[alsa-devel] alsa compliance test: H340 (USB audio) playback / capture rate asymmetry bug?

[Yu-Hsuan Hsu]

Pavel Hofman <pavhofman at gmail.com> 於 2019年9月16日 週一 下午7:55寫道：

>
> This topic seems quite similar to my thread about measuring average throughput for asynchronous feedback https://www.spinics.net/lists/alsa-devel/msg96781.html . I perfectly understand the motivation :-)
>
> Perhaps that inexpensive headset is not really async playback, but standard adaptive, reporting incorrect USB header? Then capture (async = internal clock) would differ from playback (adaptive = USB controller clock).
>
> Regards,
>
> Pavel.

Hi Hin-Tak,

Sorry for the late reply.
The log looks normal. I can not find any obvious problem within this
log. As Pavel said, they use the different clock. So I think it may be
the problem of that headphone.
Do other USB headphones also have this problem?

Best,
Yu-Hsuan