Date: Mon, 29 Mar 2021 10:51:19 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Softwafe Engineer <timsofteng@gmail.com> Cc: freebsd-multimedia@freebsd.org Subject: Re: Distorted sound with external usb-device and bitperfect Message-ID: <69e199f6-a3ac-db3b-c7a1-00001f750624@selasky.org> In-Reply-To: <CAP7bFfAQw2uJ%2Bkn7xC=Yis6iFrnh7qn%2BdbbULqARDRO-p5=bag@mail.gmail.com> 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> <CAP7bFfBAVF1NuVhXLrDMkHGnMZA=tn7taN4cxQGkwO4ogKHkCg@mail.gmail.com> <c2b50b48-f842-2509-2075-dd9d3c6e3d79@selasky.org> <CAP7bFfAQw2uJ%2Bkn7xC=Yis6iFrnh7qn%2BdbbULqARDRO-p5=bag@mail.gmail.com>
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On 3/29/21 10:47 AM, Softwafe Engineer wrote: > So I can't get true bitperfect right? I should convert signal before send > to card output anyway. As long as your USB audio device reports it only supports 32-bit as native format, then 16-bit bitperfect won't be possible. I think in Linux, ALSA automatically does audio format conversions. The choice is just if your application has to provide a certain format or not. Try to look at "top" under Linux while playing something and find who's doing the format conversion. --HPS
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