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097fc347ec
This is in prep for the migration of all unwrappers to SequenceNumberUnwrapper as a standard implementation. This moves the SeqNumUnwapper to its own header and adds 2 methods to SeqNumUnwrapper which are defined by other unwrappers: * PeekUnwrap * Reset It also adds two implementations for RtpTimestamps and RtpSequenceNumbers. Bug: webrtc:13982 Change-Id: I5baefb2de1db92fe1bb600760bd63b71e9310eb5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288742 Commit-Queue: Evan Shrubsole <eshr@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Auto-Submit: Evan Shrubsole <eshr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39030}
105 lines
3.5 KiB
C++
105 lines
3.5 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 MODULES_VIDEO_CODING_RTP_VP9_REF_FINDER_H_
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#define MODULES_VIDEO_CODING_RTP_VP9_REF_FINDER_H_
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#include <deque>
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#include <map>
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#include <memory>
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#include <set>
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#include "absl/container/inlined_vector.h"
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#include "modules/video_coding/frame_object.h"
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#include "modules/video_coding/rtp_frame_reference_finder.h"
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#include "rtc_base/numerics/sequence_number_unwrapper.h"
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namespace webrtc {
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class RtpVp9RefFinder {
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public:
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RtpVp9RefFinder() = default;
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RtpFrameReferenceFinder::ReturnVector ManageFrame(
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std::unique_ptr<RtpFrameObject> frame);
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void ClearTo(uint16_t seq_num);
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private:
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static constexpr int kFrameIdLength = 1 << 15;
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static constexpr int kMaxGofSaved = 50;
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static constexpr int kMaxLayerInfo = 50;
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static constexpr int kMaxNotYetReceivedFrames = 100;
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static constexpr int kMaxStashedFrames = 100;
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static constexpr int kMaxTemporalLayers = 5;
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enum FrameDecision { kStash, kHandOff, kDrop };
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struct GofInfo {
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GofInfo(GofInfoVP9* gof, uint16_t last_picture_id)
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: gof(gof), last_picture_id(last_picture_id) {}
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GofInfoVP9* gof;
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uint16_t last_picture_id;
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};
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struct UnwrappedTl0Frame {
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int64_t unwrapped_tl0;
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std::unique_ptr<RtpFrameObject> frame;
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};
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FrameDecision ManageFrameFlexible(RtpFrameObject* frame,
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const RTPVideoHeaderVP9& vp9_header);
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FrameDecision ManageFrameGof(RtpFrameObject* frame,
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const RTPVideoHeaderVP9& vp9_header,
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int64_t unwrapped_tl0);
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void RetryStashedFrames(RtpFrameReferenceFinder::ReturnVector& res);
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bool MissingRequiredFrameVp9(uint16_t picture_id, const GofInfo& info);
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void FrameReceivedVp9(uint16_t picture_id, GofInfo* info);
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bool UpSwitchInIntervalVp9(uint16_t picture_id,
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uint8_t temporal_idx,
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uint16_t pid_ref);
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void FlattenFrameIdAndRefs(RtpFrameObject* frame, bool inter_layer_predicted);
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// Frames that have been fully received but didn't have all the information
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// needed to determine their references.
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std::deque<UnwrappedTl0Frame> stashed_frames_;
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// Where the current scalability structure is in the
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// `scalability_structures_` array.
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uint8_t current_ss_idx_ = 0;
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// Holds received scalability structures.
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std::array<GofInfoVP9, kMaxGofSaved> scalability_structures_;
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// Holds the the Gof information for a given unwrapped TL0 picture index.
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std::map<int64_t, GofInfo> gof_info_;
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// Keep track of which picture id and which temporal layer that had the
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// up switch flag set.
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std::map<uint16_t, uint8_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>
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up_switch_;
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// For every temporal layer, keep a set of which frames that are missing.
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std::array<std::set<uint16_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>,
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kMaxTemporalLayers>
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missing_frames_for_layer_;
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// Unwrapper used to unwrap VP8/VP9 streams which have their picture id
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// specified.
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SeqNumUnwrapper<uint16_t, kFrameIdLength> unwrapper_;
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SeqNumUnwrapper<uint8_t> tl0_unwrapper_;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_RTP_VP9_REF_FINDER_H_
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