non-interleaved and interleaved access

non-interleaved and interleaved access

[nick]

Hi

I'd be grateful if someone could clarify the use of
SND_PCM_ACCESS_RW_NONINTERLEAVED and SND_PCM_ACCESS_RW_INTERLEAVED -
does it depend on the card whether its supported? i can't get
non-interleaved access to work on either my emu10k1 or intel8x0
(motherboard) card...

is this because of the cards or my code?

cheers

-nixx

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Re: non-interleaved and interleaved access

[Tim Goetze]

nick wrote:

>is this because of the cards or my code?

it's the hardware -- all hw i know of is hard-wired for one
of the two access types. interleaved is much more common.

tim



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Re: non-interleaved and interleaved access

[Bruce Paterson]

Tim Goetze wrote:
> nick wrote:
> 
> 
>>is this because of the cards or my code?
> 
> 
> it's the hardware -- all hw i know of is hard-wired for one
> of the two access types. interleaved is much more common.

I'll try and reply to this based on my experience, but I'm sure others 
can correct me !
Yes interleaved is more common on the hardware, and if you talk directly 
to the hw:0.0 interface this is all you can use.
If you use the plughw:0.0 interface, however, you can use interleaved or 
non-interleaved as the plug code modifies whatever you set to suit the 
hardware (including sizing and bit-rates).
I couldn't get the plughw interface to do this for ice1712, however (it 
simply didn't work), but this was with quite an early release of 0.9 
(rc2) and things may well have improved by now. Since then my 
application chnaged to use hw:0.0 directly so I haven't gone back to 
check....


-- 
Cheers,
Bruce
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