FLAC decoder (and a playsound.c bug)

[Torbjörn Andersson]

With a big, scary deadline looming at work, I haven't had the time or 
the energy to do much with SDL_sound. I hope this will change now that 
the deadline is gone (but not forgotten).

Lately, I've been trying to teach SDL_sound to handle FLAC. The 
documentation is a bit scant, but the day before yesterday I finally got 
approximately the sound I wanted from it, instead of hissing and SDL 
parachutes.

But only approximately. I was getting an annoying ticking sound 
throughout the whole playback, which I think I've finally tracked down 
to a bug in playsound.c. (Perhaps we ought to leave the playsound bug a 
bit longer because I managed to simplify flac.c a bit while searching 
there for the bug. ;-)

Unfortunately, I suck at autoconf (someone has to, I guess), so I was 
never able to automagically link libFLAC into SDL_sound, let alone check 
for the existence of libFLAC. Other than that, integrating it into 
SDL_sound ought to be straightforward.

Torbjörn Andersson
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