|  | /* | 
|  | *  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. | 
|  | */ | 
|  |  | 
|  | // This file contains interfaces for MediaStream, MediaTrack and MediaSource. | 
|  | // These interfaces are used for implementing MediaStream and MediaTrack as | 
|  | // defined in http://dev.w3.org/2011/webrtc/editor/webrtc.html#stream-api. These | 
|  | // interfaces must be used only with PeerConnection. | 
|  |  | 
|  | #ifndef API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_ | 
|  | #define API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_ | 
|  |  | 
|  | #include <optional> | 
|  |  | 
|  | namespace webrtc { | 
|  |  | 
|  | // This struct definition describes constraints on the video source that may be | 
|  | // set with VideoTrackSourceInterface::ProcessConstraints. | 
|  | struct VideoTrackSourceConstraints { | 
|  | std::optional<double> min_fps; | 
|  | std::optional<double> max_fps; | 
|  | }; | 
|  |  | 
|  | }  // namespace webrtc | 
|  |  | 
|  | #endif  // API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_ |