audio_player.h revision 5821806d5e7f356e8fa4b058a389a808ea183019 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef REMOTING_CLIENT_AUDIO_PLAYER_H_
6#define REMOTING_CLIENT_AUDIO_PLAYER_H_
7
8#include <list>
9
10#include "base/memory/scoped_ptr.h"
11#include "base/synchronization/lock.h"
12#include "remoting/proto/audio.pb.h"
13
14namespace remoting {
15
16class AudioPlayer {
17 public:
18  virtual ~AudioPlayer();
19
20  void ProcessAudioPacket(scoped_ptr<AudioPacket> packet);
21
22 protected:
23  AudioPlayer();
24
25  // Return the recommended number of samples to include in a frame.
26  virtual uint32 GetSamplesPerFrame() = 0;
27
28  // Resets the audio player and starts playback.
29  // Returns true on success.
30  virtual bool ResetAudioPlayer(AudioPacket::SamplingRate sampling_rate) = 0;
31
32  // Function called by the browser when it needs more audio samples.
33  static void AudioPlayerCallback(void* samples,
34                                  uint32 buffer_size,
35                                  void* data);
36
37 private:
38  friend class AudioPlayerTest;
39
40  typedef std::list<AudioPacket*> AudioPacketQueue;
41
42  void ResetQueue();
43  void FillWithSamples(void* samples, uint32 buffer_size);
44
45  AudioPacket::SamplingRate sampling_rate_;
46
47  bool start_failed_;
48
49  // Protects |queued_packets_|, |queued_samples_ and |bytes_consumed_|. This is
50  // necessary to prevent races, because Pepper will call the  callback on a
51  // separate thread.
52  base::Lock lock_;
53
54  AudioPacketQueue queued_packets_;
55  int queued_samples_;
56
57  // The number of bytes from |queued_packets_| that have been consumed.
58  size_t bytes_consumed_;
59
60  DISALLOW_COPY_AND_ASSIGN(AudioPlayer);
61};
62
63}  // namespace remoting
64
65#endif  // REMOTING_CLIENT_AUDIO_PLAYER_H_
66