Ejemplo n.º 1
0
Archivo: filter.go Proyecto: ziutek/dvb
func setFilter(dmxpath, dvrpath string, pids []int16) (ts.PktReader, demux.StreamFilter) {
	filterParam := demux.StreamFilterParam{
		Pid:  pids[0],
		In:   demux.InFrontend,
		Out:  demux.OutTSDemuxTap,
		Type: demux.Other,
	}
	if dvrpath != "" {
		filterParam.Out = demux.OutTSTap
	}
	filter, err := demux.Device(dmxpath).NewStreamFilter(&filterParam)
	checkErr(err)
	for _, pid := range pids[1:] {
		checkErr(filter.AddPid(pid))
	}
	if dvrpath == "" {
		checkErr(filter.SetBufferSize(1024 * 188))
		checkErr(filter.Start())
		return ts.NewPktStreamReader(filter), filter
	}
	dvr, err := os.Open(dvrpath)
	checkErr(err)
	checkErr(filter.Start())
	return ts.NewPktStreamReader(dvr), filter
}
Ejemplo n.º 2
0
Archivo: main.go Proyecto: ziutek/dvb
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)
	}
}
Ejemplo n.º 3
0
Archivo: main.go Proyecto: ziutek/dvb
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)
	}
}