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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "modules/webaudio/AudioBuffer.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "platform/audio/AudioBus.h"
#include "platform/audio/AudioFileReader.h"
#include "modules/webaudio/AudioContext.h"
namespace WebCore {
float AudioBuffer::minAllowedSampleRate()
{
return 22050;
}
float AudioBuffer::maxAllowedSampleRate()
{
return 96000;
}
PassRefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
{
if (sampleRate < minAllowedSampleRate() || sampleRate > maxAllowedSampleRate() || numberOfChannels > AudioContext::maxNumberOfChannels() || !numberOfFrames)
return 0;
RefPtr<AudioBuffer> buffer = adoptRef(new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
if (!buffer->createdSuccessfully(numberOfChannels))
return 0;
return buffer;
}
PassRefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
{
RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
if (bus.get()) {
RefPtr<AudioBuffer> buffer = adoptRef(new AudioBuffer(bus.get()));
if (buffer->createdSuccessfully(bus->numberOfChannels()))
return buffer;
}
return 0;
}
bool AudioBuffer::createdSuccessfully(unsigned desiredNumberOfChannels) const
{
return numberOfChannels() == desiredNumberOfChannels;
}
AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
: m_gain(1.0)
, m_sampleRate(sampleRate)
, m_length(numberOfFrames)
{
ScriptWrappable::init(this);
m_channels.reserveCapacity(numberOfChannels);
for (unsigned i = 0; i < numberOfChannels; ++i) {
RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
// If the channel data array could not be created, just return. The caller will need to
// check that the desired number of channels were created.
if (!channelDataArray) {
return;
}
channelDataArray->setNeuterable(false);
m_channels.append(channelDataArray);
}
}
AudioBuffer::AudioBuffer(AudioBus* bus)
: m_gain(1.0)
, m_sampleRate(bus->sampleRate())
, m_length(bus->length())
{
ScriptWrappable::init(this);
// Copy audio data from the bus to the Float32Arrays we manage.
unsigned numberOfChannels = bus->numberOfChannels();
m_channels.reserveCapacity(numberOfChannels);
for (unsigned i = 0; i < numberOfChannels; ++i) {
RefPtr<Float32Array> channelDataArray = Float32Array::create(m_length);
// If the channel data array could not be created, just return. The caller will need to
// check that the desired number of channels were created.
if (!channelDataArray)
return;
channelDataArray->setNeuterable(false);
channelDataArray->setRange(bus->channel(i)->data(), m_length, 0);
m_channels.append(channelDataArray);
}
}
void AudioBuffer::releaseMemory()
{
m_channels.clear();
}
PassRefPtr<Float32Array> AudioBuffer::getChannelData(unsigned channelIndex, ExceptionState& exceptionState)
{
if (channelIndex >= m_channels.size()) {
exceptionState.throwDOMException(IndexSizeError, "channel index (" + String::number(channelIndex) + ") exceeds number of channels (" + String::number(m_channels.size()) + ")");
return 0;
}
Float32Array* channelData = m_channels[channelIndex].get();
return Float32Array::create(channelData->buffer(), channelData->byteOffset(), channelData->length());
}
Float32Array* AudioBuffer::getChannelData(unsigned channelIndex)
{
if (channelIndex >= m_channels.size())
return 0;
return m_channels[channelIndex].get();
}
void AudioBuffer::zero()
{
for (unsigned i = 0; i < m_channels.size(); ++i) {
if (getChannelData(i))
getChannelData(i)->zeroRange(0, length());
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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