Audio CD playback issue(FF/FR)

dengsirtc
Posts: 7
Joined: Tue Mar 02, 2021 9:04 pm

Audio CD playback issue(FF/FR)

Unread post 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
dshadoff
Core Developer
Posts: 545
Joined: Sun May 24, 2020 9:30 pm
Has thanked: 19 times
Been thanked: 144 times

Re: Audio CD playback issue(FF/FR)

Unread post 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.
dshadoff
Core Developer
Posts: 545
Joined: Sun May 24, 2020 9:30 pm
Has thanked: 19 times
Been thanked: 144 times

Re: Audio CD playback issue(FF/FR)

Unread post 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.
dshadoff
Core Developer
Posts: 545
Joined: Sun May 24, 2020 9:30 pm
Has thanked: 19 times
Been thanked: 144 times

Re: Audio CD playback issue(FF/FR)

Unread post by dshadoff »

Pull request submitted
Post Reply