From c15057eac1c944ab382141b94d6f49e5cf32246a Mon Sep 17 00:00:00 2001
From: TonyChyi <tonychee1989@gmail.com>
Date: Mon, 19 Mar 2018 12:40:34 +0800
Subject: [PATCH] f

---
 backend/midiDevice_darwin.go | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 backend/midiDevice_darwin.go

diff --git a/backend/midiDevice_darwin.go b/backend/midiDevice_darwin.go
new file mode 100644
index 0000000..cfbd7da
--- /dev/null
+++ b/backend/midiDevice_darwin.go
@@ -0,0 +1,50 @@
+package backend
+
+import (
+	"github.com/tonychee7000/Arremi/consts"
+	midi "github.com/youpy/go-coremidi"
+)
+
+// MIDIDevice implies a Writer interface.
+type MIDIDevice struct {
+	client midi.Client
+	source midi.Source
+	Signal chan midi.Packet
+}
+
+// NewMIDIDevice construction func
+func NewMIDIDevice() (*MIDIDevice, error) {
+	var mididev = new(MIDIDevice)
+	err := mididev.Init()
+	return mididev, err
+}
+
+// Init the client and source
+func (midiDev *MIDIDevice) Init() error {
+	var err error
+
+	midiDev.Signal = make(chan midi.Packet, 4096)
+	midiDev.client, err = midi.NewClient(consts.ClientName)
+	if err != nil {
+		return err
+	}
+
+	midiDev.source, err = midi.NewSource(midiDev.client, consts.SourceName)
+	return err
+}
+
+func (midiDev *MIDIDevice) Write(p []byte) (int, error) {
+	var pack = midi.NewPacket(p, 0)
+	midiDev.Signal <- pack
+	err := pack.Received(&(midiDev.source))
+	return len(p), err
+}
+
+// AllNoteOff I don't want panic!
+func (midiDev *MIDIDevice) AllNoteOff() {
+	for i := 0; i < 16; i++ {
+		for j := 0; j < 128; j++ {
+			midiDev.Write([]byte{byte(0x90 + i), byte(j), 0})
+		}
+	}
+}