[Android] Unaligned memory access on HTC OneX

[Rafaël Carré]

Hello,

Please send it on vlc-devel@

Le 05/10/2012 10:02, XilasZ a écrit :
> As some of you may know, Tegra3 on the HTC OneX is a quad core, but there
> is a big issue (at least on my device) :
> 
> Core0 can do unaligned memory access, but the others can't, unaligned
> access on core1/core2/core3 will trigger a SIGBUS signal which will crash
> the app.
> libav use unaligned memory access when decoding on arm, i got random SIGBUS
> crashes when playing h264 videos.
> We checked this with mru, it's not a bug in libav or vlc, so it's either
> the cpu itself or the kernel (version 2.6.39.4 on my device).
> 
> To workaround this, i use the attached patch, which disable unaligned
> memory access. I never had a single SIGBUS crash since.
> 
> I didn't notice any performance change, I guess it might be slower.
> I think we can do a little bench (edward ? :) ), and push it if it's
> acceptable.
> 
> What do you think ?
> 
> 
> 
> _______________________________________________
> Android mailing list
> Android at videolan.org
> http://mailman.videolan.org/listinfo/android
>