| /* |
| * 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) |