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| 1 /* | |
| 2 * Copyright (C) 2012 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 14 * its contributors may be used to endorse or promote products derived | |
| 15 * from this software without specific prior written permission. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #include "platform/audio/AudioPullFIFO.h" | |
| 30 | |
| 31 namespace blink { | |
| 32 | |
| 33 AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, | |
| 34 unsigned numberOfChannels, | |
| 35 size_t fifoLength, | |
| 36 size_t providerSize) | |
| 37 : m_provider(audioProvider), | |
| 38 m_fifo(numberOfChannels, fifoLength), | |
| 39 m_providerSize(providerSize), | |
| 40 m_tempBus(AudioBus::create(numberOfChannels, providerSize)) {} | |
| 41 | |
| 42 void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume) { | |
| 43 if (!destination) | |
| 44 return; | |
| 45 | |
| 46 if (framesToConsume > m_fifo.framesInFifo()) { | |
| 47 // We don't have enough data in the FIFO to fulfill the request. Ask for | |
| 48 // more data. | |
| 49 fillBuffer(framesToConsume - m_fifo.framesInFifo()); | |
| 50 } | |
| 51 | |
| 52 m_fifo.consume(destination, framesToConsume); | |
| 53 } | |
| 54 | |
| 55 void AudioPullFIFO::fillBuffer(size_t numberOfFrames) { | |
| 56 // Keep asking the provider to give us data until we have received at least | |
| 57 // |numberOfFrames| of data. Stuff the data into the FIFO. | |
| 58 size_t framesProvided = 0; | |
| 59 | |
| 60 while (framesProvided < numberOfFrames) { | |
| 61 m_provider.provideInput(m_tempBus.get(), m_providerSize); | |
| 62 | |
| 63 m_fifo.push(m_tempBus.get()); | |
| 64 | |
| 65 framesProvided += m_providerSize; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 } // namespace blink | |
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Chromium Code Reviews
Issue 2549093009:
Introduce PushPullFIFO class and remove other FIFOs (Closed)
