Date: Thu, 19 Feb 1998 17:30:27 -0500 From: Randall Hopper <rhh@ct.picker.com> To: Scott Michel <scottm@cs.ucla.edu> Cc: freebsd-multimedia@FreeBSD.ORG Subject: Re: Just what is SNDCTL_DSP_SUBDIVIDE? Message-ID: <19980219173027.24022@ct.picker.com> In-Reply-To: <199802160608.WAA00315@mordred.cs.ucla.edu>; from Scott Michel on Sun, Feb 15, 1998 at 10:08:03PM -0800 References: <199802160608.WAA00315@mordred.cs.ucla.edu>
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Scott Michel: |Not being an up-to-speed geek on sound drivers, would someone tell me |just what SNDCTL_DSP_SUBDIVIDE is supposed to do? Hannu's old Voxware SDK doc has a decent description. I dropped a copy off at Amancio's site a while back (ftp://rah.star-gate.com/snd-sdk-doc-0.1.ps.gz). The ioctl(fd, SOUND_PCM_SUBDIVIDE, &div) is a new call which requests the driver to use smaller buffers. The value in the parameter (div) should be 1, 2 or 4. After this call the driver will compute the buffer size by dividing the default buffer size by the requested value. This makes the buffer up to 4 times shorter than the default. Randall To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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