Initial commit

.gitignore

@@ -13,3 +13,5 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+*.mp3

cmd/main.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"time"
+
+	marlinbox "github.com/itsscb/marlin-box"
+)
+
+func main() {
+	mb := marlinbox.New("playlist.json")
+	mb.Run()
+	time.Sleep(time.Minute * 5)
+}

cmd/playlist.json

@@ -0,0 +1,28 @@
+{ 
+"devicename":"Sycreader RFID Technology Co., Ltd SYC ID&IC USB Reader", 
+"volume": 1.0,   
+"playlist": [
+        {
+            "id": "0002693373",
+            "file": "./music/ACDC - Back In Black.mp3"
+        },
+        {
+            "id": "0011415256",
+            "file": "./music/ACDC - TNT.mp3"
+        },
+        {
+            "id": "0011394336",
+            "file": "./music/ACDC - Thunderstruck.mp3"
+        }
+    ],
+"controlcards": [
+        {
+            "id": "0011462127",
+            "function": "vol+"
+        },
+        {
+            "id": "0011394129",
+            "function": "vol-"
+        }
+    ]
+}

go.mod

@@ -0,0 +1,11 @@
+module marlinbox
+
+go 1.18
+
+require (
+	github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6
+	github.com/hajimehoshi/go-mp3 v0.3.4
+	github.com/hajimehoshi/oto/v2 v2.3.1
+)
+
+require golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e // indirect

go.sum

@@ -0,0 +1,8 @@
+github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6 h1:K9b8efT9f1NkITNgNAm2A1LuoamhG4pAhXVjz5Sfa5Q=
+github.com/gvalkov/golang-evdev v0.0.0-20220815104727-7e27d6ce89b6/go.mod h1:SAzVFKCRezozJTGavF3GX8MBUruETCqzivVLYiywouA=
+github.com/hajimehoshi/go-mp3 v0.3.4 h1:NUP7pBYH8OguP4diaTZ9wJbUbk3tC0KlfzsEpWmYj68=
+github.com/hajimehoshi/go-mp3 v0.3.4/go.mod h1:fRtZraRFcWb0pu7ok0LqyFhCUrPeMsGRSVop0eemFmo=
+github.com/hajimehoshi/oto/v2 v2.3.1 h1:qrLKpNus2UfD674oxckKjNJmesp9hMh7u7QCrStB3Rc=
+github.com/hajimehoshi/oto/v2 v2.3.1/go.mod h1:seWLbgHH7AyUMYKfKYT9pg7PhUu9/SisyJvNTT+ASQo=
+golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e h1:NHvCuwuS43lGnYhten69ZWqi2QOj/CiDNcKbVqwVoew=
+golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

marlinbox.go

@@ -0,0 +1,215 @@
+package marlinbox
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	evdev "github.com/gvalkov/golang-evdev"
+	"github.com/hajimehoshi/go-mp3"
+	"github.com/hajimehoshi/oto/v2"
+)
+
+type MarlinBox struct {
+	DeviceName      string `json:"devicename"`
+	DevicePath      string `json:"devicepath,omitempty"`
+	CurrentID       string
+	Volume          float64        `json:"volume,omitempty"`
+	Playlist        []*PlayCard    `json:"playlist,omitempty"`
+	ControlCards    []*ControlCard `json:"controlcards,omitempty"`
+	Device          *evdev.InputDevice
+	CurrentPlayCard *PlayCard
+	Player          oto.Player
+	PlayerContext   *oto.Context
+}
+
+type RFIDCard struct {
+	ID string `json:"id"`
+}
+
+type PlayCard struct {
+	RFIDCard
+	File string `json:"file,omitempty"`
+}
+type ControlCard struct {
+	RFIDCard
+	Function string `json:"function,omitempty"`
+}
+
+var KeyMap = map[uint16]string{
+	2:  "1",
+	3:  "2",
+	4:  "3",
+	5:  "4",
+	6:  "5",
+	7:  "6",
+	8:  "7",
+	9:  "8",
+	10: "9",
+	11: "0",
+	28: "ENTER",
+}
+
+func New(path string) *MarlinBox {
+	var mb *MarlinBox
+
+	f, err := os.ReadFile(path)
+	if err != nil {
+		panic(err)
+	}
+
+	err = json.Unmarshal(f, &mb)
+	if err != nil {
+		panic(err)
+	}
+
+	if mb.Volume == 0 {
+		mb.Volume = 1
+	}
+
+	if mb.DeviceName == "" {
+		panic("No DeviceName given")
+	}
+
+	devices, err := evdev.ListInputDevices()
+
+	for _, dev := range devices {
+		if dev.Name == mb.DeviceName {
+			mb.DevicePath = dev.Fn
+		}
+	}
+
+	if mb.DevicePath == "" {
+		panic("Device not found")
+	}
+
+	return mb
+}
+
+func (mb *MarlinBox) Run() {
+	var err error
+	mb.Device, err = evdev.Open(mb.DevicePath)
+	if err != nil {
+		panic(err)
+	}
+	mb.Device.Grab()
+
+	go func() {
+		for {
+			events, err := mb.Device.Read()
+			if err != nil {
+				log.Println(err)
+			}
+
+			for _, ev := range events {
+				if ev.Value != 0x1 {
+					continue
+				}
+				val, ok := KeyMap[ev.Code]
+				if !ok {
+					continue
+				}
+
+				if val == "ENTER" {
+					err := mb.GetCurrentCard()
+					if err != nil {
+						log.Println(err)
+					}
+					fmt.Println(mb.CurrentPlayCard)
+					mb.CurrentID = ""
+					// err =
+					// if err != nil {
+					// 	log.Println(err)
+					// 	panic(err)
+					// }
+					continue
+				}
+
+				mb.CurrentID += val
+			}
+		}
+	}()
+}
+
+func (mb *MarlinBox) GetCurrentCard() error {
+	fmt.Println(mb.ControlCards)
+	for _, c := range mb.ControlCards {
+		if mb.CurrentID == c.ID {
+			switch c.Function {
+			case "vol+":
+				fmt.Println("vol+")
+				if mb.Volume < 1.0 {
+					mb.Volume = mb.Volume + 0.2
+				}
+			case "vol-":
+				fmt.Println("vol-")
+				if mb.Volume > 0 {
+					mb.Volume = mb.Volume - 0.2
+				}
+			default:
+				return nil
+			}
+			return nil
+		}
+	}
+	for _, c := range mb.Playlist {
+		if mb.CurrentID == c.ID {
+			mb.CurrentPlayCard = c
+			if mb.PlayerContext != nil {
+				mb.Player.Reset()
+			}
+			mb.Play()
+			return nil
+		}
+	}
+	return errors.New("Card not found: " + mb.CurrentID)
+}
+
+func (mb *MarlinBox) Play() {
+	go func() {
+		var err error
+		var ready chan struct{}
+		playingID := mb.CurrentPlayCard.ID
+		f, err := os.Open(mb.CurrentPlayCard.File)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+		defer f.Close()
+
+		d, err := mp3.NewDecoder(f)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+
+		mb.PlayerContext, ready, err = oto.NewContext(d.SampleRate(), 2, 2)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+		<-ready
+
+		mb.Player = mb.PlayerContext.NewPlayer(d)
+		defer mb.Player.Close()
+		mb.Player.SetVolume(mb.Volume)
+		mb.Player.Play()
+
+		for {
+			if mb.CurrentPlayCard.ID != playingID {
+				break
+			}
+			if mb.Volume != mb.Player.Volume() {
+				mb.Player.SetVolume(mb.Volume)
+			}
+			time.Sleep(time.Second)
+			if !mb.Player.IsPlaying() {
+				break
+			}
+		}
+	}()
+
+}