[Bug 208791] USB audio playback issue

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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 at FreeBSD.org
          Reporter: alex at inferiorhumanorgans.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at 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: <AudioQuest inc. AudioQuest DragonFly, class 0/0, rev 1.00/1.0c, addr
10> 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: <USB audio> 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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