[Bug 29294] No sound with ALSA loopback devices

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=29294

--- Comment #18 from Antonio López <amlopezalonso at gmail.com> 2012-02-29 18:14:30 CST ---
(In reply to comment #17)

> 
> The key difference is that in the former run, ALSA "default" was occupado,
> hence Wine used "plughw:0,1" as default, which produced no sound on your
> machine IIRC (perhaps it's the digital output?).  In your latest log, ALSA's
> "default" opens successfully, so Wine uses that as its own default.  As it
> happens, it plays sound well.
> 
> It would be good if you could find out what caused that difference.  It should
> be systematic, not random.

I'll try to work it out.

> It may not look like so, but now we've made a lot of progress.
> You now must try and split your apps in 3 categories:
>  1. old ones that use winmm for sound (or intros);
>  2. ones that use DSound;
>  3. modern ones running in w7 mode that use mmdevapi directly.
> Use WINEDEBUG=+loaddll to see what gets loaded.
> Category 3 should play well, because they typically use XAudio2 and the render
> test is believed to behave like XAudio2.  I believe winmm would work well on
> your machine too.  DSound->mmdevapi may have its own quirks.
> If only DSound is problematic, this issue may end up as a duplicate of bug
> #28781 or some other DSound stuttering bug, independent on Jack/loopback.
> 

For test purposes I chose Silent Hunter 4, set winecfg to Windows 7 and logged
the results (check new attachment). The sound was still stuttering and I was
unable to tell which dll was being effectively used as it seemed to me that all
three sound dlls (dsound, winmm and mmdevapi) were being loaded.


> 
> I encourage you to
> export WINETEST_INTERACTIVE=1
> cd dlls/winmm/tests; rm *.ok; make wave.ok mci.ok
> cd dlls/dsound/tests; rm *.ok; make test
> and hear how the sine tests perform.  Be aware that the 24/32 bit tests produce
> awful sounds instead of sines.  You may want to uncomment them.
> 

No sound from these tests as plughw:0,0 is being used. 

> What if you set the new winealsa.drv input and output registry keys to "asnoop"
> and "amix"? (you don't need the duplex device since there are 2 keys.)

It still stutters (set ALSAInputDevices and ALSAOutputDevices to asnoop and
amix respectively).

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