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https://github.com/mollyim/webrtc.git
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9aeaa25d4c
* Merge in branch-heads/4103 (M83) * Disable legacy DTLS protocols (before 1.2) * Update sdk/objc modifications for upstream changes * Update ios and mac deployment targets Co-authored-by: Jim Gustafson <jim@signal.org>
58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
/*
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* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/rtp_rtcp/source/rtp_descriptor_authentication.h"
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#include <cstdint>
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#include <vector>
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#include "modules/rtp_rtcp/source/rtp_generic_frame_descriptor.h"
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#include "modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h"
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#include "modules/rtp_rtcp/source/rtp_video_header.h"
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namespace webrtc {
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std::vector<uint8_t> RtpDescriptorAuthentication(
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const RTPVideoHeader& rtp_video_header) {
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if (!rtp_video_header.generic) {
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return {};
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}
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const RTPVideoHeader::GenericDescriptorInfo& descriptor =
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*rtp_video_header.generic;
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// Default way of creating additional data for an encrypted frame.
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if (descriptor.spatial_index < 0 || descriptor.temporal_index < 0 ||
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descriptor.spatial_index >=
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RtpGenericFrameDescriptor::kMaxSpatialLayers ||
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descriptor.temporal_index >=
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RtpGenericFrameDescriptor::kMaxTemporalLayers ||
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descriptor.dependencies.size() >
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RtpGenericFrameDescriptor::kMaxNumFrameDependencies) {
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return {};
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}
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RtpGenericFrameDescriptor frame_descriptor;
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frame_descriptor.SetFirstPacketInSubFrame(true);
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frame_descriptor.SetLastPacketInSubFrame(false);
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frame_descriptor.SetTemporalLayer(descriptor.temporal_index);
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frame_descriptor.SetSpatialLayersBitmask(1 << descriptor.spatial_index);
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frame_descriptor.SetFrameId(descriptor.frame_id & 0xFFFF);
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for (int64_t dependency : descriptor.dependencies) {
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frame_descriptor.AddFrameDependencyDiff(descriptor.frame_id - dependency);
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}
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if (descriptor.dependencies.empty()) {
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frame_descriptor.SetResolution(rtp_video_header.width,
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rtp_video_header.height);
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}
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std::vector<uint8_t> result(
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RtpGenericFrameDescriptorExtension00::ValueSize(frame_descriptor));
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RtpGenericFrameDescriptorExtension00::Write(result, frame_descriptor);
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return result;
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}
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} // namespace webrtc
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