[linux-audio-dev] diskstream and jack

mdeboer at iua.upf.edu mdeboer at iua.upf.edu
Fri Jul 14 10:16:03 UTC 2006

Hi Conrad,

> Now the question:
> - The worker thread is faster then the jackthread. (Sure, it should be).

Faster, but it might be irregular. That's what determines the ringbuffer

> What
> is the usual way to pause the workerthread and wake up again, when the
> ringbuffer needs more data.

I use usleep, though I am suppose that's a bit crude.. Is the ringbuffer 
full? Then sleep a little bit. If not, read N samples from disk and write 
it in the buffer.

> -Which size should the ringbuffer have.

I think this depends on many factors, such as hard disk speed.

> - H oxw should the ringbuffer be initilized when starting to play?
> - Any small program to have look into or a good inroduction into pthreads?.

Another question is: how much time in advance should the workerthread 
start reading, in order the have the first buffer filled when the 
playerthread needs it?

I also observed that launching a thread can take a long time (esp. on
MacOSX), so I suppose you want to have the workerthread launched in 
advance, and make it start reading when you need it.


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