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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // Low-latency audio capturing unit utilizing audio input stream provided | 5 // Low-latency audio capturing unit utilizing audio input stream provided |
6 // by browser process through IPC. | 6 // by browser process through IPC. |
7 // | 7 // |
8 // Relationship of classes: | 8 // Relationship of classes: |
9 // | 9 // |
10 // AudioInputController AudioInputDevice | 10 // AudioInputController AudioInputDevice |
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82 // TODO(henrika): This class is based on the AudioDevice class and it has | 82 // TODO(henrika): This class is based on the AudioDevice class and it has |
83 // many components in common. Investigate potential for re-factoring. | 83 // many components in common. Investigate potential for re-factoring. |
84 // TODO(henrika): Add support for event handling (e.g. OnStateChanged, | 84 // TODO(henrika): Add support for event handling (e.g. OnStateChanged, |
85 // OnCaptureStopped etc.) and ensure that we can deliver these notifications | 85 // OnCaptureStopped etc.) and ensure that we can deliver these notifications |
86 // to any clients using this class. | 86 // to any clients using this class. |
87 class CONTENT_EXPORT AudioInputDevice | 87 class CONTENT_EXPORT AudioInputDevice |
88 : public AudioInputMessageFilter::Delegate, | 88 : public AudioInputMessageFilter::Delegate, |
89 public base::DelegateSimpleThread::Delegate, | 89 public base::DelegateSimpleThread::Delegate, |
90 public base::RefCountedThreadSafe<AudioInputDevice> { | 90 public base::RefCountedThreadSafe<AudioInputDevice> { |
91 public: | 91 public: |
92 class CaptureCallback { | 92 class CONTENT_EXPORT CaptureCallback { |
93 public: | 93 public: |
94 virtual void Capture(const std::vector<float*>& audio_data, | 94 virtual void Capture(const std::vector<float*>& audio_data, |
95 size_t number_of_frames, | 95 size_t number_of_frames, |
96 size_t audio_delay_milliseconds) = 0; | 96 size_t audio_delay_milliseconds) = 0; |
97 protected: | 97 protected: |
98 virtual ~CaptureCallback() {} | 98 virtual ~CaptureCallback() {} |
99 }; | 99 }; |
100 | 100 |
101 class CaptureEventHandler { | 101 class CONTENT_EXPORT CaptureEventHandler { |
102 public: | 102 public: |
103 // Notification to the client that the device with the specific index has | 103 // Notification to the client that the device with the specific index has |
104 // been started. This callback is triggered as a result of StartDevice(). | 104 // been started. This callback is triggered as a result of StartDevice(). |
105 virtual void OnDeviceStarted(int device_index) = 0; | 105 virtual void OnDeviceStarted(int device_index) = 0; |
106 | 106 |
107 // Notification to the client that the device has been stopped. | 107 // Notification to the client that the device has been stopped. |
108 virtual void OnDeviceStopped() = 0; | 108 virtual void OnDeviceStopped() = 0; |
109 | 109 |
110 protected: | 110 protected: |
111 virtual ~CaptureEventHandler() {} | 111 virtual ~CaptureEventHandler() {} |
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212 // callback. Only modified on the IO thread. | 212 // callback. Only modified on the IO thread. |
213 bool pending_device_ready_; | 213 bool pending_device_ready_; |
214 | 214 |
215 scoped_ptr<base::SharedMemory> shared_memory_; | 215 scoped_ptr<base::SharedMemory> shared_memory_; |
216 scoped_ptr<base::SyncSocket> socket_; | 216 scoped_ptr<base::SyncSocket> socket_; |
217 | 217 |
218 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputDevice); | 218 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputDevice); |
219 }; | 219 }; |
220 | 220 |
221 #endif // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_DEVICE_H_ | 221 #endif // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_DEVICE_H_ |
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