Thread: MPlayer which version is suitable
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Serge is offline Serge
2006-10-02 , 11:09
Posts: 503 | Thanked: 267 times | Joined on Jul 2006 @ Helsinki
#220
Originally Posted by smackpotato
2serge mp3 decoding is not handled by the system on chip dsp but by a specialized codec dsp. this can be confermed by running
cat /sys/devices/platform/dsp/loadinfo
this leave 70% of the dsp for othr tasks such as scaling.. dspfbsink handles scaling i guess through the on chip dsp. I will try to make a driver for this.
I don't know how dspfbsink manages scaling and if it is any good, that's essentially a black box as all the other closed source plugins on Nokia 770. After, dealing with audio decoding using gstreamer sinks, I would prefer to stay away from it for a while

As for scaling using DSP chip, seems like it should be possible in spite of the previous unsuccessful attempt. I got some docs in .pdf's descriping Nokia 770 DSP core (C55x), and looks like it can be actually good for scaling. Here is the description of additional extensions that seem to be supported by OMAP1710 DSP core: http://focus.ti.com/lit/ug/spru098/spru098.pdf
Check "Pixel interpolation Hardware Extension" part

There are also lots of references to other docs, they are quite interesting to read.

And in general, DSP does not seem so bad from looking its presentation and benchmark results: http://www.omimo.be/magazine/01q2/2001q2_p034.pdf

but since i am starting with next to no knowladge im sure it will take me to the end of jjanuary. january is also when ill have some free time.
thankyou
Well, it is good to know, but I hope that all the most important mplayer porting work will be finished by that time already Anyway if things will not proceed as good as expected, your help will be welcome in January