Ogg vorbis performance.

Sören Apel abraxa at dar-clan.de
Sun Jul 13 00:13:33 CEST 2008


On Sat, 2008-07-12 at 14:27 -0700, Russell Sears wrote:
> I've noticed that my freerunner is *almost* fast enough to play my ogg 
> vorbis files; running a second app, or even gpsd causes the media player 
> to skip, then to go silent.


> What's been done to get ogg vorbis to perform well so far?  ogg123, 
> oggdec seem to be able to decode in roughly 2/3's realtime, which is 
> similar to the CPU usage of openmoko-mediaplayer.

If I remember correctly it was a problem with the sample rate/sample
meaning that resampling had to take place - which eats CPU like candy.

> I noticed that gstreamer is using libvorbisi (tremor) since there is no 
> floating point unit.  It looks like there are three ways to make it go 
> faster:
>   - Tremolo, which is ARM specific, and claims 15-20% better performance
>   - _LOW_ACCURACY_ mode
>   - The "low-mem" branch of tremor
> Which of these have been tried so far?

None, as I didn't find the time unfortunately. 
You're more than welcome to try these :)


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