Hi I had try it in Foobar 2000 with WASAPI plugin use WASAPI exclusive Event
Mode to playback. Playback the dump wave. You can hear the noise. In WASAPI
exclusive PUSH mode, its seems no problem.
在 2018年7月3日 星期二 下午9:33:10 [GMT+8]， Matthew van
Eerde<dmarc-noreply@xxxxxxxxxxxxx> 寫道：
WASAPI exclusive mode is free to use either the host pin or the offload pin, at
Windows’ discretion.
What app are you using to play in WASAPI exclusive mode?
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Vincent Burel (VB-Audio) <vincent.burel@xxxxxxxxxxxx>
Sent: Saturday, June 30, 2018 3:18:34 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] SYSVAD WASAPI Eclusive playback mode does not work.
Hello,
While testing SYSVAD example…
When opening SYSVAD Speaker in WASAPI Exclusive mode
It uses OFFLOAD pin and changes the method to _WithNotification
Then the TimerNotifyRT function is called...
Q1: why it is using offload mode there (WASAPI input exclusive mode does not
use this)
The problem is that this mode is not working correct.
When we playback a sound in SYSVAD speaker, the generated file is not conform
(noise is added ).
Sounds is correct for 100 or 200 ms and then get disturbed by a noise and then
sounds correct again during hundreds ms and become noisy again.
Attached Picture show the noise incident on 100Hz sinus… we can see the time
drift and how the noise is added (small part of 16, 32, 48 samples, coming from
other part of the DMA buffer)
Q2: somebody knows something about this problem ?
Regards
Vincent Burel
