audio_input_sync_writer.h revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
6#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
7
8#include "base/memory/scoped_vector.h"
9#include "base/process/process.h"
10#include "base/sync_socket.h"
11#include "base/time/time.h"
12#include "media/audio/audio_input_controller.h"
13#include "media/audio/audio_parameters.h"
14#include "media/base/audio_bus.h"
15
16#if defined(OS_POSIX)
17#include "base/file_descriptor_posix.h"
18#endif
19
20namespace base {
21class SharedMemory;
22}
23
24namespace content {
25// A AudioInputController::SyncWriter implementation using SyncSocket. This
26// is used by AudioInputController to provide a low latency data source for
27// transmitting audio packets between the browser process and the renderer
28// process.
29class AudioInputSyncWriter : public media::AudioInputController::SyncWriter {
30 public:
31  explicit AudioInputSyncWriter(base::SharedMemory* shared_memory,
32                                int shared_memory_segment_count,
33                                const media::AudioParameters& params);
34
35  virtual ~AudioInputSyncWriter();
36
37  // media::AudioInputController::SyncWriter implementation.
38  virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE;
39  virtual void Write(const media::AudioBus* data,
40                     double volume,
41                     bool key_pressed) OVERRIDE;
42  virtual void Close() OVERRIDE;
43
44  bool Init();
45  bool PrepareForeignSocket(base::ProcessHandle process_handle,
46                            base::SyncSocket::TransitDescriptor* descriptor);
47
48 private:
49  base::SharedMemory* shared_memory_;
50  uint32 shared_memory_segment_size_;
51  uint32 shared_memory_segment_count_;
52  uint32 current_segment_id_;
53
54  // Socket for transmitting audio data.
55  scoped_ptr<base::CancelableSyncSocket> socket_;
56
57  // Socket to be used by the renderer. The reference is released after
58  // PrepareForeignSocketHandle() is called and ran successfully.
59  scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
60
61  // The time of the creation of this object.
62  base::Time creation_time_;
63
64  // The time of the last Write call.
65  base::Time last_write_time_;
66
67  // Size in bytes of each audio bus.
68  const int audio_bus_memory_size_;
69
70  // Vector of audio buses allocated during construction and deleted in the
71  // destructor.
72  ScopedVector<media::AudioBus> audio_buses_;
73
74  DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
75};
76
77}  // namespace content
78
79#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
80