[Mplayer-advusers] Bug? Anomalous CPU usage when playing HDTV clips.

[John Stebbins]

On Mon, 2004-04-12 at 13:06, D Richard Felker III wrote:
> > The driver does use a command to the hardware that says 
> > "switch buffers at next vblank".  But the way the driver was
> > implemented, they are only using one buffer at a time in this code
> > path (though 2 are allocated).  Before copying data into the next
> > buffer, they always wait for the previous buffer to become free. They
> > sit in a busy wait loop reading a status register until the
> > previous operation is complete.  Then they switch "current" buffers,
> > fill the "current" buffer, issue the command to refresh on vsync and
> > return.
> 
> Ah, this is brain damaged. The only correct way is triple-buffering.
> Can you fix the driver to triple-buffer so that it doesn't matter?
> 
> Rich
> 

Could you explain your triple-buffering idea in more detail.
I'm afraid I'm not picturing what you have in mind.

John