On Thu, 21 Sep 2006 14:09:30 +0200 Tomas Carnecky <[EMAIL PROTECTED]> wrote:
> Sergei Steshenko wrote: > > I might be wrong, but it seems that 4096 bytes limit comes from these > > facts: > > > > 1) on Linux page size is 4096 bytes; > > 2) if one allocate more than 4096 bytes, the system cannot guarantee the > > pages are contiguous; > > 3) ALSA uses DMA whenever the card supports it; > > 4) DMA needs contiguous buffer, so we are back to one page 4096 bytes > > buffer. > > It's a windows application running through wine. This app uses dsound > and I configured wine to use the alsa driver. > > If we're at it, can I snd_pcm_mmap_begin()/commit() more than 4096 > bytes? It seems as at it's possible since wine's alsa driver does that > on the whole buffer, which can be more than 4096 bytes. Does the alsa > driver allocate DMA memory in that case? > > tom > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > I am not an ALSA developer, so I do not know. --Sergei. -- Visit my http://appsfromscratch.berlios.de/ open source project. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
