-
Notifications
You must be signed in to change notification settings - Fork 11
/
playlistItem.go
214 lines (188 loc) · 5.47 KB
/
playlistItem.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
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
package m3u8
import (
"fmt"
"strconv"
"strings"
)
// PlaylistItem represents a set of EXT-X-STREAM-INF or
// EXT-X-I-FRAME-STREAM-INF attributes
type PlaylistItem struct {
Bandwidth int
URI string
IFrame bool
Name *string
Width *int
Height *int
AverageBandwidth *int
ProgramID *string
Codecs *string
AudioCodec *string
Profile *string
Level *string
Video *string
Audio *string
Subtitles *string
ClosedCaptions *string
FrameRate *float64
HDCPLevel *string
Resolution *Resolution
StableVariantID *string
}
// NewPlaylistItem parses a text line and returns a *PlaylistItem
func NewPlaylistItem(text string) (*PlaylistItem, error) {
attributes := ParseAttributes(text)
resolution, err := parseResolution(attributes, ResolutionTag)
if err != nil {
return nil, err
}
var width, height *int
if resolution != nil {
width = &resolution.Width
height = &resolution.Height
}
averageBandwidth, err := parseInt(attributes, AverageBandwidthTag)
if err != nil {
return nil, err
}
frameRate, err := parseFloat(attributes, FrameRateTag)
if err != nil {
return nil, err
}
if frameRate != nil && *frameRate <= 0 {
frameRate = nil
}
bandwidth, err := parseBandwidth(attributes, BandwidthTag)
if err != nil {
return nil, err
}
return &PlaylistItem{
ProgramID: pointerTo(attributes, ProgramIDTag),
Codecs: pointerTo(attributes, CodecsTag),
Width: width,
Height: height,
Bandwidth: bandwidth,
AverageBandwidth: averageBandwidth,
FrameRate: frameRate,
Video: pointerTo(attributes, VideoTag),
Audio: pointerTo(attributes, AudioTag),
URI: attributes[URITag],
Subtitles: pointerTo(attributes, SubtitlesTag),
ClosedCaptions: pointerTo(attributes, ClosedCaptionsTag),
Name: pointerTo(attributes, NameTag),
HDCPLevel: pointerTo(attributes, HDCPLevelTag),
Resolution: resolution,
StableVariantID: pointerTo(attributes, StableVariantIDTag),
}, nil
}
func (pi *PlaylistItem) String() string {
var slice []string
// Check resolution
if pi.Resolution == nil && pi.Width != nil && pi.Height != nil {
r := &Resolution{
Width: *pi.Width,
Height: *pi.Height,
}
pi.Resolution = r
}
if pi.ProgramID != nil {
slice = append(slice, fmt.Sprintf(formatString, ProgramIDTag, *pi.ProgramID))
}
if pi.Resolution != nil {
slice = append(slice, fmt.Sprintf(formatString, ResolutionTag, pi.Resolution.String()))
}
codecs := formatCodecs(pi)
if codecs != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, CodecsTag, *codecs))
}
slice = append(slice, fmt.Sprintf(formatString, BandwidthTag, pi.Bandwidth))
if pi.AverageBandwidth != nil {
slice = append(slice, fmt.Sprintf(formatString, AverageBandwidthTag, *pi.AverageBandwidth))
}
if pi.FrameRate != nil {
slice = append(slice, fmt.Sprintf(frameRateFormatString, FrameRateTag, *pi.FrameRate))
}
if pi.HDCPLevel != nil {
slice = append(slice, fmt.Sprintf(formatString, HDCPLevelTag, *pi.HDCPLevel))
}
if pi.Audio != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, AudioTag, *pi.Audio))
}
if pi.Video != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, VideoTag, *pi.Video))
}
if pi.Subtitles != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, SubtitlesTag, *pi.Subtitles))
}
if pi.ClosedCaptions != nil {
cc := *pi.ClosedCaptions
fs := quotedFormatString
if cc == NoneValue {
fs = formatString
}
slice = append(slice, fmt.Sprintf(fs, ClosedCaptionsTag, cc))
}
if pi.Name != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, NameTag, *pi.Name))
}
if pi.StableVariantID != nil {
slice = append(slice, fmt.Sprintf(quotedFormatString, StableVariantIDTag, *pi.StableVariantID))
}
attributesString := strings.Join(slice, ",")
if pi.IFrame {
return fmt.Sprintf(`%s:%s,%s="%s"`, PlaylistIframeTag, attributesString, URITag, pi.URI)
}
return fmt.Sprintf("%s:%s\n%s", PlaylistItemTag, attributesString, pi.URI)
}
// CodecsString returns the string representation of codecs for a playlist item
func (pi *PlaylistItem) CodecsString() string {
codecsPtr := formatCodecs(pi)
if codecsPtr == nil {
return ""
}
return *codecsPtr
}
func formatCodecs(pi *PlaylistItem) *string {
if pi.Codecs != nil {
return pi.Codecs
}
videoCodecPtr := videoCodec(pi.Profile, pi.Level)
// profile or level were specified but not recognized any codecs
if !(pi.Profile == nil && pi.Level == nil) && videoCodecPtr == nil {
return nil
}
audioCodecPtr := audioCodec(pi.AudioCodec)
// audio codec was specified but not recognized
if !(pi.AudioCodec == nil) && audioCodecPtr == nil {
return nil
}
var slice []string
if videoCodecPtr != nil {
slice = append(slice, *videoCodecPtr)
}
if audioCodecPtr != nil {
slice = append(slice, *audioCodecPtr)
}
if len(slice) <= 0 {
return nil
}
value := strings.Join(slice, ",")
return &value
}
func parseBandwidth(attributes map[string]string, key string) (int, error) {
bw, ok := attributes[key]
if !ok {
return 0, ErrBandwidthMissing
}
bandwidth, err := strconv.ParseInt(bw, 0, 0)
if err != nil {
return 0, ErrBandwidthInvalid
}
return int(bandwidth), nil
}
func parseResolution(attributes map[string]string, key string) (*Resolution, error) {
resolution, ok := attributes[key]
if !ok {
return nil, nil
}
return NewResolution(resolution)
}