added controls

examples/main.go

@@ -5,8 +5,8 @@ import (
 	//"encoding/hex"
 	"fmt"
 	"image"
+	"image/jpeg"
 	"os"
-	//"image/jpeg"
 	//"net/http"
 	"git.giftfish.de/ston1th/webcam"
 	"time"
@@ -22,6 +22,20 @@ func main() {
 	}
 	defer cam.Close()
 
+	ctrl := cam.GetControls()
+	for k, value := range ctrl {
+		fmt.Fprintln(os.Stderr, k)
+		for _, v := range value {
+			fmt.Fprintln(os.Stderr, "  "+v)
+		}
+	}
+
+	// https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/control.html#control-ids
+	err = cam.SetControl(webcam.V4L2_CID_CONTRAST, 0)
+	if err != nil {
+		panic(err.Error())
+	}
+
 	formats := cam.GetPixelFormats()
 	println("Available formats: ")
 	for k, value := range formats {
@@ -65,10 +79,13 @@ func main() {
 		default:
 			panic(err.Error())
 		}
-		frm, err := cam.ReadFrame()
+		//frm, err := cam.ReadFrame()
+		o := jpeg.Options{100}
+		img, err := cam.ReadJPEG()
+		jpeg.Encode(os.Stdout, img, &o)
 		if err == nil {
 			//print(".")
-			os.Stdout.Write(frm)
+			//os.Stdout.Write(frm)
 			os.Stdout.Sync()
 		}
 	}