SND_PCM_FORMAT_S24_LE and similar are for 24bit ints packed in 4-bytes each.
There is a similar family of formats for 3-bytes packed data (as stored in 24bit wave files).
This commit:
- adds S24_3LE, S24_3BE, U24_3LE, U24_3BE PCM formats to the alsaaudio.c
- updates documentation
- updates playwav.py to correctly play typical 24Bit PCM wave files
Closes#38
Added isine as an example for interactive generation of sound.
git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@33 ec2f30ec-7544-0410-870e-f70ca00c83f0