Re: kern/52175: audio sometimes stutters

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR kern/52175; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/52175: audio sometimes stutters
Date: Tue, 25 Apr 2017 22:20:07 +0200

 On Tue, Apr 25, 2017 at 10:17:35PM +0200, Manuel Bouyer wrote:
 > [...]
 > I'm also hearing problems on a allwinner A20 (920Mhz ARM cortex-A7),
 > which seems related to ossaudio. When playing a file with mplayer
 > (which, I believe, uses ossaudio), there is stops and clicks
 > in the output. Playing the same file with audioplay is as perfect
 > as it can be. The file is:
 > RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 44100 Hz
 > 
 > Also, playing a sound from opencpn (which uses portaudio2, which uses
 > ossaudio). It hangs. ktrace shows what looks like an endless loop writing
 > the same 64k data block again and again (the file itself is less than 128KB,
 > but larger files shows the same behavior), at a very low rate.
 > I don't hear anything on output but maybe that's because the file
 > is played at a very low rate.
 
 Note that the hardware can only do 48Khz, 16 or 24 bits.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --