[Bug 20484] New: Audio distortion using Jack
wine-bugs at winehq.org
wine-bugs at winehq.org
Tue Oct 27 04:50:56 CDT 2009
http://bugs.winehq.org/show_bug.cgi?id=20484
Summary: Audio distortion using Jack
Product: Wine
Version: 1.0.0
Platform: PC
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gdi32
AssignedTo: wine-bugs at winehq.org
ReportedBy: p.drezet at inx-systems.com
When using Jack as the audio back end for wine low level but significant
distortion is heard and measurable on the output.
The level of distortion is sufficient to make wine jack unuseable for medium
quality audio applications (i.e. quality is rediced to equivelant of 32kbs -
mp3). This occurs on all signal levels and does not appear to be clipping.
This can be reproduced and identified most easily by recording the Jack output
with Audacity (also tested with other jack recording applications) and
comparing the spectrum of the original and recorded signals.
The spectrum indicates that the full bandwidth is present, but additional
frequency content has appeared. This also occurs when dithering is enabled in
jack.
Sounds like re-sampling aliasing issue - or perhaps an internal filter variable
scaling problem.
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