[linux-dvb] fe status values

[linux-dvb] fe status values

[Markus Oliver Hahn]

Hi there, 
I was just going throug the dvbapi 5.0 
but I couldn`t find ow to interpret the 
values which I get by 



int ioctl( int fd, int request = FE_READ_SIGNAL_STRENGTH, int16_t *strength); 

and 

int ioctl(int fd, int request = FE_READ_SNR, int16_t *snr)

strengt should be (signed) dBm 
and
    0.snr dB

is this right ?


regards markus 


-- 
Neu: GMX FreeDSL Komplettanschluss mit DSL 6.000 Flatrate + Telefonanschluss für nur 17,95 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02

_______________________________________________
linux-dvb users mailing list
For V4L/DVB development, please use instead linux-media@vger.kernel.org
linux-dvb@linuxtv.org
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb

Re: [linux-dvb] fe status values

[Devin Heitmueller]

On Wed, May 27, 2009 at 6:59 AM, Markus Oliver Hahn
<markus.o.hahn@gmx.de> wrote:
> Hi there,
> I was just going throug the dvbapi 5.0
> but I couldn`t find ow to interpret the
> values which I get by
>
>
>
> int ioctl( int fd, int request = FE_READ_SIGNAL_STRENGTH, int16_t *strength);
>
> and
>
> int ioctl(int fd, int request = FE_READ_SNR, int16_t *snr)
>
> strengt should be (signed) dBm
> and
>    0.snr dB
>
> is this right ?
>
>
> regards markus
>
>
> --
> Neu: GMX FreeDSL Komplettanschluss mit DSL 6.000 Flatrate + Telefonanschluss für nur 17,95 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02
>
> _______________________________________________
> linux-dvb users mailing list
> For V4L/DVB development, please use instead linux-media@vger.kernel.org
> linux-dvb@linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>

Hello Markus,

Unfortunately, there is currently no standard way in which the return
values can be interpreted.  The content varies by demodulator.  This
has been discussed at length on the linux-media ML if you want to read
the back history.

Regards,

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com

Re: [linux-dvb] fe status values

[Manu Abraham]

On Wed, May 27, 2009 at 2:59 PM, Markus Oliver Hahn
<markus.o.hahn@gmx.de> wrote:
> Hi there,
> I was just going throug the dvbapi 5.0
> but I couldn`t find ow to interpret the
> values which I get by
>
>
>
> int ioctl( int fd, int request = FE_READ_SIGNAL_STRENGTH, int16_t *strength);
>
> and
>
> int ioctl(int fd, int request = FE_READ_SNR, int16_t *snr)
>
> strengt should be (signed) dBm
> and
>    0.snr dB
>
> is this right ?


dB scale is not something that which is supported by the API specification.
Mostly the scale, it depends on the implementation in the various drivers.
Which driver are you looking at ?

Something, that compliant in accordance:
http://linuxtv.org/hg/dvb-apps/file/9655c8cfeed8/util/szap/README

Regards,
Manu

_______________________________________________
linux-dvb users mailing list
For V4L/DVB development, please use instead linux-media@vger.kernel.org
linux-dvb@linuxtv.org
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb