Date: Thu, 24 Jul 1997 09:23:33 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: rhh@ct.picker.com (Randall Hopper), louie@TransSys.COM, multimedia@FreeBSD.ORG Subject: Re: sb16 request Message-ID: <199707241623.JAA14076@rah.star-gate.com> In-Reply-To: Your message of "Thu, 24 Jul 1997 15:43:15 %2B0200." <199707241343.PAA26156@labinfo.iet.unipi.it>
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>From The Desk Of Luigi Rizzo : > Hi, > > I am looking at the sb16 operation in full duplex using dual dma (one > 8-bit, the other 16-bit): > > Which one fo the following approaches people prefers: > > 1. always use 16-bit for play, 8-bit for record; > 2. always use 16-bit for record, 8-bit for play; > 3. allocate the 16-bit channel to the first type of request (read or > write) and use the 8-bit channel for the other one. > > or > > 4. define a new ioctl to chose which channel gets the 16-bit dma and > which one gets the 8-bit dma, with some default camong those > described before. I prefer an ioctl to chose which channel is for 16 bit . If I had to hardwired the choice , I would chose , 16 bit for recording and 8 bit for playback. Amancio
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