/* * Copyright (C) 2012 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 "platform/audio/AudioPullFIFO.h" namespace WebCore { AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, unsigned numberOfChannels, size_t fifoLength, size_t providerSize) : m_provider(audioProvider) , m_fifo(numberOfChannels, fifoLength) , m_providerSize(providerSize) , m_tempBus(AudioBus::create(numberOfChannels, providerSize)) { } void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume) { if (!destination) return; if (framesToConsume > m_fifo.framesInFifo()) { // We don't have enough data in the FIFO to fulfill the request. Ask for more data. fillBuffer(framesToConsume - m_fifo.framesInFifo()); } m_fifo.consume(destination, framesToConsume); } void AudioPullFIFO::fillBuffer(size_t numberOfFrames) { // Keep asking the provider to give us data until we have received at least |numberOfFrames| of // data. Stuff the data into the FIFO. size_t framesProvided = 0; while (framesProvided < numberOfFrames) { m_provider.provideInput(m_tempBus.get(), m_providerSize); m_fifo.push(m_tempBus.get()); framesProvided += m_providerSize; } } } // namespace WebCore #endif // ENABLE(WEB_AUDIO)