[Bug 208791] USB audio playback issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

Hans Petter Selasky  changed:

   What|Removed |Added

   Assignee|freebsd-usb@FreeBSD.org |hsela...@freebsd.org

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[Bug 208791] USB audio playback issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

metsuke  changed:

   What|Removed |Added

 CC||mets...@protonmail.com

--- Comment #5 from metsuke  ---
Perhaps this is the same issue that causes my Razer Megalodon (USB headset) to
constantly crackle as well.  It was nearly fixed by hselasky's suggestion: 
-
Edit:

sys/dev/usb/usb_freebsd.h

And change:

#define USB_FS_ISOC_UFRAME_MAX 4 /* exclusive unit */

Into:

#define USB_FS_ISOC_UFRAME_MAX 5 /* exclusive unit */

Then re-build the kernel.
-

There is still a crackle for 2 seconds every time a new audio stream starts,
but it goes away after that.  I thought the 11.0 upgrade would fix this, but I
still need a custom kernel.  If this is not the same issue, I'll open a new
one, thanks.

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[Bug 208791] USB audio playback issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

--- Comment #4 from a...@inferiorhumanorgans.com ---
I believe I purchased mine from Amazon, although the version I have (1.2, IIRC)
has since been discontinued.

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[Bug 208791] USB audio playback issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

--- Comment #2 from a...@inferiorhumanorgans.com ---
With this kernel:

FreeBSD bloaty 10.3-RELEASE-p4 FreeBSD 10.3-RELEASE-p4 #0: Sat May 28 12:23:44
UTC 2016 r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC 
amd64

And hw.snd.verbose=4

I see:

pcm3: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=0, old=0
delta=0 amt=0 ready=4236 free=0

With hw.usb.uaudio.debug=15

I see:

uaudio_chan_play_sync_callback: Comparing 44149 Hz :: 44100 Hz

This doesn't appear to vary, and has appeared consistent with the 10.3 kernels.
 The same hardware worked without fault in 9.x.  Sorry for the delay, but this
machine is unsuitable for audio playback currently so I've not tried in a
while.

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[Bug 208791] USB audio playback issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

Hans Petter Selasky  changed:

   What|Removed |Added

 CC||hsela...@freebsd.org

--- Comment #1 from Hans Petter Selasky  ---
Can you collect a few of these and show how they change over time?

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[Bug 208791] USB audio playback issue

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208791

Bug ID: 208791
   Summary: USB audio playback issue
   Product: Base System
   Version: 10.3-RELEASE
  Hardware: amd64
OS: Any
Status: New
  Severity: Affects Only Me
  Priority: ---
 Component: usb
  Assignee: freebsd-usb@FreeBSD.org
  Reporter: a...@inferiorhumanorgans.com
CC: freebsd-am...@freebsd.org
CC: freebsd-am...@freebsd.org

Using a USB DAC (AudioQuest DragonFly) I get clicking and popping (vinyl-like).
 With FreeBSD 9.3 I was able to get clean output by setting the default sample
rate to 44100.  With 10.3 that is not the case.

This is the device:

uaudio0:  on usbus1
uaudio0: Play: 44100 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Play: 96000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Play: 88200 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Play: 48000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Play: 44100 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer.
uaudio0: No recording.
uaudio0: No MIDI sequencer.
pcm3:  on uaudio0
uaudio0: No HID volume keys found.

# sysctl dev.pcm.3
dev.pcm.3.feedback_rate: 44049
dev.pcm.3.mixer.mute_1.desc: AudioQuest DragonFly
dev.pcm.3.mixer.mute_1.max: 1
dev.pcm.3.mixer.mute_1.min: 0
dev.pcm.3.mixer.mute_1.val: 0
dev.pcm.3.mixer.vol_0_1.desc: AudioQuest DragonFly
dev.pcm.3.mixer.vol_0_1.max: 53
dev.pcm.3.mixer.vol_0_1.min: 0
dev.pcm.3.mixer.vol_0_1.val: 29
dev.pcm.3.mixer.vol_0_0.desc: AudioQuest DragonFly
dev.pcm.3.mixer.vol_0_0.max: 53
dev.pcm.3.mixer.vol_0_0.min: 0
dev.pcm.3.mixer.vol_0_0.val: 29
dev.pcm.3.bitperfect: 0
dev.pcm.3.buffersize: 0
dev.pcm.3.play.vchanformat: s16le:2.0
dev.pcm.3.play.vchanrate: 44100
dev.pcm.3.play.vchanmode: fixed
dev.pcm.3.play.vchans: 1
dev.pcm.3.hwvol_mixer: vol
dev.pcm.3.hwvol_step: 5
dev.pcm.3.%parent: uaudio0
dev.pcm.3.%pnpinfo: 
dev.pcm.3.%location: 
dev.pcm.3.%driver: pcm
dev.pcm.3.%desc: USB audio

I do seem to see these with debugging turned up:

uaudio_chan_play_sync_callback: Comparing 44149 Hz :: 44100 Hz

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