Re: [Jack-Devel] driver_null_cycle

Is Jack requesting samples to be dropped in the null_cycle ? For example 
if I am using a ring_buffer with a DMA loading it ... is it necessary to 
fast forward the beginning of the ring buffer by nframes ?

W.r.t. the driver_wait function, on the understanding that the system I 
am looking at uses a ring buffer and DMA, in your opinion, is it 
possible to re-use the dummy_driver_wait function ?

thanks
Matt



On 15/01/14 14:11, Paul Davis wrote:
>
>
>
> On Tue, Jan 14, 2014 at 10:01 PM, Matt Flax <[hidden] 
> <mailto:[hidden]>> wrote:
>
>     Hi there,
>
>     Can someone please clarify the driver_null_cycle function for me ?
>
>     The function is defined as so :
>     static int you_driver_null_cycle (you_driver_t *driver,
>     jack_nframes_t nframes);
>
>     My question is w.r.t. the nframes. Is this function meant to flush
>     nframes from the audio stream ?
>
>     Here is what is written in include/driver.h
>        The JACK engine will call this after the wait function (above) has
>        been called, but for some reason the engine is unable to execute
>        a full "cycle". the driver should do whatever is necessary to
>        keep itself running correctly, but cannot reference ports
>        or other JACK data structures in any way.
>
>
> "the driver should do whatever is necessary to keep itself running 
> correctly"
>
> that's about the core of it. what that is depends on the driver and in 
> turn on the device.
>

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