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 "absl/strings/string_view.h" 17 #include "api/array_view.h" 18 #include "api/rtp_parameters.h" 19 #include "api/transport/rtp/dependency_descriptor.h" 20 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" 21 22 namespace webrtc { 23 // Trait to read/write the dependency descriptor extension as described in 24 // https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension 25 // While the format is still in design, the code might change without backward 26 // compatibility. 27 class RtpDependencyDescriptorExtension { 28 public: 29 static constexpr RTPExtensionType kId = kRtpExtensionGenericFrameDescriptor02; Uri()30 static constexpr absl::string_view Uri() { 31 return RtpExtension::kDependencyDescriptorUri; 32 } 33 34 static bool Parse(rtc::ArrayView<const uint8_t> data, 35 const FrameDependencyStructure* structure, 36 DependencyDescriptor* descriptor); 37 ValueSize(const FrameDependencyStructure & structure,const DependencyDescriptor & descriptor)38 static size_t ValueSize(const FrameDependencyStructure& structure, 39 const DependencyDescriptor& descriptor) { 40 return ValueSize(structure, kAllChainsAreActive, descriptor); 41 } 42 static size_t ValueSize(const FrameDependencyStructure& structure, 43 std::bitset<32> active_chains, 44 const DependencyDescriptor& descriptor); Write(rtc::ArrayView<uint8_t> data,const FrameDependencyStructure & structure,const DependencyDescriptor & descriptor)45 static bool Write(rtc::ArrayView<uint8_t> data, 46 const FrameDependencyStructure& structure, 47 const DependencyDescriptor& descriptor) { 48 return Write(data, structure, kAllChainsAreActive, descriptor); 49 } 50 static bool Write(rtc::ArrayView<uint8_t> data, 51 const FrameDependencyStructure& structure, 52 std::bitset<32> active_chains, 53 const DependencyDescriptor& descriptor); 54 55 private: 56 static constexpr std::bitset<32> kAllChainsAreActive = ~uint32_t{0}; 57 }; 58 59 } // namespace webrtc 60 61 #endif // MODULES_RTP_RTCP_SOURCE_RTP_DEPENDENCY_DESCRIPTOR_EXTENSION_H_ 62