func main() {
fe, err := frontend.Open("/dev/dvb/adapter0/frontend0")
checkErr(err)
checkErr(fe.SetDeliverySystem(dvb.SysDVBT))
checkErr(fe.SetFrequency(778e6))
checkErr(fe.SetBandwidth(8e6))
checkErr(fe.SetCodeRateHP(dvb.FECAuto))
checkErr(fe.SetCodeRateLP(dvb.FECAuto))
checkErr(fe.SetTxMode(dvb.TxModeAuto))
checkErr(fe.SetGuard(dvb.GuardAuto))
checkErr(fe.SetHierarchy(dvb.HierarchyNone))
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 {
log.Fatal("tuning timeout")
}
log.Println(ev.Status())
}
log.Println("tuned!")
}
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() {
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)
}
}