CHD (Gotcha Force): Difference between revisions

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Latest revision as of 13:32, 7 October 2023

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This article is about Gotcha Force CHD file format and ongoing researches on it.

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?

@@ Line 1: / Line 1: @@
 [[Gotcha Force | &larr; Gotcha Force]]
-''Cet article est pour les format de fichiers CHD de Gotcha Force. Voir [[CHD (Format de fichier)]] pour les autres versions de ce fichier.''
+''This article is about Gotcha Force CHD file format and ongoing researches on it.''
-<br>
+{{Research | 3| Researches on headers / bodies structures has to be done. }}
-<div style="overflow-x:auto;">
-{| style="padding:0px; margin:0px; width:100%; background-color: transparent; white-space:nowrap;" cellspacing="3"
-| colspan="2" |
-{| style="padding:0px; background-color: transparent;" width="100%"
-| style="width:18%; text-align:center; white-space:nowrap;" |
-<div style="font-size:195%; color: red;">Cette section a besoin de beaucoup de recherche.</div>
-<div style="font-size: 125%; color: red;">Des recherches sur comment fonctionne le header et comment interagit le fichier sont nécessaire. </div>
-|}
-|}
-</div>
-<br>
-Les fichiers CHD contiennent différentes sections :
+GCD of CHD lengths = 16
-*"Head" <span style="color: red;"> Pourrait faire référence au header ou alors au headtracking présent sur le jeu (Les borgs ciblés sont suivis par la tête du borg du joureur)</span>
+CHD files contain several blocks:
-*"Prog" <span style="color: red;"> Pourrait faire référence à du script.</span>
+'''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"''' <span style="color: rgb(241, 196, 15);"> It could describe audio datas or script.</span>
+* 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"''' <span style="color: rgb(241, 196, 15);">DSP for DSPADPCM, idea for further investigations: List of DSP in [[DPK (Gotcha Force)]].</span>
+* 0x4 - 4 bytes uint - data block length.
+* 0x8 - 4 bytes - DSP count? (In hexadecimal)
+* 0xC - 4 bytes - -1?
-*"Smpl"
+[[Category:File format]]
+[[Category:Gotcha Force]]
-*"Dspi"
-<span style="color: rgb(241, 196, 15);">Les fichiers CHD sont des fichiers compressé contenant des data de jeu.</span>[https://retropie.org.uk/docs/CHD-files/ CHD Docs Retropie]
-<span style=" color: rgb(241, 196, 15);">Propose un format de fichier compressé, il faudrait tester l'algorithme de décompression et de compression afin de savoir si ce format est le même.</span>
-__toc__
-[[Catégorie:Format de fichier]]
-[[Catégorie:Gotcha Force]]