modules/video_coding/svc/scalability_structure_l3t1.cc

/*
 *  Copyright (c) 2020 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.
 */
#include "modules/video_coding/svc/scalability_structure_l3t1.h"

#include <vector>

#include "api/transport/rtp/dependency_descriptor.h"

namespace webrtc {

ScalabilityStructureL3T1::~ScalabilityStructureL3T1() = default;

FrameDependencyStructure ScalabilityStructureL3T1::DependencyStructure() const {
  FrameDependencyStructure structure;
  structure.num_decode_targets = 3;
  structure.num_chains = 3;
  structure.decode_target_protected_by_chain = {0, 1, 2};
  auto& templates = structure.templates;
  templates.resize(6);
  templates[0].S(0).Dtis("SRR").ChainDiffs({3, 2, 1}).FrameDiffs({3});
  templates[1].S(0).Dtis("SSS").ChainDiffs({0, 0, 0});
  templates[2].S(1).Dtis("-SR").ChainDiffs({1, 1, 1}).FrameDiffs({3, 1});
  templates[3].S(1).Dtis("-SS").ChainDiffs({1, 1, 1}).FrameDiffs({1});
  templates[4].S(2).Dtis("--S").ChainDiffs({2, 1, 1}).FrameDiffs({3, 1});
  templates[5].S(2).Dtis("--S").ChainDiffs({2, 1, 1}).FrameDiffs({1});
  return structure;
}

}  // namespace webrtc