adpcm.txt

wave format document

Wave file format

Header
4Byte RIFF
4Byte Trunk Size  = File Length - 8
4Byte WAVE
(12B	12B)

First Chunk : format
4Byte fmt<sp>  
4Byte Chunk Size = 0x14 0x00 0x00 0x00
2Byte Audio format = 0x11 0x00 ADPCM format
2Byte Channel Num = 0x01 0x00  1 channel = 0x02 0x00 2Channel
4Byte Sample rate = 0x40 0x1f 0x00 0x00 8000Hz = 0x22 0x56 0x00 0x00 22050Hz
4Byte Byte rate (bytes per second) = 0xd7 0x0f 0x00 0x00
(20B	32B)

2Byte Block align = 0x00 0x01 256 bytes
2Byte Bit rate(bit per sample) = 0x04 0x00  4bit
(4B	36B)

optional:
2Byte extra param len 0x02 0x00  2 bytes
1Byte 0xf9
1Byte 0x01


data trunk
4byte data
4byte chunk size (N)
Nbyte

fact chunk
4byte fact
4byte length
data - 21 BA 06 00

List chunk
4byte LIST
4byte chunk size
data