Add option to set jpeg quality level. Closes #371

conf/configuration.go

@@ -34,6 +34,7 @@ type nd struct {
 	ProbeCommand            string `default:"ffmpeg %s -f ffmetadata"`
 
 	CoverArtPriority string `default:"embedded, cover.*, folder.*, front.*"`
+	CoverJpegQuality int    `default:"75"`
 
 	// DevFlags. These are used to enable/disable debugging and incomplete features
 	DevLogSourceLine           bool   `default:"false"`

engine/cover.go

@@ -163,7 +163,7 @@ func resizeImage(reader io.Reader, size int) ([]byte, error) {
 	}
 	m := imaging.Resize(img, size, size, imaging.Lanczos)
 	buf := new(bytes.Buffer)
-	err = jpeg.Encode(buf, m, &jpeg.Options{Quality: 75})
+	err = jpeg.Encode(buf, m, &jpeg.Options{Quality: conf.Server.CoverJpegQuality})
 	return buf.Bytes(), err
 }