ndsaudio sample specification

C Prototype:
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typedef struct _audioSample {
	u32 point;
	u32 length;
	u8 format;
	u8 repeat;
	u16 dfreq;
	const void *pdata;
} audioSample;
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point
	Sample loop point. Specified in 32-bit "word" units
	Loop starts at x*4 for 8bit samples, x*2 for 16bit samples, and x*8 for adpcm samples
length
	Sample length or loop length, specified in words
	Length of sample loop (or entire sample for one-shot) will be
	x*4 samples for 8bit, x*2 samples for 16bit, or x*8 samples for adpcm
format
	0 = 8BIT PCM
	1 = 16BIT PCM
	2 = IMA-ADPCM (4BIT)
repeat
	1 = loop infinite
	2 = one-shot
	"point" must be set to zero when using one-shot
dfreq
	default sampling rate in "hz/32" units, 1024=32khz
pdata
	pointer to sample data
	if "pdata" is zero then the sample data will be expected to follow 
	directly after the struct
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Notes on MODE1 audio mode:
	MODE1 interpolation routines cannot handle sample input "-max", 
	when using MODE1 clamp sample range to [-127,127] (8bit) or [-32767,32767] (16bit)
	
	MODE1 also expects 1 (or 2?) extra samples past the end of the sample
	the extra samples should be 0 for one shot samples, or copies of the
	samples at the loop starting point.
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Other notes:
	IMA-ADPCM format is not supported on MODE1,MODE2.
	MODE2 discards the LSB of 16-bit samples (8bit mixer input only)