Some FLAC decoder cleanups

[Torbjörn Andersson]

Ryan C. Gordon wrote:

 > Cool; it's in CVS. Err...is it an error if a FLAC stream doesn't have
 > any metadata, or are there certain types of metadata that are required
 > in a valid FLAC stream?

According to http://flac.sourceforge.net/format.html (which I didn't 
read until just now :-) the STREAMINFO metadata block is mandatory in a 
FLAC file. The other kinds are not. STREAMINFO is the one I check for.

Further reading of that document reveals that it ought to be possible 
for a decoder to start decoding at any given frame since each of them 
should have rate / sample size / channels encoded in its header. Hmm... 
I wonder if SDL_sound should be able to handle that. There won't be much 
to identify the data as FLAC then, so it would be only in the case where 
the caller specifies the type of data...

I certainly hope this doesn't mean there are FLAC streams where the 
sample format changes halfway through...

Torbjörn