Can Sega CD add support for pre-gap format Cue(redump)?

[napdh]

I notice there is a 1~2sec delay from redump ISOs but it is normal if you use other format ISOs. It is because redump record pre-gap in files (for ultimately 1:1 copy). take final fight CD for example:

redump's cue

FILE "final fight cd (japan).bin" BINARY TRACK 01 MODE1/2352 INDEX 01 00:00:00 TRACK 02 AUDIO PREGAP 00:02:00 INDEX 01 02:39:69 TRACK 03 AUDIO PREGAP 00:01:74 INDEX 01 04:49:71 TRACK 04 AUDIO PREGAP 00:01:74 INDEX 01 07:04:65 TRACK 05 AUDIO PREGAP 00:01:74 INDEX 01 09:14:05 TRACK 06 AUDIO PREGAP 00:01:74 INDEX 01 11:21:47 TRACK 07 AUDIO PREGAP 00:01:74 INDEX 01 14:35:72 TRACK 08 AUDIO PREGAP 00:01:74 INDEX 01 16:41:53 TRACK 09 AUDIO PREGAP 00:01:74 INDEX 01 18:38:09 TRACK 10 AUDIO PREGAP 00:01:74 INDEX 01 20:50:74 TRACK 11 AUDIO PREGAP 00:01:74 INDEX 01 23:01:12 TRACK 12 AUDIO PREGAP 00:01:74 INDEX 01 25:10:53 TRACK 13 AUDIO PREGAP 00:01:74 INDEX 01 28:01:19 TRACK 14 AUDIO PREGAP 00:01:74 INDEX 01 28:08:73 TRACK 15 AUDIO PREGAP 00:01:74 INDEX 01 28:18:74 TRACK 16 AUDIO PREGAP 00:01:74 INDEX 01 28:31:57 TRACK 17 AUDIO PREGAP 00:01:74 INDEX 01 28:40:12 TRACK 18 AUDIO PREGAP 00:01:74 INDEX 01 30:40:62 TRACK 19 AUDIO PREGAP 00:01:74 INDEX 01 30:54:64 TRACK 20 AUDIO PREGAP 00:01:74 INDEX 01 31:05:64 TRACK 21 AUDIO PREGAP 00:01:74 INDEX 01 33:08:32 TRACK 22 AUDIO PREGAP 00:01:74 INDEX 01 33:22:08 TRACK 23 AUDIO PREGAP 00:01:74 INDEX 01 36:36:11 TRACK 24 AUDIO PREGAP 00:01:74 INDEX 01 38:47:20 TRACK 25 AUDIO PREGAP 00:01:74 INDEX 01 41:07:62 TRACK 26 AUDIO PREGAP 00:01:74 INDEX 01 41:30:36 TRACK 27 AUDIO PREGAP 00:01:74 INDEX 01 41:54:28 TRACK 28 AUDIO PREGAP 00:01:74 INDEX 01 42:18:09 TRACK 29 AUDIO PREGAP 00:01:74 INDEX 01 43:08:42

other ISO's

FILE "FINAL_FIGHT.BIN" BINARY TRACK 01 MODE1/2352 INDEX 01 00:00:00 TRACK 02 AUDIO PREGAP 00:02:00 INDEX 01 02:39:69 TRACK 03 AUDIO INDEX 00 04:49:71 INDEX 01 04:51:70 TRACK 04 AUDIO INDEX 00 07:06:64 INDEX 01 07:08:63 TRACK 05 AUDIO INDEX 00 09:18:03 INDEX 01 09:20:02 TRACK 06 AUDIO INDEX 00 11:27:44 INDEX 01 11:29:43 TRACK 07 AUDIO INDEX 00 14:43:68 INDEX 01 14:45:67 TRACK 08 AUDIO INDEX 00 16:51:48 INDEX 01 16:53:47 TRACK 09 AUDIO INDEX 00 18:50:03 INDEX 01 18:52:02 TRACK 10 AUDIO INDEX 00 21:04:67 INDEX 01 21:06:66 TRACK 11 AUDIO INDEX 00 23:17:04 INDEX 01 23:19:03 TRACK 12 AUDIO INDEX 00 25:28:44 INDEX 01 25:30:43 TRACK 13 AUDIO INDEX 00 28:21:09 INDEX 01 28:23:08 TRACK 14 AUDIO INDEX 00 28:30:62 INDEX 01 28:32:61 TRACK 15 AUDIO INDEX 00 28:42:62 INDEX 01 28:44:61 TRACK 16 AUDIO INDEX 00 28:57:44 INDEX 01 28:59:43 TRACK 17 AUDIO INDEX 00 29:07:73 INDEX 01 29:09:72 TRACK 18 AUDIO INDEX 00 31:10:47 INDEX 01 31:12:46 TRACK 19 AUDIO INDEX 00 31:26:48 INDEX 01 31:28:47 TRACK 20 AUDIO INDEX 00 31:39:47 INDEX 01 31:41:46 TRACK 21 AUDIO INDEX 00 33:44:14 INDEX 01 33:46:13 TRACK 22 AUDIO INDEX 00 33:59:64 INDEX 01 34:01:63 TRACK 23 AUDIO INDEX 00 37:15:66 INDEX 01 37:17:65 TRACK 24 AUDIO INDEX 00 39:28:74 INDEX 01 39:30:73 TRACK 25 AUDIO INDEX 00 41:51:40 INDEX 01 41:53:39 TRACK 26 AUDIO INDEX 00 42:16:13 INDEX 01 42:18:12 TRACK 27 AUDIO INDEX 00 42:42:04 INDEX 01 42:44:03 TRACK 28 AUDIO INDEX 00 43:07:59 INDEX 01 43:09:58 TRACK 29 AUDIO INDEX 00 44:00:16 INDEX 01 44:02:15

[birdybro]

Simplified comparison side by side to show what is being described.

[ekeeke]

PREGAP command is already supported and actually indicates a pause that is NOT included in the image file and must be added by emulator when replicating the TOC, as opposed to "INDEX 00" command which indicates a section before the track start (usually pause for Mega CD games) that is included in the image file.

I just looked at Redump CUE files and they do not seem to use PREGAP commands (they use "INDEX 00" commands instead) so it seems like you are using an invalid CUE file.

[napdh]

sorry. I found I use old chd isos from MESS and took it as newest redump's ISOs.