242 lines
8.7 KiB
Bash
Executable File
242 lines
8.7 KiB
Bash
Executable File
#!/system/bin/sh
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# RTL-SDR Mode Switcher
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# Switches between DVB-T (digital TV), FM Radio, and SDR scanner modes
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# Manages the userspace process that controls the RTL-SDR dongle
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#
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# Only one mode can use the dongle at a time. This script kills
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# the active process before starting a new one.
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MODDIR="/data/adb/modules/driver-manager"
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CONFDIR="$MODDIR/config"
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LOGFILE="$MODDIR/driver-manager.log"
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PIDDIR="$MODDIR/run"
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STREAMDIR="$MODDIR/streams"
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TERMUX="/data/data/com.termux/files/usr/bin"
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RTL_TCP="$TERMUX/rtl_tcp"
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RTL_FM="$TERMUX/rtl_fm"
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RTL_ADSB="$TERMUX/rtl_adsb"
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RTL_POWER="$TERMUX/rtl_power"
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HACKRF="$TERMUX/hackrf_transfer"
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mkdir -p "$PIDDIR" "$STREAMDIR"
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mlog() {
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echo "$(date '+%Y-%m-%d %H:%M:%S') [rtl_switch] $1" >> "$LOGFILE"
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}
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# Kill any running RTL process that holds the dongle
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kill_rtl() {
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for pidfile in "$PIDDIR"/rtl_*.pid; do
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[ -f "$pidfile" ] || continue
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PID=$(cat "$pidfile")
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if [ -n "$PID" ] && kill -0 "$PID" 2>/dev/null; then
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kill "$PID" 2>/dev/null
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sleep 1
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kill -9 "$PID" 2>/dev/null
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mlog "Killed PID $PID ($(basename "$pidfile" .pid))"
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fi
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rm -f "$pidfile"
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done
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# Also catch any strays — both real and stealth names
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pkill -f rtl_tcp 2>/dev/null
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pkill -f rtl_fm 2>/dev/null
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pkill -f rtl_adsb 2>/dev/null
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pkill -f rtl_power 2>/dev/null
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pkill -f dvbt_rx 2>/dev/null
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pkill -f sdr_tv 2>/dev/null
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sleep 1
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}
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# Start rtl_tcp server — base layer for all modes
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# Apps connect to localhost:1234 for I/Q data
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start_rtl_tcp() {
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PORT=$(cat "$CONFDIR/rtl_tcp_port" 2>/dev/null || echo "1234")
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GAIN=$(cat "$CONFDIR/rtl_gain" 2>/dev/null || echo "0")
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SRATE=$(cat "$CONFDIR/rtl_samplerate" 2>/dev/null || echo "2048000")
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FREQ=$(cat "$CONFDIR/rtl_freq" 2>/dev/null || echo "100000000")
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if [ -x "$RTL_TCP" ]; then
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"$RTL_TCP" -a 127.0.0.1 -p "$PORT" -f "$FREQ" -s "$SRATE" -g "$GAIN" &
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echo $! > "$PIDDIR/rtl_tcp.pid"
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mlog "rtl_tcp started on port $PORT (freq=$FREQ srate=$SRATE gain=$GAIN)"
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else
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mlog "ERROR: rtl_tcp not found — install in Termux: pkg install rtl-sdr"
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return 1
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fi
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}
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MODE="$1"
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[ -z "$MODE" ] && MODE=$(cat "$CONFDIR/rtl_mode" 2>/dev/null || echo "off")
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case "$MODE" in
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# =================================================================
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# DVB-T Digital TV Mode
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# =================================================================
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# Receives DVB-T signal, outputs MPEG-TS stream
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# Stream is served via HTTP on port 8554 for Kodi to consume
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dvbt)
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kill_rtl
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FREQ=$(cat "$CONFDIR/dvbt_freq" 2>/dev/null || echo "506000000")
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BW=$(cat "$CONFDIR/dvbt_bandwidth" 2>/dev/null || echo "8")
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TXMODE=$(cat "$CONFDIR/dvbt_txmode" 2>/dev/null || echo "8k")
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CONSTELLATION=$(cat "$CONFDIR/dvbt_constellation" 2>/dev/null || echo "64qam")
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CODERATE=$(cat "$CONFDIR/dvbt_coderate" 2>/dev/null || echo "2/3")
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GUARD=$(cat "$CONFDIR/dvbt_guard" 2>/dev/null || echo "1/32")
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KODI_PORT=$(cat "$CONFDIR/kodi_stream_port" 2>/dev/null || echo "8554")
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# Use the sdr_tv.py DVB-T receiver if available
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SDR_TV="$MODDIR/scripts/sdr_tv.py"
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DVBT_RX="$MODDIR/scripts/dvbt_rx.py"
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if [ -x "$TERMUX/python3" ] && [ -f "$SDR_TV" ]; then
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# Pipe MPEG-TS to a local HTTP server for Kodi
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# Using socat or a simple netcat HTTP wrapper
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FIFO="$STREAMDIR/dvbt.ts"
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rm -f "$FIFO"
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mkfifo "$FIFO" 2>/dev/null
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# Start DVB-T receiver, output MPEG-TS to FIFO
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"$TERMUX/python3" "$SDR_TV" dvbt \
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--freq "$FREQ" \
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--bandwidth "$BW" \
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--transmission-mode "$TXMODE" \
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--constellation "$CONSTELLATION" \
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--code-rate "$CODERATE" \
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--guard-interval "$GUARD" \
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> "$FIFO" 2>>"$LOGFILE" &
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echo $! > "$PIDDIR/rtl_dvbt.pid"
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# HTTP stream server — serves MPEG-TS on port for Kodi
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# Kodi connects to http://127.0.0.1:8554/dvbt.ts
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(while true; do
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cat "$FIFO" | {
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read -r _ # wait for connection
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echo -e "HTTP/1.1 200 OK\r\nContent-Type: video/mp2t\r\nConnection: close\r\n\r"
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cat
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} | nc -l -p "$KODI_PORT" 2>/dev/null
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done) &
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echo $! > "$PIDDIR/rtl_dvbt_http.pid"
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mlog "DVB-T started: freq=$FREQ bw=${BW}MHz mode=$TXMODE"
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mlog "Kodi stream: http://127.0.0.1:$KODI_PORT"
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elif [ -x "$TERMUX/rtl_tcp" ]; then
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# Fallback: just start rtl_tcp, let an Android DVB app handle it
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echo "$FREQ" > "$CONFDIR/rtl_freq"
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start_rtl_tcp
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mlog "DVB-T fallback: rtl_tcp on port 1234, use SDR Touch or rtl_tcp_andro"
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else
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mlog "ERROR: no DVB-T tools found"
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fi
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echo "dvbt" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# FM Radio Mode
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# =================================================================
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fm)
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kill_rtl
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FREQ=$(cat "$CONFDIR/fm_freq" 2>/dev/null || echo "100000000")
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GAIN=$(cat "$CONFDIR/rtl_gain" 2>/dev/null || echo "0")
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if [ -x "$TERMUX/rtl_fm" ]; then
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# Demodulate FM and pipe to audio output
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"$TERMUX/rtl_fm" -f "$FREQ" -M wbfm -s 200000 -r 48000 -g "$GAIN" - 2>>"$LOGFILE" | \
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"$TERMUX/play" -r 48000 -b 16 -c 1 -e signed-integer -t raw - 2>/dev/null &
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echo $! > "$PIDDIR/rtl_fm.pid"
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mlog "FM radio started: freq=$FREQ gain=$GAIN"
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else
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mlog "ERROR: rtl_fm not found — install in Termux: pkg install rtl-sdr"
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fi
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echo "fm" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# SDR Scanner Mode
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# =================================================================
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# Starts rtl_tcp server for any SDR app to connect
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sdr)
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kill_rtl
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start_rtl_tcp
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echo "sdr" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# ADS-B Aircraft Tracking
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# =================================================================
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adsb)
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kill_rtl
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if [ -x "$TERMUX/rtl_adsb" ]; then
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"$TERMUX/rtl_adsb" -g 50 > "$STREAMDIR/adsb_output.txt" 2>>"$LOGFILE" &
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echo $! > "$PIDDIR/rtl_adsb.pid"
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mlog "ADS-B tracking started (1090 MHz)"
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else
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mlog "ERROR: rtl_adsb not found"
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fi
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echo "adsb" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# Spectrum Scanner
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# =================================================================
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spectrum)
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kill_rtl
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RANGE=$(cat "$CONFDIR/spectrum_range" 2>/dev/null || echo "24M:1800M")
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if [ -x "$TERMUX/rtl_power" ]; then
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"$TERMUX/rtl_power" -f "$RANGE" -g 50 -i 1 "$STREAMDIR/spectrum_data.csv" 2>>"$LOGFILE" &
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echo $! > "$PIDDIR/rtl_spectrum.pid"
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mlog "Spectrum scan started: $RANGE"
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else
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mlog "ERROR: rtl_power not found"
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fi
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echo "spectrum" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# HackRF TX/RX Mode
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# =================================================================
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hackrf)
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kill_rtl
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# HackRF uses its own USB interface, doesn't conflict with RTL-SDR
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# Just set the mode flag — apps handle the rest
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mlog "HackRF mode set — use hackrf_transfer or rtl_tcp_andro"
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echo "hackrf" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# Off
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# =================================================================
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off)
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kill_rtl
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mlog "All SDR processes stopped"
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echo "off" > "$CONFDIR/rtl_mode"
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;;
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# =================================================================
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# Status
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# =================================================================
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status)
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CURRENT=$(cat "$CONFDIR/rtl_mode" 2>/dev/null || echo "off")
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echo "Mode: $CURRENT"
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for pidfile in "$PIDDIR"/rtl_*.pid; do
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[ -f "$pidfile" ] || continue
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PID=$(cat "$pidfile")
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NAME=$(basename "$pidfile" .pid)
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if kill -0 "$PID" 2>/dev/null; then
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echo " $NAME: running (PID $PID)"
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else
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echo " $NAME: dead"
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fi
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done
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;;
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*)
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echo "Usage: rtl_mode_switch.sh {dvbt|fm|sdr|adsb|spectrum|hackrf|off|status}"
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exit 1
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;;
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esac
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