[vlc-devel] [RFC PATCH 2/2] wasapi: reduce audio buffer

Rémi Denis-Courmont remi at remlab.net
Thu Apr 5 17:24:41 CEST 2018

Le torstaina 5. huhtikuuta 2018, 13.36.20 EEST Thomas Guillem a écrit :
> On Thu, Apr 5, 2018, at 12:19, Rémi Denis-Courmont wrote:
> > In principles, the minimum safe value is twice the largest decoded audio
> > block. IIRC, WMA often makes 1 second blocks.
> How come ? Do you have any sources ? Does it still apply now with fast CPU /
> decoders ?

Uh, this is pretty basic packet buffering concept... Downstream needs slightly 
more than one ptime to not underflow, and upstream usually needs between zero 
and one ptime to do its processing on an ongoing basis.

And then you have the safety margin. Actually, triple ptime is a good rule of 
thumb that is used in some audio software.


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