WaveData::Read unspecified streams; unsupport 8 and 32 bit formats

[kkm000]

This continues and supersedes #338 by @Minhua722.

Still missing tests, will add some over the weekend.

[danpovey]

Thanks.
Please make this PR against the kaldi_52 branch; it will help test it more before making it official.

[kkm000]

@danpovey, do you want to cherry-pick the commits after they are merged into master into a separate branch and a PR? The structure of the branch kaldi_52 is quite complex and non-obvious, and it is divergent in respect to master.

[kkm000]

@danpovey Or do you mean just rebase my changes onto kaldi_52 and make the PR against kaldi_52 only?

[kkm000]

Ah, and FWIW, #1547 is yet unmerged, so accepting this PR into master first will bring it into that open PR as well.

Oops, it goes the other way round. I think I understand now what you want me to do with my PR.

[kkm000]

Rebased to kaldi_52

[danpovey]

Thanks! So this is ready to merge?

[kkm000]

Yes, please. Tests only cover basic positive cases (expected wave data format, no malformed files etc.), but at the very least I verified that the new functionality worked.

[danpovey]

I have reverted this PR from the command line since the 'revert' button from github didn't work.