Date: Mon, 29 Mar 2021 11:24:19 +0300 From: Softwafe Engineer <timsofteng@gmail.com> To: Hans Petter Selasky <hps@selasky.org> Cc: freebsd-multimedia@freebsd.org Subject: Re: Distorted sound with external usb-device and bitperfect Message-ID: <CAP7bFfBAVF1NuVhXLrDMkHGnMZA=tn7taN4cxQGkwO4ogKHkCg@mail.gmail.com> In-Reply-To: <4938264f-686a-af1a-cb28-f39585b1375a@selasky.org> References: <CAP7bFfBhoHQXV%2BzpW3Sm%2BLcJh77U=KBoZzhJ6oxCxBABx3UPwQ@mail.gmail.com> <d7d15f35-f363-44df-bf05-c2253a5307d1@selasky.org> <CAP7bFfCRBnJh5k0fe8r9AnhzTh8FBO6_r=iu9D9qrwo-PTxD6A@mail.gmail.com> <4938264f-686a-af1a-cb28-f39585b1375a@selasky.org>
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Thanks a lot. But what application should do if file is in 16 bit? Should all files be converted to 32 bit? I supposed bitperfect sends pure stream without any converter. =D0=BF=D0=BD, 29 =D0=BC=D0=B0=D1=80. 2021 =D0=B3., 11:12 Hans Petter Selask= y <hps@selasky.org>: > On 3/29/21 6:59 AM, Softwafe Engineer wrote: > > Here is dmesg after motu m2 was plugged: > > > > https://pastebin.com/1mcQNn1H > > > > (is pastebin ok?) > > > > I've tried it in few music players which are could be find in ports > > - deadbeef > > - audacious > > > > Both sound distorted when I enable bitperfect and disable vchans. If > > not then sounds ok. > > > > I never try virtual_oss. I just would to send bitperfect sound from > > freebsd to motu m2 to listen music. > > > > Hi, > > I suspect the applications you are trying to use don't support 32-bit > mode via OSS. That's why you hear noise. They've configured something > else, like 16-bit or 24-bit mode. > > You could ktrace the application possibly to figure this out. It will > show all IOCTL's. > > Try to configure virtual_oss in bitperfect mode instead for a test. > > Beware that many applications that output 16-bit audio, don't properly > fill the lower bytes with noise when they resampling to 32-bit. That's > another reason to use virtual_oss :-) > > --HPS >
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