Date: Fri, 10 Apr 2020 20:25:25 +0200 From: Harry Schmalzbauer <freebsd@omnilan.de> To: freebsd-stable@freebsd.org Subject: Audio mixer and mixer control Message-ID: <426353fd-bb39-5bba-5ca1-af00a8b8ff4e@omnilan.de>
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Hello, today I wanted to utilize my optical S/PDIF out with an external D/A converter to empower my garden radio. Unfortunately, it seems mixer(8) isn't really doing what I understand a mixer's job is. As far as I understood, mixer(8) is just controlling/pushing settings to the dsp's specific hardware mixer (if that's true, mixctl(8) was more clear e.g.). So if I have dsp0 with line-in and line-out, and dsp3 with a S/PDIF out, there's no way to get the dsp0-"mix" over to dsp3? What I'm looking for is a mixer which processes various input sources and sends them to arbitrary output devices. Does anybody know if there's such kind of mixer available? Or is it possible to interconnect different dsp channels? (ugh, I don't really know anything about contemporary audio hardware :-( ) I also have problems understanding the mixer(8) channels. Hard to find the corresponding dsp channel... The relation of "speaker", "mix", the invible "monitor" and "rec" is completely unclear to me, likewise the difference of "vol" and "pcm". Is it common that S/PDIF out is a separate dsp? I never had to investigate on other OS, where I get the same signal on analog and digital outputs simultaniously. Thanks for any hints, -harry
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