From 2e012a6d9237e4cb285983ece2f467ed818bdce9 Mon Sep 17 00:00:00 2001
From: Terin Stock <terinjokes@gmail.com>
Date: Sat, 16 May 2020 16:01:56 -0700
Subject: feat(playsmf): support playback via rtmidi

Add support for playback via rtmidi to support debugging on devices
where a MIDI synthesizer is not connected via serial.
---
 cmd/playsmf/main.go | 77 ++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 53 insertions(+), 24 deletions(-)

(limited to 'cmd/playsmf/main.go')

diff --git a/cmd/playsmf/main.go b/cmd/playsmf/main.go
index 7b55ff3..ca9e105 100644
--- a/cmd/playsmf/main.go
+++ b/cmd/playsmf/main.go
@@ -5,37 +5,64 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"strings"
 	"time"
 
 	"gitlab.com/gomidi/midi"
-	"gitlab.com/gomidi/midi/mid"
 	"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        mid.Driver
+	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()
-	drv = ttymididrv.New(midiSerial, 38400)
-	defer drv.Close()
 
-	outs, err := drv.Outs()
-	if err != nil {
-		fmt.Printf("err: %v\n", err)
-		os.Exit(-1)
+	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]
 	}
-	out := outs[0]
+	defer drv.Close()
 
-	err = out.Open()
+	err := out.Open()
 	if err != nil {
 		fmt.Printf("err: %v\n", err)
 		os.Exit(-1)
@@ -56,24 +83,26 @@ func main() {
 
 	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)
+	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 := *mf.TimeAt(event.Value.(Event).abs)
+		dur := *reader.TimeAt(mf, event.Value.(Event).abs)
 		if lastDur != dur {
 			<-time.After(dur - lastDur)
 			lastDur = dur
-- 
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