Re: static snd_pcm_uframes_t snd_aicapcm_pcm_pointer(snd_pcm_substream_t *substream)

[Adrian McMenamin <adrian@mcmen.demon.co.uk>]

On Sat, 2006-02-25 at 20:48 -0500, Lee Revell wrote:
> On Fri, 2006-02-24 at 20:41 +0000, Adrian McMenamin wrote:
> > What should my pointer callback return - is it the number of frames
> > still to come from the dma transfer or the number of frames still to
> > play in the device's buffer, or something else?
> > 
> 
> http://www.alsa-project.org/~iwai/writing-an-alsa-driver/x639.htm#PCM-INTERFACE-OPERATORS-POINTER-CALLBACK


The problem with that - which I have read many times and even host
locally - http://newgolddream.dyndns.info/alsa - so I have a copy that
is very easily accessible is that:

"This callback is called when the PCM middle layer inquires the current
hardware position on the buffer." 

Could mean any number of different things because there is more than one
buffer here.

As it is James Courtier-Dutton has clarified this for me.

But one more question: what is the different between this and the
interrupt handling? Are they both seeking to do the same thing?



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