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Re: [PATCH v2 0/3] USB Audio Gadget refactoring

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Peter Chen wrote:
> I find UAC2 (UAC1 is ok)  support is not well with the latest mainline
> kernel w/o your patch set. The windows7 can't install the driver
> successfully

Windows does not have UAC2 support.

> and the playback shows underrun (using local codec)
> using Linux host.

> # arecord -f dat -t wav -D hw:1,0 | aplay -D hw:0,0 &

The clocks of the two devices are not synchronized.

In the ALSA API, a PCM device is assumed to have its own clock, so it is
not possible to synchronize the USB gadget to the actual sound device
without some separate mechanism (like the old uac1 gadget probably has).


Regards,
Clemens

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[PATCH v2 0/3] USB Audio Gadget refactoring Ruslan Bilovol <ruslan.bilovol@gmail.com> - 2016-08-14 12:10 +0200
  [PATCH v2 3/3] usb: gadget: add f_uac1 variant based on new u_audio api Ruslan Bilovol <ruslan.bilovol@gmail.com> - 2016-08-14 12:40 +0200
    Re: [PATCH v2 3/3] usb: gadget: add f_uac1 variant based on new  u_audio api Peter Chen <hzpeterchen@gmail.com> - 2016-08-16 05:10 +0200
      Re: [PATCH v2 3/3] usb: gadget: add f_uac1 variant based on new  u_audio api Ruslan Bilovol <ruslan.bilovol@gmail.com> - 2016-08-16 22:40 +0200
  [PATCH v2 1/3] usb: gadget: f_uac2: remove platform driver/device creation Ruslan Bilovol <ruslan.bilovol@gmail.com> - 2016-08-14 13:00 +0200
  Re: [PATCH v2 0/3] USB Audio Gadget refactoring Peter Chen <hzpeterchen@gmail.com> - 2016-08-16 11:30 +0200
    Re: [PATCH v2 0/3] USB Audio Gadget refactoring Clemens Ladisch <clemens@ladisch.de> - 2016-08-16 11:40 +0200
      Re: [PATCH v2 0/3] USB Audio Gadget refactoring Peter Chen <hzpeterchen@gmail.com> - 2016-08-16 12:00 +0200
        Re: [PATCH v2 0/3] USB Audio Gadget refactoring Clemens Ladisch <clemens@ladisch.de> - 2016-08-16 12:20 +0200
    Re: [PATCH v2 0/3] USB Audio Gadget refactoring Ruslan Bilovol <ruslan.bilovol@gmail.com> - 2016-08-16 22:50 +0200

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