays we manage.
     82     unsigned numberOfChannels = bus->numberOfChannels();
     83     m_channels.reserveCapacity(numberOfChannels);
     84     for (unsigned i = 0; i < numberOfChannels; ++i) {
     85         RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
     86         channelDataArray->setNeuterable(false);
     87         channelDataArray->setRange(bus->channel(i)->data(), m_length, 0);
     88         m_channels.append(channelDataArray);
     89     }
     90 }
     91 
     92 void AudioBuffer::releaseMemory()
     93 {
     94     m_channels.clear();
     95 }
     96 
     97 PassRefPtr<Float32Array> AudioBuffer::getChannelData(unsigned channelIndex, ExceptionState& es)
     98 {
     99     if (channelIndex >= m_channels.size()) {
    100         es.throwDOMException(SyntaxError);
    101         return 0;
    102     }
    103 
    104     Float32Array* channelData = m_channels[channelIndex].get();
    105     return Float32Array::create(channelData->buffer(), channelData->byteOffset(), channelData->length());
    106 }
    107 
    108 Float32Array* AudioBuffer::getChannelData(unsigned channelIndex)
    109 {
    110     if (channelIndex >= m_channels.size())
    111         return 0;
    112 
    113     return m_channels[channelIndex].get();
    114 }
    115 
    116 void AudioBuffer::zero()
    117 {
    118     for (unsigned i = 0; i < m_channels.size(); ++i) {
    119         if (getChannelData(i))
    120             getChannelData(i)->zeroRange(0, length());
    121     }
    122 }
    123 
    124 } // namespace WebCore
    125 
    126 #endif // ENABLE(WEB_AUDIO)
    127