Introduce PushPullFIFO class and remove other FIFOs

third_party/WebKit/Source/platform/audio/AudioFIFO.h

Index: third_party/WebKit/Source/platform/audio/AudioFIFO.h
diff --git a/third_party/WebKit/Source/platform/audio/AudioFIFO.h b/third_party/WebKit/Source/platform/audio/AudioFIFO.h
deleted file mode 100644
index ef66f92a98521d0127bff757ecaafb75beaaaed1..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/platform/audio/AudioFIFO.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef AudioFIFO_h
-#define AudioFIFO_h
-
-#include "platform/audio/AudioBus.h"
-#include "wtf/Allocator.h"
-
-namespace blink {
-
-class AudioFIFO {
-  USING_FAST_MALLOC(AudioFIFO);
-  WTF_MAKE_NONCOPYABLE(AudioFIFO);
-
- public:
-  // Create a FIFO large enough to hold |fifoLength| frames of data of
-  // |numberOfChannels| channels.
-  AudioFIFO(unsigned numberOfChannels, size_t fifoLength);
-
-  // Push the data from the bus into the FIFO.
-  void push(const AudioBus*);
-
-  // Consume |framesToConsume| frames of data from the FIFO and put them in
-  // |destination|. The corresponding frames are removed from the FIFO.
-  void consume(AudioBus* destination, size_t framesToConsume);
-
-  // Number of frames of data that are currently in the FIFO.
-  size_t framesInFifo() const { return m_framesInFifo; }
-
- private:
-  // Update the FIFO index by the step, with appropriate wrapping around the
-  // endpoint.
-  int updateIndex(int index, int step) { return (index + step) % m_fifoLength; }
-
-  void findWrapLengths(size_t index,
-                       size_t providerSize,
-                       size_t& part1Length,
-                       size_t& part2Length);
-
-  // The FIFO itself. In reality, the FIFO is a circular buffer.
-  RefPtr<AudioBus> m_fifoAudioBus;
-
-  // The total available space in the FIFO.
-  size_t m_fifoLength;
-
-  // The number of actual elements in the FIFO
-  size_t m_framesInFifo;
-
-  // Where to start reading from the FIFO.
-  size_t m_readIndex;
-
-  // Where to start writing to the FIFO.
-  size_t m_writeIndex;
-};
-
-}  // namespace blink
-
-#endif  // AudioFIFO.h