func Tune(fpath, sys, pol string, freqHz int64, bwHz int, srBd uint) (fe frontend.Device, err error) {
var polar rune
switch pol {
case "h", "v":
polar = rune((pol)[0])
default:
err = errors.New("unknown polarization: " + pol)
return
}
fe, err = frontend.Open(fpath)
if err != nil {
return
}
switch sys {
case "t":
if err = fe.SetDeliverySystem(dvb.SysDVBT); err != nil {
return
}
if err = fe.SetModulation(dvb.QAMAuto); err != nil {
return
}
if err = fe.SetFrequency(uint32(freqHz)); err != nil {
return
}
if err = fe.SetInversion(dvb.InversionAuto); err != nil {
return
}
if bwHz != 0 {
if err = fe.SetBandwidth(uint32(bwHz)); err != nil {
return
}
}
if err = fe.SetCodeRateHP(dvb.FECAuto); err != nil {
return
}
if err = fe.SetCodeRateLP(dvb.FECAuto); err != nil {
return
}
if err = fe.SetTxMode(dvb.TxModeAuto); err != nil {
return
}
if err = fe.SetGuard(dvb.GuardAuto); err != nil {
return
}
if err = fe.SetHierarchy(dvb.HierarchyNone); err != nil {
return
}
case "s", "s2":
if sys == "s" {
if err = fe.SetDeliverySystem(dvb.SysDVBS); err != nil {
return
}
if err = fe.SetModulation(dvb.QPSK); err != nil {
return
}
} else {
if err = fe.SetDeliverySystem(dvb.SysDVBS2); err != nil {
return
}
if err = fe.SetModulation(dvb.PSK8); err != nil {
return
}
if err = fe.SetRolloff(dvb.RolloffAuto); err != nil {
return
}
if err = fe.SetPilot(dvb.PilotAuto); err != nil {
return
}
}
if err = fe.SetSymbolRate(uint32(srBd)); err != nil {
return
}
if err = fe.SetInnerFEC(dvb.FECAuto); err != nil {
return
}
if err = fe.SetInversion(dvb.InversionAuto); err != nil {
return
}
ifreq, tone, volt := frontend.SecParam(freqHz, polar)
if err = fe.SetFrequency(ifreq); err != nil {
return
}
if err = fe.SetTone(tone); err != nil {
return
}
if err = fe.SetVoltage(volt); err != nil {
return
}
case "ca", "cb", "cc":
switch sys {
case "ca":
err = fe.SetDeliverySystem(dvb.SysDVBCAnnexA)
case "cb":
err = fe.SetDeliverySystem(dvb.SysDVBCAnnexB)
case "cc":
err = fe.SetDeliverySystem(dvb.SysDVBCAnnexC)
}
if err != nil {
return
}
if err = fe.SetModulation(dvb.QAMAuto); err != nil {
return
}
if err = fe.SetFrequency(uint32(freqHz)); err != nil {
return
}
if err = fe.SetInversion(dvb.InversionAuto); err != nil {
return
}
if err = fe.SetSymbolRate(uint32(srBd)); err != nil {
return
}
if err = fe.SetInnerFEC(dvb.FECAuto); err != nil {
return
}
default:
err = errors.New("unknown delivery system: " + sys)
return
}
err = fe.Tune()
return
}
func main() {
adapterPath := flag.String(
"a", "/dev/dvb/adapter0",
"path to the adapter directory",
)
frontendPath := flag.String(
"f", "frontend0",
"frontend path, relative to the adapter directory",
)
demuxPath := flag.String(
"d", "demux0",
"demux path, relative to the adapter directory",
)
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) < 4 {
usage()
os.Exit(1)
}
freq, err := strconv.ParseInt(args[0], 0, 64)
checkErr(err)
freq *= 1e6
var polar byte
switch args[1] {
case "v", "V":
polar = 'v'
case "h", "H":
polar = 'h'
default:
die("wrong polarisation: " + args[1])
}
sr, err := strconv.ParseUint(args[2], 0, 32)
checkErr(err)
args = args[3:]
pids := make([]int16, len(args))
for i, a := range 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 := frontend.Open(filepath.Join(*adapterPath, *frontendPath))
checkErr(err)
checkErr(fe.SetDeliverySystem(dvb.SysDVBS2))
checkErr(fe.SetModulation(dvb.PSK8))
checkErr(fe.SetRolloff(dvb.RolloffAuto))
checkErr(fe.SetPilot(dvb.PilotAuto))
checkErr(fe.SetSymbolRate(uint32(sr * 1e3)))
checkErr(fe.SetInnerFEC(dvb.FECAuto))
checkErr(fe.SetInversion(dvb.InversionAuto))
ifreq, tone, volt := frontend.SecParam(freq, rune(polar))
checkErr(fe.SetFrequency(ifreq))
checkErr(fe.SetTone(tone))
checkErr(fe.SetVoltage(volt))
checkErr(fe.Tune())
deadline := time.Now().Add(5 * time.Second)
var ev frontend.Event
for ev.Status()&frontend.HasLock == 0 {
timedout, err := frontend.API3{fe}.WaitEvent(&ev, deadline)
checkErr(err)
if timedout {
die("tuning timeout")
}
fmt.Fprintln(os.Stderr, ev.Status())
}
fmt.Fprintln(os.Stderr, "tuned!")
dmx := demux.Device(filepath.Join(*adapterPath, *demuxPath))
f, err := dmx.NewStreamFilter(
&demux.StreamFilterParam{
Pid: pids[0],
In: demux.InFrontend,
Out: demux.OutTSDemuxTap,
Type: demux.Other,
},
)
checkErr(err)
defer f.Close()
for _, pid := range pids[1:] {
checkErr(f.AddPid(pid))
}
checkErr(f.SetBufferSize(1024 * ts.PktLen))
checkErr(f.Start())
r := ts.NewPktStreamReader(f)
pkt := new(ts.ArrayPkt)
for {
t := time.Now()
n := 4000
for i := 0; i < n; i++ {
checkErr(r.ReadPkt(pkt))
}
dt := time.Now().Sub(t)
pps := time.Duration(n) * time.Second / dt
fmt.Printf("%d pkt/s (%d kb/s)\n", pps, pps*ts.PktLen*8/1000)
}
}