Introduce PushPullFIFO class and remove other FIFOs

third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp

-/*
- * 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:
- *
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- *     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.
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- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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-
-#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