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 "webrtc/base/scoped_ptr.h"
15 #include "webrtc/system_wrappers/interface/atomic32.h"
16 #include "webrtc/typedefs.h"
17 
18 namespace webrtc {
19 
20 // Implements a lock-free FIFO losely based on
21 // http://src.chromium.org/viewvc/chrome/trunk/src/media/base/audio_fifo.cc
22 // Note that this class assumes there is one producer (writer) and one
23 // consumer (reader) thread.
24 class SingleRwFifo {
25  public:
26   explicit SingleRwFifo(int capacity);
27   ~SingleRwFifo();
28 
29   void Push(int8_t* mem);
30   int8_t* Pop();
31 
32   void Clear();
33 
34   int size() { return size_.Value(); }
35   int capacity() const { return capacity_; }
36 
37  private:
38   rtc::scoped_ptr<int8_t* []> queue_;
39   int capacity_;
40 
41   Atomic32 size_;
42 
43   int read_pos_;
44   int write_pos_;
45 };
46 
47 }  // namespace webrtc
48 
49 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_SINGLE_RW_FIFO_H_
50