redbutton-devel

[Redbutton-devel] Problem after retuning with Freesat

[John W. <jo...@po...>]

Hello,

I'm trying to get the redbutton program to work with a DVB-S card and
the BBC "Freesat" service. Actually, I'm trying to convert the code
into a plugin for the VDR program.

If I tune into BBC1 and run "rb-browser" then all goes well until I
select an option from the menu that causes it to re-tune. For example,
today there's an option that causes it to re-tune to "BBC Stream 35"
which is showing a programme about folk music. This service is on a
different transponder (12441MHz instead of 10773MHz). The re-tuning
works OK and I see the new programme, but rb-browser then tries to
re-initialize and looks for ~//a or ~//startup. Neither of these exist
in the new service, so after a few seconds it gives up and exits.

There are certainly some carousel files being downloaded from the
"Stream 35" service, so I suppose rb-browser is looking for the wrong
thing, but I can't puzzle out what.

I've got a spec (mheg_profile_106.pdf), which says the initial file
object can be sent in the ServiceContextList, but the debug output
shows this is empty. There is a file "/app/a", so I tried hardcoding
this as the initial file instead of "/a"; it read the file and then
tried to find "/boot", and neither /boot nor /app/boot exist, so that
didn't work.

Any suggestions on how to debug this would be welcome, as I'm stuck.

Regards,
John Williams

Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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sounds a bit odd, could you run rb-browser with the -v option and send
the log and/or tar up the services and carousels directory that
rb-download creates for both the initial and the re-tuned service?

On 15/02/11 22:46, John Williams wrote:
> Hello,
> 
> I'm trying to get the redbutton program to work with a DVB-S card and
> the BBC "Freesat" service. Actually, I'm trying to convert the code
> into a plugin for the VDR program.
> 
> If I tune into BBC1 and run "rb-browser" then all goes well until I
> select an option from the menu that causes it to re-tune. For example,
> today there's an option that causes it to re-tune to "BBC Stream 35"
> which is showing a programme about folk music. This service is on a
> different transponder (12441MHz instead of 10773MHz). The re-tuning
> works OK and I see the new programme, but rb-browser then tries to
> re-initialize and looks for ~//a or ~//startup. Neither of these exist
> in the new service, so after a few seconds it gives up and exits.
> 
> There are certainly some carousel files being downloaded from the
> "Stream 35" service, so I suppose rb-browser is looking for the wrong
> thing, but I can't puzzle out what.
> 
> I've got a spec (mheg_profile_106.pdf), which says the initial file
> object can be sent in the ServiceContextList, but the debug output
> shows this is empty. There is a file "/app/a", so I tried hardcoding
> this as the initial file instead of "/a"; it read the file and then
> tried to find "/boot", and neither /boot nor /app/boot exist, so that
> didn't work.
> 
> Any suggestions on how to debug this would be welcome, as I'm stuck.
> 
> Regards,
> John Williams
> 
> 
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
> _______________________________________________
> Redbutton-devel mailing list
> Red...@li...
> https://lists.sourceforge.net/lists/listinfo/redbutton-devel
> 
> 

- -- 
Simon Kilvington


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Re: [Redbutton-devel] Problem after retuning with Freesat

[John W. <jo...@po...>]

On Wed, 16 Feb 2011 09:36:25 +0000
Simon Kilvington <s.k...@er...> wrote:

> sounds a bit odd, could you run rb-browser with the -v option and send
> the log and/or tar up the services and carousels directory that
> rb-download creates for both the initial and the re-tuned service?

Wow, thanks for the quick reply.

I've put a couple of files on a web server: 

http://john-williams.org/rb-browser.out.gz (the browser log)

http://john-williams.org/mheg.tar.gz (services and carousels)

I tuned to BBC1 (sid 6351) and pressed the menu entry to watch some
sports. This retuned to sid 6886 which is on a different transponder.

Wireshark shows rb-browser continuously trying to download the ~//a and
~//startup files. After a few seconds it gives up and bombs out.

The log will also show that "avstream" is not working. That's OK,
because the VDR program is holding the /dev/dvb/adapter0/dvr0 file
open. I think I can fix that.

Thanks,
John Williams

Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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think I can see what the problem is - looking into this missing Resident
Program a bit more...

TODO: program TII SI_TuneIndexInfo

it looks like this should tell the browser to continue running the
current MHEG app when it retunes the video - that would explain why
there is no ~//a or ~//startup etc in the new channel - it's supposed to
keep running the current app

I've got some ideas for a patch, but it may take a while as I'm pretty
snowed under at work at the moment...

On 16/02/11 20:52, John Williams wrote:
> On Wed, 16 Feb 2011 09:36:25 +0000
> Simon Kilvington <s.k...@er...> wrote:
> 
>> sounds a bit odd, could you run rb-browser with the -v option and send
>> the log and/or tar up the services and carousels directory that
>> rb-download creates for both the initial and the re-tuned service?
> 
> Wow, thanks for the quick reply.
> 
> I've put a couple of files on a web server: 
> 
> http://john-williams.org/rb-browser.out.gz (the browser log)
> 
> http://john-williams.org/mheg.tar.gz (services and carousels)
> 
> I tuned to BBC1 (sid 6351) and pressed the menu entry to watch some
> sports. This retuned to sid 6886 which is on a different transponder.
> 
> Wireshark shows rb-browser continuously trying to download the ~//a and
> ~//startup files. After a few seconds it gives up and bombs out.
> 
> The log will also show that "avstream" is not working. That's OK,
> because the VDR program is holding the /dev/dvb/adapter0/dvr0 file
> open. I think I can fix that.
> 
> Thanks,
> John Williams
> 
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
> _______________________________________________
> Redbutton-devel mailing list
> Red...@li...
> https://lists.sourceforge.net/lists/listinfo/redbutton-devel
> 
> 
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Re: [Redbutton-devel] Problem after retuning with Freesat

[John W. <jo...@po...>]

On Fri, 18 Feb 2011 17:31:28 +0000
Simon Kilvington <s.k...@er...> wrote:

> think I can see what the problem is - looking into this missing
> Resident Program a bit more...
> 
> TODO: program TII SI_TuneIndexInfo
> 
> it looks like this should tell the browser to continue running the
> current MHEG app when it retunes the video - that would explain why
> there is no ~//a or ~//startup etc in the new channel - it's supposed
> to keep running the current app

I found some new documentation:
http://www.etsi.org/deliver/etsi_es/202100_202199/202184/02.01.01_60/es_202184v020101p.pdf

which explains what SI_TuneIndexInfo should do.

If I can produce a patch myself, I'll send it to you. Although I don't
have much time for it either.

Thanks,
John

Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <si...@un...>]

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On 18/02/11 22:54, John Williams wrote:
> On Fri, 18 Feb 2011 17:31:28 +0000
> Simon Kilvington <s.k...@er...> wrote:
> 
>> think I can see what the problem is - looking into this missing
>> Resident Program a bit more...
>>
>> TODO: program TII SI_TuneIndexInfo
>>
>> it looks like this should tell the browser to continue running the
>> current MHEG app when it retunes the video - that would explain why
>> there is no ~//a or ~//startup etc in the new channel - it's supposed
>> to keep running the current app
> 
> I found some new documentation:
> http://www.etsi.org/deliver/etsi_es/202100_202199/202184/02.01.01_60/es_202184v020101p.pdf
> 
> which explains what SI_TuneIndexInfo should do.
> 
> If I can produce a patch myself, I'll send it to you. Although I don't
> have much time for it either.
> 
> Thanks,
> John
> 

the attached patch will print out what value the app is trying to pass
to the SI_TuneIndexInfo function - can you give it a try so we can see
what the app is trying to do?
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Re: [Redbutton-devel] Problem after retuning with Freesat

[John W. <jo...@po...>]

On Sat, 19 Feb 2011 10:45:28 +0000
Simon Kay <si...@un...> wrote:

> the attached patch will print out what value the app is trying to pass
> to the SI_TuneIndexInfo function - can you give it a try so we can see
> what the app is trying to do?

Thanks for this: it was just the clue I needed to get it working.
The parameter to SI_TuneIndexInfo is 11 (0x0b); so we should keep
running after the tune.

I've attached a patch which makes it work.

This needs more work on it: my patch just keeps running the original
carousel, and we should instead switch to using a carousel from the new
service. But it has got me past the point where it was going wrong.
When I've got time I'll try to produce a complete fix.

Thanks,
John

Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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On 19/02/11 18:51, John Williams wrote:
> 
> I've attached a patch which makes it work.
> 
> This needs more work on it: my patch just keeps running the original
> carousel, and we should instead switch to using a carousel from the new
> service. But it has got me past the point where it was going wrong.
> When I've got time I'll try to produce a complete fix.
> 
> Thanks,
> John
> 

cool! I'll integrate what you've done - I think the carousel switching
will need a bit of thinking about...
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Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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On 21/02/11 17:41, Simon Kilvington wrote:
> On 19/02/11 18:51, John Williams wrote:
> 
>> I've attached a patch which makes it work.
> 
>> This needs more work on it: my patch just keeps running the original
>> carousel, and we should instead switch to using a carousel from the new
>> service. But it has got me past the point where it was going wrong.
>> When I've got time I'll try to produce a complete fix.
> 
>> Thanks,
>> John
> 
> 
> cool! I'll integrate what you've done - I think the carousel switching
> will need a bit of thinking about...

just got a quick question - I don't have access to FreeSat, so I can't
test this, but what happens to the video stream when the channel changes
with your patch? Does the video carry on playing?

If it works as it is (ie the new channel video appears) then it is
probably just lucky. I think we are going to have to reset the
MHEGStreamPlayer object after the tune - actually, the PID filter to the
dvr device will need updating, but it is done through the stream player
object.

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Re: [Redbutton-devel] Problem after retuning with Freesat

[John W. <jo...@po...>]

On Mon, 28 Feb 2011 12:44:45 +0000
Simon Kilvington <s.k...@er...> wrote:

> just got a quick question - I don't have access to FreeSat, so I can't
> test this, but what happens to the video stream when the channel
> changes with your patch? Does the video carry on playing?

No. In fact the new channel is on a completely different transponder
(12.441GHz instead of 10.773GHz), it has a different SID, different
VPID and APID etc etc. The video just freezes.

The spec says "any prepared MHEG-5 Stream objects shall be re-evaluated
according to the context of the new service as if a SetData action had
occurred". I would *guess* that this means that, if it was playing the
default video/audio for the service before the tune, it should start
playing the video/audio of the new service after the tune. This would
require some code to change the PES filters to the new VPID and APID,
which doesn't exist at the moment. Also, I think I've sometimes
seem a StreamClass SetData action, which isn't implemented: perhaps
this is setting some details of the new service?

If I navigate to the menu option that takes me back to the original
program on BBC1, then the video comes back to life again. So the PES
filters must still be working OK, they are just filtering the wrong PIDs
for the new service.

Actually, I've built the code of rb-download into a plugin for the
"vdr" program, so that rb-download uses vdr to do the tuning; this
means that the new channel appears on my TV after the tune. Now the
rb-browser program doesn't show any video at all, because vdr has got
control of the dvr0 device; but my plan is to make rb-browser into a
vdr plugin too, so that its text output will appear overlayed on top of
the video output from vdr.

Regards,
John

Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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On 28/02/11 20:16, John Williams wrote:
> On Mon, 28 Feb 2011 12:44:45 +0000
> Simon Kilvington <s.k...@er...> wrote:
> 
>> just got a quick question - I don't have access to FreeSat, so I can't
>> test this, but what happens to the video stream when the channel
>> changes with your patch? Does the video carry on playing?
> 
> No. In fact the new channel is on a completely different transponder
> (12.441GHz instead of 10.773GHz), it has a different SID, different
> VPID and APID etc etc. The video just freezes.
> 
> The spec says "any prepared MHEG-5 Stream objects shall be re-evaluated
> according to the context of the new service as if a SetData action had
> occurred". I would *guess* that this means that, if it was playing the
> default video/audio for the service before the tune, it should start
> playing the video/audio of the new service after the tune. This would
> require some code to change the PES filters to the new VPID and APID,
> which doesn't exist at the moment. Also, I think I've sometimes
> seem a StreamClass SetData action, which isn't implemented: perhaps
> this is setting some details of the new service?
> 
> If I navigate to the menu option that takes me back to the original
> program on BBC1, then the video comes back to life again. So the PES
> filters must still be working OK, they are just filtering the wrong PIDs
> for the new service.
> 

I've just committed a patch that should (hopefully) allow the video to
continue running when it changes channel - can you give it a try?

it only handles the case when SetData is called explicitly, so it should
work on this example, but I need to do an implicit SetData call when we
do a non-destructive retune - if this works, I'll add that in...

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