Gamecube DSP format headers

All multibyte values are stored big-endian.
Offsets are in bytes for stereo files, nibbles for mono, and refer to the offset into the ADPCM stream (thus don't include the header). The file length (number of ADPCM nibbles) is the same way.

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Metroid Prime (standard devkit format)

0x00-0x03: number of samples
0x04-0x07: number of ADPCM nibbles (including frame headers)
0x08-0x0b: sample rate (Hz)
0x0c-0x0d: loop flag (1=looped, 0=not looped)
0x0e-0x0f: format (0 for ADPCM)
0x10-0x13: loop start offset
0x14-0x17: loop end offset
0x18-0x1b: ca (always zero)
0x1c-0x3b: decode coefficients
0x3c-0x3d: gain (zero)
0x3e-0x3f: initial predictor/scale
0x40-0x41: initial sample history 1
0x42-0x43: initial sample history 2
0x44-0x45: loop predictor/scale
0x46-0x47: loop sample history 1
0x48-0x49: loop sample history 2
0x4a-0x5f: padding
0x60-?: ADPCM stream

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Lego Star Wars (standard devkit format, stereo variant)

channel 1 header
0x00-0x03: number of samples
0x04-0x07: number of ADPCM bytes (including frame headers)
0x08-0x0b: sample rate (Hz)
0x0c-0x0d: loop flag (1=looped, 0=not looped)
0x0e-0x0f: format (0 for ADPCM)
0x10-0x13: loop start offset
0x14-0x17: loop end offset
0x18-0x1b: ca (always zero)
0x1c-0x3b: decode coefficients
0x3c-0x3d: gain (zero)
0x3e-0x3f: initial predictor/scale
0x40-0x41: initial sample history 1
0x42-0x43: initial sample history 2
0x44-0x45: loop predictor/scale
0x46-0x47: loop sample history 1
0x48-0x49: loop sample history 2
0x4a-0x5f: padding

channel 2 header
0x60-0x63: number of samples
0x64-0x67: number of ADPCM bytes (including frame headers)
0x68-0x6b: sample rate (Hz)
0x6c-0x6d: loop flag (1=looped, 0=not looped)
0x6e-0x6f: format (0 for ADPCM)
0x70-0x73: loop start offset
0x74-0x77: loop end offset
0x78-0x7b: ca (always zero)
0x7c-0x9b: decode coefficients
0x9c-0x9d: gain (zero)
0x9e-0x9f: initial predictor/scale
0xa0-0xa1: initial sample history 1
0xa2-0xa3: initial sample history 2
0xa4-0xa5: loop predictor/scale
0xa6-0xa7: loop sample history 1
0xa8-0xa9: loop sample history 2
0xaa-0xbf: padding

0xc0-?: ADPCM stream, 0x8000 byte stereo interleave

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Star Fox Assault/Donkey Konga (extra header)

0x00-0x03: "Cstr"
0x04-0x1f: unknown (padding?)

channel 1 header
0x20-0x23: number of samples
0x24-0x27: number of ADPCM bytes (including frame headers)
0x28-0x2b: sample rate (Hz)
0x2c-0x2d: loop flag (1=looped, 0=not looped)
0x2e-0x2f: format (zero for ADPCM)
0x30-0x33: loop start offset/2
0x34-0x37: loop end offset
0x38-0x3b: ca (always zero?)
0x3c-0x5b: decode coefficients
0x5c-0x5d: gain (zero)
0x5e-0x5f: initial predictor/scale
0x60-0x61: initial sample history 1
0x62-0x63: initial sample history 2
0x64-0x65: loop predictor/scale
0x66-0x67: loop sample history 1
0x68-0x69: loop sample history 2
0x6a-0x7f: padding

channel 2 header
0x80-0x83: number of samples
0x84-0x87: number of ADPCM bytes (including frame headers)
0x88-0x8b: sample rate (Hz)
0x8c-0x8d: loop flag (1=looped, 0=not looped)
0x8e-0x8f: format (zero for ADPCM)
0x90-0x93: loop start offset/2
0x94-0x97: loop end offset
0x98-0x9b: ca (always zero?)
0x9c-0xbb: decode coefficients
0xbc-0xbd: gain (zero)
0xbe-0xbf: initial predictor/scale
0xc0-0xc1: initial sample history 1
0xc2-0xc3: initial sample history 2
0xc4-0xc5: loop predictor/scale
0xc6-0xc7: loop sample history 1
0xc8-0xc9: loop sample history 2
0xca-0xdf: padding

0xe0-? ADPCM stream, 0x800 byte stereo interleave

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Metroid Prime 2 (compact dual decode coefficients)

0x00-0x03: "RS",0,3
0x04-0x07: unknown (2)
0x08-0x0b: number of samples
0x0c-0x0f: sample rate
0x10-0x13: number of ADPCM bytes (including frame headers)/2
0x14-0x15: loop flag (1=looped, 0=not looped)
0x16-0x17: format?
0x18-0x1b: loop start offset/2 (maybe, this still doesn't work perfectly)
0x1c-0x1f: loop end offset/2 (maybe, this still doesn't work perfectly)
0x20-0x3f: channel 1 decode coefficients
0x40-0x5f: channel 2 decode coefficients
0x60-?: ADPCM stream, 0x8f00 byte stereo interleave

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Nov. 10 2005 by hcs