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+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_
+#define MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_
+
+#include "api/mediastreaminterface.h"
+#include "api/notifier.h"
+#include "media/base/videoadapter.h"
+#include "media/base/videobroadcaster.h"
+
+namespace rtc {
+
+// Base class for sources which needs video adaptation, e.g., video
+// capture sources. Sinks must be added and removed on one and only
+// one thread, while AdaptFrame and OnFrame may be called on any
+// thread.
+class AdaptedVideoTrackSource
+    : public webrtc::Notifier<webrtc::VideoTrackSourceInterface> {
+ public:
+  AdaptedVideoTrackSource();
+
+ protected:
+  // Allows derived classes to initialize |video_adapter_| with a custom
+  // alignment.
+  explicit AdaptedVideoTrackSource(int required_alignment);
+  // Checks the apply_rotation() flag. If the frame needs rotation, and it is a
+  // plain memory frame, it is rotated. Subclasses producing native frames must
+  // handle apply_rotation() themselves.
+  void OnFrame(const webrtc::VideoFrame& frame);
+
+  // Reports the appropriate frame size after adaptation. Returns true
+  // if a frame is wanted. Returns false if there are no interested
+  // sinks, or if the VideoAdapter decides to drop the frame.
+  bool AdaptFrame(int width,
+                  int height,
+                  int64_t time_us,
+                  int* out_width,
+                  int* out_height,
+                  int* crop_width,
+                  int* crop_height,
+                  int* crop_x,
+                  int* crop_y);
+
+  // Returns the current value of the apply_rotation flag, derived
+  // from the VideoSinkWants of registered sinks. The value is derived
+  // from sinks' wants, in AddOrUpdateSink and RemoveSink. Beware that
+  // when using this method from a different thread, the value may
+  // become stale before it is used.
+  bool apply_rotation();
+
+  cricket::VideoAdapter* video_adapter() { return &video_adapter_; }
+
+ private:
+  // Implements rtc::VideoSourceInterface.
+  void AddOrUpdateSink(rtc::VideoSinkInterface<webrtc::VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override;
+  void RemoveSink(rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) override;
+
+  // Part of VideoTrackSourceInterface.
+  bool GetStats(Stats* stats) override;
+
+  void OnSinkWantsChanged(const rtc::VideoSinkWants& wants);
+
+  rtc::ThreadChecker thread_checker_;
+
+  cricket::VideoAdapter video_adapter_;
+
+  rtc::CriticalSection stats_crit_;
+  rtc::Optional<Stats> stats_ RTC_GUARDED_BY(stats_crit_);
+
+  VideoBroadcaster broadcaster_;
+};
+
+}  // namespace rtc
+
+#endif  // MEDIA_BASE_ADAPTEDVIDEOTRACKSOURCE_H_