add flacconv
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yoshiyoshyosh
GitHub
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commit
02571fb122
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#!/bin/sh
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set -euf
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set -x
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TAB="$(printf '\t')"
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NL='
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'
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BN="${0##*/}"
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errecho() {
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>&2 echo "$@"
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}
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fail() {
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errecho "error: $BN: $*"
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exit 1
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}
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warn() {
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errecho "warning: $BN: $*"
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if [ -z "$IGNOREWARNINGS" ]; then
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errecho 'you can ignore stopping for warnings in the future with -i'
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errecho 'press enter to continue, or C-v to quit'
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read -r _warning
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fi
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}
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_tempdir() {
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set +u
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[ "$TMPDIR" ] || \
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{ [ "$TEMP" ] && TMPDIR="$TEMP"; } || \
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{ [ "$TMP" ] && TMPDIR="$TMP"; } || \
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{ [ -d "/tmp" ] && TMPDIR="/tmp"; } || \
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{ [ -d "/var/tmp" ] && TMPDIR="/var/tmp"; } || \
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{ [ -d "/usr/tmp" ] && TMPDIR="/usr/tmp"; } || \
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TMPDIR="$PWD"
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set -u
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}
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metaflac() { command metaflac --no-utf8-convert "$@"; } # don't wanna fuck up any tags from locale shit
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# some code reused from https://gist.github.com/berturion/5377d6653ef93049f4ff54cff2003e11#file-flac2opus-sh
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process_file() {
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infile="$1"
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bname="${infile##*/}"
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tags="$(metaflac --export-tags-to=- "$infile")"
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# check if flac has a picture, if not, set RMPIC
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metaflac --export-picture-to=- "$infile" 1>/dev/null 2>&1 || RMPIC=1
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# first remove any potential ID3 tags
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head_bytes="$(dd if="$infile" of=/dev/stdout bs=1 count=3 2>/dev/null)"
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if [ "$head_bytes" = "ID3" ] && [ -z "${NO_ID3:-}" ]; then
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errecho "invalid id3 tags found in $infile, fixing automatically"
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id3v2 -D "$infile"
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metaflac --remove-all-tags --import-tags-from=- "$infile" <<-EOF
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$tags
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EOF
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fi
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# now test if keepkeys or whatever was used, set exported tags
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if [ "$KEEPKEYS" ]; then
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tags="$(printf '%s' "$tags" | grep -E "^$KEEPKEYS")"
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elif [ "$REMOVEKEYS" ]; then
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[ "$REMOVEKEYS" = "ALL" ] && REMOVEKEYS=''
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tags="$(printf '%s' "$tags" | grep -v -E "^$REMOVEKEYS")"
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fi
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# time to encode
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IFS="$TAB$NL"
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if [ "$TYPE" = "opus" ]; then
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VLVL=
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opustags=""
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while read -r tag; do # build opus comment chain, can't "import" tags like with flac"
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opustags="${opustags}${TAB}--comment${TAB}${tag}"
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done <<-EOF
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$tags
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EOF
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if [ "$RMPIC" ]; then
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opusenc --discard-comments $opustags --bitrate "${BITRATE}k" "$infile" "${infile%.*}.opus"
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else
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metaflac --export-picture-to=- "$infile" | opusenc --discard-comments $opustags --bitrate "${BITRATE}k" --picture /dev/stdin "$infile" "${infile%.*}.opus"
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fi
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ret="$?"
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else
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album="$(printf "%s" "$tags" | sed -n 's/^ALBUM=//p')"
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artist="$(printf "%s" "$tags" | sed -n 's/^ARTIST=//p')"
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albumartist="$(printf "%s" "$tags" | sed -n 's/^ALBUMARTIST=//p')"
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title="$(printf "%s" "$tags" | sed -n 's/^TITLE=//p')"
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year="$(printf "%s" "$tags" | sed -n 's/^DATE=//p')"
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genre="$(printf "%s" "$tags" | sed -n 's/^GENRE=//p')"
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tracknumber="$(printf "%s" "$tags" | sed -n 's/^TRACKNUMBER=//p')"
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comment="$(printf "%s" "$tags" | sed -n 's/^COMMENT=//p')"
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if [ -z "$RMPIC" ]; then
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pic="$TMPDIR/${bname%.*}_IMG"
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metaflac --export-picture-to="$pic" "$infile"
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fi
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[ "$VLVL" ] || cbr="-b${TAB}$BITRATE${TAB}--cbr"
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flac --decode --stdout "$infile" 2>/dev/null | lame -q 0 ${cbr:--V${TAB}${VLVL}} --add-id3v2 --tt "$title" --ta "$artist" --tl "$album" --ty "$year" --tn "$tracknumber" --tg "$genre" --tc "$comment" --tv "TPE2=$albumartist" ${pic:+--ti${TAB}"${pic}"} - "${infile%.*}.mp3" 1>/dev/null 2>&1
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ret="$?"
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[ "${pic:-}" ] && rm -f "$pic"
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fi
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{ [ "$ret" -eq 0 ] && echo "$infile successfully converted to $TYPE with bitrate/quality ${VLVL:-${BITRATE}k}" ; } || { echo "an error occured while encoding $infile, not deleting" && DELETE= ; }
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[ "$DELETE" -eq 1 ] && rm -f "$infile" || true
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}
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usage() {
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errecho \
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"usage: $BN [-hdp3] [-b BITRATE] [-v LEVEL] [-k KEYS] [-r KEYS] [-j THREADS] [--] [DIRECTORY...]
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$BN recursively converts directories of flac files to opus/mp3
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DIRECTORY can be specified multiple times. if omitted, the current directory is used
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by default, this script outputs opus and bitrate 128k
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if encoding to mp3, the only metadata that will be kept is the following:
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TITLE, ARTIST, ALBUM, ALBUMARTIST, DATE, GENRE, TRACKNUMBER, COMMENT, and the cover picture
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-h show script help
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-i ignore script-stopping warnings
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-d delete original flac files after transcoding
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-3 switch output filetype to mp3
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-b <BITRATE> output bitrate in kbits (default 128)
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this value is variable for opus & CBR for mp3
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-v <LEVEL> mp3 only: use specified mp3 variable quality (0-9). integer only
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OVERRIDES -b
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-k <KEYS> keep specified flac metadata KEYS in output file
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keys can be checked with metaflac --export-tags-to=- FILE
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option argument is a PIPE-separated list of UPPERCASE keys to keep
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(i.e. -m 'ARTIST|TITLE|ALBUMARTIST|ALBUM|DATE')
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if both -k and -r are not present, all keys are kept.
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-r <KEYS> remove specified flac metadata KEYS in output file
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cannot be used with -k
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option argument is of the same format as -k
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if set to 'ALL', all keys are removed
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-p remove embedded picture in output files
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-j <THREADS> use the specified amount of threads for parallel processing
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if omitted, CPU core count will be used"
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}
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set +u
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DELETE=0
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TYPE=opus
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BITRATE=128
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VLVL=
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RMPIC=
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KEEPKEYS=
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REMOVEKEYS=
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IGNOREWARNINGS=
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THREADS="$(getconf _NPROCESSORS_ONLN 2>/dev/null || getconf NPROCESSORS_ONLN)" # linux & freebsd compat I think
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_tempdir # set temp dir
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while getopts :hd3peib:v:k:r:j: OPT; do
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case "$OPT" in
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h) usage && exit 0 ;;
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d) DELETE=1 ;;
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3) TYPE=mp3 ;;
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p) RMPIC=1 ;;
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i) IGNOREWARNINGS=1 ;;
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b) BITRATE="$OPTARG" ;;
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v) VLVL="$OPTARG" ;;
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k) KEEPKEYS="$OPTARG" ;;
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r) REMOVEKEYS="$OPTARG" ;;
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j) THREADS="$OPTARG" ;;
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*) fail "unknown option: -$OPTARG. run $BN -h to see all options" ;;
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esac
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done
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shift "$((OPTIND - 1))"
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command -v metaflac 1>/dev/null 2>&1 || fail 'flac tools are not installed! (metaflac)'
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[ $TYPE = "mp3" ] && { command -v lame 1>/dev/null 2>&1 || fail 'lame is not installed!' ; }
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[ $TYPE = "opus" ] && { command -v opusenc 1>/dev/null 2>&1 || fail 'opus-tools is not installed! (opusenc)' ; }
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command -v id3v2 1>/dev/null 2>&1 || { warn 'id3v2 not installed! invalid id3 tags in a flac file will not be removed' && NO_ID3=1 ; }
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{ [ "$KEEPKEYS" ] && [ "$REMOVEKEYS" ]; } && fail 'don'\''t use -k and -r in the same call!'
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# this script assumes you aren't using newlines in path names
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# I do not want to change it to account for this
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# you should never put newlines in paths
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# it is a very bad idea for many programs
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FLACFILES="$(find "$@" -type f -name "*.flac")"
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[ -z "$FLACFILES" ] && fail 'no flac files found!'
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# make a fifo/fd for parallel stuff
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mk_parallel_fd() {
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fifo_para="$(mktemp -u "$TMPDIR/flacconvXXXX")"
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mkfifo "$fifo_para"
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exec 9<>"$fifo_para"
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rm -f "$fifo_para"
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while [ "$THREADS" -gt 0 ]; do
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printf "\n" >&9 # start with THREADS amount of lines in fd 9 for later
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THREADS="$((THREADS - 1))"
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done
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}
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# read each line from fd 9, launch new program for each line
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# print a line after program finished such that another one can take its place
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run_in_parallel() {
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cmd="$1"
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shift
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read -r __ <&9
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{
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"$cmd" "$@"
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printf '\n' >&9
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} &
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}
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test_2() {
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echo "$*"
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sleep 5
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}
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mk_parallel_fd
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while read -r file; do
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run_in_parallel process_file "$file"
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done <<-EOF
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$FLACFILES
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EOF
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wait
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