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1 /* | |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #ifndef WEBRTC_MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_ | |
12 #define WEBRTC_MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_ | |
13 | |
14 #include "webrtc/api/mediastreaminterface.h" | |
15 #include "webrtc/api/notifier.h" | |
16 #include "webrtc/media/base/videoadapter.h" | |
17 #include "webrtc/media/base/videobroadcaster.h" | |
18 | |
19 namespace rtc { | |
20 | |
21 // Base class for sources which needs video adaptation, e.g., video | |
22 // capture sources. Sinks must be added and removed on one and only | |
23 // one thread, while AdaptFrame and OnFrame may be called on any | |
24 // thread. | |
25 class AdaptedVideoTrackSource | |
26 : public webrtc::Notifier<webrtc::VideoTrackSourceInterface> { | |
27 public: | |
28 AdaptedVideoTrackSource(); | |
29 | |
30 // Returns false if no stats are available, e.g, for a remote | |
31 // source, or a source which has not seen its first frame yet. | |
32 // Should avoid blocking. | |
33 bool GetStats(Stats* stats) override; | |
perkj_webrtc
2016/09/21 08:59:23
Also private?
| |
34 | |
35 protected: | |
36 // Checks the apply_rotation_ flag. If the frame needs rotation, it | |
37 // will be rotated if it is a plain memory frame, and discarded it | |
38 // if it is a native frame. (Subclasses producing native frames must | |
39 // handle apply_rotation_ themselves). | |
40 void OnFrame(const cricket::VideoFrame& frame); | |
41 | |
42 // Reports the appropriate frame size after adaptation. Returns true | |
43 // if a frame is wanted. Returns false if there are no interested | |
44 // sinks, or if the VideoAdapter decides to drop the frame. | |
45 bool AdaptFrame(int width, | |
46 int height, | |
47 int64_t time_us, | |
48 int* out_width, | |
49 int* out_height, | |
50 int* crop_width, | |
51 int* crop_height, | |
52 int* crop_x, | |
53 int* crop_y); | |
54 | |
55 // Returns the current value of the apply_rotation flag, derived | |
56 // from the VideoSinkWants of registered sinks. Beware that when | |
57 // using this method, the value may become stale before it is used. | |
58 bool apply_rotation(); | |
59 | |
60 cricket::VideoAdapter* video_adapter() { return &video_adapter_; } | |
61 | |
62 private: | |
63 // Implements rtc::VideoSourceInterface. | |
64 void AddOrUpdateSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink, | |
65 const rtc::VideoSinkWants& wants) override; | |
66 void RemoveSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override; | |
67 | |
68 void OnSinkWantsChanged(const rtc::VideoSinkWants& wants); | |
69 | |
70 rtc::ThreadChecker thread_checker_; | |
71 | |
72 cricket::VideoAdapter video_adapter_; | |
73 | |
74 rtc::CriticalSection apply_rotation_crit_; | |
75 bool apply_rotation_ GUARDED_BY(apply_rotation_crit_); | |
76 | |
77 rtc::CriticalSection stats_crit_; | |
78 rtc::Optional<Stats> stats_ GUARDED_BY(stats_crit_); | |
79 | |
80 VideoBroadcaster broadcaster_; | |
81 }; | |
82 | |
83 } // namespace rtc | |
84 | |
85 #endif // WEBRTC_MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_ | |
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