Rockbox mail archive
Subject: Re: Buffer Underrun
From: gerald clark (gerald_clark_at_mindspring.com)
In view of your explanation, I have re-tested.
I wait for the drive to spin down before playing the MP3.
This assures a spin-up to get a proper water mark.
The watermark value is the same, no matter
what anti-skip is set to.
It always appears as A410.
I stop playing, and wait for the drive to spin down.
I play the file again, and the watermark includes
The water mark value does not include anti-skip
time until the 2nd spinup.
At this point, the buffer has underrun.
Linus Nielsen Feltzing wrote:
> gerald clark wrote:
>> It does not appear to be calculating the watermark on the first play.
> The watermark calculation is based on the hard drive spinup time, which
> is measured when the drive spins up. Tus, no watermark calculation can
> be done until that time is measured, that is when the drive spins up
> again after being idle.
> Until then, the default value of 0x60000 is used.
>> It does not appear to read the Anti skip value unless you change it.
> The watermark calculation includes the anti-skip time, and will not be
> used until the next spin-up.
Gerald L. Clark
Aero TerraTrike #1
Member: Sky Soaring
Archos Recorder JBR20101 1.28 0x302 positive 0x200 positive 11.0592
Page was last modified "Jan 10 2012" The Rockbox Crew