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.

1 files changed, 6 insertions, 2 deletions

diff --git a/pkg/ttymididrv/out.go b/pkg/ttymididrv/out.go
index 3e16cff..4932190 100644
--- a/pkg/ttymididrv/out.go
+++ b/pkg/ttymididrv/out.go
@@ -1,6 +1,7 @@
 package ttymididrv
 
 import (
+	"fmt"
 	"sync"
 
 	"github.com/tarm/serial"
@@ -73,7 +74,10 @@ func (o *out) Underlying() interface{} {
 	return o.port
 }
 
-func (o *out) Send(b []byte) error {
+func (o *out) Write(b []byte) (int, error) {
 	_, err := o.port.Write(b)
-	return err
+	if err != nil {
+		return 0, fmt.Errorf("could not write to port: %w", err)
+	}
+	return len(b), nil
 }