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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_THREAD_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_DEVICE_THREAD_H_ |
6 #define CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_THREAD_H_ | 6 #define MEDIA_AUDIO_AUDIO_DEVICE_THREAD_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
11 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
12 #include "base/shared_memory.h" | 12 #include "base/shared_memory.h" |
13 #include "base/sync_socket.h" | 13 #include "base/sync_socket.h" |
14 #include "base/synchronization/lock.h" | 14 #include "base/synchronization/lock.h" |
15 #include "content/common/content_export.h" | 15 #include "media/base/media_export.h" |
16 #include "media/audio/audio_parameters.h" | 16 #include "media/audio/audio_parameters.h" |
17 | 17 |
18 class MessageLoop; | 18 class MessageLoop; |
19 | 19 |
20 namespace media { | |
21 | |
20 // Data transfer between browser and render process uses a combination | 22 // Data transfer between browser and render process uses a combination |
21 // of sync sockets and shared memory. To read from the socket and render | 23 // of sync sockets and shared memory. To read from the socket and render |
22 // data, we use a worker thread, a.k.a. the AudioDeviceThread, which reads | 24 // data, we use a worker thread, a.k.a. the AudioDeviceThread, which reads |
23 // data from the browser via the socket and fills the shared memory from the | 25 // data from the browser via the socket and fills the shared memory from the |
24 // audio thread via the AudioDeviceThread::Callback interface/class. | 26 // audio thread via the AudioDeviceThread::Callback interface/class. |
25 // For more details see the documentation in audio_device.h. | 27 // For more details see the documentation in audio_device.h. |
26 // | 28 // |
27 // TODO(tommi): Multiple Audio[Input]Device instances should be able to share | 29 // TODO(tommi): Multiple Audio[Input]Device instances should be able to share |
28 // the same thread instead of spinning one per instance. | 30 // the same thread instead of spinning one per instance. |
29 class CONTENT_EXPORT AudioDeviceThread { | 31 class MEDIA_EXPORT AudioDeviceThread { |
30 public: | 32 public: |
31 // This is the callback interface/base class that Audio[Input]Device | 33 // This is the callback interface/base class that Audio[Input]Device |
32 // implements to render input/output data. The callback happens on the | 34 // implements to render input/output data. The callback happens on the |
33 // AudioDevice thread. | 35 // AudioOutputDevice thread. |
henrika (OOO until Aug 14)
2012/07/27 11:08:57
Add AudioInputDevice thread and update AudioInputD
tommi (sloooow) - chröme
2012/07/27 11:40:05
Done.
| |
34 class Callback { | 36 class Callback { |
35 public: | 37 public: |
36 Callback(const media::AudioParameters& audio_parameters, | 38 Callback(const AudioParameters& audio_parameters, |
37 base::SharedMemoryHandle memory, | 39 base::SharedMemoryHandle memory, |
38 int memory_length); | 40 int memory_length); |
39 virtual ~Callback(); | 41 virtual ~Callback(); |
40 | 42 |
41 // One time initialization for the callback object on the audio thread. | 43 // One time initialization for the callback object on the audio thread. |
42 void InitializeOnAudioThread(); | 44 void InitializeOnAudioThread(); |
43 | 45 |
44 // Derived implementations must call shared_memory_.Map appropriately | 46 // Derived implementations must call shared_memory_.Map appropriately |
45 // before Process can be called. | 47 // before Process can be called. |
46 virtual void MapSharedMemory() = 0; | 48 virtual void MapSharedMemory() = 0; |
47 | 49 |
48 // Called whenever we receive notifications about pending data. | 50 // Called whenever we receive notifications about pending data. |
49 virtual void Process(int pending_data) = 0; | 51 virtual void Process(int pending_data) = 0; |
50 | 52 |
51 protected: | 53 protected: |
52 // Protected so that derived classes can access directly. | 54 // Protected so that derived classes can access directly. |
53 // The variables are 'const' since values are calculated/set in the | 55 // The variables are 'const' since values are calculated/set in the |
54 // constructor and must never change. | 56 // constructor and must never change. |
55 const media::AudioParameters audio_parameters_; | 57 const AudioParameters audio_parameters_; |
56 const int samples_per_ms_; | 58 const int samples_per_ms_; |
57 const int bytes_per_ms_; | 59 const int bytes_per_ms_; |
58 | 60 |
59 // Audio buffers that are allocated in InitializeOnAudioThread() based on | 61 // Audio buffers that are allocated in InitializeOnAudioThread() based on |
60 // info from audio_parameters_. | 62 // info from audio_parameters_. |
61 std::vector<float*> audio_data_; | 63 std::vector<float*> audio_data_; |
62 base::SharedMemory shared_memory_; | 64 base::SharedMemory shared_memory_; |
63 const int memory_length_; | 65 const int memory_length_; |
64 | 66 |
65 private: | 67 private: |
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97 // while still synchronized with SimpleThread::Start() to provide | 99 // while still synchronized with SimpleThread::Start() to provide |
98 // reliable initialization. | 100 // reliable initialization. |
99 class Thread; | 101 class Thread; |
100 | 102 |
101 base::Lock thread_lock_; | 103 base::Lock thread_lock_; |
102 scoped_refptr<AudioDeviceThread::Thread> thread_; | 104 scoped_refptr<AudioDeviceThread::Thread> thread_; |
103 | 105 |
104 DISALLOW_COPY_AND_ASSIGN(AudioDeviceThread); | 106 DISALLOW_COPY_AND_ASSIGN(AudioDeviceThread); |
105 }; | 107 }; |
106 | 108 |
107 #endif // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_THREAD_H_ | 109 } // namespace media. |
110 | |
111 #endif // MEDIA_AUDIO_AUDIO_DEVICE_THREAD_H_ | |
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