[linux-audio-dev] BruteFIR + jack = crackling noise?

Steve Harris S.W.Harris at ecs.soton.ac.uk
Mon Feb 24 11:28:00 UTC 2003


On Mon, Feb 24, 2003 at 04:54:56PM +0100, Martijn Sipkema wrote:
> [...]
> > many USB audio interfaces work in a fundamentally different way than
> > other audio interfaces. rather than sending an "interrupt" to the host
> > after processing 2^N frames, they send an interrupt every N
> > msecs. 
> 
> And JACK doesn't support this because it needs a constant size
> (frames) period. IMHO the audio interface should dictate the period
> size and it need not be constant.
> 
> Perhaps you would reconsider having JACK use constant (frames)
> callbacks?

I think a better solution might be to buffer up enough samples so that
jackd can provide a constant number of frames.

- Steve



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