Tuesday, June 25, 2002 07:53 AM
Disclaimer: Shooting from the hip, closed book test, just guessing:
If you don't start with a file that really specifies a format in its header (have you tried "setFormat" and "setEncoding" first?), but rather if you start with an "empty object" ("new filename.wav") and try to "get" the format/encoding of the empty object, you're just going to get some defaults "inserted" somewhere along the way.
"ALAW" is crappy compressed old telephone quality audio, I think it's limited to 8 bit resolution (but also compressed), and 8KHz sample rate (thus the highest pitched sound it can pass is only 4KHz, like a telephone where you cannot tell the difference between an "f" and an "s" for instance).
"PCM SIGNED" is nice uncompressed linear 16-bit resolution, 44.1KHz (but takes a lot more bytes), e.g. standard CD-quality audio.
All you are determining is what comes through by default, given various kinds of "empty" input. Why don't you set up a real WAV file, with real (well, fixed-point or integer :-) audio content, and real format/encoding, and see what you get for it?