1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* 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_VP9_REF_FINDER_H_
#define MODULES_VIDEO_CODING_RTP_VP9_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 RtpVp9RefFinder {
public:
RtpVp9RefFinder() = 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 kMaxGofSaved = 50;
static constexpr int kMaxLayerInfo = 50;
static constexpr int kMaxNotYetReceivedFrames = 100;
static constexpr int kMaxStashedFrames = 100;
static constexpr int kMaxTemporalLayers = 5;
enum FrameDecision { kStash, kHandOff, kDrop };
struct GofInfo {
GofInfo(GofInfoVP9* gof, uint16_t last_picture_id)
: gof(gof), last_picture_id(last_picture_id) {}
GofInfoVP9* gof;
uint16_t last_picture_id;
};
struct UnwrappedTl0Frame {
int64_t unwrapped_tl0;
std::unique_ptr<RtpFrameObject> frame;
};
FrameDecision ManageFrameFlexible(RtpFrameObject* frame,
const RTPVideoHeaderVP9& vp9_header);
FrameDecision ManageFrameGof(RtpFrameObject* frame,
const RTPVideoHeaderVP9& vp9_header,
int64_t unwrapped_tl0);
void RetryStashedFrames(RtpFrameReferenceFinder::ReturnVector& res);
bool MissingRequiredFrameVp9(uint16_t picture_id, const GofInfo& info);
void FrameReceivedVp9(uint16_t picture_id, GofInfo* info);
bool UpSwitchInIntervalVp9(uint16_t picture_id,
uint8_t temporal_idx,
uint16_t pid_ref);
void FlattenFrameIdAndRefs(RtpFrameObject* frame, bool inter_layer_predicted);
// Frames that have been fully received but didn't have all the information
// needed to determine their references.
std::deque<UnwrappedTl0Frame> stashed_frames_;
// Where the current scalability structure is in the
// `scalability_structures_` array.
uint8_t current_ss_idx_ = 0;
// Holds received scalability structures.
std::array<GofInfoVP9, kMaxGofSaved> scalability_structures_;
// Holds the the Gof information for a given unwrapped TL0 picture index.
std::map<int64_t, GofInfo> gof_info_;
// Keep track of which picture id and which temporal layer that had the
// up switch flag set.
std::map<uint16_t, uint8_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>
up_switch_;
// For every temporal layer, keep a set of which frames that are missing.
std::array<std::set<uint16_t, DescendingSeqNumComp<uint16_t, kFrameIdLength>>,
kMaxTemporalLayers>
missing_frames_for_layer_;
// 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_VP9_REF_FINDER_H_
|
