File: AudioPullFIFO.cpp

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/*
 * 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 "platform/audio/AudioPullFIFO.h"

namespace blink {

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 blink