NetBSD-Bugs archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

kern/51760: audio playback sounds bad

>Number:         51760
>Category:       kern
>Synopsis:       audio playback sounds bad
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 02 10:00:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.53
The NetBSD Foundation, Inc.
System: NetBSD 7.99.53 NetBSD 7.99.53 (WHOEVER) #69: Wed Dec 28 20:52:33 CET 2016 sparc64
Architecture: sparc64
Machine: sparc64

After the audio mixing changes, playback of CD quality music sounds .. "worse".
There is a tiny noise pattern overlayed to the signal, not always very 
noticable. Sounds like a few random values are output every ~20ms
(or whatever).

Not sure how to debug this, do we have some "audio tap" feature to trace
the data sent to the hw?

Play music on sparc64 with mpg123 using autri:

autri0 at pci2 dev 8 function 0: Acer Labs M5451 AC-Link Controller Audio Device (rev. 0x02)
autri0: interrupting at ivec 7a4
autri0: ac97: Analog Devices AD1881A codec; headphone, Analog Devices Phat Stereo
audio0 at autri0: full duplex, playback, capture, mmap, independent

sysctl hw.autri0:
hw.autri0.frequency = 44100
hw.autri0.precision = 16
hw.autri0.channels = 2
hw.autri0.saturate = 1


Home | Main Index | Thread Index | Old Index