Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-28 Thread Paul Davis
>I've looked through some driver code, and if I understand it correctly, >it seems like some drivers, for example the ens1370, check in the >trigger function the substream is linked with other substreams on the yes, sorry, i forgot about this aspect of things. i was thinking of snd_pcm_link()

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-28 Thread Paul Davis
>By the way, I tried to search for the same code in rme9652.c, and found >something similar, but it does not seem to activate both capture and >playback with a single write to the control register. I'm not sure how >the hardware works (nor the driver) though so I may be wrong. there are no di

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-28 Thread Anders Torger
On Sunday 28 July 2002 15.54, you wrote: > >The way you'd do this is to link the capture and playback streams of > >the device you use with snd_pcm_link(). They will start together and > > we still haven't established the timing for this. its possible that > its not fast enough for the two streams

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-28 Thread Paul Davis
>The way you'd do this is to link the capture and playback streams of >the device you use with snd_pcm_link(). They will start together and we still haven't established the timing for this. its possible that its not fast enough for the two streams to be started within <<1sample, particularly if a

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-28 Thread Tim Goetze
Anders Torger wrote: >On Saturday 27 July 2002 17.18, you wrote: >> Anders Torger wrote: >> >Does anyone have any comments on this? Is repeatable exact I/O-delay >> >possible to achieve today with current hardware (and ALSA)? >> >> It is the normal mode of operation for memory-mapped IO. > >Is it

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-27 Thread Anders Torger
On Saturday 27 July 2002 17.18, you wrote: > Anders Torger wrote: > >Does anyone have any comments on this? Is repeatable exact I/O-delay > >possible to achieve today with current hardware (and ALSA)? > > It is the normal mode of operation for memory-mapped IO. Is it really? How do I trigger play

Re: [Alsa-devel] Repeatable exact I/O-delay

2002-07-27 Thread Tim Goetze
Anders Torger wrote: >Does anyone have any comments on this? Is repeatable exact I/O-delay >possible to achieve today with current hardware (and ALSA)? It is the normal mode of operation for memory-mapped IO. The only thing that could change the delay is your application taking too long to pro