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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* Copyright (c) 2018 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_VIDEO_CODECS_VIDEO_CODEC_H_
#define API_VIDEO_CODECS_VIDEO_CODEC_H_
#include <stddef.h>
#include <stdint.h>
#include <string>
#include "absl/strings/string_view.h"
#include "api/video/video_bitrate_allocation.h"
#include "api/video/video_codec_type.h"
#include "api/video_codecs/scalability_mode.h"
#include "api/video_codecs/simulcast_stream.h"
#include "api/video_codecs/spatial_layer.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// The VideoCodec class represents an old defacto-apis, which we're migrating
// away from slowly.
// Video codec
enum class VideoCodecComplexity {
kComplexityLow = -1,
kComplexityNormal = 0,
kComplexityHigh = 1,
kComplexityHigher = 2,
kComplexityMax = 3
};
// VP8 specific
struct VideoCodecVP8 {
bool operator==(const VideoCodecVP8& other) const;
bool operator!=(const VideoCodecVP8& other) const {
return !(*this == other);
}
// Temporary utility method for transition deleting numberOfTemporalLayers
// setting (replaced by ScalabilityMode).
void SetNumberOfTemporalLayers(unsigned char n) {
numberOfTemporalLayers = n;
}
unsigned char numberOfTemporalLayers;
bool denoisingOn;
bool automaticResizeOn;
int keyFrameInterval;
};
enum class InterLayerPredMode : int {
kOff = 0, // Inter-layer prediction is disabled.
kOn = 1, // Inter-layer prediction is enabled.
kOnKeyPic = 2 // Inter-layer prediction is enabled but limited to key frames.
};
// VP9 specific.
struct VideoCodecVP9 {
bool operator==(const VideoCodecVP9& other) const;
bool operator!=(const VideoCodecVP9& other) const {
return !(*this == other);
}
// Temporary utility method for transition deleting numberOfTemporalLayers
// setting (replaced by ScalabilityMode).
void SetNumberOfTemporalLayers(unsigned char n) {
numberOfTemporalLayers = n;
}
unsigned char numberOfTemporalLayers;
bool denoisingOn;
int keyFrameInterval;
bool adaptiveQpMode;
bool automaticResizeOn;
unsigned char numberOfSpatialLayers;
bool flexibleMode;
InterLayerPredMode interLayerPred;
};
// H264 specific.
struct VideoCodecH264 {
bool operator==(const VideoCodecH264& other) const;
bool operator!=(const VideoCodecH264& other) const {
return !(*this == other);
}
// Temporary utility method for transition deleting numberOfTemporalLayers
// setting (replaced by ScalabilityMode).
void SetNumberOfTemporalLayers(unsigned char n) {
numberOfTemporalLayers = n;
}
int keyFrameInterval;
uint8_t numberOfTemporalLayers;
};
struct VideoCodecAV1 {
bool operator==(const VideoCodecAV1& other) const {
return automatic_resize_on == other.automatic_resize_on;
}
bool operator!=(const VideoCodecAV1& other) const {
return !(*this == other);
}
bool automatic_resize_on;
};
// Translates from name of codec to codec type and vice versa.
RTC_EXPORT const char* CodecTypeToPayloadString(VideoCodecType type);
RTC_EXPORT VideoCodecType PayloadStringToCodecType(const std::string& name);
union VideoCodecUnion {
VideoCodecVP8 VP8;
VideoCodecVP9 VP9;
VideoCodecH264 H264;
VideoCodecAV1 AV1;
};
enum class VideoCodecMode { kRealtimeVideo, kScreensharing };
// Common video codec properties
class RTC_EXPORT VideoCodec {
public:
VideoCodec();
// Scalability mode as described in
// https://www.w3.org/TR/webrtc-svc/#scalabilitymodes*
absl::optional<ScalabilityMode> GetScalabilityMode() const {
return scalability_mode_;
}
void SetScalabilityMode(ScalabilityMode scalability_mode) {
scalability_mode_ = scalability_mode;
}
void UnsetScalabilityMode() { scalability_mode_ = absl::nullopt; }
VideoCodecComplexity GetVideoEncoderComplexity() const;
void SetVideoEncoderComplexity(VideoCodecComplexity complexity_setting);
bool GetFrameDropEnabled() const;
void SetFrameDropEnabled(bool enabled);
bool IsSinglecast() const { return numberOfSimulcastStreams <= 1; }
bool IsSimulcast() const { return !IsSinglecast(); }
// Public variables. TODO(hta): Make them private with accessors.
VideoCodecType codecType;
// TODO(nisse): Change to int, for consistency.
uint16_t width;
uint16_t height;
unsigned int startBitrate; // kilobits/sec.
unsigned int maxBitrate; // kilobits/sec.
unsigned int minBitrate; // kilobits/sec.
uint32_t maxFramerate;
// This enables/disables encoding and sending when there aren't multiple
// simulcast streams,by allocating 0 bitrate if inactive.
bool active;
unsigned int qpMax;
// The actual number of simulcast streams. This is <= 1 in singlecast (it can
// be 0 in old code paths), but it is also 1 in the {active,inactive,inactive}
// "single RTP simulcast" use case and the legacy kSVC use case. In all other
// cases this is the same as the number of encodings (which may include
// inactive encodings). In other words:
// - `numberOfSimulcastStreams <= 1` in singlecast and singlecast-like setups
// including legacy kSVC (encodings interpreted as spatial layers) or
// standard kSVC (1 active encoding).
// - `numberOfSimulcastStreams > 1` in simulcast of 2+ active encodings.
unsigned char numberOfSimulcastStreams;
SimulcastStream simulcastStream[kMaxSimulcastStreams];
SpatialLayer spatialLayers[kMaxSpatialLayers];
VideoCodecMode mode;
bool expect_encode_from_texture;
// Timing frames configuration. There is delay of delay_ms between two
// consequent timing frames, excluding outliers. Frame is always made a
// timing frame if it's at least outlier_ratio in percent of "ideal" average
// frame given bitrate and framerate, i.e. if it's bigger than
// |outlier_ratio / 100.0 * bitrate_bps / fps| in bits. This way, timing
// frames will not be sent too often usually. Yet large frames will always
// have timing information for debug purposes because they are more likely to
// cause extra delays.
struct TimingFrameTriggerThresholds {
int64_t delay_ms;
uint16_t outlier_ratio_percent;
} timing_frame_thresholds;
// Legacy Google conference mode flag for simulcast screenshare
bool legacy_conference_mode;
bool operator==(const VideoCodec& other) const = delete;
bool operator!=(const VideoCodec& other) const = delete;
std::string ToString() const;
// Accessors for codec specific information.
// There is a const version of each that returns a reference,
// and a non-const version that returns a pointer, in order
// to allow modification of the parameters.
VideoCodecVP8* VP8();
const VideoCodecVP8& VP8() const;
VideoCodecVP9* VP9();
const VideoCodecVP9& VP9() const;
VideoCodecH264* H264();
const VideoCodecH264& H264() const;
VideoCodecAV1* AV1();
const VideoCodecAV1& AV1() const;
private:
// TODO(hta): Consider replacing the union with a pointer type.
// This will allow removing the VideoCodec* types from this file.
VideoCodecUnion codec_specific_;
absl::optional<ScalabilityMode> scalability_mode_;
// 'complexity_' indicates the CPU capability of the client. It's used to
// determine encoder CPU complexity (e.g., cpu_used for VP8, VP9. and AV1).
VideoCodecComplexity complexity_;
bool frame_drop_enabled_ = false;
};
} // namespace webrtc
#endif // API_VIDEO_CODECS_VIDEO_CODEC_H_
|
