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Eli Hughes | 1 Jul 2006 03:30
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User Pointer Streaming Question

Hello All:

I have a question about the v4l2 API.  I am using a BT878 based MiniPCI card.  I
have able to successfully acquire video frames by passing the proper structures
via ioctrl calls and reading the /dev/video0 device.

I need a method that is faster (I can only get about 10frames per second with
reads to /dev/video) so I wish to use the user pointer streaming method.

Here is my question:

After I request the user pointer buffer method, enqueue a 'user pointer' and
pass the IOSTREAMON command, how to how when the driver has filled my buffer?  

Right now the way I am testing everything is by reading in raw image data and
then creating a jpeg file with libjpeg.  I am always successfull with
/dev/video reads but get black images with user pointer streams.   What is the
proper procodure for enqueuing 1 user buffer, starting the stream and waiting
for the buffer to become filled?

Thanks,
Eli Hughes

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Julian Calaby | 1 Jul 2006 07:11
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Re: modprobe bttv options applied for the first chip only

On 7/1/06, Stefan de Konink <skinkie <at> xs4all.nl> wrote:
> I have a minor issue with the modprobe utily or bttv-module.
>
> When I do modprobe bttv pll=28 this only applies pll=28 for bttv0 but not
> for bttv1, bttv2, bttv3. What should be applied or configured to get the
> parameter to work for all hardware?

To specify options for multiple cards, you separate the option values
with commas.

E.g. "pll=28,28,28,28" (for 4 cards).

Thanks,

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Email: julian.calaby <at> gmail.com

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christophe delattre | 1 Jul 2006 09:56
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Re: Fw: HVR1300 Support?

Hermann,
I'm pretty sure that Steve did his best to make it work, and he did make a 
very good part of the way; nevertheless, I still have an expensive card I 
can't use (as some of us) ;-)
Maybe some help can do the difference ? I'm not a Linux driver developper, 
so I have to leave this to experienced people, but I may try and find some 
mising information: Do you know what information on the chips are needed 
exactly ?

Chris

----- Original Message ----- 
From: "hermann pitton" <hermann-pitton <at> arcor.de>
To: "Linux and Kernel Video" <video4linux-list <at> redhat.com>
Sent: Thursday, June 29, 2006 3:00 AM
Subject: Re: Fw: HVR1300 Support?

> Am Mittwoch, den 28.06.2006, 21:15 +0200 schrieb Christophe DELATTRE:
>> Same for me... The card has been bought when Steve released his alpha
>> drivers some weeks ago, I just tought it was a matter of weeks before a 
>> beta
>> or better release came out. But nothing appeared, and no clue coming out 
>> on
>> possible on-going work...
>> Steve, please, what is the status of this driver ?
>>
>> Chris
>>
>
> Hi,
(Continue reading)

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Brijesh | 1 Jul 2006 10:05

How to do streamoff and streamon

Hi all,

i want to restart the streaming. For that, i am first doing ioctl 
VIDIOC_STREAMOFF and then VIDIOC_STREAMON. i come to know from the 
internet that when we do stream off, it performs buffers reset.so i 
againg queued buffers and then performed STREAMON. now it is working but 
my problem is sometimes colors of the images are changed. blue color 
becomes green. does anyone know reason for this?

thanx in advance.

Brijesh

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hermann pitton | 1 Jul 2006 14:02
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Re: Fw: HVR1300 Support?

Am Samstag, den 01.07.2006, 09:56 +0200 schrieb christophe delattre:
> Hermann,
> I'm pretty sure that Steve did his best to make it work, and he did make a 
> very good part of the way; nevertheless, I still have an expensive card I 
> can't use (as some of us) ;-)
> Maybe some help can do the difference ? I'm not a Linux driver developper, 
> so I have to leave this to experienced people, but I may try and find some 
> mising information: Do you know what information on the chips are needed 
> exactly ?

Hi Chris,

as said, I can't tell.

According to Steve's comments to keep all involved devices in a sane
state during switching to the different functions of the card is the
difficult part on it.

http://linuxtv.org/hg/~stoth/v4l-dvb?cmd=changeset;node=a92d18cdf452;style=gitweb

http://marc.theaimsgroup.com/?l=linux-video&m=114183371013406&w=2

Testing the alpha driver might help to isolate unwanted behaviour.
Since a lot of tricky stuff is involved, even that seems not easy.

Steve was quite confident to come through with it previously, he probably also has the
docs, but what you read in datasheets and what the chips do sometimes differs ...

Cheers,
Hermann
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glumor | 1 Jul 2006 14:43
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glumor | 1 Jul 2006 16:06
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stephen | 1 Jul 2006 16:17
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about: frame buffer display

how should I do if I want to display the video I captureed on LCD using framebuffer..?
 		
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Ricardo Cerqueira | 2 Jul 2006 00:38

Re: modprobe bttv options applied for the first chip only

On Fri, 2006-06-30 at 21:49 +0200, Stefan de Konink wrote:
> I have a minor issue with the modprobe utily or bttv-module.
> 
> When I do modprobe bttv pll=28 this only applies pll=28 for bttv0 but not
> for bttv1, bttv2, bttv3. What should be applied or configured to get the
> parameter to work for all hardware?

Most manual parameters must be applied individually to each instance of
the hardware. In this case, for 4 cards, it's pll=28,28,28,28

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