Date: Tue, 18 Apr 2023 23:42:49 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Trevor Arjeski <tmarjeski@gmail.com>, freebsd-multimedia@freebsd.org Subject: Re: Possibility of remapping USB PCM device Message-ID: <0b5091eb-342f-5e0f-2b6e-01c1b6a8af70@selasky.org> In-Reply-To: <CACPvkDz4NT4RFfUxzd87P%2B2iL8to9owtzVH8bCZV-To8C7fn1w@mail.gmail.com> References: <CACPvkDz4NT4RFfUxzd87P%2B2iL8to9owtzVH8bCZV-To8C7fn1w@mail.gmail.com>
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On 4/18/23 20:56, Trevor Arjeski wrote: > Hi all, > I am new to FreeBSD and I am in the midst of setting up things the way I > like them on my desktop. I have a strange USB headset that requires a > special configuration on linux - pulseaudio includes this configuration, > and I was wondering if there is a possibility it can be done in FreeBSD. > > Below is a description of the device from the pulseaudio source code from > this commit > https://github.com/pulseaudio/pulseaudio/commit/814419cc3d788acb9113a3d62c373deb1a911e75 > > | Steelseries Arctis 7 USB headset mono output path. The headset has two > | output devices. The first one is mono, meant for voice audio, and the > | second one is stereo, meant for everything else. The purpose of this > | unusual design is to provide separate volume controls for voice and > | other audio, which can be useful in gaming. > | This path doesn't provide hardware volume control, because the stereo > | output is controlled by the PCM element with index 1, and currently > | PulseAudio only supports elements with index 0. > > The last sentence is what I am trying to achieve, somehow, so that I can > control the volume. > > I have already gone through all the sysctl's on the two pcm devices, and > messed with all the available mixer settings. My assumption is that FreeBSD > is doing what Linux was doing before the pulseaudio patch - not allowing > "index 1" - whatever that means. > > Any information is welcome. I would even be interested in patching some of > the driver code for my own learning (doesn't need to go upstream). I am > running CURRENT and can rebuild the system and kernel. > > Thanks. > Hi, Maybe virtual_oss (my own invention) can solve your problem. It allows you to create a virtual /dev/dsp device. During usage you can run: virtual_oss_cmd /dev/vdsp.ctl -P /dev/dspX To change the playback device only, or -f to change both. Then all applications using /dev/dsp follow this change, with no need to restart anything! --HPS
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