modules/video_coding/svc/scalability_structure_l2t2.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_l2t2.h"

#include <vector>

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

namespace webrtc {

ScalabilityStructureL2T2::~ScalabilityStructureL2T2() = default;

FrameDependencyStructure ScalabilityStructureL2T2::DependencyStructure() const {
  FrameDependencyStructure structure;
  structure.num_decode_targets = 4;
  structure.num_chains = 2;
  structure.decode_target_protected_by_chain = {0, 0, 1, 1};
  structure.templates.resize(6);
  auto& templates = structure.templates;
  templates[0].S(0).T(0).Dtis("SSSS").ChainDiffs({0, 0});
  templates[1].S(0).T(0).Dtis("SSRR").ChainDiffs({4, 3}).FrameDiffs({4});
  templates[2].S(0).T(1).Dtis("-D-R").ChainDiffs({2, 1}).FrameDiffs({2});
  templates[3].S(1).T(0).Dtis("--SS").ChainDiffs({1, 1}).FrameDiffs({1});
  templates[4].S(1).T(0).Dtis("--SS").ChainDiffs({1, 1}).FrameDiffs({4, 1});
  templates[5].S(1).T(1).Dtis("---D").ChainDiffs({3, 2}).FrameDiffs({2, 1});
  return structure;
}

}  // namespace webrtc