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Re: [Linphone-developers] android video on NVIDIA tegra
From: |
Jehan Monnier |
Subject: |
Re: [Linphone-developers] android video on NVIDIA tegra |
Date: |
Wed, 6 Jul 2011 10:17:57 +0200 |
Hi,
Le 20 juin 2011 à 20:51, Jesse Pfeister a écrit :
> Greetings. I am working on getting linphone video working on the NVIDIA Tegra
> processor. Here is a summary of what I have found so far:
>
> 1. Tegra is armv7-a but does not support optional NEON SIMD instructions.
>
> 2. Linphone's code has lots of neon specific goodies written into it (which
> means compiling the current implementation of linphone for Tegra is
> impossible)
Not a lot actually, only in scaler.c and msresampler.c.
>
> 3. A guy used an old video codec (H263-1998) to get video working in the
> ddPhoneVideo/smsVideo apps
>
> Are there any resources regarding adding codecs to linphone? I've been
> browsing docs and mailing lists to no avail.
Have a look to videoenc.c.
>
> What I suspect after reading the code: NEON is in the anatomy of linphone's
> video system and cannot easily be replaced by a simple codec switch.
You are too pessimistic, have a look to msresampler.c, you can see that neon
code is deactivate at runtime. You just have to perform the same on scaler.c
>
> Thanks for any help you can provide.
Cheers
>
> (And yes, I know the real solution is to target a non-Tegra platform :-P )
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