Date: Sun, 8 Oct 2017 17:28:25 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Alexander Leidinger <Alexander@leidinger.net> Cc: freebsd-usb@freebsd.org Subject: Re: uaudio - distorted output Message-ID: <21e04dc4-045d-fb30-337a-7f7bd4fe8b50@selasky.org> In-Reply-To: <20171008142514.Horde.hRkzth4Ur4wvjgUIlWuc70c@webmail.leidinger.net> References: <20171008125631.Horde.ZsqSFDr1-uiT1YrkgH5i0tF@webmail.leidinger.net> <633f23dd-3b61-fe17-b894-6b1221a5dfd4@selasky.org> <20171008142514.Horde.hRkzth4Ur4wvjgUIlWuc70c@webmail.leidinger.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On 10/08/17 14:25, Alexander Leidinger wrote: > > Quoting Hans Petter Selasky <hps@selasky.org> (from Sun, 8 Oct 2017 > 13:19:19 +0200): > >> 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? > > current as of r323636 > >> Try to enable hw.usb.uaudio.debug=16 during playback. > > No such sysctl, only hw.usb.debug.... > I did the hw.usb.debug=16, but no output in dmesg nor > /var/log/console.log nor /var/log/messages, where do I need to look? > > Bye, > Alexander. > Can you compile and install snd_uaudio module with DEBUG_FLAGS="-DUSB_DEBUG" and KMODDIR=/boot/kernel ? --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?21e04dc4-045d-fb30-337a-7f7bd4fe8b50>