Click/buzzing on un-pausing with WASAPI (EX) audio

[mark_k]

I noticed a small audio problem which seems happen on (un)pausing emulation. Testing on Windows 10 1709 with audio via AMD graphics card DisplayPort. Using A500-like cycle-exact config, Corruption (Magnetic Scrolls) ADF. It seems to happen only with WASAPI (EX) sound.

If "Automatic switching" is enabled, there is a click every time you un-pause. Sometimes on un-pausing there is a constant buzzing, as if the same buffer content is output over and over. Larger buffer size settings give a lower-pitch buzzing. Once the buzzing starts, it remains as you repeatedly un-pause.

When "Automatic switching" is not enabled, there is a click sound each time you un-pause by pressing the Pause key, but no buzzing as far as I could tell.

If you change to WASAPI shared, un-pausing a few times after that gives a click, but the clicks stop after a few times.

[Toni Wilen]

I couldn't duplicate it but does today's winuae.7z change anything?

[mark_k]

No change.

It's strange. I can reproduce every time on booting the Corruption ADF. But I saved state after the game had loaded, on loading state no clicks or buzzing. Config:

http://www.media!fire.com/file/s76yvma1nu7rcmb/A500_1.2_test_generic_NTSC.uae.7z

Boot Corruption ADF, double-click game icon from WB. Once loading/title screen and music starts, press any key to continue loading. After the game text appears keep tapping Pause.

[The clicking is quite quiet so turn your speaker/monitor volume up.]

[Toni Wilen]

That worked. Should be fixed now.

[mark_k]

Testing winuae.exe dated 2018-05-15 15:49 the buzzing seems to be fixed.

I still get clicks on tapping Pause repeatedly. After tapping Pause for a while the clicking stops. Probably, when there would have been buzzing before there is now silence.

Here's another clue: tap Pause until clicking stops. If you change audio filter or interpolation settings, the click-on-(un)pause returns. Keep tapping Pause and the clicking eventually stops.

Edit: If Automatic switching is disabled, the clicking never stops.

Edit 2: With WASAPI exclusive, there is a click on every press of Pause, i.e. when pausing and un-pausing. With WASAPI shared the click happens only when un-pausing.

[Toni Wilen]

It probably is normal. WASAPI ex clicks for some reason each time audio device is paused/resumed. Probably something to do with exclusive mode "disconnecting"/"connecting" internal Windows mixer.