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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
// A complete frame is a frame which has received all its packets and all its
// references are known.
class OnCompleteFrameCallback {
public:
virtual ~OnCompleteFrameCallback() {}
virtual void OnCompleteFrame(std::unique_ptr<EncodedFrame> frame) = 0;
};
class RtpFrameReferenceFinder {
public:
using ReturnVector = absl::InlinedVector<std::unique_ptr<RtpFrameObject>, 3>;
explicit RtpFrameReferenceFinder(OnCompleteFrameCallback* frame_callback);
explicit RtpFrameReferenceFinder(OnCompleteFrameCallback* frame_callback,
int64_t picture_id_offset);
~RtpFrameReferenceFinder();
// Manage this frame until:
// - We have all information needed to determine its references, after
// which |frame_callback_| is called with the completed frame, or
// - We have too many stashed frames (determined by |kMaxStashedFrames|)
// so we drop this frame, or
// - It gets cleared by ClearTo, which also means we drop it.
void 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.
void PaddingReceived(uint16_t seq_num);
// Clear all stashed frames that include packets older than |seq_num|.
void ClearTo(uint16_t seq_num);
private:
void HandOffFrames(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_;
OnCompleteFrameCallback* frame_callback_;
std::unique_ptr<internal::RtpFrameReferenceFinderImpl> impl_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_RTP_FRAME_REFERENCE_FINDER_H_
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