Date: Thu, 21 Jul 2005 21:55:14 +0800 (WST) From: David Adam <zanchey@ucc.gu.uwa.edu.au> To: Josef Karthauser <joe@FreeBSD.org> Cc: stable@FreeBSD.org, multimedia@freebsd.org Subject: Re: Multiple consumers of /dev/dsp Message-ID: <Pine.LNX.4.58.0507212152150.2843@mussel.ucc.gu.uwa.edu.au> In-Reply-To: <20050721134345.GQ73338@genius.pact.cpes.susx.ac.uk> References: <20050721134345.GQ73338@genius.pact.cpes.susx.ac.uk>
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Josef, On Thu, 21 Jul 2005, Josef Karthauser wrote: > In the past I'm sure that we supported the mixing of audio in the kernel > so that multiple applications could open /dev/dsp at the same time. Was > this a function of the audio card driver, or of the audio subsystem? > Currently on my new machine I don't get any mixing, and applications > fail to open /dev/dsp if it's already open by something. > > The current hardware is: > > FreeBSD Audio Driver (newpcm) > Installed devices: > pcm0: <Intel ICH4 (82801DB)> at io 0xee00, 0xe000 irq 9 bufsz 16384 kld > snd_ich (1p/1r/0v channels duplex default) > > Am I imagining that this use to the case or isn't it enabled by default? It's not on by default, AFAIK, but setting a couple of sysctls will allow you to have more than one program playing sound at once. # sysctl hw.snd.pcm0.vchans=4 # sysctl hw.snd.maxautovchans=4 Check out http://www.freebsd.org/doc/handbook/sound-setup.html#AEN8582 (the section titled 'Utilizing Multiple Sound Sources'). Cheers, David Adam zanchey@ucc.gu.uwa.edu.au
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