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
147
148
|
/*
* 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 API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
#define API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
#include <stdint.h>
#include <initializer_list>
#include <memory>
#include <vector>
#include "absl/container/inlined_vector.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
namespace webrtc {
// Structures to build and parse dependency descriptor as described in
// https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension
class RenderResolution {
public:
constexpr RenderResolution() = default;
constexpr RenderResolution(int width, int height)
: width_(width), height_(height) {}
RenderResolution(const RenderResolution&) = default;
RenderResolution& operator=(const RenderResolution&) = default;
friend bool operator==(const RenderResolution& lhs,
const RenderResolution& rhs) {
return lhs.width_ == rhs.width_ && lhs.height_ == rhs.height_;
}
constexpr int Width() const { return width_; }
constexpr int Height() const { return height_; }
private:
int width_ = 0;
int height_ = 0;
};
// Relationship of a frame to a Decode target.
enum class DecodeTargetIndication {
kNotPresent = 0, // DecodeTargetInfo symbol '-'
kDiscardable = 1, // DecodeTargetInfo symbol 'D'
kSwitch = 2, // DecodeTargetInfo symbol 'S'
kRequired = 3 // DecodeTargetInfo symbol 'R'
};
struct FrameDependencyTemplate {
// Setters are named briefly to chain them when building the template.
FrameDependencyTemplate& S(int spatial_layer);
FrameDependencyTemplate& T(int temporal_layer);
FrameDependencyTemplate& Dtis(absl::string_view dtis);
FrameDependencyTemplate& FrameDiffs(std::initializer_list<int> diffs);
FrameDependencyTemplate& ChainDiffs(std::initializer_list<int> diffs);
friend bool operator==(const FrameDependencyTemplate& lhs,
const FrameDependencyTemplate& rhs) {
return lhs.spatial_id == rhs.spatial_id &&
lhs.temporal_id == rhs.temporal_id &&
lhs.decode_target_indications == rhs.decode_target_indications &&
lhs.frame_diffs == rhs.frame_diffs &&
lhs.chain_diffs == rhs.chain_diffs;
}
int spatial_id = 0;
int temporal_id = 0;
absl::InlinedVector<DecodeTargetIndication, 10> decode_target_indications;
absl::InlinedVector<int, 4> frame_diffs;
absl::InlinedVector<int, 4> chain_diffs;
};
struct FrameDependencyStructure {
friend bool operator==(const FrameDependencyStructure& lhs,
const FrameDependencyStructure& rhs) {
return lhs.num_decode_targets == rhs.num_decode_targets &&
lhs.num_chains == rhs.num_chains &&
lhs.decode_target_protected_by_chain ==
rhs.decode_target_protected_by_chain &&
lhs.resolutions == rhs.resolutions && lhs.templates == rhs.templates;
}
int structure_id = 0;
int num_decode_targets = 0;
int num_chains = 0;
// If chains are used (num_chains > 0), maps decode target index into index of
// the chain protecting that target.
absl::InlinedVector<int, 10> decode_target_protected_by_chain;
absl::InlinedVector<RenderResolution, 4> resolutions;
std::vector<FrameDependencyTemplate> templates;
};
struct DependencyDescriptor {
static constexpr int kMaxSpatialIds = 4;
static constexpr int kMaxTemporalIds = 8;
static constexpr int kMaxDecodeTargets = 32;
static constexpr int kMaxTemplates = 64;
bool first_packet_in_frame = true;
bool last_packet_in_frame = true;
int frame_number = 0;
FrameDependencyTemplate frame_dependencies;
absl::optional<RenderResolution> resolution;
absl::optional<uint32_t> active_decode_targets_bitmask;
std::unique_ptr<FrameDependencyStructure> attached_structure;
};
// Below are implementation details.
namespace webrtc_impl {
absl::InlinedVector<DecodeTargetIndication, 10> StringToDecodeTargetIndications(
absl::string_view indication_symbols);
} // namespace webrtc_impl
inline FrameDependencyTemplate& FrameDependencyTemplate::S(int spatial_layer) {
this->spatial_id = spatial_layer;
return *this;
}
inline FrameDependencyTemplate& FrameDependencyTemplate::T(int temporal_layer) {
this->temporal_id = temporal_layer;
return *this;
}
inline FrameDependencyTemplate& FrameDependencyTemplate::Dtis(
absl::string_view dtis) {
this->decode_target_indications =
webrtc_impl::StringToDecodeTargetIndications(dtis);
return *this;
}
inline FrameDependencyTemplate& FrameDependencyTemplate::FrameDiffs(
std::initializer_list<int> diffs) {
this->frame_diffs.assign(diffs.begin(), diffs.end());
return *this;
}
inline FrameDependencyTemplate& FrameDependencyTemplate::ChainDiffs(
std::initializer_list<int> diffs) {
this->chain_diffs.assign(diffs.begin(), diffs.end());
return *this;
}
} // namespace webrtc
#endif // API_TRANSPORT_RTP_DEPENDENCY_DESCRIPTOR_H_
|
