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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 protected: |
| 31 // Checks the apply_rotation() flag. If the frame needs rotation, and it is a |
| 32 // plain memory frame, it is rotated. Subclasses producing native frames must |
| 33 // handle apply_rotation() themselves. |
| 34 void OnFrame(const cricket::VideoFrame& frame); |
| 35 |
| 36 // Reports the appropriate frame size after adaptation. Returns true |
| 37 // if a frame is wanted. Returns false if there are no interested |
| 38 // sinks, or if the VideoAdapter decides to drop the frame. |
| 39 bool AdaptFrame(int width, |
| 40 int height, |
| 41 int64_t time_us, |
| 42 int* out_width, |
| 43 int* out_height, |
| 44 int* crop_width, |
| 45 int* crop_height, |
| 46 int* crop_x, |
| 47 int* crop_y); |
| 48 |
| 49 // Returns the current value of the apply_rotation flag, derived |
| 50 // from the VideoSinkWants of registered sinks. The value is derived |
| 51 // from sinks' wants, in AddOrUpdateSink and RemoveSink. Beware that |
| 52 // when using this method from a different thread, the value may |
| 53 // become stale before it is used. |
| 54 bool apply_rotation(); |
| 55 |
| 56 cricket::VideoAdapter* video_adapter() { return &video_adapter_; } |
| 57 |
| 58 private: |
| 59 // Implements rtc::VideoSourceInterface. |
| 60 void AddOrUpdateSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink, |
| 61 const rtc::VideoSinkWants& wants) override; |
| 62 void RemoveSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override; |
| 63 |
| 64 // Part of VideoTrackSourceInterface. |
| 65 bool GetStats(Stats* stats) override; |
| 66 |
| 67 void OnSinkWantsChanged(const rtc::VideoSinkWants& wants); |
| 68 |
| 69 rtc::ThreadChecker thread_checker_; |
| 70 |
| 71 cricket::VideoAdapter video_adapter_; |
| 72 |
| 73 rtc::CriticalSection stats_crit_; |
| 74 rtc::Optional<Stats> stats_ GUARDED_BY(stats_crit_); |
| 75 |
| 76 VideoBroadcaster broadcaster_; |
| 77 }; |
| 78 |
| 79 } // namespace rtc |
| 80 |
| 81 #endif // WEBRTC_MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_ |
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