1 /*
2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_SINGLE_RW_FIFO_H_
12 #define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_SINGLE_RW_FIFO_H_
13 
14 #include "system_wrappers/include/atomic32.h"
15 #include "typedefs.h"
16 
17 namespace webrtc {
18 
19 // Implements a lock-free FIFO losely based on
20 // http://src.chromium.org/viewvc/chrome/trunk/src/media/base/audio_fifo.cc
21 // Note that this class assumes there is one producer (writer) and one
22 // consumer (reader) thread.
23 class SingleRwFifo {
24  public:
25   explicit SingleRwFifo(int capacity);
26   ~SingleRwFifo();
27 
28   void Push(int8_t* mem);
29   int8_t* Pop();
30 
31   void Clear();
32 
size()33   int size() { return size_.Value(); }
capacity()34   int capacity() const { return capacity_; }
35 
36  private:
37   std::unique_ptr<int8_t* []> queue_;
38   int capacity_;
39 
40   Atomic32 size_;
41 
42   int read_pos_;
43   int write_pos_;
44 };
45 
46 }  // namespace webrtc
47 
48 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_SINGLE_RW_FIFO_H_
49