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#!/bin/sh
# file identification script
#
# manual usage:
# mpv_identify.sh foo.mkv
#
# sh/dash/ksh/bash usage:
# . mpv_identify.sh FOO_ foo.mkv
# will fill properties into variables like FOO_length
#
# zsh usage:
# mpv_identify() { emulate -L sh; . mpv_identify.sh "$@"; }
# mpv_identify FOO_ foo.mkv
# will fill properties into variables like FOO_length
#
# When multiple files were specified, their info will be put into FOO_* for the
# first file, FOO_1_* for the second file, FOO_2_* for the third file, etc.
__midentify__main() {
case "$0" in
mpv_identify.sh|*/mpv_identify.sh)
# we are NOT being sourced
[ -n "$1" ] && set -- '' "$@"
;;
esac
if [ "$#" -lt 2 ]; then
cat >&2 <<EOF
Usage 1 (for humans only): $0 filename.mkv
will print all property values.
Note that this output really shouldn't be parsed, as the
format is subject to change.
Usage 2 (for use by scripts): see top of this file
NOTE: for mkv with ordered chapters, this may
not always identify the specified file, but the
file providing the first chapter. Specify
--no-ordered-chapters to prevent this.
EOF
return 2
fi
local LF="
"
local nextprefix="$1"
shift
if [ -n "$nextprefix" ]; then
# in case of error, we always want this unset
unset "${nextprefix}path"
fi
local allprops="
filename
path
stream-start
stream-end
stream-length
demuxer
length
chapters
editions
titles
duration
audio
audio-bitrate
audio-codec
audio-codec-name
video
angle
video-bitrate
video-codec
video-format
video-params/aspect
container-fps
width
height
dwidth
dheight
sub
"
# TODO add metadata support once mpv can do it
local propstr="X-MIDENTIFY-START:$LF"
local key
for key in $allprops; do
propstr="${propstr}X-MIDENTIFY: $key \${=$key}$LF"
key="$(printf '%s\n' "$key" | tr - _)"
unset "$nextprefix$key"
done
local fileindex=0
local prefix=
local line
while IFS= read -r line; do
case "$line" in
X-MIDENTIFY-START:)
if [ -n "$nextprefix" ]; then
prefix="$nextprefix"
if [ "$fileindex" -gt 0 ]; then
nextprefix="${prefix%${fileindex}_}"
fi
fileindex="$((fileindex+1))"
nextprefix="${nextprefix}${fileindex}_"
for key in $allprops; do
key="$(printf '%s\n' "$key" | tr - _)"
unset "$nextprefix$key"
done
else
if [ "$fileindex" -gt 0 ]; then
printf '\n'
fi
fileindex="$((fileindex+1))"
fi
;;
X-MIDENTIFY:\ *)
local key="${line#X-MIDENTIFY: }"
local value="${key#* }"
key="${key%% *}"
key="$(printf '%s\n' "$key" | tr - _)"
if [ -n "$nextprefix" ]; then
if [ -z "$prefix" ]; then
echo >&2 "Got X-MIDENTIFY: without X-MIDENTIFY-START:"
elif [ -n "$value" ]; then
eval "$prefix$key"='"$value"'
fi
else
if [ -n "$value" ]; then
printf '%s=%s\n' "$key" "$value"
fi
fi
;;
esac
done <<EOF
$(${MPV:-mpv} --term-playing-msg="$propstr" --vo=null --ao=null \
--frames=1 --quiet --no-cache --no-config -- "$@")
EOF
}
__midentify__main "$@"
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