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/*
* Copyright (c) 2016 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_FRAME_REFERENCE_FINDER_H_
#define MODULES_VIDEO_CODING_RTP_FRAME_REFERENCE_FINDER_H_
#include <memory>
#include "modules/video_coding/frame_object.h"
namespace webrtc {
namespace internal {
class RtpFrameReferenceFinderImpl;
} // namespace internal
class RtpFrameReferenceFinder {
public:
using ReturnVector = absl::InlinedVector<std::unique_ptr<RtpFrameObject>, 3>;
RtpFrameReferenceFinder();
explicit RtpFrameReferenceFinder(int64_t picture_id_offset);
~RtpFrameReferenceFinder();
// The RtpFrameReferenceFinder will hold onto the frame until:
// - the required information to determine its references has been received,
// in which case it (and possibly other) frames are returned, or
// - There are too many stashed frames (determined by `kMaxStashedFrames`),
// in which case it gets dropped, or
// - It gets cleared by ClearTo, in which case its dropped.
// - The frame is old, in which case it also gets dropped.
ReturnVector ManageFrame(std::unique_ptr<RtpFrameObject> frame);
// Notifies that padding has been received, which the reference finder
// might need to calculate the references of a frame.
ReturnVector PaddingReceived(uint16_t seq_num);
// Clear all stashed frames that include packets older than `seq_num`.
void ClearTo(uint16_t seq_num);
private:
void AddPictureIdOffset(ReturnVector& frames);
// How far frames have been cleared out of the buffer by RTP sequence number.
// A frame will be cleared if it contains a packet with a sequence number
// older than `cleared_to_seq_num_`.
int cleared_to_seq_num_ = -1;
const int64_t picture_id_offset_;
std::unique_ptr<internal::RtpFrameReferenceFinderImpl> impl_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_RTP_FRAME_REFERENCE_FINDER_H_
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