diff options
Diffstat (limited to 'cmd/playsmf/main.go')
-rw-r--r-- | cmd/playsmf/main.go | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/cmd/playsmf/main.go b/cmd/playsmf/main.go new file mode 100644 index 0000000..7b55ff3 --- /dev/null +++ b/cmd/playsmf/main.go @@ -0,0 +1,114 @@ +package main + +import ( + "container/list" + "flag" + "fmt" + "os" + "time" + + "gitlab.com/gomidi/midi" + "gitlab.com/gomidi/midi/mid" + "gitlab.com/gomidi/midi/midimessage" + "gitlab.com/gomidi/midi/smf" + "go.terinstock.com/midifi/pkg/ttymididrv" +) + +var ( + drv mid.Driver + midiSerial string +) + +func init() { + flag.StringVar(&midiSerial, "com", "", "The serial port of the MIDI synth") +} + +func main() { + flag.Parse() + drv = ttymididrv.New(midiSerial, 38400) + defer drv.Close() + + outs, err := drv.Outs() + if err != nil { + fmt.Printf("err: %v\n", err) + os.Exit(-1) + } + out := outs[0] + + 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)) + + mf := mid.NewReader(mid.NoLogger()) + mf.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("===========") + } + events := &list.List{} + mf.Msg.Each = func(pos *mid.Position, msg midi.Message) { + addEvent(events, Event{track: pos.Track, abs: pos.AbsoluteTicks, msg: msg}) + } + mf.ReadSMF(f) + + w := mid.WriteTo(out) + + var lastDur time.Duration + for event := events.Front(); event != nil; event = event.Next() { + dur := *mf.TimeAt(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 + } + } +} |