1 files changed, 108 insertions, 0 deletions
diff --git a/ffextract-audio b/ffextract-audio
new file mode 100755
index 0000000..b95dd8f
--- /dev/null
+++ b/ffextract-audio
@@ -0,0 +1,108 @@
+#!/bin/sh
+# See LICENSE file for copyright and license details.
+
+set -e
+
+usage () {
+	printf 'usage %s: [-Dry] in-file [out-file]\n' "$0" >&2
+	exit 1
+}
+
+recursive=no
+delete_in_file=no
+ffmpeg_flag_y=
+status=0
+
+while test "${1::1}" = '-'; do
+	if test "${1}" = '--'; then
+		shift
+		break
+	elif test "${1}" = '-'; then
+		break
+	fi
+
+	arg="${1:1}"
+	while test -n "${arg}"; do
+		flag="${arg::1}"
+		arg="${arg:1}"
+		if test "${flag}" = r; then
+			recursive=yes
+		elif test "${flag}" = D; then
+			delete_in_file=yes
+		elif test "${flag}" = y; then
+			ffmpeg_flag_y=-y
+		else
+			usage
+		fi
+	do
+done
+
+if test ! $# = 1 && test ! $# = 2; then
+	usage
+fi
+
+in_file="$1"
+if test -z "${in_file}"; then
+	usage
+fi
+
+out_file=""
+if test $# = 2; then
+	out_file="$2"
+	if test -z "${out_file}"; then
+		usage
+	fi
+fi
+
+getext () {
+	ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 -- "$1"
+}
+
+removeext () {
+	printf '%s\n' "$1" | sed 's/\.[^.]*$//'
+}
+
+extract () {
+	printf '\033[1m%s\033[m\n' "Extracting audio track from ${1}" >&2
+	printf '\033[1m%s\033[m\n' "and storing as ${2}" >&2
+	if ffmpeg -i "${1}" -vn -acodec copy ${ffmpeg_flag_y} -- "${2}"; then
+		if test ${delete_in_file} = yes; then
+			unlink -- "${1}"
+		fi
+	fi
+}
+
+if test ${recursive} = no || test ! -d "${in_file}"; then
+	if test -z "${out_file}"; then
+		out_file="$(removeext "${in_file}").$(getext "${in_file}")"
+	fi
+	extract "${in_file}" "${out_file}"
+	exit $?
+fi
+
+recursive () {
+	for in_file in "${1}/"*; do
+		out_file="$2/$(basename -- "${in_file}")"
+		if test -d "$f"; then
+			mkdir -p -- "${out_file}"
+			recursive "${in_file}" "${out_file}"
+		else
+			out_file="$(removeext "${out_file}").$(getext "${in_file}")"
+			if ! extract "${in_file}" "${out_file}"; then
+				status=1
+			fi
+		fi
+	done
+	if test ${delete_in_file} = yes; then
+		rmdir -- "${1}" 2>/dev/null || :
+	fi
+}
+
+if test -z "${out_file}"; then
+	out_file="${in_file}"
+else
+	mkdir -p -- "${out_file}"
+fi
+recursive "${in_file}" "${out_file}"
+
+exit $status