chromium/third_party/webrtc/pc/simulcast_description.h

/*
 *  Copyright 2018 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 PC_SIMULCAST_DESCRIPTION_H_
#define PC_SIMULCAST_DESCRIPTION_H_

#include <stddef.h>

#include <string>
#include <vector>

#include "absl/strings/string_view.h"

namespace cricket {

// Describes a Simulcast Layer.
// Each simulcast layer has a rid as the identifier and a paused flag.
// See also: https://tools.ietf.org/html/draft-ietf-mmusic-rid-15 for
// an explanation about rids.
struct SimulcastLayer final { … };

// Describes a list of Simulcast layers.
// Simulcast layers are specified in order of preference.
// Each layer can have a list of alternatives (in order of preference).
// https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-13#section-5.1
// Example Usage:
//   To populate a list that specifies the following:
//     1. Layer 1 or Layer 2
//     2. Layer 3
//     3. Layer 4 or Layer 5
//   Use the following code:
//     SimulcastLayerList list;
//     list.AddLayerWithAlternatives(
//            {SimulcastLayer("1", false), SimulcastLayer("2", false});
//     list.AddLayer("3");
//     list.AddLayerWithAlternatives(
//            {SimulcastLayer("4", false), SimulcastLayer("5", false});
class SimulcastLayerList final { … };

// Describes the simulcast options of a video media section.
// This will list the send and receive layers (along with their alternatives).
// Each simulcast layer has an identifier (rid) and can optionally be paused.
// The order of the layers (as well as alternates) indicates user preference
// from first to last (most preferred to least preferred).
// https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-13#section-5.1
class SimulcastDescription final { … };

}  // namespace cricket

#endif  // PC_SIMULCAST_DESCRIPTION_H_