81 lines
2.5 KiB
Bash
81 lines
2.5 KiB
Bash
#!/bin/bash -e
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target_url="${1:-icecast://source:source@127.0.0.1:61120/main}"
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ffmpeg_pids=()
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call_ffmpeg() {
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command ffmpeg -hide_banner "$@"
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}
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daemon_ffmpeg() {
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call_ffmpeg "$@" &
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ffmpeg_pids+=($!)
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}
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shutdown_ffmpeg() {
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if is_ffmpeg_running; then
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kill "$ffmpeg_pid" || true
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for t in $(seq 0 10); do
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if ! kill -0 "$ffmpeg_pid"; then
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break
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fi
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sleep 1
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done
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if kill -0 "$ffmpeg_pid"; then
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kill -9 "$ffmpeg_pid" || true
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fi
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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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offline=0
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while true; do
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found_audio_source=""
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while read -r line; 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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*\(ID*\ Main\ Audio\))
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found_audio_source="${found_source[0]}"
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;;
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esac
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done < <(call_ffmpeg -loglevel info -extra_ips 192.168.188.21 -find_sources true -f libndi_newtek -i "dummy" 2>&1 | grep -Po "'(.+)'\s+'(.+)" | tee)
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if [ -z "$found_audio_source" ]; then
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offline=$((offline + 1))
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else
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offline=0
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fi
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if ! is_ffmpeg_running && [ -n "$found_audio_source" ]; then
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echo "starting ffmpeg with audio source: $found_audio_source" >&2
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call_ffmpeg -loglevel warning \
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-analyzeduration 1 -f libndi_newtek -extra_ips 192.168.188.21 -i "$found_audio_source" \
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-map a -c:a pcm_s16le -ar 48000 -ac 2 -f s16le - |
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fakesilence --samplerate 48000 --channels 2 --silence-threshold 125ms |
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daemon_ffmpeg -loglevel warning \
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-ar 48000 -channels 2 -f s16le -i - \
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-map a -c:a flac -f ogg -content_type application/ogg "${target_url}"
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# HACK - can't use the standard mpegts here, but liquidsoap will happily accept anything ffmpeg can parse (by default)… so let's just use nut here even though it feels super duper wrong
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elif is_ffmpeg_running && [ -z "$found_audio_source" ] && [ "$offline" -gt 0 ]; 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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sleep 1
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done
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