Is anybody working on support for playing ADPCM wave files under Wine?
Not that I know of.
If not, I'd like to take a crack at it.
By all means.
I have an app that I use (Delorme's AAA MapNGo 4.0) that uses ADPCM wave files to contain spoken information on attractions. I know that Wine can access my sound system to play normal PCM wave files, as MN4 also has speech synthesis that does work. However, any attempt to play a ADPCM file results in the program pausing for a length of time, then continuing. I infer that this is because the lower levels of Wine don't know how to handle ADPCM.
That most likely correct.
ADPCM isn't rocket science - several programs, including sox, understand the protocol.
OK.
So, is anybody working on this (outside of TG and Lindows)? Any (non-null) pointers to useful information on how Wine has put together the sound subsystem? I'm not a Windows programmer, I'm an embedded systems and DSP person, but if I can find a block of code to hook into I can make this happen.
I suggest you talk to Eric Pouech eric.pouech@wanadoo.fr. He was active on the patch list yesterday so I suppose he will see this and reply.
In the mean time I can tell you that the PCM support is in wine/dlls/mcacm and ADPCM support should be there as well.
There is a file pcmconverter.c that implements PCM support so I suppose that there should be a adpcmconverter.c file to plug in the ADPCM support. There will probably need to be a few changes in other files as well.
Anyway Eric understands this better than I do. Let's wait and see what he has to say.