60 lines
1.8 KiB
Bash
60 lines
1.8 KiB
Bash
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#!/bin/bash -ex
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target_url="${1:-srt://127.0.0.1:9000}"
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ffmpeg_pid=
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call_ffmpeg() {
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command ffmpeg -hide_banner "$@"
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}
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daemon_ffmpeg() {
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call_ffmpeg "$@" &
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ffmpeg_pid=$!
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}
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shutdown_ffmpeg() {
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if is_ffmpeg_running
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then
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kill "$ffmpeg_pid"
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wait "$ffmpeg_pid"
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fi
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ffmpeg_pid=
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}
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is_ffmpeg_running() {
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[ -n "$ffmpeg_pid" ] && kill -0 "$ffmpeg_pid"
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}
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on_exit() {
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shutdown_ffmpeg
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}
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trap on_exit EXIT
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while true
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do
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found_audio_source=""
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while read -r line
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do
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declare -a "found_source=($(sed -e 's/"/\\"/g' -e "s/'/\"/g" -e 's/[][`~!@#$%^&*():;<>.,?/\|{}=+-]/\\&/g' <<< "$line"))"
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found_source[0]=$(sed -e 's/\\\([`~!@#$%^&*():;<>.,?/\|{}=+-]\)/\1/g' <<< "${found_source[0]}")
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found_source[1]=$(sed -e 's/\\\([`~!@#$%^&*():;<>.,?/\|{}=+-]\)/\1/g' <<< "${found_source[1]}")
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case "${found_source[0]}" in
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*\(IDHPC\ Main\ Audio\))
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found_audio_source="${found_source[0]}"
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;;
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esac
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done < <(call_ffmpeg -loglevel info -extra_ips 192.168.188.21 -find_sources true -f libndi_newtek -i "dummy" 2>&1 | grep -Po "'(.+)'\s+'(.+)" | tee)
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if ! is_ffmpeg_running && [ -n "$found_audio_source" ]
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then
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echo "starting ffmpeg with audio source: $found_audio_source" >&2
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# HACK - can't use the standard mpegts here, but liquidsoap will happily accept anything ffmpeg can parse (by default)… so let's just use nut here even though it feels super duper wrong
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daemon_ffmpeg -loglevel warning -extra_ips 192.168.188.21 -f libndi_newtek -i "$found_audio_source" -c copy -f nut -write_index false "${target_url}"
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elif is_ffmpeg_running && [ -z "$found_audio_source" ]
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then
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echo "shutting down ffmpeg since no source has been found" >&2
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shutdown_ffmpeg # it won't shut down by itself unfortunately
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fi
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done
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