initial commit

examples/wled.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"log/slog"
+	"net"
+
+	"github.com/jwetzell/ddp-go"
+)
+
+// receive data from WLED virtual output
+func main() {
+	addr, err := net.ResolveUDPAddr("udp", "0.0.0.0:4048")
+	if err != nil {
+		slog.Error("error making UDP address", "err", err)
+		return
+	}
+
+	client, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		slog.Error("error listening to UDP", "err", err)
+		return
+	}
+	defer client.Close()
+
+	for {
+		buffer := make([]byte, 2048)
+
+		length, _, err := client.ReadFromUDP(buffer)
+		if err != nil {
+			slog.Error("error reading from UDP", "err", err)
+		} else if length > 0 {
+			message, err := ddp.Decode(buffer[0:length])
+			if err != nil {
+				slog.Error("error decoding", "err", err)
+			}
+			ledCount := uint32(message.Header.DataLength) / uint32(message.Header.DataType.BitsPerPixel/8) / 3
+
+			for i := 0; i < int(ledCount); i++ {
+				ledOffset := i * 3
+				ledR := message.Data[ledOffset+0]
+				ledG := message.Data[ledOffset+1]
+				ledB := message.Data[ledOffset+2]
+
+				fmt.Printf("led %d:\tr=%d\tg=%d\tb=%d\n", i, ledR, ledG, ledB)
+			}
+		}
+	}
+}