Hi
(repeating my preamble from a previous post)
This is a general comment to the whole media controller work: having
given a talk at the ELC-E in Grenoble on soc-camera, I mentioned briefly a
few related RFCs, including this one. I've got a couple of comments back,
including the following
On Tue, Oct 27, 2009 at 4:04 AM, Guennadi Liakhovetski
g.liakhovet...@gmx.de wrote:
Hi
(repeating my preamble from a previous post)
This is a general comment to the whole media controller work: having
given a talk at the ELC-E in Grenoble on soc-camera, I mentioned briefly a
few related
Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 22:15:15 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 21:59:37 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:23:44 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
The second problem is that this will
On Thursday 17 September 2009 00:28:38 Karicheri, Muralidharan wrote:
And as I explained above, a v4l2_subdev just implements an interface. It
has
no relation to devices. And yes, I'm beginning to agree with you that
subdevice
was a bad name because it suggested something that it simply
On Thursday 17 September 2009 00:15:23 Andy Walls wrote:
On Wed, 2009-09-16 at 23:34 +0200, Hans Verkuil wrote:
On Wednesday 16 September 2009 22:50:43 Mauro Carvalho Chehab wrote:
Em Wed, 16 Sep 2009 21:21:16 +0200
C) in all other cases you only get it if a kernel config option is on.
Em Thu, 17 Sep 2009 08:35:57 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Thursday 17 September 2009 00:15:23 Andy Walls wrote:
On Wed, 2009-09-16 at 23:34 +0200, Hans Verkuil wrote:
On Wednesday 16 September 2009 22:50:43 Mauro Carvalho Chehab wrote:
Em Wed, 16 Sep 2009 21:21:16
Em Thu, 17 Sep 2009 08:34:23 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Thursday 17 September 2009 00:28:38 Karicheri, Muralidharan wrote:
And as I explained above, a v4l2_subdev just implements an interface. It
has
no relation to devices. And yes, I'm beginning to agree with
Em Wed, 16 Sep 2009 23:34:08 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
I'm just guessing, but If the two usecases are so different, maybe we
shouldn't
try to find a common solution for the two problems, or maybe we should use
an
approach similar to debufs, where you enable/mount
Em Sat, 12 Sep 2009 00:39:50 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
From my previous understanding, those are the needs:
1) V4L2 API will keep being used to control the devices and to do streaming,
working under the already well defined devices;
Yes.
2) One Kernel object
On Wednesday 16 September 2009 20:15:20 Mauro Carvalho Chehab wrote:
Em Sat, 12 Sep 2009 00:39:50 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
From my previous understanding, those are the needs:
1) V4L2 API will keep being used to control the devices and to do
streaming,
On Wed, 16 Sep 2009, Hans Verkuil wrote:
On Wednesday 16 September 2009 20:15:20 Mauro Carvalho Chehab wrote:
What's a sub-device?
Well, if we strip v4l2-framework.txt and driver/media from git grep, we
have:
For subdevice, there are several occurences.
Em Wed, 16 Sep 2009 21:21:16 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Wednesday 16 September 2009 20:15:20 Mauro Carvalho Chehab wrote:
Em Sat, 12 Sep 2009 00:39:50 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
From my previous understanding, those are the needs:
1)
On Wednesday 16 September 2009 22:50:43 Mauro Carvalho Chehab wrote:
Em Wed, 16 Sep 2009 21:21:16 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Wednesday 16 September 2009 20:15:20 Mauro Carvalho Chehab wrote:
Em Sat, 12 Sep 2009 00:39:50 +0200
Hans Verkuil hverk...@xs4all.nl
And as I explained above, a v4l2_subdev just implements an interface. It
has
no relation to devices. And yes, I'm beginning to agree with you that
subdevice
was a bad name because it suggested something that it simply isn't.
That said, I also see some advantages in doing this. For statistics
Hi Hans,
On Thursday 10 September 2009 17:00:40 Hans Verkuil wrote:
On Thu, 10 Sep 2009, Hans Verkuil wrote:
Could entities not be completely addressed (configuration ioctls)
through the mc-node?
Not sure what you mean.
Instead of having a device node for each entity, the
On Thursday 10 September 2009 23:59:20 Hans Verkuil wrote:
On Thursday 10 September 2009 23:28:40 Guennadi Liakhovetski wrote:
Hi Hans
a couple of comments / questions from the first glance
On Thu, 10 Sep 2009, Hans Verkuil wrote:
[snip]
This requires no API changes and is very
-Original Message-
From: linux-media-ow...@vger.kernel.org [mailto:linux-media-
ow...@vger.kernel.org] On Behalf Of Hans Verkuil
Sent: Thursday, September 10, 2009 12:43 PM
To: linux-media@vger.kernel.org
Subject: RFCv2: Media controller proposal
Hi all,
Here is the new Media
On Friday 11 September 2009 01:08:30 Karicheri, Muralidharan wrote:
Hans,
Thanks for your reply..
What you mean by controlling the board?
In general: the media controller can do anything except streaming. However,
that is an extreme position and in practice all the usual ioctls
-Original Message-
From: linux-media-ow...@vger.kernel.org [mailto:linux-media-
ow...@vger.kernel.org] On Behalf Of Hans Verkuil
Sent: Friday, September 11, 2009 1:57 AM
To: Karicheri, Muralidharan
Cc: Patrick Boettcher; Linux Media Mailing List
Subject: Re: RFCv2: Media controller
-Original Message-
From: linux-media-ow...@vger.kernel.org [mailto:linux-media-
ow...@vger.kernel.org] On Behalf Of Hans Verkuil
Sent: Friday, September 11, 2009 11:51 AM
To: Karicheri, Muralidharan
Cc: Patrick Boettcher; Linux Media Mailing List
Subject: Re: RFCv2: Media
: RFCv2: Media controller proposal
Hi all,
Here is the new Media Controller RFC. It is completely rewritten
from the
original RFC. This original RFC can be found here:
http://www.archivum.info/video4linux-list%40redhat.com/2008-
07/00371/RFC
Em Thu, 10 Sep 2009 16:27:20 -0400
Devin Heitmueller dheitmuel...@kernellabs.com escreveu:
On Thu, Sep 10, 2009 at 4:20 PM, Mauro Carvalho
Chehabmche...@infradead.org wrote:
In fact, this can already be done by using the sysfs interface. the current
version of v4l2-sysfs-path.c already
Em Thu, 10 Sep 2009 23:35:52 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
First of all, a generic comment: you enumerated on your RFC several needs
that
you expect to be solved with a media controller, but you didn't mention what
userspace API will be used to solve it (e. g. what
On Fri, Sep 11, 2009 at 11:13 AM, Mauro Carvalho Chehab
mche...@infradead.org wrote:
Em Thu, 10 Sep 2009 23:35:52 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
First of all, a generic comment: you enumerated on your RFC several needs
that
you expect to be solved with a media
-Original Message-
From: linux-media-ow...@vger.kernel.org [mailto:linux-media-
ow...@vger.kernel.org] On Behalf Of Devin Heitmueller
Sent: Friday, September 11, 2009 9:16 PM
To: Mauro Carvalho Chehab
Cc: Hans Verkuil; linux-media@vger.kernel.org
Subject: Re: RFCv2: Media controller
Cc: Hans Verkuil; linux-media@vger.kernel.org
Subject: Re: RFCv2: Media controller proposal
On Fri, Sep 11, 2009 at 11:13 AM, Mauro Carvalho Chehab
mche...@infradead.org wrote:
Em Thu, 10 Sep 2009 23:35:52 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
snip
I was talking
-Original Message-
From: Mauro Carvalho Chehab [mailto:mche...@infradead.org]
Sent: Friday, September 11, 2009 10:34 PM
To: Hiremath, Vaibhav
Cc: Devin Heitmueller; Hans Verkuil; linux-media@vger.kernel.org
Subject: Re: RFCv2: Media controller proposal
Em Fri, 11 Sep 2009 21:23
Em Fri, 11 Sep 2009 23:04:13 +0530
Hiremath, Vaibhav hvaib...@ti.com escreveu:
[Hiremath, Vaibhav] I was referring to standard V4L2 interface; I was
referring to backward compatibility between Media controller devices itself.
Huh? There's no media controller concept implemented yet. Hans
Mauro,
I am going to move the ioctl vs sysfs discussion to a separate thread. I'll
post an analysis of that later today or tomorrow.
See below for my comments on some misunderstandings for non-sysfs issues.
On Friday 11 September 2009 17:13:42 Mauro Carvalho Chehab wrote:
snip
All this
On Friday 11 September 2009 20:52:17 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 23:04:13 +0530
Hiremath, Vaibhav hvaib...@ti.com escreveu:
[Hiremath, Vaibhav] I was referring to standard V4L2 interface; I was
referring to backward compatibility between Media controller devices
Em Fri, 11 Sep 2009 21:08:13 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
No, devices aren't created or deleted. Only links between devices.
I think that there are some cases where devices are created/deleted. For
example, on some hardware, you have some blocks that allow you to have
On Friday 11 September 2009 21:54:03 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:08:13 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
snip
OK, so instead we require an application to construct a file containing a
new
topology, write something to a sysfs file, require code in
Em Fri, 11 Sep 2009 22:29:41 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 21:54:03 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:08:13 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
snip
OK, so instead we require an application to construct a
Em Fri, 11 Sep 2009 22:15:15 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 21:59:37 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:23:44 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
In the case of resizer, I don't see why this can't be implemented
On Friday 11 September 2009 23:37:58 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 22:15:15 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 21:59:37 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:23:44 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 23:28:47 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 22:29:41 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
On Friday 11 September 2009 21:54:03 Mauro Carvalho Chehab wrote:
Em Fri, 11 Sep 2009 21:08:13 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
Hi all,
Here is the new Media Controller RFC. It is completely rewritten from the
original RFC. This original RFC can be found here:
http://www.archivum.info/video4linux-list%40redhat.com/2008-07/00371/RFC:_Add_support_to_query_and_change_connections_inside_a_media_device
This document will be
Hello Hans,
On Thu, 10 Sep 2009, Hans Verkuil wrote:
Here is the new Media Controller RFC. It is completely rewritten from the
original RFC. This original RFC can be found here:
On Thu, 10 Sep 2009, Hans Verkuil wrote:
Now that this is in we can continue with the next phase and actually think
on how it should be implemented.
Sounds logic.
Hmm... I'm seeing this idea covering other stream-oriented devices. Like
sound-cards (*ouch*).
I may be mistaken, but I don't
On Thu, 10 Sep 2009, Hans Verkuil wrote:
Now that this is in we can continue with the next phase and actually
think
on how it should be implemented.
Sounds logic.
Hmm... I'm seeing this idea covering other stream-oriented devices.
Like
sound-cards (*ouch*).
I may be mistaken, but I
Hans,
I haven't gone through the RFC, but thought will respond to the below comment.
Murali Karicheri
Software Design Engineer
Texas Instruments Inc.
Germantown, MD 20874
new phone: 301-407-9583
Old Phone : 301-515-3736 (will be deprecated)
email: m-kariche...@ti.com
I may be mistaken, but I
Hi Hans,
Hi Hans,
Em Thu, 10 Sep 2009 09:13:09 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
First of all, a generic comment: you enumerated on your RFC several needs that
you expect to be solved with a media controller, but you didn't mention what
userspace API will be used to solve it (e.
On Thursday 10 September 2009 21:19:25 Karicheri, Muralidharan wrote:
Hans,
I haven't gone through the RFC, but thought will respond to the below comment.
Murali Karicheri
Software Design Engineer
Texas Instruments Inc.
Germantown, MD 20874
new phone: 301-407-9583
Old Phone :
Hi Hans
a couple of comments / questions from the first glance
On Thu, 10 Sep 2009, Hans Verkuil wrote:
[snip]
Topology
The topology is represented by entities. Each entity has 0 or more inputs and
0 or more outputs. Each input or output can be linked to 0 or more possible
On Thursday 10 September 2009 22:20:13 Mauro Carvalho Chehab wrote:
Hi Hans,
Hi Hans,
Em Thu, 10 Sep 2009 09:13:09 +0200
Hans Verkuil hverk...@xs4all.nl escreveu:
First of all, a generic comment: you enumerated on your RFC several needs that
you expect to be solved with a media
Hans,
Thanks for your reply..
What you mean by controlling the board?
In general: the media controller can do anything except streaming. However,
that is an extreme position and in practice all the usual ioctls should
remain supported by the video device nodes.
We have currently ported
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