func WaitForTune(fe frontend.Device, deadline time.Time, debug bool) error {
fe3 := frontend.API3{fe}
var ev frontend.Event
for ev.Status()&frontend.HasLock == 0 {
timedout, err := fe3.WaitEvent(&ev, deadline)
if err != nil {
return err
}
if timedout {
return errors.New("tuning timeout")
}
if debug {
log.Println(ev.Status())
}
}
return nil
}
func main() {
fpath := flag.String(
"front", "/dev/dvb/adapter0/frontend0",
"path to the frontend device",
)
dmxpath := flag.String(
"demux", "/dev/dvb/adapter0/demux0",
"path to the demux device",
)
sys := flag.String(
"sys", "t",
"delivery system type: t, s, s2, ca, cb, cc",
)
freq := flag.Float64(
"freq", 0,
"frequency [Mhz]",
)
sr := flag.Uint(
"sr", 0,
"symbol rate [kBd]",
)
pol := flag.String(
"pol", "h",
"polarization: h, v",
)
bw := flag.Uint(
"bw", 0,
"bandwidth [MHz] (default 0 means automatic - not supported by many tuners)",
)
flag.Usage = usage
flag.Parse()
if flag.NArg() == 0 {
usage()
}
pids := make([]int16, flag.NArg())
for i, a := range flag.Args() {
pid, err := strconv.ParseInt(a, 0, 64)
checkErr(err)
if uint64(pid) > 8192 {
die(a + " isn't in valid PID range [0, 8192]")
}
pids[i] = int16(pid)
}
fe, err := internal.Tune(*fpath, *sys, *pol, int64(*freq*1e6), int(*bw*1e6), *sr*1e3)
checkErr(err)
checkErr(internal.WaitForTune(fe, time.Now().Add(15*time.Second), true))
filterParam := demux.StreamFilterParam{
Pid: pids[0],
In: demux.InFrontend,
Out: demux.OutTSTap,
Type: demux.Other,
}
filter, err = demux.Device(*dmxpath).NewStreamFilter(&filterParam)
for _, pid := range pids[1:] {
checkErr(filter.AddPid(pid))
}
checkErr(err)
checkErr(filter.Start())
var rssi, snr, ber, ublk string
for {
fe3 := frontend.API3{fe}
if rssi != "-" {
val, err := fe3.SignalStrength()
if err != nil {
if e, ok := err.(frontend.Error); ok && e.What == "rssi" {
rssi = "-"
} else {
die(err.Error())
}
} else {
rssi = strconv.FormatInt(int64(val), 10)
}
}
if snr != "-" {
val, err := fe3.SNR()
if err != nil {
if e, ok := err.(frontend.Error); ok && e.What == "snr" {
snr = "-"
} else {
die(err.Error())
}
} else {
snr = strconv.FormatInt(int64(val), 10)
}
}
if ber != "-" {
val, err := fe3.BER()
if err != nil {
if e, ok := err.(frontend.Error); ok && e.What == "ber" {
ber = "-"
} else {
die(err.Error())
}
} else {
ber = strconv.FormatInt(int64(val), 10)
}
}
if ublk != "-" {
val, err := fe3.UncorrectedBlocks()
if err != nil {
if e, ok := err.(frontend.Error); ok && e.What == "uncorrected_blocks" {
ublk = "-"
} else {
die(err.Error())
}
} else {
ublk = strconv.FormatUint(uint64(val), 10)
}
}
log.Printf("API3 RSSI: %s SNR: %s BER: %s UBLK: %s", rssi, snr, ber, ublk)
s, err := fe.Stat()
checkErr(err)
log.Printf(
"API5 Sig: %v CNR: %v PreIFEC: %v/%v bit/bit PostIFEC: %v/%v bit/bit PostOFEC %v/%v blk/blk\n",
s.Signal, s.CNR, s.PreErrBit, s.PreTotBit, s.PostErrBit, s.PostTotBit, s.ErrBlk, s.TotBlk)
time.Sleep(2 * time.Second)
}
}