/* * 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)