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Audio CD playback issue（FF/FR）
Posted: Sun Apr 24, 2022 7:47 pm
by dengsirtc
I found it impossible to fast-forward or rewind when playing Audio CD，is there anyone like me？
[BIOS] Super CD-ROM System (Japan) (v3.0).pce
TurboGrafx16_20220326.rbf
Re: Audio CD playback issue（FF/FR）
Posted: Sun Apr 24, 2022 8:54 pm
by dshadoff
The audio CD portion is based heavily on the use of subcodes (as is the CD-G), and isn't full-featured at this time.
Having said that, I've tested on the audio CD player, and found that my fast-forward button causes the position to go backward, and the rewind button causes the position to go backward at a higher rate.
Re: Audio CD playback issue（FF/FR）
Posted: Sun Apr 24, 2022 9:02 pm
by dshadoff
OK, I think this is a bug in the MSF/LBA translation, making the console think that it's 150 sectors earlier than it really is:
- the fast-forward should push it 75 sectors ahead, but really puts it 75 sectors behind
- the rewind should push it 75 sectors behind, but ends up being 225 sectors behind because of the -150 offset
I'll look into this a bit more.
Re: Audio CD playback issue（FF/FR）
Posted: Sun Apr 24, 2022 11:19 pm
by dshadoff
Pull request submitted