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|
#!/usr/bin/env zsh
# use parallel jobs to convert audio files from one format to another
source "$HOME/.config/init/helpers" || exit 1
local callstr=$0
usage() {
echo "Usage: $callstr [OPTIONS...] <infile>..."
echo "Convert multiple audio files to a new format"
echo ""
echo " \e[1mdescription opt longform arg default\e[0m"
echo " output codec -c --codec <codec> opus"
echo " output bitrate -b --bitrate <int>k (opus:35k, vorbis:50k, mp3:65k, flac:N/A)"
echo " output quality -q --quality <int> N/A"
echo " output directory -d --dest <dir> ."
echo " copy metadata -m --metadata <bool> false"
echo " background job count -j --jobs <int> 4"
echo " print this help -h --help"
exit 0
}
local pid
trap_abort() {
echo ""
abort "process interrupted"
}
trap 'trap_abort' SIGHUP SIGINT SIGQUIT SIGTERM
local codecpat='^(opus|mp3|vorbis|flac)$'
local bitratepat='^[1-9][0-9]*k$'
local qpatvorbis='^([0-9]|10)$'
local qpatmp3='^[0-9]$'
local codecstr
local codecprintstr
local extstr
local bitratestr
local bitrateset
local metastr
local dirstr
local qstr
local jobcount
local args
local parseerr=$(2>&1 zparseopts -D -E -M -A args \
c: -codec:=c \
b: -bitrate:=b \
q: -quality:=q \
d: -dest:=d -destination:=d \
j: -jobs:=j \
m:: -metadata::=m \
f:: -force::=f \
h -help=h | cut -d ' ' -f 2-)
[[ -z $parseerr ]] || abort $parseerr
zparseopts -D -E -M -A args \
c: -codec:=c \
b: -bitrate:=b \
q: -quality:=q \
d: -dest:=d -destination:=d \
j: -jobs:=j \
m:: -metadata::=m \
f:: -force::=f \
h -help=h
local optarg
local opt
for opt in ${(@k)args}; do
unset optarg
[[ -z $args[$opt] ]] || optarg=$args[$opt]
case $opt in
-c) [[ $optarg =~ $codecpat ]] || \
abort "codec must be one of \`opus\`, \`mp3\`, \`flac\`, or \`vorbis\`"
[[ ${optarg} == 'opus' ]] \
&& codecprintstr=${optarg} \
&& codecstr='libopus' && extstr='opus' \
&& [[ -z $bitratestr ]] && bitratestr='35k'
[[ ${optarg} == 'mp3' ]] \
&& codecprintstr=${optarg} \
&& codecstr='libmp3lame' && extstr='mp3' \
&& [[ -z $bitratestr ]] && bitratestr='65k'
[[ ${optarg} == 'vorbis' ]] \
&& codecprintstr=${optarg} \
&& codecstr='libvorbis' && extstr='ogg' \
&& [[ -z $bitratestr ]] && bitratestr='50k'
[[ ${optarg} == 'flac' ]] \
&& codecprintstr=${optarg} \
&& codecstr='flac' && extstr='flac' \
&& [[ -z $bitratestr ]] && bitratestr=''
;;
-b) [[ $optarg =~ $bitratepat ]] || \
abort "bitrate must positive integer + k, for kbps"
bitratestr=$optarg
bitrateset=1
;;
-q) qstr=$optarg ;;
-d) dirstr=$optarg ;;
-j) [[ $optarg =~ $posunsignedpat ]] || \
abort "job count must be a non-negative integer"
jobcount=$optarg
;;
-m) if [[ $optarg ]]; then
[[ $optarg =~ $boolpat ]] || \
abort "metadata must be a boolean value (e.g. \`true\` or \`false\`)"
[[ $optarg =~ $booltpat ]] && metastr=("-map_metadata" "0") \
|| metastr=("-map_metadata" "-1")
else
metastr=("-map_metadata" "0")
fi
;;
-h) usage ;;
esac
done
[[ $#@ -eq 0 ]] && abort "no input files specified"
[[ -z $codecstr ]] && codecstr='libopus'
[[ -z $bitratestr ]] && bitratestr='35k'
[[ -z $codecprintstr ]] && codecprintstr='opus'
[[ -z $extstr ]] && extstr='opus'
[[ -z $jobcount ]] && jobcount=4
[[ -z $dirstr ]] && dirstr='.'
[[ -z $metastr ]] && metastr=("-map_metadata" "-1")
if [[ ! -z $qstr ]]; then
[[ -z $bitratset ]] || abort "-b and -q are not compatible"
[[ $codecstr == "libopus" ]] && abort "-q cannot be used with opus"
[[ $codecstr == "flac" ]] && abort "-q cannot be used with flac"
[[ $codecstr == "libvorbis" ]] && [[ ! $qstr =~ $qpatvorbis ]] \
&& abort "for vorbis, -q must be in the range [0-10]"
[[ $codecstr == "libmp3lame" ]] && [[ ! $qstr =~ $qpatmp3 ]] \
&& abort "for mp3, -q must be in the range [0-9]"
fi
if [[ $codecstr == "flac" ]]; then
bitratestr=''
[[ -z $bitrateset ]] || abort "-b cannot be used with flac"
fi
local roots=(${@:t:r})
local uniqroots=(${(u)roots})
[[ $#roots == $#uniqroots ]] \
|| abort "input contains files which share a root name (i.e. when extension is stripped)"
local filecount=$#@
local f
for f in $@; do
[[ -f $f ]] || abort "could not read file \`$f\`"
done
2>/dev/null mkdir -p $dirstr || abort "could not write to directory \`$dirstr\`"
for f in $@; do
local dest="$dirstr/${f:t:r}.$extstr"
if [[ -e $dest ]]; then
printf "destination file \`$dest\` exists\ndelete it? [y/N]: "
read -q delprompt
print ""
[[ $delprompt = "y" ]] || return 0
2>/dev/null rm $dest || abort "could not delete file \`$dest\`"
fi
done
local totalstr="${#@} file"
[[ $#@ -ne 1 ]] && totalstr="${totalstr}s"
local jobstr=$jobcount
[[ $#@ -lt $jobcount ]] && jobstr=$#@
[[ $jobstr -gt 1 ]] && jobstr="${jobstr} jobs" || jobstr="${jobstr} job"
coproc {
local joblist=()
local c
while read -d $'\0' c; do
[[ $c == "done" ]] && break
local f=${c:s/file:/}
local dest="$dirstr/${f:t:r}.$extstr"
(
1>/dev/null 2>&1 </dev/null ffmpeg -loglevel -8 -i $f \
-vn -sn -c:a $codecstr \
${bitratestr/*k/-b:a} $bitratestr \
${qstr/[0-9]*/-q:a} $qstr \
$metastr \
$dest
echo "next"
) &
joblist+=$!
done
local j
for j in $joblist; do
2>/dev/null wait $j
done
echo "done"
}
repeat $jobcount; do
if [[ $#@ -gt 0 ]]; then
1>&p printf "file:%s\0" $@[1]
shift
fi
done
while read -p line; do
[[ $line == "done" ]] && coproc exit && break
echo $line
if [[ $#@ -gt 0 ]]; then
1>&p printf "file:%s\0" $@[1]
shift
else
1>&p printf "done\0"
fi
done | progress-bar $filecount "using $jobstr to convert $totalstr to $codecprintstr"
|
