tc-audio-scan: FOLDER parameter and usage()

.scripts/tc-audio-scan

@@ -1,25 +1,46 @@
 #!/bin/sh
 
-if ! command -v mediainfo >/dev/null 2>&1; then
-	echo "mediainfo required."
+_usage() {
+	cat<<EOF
+Usage: ${0##*/} FOLDERS
+
+Print audio files found in FOLDERS with
+- constant bitrate;
+- embedded covers;
+- leading zeros in tags.
+EOF
+}
+
+if [ $# -eq 0 ] || [ "$1" = "-h" ]; then
+	_usage
 	exit
 fi
 
-## This will check for badly encoded audio.
-while IFS= read -r i; do
-	BUFFER="$(mediainfo "$i")"
-	[ -n "$(echo "$BUFFER" | grep "Bit rate mode *: Constant")" ] && echo "$i : CBR"
+if ! command -v mediainfo >/dev/null 2>&1; then
+	echo >&2 "mediainfo required."
+	exit 1
+fi
 
-	[ -n "$(echo "$BUFFER" | grep "Cover *: Yes")" ] && echo "$i : Cover"
+for j; do
+	while IFS= read -r i; do
+		BUFFER="$(mediainfo "$i")"
+		[ -n "$(echo "$BUFFER" | grep "Bit rate mode *: Constant")" ] && echo "$i : CBR"
 
-	[ -n "$(echo "$BUFFER" | grep "Track name/Position *: 0+")" ] && echo "$i : Leading zeros"
-done <<EOF
-$(find "."  \( \
+		[ -n "$(echo "$BUFFER" | grep "Cover *: Yes")" ] && echo "$i : Cover"
+
+		[ -n "$(echo "$BUFFER" | grep "Track name/Position *: 0+")" ] && echo "$i : Leading zeros"
+	done <<EOF
+$(find "$j"  \( \
 		-iname '*.mp3'  -o \
 		-iname '*.flac' -o \
 		-iname '*.wv'   -o \
 		-iname '*.aac'  -o \
 		-iname '*.wav'  -o \
+		-iname '*.wma'  -o \
+		-iname '*.ogg'  -o \
+		-iname '*.ac3'  -o \
+		-iname '*.dts'  -o \
 		-iname '*.ape'  -o \
 		-iname '*.mpc' \) )
 EOF
+done