Date: Tue, 31 Mar 2020 14:44:12 +0200 From: Hans Petter Selasky <hselasky@freebsd.org> To: Alexander Leidinger <Alexander@leidinger.net> Cc: usb@freebsd.org Subject: Re: svn commit: r359446 - head/sys/dev/sound/usb Message-ID: <86ef6d1a-46ae-ab23-5ff3-ec594945d57b@freebsd.org> In-Reply-To: <20200331143524.Horde.ysDNb7YHa282XO7TaHD7KeV@webmail.leidinger.net>
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On 2020-03-31 14:35, Alexander Leidinger via freebsd-usb wrote: > Quoting Hans Petter Selasky <hselasky@freebsd.org> (from Mon, 30 Mar > 2020 16:50:33 +0000 (UTC)): > >> Author: hselasky >> Date: Mon Mar 30 16:50:32 2020 >> New Revision: 359446 >> URL: https://svnweb.freebsd.org/changeset/base/359446 >> >> Log: >> Add support for multiple playback and recording devices per physical >> USB audio >> device. This requires some structural refactoring inside the driver, >> mostly >> about converting existing audio channel structures into arrays. >> >> The main audio mixer is provided by the first PCM instance. >> The non-first audio instances may only have a software mixer for PCM >> playback. > > Have you thought about providing different pcm devices per physical USB > audio device for the functionality of dev.pcm.X.Y.vchanformat / > vchanrate? Incompatible configs between those devices could be prevented > at runtime via setting all the incompatible devices per physical device > to return EBUSY or such while one of the group is open / in use. > /dev/sndstat could also contain some kind of status to this effect and > to which group of pcm devices pcmX belongs. > Hi, There will be two pcm devices, belonging to the same uaudioX device having each their independent sysctl tree. So you get: /dev/dsp0 /dev/mixer0 /dev/dsp1 /dev/mixer1 mixer1 only controls dsp1, and mixer0 only controls dsp0, while it may be the same physical USB audio device. Was this your question? --HPShome | help
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