#!/bin/bash

exit_handler() {
        rm /tmp/rtl_fm
        pkill -KILL -P $$
}

trap "exit_handler" SIGINT SIGTERM SIGKILL

RTL_FM=/opt/rtl-sdr/bin/rtl_fm
FFMPEG=/opt/ffmpeg/bin/ffmpeg

$RTL_FM -X -f $1M > /tmp/rtl_fm &

while [ ! `stat -c %s /tmp/rtl_fm` -ge 64 ]
do
        sleep 0.1
done

$FFMPEG -re -f s16le -ac 2 -ar 48000 -i pipe:0 \
-vcodec none -acodec ac3 -ac 2 -ab 224k -ar 48000 \
-metadata service_name="$2" -mpegts_service_type digital_radio \
-f mpegts pipe:1 < /tmp/rtl_fm &

wait