power-of-two buffer size. (was: Re: [LAD] [ANN] LV2 beta3)

Pieter Palmers pieterp at joow.be
Fri May 11 09:50:17 UTC 2007

Florian Schmidt wrote:
> On Wednesday 09 May 2007, Dave Robillard wrote:
>> If you want to discuss fixed block sizes, etc, discuss the existing work
>> done in that area by tapas (who has longed for that feature for ages
>> now, and I assume from the lack of objections from him that things are
>> fine on that front).  There is already a solution to this, if you have a
>> problem with the solution, let it be known.
> Yep, no objections :) As these extensions (fixed-buffersize and 
> power-of-two-buffersize) are rather easy to implement, especially for jack 
> apps where the API guarantees a fixed power of two buffersize in between 
> buffer-size callbacks [aha - this should be an extension, too ;)], i hope all 
> LV2 hosts which are useful [for me] at all will support it :) So i considered 
> this problem solved.
I don't think the power-of-two buffersize is guaranteed by the jack API. 
It is true that the ALSA backend wants the buffers to be a power of two. 
  But AFAIK it is not an API guarantee.

If I'm wrong, I'll have to fix the freebob backend because it doesn't 
enforce this.


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