67dcb4b54d
The extension (and thus structures to carry it) are designed in particular for client<->SFU link. Putting the structure into api acknowledges it can be reused by SFU projects Bug: webrtc:10342 Change-Id: I8ca1f5046abadf6aa16200443c4892e9a2a928b4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166467 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30324}
105 lines
3.6 KiB
C++
105 lines
3.6 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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#ifndef API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
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#define API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
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#include <stdint.h>
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#include <memory>
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#include <vector>
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#include "absl/container/inlined_vector.h"
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#include "absl/types/optional.h"
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namespace webrtc {
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// Structures to build and parse dependency descriptor as described in
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// https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension
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class RenderResolution {
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public:
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constexpr RenderResolution() = default;
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constexpr RenderResolution(int width, int height)
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: width_(width), height_(height) {}
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RenderResolution(const RenderResolution&) = default;
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RenderResolution& operator=(const RenderResolution&) = default;
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friend bool operator==(const RenderResolution& lhs,
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const RenderResolution& rhs) {
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return lhs.width_ == rhs.width_ && lhs.height_ == rhs.height_;
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}
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constexpr int Width() const { return width_; }
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constexpr int Height() const { return height_; }
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private:
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int width_ = 0;
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int height_ = 0;
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};
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// Relationship of a frame to a Decode target.
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enum class DecodeTargetIndication {
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kNotPresent = 0, // DecodeTargetInfo symbol '-'
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kDiscardable = 1, // DecodeTargetInfo symbol 'D'
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kSwitch = 2, // DecodeTargetInfo symbol 'S'
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kRequired = 3 // DecodeTargetInfo symbol 'R'
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};
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struct FrameDependencyTemplate {
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friend bool operator==(const FrameDependencyTemplate& lhs,
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const FrameDependencyTemplate& rhs) {
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return lhs.spatial_id == rhs.spatial_id &&
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lhs.temporal_id == rhs.temporal_id &&
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lhs.decode_target_indications == rhs.decode_target_indications &&
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lhs.frame_diffs == rhs.frame_diffs &&
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lhs.chain_diffs == rhs.chain_diffs;
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}
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int spatial_id = 0;
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int temporal_id = 0;
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absl::InlinedVector<DecodeTargetIndication, 10> decode_target_indications;
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absl::InlinedVector<int, 4> frame_diffs;
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absl::InlinedVector<int, 4> chain_diffs;
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};
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struct FrameDependencyStructure {
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friend bool operator==(const FrameDependencyStructure& lhs,
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const FrameDependencyStructure& rhs) {
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return lhs.num_decode_targets == rhs.num_decode_targets &&
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lhs.num_chains == rhs.num_chains &&
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lhs.decode_target_protected_by_chain ==
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rhs.decode_target_protected_by_chain &&
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lhs.resolutions == rhs.resolutions && lhs.templates == rhs.templates;
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}
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int structure_id = 0;
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int num_decode_targets = 0;
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int num_chains = 0;
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// If chains are used (num_chains > 0), maps decode target index into index of
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// the chain protecting that target or |num_chains| value if decode target is
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// not protected by a chain.
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absl::InlinedVector<int, 10> decode_target_protected_by_chain;
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absl::InlinedVector<RenderResolution, 4> resolutions;
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std::vector<FrameDependencyTemplate> templates;
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};
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struct DependencyDescriptor {
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bool first_packet_in_frame = true;
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bool last_packet_in_frame = true;
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int frame_number = 0;
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FrameDependencyTemplate frame_dependencies;
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absl::optional<RenderResolution> resolution;
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absl::optional<uint32_t> active_decode_targets_bitmask;
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std::unique_ptr<FrameDependencyStructure> attached_structure;
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};
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} // namespace webrtc
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#endif // API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
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