129 lines
3.0 KiB
Bash
Executable File
129 lines
3.0 KiB
Bash
Executable File
#!/bin/sh
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# default values for arguments
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ssh_host="root@10.11.99.1" # remarkable connected through USB
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landscape=true # rotate 90 degrees to the right
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output_path=- # display output through ffplay
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format=- # automatic output format
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# loop through arguments and process them
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while [ $# -gt 0 ]; do
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case "$1" in
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-p | --portrait)
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landscape=false
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shift
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;;
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-s | --source)
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ssh_host="$2"
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shift
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shift
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;;
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-o | --output)
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output_path="$2"
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shift
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shift
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;;
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-f | --format)
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format="$2"
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shift
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shift
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;;
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*)
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echo "Usage: $0 [-p] [-s <source>] [-o <output>] [-f <format>]"
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exit 1
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;;
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esac
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done
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# technical parameters
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width=1408
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height=1872
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bytes_per_pixel=2
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loop_wait="true"
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loglevel="info"
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ssh_cmd() {
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ssh -o ConnectTimeout=1 "$ssh_host" "$@"
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}
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# check if we are able to reach the remarkable
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if ! ssh_cmd true; then
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echo "$ssh_host unreachable"
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exit 1
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fi
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fallback_to_gzip() {
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echo "Falling back to gzip, your experience may not be optimal."
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echo "Go to https://github.com/rien/reStream/#sub-second-latency for a better experience."
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compress="gzip"
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decompress="gzip -d"
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sleep 2
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}
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# check if lz4 is present on remarkable
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if ssh_cmd "[ -f /opt/bin/lz4 ]"; then
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compress="/opt/bin/lz4"
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elif ssh_cmd "[ -f ~/lz4 ]"; then
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compress="\$HOME/lz4"
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fi
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# gracefully degrade to gzip if is not present on remarkable or host
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if [ -z "$compress" ]; then
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echo "Your remarkable does not have lz4."
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fallback_to_gzip
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elif ! lz4 -V; then
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echo "Your host does not have lz4."
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fallback_to_gzip
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else
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decompress="lz4 -d"
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fi
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# list of ffmpeg filters to apply
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video_filters=""
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# store extra ffmpeg arguments in $@
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set --
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# calculate how much bytes the window is
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window_bytes="$((width * height * bytes_per_pixel))"
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# rotate 90 degrees if landscape=true
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$landscape && video_filters="$video_filters,transpose=1"
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# set each frame presentation time to the time it is received
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video_filters="$video_filters,setpts=(RTCTIME - RTCSTART) / (TB * 1000000)"
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# read the first $window_bytes of the framebuffer
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head_fb0="dd if=/dev/fb0 count=1 bs=$window_bytes 2>/dev/null"
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# loop that keeps on reading and compressing, to be executed remotely
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read_loop="while $head_fb0; do $loop_wait; done | $compress"
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set -- "$@" -vf "${video_filters#,}"
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if [ "$output_path" = - ]; then
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output_cmd=ffplay
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else
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output_cmd=ffmpeg
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if [ "$format" != - ]; then
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set -- "$@" -f "$format"
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fi
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set -- "$@" "$output_path"
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fi
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set -e # stop if an error occurs
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# shellcheck disable=SC2086
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ssh_cmd "$read_loop" \
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| $decompress \
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| "$output_cmd" \
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-vcodec rawvideo \
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-loglevel "$loglevel" \
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-f rawvideo \
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-pixel_format gray16le \
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-video_size "$width,$height" \
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-i - \
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"$@"
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