6 bit RLE compressed PCM format

This format is RLE compressible 6 bit DPCM, it's encoded to single byte for ease to use.

Each output is expanded to 16 bit signed PCM.

Data format (single byte):

Byte format
Bit								Description
7	6	5	4	3	2	1	0
x	-	-	-	-	-	-	-	Delta bit
-	0	x	x	x	x	x	x	Sound output
-	0	x	-	-	-	-	-	Negative bit
-	0	-	x	x	x	x	x	Output bit
-	1	x	x	x	x	x	x	Repeat previous output update x - 1 time (RLE)

Delta bit
Bit	Description
0	Replace output
1	Add to previous output

Negative bit
Bit	Description
0	Positive
1	Negative

Output bit
Bit					Description
4	3	2	1	0
e	e	e	e	m	Output = (2 + m) << (e - 1)
0	0	0	x	x	Output = x

Decode routine

X = (X-1 * D) + (Y * 1 - (Neg * 2))
X = -32767 < X < 32767

X = Current output
X-1 = Previous output
D = Delta bit
Y = Next output
Neg = Negative bit