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https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alexandros Mandravillis
d17676a5c7
The runtime mounts a .chd natively and the launcher lists it in the disc picker, so a player could select one and see a valid disc identity, then have first-run setup fail: verify-disc, prepare_disc.py and probe_disc.py hash and parse raw 2352-byte track data, which a CHD stores compressed. Nothing on the Python side could read it, and telling players to install MAME for chdman is not an answer. libchdr is already vendored and compiled for the runtime and the native media CLI. Build it once more as a shared library in recompiler/ (CMake target chdr, output next to the emitters, static CRT on Windows so a plain python.exe can load it) and read the CHD from Python through ctypes. tools/psx_chd.py mirrors the layout the runtime's iso_reader.cpp uses -- 2448-byte frames, 4-frame track padding, stored versus virtual pregaps, big-endian audio -- and reproduces the .bin files a Redump dump of the same disc contains, in either of Redump's two layouts (one bin per track, or one bin for the disc). verify-disc hashes those reconstructed track bytes against [prepare_disc] instead of the container. prepare_disc.py writes the tracks into out_dir in whichever layout the recorded digests match and then continues down its normal cue path, so the data track is written once, SBI companions are looked up next to the CHD, and the receipt names the CHD the player chose. probe_disc.py extracts to a scratch directory and probes the cue. The CLI builds target chdr on demand for a kit whose emitters predate it, and falls back to the extract-it-first message when it cannot. Verified against two discs from a Redump library converted with chdman: a single-track MODE2 disc and a four-track disc with stored audio pregaps both reproduce their catalogued track-1 size, MD5 and SHA-1 exactly; verify-disc and prepare_disc.py accept the four-track one end to end. Tests build a synthetic uncompressed v5 CHD around a cooked ISO image, so no retail data is needed; the decode tests skip with a reason when no libchdr is built.