Acceleration in our pockets

[Carsten Haitzler (The Rasterman)]

On Thu, 12 Jun 2008 13:08:46 +0200 Peter Nijs <peter at familienijs.be> babbled:

> Op Tuesday 10 June 2008 10:11:23 schreef Andy Green:
> > Somebody in the thread at some point said:
> > | I have seen it this morning in the planet.openmoko.com,
> > | http://unadventure.wordpress.com/2008/06/08/accelerating-in-my-pocket/
> > |  Andrzej "balrog-kun" Zaborowski was able to use mplayer with glamo
> > | hardware acceleration Not all is lost to have some decent(not
> > | excelent but barelly usable is enough) video playback, or Rasterman
> > | has bad news again? ;)
> > |
> > | Of course I understand than use sd-card as storage will be not an
> > | option(shared bus issue) but a nfs mounted volume or a streaming mp4
> > | source can be an option I guess
> >
> > Wah that was really good progress from Andrzej.
> >
> > I wouldn't give up on SD card as storage without trying it: if I
> > understood what goes on then only the MP4 compressed stream is being
> > sent to the Glamo by mplayer... I guess it means 100 - 200KBytes/sec
> > which is way below the point we choke the Glamo memory bus.  So we
> > should be able to be pulling 200 - 300KBytes/sec (including audio) at
> > the same from from SD.
> >
> > The wildcard is what the MPEG decoder unit in the Glamo is doing from
> > the inside in terms of hogging the internal memory.
> >
> > -Andy
> 
> Isn't the shared bus an advantage because now it can use DMA? Maybe that's
> why it is possible to hook up an sd-card to the glamo anyway. I see no other 
> explanation why one would put an sd cardreader in a graphics ship. Please 
> tell me if and why I'm wrong.

as such the sd io overhead compared to the overhead of uploading yuv data is
minimal/nothing. lots of details have been gone over here before with regard to
the glamo and video acceleration for video (yuv) playback.


-- 
Carsten Haitzler (The Rasterman) <raster at openmoko.org>