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

webrtc/modules/audio_processing/utility/ring_buffer.h

-/*
- *  Copyright (c) 2011 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.
- */
-
-// A ring buffer to hold arbitrary data. Provides no thread safety. Unless
-// otherwise specified, functions return 0 on success and -1 on error.
-
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stddef.h>  // size_t
-
-typedef struct RingBuffer RingBuffer;
-
-// Creates and initializes the buffer. Returns NULL on failure.
-RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size);
-void WebRtc_InitBuffer(RingBuffer* handle);
-void WebRtc_FreeBuffer(void* handle);
-
-// Reads data from the buffer. The |data_ptr| will point to the address where
-// it is located. If all |element_count| data are feasible to read without
-// buffer wrap around |data_ptr| will point to the location in the buffer.
-// Otherwise, the data will be copied to |data| (memory allocation done by the
-// user) and |data_ptr| points to the address of |data|. |data_ptr| is only
-// guaranteed to be valid until the next call to WebRtc_WriteBuffer().
-//
-// To force a copying to |data|, pass a NULL |data_ptr|.
-//
-// Returns number of elements read.
-size_t WebRtc_ReadBuffer(RingBuffer* handle,
-                         void** data_ptr,
-                         void* data,
-                         size_t element_count);
-
-// Writes |data| to buffer and returns the number of elements written.
-size_t WebRtc_WriteBuffer(RingBuffer* handle, const void* data,
-                          size_t element_count);
-
-// Moves the buffer read position and returns the number of elements moved.
-// Positive |element_count| moves the read position towards the write position,
-// that is, flushing the buffer. Negative |element_count| moves the read
-// position away from the the write position, that is, stuffing the buffer.
-// Returns number of elements moved.
-int WebRtc_MoveReadPtr(RingBuffer* handle, int element_count);
-
-// Returns number of available elements to read.
-size_t WebRtc_available_read(const RingBuffer* handle);
-
-// Returns number of available elements for write.
-size_t WebRtc_available_write(const RingBuffer* handle);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_UTILITY_RING_BUFFER_H_