| /* |
| * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef MODULES_VIDEO_CODING_RTP_SEQ_NUM_ONLY_REF_FINDER_H_ |
| #define MODULES_VIDEO_CODING_RTP_SEQ_NUM_ONLY_REF_FINDER_H_ |
| |
| #include <deque> |
| #include <map> |
| #include <memory> |
| #include <set> |
| #include <utility> |
| |
| #include "absl/container/inlined_vector.h" |
| #include "modules/video_coding/frame_object.h" |
| #include "modules/video_coding/rtp_frame_reference_finder.h" |
| #include "rtc_base/numerics/sequence_number_util.h" |
| |
| namespace webrtc { |
| |
| class RtpSeqNumOnlyRefFinder { |
| public: |
| RtpSeqNumOnlyRefFinder() = default; |
| |
| RtpFrameReferenceFinder::ReturnVector ManageFrame( |
| std::unique_ptr<RtpFrameObject> frame); |
| RtpFrameReferenceFinder::ReturnVector PaddingReceived(uint16_t seq_num); |
| void ClearTo(uint16_t seq_num); |
| |
| private: |
| static constexpr int kMaxStashedFrames = 100; |
| static constexpr int kMaxPaddingAge = 100; |
| |
| enum FrameDecision { kStash, kHandOff, kDrop }; |
| |
| FrameDecision ManageFrameInternal(RtpFrameObject* frame); |
| void RetryStashedFrames(RtpFrameReferenceFinder::ReturnVector& res); |
| void UpdateLastPictureIdWithPadding(uint16_t seq_num); |
| |
| // For every group of pictures, hold two sequence numbers. The first being |
| // the sequence number of the last packet of the last completed frame, and |
| // the second being the sequence number of the last packet of the last |
| // completed frame advanced by any potential continuous packets of padding. |
| std::map<uint16_t, |
| std::pair<uint16_t, uint16_t>, |
| DescendingSeqNumComp<uint16_t>> |
| last_seq_num_gop_; |
| |
| // Padding packets that have been received but that are not yet continuous |
| // with any group of pictures. |
| std::set<uint16_t, DescendingSeqNumComp<uint16_t>> stashed_padding_; |
| |
| // Frames that have been fully received but didn't have all the information |
| // needed to determine their references. |
| std::deque<std::unique_ptr<RtpFrameObject>> stashed_frames_; |
| |
| // Unwrapper used to unwrap generic RTP streams. In a generic stream we derive |
| // a picture id from the packet sequence number. |
| SeqNumUnwrapper<uint16_t> rtp_seq_num_unwrapper_; |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // MODULES_VIDEO_CODING_RTP_SEQ_NUM_ONLY_REF_FINDER_H_ |