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1 // Copyright 2017 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 MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_SYSTEM_H_ | |
6 #define MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_SYSTEM_H_ | |
7 | |
8 #include "media/capture/video/video_capture_device_factory.h" | |
9 #include "media/capture/video/video_capture_device_info.h" | |
10 | |
11 namespace media { | |
12 | |
13 // Layer on top of VideoCaptureDeviceFactory that translates device descriptors | |
14 // to string identifiers and consolidates and caches device descriptors and | |
15 // supported formats into VideoCaptureDeviceInfos. | |
16 class CAPTURE_EXPORT VideoCaptureSystem { | |
17 public: | |
18 using DeviceInfoCallback = | |
19 base::Callback<void(const std::vector<VideoCaptureDeviceInfo>&)>; | |
20 | |
21 explicit VideoCaptureSystem( | |
22 std::unique_ptr<VideoCaptureDeviceFactory> factory); | |
23 ~VideoCaptureSystem(); | |
24 | |
25 // The passed-in |result_callback| must have ownership of the called | |
26 // VideoCaptureSystem instance to guarantee that it stays alive during the | |
27 // asynchronous operation. | |
28 void GetDeviceInfosAsync(const DeviceInfoCallback& result_callback); | |
29 | |
30 // Creates a VideoCaptureDevice object. Returns nullptr if something goes | |
31 // wrong. | |
32 std::unique_ptr<VideoCaptureDevice> CreateDevice( | |
33 const std::string& device_id); | |
34 | |
35 media::VideoCaptureDeviceFactory* video_capture_device_factory() const { | |
36 return factory_.get(); | |
37 } | |
38 | |
39 private: | |
40 void OnDescriptorsReceived( | |
41 const DeviceInfoCallback& result_callback, | |
42 std::unique_ptr<VideoCaptureDeviceDescriptors> descriptors); | |
43 | |
44 // Returns nullptr if no descriptor found. | |
45 const VideoCaptureDeviceInfo* LookupDeviceInfoFromId( | |
46 const std::string& device_id); | |
47 | |
48 const std::unique_ptr<VideoCaptureDeviceFactory> factory_; | |
49 std::vector<VideoCaptureDeviceInfo> devices_info_cache_; | |
50 | |
51 base::ThreadChecker thread_checker_; | |
52 }; | |
53 | |
54 } // namespace media | |
55 | |
56 #endif // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_FACTORY_H_ | |
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