iankelling.org Git - distro-setup/blob - ffs

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to change
   7 # to a recommended GPL license.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23 # ffs = ffmpeg stream
  24
  25 # todo: figure out how to record mumble
  26 # todo: get icecast on li.b8.nz
  27 # todo: https://superuser.com/questions/1106674/how-to-add-blank-lines-above-the-bottom-in-terminal
  28
  29 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  30 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  31 set -eE -o pipefail
  32 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
  33
  34
  35 # 3 mountpoints: fsf-sysops (public), fsf (default, all staff), fsf-tech (tech team)
  36 case $1 in
  37   sysops|tech)
  38     mount_suffix=-$1
  39     ;;
  40 esac
  41
  42 host=live.iankelling.org:8000
  43 if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
  44      && ip n show 10.2.0.1 | grep . &>/dev/null; then
  45   host=127.0.0.1:8000
  46 fi
  47
  48 pass=$(sed -n 's/ *<source-password>\([^<]*\).*/\1/p' /p/c/icecast.xml)
  49
  50
  51 tmpf=$(mktemp)
  52 xrandr >$tmpf
  53
  54 # example xrandr output: 1280x800+0+0
  55 primary_res=$(awk '$2 == "connected" && $3 == "primary" { print $4 }' $tmpf | sed 's/+.*//')
  56 secondary_res=$(awk '$2 == "connected" && $3 != "primary" { print $3 }' $tmpf | sed 's/+.*//')
  57
  58 if [[ $secondary_res ]]; then
  59   # assumes secondary is on the right
  60   x_offset=${primary_res%%x*}
  61   secondary_x=${secondary_res%%x*}
  62   secondary_y=${secondary_res##*x}
  63   stream_res=$(( secondary_x / 2 ))x$(( secondary_y / 2))
  64 else
  65   x_offset=0
  66   stream_res=$primary_res
  67 fi
  68
  69
  70 opts=(
  71   # nice to have: be a little less verbose
  72   -hide_banner
  73   -video_size $stream_res
  74   -f x11grab
  75   -framerate 4
  76   # input options come before -i
  77   -i :0.0+$x_offset.0
  78   -vf drawbox=color=black
  79   -vcodec libvpx
  80   -g 8
  81   -quality realtime
  82   -threads 2
  83   -error-resilient 1
  84   -content_type video/webm
  85   -f webm
  86   icecast://source:$pass@$host/fsf$mount_suffix.webm
  87
  88 )
  89
  90
  91 rm -f /tmp/iank-ffmpeg
  92 mkfifo -m 0600 /tmp/iank-ffmpeg
  93 echo executing: ffmpeg -stdin ${opts[@]}
  94 # ffmpeg sits and waits until we do this. dunno why. whatever.
  95 echo >/tmp/iank-ffmpeg &
  96 ffmpeg ${opts[@]} </tmp/iank-ffmpeg