| /* |
| * 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_l3t3.h" |
| |
| #include <vector> |
| |
| #include "api/transport/rtp/dependency_descriptor.h" |
| |
| namespace webrtc { |
| |
| ScalabilityStructureL3T3::~ScalabilityStructureL3T3() = default; |
| |
| FrameDependencyStructure ScalabilityStructureL3T3::DependencyStructure() const { |
| FrameDependencyStructure structure; |
| structure.num_decode_targets = 9; |
| structure.num_chains = 3; |
| structure.decode_target_protected_by_chain = {0, 0, 0, 1, 1, 1, 2, 2, 2}; |
| auto& t = structure.templates; |
| t.resize(15); |
| // Templates are shown in the order frames following them appear in the |
| // stream, but in `structure.templates` array templates are sorted by |
| // (`spatial_id`, `temporal_id`) since that is a dependency descriptor |
| // requirement. Indexes are written in hex for nicer alignment. |
| t[0x1].S(0).T(0).Dtis("SSSSSSSSS").ChainDiffs({0, 0, 0}); |
| t[0x6].S(1).T(0).Dtis("---SSSSSS").ChainDiffs({1, 1, 1}).FrameDiffs({1}); |
| t[0xB].S(2).T(0).Dtis("------SSS").ChainDiffs({2, 1, 1}).FrameDiffs({1}); |
| t[0x3].S(0).T(2).Dtis("--D--R--R").ChainDiffs({3, 2, 1}).FrameDiffs({3}); |
| t[0x8].S(1).T(2).Dtis("-----D--R").ChainDiffs({4, 3, 2}).FrameDiffs({3, 1}); |
| t[0xD].S(2).T(2).Dtis("--------D").ChainDiffs({5, 4, 3}).FrameDiffs({3, 1}); |
| t[0x2].S(0).T(1).Dtis("-DS-RR-RR").ChainDiffs({6, 5, 4}).FrameDiffs({6}); |
| t[0x7].S(1).T(1).Dtis("----DS-RR").ChainDiffs({7, 6, 5}).FrameDiffs({6, 1}); |
| t[0xC].S(2).T(1).Dtis("-------DS").ChainDiffs({8, 7, 6}).FrameDiffs({6, 1}); |
| t[0x4].S(0).T(2).Dtis("--D--R--R").ChainDiffs({9, 8, 7}).FrameDiffs({3}); |
| t[0x9].S(1).T(2).Dtis("-----D--R").ChainDiffs({10, 9, 8}).FrameDiffs({3, 1}); |
| t[0xE].S(2).T(2).Dtis("--------D").ChainDiffs({11, 10, 9}).FrameDiffs({3, 1}); |
| t[0x0].S(0).T(0).Dtis("SSSRRRRRR").ChainDiffs({12, 11, 10}).FrameDiffs({12}); |
| t[0x5].S(1).T(0).Dtis("---SSSRRR").ChainDiffs({1, 1, 1}).FrameDiffs({12, 1}); |
| t[0xA].S(2).T(0).Dtis("------SSS").ChainDiffs({2, 1, 1}).FrameDiffs({12, 1}); |
| return structure; |
| } |
| |
| } // namespace webrtc |