Re: uaudio - distorted output

Sun, 08 Oct 2017 14:09:25 -0700
Quoting Hans Petter Selasky <h...@selasky.org> (from Sun, 8 Oct 2017 17:28:25 +0200): 


On 10/08/17 14:25, Alexander Leidinger wrote:



Quoting Hans Petter Selasky <h...@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 ?


Occasionally I get this while playing:
---snip---
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: short transfer, 3680 of 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: short transfer, 3360 of 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: short transfer, 4224 of 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: short transfer, 4096 of 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
uaudio_chan_play_callback: transferring 4608 bytes
---snip---

The first number on the short transfer varies:
---snip---
# dmesg |grep "transferring 4608 bytes" | wc -l
    2738

# dmesg |grep "short transfer" | wc -l
     124

# dmesg |grep "short transfer" | sort | uniq -c
   1 uaudio_chan_play_callback: short transfer, 2176 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 2528 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 2624 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 2848 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 2976 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3008 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3040 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3104 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3136 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3168 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3264 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3296 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3328 of 4608 bytes
   4 uaudio_chan_play_callback: short transfer, 3360 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3424 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3456 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3520 of 4608 bytes
   4 uaudio_chan_play_callback: short transfer, 3552 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3584 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3616 of 4608 bytes
   4 uaudio_chan_play_callback: short transfer, 3648 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3680 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3712 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3744 of 4608 bytes
   4 uaudio_chan_play_callback: short transfer, 3776 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3808 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 3872 of 4608 bytes
   3 uaudio_chan_play_callback: short transfer, 3904 of 4608 bytes
   3 uaudio_chan_play_callback: short transfer, 3936 of 4608 bytes
   1 uaudio_chan_play_callback: short transfer, 3968 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4032 of 4608 bytes
  28 uaudio_chan_play_callback: short transfer, 4096 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4128 of 4608 bytes
   5 uaudio_chan_play_callback: short transfer, 4160 of 4608 bytes
   8 uaudio_chan_play_callback: short transfer, 4192 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4224 of 4608 bytes
   3 uaudio_chan_play_callback: short transfer, 4256 of 4608 bytes
   5 uaudio_chan_play_callback: short transfer, 4288 of 4608 bytes
   3 uaudio_chan_play_callback: short transfer, 4320 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4352 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4416 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4448 of 4608 bytes
   3 uaudio_chan_play_callback: short transfer, 4480 of 4608 bytes
   2 uaudio_chan_play_callback: short transfer, 4544 of 4608 bytes
---snip---

Bye,
Alexander.

--
http://www.Leidinger.net alexan...@leidinger.net: PGP 0x8F31830F9F2772BF
http://www.FreeBSD.org    netch...@freebsd.org  : PGP 0x8F31830F9F2772BF



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