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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_
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