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|
#!/usr/bin/env bash
# tnc1_high_snr.sh
#
# HF TNC use case test 1
# + Send unidirectional frames at high SNR over an alsa loopback virtual sound card
# + Using the sound card can take some time, so implemented as a service to run automatically in background
NAME=tnc1
CODEC2_PATH=${HOME}/codec2
PIDFILE_TX=/tmp/${NAME}_tx.pid
PIDFILE_RX=/tmp/${NAME}_rx.pid
LOGFILE=${NAME}.log
PATH=${CODEC2_PATH}/build_linux/src:${PATH}
DELAY="${DELAY:-500}"
MAX_RUN_TIME=3600
# we use single frame bursts, so BURSTS==FRAME
BURSTS=$2
function run_tx {
bursts=$1
delay=$2
freedv_data_raw_tx DATAC0 /dev/zero - --testframes ${bursts} --bursts ${bursts} --delay ${delay} | aplay --device="plughw:CARD=CHAT2,DEV=1" -f S16_LE
}
function start_rx_background {
arecord --device="plughw:CARD=CHAT2,DEV=0" -f S16_LE -d $MAX_RUN_TIME | freedv_data_raw_rx DATAC0 - /dev/null --framesperburst 1 --vv --testframes &
echo $!>${PIDFILE_RX}
}
function stop_service {
echo "service stopping - bye!" 1>&2
if [ -e ${PIDFILE_RX} ]; then
pid_rx=$(cat ${PIDFILE_RX})
rm ${PIDFILE_RX}
kill ${pid_rx}
fi
if [ -e ${PIDFILE_TX} ]; then
pid_tx=$(cat ${PIDFILE_TX})
rm ${PIDFILE_TX}
kill ${pid_tx}
fi
}
function check_running {
if [ -e ${PIDFILE_TX} ]; then
echo "Tx already running... pid: ${PIDFILE_TX}"
exit 1
fi
if [ -e ${PIDFILE_RX} ]; then
echo "Rx already running... pid: ${PIDFILE_RX}"
exit 1
fi
}
function check_alsa_loopback {
lsmod | grep snd_aloop >> /dev/null
if [ $? -eq 1 ]; then
echo "ALSA loopback device not present. Please install with:"
echo
echo " sudo modprobe snd-aloop index=1,2 enable=1,1 pcm_substreams=1,1 id=CHAT1,CHAT2"
exit 1
fi
}
case "$1" in
start)
check_running
check_alsa_loopback
( start_rx_background && sleep 1 && run_tx ${BURSTS} ${DELAY} && stop_service ) 2>${LOGFILE} &
echo $!>${PIDFILE_TX}
echo "Results in ${LOGFILE}"
;;
start_verbose)
set -x
check_running
check_alsa_loopback
# Show all outputs and log output to stderr rather than logfile
verbose=1
start_rx_background && sleep 1 && run_tx ${BURSTS} ${DELAY} && stop_service
;;
stop)
stop_service
;;
restart)
$0 stop
$0 start
;;
status)
if [ -e ${PIDFILE_TX} ]; then
echo ${NAME} is running, pid=`cat ${PIDFILE_TX}`
else
echo ${NAME} is NOT running
exit 1
fi
;;
*)
echo "Usage: $0 {start|start_verbose|stop|restart|status} NumFrames"
echo " $0 start_verbose 1 - 1 frame packet verbose, logs to stderr"
echo " $0 start 5 - 5 frames, run as service in background, logs sent to ${LOGFILE}"
esac
exit 0
|
