Reland of Moved ring-buffer related files from common_audio to audio_processing"

webrtc/common_audio/audio_ring_buffer.h

 /*
- *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #ifndef WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_
 #define WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_
 
-#include <stddef.h>
-#include <vector>
-
-struct RingBuffer;
-
-namespace webrtc {
-
-// A ring buffer tailored for float deinterleaved audio. Any operation that
-// cannot be performed as requested will cause a crash (e.g. insufficient data
-// in the buffer to fulfill a read request.)
-class AudioRingBuffer final {
- public:
-  // Specify the number of channels and maximum number of frames the buffer will
-  // contain.
-  AudioRingBuffer(size_t channels, size_t max_frames);
-  ~AudioRingBuffer();
-
-  // Copies |data| to the buffer and advances the write pointer. |channels| must
-  // be the same as at creation time.
-  void Write(const float* const* data, size_t channels, size_t frames);
-
-  // Copies from the buffer to |data| and advances the read pointer. |channels|
-  // must be the same as at creation time.
-  void Read(float* const* data, size_t channels, size_t frames);
-
-  size_t ReadFramesAvailable() const;
-  size_t WriteFramesAvailable() const;
-
-  // Moves the read position. The forward version advances the read pointer
-  // towards the write pointer and the backward verison withdraws the read
-  // pointer away from the write pointer (i.e. flushing and stuffing the buffer
-  // respectively.)
-  void MoveReadPositionForward(size_t frames);
-  void MoveReadPositionBackward(size_t frames);
-
- private:
-  // TODO(kwiberg): Use std::vector<std::unique_ptr<RingBuffer>> instead.
-  std::vector<RingBuffer*> buffers_;
-};
-
-}  // namespace webrtc
+// TODO(peah): Remove as soon as all downstream dependencies are resolved.
+#include "webrtc/modules/audio_processing/utility/audio_ring_buffer.h"
 
 #endif  // WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_