#! /bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/conf/.zsh/audio-convert

convert-to () {
    local new_ext=$1
    shift

    local files=($@)

    local name
    local out
    for f in $files; do
        name=${f:r}
        out=${name}.${new_ext}
        ffmpeg -y -i $f $out
    done
}

get-wav () {
    local files=($@)
    convert-to "wav" $files
}

get-m4a () {
    local files=($@)
    convert-to "m4a" $files
}

get-mp3 () {
    local files=($@)

    local out
    for f in $files; do
        out=${f:r}.mp3
        # ffmpeg -i $f -b:a 320K -vn $out    # size 57M -> 145M :O
        # ffmpeg -i $f -vn -ar 44100 -ac 2 -b:a 192k $out # 87M :S
        ffmpeg -i $f -acodec libmp3lame $out              # 58M :)
    done
}