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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2017 Apple 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 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 "AudioBuffer.h"
#include "AudioContext.h"
#include "AudioFileReader.h"
#include <runtime/JSCInlines.h>
#include <runtime/TypedArrayInlines.h>
namespace WebCore {
RefPtr<AudioBuffer> AudioBuffer::create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
{
if (sampleRate < 22050 || sampleRate > 96000 || numberOfChannels > AudioContext::maxNumberOfChannels() || !numberOfFrames)
return nullptr;
auto buffer = adoptRef(*new AudioBuffer(numberOfChannels, numberOfFrames, sampleRate));
if (!buffer->m_length)
return nullptr;
return WTFMove(buffer);
}
RefPtr<AudioBuffer> AudioBuffer::createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
{
RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(data, dataSize, mixToMono, sampleRate);
if (!bus)
return nullptr;
return adoptRef(*new AudioBuffer(*bus));
}
AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
: m_sampleRate(sampleRate)
, m_length(numberOfFrames)
{
m_channels.reserveCapacity(numberOfChannels);
for (unsigned i = 0; i < numberOfChannels; ++i) {
auto channelDataArray = Float32Array::create(m_length);
if (!channelDataArray) {
invalidate();
break;
}
channelDataArray->setNeuterable(false);
m_channels.append(WTFMove(channelDataArray));
}
}
AudioBuffer::AudioBuffer(AudioBus& bus)
: m_sampleRate(bus.sampleRate())
, m_length(bus.length())
{
// 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) {
auto channelDataArray = Float32Array::create(m_length);
if (!channelDataArray) {
invalidate();
break;
}
channelDataArray->setNeuterable(false);
channelDataArray->setRange(bus.channel(i)->data(), m_length, 0);
m_channels.append(WTFMove(channelDataArray));
}
}
void AudioBuffer::invalidate()
{
releaseMemory();
m_length = 0;
}
void AudioBuffer::releaseMemory()
{
auto locker = holdLock(m_channelsLock);
m_channels.clear();
}
ExceptionOr<Ref<Float32Array>> AudioBuffer::getChannelData(unsigned channelIndex)
{
if (channelIndex >= m_channels.size())
return Exception { SyntaxError };
auto& channelData = *m_channels[channelIndex];
auto array = Float32Array::create(channelData.unsharedBuffer(), channelData.byteOffset(), channelData.length());
RELEASE_ASSERT(array);
return array.releaseNonNull();
}
Float32Array* AudioBuffer::channelData(unsigned channelIndex)
{
if (channelIndex >= m_channels.size())
return nullptr;
return m_channels[channelIndex].get();
}
void AudioBuffer::zero()
{
for (auto& channel : m_channels)
channel->zeroRange(0, length());
}
size_t AudioBuffer::memoryCost() const
{
// memoryCost() may be invoked concurrently from a GC thread, and we need to be careful
// about what data we access here and how. We need to hold a lock to prevent m_channels
// from being changed while we iterate it, but calling channel->byteLength() is safe
// because it doesn't involve chasing any pointers that can be nullified while the
// AudioBuffer is alive.
auto locker = holdLock(m_channelsLock);
size_t cost = 0;
for (auto& channel : m_channels)
cost += channel->byteLength();
return cost;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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