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#compdef ffmpeg

local context state line
typeset -A opt_args

local BOLD=$'\e[1m'
local NORM=$'\e[m'

_ffmpeg_compadd() {
    compadd -X "${BOLD}$1${NORM}" -q -S "$3" -a $2
}

_ffmpeg_presets() {
    local presets
    presets=(~/.ffmpeg/*.ffpreset(:t:r) "$FFMPEG_DATADIR"/*.ffpreset(:t:r))
    _ffmpeg_compadd 'select preset' presets ''
}

_ffmpeg_acodecs() {
    local acodecs
    acodecs=(${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]A[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
    _ffmpeg_compadd 'force audio codec (''copy'' to copy stream)' acodecs ''
}

_ffmpeg_vcodecs() {
    local vcodecs
    vcodecs=(${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]V[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
    _ffmpeg_compadd 'force video codec (''copy'' to copy stream)' vcodecs ''
}

_ffmpeg_formats() {
    local formats
    formats=(${(ou)${=${(s:,:)${${(M)${(f)"$(ffmpeg -formats 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]][[:space:]][^[:space:]]##*}//(#b)????([^[:space:]]##)*/$match[1]}}}})
    _ffmpeg_compadd 'force format' formats ''
}

_ffmpeg_list_pix_fmts() {
    print -l ${${(M)${(f)"$(ffmpeg -pix_fmts 2>/dev/null)"}:#[I.]*}//(#b)??????([^[:space:]]##)*/$match[1]}
}

_ffmpeg_pix_fmts() {
    local pix_fmts
    pix_fmts=($(_ffmpeg_list_pix_fmts))
    _ffmpeg_compadd 'set pixel format' pix_fmts ''
}

_ffmpeg_bsfs() {
    local bsfs
    bsfs=(${${(f)"$(ffmpeg -bsfs 2>/dev/null)"}:#*:})
    _ffmpeg_compadd 'set bitstream filter' bsfs ''
}

_ffmpeg_argspecs="$(ffmpeg -h 2>/dev/null | perl -e '
my $lastopt;
my $lastopt_description;
my $lastopt_takesargs;
my @lastopt_values;
while (<>) {
    if (/^(-\S+)\s+(\S.+)$/) {
        print_opt();
        $lastopt = $1;
        $lastopt_description = $2;
        if ($lastopt_description =~ /<\w+>/) {
            $lastopt_description =~ s/<.*?>\s+//;
            $lastopt_description =~ s/\S{5} ?//;
            $lastopt_description = $lastopt if not $lastopt_description;
            escape_str($lastopt_description);
        } elsif ($lastopt_description =~ /^(\S+)\s\s+/) {
            my $example = $1;
            $lastopt_description =~ s/^\S+\s\s+//;
            escape_str($example);
            escape_str($lastopt_description);
            if ($example eq q(filename)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(:$lastopt_description:_files);
            } elsif ($lastopt =~ /^-[asv]pre$/) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_presets);
            } elsif ($lastopt eq q(-acodec)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_acodecs);
            } elsif ($lastopt eq q(-vcodec)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_vcodecs);
            } elsif ($lastopt eq q(-f)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_formats);
            } elsif ($lastopt eq q(-pix_fmt)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_pix_fmts);
            } elsif ($example eq q(bitstream_filter)) {
                $lastopt_takesargs = 0;
                $lastopt .= qq(: :_ffmpeg_bsfs);
            } else {
                $lastopt_takesargs = 1;
                $lastopt_description .= qq{ ($example)};
            }
        } else {
            $lastopt_takesargs = 0;
            if ($lastopt eq q(-vfilters)) {
                $lastopt .= qq(: :->vfilters);
            }
        }
        @lastopt_values = ();
    } elsif (/^   (\S+)/) {
        $lastopt_takesargs = 1;
        push @lastopt_values, $1;
    }
}
print_opt();
exit;

sub escape_str {
    $_[0] =~ s/:/\\:/g;
}

sub print_opt {
    return if not $lastopt;

    print qq($lastopt);
    if (!$lastopt_takesargs) {
        print qq(\n);
    } else {
        print qq(:$lastopt_description:);
        if (@lastopt_values) {
            printf qq{(%s)}, join(q( ), @lastopt_values);
        }
        print qq(\n);
    }
}
')"
_ffmpeg_argspecs=(${(f)_ffmpeg_argspecs})

_arguments -S \
    "${_ffmpeg_argspecs[@]}" \
    '*:output file:_files' \
    && return 0

[[ "$state" == "vfilters" ]] &&
 _values -s , -S = 'video filters' \
 'aspect:set aspect ratio (rational number X\:Y or decimal number):' \
 'crop:crop input video (x\:y\:width\:height):' \
 'format: :->format' \
 'noformat: :->noformat' \
 'null' \
 'pad:add pads to the input image (width\:height\:x\:y\:color_string):' \
 'pixelaspect:set pixel aspect ratio (rational number X\:Y or decimal number):' \
 'scale:scale input video (width\:height):' \
 'slicify:output slice height ("random" or a number of pixels):' \
 'unsharp:luma_x\:luma_y\:luma_amount\:chroma_x\:chroma_y\:chroma_amount:' \
 'vflip' \
 'buffer' \
 'nullsrc' \
 'nullsink' \
 && return 0

[[ "$state" == "format" ]] &&
 _values -s : -S = 'convert input video to one of the specified pixel formats' $(_ffmpeg_list_pix_fmts) && return 0

[[ "$state" == "noformat" ]] &&
 _values -s : -S = 'disable specified pixel formats by force' $(_ffmpeg_list_pix_fmts) && return 0

return 1

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