[MPlayer-users] AO_ALSA: Using SND_PCM_ACCESS_MMAP_INTERLEAVED.

[Michaël Cadilhac]

michael at cadilhac.name (Michaël Cadilhac) writes:

>   Hi there, people!
>
>   In February 2006 [1], mmap support has been disabled in AO_ALSA.  The
> reason was, IIUC, that the implementation was basically a generic
> implementation of non-mmap access using mmap.
>
>   I currently own a Tacsam US144, a usb sound card, which has very
> specific drivers from alsa-plugins (called usb_stream).  The problem is,
> the device only allows SND_PCM_ACCESS_MMAP_INTERLEAVED access type,
> which causes mplayer to refuse playing on the device (well, it causes it
> to fail setting access type indeed... ao_alsa.c:529).
>
>   I have one simple question : who's to blame? :-) Mplayer could be the
> culprit for being narrow minded about which access type it can deal
> with, although it could emulate it for other access types.  On the other
> hand, maybe the usb_stream plugin should provide RW_INTERLEAVED access
> (possibly by simply wrapping the mmap access).
>
>   Any answer very much appreciated!
>
>   Have a great day.
>
> Footnotes: 
> [1]  http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-February/040295.html

Any chance ?

-- 
Michaël `Micha' Cadilhac (LITQ, U. de Montréal) -- http://michael.cadilhac.name
	|| La culture c'est comme la confiture,
	||     c'est meilleur avec du pain.
	||          -- MOI59