[linux-dvb] [PATCH] wscan: improved frontend autodetection

[linux-dvb] [PATCH] wscan: improved frontend autodetection

[Hans Werner]

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Currently wscan will not autodetect frontends which which have frontend != 0,
i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.

Since multiple frontends per adapter are supported in 2.6.28, this means the correct
frontend may not be found. For example with the HVR4000, DVB-T is always at frontend1.

The attached patch fixes this, searching for frontend 0-3 for each adapter 0-3.

Signed-off-by: Hans Werner <hwerner4@gmx.de>.


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[-- Attachment #2: patch_wscan_fixautodetection.diff --]
[-- Type: text/x-patch, Size: 1858 bytes --]

diff -Nur w_scan-20080815/scan.c w_scan-20080815_fixautodetection/scan.c
--- w_scan-20080815/scan.c	2008-08-16 09:02:01.000000000 +0100
+++ w_scan-20080815_fixautodetection/scan.c	2008-11-06 12:24:40.000000000 +0000
@@ -2579,7 +2579,7 @@
 {
 	char frontend_devname [80];
 	int adapter = 999, frontend = 0, demux = 0;
-	int opt, i;
+	int opt, i, j;
 	int frontend_fd;
 	int fe_open_mode;
 	int frontend_type = FE_OFDM;
@@ -2716,18 +2716,19 @@
 		info("Info: using DVB adapter auto detection.\n");
 		fe_open_mode = O_RDWR | O_NONBLOCK;
 		for (i=0; i < 4; i++) {
-		  snprintf (frontend_devname, sizeof(frontend_devname),  		"/dev/dvb/adapter%i/frontend0", i);
-		  if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
+		  for (j=0; j < 4; j++) {
+		    snprintf (frontend_devname, sizeof(frontend_devname), "/dev/dvb/adapter%i/frontend%i", i, j);
+		    if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
 		  	info("Info: unable to open frontend %s'\n", frontend_devname);
 			continue;
 			}
-		/* determine FE type and caps */
-		if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
+		    /* determine FE type and caps */
+		    if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
 			info("   ERROR: unable to determine frontend type\n");
 			close (frontend_fd);
 			continue;
-			}		  
-		if (fe_info.type==frontend_type) {
+			}
+		    if (fe_info.type == frontend_type) {
 			if (fe_info.type == FE_OFDM) 
 			  info("   Found DVB-T frontend. Using adapter %s\n",frontend_devname);
                         else if (fe_info.type == FE_ATSC)
@@ -2736,9 +2737,11 @@
 			  info("   Found DVB-C frontend. Using adapter %s\n",frontend_devname);                     
 			close (frontend_fd);
 			adapter=i;
+			frontend=j;
 			break;
-			} 		
+			}
 
+		  }
 		}
 	}
 	snprintf (frontend_devname, sizeof(frontend_devname),

[-- Attachment #3: Type: text/plain, Size: 150 bytes --]

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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[Hans Werner]

> Currently wscan will not autodetect frontends which which have frontend !=
> 0,
> i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.
> 
> Since multiple frontends per adapter are supported in 2.6.28, this means
> the correct
> frontend may not be found. For example with the HVR4000, DVB-T is always
> at frontend1.
> 
> The attached patch fixes this, searching for frontend 0-3 for each adapter
> 0-3.
> 
> Signed-off-by: Hans Werner <hwerner4@gmx.de>.

Of course it's called w_scan, not wscan, sorry.

Suggestion: how about setting -t 3 (long tuning timeout) and -O 1 (search other services)
as the *default* options to give the program the best chance of finding all channels without
having to play with the options? They do make a difference.

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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[wk]

[-- Attachment #1: Type: text/plain, Size: 1659 bytes --]

Hi,

Hans Werner wrote:
> Currently wscan will not autodetect frontends which which have frontend != 0,
> i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.
>
> Since multiple frontends per adapter are supported in 2.6.28, this means the correct
> frontend may not be found. For example with the HVR4000, DVB-T is always at frontend1.
>
> The attached patch fixes this, searching for frontend 0-3 for each adapter 0-3.
>
> Signed-off-by: Hans Werner <hwerner4@gmx.de>
Good idea. :)
But while testing your patch it seems that it doesn't work as expected. 
Here some example:

w_scan version 20081106
Info: using DVB adapter auto detection.
   Found DVB-C frontend. Using adapter /dev/dvb/adapter0/frontend0
   Found DVB-C frontend. Using adapter /dev/dvb/adapter1/frontend0
   Found DVB-C frontend. Using adapter /dev/dvb/adapter2/frontend0
Info: unable to open frontend /dev/dvb/adapter3/frontend1'
Info: unable to open frontend /dev/dvb/adapter3/frontend2'
Info: unable to open frontend /dev/dvb/adapter3/frontend3'
-_-_-_-_ Getting frontend capabilities-_-_-_-_

I'm using three dvb-c frontends.
The detection doesnt stop anymore with your patch if a matching frontend 
was found, because it doesnt leave the outer loop.
Normally this search has to stop at /dev/dvb/adapter0/frontend0.
That means we have to change your patch a little. I also increased the 
number of adapters to 8, since i use more than 4.

Can you please test the attached patch and give some feedback? If it 
works fine for you, i would apply to w_scan.

-Winfried

PS: What is actually the maximum number of adapters and frontends per 
adapter? Can anybody give some hint?



[-- Attachment #2: patch_wscan_fixautodetection2.diff --]
[-- Type: text/plain, Size: 2082 bytes --]

--- w_scan-20080815/scan.c	2008-09-09 19:21:36.698571084 +0200
+++ w_scan-20081106/scan.c	2008-11-06 17:28:19.720159563 +0100
@@ -77,7 +77,7 @@
 	.type = -1
 };
 
-uint version = 20080815;
+uint version = 20081106;
 int verbosity = 2;
 
 #define ATSC_VSB	0x01
@@ -2579,7 +2579,7 @@
 {
 	char frontend_devname [80];
 	int adapter = 999, frontend = 0, demux = 0;
-	int opt, i;
+	int opt, i, j;
 	int frontend_fd;
 	int fe_open_mode;
 	int frontend_type = FE_OFDM;
@@ -2715,19 +2715,19 @@
 	if ( adapter == 999 ) {
 		info("Info: using DVB adapter auto detection.\n");
 		fe_open_mode = O_RDWR | O_NONBLOCK;
-		for (i=0; i < 4; i++) {
-		  snprintf (frontend_devname, sizeof(frontend_devname),  		"/dev/dvb/adapter%i/frontend0", i);
-		  if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
-		  	info("Info: unable to open frontend %s'\n", frontend_devname);
+		for (i=0; i < 8; i++) {
+		  for (j=0; j < 4; j++) {
+		    snprintf (frontend_devname, sizeof(frontend_devname), "/dev/dvb/adapter%i/frontend%i", i, j);
+		    if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
 			continue;
 			}
-		/* determine FE type and caps */
-		if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
+		    /* determine FE type and caps */
+		    if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
 			info("   ERROR: unable to determine frontend type\n");
 			close (frontend_fd);
 			continue;
-			}		  
-		if (fe_info.type==frontend_type) {
+			}
+		    if (fe_info.type == frontend_type) {
 			if (fe_info.type == FE_OFDM) 
 			  info("   Found DVB-T frontend. Using adapter %s\n",frontend_devname);
                         else if (fe_info.type == FE_ATSC)
@@ -2736,9 +2736,14 @@
 			  info("   Found DVB-C frontend. Using adapter %s\n",frontend_devname);                     
 			close (frontend_fd);
 			adapter=i;
+			frontend=j;
+			i=999;
 			break;
-			} 		
+			}
+                     else
+                        info("   Wrong type, ignoring frontend %s\n",frontend_devname);
 
+		  }
 		}
 	}
 	snprintf (frontend_devname, sizeof(frontend_devname),

[-- Attachment #3: Type: text/plain, Size: 150 bytes --]

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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[Hans Werner]

[-- Attachment #1: Type: text/plain, Size: 2122 bytes --]

> Hi,
> 
> Hans Werner wrote:
> > Currently wscan will not autodetect frontends which which have frontend
> != 0,
> > i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.
> >
> > Since multiple frontends per adapter are supported in 2.6.28, this means
> the correct
> > frontend may not be found. For example with the HVR4000, DVB-T is always
> at frontend1.
> >
> > The attached patch fixes this, searching for frontend 0-3 for each
> adapter 0-3.
> >
> > Signed-off-by: Hans Werner <hwerner4@gmx.de>
> Good idea. :)
> But while testing your patch it seems that it doesn't work as expected. 
> Here some example:
> 
> w_scan version 20081106
> Info: using DVB adapter auto detection.
>    Found DVB-C frontend. Using adapter /dev/dvb/adapter0/frontend0
>    Found DVB-C frontend. Using adapter /dev/dvb/adapter1/frontend0
>    Found DVB-C frontend. Using adapter /dev/dvb/adapter2/frontend0
> Info: unable to open frontend /dev/dvb/adapter3/frontend1'
> Info: unable to open frontend /dev/dvb/adapter3/frontend2'
> Info: unable to open frontend /dev/dvb/adapter3/frontend3'
> -_-_-_-_ Getting frontend capabilities-_-_-_-_
> 
> I'm using three dvb-c frontends.
> The detection doesnt stop anymore with your patch if a matching frontend 
> was found, because it doesnt leave the outer loop.
> Normally this search has to stop at /dev/dvb/adapter0/frontend0.

OK I see, you want to use the first usable card found, not the last as in my patch.

> That means we have to change your patch a little. I also increased the 
> number of adapters to 8, since i use more than 4.
> 
> Can you please test the attached patch and give some feedback? If it 
> works fine for you, i would apply to w_scan.
> 
> -Winfried
> 
> PS: What is actually the maximum number of adapters and frontends per 
> adapter? Can anybody give some hint?

Your patch works fine for me. I would add one thing though: close the frontend if it
is the wrong type. I have attached a new patch.

Thanks,
Hans
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[-- Attachment #2: patch_wscan_fixautodetection3.diff --]
[-- Type: text/x-patch, Size: 2167 bytes --]

diff -Nur w_scan-20080815/scan.c w_scan-20080815_patch3/scan.c
--- w_scan-20080815/scan.c	2008-08-16 09:02:01.000000000 +0100
+++ w_scan-20080815_patch3/scan.c	2008-11-06 17:31:23.000000000 +0000
@@ -77,7 +77,7 @@
 	.type = -1
 };
 
-uint version = 20080815;
+uint version = 20081106;
 int verbosity = 2;
 
 #define ATSC_VSB	0x01
@@ -2579,7 +2579,7 @@
 {
 	char frontend_devname [80];
 	int adapter = 999, frontend = 0, demux = 0;
-	int opt, i;
+	int opt, i, j;
 	int frontend_fd;
 	int fe_open_mode;
 	int frontend_type = FE_OFDM;
@@ -2715,19 +2715,20 @@
 	if ( adapter == 999 ) {
 		info("Info: using DVB adapter auto detection.\n");
 		fe_open_mode = O_RDWR | O_NONBLOCK;
-		for (i=0; i < 4; i++) {
-		  snprintf (frontend_devname, sizeof(frontend_devname),  		"/dev/dvb/adapter%i/frontend0", i);
-		  if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
-		  	info("Info: unable to open frontend %s'\n", frontend_devname);
+
+		for (i=0; i < 8; i++) {
+		  for (j=0; j < 4; j++) {
+		    snprintf (frontend_devname, sizeof(frontend_devname), "/dev/dvb/adapter%i/frontend%i", i, j);
+		    if ((frontend_fd = open (frontend_devname, fe_open_mode)) < 0) {
 			continue;
 			}
-		/* determine FE type and caps */
-		if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
+		    /* determine FE type and caps */
+		    if (ioctl(frontend_fd, FE_GET_INFO, &fe_info) == -1) {
 			info("   ERROR: unable to determine frontend type\n");
 			close (frontend_fd);
 			continue;
-			}		  
-		if (fe_info.type==frontend_type) {
+			}
+		    if (fe_info.type == frontend_type) {
 			if (fe_info.type == FE_OFDM) 
 			  info("   Found DVB-T frontend. Using adapter %s\n",frontend_devname);
                         else if (fe_info.type == FE_ATSC)
@@ -2736,9 +2737,16 @@
 			  info("   Found DVB-C frontend. Using adapter %s\n",frontend_devname);                     
 			close (frontend_fd);
 			adapter=i;
+			frontend=j;
+			i=999;
 			break;
-			} 		
+			}
+                     else {
+ 			info("   Wrong type, ignoring frontend %s\n",frontend_devname);
+			close (frontend_fd);
+			}
 
+		  }
 		}
 	}
 	snprintf (frontend_devname, sizeof(frontend_devname),

[-- Attachment #3: Type: text/plain, Size: 150 bytes --]

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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[Darron Broad]

In message <49131C19.1080404@gmx.de>, wk wrote:
>
>Hi,

LO

>Hans Werner wrote:
>> Currently wscan will not autodetect frontends which which have frontend != 0,
>> i.e. it only detects /dev/dvb/adapterN/frontend0 where N=0-3.
>>
>> Since multiple frontends per adapter are supported in 2.6.28, this means the correct
>> frontend may not be found. For example with the HVR4000, DVB-T is always at frontend1.
>>
>> The attached patch fixes this, searching for frontend 0-3 for each adapter 0-3.
>>
>> Signed-off-by: Hans Werner <hwerner4@gmx.de>
>Good idea. :)
>But while testing your patch it seems that it doesn't work as expected. 
>Here some example:
>
>w_scan version 20081106
>Info: using DVB adapter auto detection.
>   Found DVB-C frontend. Using adapter /dev/dvb/adapter0/frontend0
>   Found DVB-C frontend. Using adapter /dev/dvb/adapter1/frontend0
>   Found DVB-C frontend. Using adapter /dev/dvb/adapter2/frontend0
>Info: unable to open frontend /dev/dvb/adapter3/frontend1'
>Info: unable to open frontend /dev/dvb/adapter3/frontend2'
>Info: unable to open frontend /dev/dvb/adapter3/frontend3'
>-_-_-_-_ Getting frontend capabilities-_-_-_-_
>
>I'm using three dvb-c frontends.
>The detection doesnt stop anymore with your patch if a matching frontend 
>was found, because it doesnt leave the outer loop.
>Normally this search has to stop at /dev/dvb/adapter0/frontend0.
>That means we have to change your patch a little. I also increased the 
>number of adapters to 8, since i use more than 4.
>
>Can you please test the attached patch and give some feedback? If it 
>works fine for you, i would apply to w_scan.
>
>-Winfried
>
>PS: What is actually the maximum number of adapters and frontends per 
>adapter? Can anybody give some hint?

In relation to what Hans is addressing (Mutually exclusive frontends
on a single adapter AKA multi-frontend AKA MFE) then in theory the
core code is is not limited yet in practice there is a fixed provision
for two as that's the most that has been seen as yet.

Cya!

--

 // /
{:)==={ Darron Broad <darron@kewl.org>
 \\ \ 


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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[wk]

Hans Werner schrieb:
> Of course it's called w_scan, not wscan, sorry.
>
> Suggestion: how about setting -t 3 (long tuning timeout) and -O 1 (search other services)
> as the *default* options to give the program the best chance of finding all channels without
> having to play with the options? They do make a difference.
>
>   
Long timeout prolonges scan time without guarantee for any improvement - 
i don't like that idea.
This option is more or less only useful for frontends with really bad 
reception or problematic drivers.

Other services should effect output after scan only, but not scan 
itself. Otherwise a lot of useless services will put into channels.conf.




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Re: [linux-dvb] [PATCH] wscan: improved frontend autodetection

[wk]

> Your patch works fine for me. I would add one thing though: close the frontend if it
> is the wrong type. I have attached a new patch.
>
> Thanks,
> Hans
>   
Yes, i forgot close.
ok, i will apply that patch.

Winfried

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Re: [linux-dvb] [PATCH] stb0899: Set min symbol rate to 1000000

[Goga777]

Приветствую, Manu
> On Sat, Nov 8, 2008 at 1:30 PM, Igor M. Liplianin <liplianin@tut.by> wrote:
> > I can receive 3 mSym/s streams. So why do you limit frontend
> > capabilities to 5?
> 
> Lower than 5MSPS goes below the Half Power bandwidth characteristics.
> Usually we have limits defined within the characteristic region,
> rather than absolute limits at which tuning fails


that is strange limitation , there's a lot of dvb channels with streams less than 3 mSym/s
for example on cx24116 & HellasSat 39E we have follow results with xmlscan from Darron 
http://hg.kewl.org/xmldvb/

1=ARM 1;FT GLOBECAST:11109:VC23M2O35S0:0:3418:1235:1335:1
10170=AL-IRAQIA ATYAF;IMN BAGHDAD:11642:VC34M2O35S0:0:2175:33:36:10170
10180=ALFORqan;IMN BAGHDAD:11645:VC34M2O35S0:0:2180:308:256:10180
10180=AL-IRAQIA SPORT;IMN BAGHDAD:11652:VC34M2O35S0:0:2535:2007:36:10180
1=LIDER TV AZERBAIJAN;TANDBERG:12520:HC12M2O35S0:0:4340:513:256:1
66=EMOTION ART;EMOTION ART:12543:VC23M2O35S0:0:3333:48:49:66
1=Medi1SAT;TandbergTV:12545:HC56M2O35S0:0:2734:308:256:1
1709=EURONEWS-FRANCE;GLOBECAST:12558:VC23M2O35S0:0:8138:920:930:1709
4201=EURONEWS-AFRICA;SESAT:12558:VC23M2O35S0:0:8138:4221:4231:4201
1=Tandberg Service;TandbergTV:12591:VC34M2O35S0:0:2170:308:256:1
1=VIDEOLINA SAT;Tadiran Scopus:12596:VC23M2O35S0:0:2500:4194:4195:1
1=JSC Contribution;Service Provider:12610:VC34M2O35S0:0:2894:200:201:1
1=Al Jazeera;Arqiva:12614:VC34M2O35S0:0:2894:311:256:1
2=ZAGROS;Unnamed:12625:VC34M2O35S0:0:2668:33:36:2

will be nice if stb0899 cards also can LOCK low symbol rate channels

Goga

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Re: [linux-dvb] [PATCH] stb0899: Set min symbol rate to 1000000

[Morgan Tørvolt]

>> Lower than 5MSPS goes below the Half Power bandwidth characteristics.
>> Usually we have limits defined within the characteristic region,
>> rather than absolute limits at which tuning fails
>
>
> that is strange limitation , there's a lot of dvb channels with streams less than 3 mSym/s

Second that. There are lots and lots of muxes with low bandwidth, and
the satellite feeds used by many providers are usually 6111 MS or
something similar. Some people enjoy watching those, as they sometimes
contain football feeds or other such stuff.
C band usually use small bandwidth "muxes" with only one channel in
them also. Why put a limit on it? If it works, it works. I can
understand a limit on frequency, but not on symbolrate.

-Morgan-

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Re: [linux-dvb] [PATCH] stb0899: Set min symbol rate to 1000000

[Manu Abraham]

Goga777 wrote:
> Приветствую, Manu
>> On Sat, Nov 8, 2008 at 1:30 PM, Igor M. Liplianin <liplianin@tut.by> wrote:
>>> I can receive 3 mSym/s streams. So why do you limit frontend
>>> capabilities to 5?
>> Lower than 5MSPS goes below the Half Power bandwidth characteristics.
>> Usually we have limits defined within the characteristic region,
>> rather than absolute limits at which tuning fails
> 
> 
> that is strange limitation , there's a lot of dvb channels with streams less than 3 mSym/s
> for example on cx24116 & HellasSat 39E we have follow results with xmlscan from Darron 
> http://hg.kewl.org/xmldvb/
> 
> 1=ARM 1;FT GLOBECAST:11109:VC23M2O35S0:0:3418:1235:1335:1
> 10170=AL-IRAQIA ATYAF;IMN BAGHDAD:11642:VC34M2O35S0:0:2175:33:36:10170
> 10180=ALFORqan;IMN BAGHDAD:11645:VC34M2O35S0:0:2180:308:256:10180
> 10180=AL-IRAQIA SPORT;IMN BAGHDAD:11652:VC34M2O35S0:0:2535:2007:36:10180
> 1=LIDER TV AZERBAIJAN;TANDBERG:12520:HC12M2O35S0:0:4340:513:256:1
> 66=EMOTION ART;EMOTION ART:12543:VC23M2O35S0:0:3333:48:49:66
> 1=Medi1SAT;TandbergTV:12545:HC56M2O35S0:0:2734:308:256:1
> 1709=EURONEWS-FRANCE;GLOBECAST:12558:VC23M2O35S0:0:8138:920:930:1709
> 4201=EURONEWS-AFRICA;SESAT:12558:VC23M2O35S0:0:8138:4221:4231:4201
> 1=Tandberg Service;TandbergTV:12591:VC34M2O35S0:0:2170:308:256:1
> 1=VIDEOLINA SAT;Tadiran Scopus:12596:VC23M2O35S0:0:2500:4194:4195:1
> 1=JSC Contribution;Service Provider:12610:VC34M2O35S0:0:2894:200:201:1
> 1=Al Jazeera;Arqiva:12614:VC34M2O35S0:0:2894:311:256:1
> 2=ZAGROS;Unnamed:12625:VC34M2O35S0:0:2668:33:36:2
> 
> will be nice if stb0899 cards also can LOCK low symbol rate channels

The STB0899 and family do use the tuning algorithm completely in
software, rather than a hardware implementation. The algorithm is based
on many parameters based within the driver parameters.

Currently the STB0899 driver doesn't use a tuning algorithm which does
work at low symbol rates. There is an algorithm specified by STM for the
demodulator to go down as far as 2MSPS at Half power, but this needs
some more changes in the tuning algorithm. There wasn't any significant
interest on this by any of the users and this low bitrate algorithm was
never deployed. If there is significant interest, the low bitrate
algorithm can be deployed.


Regards,
Manu

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