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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| #!/bin/bash | ||
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| # === Verify `compton --dbus` status === | ||
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| if [ -z "`dbus-send --session --dest=org.freedesktop.DBus --type=method_call --print-reply /org/freedesktop/DBus org.freedesktop.DBus.ListNames | grep compton`" ]; then | ||
| echo "compton DBus interface unavailable" | ||
| if [ -n "`pgrep compton`" ]; then | ||
| echo "compton running without dbus interface" | ||
| #killall compton & # Causes all windows to flicker away and come back ugly. | ||
| #compton --dbus & # Causes all windows to flicker away and come back beautiful | ||
| else | ||
| echo "compton not running" | ||
| fi | ||
| exit 1; | ||
| fi | ||
|
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| # === Get connection parameters === | ||
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| dpy=$(echo -n "$DISPLAY" | tr -c '[:alnum:]' _) | ||
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| if [ -z "$dpy" ]; then | ||
| echo "Cannot find display." | ||
| exit 1; | ||
| fi | ||
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| service="com.github.chjj.compton.${dpy}" | ||
| interface="com.github.chjj.compton" | ||
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| compton_dbus="dbus-send --print-reply=literal --dest="${service}" / "${interface}"." | ||
| compton_dbus_h="dbus-send --print-reply --dest="${service}" / "${interface}"." | ||
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| # === Try using flock === | ||
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| unbright="/dev/shm/unbright.$dpy" | ||
| if hash flock 2>/dev/null; then | ||
| flock="flock ${unbright}" | ||
| else | ||
| echo 'flock not found, running without it' | ||
| fi | ||
|
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| # === Get camera device === | ||
| if [[ -z "$1" ]] || [[ ! -c "$1" ]]; then | ||
| echo "usage: $0 <camera device>" | ||
| exit 1 | ||
| else | ||
| cam="$1" | ||
| fi | ||
|
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| # === Sample parameters === | ||
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| max_dim=55 | ||
| frame_ms=30 | ||
| rule='!(class_g ~= "^(URxvt|mpv|Sxiv)$" || _NET_WM_WINDOW_TYPE@:32a *= "DOCK")' | ||
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| # === Trap === | ||
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| trap '_remove; _repaint; trap - SIGTERM && kill -- -$$' SIGINT SIGTERM EXIT | ||
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| _insert() { | ||
| ${compton_dbus}dim_rule_update string:insert string:"${1}:${rule}" | ||
| } | ||
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| _remove() { | ||
| if [ ! -z "$last_repr" ]; then | ||
| ${compton_dbus}dim_rule_update string:remove string:"$last_repr" >/dev/null 2>&1 | ||
| if [[ $? -ne 0 ]]; then | ||
| # Exiting during replace(). Fingers crossed we're removing the | ||
| # right thing | ||
| last_repr=$(${compton_dbus_h}opts_get string:dim-rule | \ | ||
| grep -m1 -Po '(?<=string ").*(?=")') | ||
| _remove | ||
| fi | ||
| fi | ||
| } | ||
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| _replace() { | ||
| ${compton_dbus}dim_rule_update string:replace string:"$last_repr" string:"${1}:${rule}" | ||
| } | ||
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| _repaint() { | ||
| ${compton_dbus}repaint >/dev/null | ||
| } | ||
|
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| replace() { | ||
| local new | ||
| if [[ -z "$last_repr" ]]; then | ||
| new=$(_insert $1) | ||
| else | ||
| new=$(_replace $1) | ||
| fi | ||
| last_repr=${new:3} | ||
| _repaint | ||
| } | ||
|
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| _normalize() { | ||
| old_min=72 | ||
| old_max=184 | ||
| new_min=0 | ||
| new_max=100 | ||
| old_val=$1 | ||
| new_val=$(( (((old_val - old_min) * (new_max - new_min)) / \ | ||
| (old_max - old_min)) + new_min )) | ||
| echo $new_val | ||
| } | ||
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| read_camera() { | ||
| # If your camera starts with odd brightness, have a go at these: | ||
| # if [[ $first_call -eq 1 ]]; then | ||
| # v4l2-ctl -d "$cam" -c exposure_auto=3 2>/dev/null | ||
| # v4l2-ctl -d "$cam" -c exposure_auto=1 2>/dev/null | ||
| # | ||
| # local ea=$(v4l2-ctl -d "$cam" -l | grep exposure_absolute | grep -Po '(?<=default=)\d+') | ||
| # v4l2-ctl -d "$cam" -c exposure_absolute=$ea 2>/dev/null | ||
| # | ||
| # local g=$(v4l2-ctl -d "$cam" -l | grep gain | grep -Po '(?<=default=)\d+') | ||
| # v4l2-ctl -d "$cam" -c gain=$g 2>/dev/null | ||
| # | ||
| # first=0 | ||
| # else | ||
| while read -r brightness; do | ||
| $flock echo $(_normalize "$brightness") > $unbright | ||
| done < <(ffmpeg \ | ||
| -hide_banner \ | ||
| -f video4linux2 \ | ||
| -s 640x480 \ | ||
| -i "$cam" \ | ||
| -filter:v "fps=fps=30, showinfo" \ | ||
| -f null - 2>&1 \ | ||
| | stdbuf -oL grep -Po '(?<=mean:\[)[0-9]*') | ||
| } | ||
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| rm -f "$unbright" | ||
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| read_camera & | ||
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| last_set=0 | ||
| last_brightness=0 | ||
| while :; do | ||
| # TODO Implement frame-dropping | ||
| start_date=$(date +%s%3N) | ||
|
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| brightness=$($flock cat "$unbright" 2>/dev/null) | ||
| if [[ ! -z $brightness ]]; then | ||
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| new_aim=$(( $max_dim - $brightness )) | ||
| [[ $new_aim -lt 0 ]] && new_aim=0 | ||
| [[ $new_aim -gt 100 ]] && new_aim=100 | ||
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| # +1 is poor man's way of avoiding some flicker. TODO become rich | ||
| if [[ $new_aim -gt $(( last_set + 1 )) ]]; then | ||
| last_set=$(( last_set + 1 )) | ||
| replace $last_set | ||
| elif [[ $new_aim -lt $(( $last_set - 1 )) ]]; then | ||
| last_set=$(( last_set - 1 )) | ||
| replace $last_set | ||
| fi | ||
| # echo $brightness $new_aim $last_set | ||
| fi | ||
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| last_brightness=$brightness | ||
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| end_date=$(date +%s%3N) | ||
| diff_date=$(( end_date - start_date )) | ||
| # -1 is time spent on invoking `sleep` and `printf`, kind of | ||
| to_sleep=$(( frame_ms - diff_date - 1 )) | ||
| [[ $to_sleep -gt 0 ]] && sleep $(printf "0.0%02d" $to_sleep) | ||
| done |
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