Distorted sound with external usb-device and bitperfect

[Softwafe Engineer]

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.

пн, 29 мар. 2021 г., 11:12 Hans Petter Selasky <hps at 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
>