[Qemu-devel] [Bug 1492649] Re: QEMU soundhw HDA huge microphone lag

[Glenn Sommer]

I cannot figure out why - but, it would seem the input ringbuffer is not 
processed till the buffer is full.
As an ugly workaround, i tried to set the buffering attributes to the input 
section - which reduced the delay to less then a second. (important part here 
is ba.maxlength)

** Patch added: "pulseaudio-microphone-workaround.patch"
   
https://bugs.launchpad.net/qemu/+bug/1492649/+attachment/4733098/+files/pulseaudio-microphone-workaround.patch

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https://bugs.launchpad.net/bugs/1492649

Title:
  QEMU soundhw HDA huge microphone lag

Status in QEMU:
  New

Bug description:
  I use a Windows 7 x86_64 guest with VGA passthrough and -soundhw hda.
  The audio plays fine, but the microphone input is delayed by more than
  20 seconds.

  -soundhw ac97 does not have this delay but it has choppy sound
  playback and input.

  System:
  Arch linux
  Kernel: 4.1.6-1-ARCH
  Audio hardware: 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 
Family) HD Audio Controller
  Audio system: Pulseaudio 6.0

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