[Bug 27956] Dragon Naturally Speaking: Sound no longer works; sample rates and size is no longer supported

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=27956

--- Comment #20 from Andrew Eikum <aeikum at codeweavers.com> 2011-09-21 09:44:53 CDT ---
Well regardless, I did a little more looking into this. What's happening is
winecfg's audio file is in mono ADPCM format. ADPCM has to get converted into
PCM before being sent to MMDevAPI. We have the ability to do this through
msacm32 and imaadp32.acm.

However, imaadp32.acm only supports converting between equal numbers of
channels (stereo ADPCM to stereo PCM, or mono ADPCM to mono PCM). Your audio
hardware claims not to support mono audio. So we are asking imaadp32.acm to
convert from mono ADPCM to stereo PCM, which it cannot do. Windows's ADPCM
driver doesn't support this either.

So there's a couple routes to fix this.

We have other msacm32 conversions for stereo <=> mono PCM. So we could chain
several conversions together in WinMM to create mono ADPCM => mono PCM =>
stereo PCM. This might take some thought to avoid infinite chains. This has the
advantage of working with any driver backend. But it might not be what Windows
does.

Another possibility is to write simple conversion routines in winealsa.drv so
that every device supports both stereo and mono sound, either through ALSA or
through this crude mixer. This has less opportunity for things to go wrong.

I'll work on investigating how Windows handles this type of situation.

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