CHD support

[BabaJeanmel]

Retroarch now supports CHD (compressed images) files for a variety of platforms including PC-Engine CD, Sega CD, Playstation and Saturn. Metropolis Launcher can't currently "see" them when scanning a folder for roms. Would it be possible to add support for these files ?

[theMK2k]

Support as in "chd files can be added" is trivial.

What isn't trivial is the actual game detection for CHDs:

With CD images Metropolis Launcher uses different techniques in order to identify the actual game in order to provide meta data. For example:

• Playstation games are identified by extracting the SYSTEM.CNF file from the ISO, within the SYSTEM.CNF we can read the identifying string, e.g. "SLES00032"
• Sega Mega CD games have identifiers at Hex position 0x0190 ... 0x019F in the ISO file

These techniques are currently not applicable with CHDs as I don't have a tool or .Net library at hand to perform the tasks of either

• extracting a defined file from the file contents of the media or
• reading a defined section of the original ISO

[Rendarius]

Anyway I could help you with this process perhaps??... Maybe by manually collecting the CHD numbers or Identifiers... and compiling a list of them?..

[theMK2k]

Hi @Rendarius,

thanks for your offer. If you know how to get any identifier from a CHD, please let me know. As this would be the first step towards a solution.

[Rendarius]

Ive been doing some major searching and I MAY have found something of relevance for your needs.... perhaps... Take a peek at this link and let me know if that works for you... If not, - no worries, Im on the track of 1-2 possible other options...(...that I think might pay off for my efforts...)... Here is the link http://www.mameaddicts.com/phpBB3/viewtopic.php?t=605

…

On Tue, Apr 3, 2018 at 3:12 AM, MK2k ***@***.***> wrote: Hi @Rendarius <https://github.com/Rendarius>, thanks for your offer. If you know *how* to get any identifier from a CHD, please let me know. As this would be the first step towards a solution. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AkQzI4H-a9I3p1L_MTA9LEVzdxGSio2Tks5tkyDGgaJpZM4P-td1> .

[theMK2k]

Relying on the file name of the actual CHD is not a good/reliable way :(

[theMK2k]

https://github.com/claunia/DiscImageChef seems to be a fine solution here