This article is about Gotcha Force CHD file format and ongoing researches on it.
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This file format needs a lot of research. Researches on headers / bodies structures has to be done. |
GCD of CHD lengths = 16
CHD files contain several blocks:
0x0 "Head" Header CHD
- 0x4 - 4 bytes uint - Prog block header offset.
- 0x8 - 4 bytes - Quantity?
- 0xC - 4 bytes uint - Total file length.
- 0x10 - 4 bytes - Unknown
- 0x14 - 4 bytes - Unknown
- 0x18 - 4 bytes uint - Smpl block header offset.
- 0x1C - 4 bytes uint - DSPi block header offset.
0x20 "Prog" It could describe audio datas or script.
- 0x24 - 4 bytes uint - data block length.
- 0x28 - 4 bytes - Quantity?
- 0x2C - 4 bytes - -1?
0x0 "Smpl" Samples?
- 0x4 - 4 bytes uint - data block length.
- 0x8 - 4 bytes - Samples count? (In hexadecimal - Ex 0x68 = 104 + 1(0,1,2....104))
- 0xC - 4 bytes - -1?
0x0 "Dspi" DSP for DSPADPCM, idea for further investigations: List of DSP in DPK (Gotcha Force).
- 0x4 - 4 bytes uint - data block length.
- 0x8 - 4 bytes - DSP count? (In hexadecimal)
- 0xC - 4 bytes - -1?