Is there a way that one could extract the raw IMA ADPCM streams from .ivaud (Grand Theft Auto IV) files, maybe using such info above? I ask because a friend of mine...
well, it'd be rather nice to have ADPCM rather than the much larger PCM transcodes thru vgmstream
The problem with ADPCM is that it does not specify the initial decoder values, how to deal with stereo data or how to package the data.
So there is not just "one" ADPCM format, but loads of them. As such, what you are asking for is not specified enough. You need to tell us what container format you want data in.