H.264 format support?

H.264 format support?

[javier Martin]

Hi,
I have been reading formats supported in V4L2 api and I haven't found
H.264 in compressed formats.

Do you plan to add a define for this format? If not what would be the
problem with it?

Thank you.

-- 
Javier Martin
Vista Silicon S.L.
Universidad de Cantabria
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com

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Re: H.264 format support?

[Robert Schwebel]

On Thu, Aug 06, 2009 at 05:42:12PM +0200, javier Martin wrote:
> I have been reading formats supported in V4L2 api and I haven't found
> H.264 in compressed formats.
> 
> Do you plan to add a define for this format? If not what would be the
> problem with it?

If I remember correctly, Freescale has H.264 encoding in the same
package that also contains MPEG4 stuff, both as gstreamer plugins.

Check how it is integrated in OSELAS.Phytec-phyCORE-12-1:
http://www.pengutronix.de/oselas/bsp/phytec/download/phyCORE/OSELAS.BSP-Phytec-phyCORE-12-1.tar.gz

rsc
-- 
Pengutronix e.K.                           |                             |
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Re: H.264 format support?

[javier Martin]

2009/8/7 Robert Schwebel <r.schwebel@pengutronix.de>:
> On Thu, Aug 06, 2009 at 05:42:12PM +0200, javier Martin wrote:
>> I have been reading formats supported in V4L2 api and I haven't found
>> H.264 in compressed formats.
>>
>> Do you plan to add a define for this format? If not what would be the
>> problem with it?
>
> If I remember correctly, Freescale has H.264 encoding in the same
> package that also contains MPEG4 stuff, both as gstreamer plugins.
>

Yes, I know Freescale has it integrated in the same package, but the
truth is that in V4L2 there is no definition for H264 output format.
That makes a little difficult for a driver which outputs H.264 to
enter mainline kernel. That is why I am asking for an H.264 output
format definition..

See V4L2 API spec:
http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec-single/v4l2.html#AEN5634


> Check how it is integrated in OSELAS.Phytec-phyCORE-12-1:
> http://www.pengutronix.de/oselas/bsp/phytec/download/phyCORE/OSELAS.BSP-Phytec-phyCORE-12-1.tar.gz

Thank you for the link, I will take a look at it.

>
> rsc
> --
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
>



-- 
Javier Martin
Vista Silicon S.L.
Universidad de Cantabria
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com

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Re: H.264 format support?

[Robert Schwebel]

On Mon, Aug 10, 2009 at 08:51:49AM +0200, javier Martin wrote:
> > If I remember correctly, Freescale has H.264 encoding in the same
> > package that also contains MPEG4 stuff, both as gstreamer plugins.
>
> Yes, I know Freescale has it integrated in the same package, but the
> truth is that in V4L2 there is no definition for H264 output format.
> That makes a little difficult for a driver which outputs H.264 to
> enter mainline kernel. That is why I am asking for an H.264 output
> format definition..

Well, that's why using gstreamer for the encoding stage looks like a
good solution for me. If it needs something on the definition layer
(i.e. new color space 4cc definitions etc) it is usually solvable.

> See V4L2 API spec:
> http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec-single/v4l2.html#AEN5634
>
> > Check how it is integrated in OSELAS.Phytec-phyCORE-12-1:
> > http://www.pengutronix.de/oselas/bsp/phytec/download/phyCORE/OSELAS.BSP-Phytec-phyCORE-12-1.tar.gz
>
> Thank you for the link, I will take a look at it.

Yup. If you are missing something, please ask back again.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: H.264 format support?

[Daniel Glöckner]

On Mon, Aug 10, 2009 at 08:51:49AM +0200, javier Martin wrote:
> Yes, I know Freescale has it integrated in the same package, but the
> truth is that in V4L2 there is no definition for H264 output format.
> That makes a little difficult for a driver which outputs H.264 to
> enter mainline kernel. That is why I am asking for an H.264 output
> format definition..

Pixel formats are added as needed. So you can create this format
yourself and later post it (including a small patch for the V4L2 API
spec) as part of the patch set for the driver.

  Daniel

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