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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 2021 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_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
#define MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
#include <bitset>
#include <vector>
#include "api/transport/rtp/dependency_descriptor.h"
#include "api/video/video_bitrate_allocation.h"
#include "common_video/generic_frame_descriptor/generic_frame_info.h"
#include "modules/video_coding/svc/scalable_video_controller.h"
namespace webrtc {
// Scalability structure with multiple independent spatial layers each with the
// same temporal layering.
class ScalabilityStructureSimulcast : public ScalableVideoController {
public:
struct ScalingFactor {
int num = 1;
int den = 2;
};
ScalabilityStructureSimulcast(int num_spatial_layers,
int num_temporal_layers,
ScalingFactor resolution_factor);
~ScalabilityStructureSimulcast() override;
StreamLayersConfig StreamConfig() const override;
std::vector<LayerFrameConfig> NextFrameConfig(bool restart) override;
GenericFrameInfo OnEncodeDone(const LayerFrameConfig& config) override;
void OnRatesUpdated(const VideoBitrateAllocation& bitrates) override;
private:
enum FramePattern {
kNone,
kDeltaT2A,
kDeltaT1,
kDeltaT2B,
kDeltaT0,
};
static constexpr int kMaxNumSpatialLayers = 3;
static constexpr int kMaxNumTemporalLayers = 3;
// Index of the buffer to store last frame for layer (`sid`, `tid`)
int BufferIndex(int sid, int tid) const {
return tid * num_spatial_layers_ + sid;
}
bool DecodeTargetIsActive(int sid, int tid) const {
return active_decode_targets_[sid * num_temporal_layers_ + tid];
}
void SetDecodeTargetIsActive(int sid, int tid, bool value) {
active_decode_targets_.set(sid * num_temporal_layers_ + tid, value);
}
FramePattern NextPattern() const;
bool TemporalLayerIsActive(int tid) const;
const int num_spatial_layers_;
const int num_temporal_layers_;
const ScalingFactor resolution_factor_;
FramePattern last_pattern_ = kNone;
std::bitset<kMaxNumSpatialLayers> can_reference_t0_frame_for_spatial_id_ = 0;
std::bitset<kMaxNumSpatialLayers> can_reference_t1_frame_for_spatial_id_ = 0;
std::bitset<32> active_decode_targets_;
};
// S1 0--0--0-
// ...
// S0 0--0--0-
class ScalabilityStructureS2T1 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS2T1(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(2, 1, resolution_factor) {}
~ScalabilityStructureS2T1() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
class ScalabilityStructureS2T2 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS2T2(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(2, 2, resolution_factor) {}
~ScalabilityStructureS2T2() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
// S1T2 3 7
// | /
// S1T1 / 5
// |_/
// S1T0 1-------9...
//
// S0T2 2 6
// | /
// S0T1 / 4
// |_/
// S0T0 0-------8...
// Time-> 0 1 2 3 4
class ScalabilityStructureS2T3 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS2T3(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(2, 3, resolution_factor) {}
~ScalabilityStructureS2T3() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
class ScalabilityStructureS3T1 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS3T1(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(3, 1, resolution_factor) {}
~ScalabilityStructureS3T1() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
class ScalabilityStructureS3T2 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS3T2(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(3, 2, resolution_factor) {}
~ScalabilityStructureS3T2() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
class ScalabilityStructureS3T3 : public ScalabilityStructureSimulcast {
public:
explicit ScalabilityStructureS3T3(ScalingFactor resolution_factor = {})
: ScalabilityStructureSimulcast(3, 3, resolution_factor) {}
~ScalabilityStructureS3T3() override = default;
FrameDependencyStructure DependencyStructure() const override;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
|
