rtp_vp8_ref_finder.h

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/*

 *  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_VP8_REF_FINDER_H_

#define MODULES_VIDEO_CODING_RTP_VP8_REF_FINDER_H_

#include <deque>

#include <map>

#include <memory>

#include <set>

#include "absl/container/inlined_vector.h"

#include "modules/rtp_rtcp/source/frame_object.h"

#include "modules/video_coding/rtp_frame_reference_finder.h"

#include "rtc_base/numerics/sequence_number_unwrapper.h"

namespace webrtc {

class RtpVp8RefFinder {

 public:

  RtpVp8RefFinder() = default;

  RtpFrameReferenceFinder::ReturnVector ManageFrame(

      std::unique_ptr<RtpFrameObject> frame);

  void ClearTo(uint16_t seq_num);

 private:

  static constexpr int kFrameIdLength = 1 << 15;

  static constexpr int kMaxLayerInfo = 50;

  static constexpr int kMaxNotYetReceivedFrames = 100;

  static constexpr int kMaxStashedFrames = 100;

  static constexpr int kMaxTemporalLayers = 5;

  struct UnwrappedTl0Frame {

    int64_t unwrapped_tl0;

    std::unique_ptr<RtpFrameObject> frame;

};

  enum FrameDecision { kStash, kHandOff, kDrop };

  FrameDecision ManageFrameInternal(RtpFrameObject* frame,

                                    const RTPVideoHeaderVP8& codec_header,

                                    int64_t unwrapped_tl0);

  void RetryStashedFrames(RtpFrameReferenceFinder::ReturnVector& res);

  void UpdateLayerInfoVp8(RtpFrameObject* frame,

                          int64_t unwrapped_tl0,

                          uint8_t temporal_idx);

  void UnwrapPictureIds(RtpFrameObject* frame);

  // Save the last picture id in order to detect when there is a gap in frames

  // that have not yet been fully received.

  int last_picture_id_ = -1;

  // Frames earlier than the last received frame that have not yet been

  // fully received.

  std::set<uint16_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>

      not_yet_received_frames_;

  // Frames that have been fully received but didn't have all the information

  // needed to determine their references.

  std::deque<UnwrappedTl0Frame> stashed_frames_;

  // Holds the information about the last completed frame for a given temporal

  // layer given an unwrapped Tl0 picture index.

  std::map<int64_t, std::array<int64_t, kMaxTemporalLayers>> layer_info_;

  // Unwrapper used to unwrap VP8/VP9 streams which have their picture id

  // specified.

  SeqNumUnwrapper<uint16_t, kFrameIdLength> unwrapper_;

  SeqNumUnwrapper<uint8_t> tl0_unwrapper_;

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_RTP_VP8_REF_FINDER_H_