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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


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.


> (And yes, I know the real solution is to target a non-Tegra platform :-P )
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