camera: low latency preview and picture

- Take pictures by pressing "s" when the preview opens.
- Depends on sxmo_autorotate.sh
- movie is not currently working. See comments in code
- uses sxiv for image previews of photos taken during that photoshoot
- TODO: use sxiv keyhandlers to add a delete photo function
	- See: /usr/share/examples/sxiv/key-handler
	- I dont know how we would distribute this

scripts/core/sxmo_appmenu.sh

@@ -176,6 +176,7 @@ programchoicesinit() {
 		 Rotate ↻        ^ 1 ^ key greater
 		 Flip ⇄          ^ 1 ^ key question
 		 Flip ⇅          ^ 1 ^ key bar
+		 Thumbnail ⊡     ^ 0 ^ key Return
 		"
 		WINNAME=Sxiv && return
 	elif echo "$WMCLASS" | grep -i "st-256color"; then

scripts/core/sxmo_camera.sh

@@ -1,8 +1,143 @@
  #!/usr/bin/env sh
-err() {
-	printf %b "$1" | dmenu -fn Terminus-20 -c -l 10
-	exit 1
+
+SXMO_IMAGESDIR="$XDG_PICTURES_DIR/sxmo"
+
+node_rear="ov5640 3-004c"
+route_rear="ov5640"
+mode_rear="1920x1080@20"
+
+node_front="gc2145 3-003c"
+route_front="gc2145"
+mode_front="1600x1200@15"
+
+pixfmt='UYVY'
+
+set_route () {
+	camera="$1"
+	if [ "$camera" = "$route_rear" ]
+	then
+		link1='"gc2145 3-003c":0->"sun6i-csi":0[0]'
+		link2='"ov5640 3-004c":0->"sun6i-csi":0[1]'
+	elif [ "$camera" = "$route_front"  ]
+	then
+		link1='"ov5640 3-004c":0->"sun6i-csi":0[0]'
+		link2='"gc2145 3-003c":0->"sun6i-csi":0[1]'
+	fi
+
+	media-ctl -d /dev/media1 --links "$link1" && media-ctl -d /dev/media1 --links "$link2" || exit 1
+}
+
+setup () {
+	node="$1" 
+	mode="$2" 
+
+	res="${mode%%@*}"
+	speed="${mode##*@}"
+
+	busfmt='UYVY8_2X8'
+
+	setup="media-ctl -d /dev/media1 --set-v4l2 '\"$node\":0[fmt:$busfmt/$res@1/$speed]'"
+	eval "$setup"
+
+	height="${res%%x*}"
+	width="${res##*x}"
+
+	v4l2-ctl --device /dev/video1 --set-fmt-video="width=$width,height=$height,pixelformat=$pixfmt"
+}
+
+still () {
+	node="$1" 
+	mode="$2" 
+	angle="$3"
+	skip="$4"
+
+	setup "$node" "$mode"
+
+	speed="30"
+	res="${mode%%@*}"
+	speed="${mode##*@}"
+
+	height="${res##*x}"
+	width="${res%%x*}"
+
+	mkdir "$SXMO_IMAGESDIR"
+
+	SCREENSHOT_PRE="$(date)"
+
+	mplayer tv:// -tv driver=v4l2:width=$width:height=$height:device=/dev/video1 -fps $speed -vf rotate="$angle",screenshot="$SXMO_IMAGESDIR/$SCREENSHOT_PRE"
+
+	find "$SXMO_IMAGESDIR" -iname "$SCREENSHOT_PRE*" | sxiv -t -i -
+
+	# mpv command doesnt work =( https://wiki.archlinux.org/index.php/Webcam_setup#MPlayer
+	# mpv --demuxer-lavf-format=video4linux2 --demuxer-lavf-o-set=input_format=rawvideo:video_size=1920x1080:framerate=20 av://v4l2:/dev/video1 --profile=low-latency
+
+}
+
+movie () {
+	# Not working but shows off the performance of this script
+	node="$1" 
+	mode="$2" 
+	angle="$3"
+	skip="$4"
+
+	setup "$node" "$mode"
+
+	speed="30"
+	res="${mode%%@*}"
+	speed="${mode##*@}"
+
+	height="${res##*x}"
+	width="${res%%x*}"
+
+	VIDEO_NAME="$SXMO_IMAGESDIR"/"$(date)".mkv
+	# this command gives the best performance but I cannot get a video preview with this command =(
+	# please note, to stop recording, you need to type `killall ffmpeg` in a terminal
+	ffmpeg -f v4l2 -framerate $speed -video_size $res -i /dev/video1 -preset ultrafast -filter:v fps=fps=$speed -f matroska "$VIDEO_NAME"
+
+
+	save="Save: $VIDEO_NAME"
+	playback="Playback: $(ffprobe -v quiet -of csv=p=0 -show_entries format=duration "$VIDEO_NAME")"
+	delete="Delete Recording"
+
+	DONE=0
+
+	while [ $DONE != 1 ]; do
+		result="$(printf %b "$save\n$playback\n$delete" | dmenu -fn Terminus-30 -c -p "Record" -l 20)"
+		if [ "$result" = "$save" ]; then
+			return 0
+		elif [ "$result" = "$playback" ]; then
+			mpv "$VIDEO_NAME"
+		else
+			rm "$VIDEO_NAME"
+			return 0
+		fi
+	done
+
+
+	# outputs 10 fps =(
+	# ffmpeg -f v4l2 -framerate $speed -video_size $res -i /dev/video1 -preset ultrafast -filter:v fps=fps=$speed -f matroska pipe: | tee file.mkv | mplayer - -fps $speed -vf screenshot
+
+	# I tried forking ffmpeg to background and using mplayer. When mplayer closes, killall ffmpeg. It didnt work =(
+	#mplayer tv:// -tv driver=v4l2:width=$width:height=$height:device=/dev/video1 -fps $speed -vf screenshot 
+
 }
 
-media-ctl -d /dev/media1 --set-v4l2 '"ov5640 3-004c":0[fmt:UYVY8_2X8/1280x720]' || err "Couldn't open camera, is camera enabled?"
-mpv --video-rotate=90 av://v4l2:/dev/video1
+
+type="$(printf %b "picture\nmovie" | dmenu -fn Terminus-30 -c -p "Record" -l 20)"
+camera="$(printf %b "front\nrear" | dmenu -fn Terminus-30 -c -p "Record" -l 20)"
+
+# Note: "angle" is set according to mplayer's conventions. See man mplayer and look for "rotate"
+
+[ "$camera" = "rear" ] && set_route "$route_rear" && skip=5 && node="$node_rear" && mode="$mode_rear" && angle="1"
+[ "$camera" = "front" ] && set_route "$route_front" && skip=0 && node="$node_front" && mode="$mode_front" && angle="2"
+
+# our angle variables are set for rotnormal orientation
+# rotating will ruin the preview
+RUNNING_AUTO="$(ps aux | grep "sh /usr/bin/sxmo_autorotate.sh" | grep -v grep | cut -f2 -d' ')"
+[ -n "$RUNNING_AUTO" ] && echo "$RUNNING_AUTO" | tr '\n' ' ' | xargs kill -9; notify-send "Turning autorotate off"
+sxmo_rotate.sh isrotated && sxmo_rotate.sh rotnormal
+
+[ "$type" = "picture" ] && still "$node" "$mode" "$angle" "$skip"
+[ "$type" = "movie" ] && movie "$node" "$mode" "$angle" "$skip"
+
+[ -n "$RUNNING_AUTO" ] && sxmo_autorotate.sh

scripts/core/sxmo_xinit.sh

@@ -12,6 +12,7 @@ envvars() {
 	[ -z "$XDG_CACHE_HOME" ] && export XDG_CACHE_HOME=~/.cache
 	[ -z "$XDG_DATA_HOME" ] && export XDG_DATA_HOME=~/.local/share
 	[ -z "$XDG_RUNTIME_HOME" ] && export XDG_RUNTIME_HOME=~/.local/run
+	[ -z "$XDG_PICTURES_DIR" ] && export XDG_PICTURES_DIR=~/Pictures
 }
 
 setupxdgruntimedir() {