-
Notifications
You must be signed in to change notification settings - Fork 183
/
opus.go
139 lines (114 loc) · 3 KB
/
opus.go
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
package formats
import (
"fmt"
"strconv"
"strings"
"github.com/pion/rtp"
"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpsimpleaudio"
)
// Opus is a RTP format for the Opus codec.
// Specification: https://datatracker.ietf.org/doc/html/rfc7587
type Opus struct {
PayloadTyp uint8
IsStereo bool
}
func (f *Opus) unmarshal(ctx *unmarshalContext) error {
f.PayloadTyp = ctx.payloadType
tmp := strings.SplitN(ctx.clock, "/", 2)
if len(tmp) != 2 {
return fmt.Errorf("invalid clock (%v)", ctx.clock)
}
sampleRate, err := strconv.ParseUint(tmp[0], 10, 31)
if err != nil || sampleRate != 48000 {
return fmt.Errorf("invalid sample rate: %d", sampleRate)
}
channelCount, err := strconv.ParseUint(tmp[1], 10, 31)
if err != nil || channelCount != 2 {
return fmt.Errorf("invalid channel count: %d", channelCount)
}
for key, val := range ctx.fmtp {
if key == "sprop-stereo" {
f.IsStereo = (val == "1")
}
}
return nil
}
// Codec implements Format.
func (f *Opus) Codec() string {
return "Opus"
}
// String implements Format.
//
// Deprecated: replaced by Codec().
func (f *Opus) String() string {
return f.Codec()
}
// ClockRate implements Format.
func (f *Opus) ClockRate() int {
// RFC7587: the RTP timestamp is incremented with a 48000 Hz
// clock rate for all modes of Opus and all sampling rates.
return 48000
}
// PayloadType implements Format.
func (f *Opus) PayloadType() uint8 {
return f.PayloadTyp
}
// RTPMap implements Format.
func (f *Opus) RTPMap() string {
// RFC7587: The RTP clock rate in "a=rtpmap" MUST be 48000, and the
// number of channels MUST be 2.
return "opus/48000/2"
}
// FMTP implements Format.
func (f *Opus) FMTP() map[string]string {
fmtp := map[string]string{
"sprop-stereo": func() string {
if f.IsStereo {
return "1"
}
return "0"
}(),
}
return fmtp
}
// PTSEqualsDTS implements Format.
func (f *Opus) PTSEqualsDTS(*rtp.Packet) bool {
return true
}
// CreateDecoder creates a decoder able to decode the content of the format.
//
// Deprecated: this has been replaced by CreateDecoder2() that can also return an error.
func (f *Opus) CreateDecoder() *rtpsimpleaudio.Decoder {
d, _ := f.CreateDecoder2()
return d
}
// CreateDecoder2 creates a decoder able to decode the content of the format.
func (f *Opus) CreateDecoder2() (*rtpsimpleaudio.Decoder, error) {
d := &rtpsimpleaudio.Decoder{
SampleRate: 48000,
}
err := d.Init()
if err != nil {
return nil, err
}
return d, nil
}
// CreateEncoder creates an encoder able to encode the content of the format.
//
// Deprecated: this has been replaced by CreateEncoder2() that can also return an error.
func (f *Opus) CreateEncoder() *rtpsimpleaudio.Encoder {
e, _ := f.CreateEncoder2()
return e
}
// CreateEncoder2 creates an encoder able to encode the content of the format.
func (f *Opus) CreateEncoder2() (*rtpsimpleaudio.Encoder, error) {
e := &rtpsimpleaudio.Encoder{
PayloadType: f.PayloadTyp,
SampleRate: 48000,
}
err := e.Init()
if err != nil {
return nil, err
}
return e, nil
}