22 Apr
2005
22 Apr
'05
6:33 p.m.
On Fri, Apr 22, 2005 at 06:23:51 +0200, Olivier Guilyardi wrote:
Steve Harris wrote:
I mean that the CPU load should be the same from call to call, assuming
hte user hasn't changed any settings or whatever.
On Fri, Apr 22, 2005 at 05:13:47PM +0200, Olivier
Guilyardi wrote:
By deterministic do you mean that the CPU time consumed by a given
process() should remain (quite) the same for each call ? Do you mean
that Jack mesures it and adapt consequently ? In Jackbeat, I want to include support for
realtime pitch shifting.
Can I do that in the jack process callback ? Or should I span a new
thread and do the heavy job in there, ringbuffer'ing the result to the
RT thread ?
Doing heavy jobs in the process() callback is fine, as long as the CPU
load is deterministic. I this case I think it should be.
Say the user starts a raw playback, and then choose to
add
pitch-shifting, while playing. The CPU load would suddenly increase. Is
this bad ?
No, as long as it stays at that level. Problems come when for eg. the CPU
load is very high for a few cycles, then goes low for a bit, then high
again, without any configuration changes being made.
- Steve