all audio codecs (cook,atrk,14_4,28_8,dnet,sipr) have the same interface,
but i have only analyzed the cook codec


audio properties

00 short text/description of the format (bitrate, when to use)
01 avg. bytes/sec output
02 ulong: ?
   ulong: samples per second
   ushort: bits/sample
   ushort: number of channels
03 constant 2
04 long description
05 constant 1 (always?)
06 ulong: block align (input frame for RADecode)
07 string: minimum player version
08 n/a
09 n/a
0A n/a
0B n/a
0C n/a
0D ?
0E ?
0F ?
10 ?
11 ?
12 ?
13 min. output buffer size? max. number of samples?
14 ?




functions:

ulong result=RAOpenCodec2(ra_main_t *raMain);

ulong result=RAInitDecoder(ra_main_t *raMain, p2);
p2=?


void *GetRAFlavorProperty(ra_main_t *raMain, ulong flavor, ulong property,
	short *property_length_in_bytes);
returns property data for a specific data

ulong RADecode(ra_main_t *raMain, char *input_buffer,
	ulong input_buffer_size, char *output_buffer,
	ulong *decoded_bytes, ulong p6=-1);

RAFreeDecoder(ra_main_t *);

RACloseCodec(ra_main_t *);


ulong RASetFlavor(ra_main_t *ra_main, ulong flavor);
a flavor is an entry in the list of available format variations like
bitrate, number of channels, decoding algorithm, and so on