Re: kern/55687: Slowed down/noisy recording with audio(4) (probably incorrect sample rate)

[Leonardo Taccari <leot%NetBSD.org@localhost>]

The following reply was made to PR kern/55687; it has been noted by GNATS.

From: Leonardo Taccari <leot%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/55687: Slowed down/noisy recording with audio(4) (probably incorrect sample rate)
Date: Thu, 01 Oct 2020 14:59:14 +0200

 Hello Tetsuya,
 
 Tetsuya Isaki writes:
 > [...]
 > Thank you for detailed report.
 >
 > This uploaded WAV file appears to have four channels data like as
 > L,R,0,0, L,R,0,0, ... in 48kHz, despite WAV file header says two
 > channels 48kHz.
 >
 > I found that this is because of record source has two inputs at
 > the same time on mixerctl.  You will solve it by selecting one
 > recording source:
 >
 >  # mixerctl -w record.source={ADC01|ADC02}
 >
 > I could reproduce it on NetBSD 9.0 and 7.1 hdafg on my laptop,
 > so this is not a new problem.
 > (And I agree that mixerctl is not user-friendly...)
 > [...]
 
 Wow, I can confirm that doing `mixerctl -w record.source=ADC01' fixes
 this problem!  Thank you very much!
 
 On all my machines I usually have `mixerctl=yes' and
 `mixerctl_mixers="mixer0"' in rc.conf so I will probably forget
 about it.
 
 Should we leave this PR open and maybe adjust/add Subject: a short
 summary of your analysis and/or to possibly help if other folks hit this
 problem? (In any case feel free to possibly update the State:/Subject:
 or any other possible PR fields)
 
 
 Thank you very much again Tetsuya!