1 /* 2 * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_EXTENSION_H_ 11 #define MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_EXTENSION_H_ 12 13 #include <bitset> 14 #include <cstdint> 15 16 #include "api/array_view.h" 17 #include "api/transport/rtp/dependency_descriptor.h" 18 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" 19 20 namespace webrtc { 21 // Trait to read/write the dependency descriptor extension as described in 22 // https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension 23 // While the format is still in design, the code might change without backward 24 // compatibility. 25 class RtpDependencyDescriptorExtension { 26 public: 27 static constexpr RTPExtensionType kId = kRtpExtensionGenericFrameDescriptor02; 28 // TODO(bugs.webrtc.org/10342): Use uri from the spec when there is one. 29 static constexpr char kUri[] = 30 "https://aomediacodec.github.io/av1-rtp-spec/" 31 "#dependency-descriptor-rtp-header-extension"; 32 33 static bool Parse(rtc::ArrayView<const uint8_t> data, 34 const FrameDependencyStructure* structure, 35 DependencyDescriptor* descriptor); 36 ValueSize(const FrameDependencyStructure & structure,const DependencyDescriptor & descriptor)37 static size_t ValueSize(const FrameDependencyStructure& structure, 38 const DependencyDescriptor& descriptor) { 39 return ValueSize(structure, kAllChainsAreActive, descriptor); 40 } 41 static size_t ValueSize(const FrameDependencyStructure& structure, 42 std::bitset<32> active_chains, 43 const DependencyDescriptor& descriptor); Write(rtc::ArrayView<uint8_t> data,const FrameDependencyStructure & structure,const DependencyDescriptor & descriptor)44 static bool Write(rtc::ArrayView<uint8_t> data, 45 const FrameDependencyStructure& structure, 46 const DependencyDescriptor& descriptor) { 47 return Write(data, structure, kAllChainsAreActive, descriptor); 48 } 49 static bool Write(rtc::ArrayView<uint8_t> data, 50 const FrameDependencyStructure& structure, 51 std::bitset<32> active_chains, 52 const DependencyDescriptor& descriptor); 53 54 private: 55 static constexpr std::bitset<32> kAllChainsAreActive = ~uint32_t{0}; 56 }; 57 58 } // namespace webrtc 59 60 #endif // MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_EXTENSION_H_ 61