Date: Sun, 8 Oct 2017 13:19:19 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Alexander Leidinger <Alexander@leidinger.net>, "freebsd-usb@FreeBSD.org" <freebsd-usb@FreeBSD.org> Subject: Re: uaudio - distorted output Message-ID: <633f23dd-3b61-fe17-b894-6b1221a5dfd4@selasky.org> In-Reply-To: <20171008125631.Horde.ZsqSFDr1-uiT1YrkgH5i0tF@webmail.leidinger.net> References: <20171008125631.Horde.ZsqSFDr1-uiT1YrkgH5i0tF@webmail.leidinger.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On 10/08/17 12:56, Alexander Leidinger wrote: > > Hi, > > attached are the config descriptors and the device dump of two uaudio > devices. Both exhibit distorted audio output. It sounds a little bit > like clipping / not feeding enough samples fast enough... > > I played around with dev.pcm.2.bitperfect=1, dev.pcm.2.play.vchans=0, > dev.pcm.2.play.vchanrate and hw.snd.latency=1...10. > > At some point vchanrate doesn't work anymore, it always stays at 4.0 > audio, even when trying to go back to 2.0. I have to usbconfig reset the > device. > > Sometimes (rarely) when playing around I get clear audio output, but > when I try to reproduce it (going back to default value for the last > sysctl setting and then going back again to the same setting again), the > audio is distorted again. > > To me it sounds like some kind of buffer is not big enough or the data > is not delivered fast enough to the uaudio device. But this is a > dual-socket system with: > CPU: Intel(R) Xeon(R) CPU E5620 @ 2.40GHz (2133.36-MHz > K8-class CPU) > FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs > FreeBSD/SMP: 2 package(s) x 4 core(s) x 2 hardware threads > And while playing around with uaudio the system has a load of around 1, > so I would expect CPU/RAM is not an issue here. Hi, What version of FreeBSD is this? Try to enable hw.usb.uaudio.debug=16 during playback. --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?633f23dd-3b61-fe17-b894-6b1221a5dfd4>