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
|
package main
import (
"container/list"
"flag"
"fmt"
"os"
"strings"
"time"
"gitlab.com/gomidi/midi"
"gitlab.com/gomidi/midi/midimessage"
"gitlab.com/gomidi/midi/reader"
"gitlab.com/gomidi/midi/smf"
"gitlab.com/gomidi/midi/writer"
"gitlab.com/gomidi/rtmididrv"
"go.terinstock.com/midifi/pkg/ttymididrv"
)
var (
drv midi.Driver
rt string
midiSerial string
)
func init() {
flag.StringVar(&midiSerial, "com", "", "The serial port of the MIDI synth")
flag.StringVar(&rt, "rt", "", "Connect to client:port with rtmidi")
}
func main() {
flag.Parse()
var out midi.Out
if rt != "" {
rtdrv, err := rtmididrv.New()
if err != nil {
panic(err)
}
drv = rtdrv
outs, err := rtdrv.Outs()
if err != nil {
fmt.Printf("err: %v\n", err)
os.Exit(-1)
}
for _, _out := range outs {
if strings.Contains(_out.String(), rt) {
out = _out
break
}
}
} else {
drv = ttymididrv.New(midiSerial, 38400)
outs, err := drv.Outs()
if err != nil {
fmt.Printf("err: %v\n", err)
os.Exit(-1)
}
out = outs[0]
}
defer drv.Close()
err := out.Open()
if err != nil {
fmt.Printf("err: %v\n", err)
os.Exit(-1)
}
defer out.Close()
if flag.NArg() == 0 {
flag.Usage()
os.Exit(-1)
}
f, err := os.Open(flag.Arg(0))
if err != nil {
fmt.Println("unable to load SMF file")
os.Exit(-2)
}
defer f.Close()
fmt.Printf("file: %s\n", flag.Arg(0))
events := &list.List{}
mf := reader.New(
reader.NoLogger(),
reader.SMFHeader(func(header smf.Header) {
fmt.Printf("file format: %s\n", header.Format.String())
fmt.Printf("number of tracks: %d\n", header.NumTracks)
fmt.Printf("time format: %s\n", header.TimeFormat.String())
fmt.Println("===========")
}),
reader.Each(func(pos *reader.Position, msg midi.Message) {
addEvent(events, Event{track: pos.Track, abs: pos.AbsoluteTicks, msg: msg})
}),
)
reader.ReadSMF(mf, f)
w := writer.New(out)
var lastDur time.Duration
for event := events.Front(); event != nil; event = event.Next() {
dur := *reader.TimeAt(mf, event.Value.(Event).abs)
if lastDur != dur {
<-time.After(dur - lastDur)
lastDur = dur
}
msg := event.Value.(Event).msg
if midimessage.IsLive(msg) {
fmt.Printf("%s\n", msg.String())
w.Write(msg)
}
}
}
type Event struct {
track int16
abs uint64
msg midi.Message
}
func addEvent(l *list.List, evt Event) {
if l.Front() == nil {
l.PushBack(evt)
return
}
for cur := l.Front(); cur != nil; cur = cur.Next() {
peek := cur.Next()
if peek == nil {
l.InsertAfter(evt, cur)
return
}
if peek.Value.(Event).abs >= evt.abs {
l.InsertAfter(evt, cur)
return
}
}
}
|
