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+/*
+ * Copyright 2021 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 API_VIDEO_TRACK_SOURCE_PROXY_FACTORY_H_
+#define API_VIDEO_TRACK_SOURCE_PROXY_FACTORY_H_
+
+#include "api/media_stream_interface.h"
+
+namespace webrtc {
+
+// Creates a proxy source for |source| which makes sure the real
+// VideoTrackSourceInterface implementation is destroyed on the signaling thread
+// and marshals calls to |worker_thread| and |signaling_thread|.
+rtc::scoped_refptr<VideoTrackSourceInterface> RTC_EXPORT
+CreateVideoTrackSourceProxy(rtc::Thread* signaling_thread,
+ rtc::Thread* worker_thread,
+ VideoTrackSourceInterface* source);
+
+} // namespace webrtc
+
+#endif // API_VIDEO_TRACK_SOURCE_PROXY_FACTORY_H_