CD32 resume from save state: CD audio delay?

Al82 · 25 May 2019, 18:26

Currently using WinUAE 4.2.1 and I noticed that when using a CD32 config and resuming from a save state there's a brief delay until the CD audio resumes playback (yet the game carries on playing).

If I'm using AVI capture then this results in a sudden gap in the music, which I'm trying to avoid.

I'm guessing this might be because the audio is coming from an external wav file associated with the disc image, rather than being audio data inside the virtual machine's sound buffer, but I wondered if there was any way to work around this?

Toni Wilen · 25 May 2019, 20:18

It is optionally mixed with Paula audio (Sound panel Include CD and FMV audio ticked) but reason for delay was too simple: state restore started CD audio play like it was normal start of playback = hardware delays emulated.

winuae.7z should fix it.

Al82 · 25 May 2019, 20:28

Thanks, Toni - is the hyperlink missing from winuae.7z in your post?

Toni Wilen · 25 May 2019, 20:29

No. You need to search

Al82 · 25 May 2019, 20:37

Found it! Just tried it out and it works!

Thanks again Toni, much appreciated!!

Al82 · 26 May 2019, 04:39

I did some more experimenting and although the playback appears to be instant when resuming from a save state, the output is dropping about 1 frame's worth of audio.

It's very subtle, but if you listen closely you can hear a slight hiccup in the music.

Rep Steps:
1) Record avi clip 1
2) Hit F12 - create save state
3) Load save state
4) Record avi clip 2
5) Join clips together in editor

I've added an image of the audio wave form for reference.

Toni Wilen · 26 May 2019, 18:28

This is more tricky problem because sound init happens after statefile load. I'll try to fix it later..

Al82 · 27 May 2019, 12:28

Thanks, Toni - really appreciate you taking the time to look at this!

Toni Wilen · 16 July 2019, 20:50

Possibly fixed now.

Al82 · 20 July 2019, 14:01

Thanks, Toni - I'll check out the latest build!

Al82 · 21 July 2019, 23:02

Unfortunately, it appears to be the same - just tested using the 16.07.2019 build and there's still a gap in the CD audio clips when resuming from a state.

Strange thing is, I did some CD32 videos some time ago using a much older build and I don't recall having the problem then, at least not when I reviewed the footage. Going to experiment...

* Edit *
Looks like it was there before, just that it depends on the nature of the sound being played; sometimes you don't notice it.

Toni Wilen · 17 August 2019, 21:45

Another fix attempt done..

Al82 · 28 August 2019, 16:51

Hi Toni - It looks like it might just have worked; no gap at the beginning of the CD audio when restoring from state!

I'll do so more test and get back to you.

Al82 · 29 August 2019, 17:10

Did some testing and although the CD music starts instantly from resume state (no gap in the audio), the synchronisation in terms of actual position from where one clip ends and another begins when resuming from state isn't quite right - it's extremely close, but you can hear a couple of frames of the audio repeat itself when joining video segments together.

It sounds (to my ears) like the music has been rewound ever so briefly.

Toni Wilen · 31 August 2019, 20:17

I am not sure if perfect sync is possible. CDA runs in separate thread and is not synced with main emulation.

25 May 2019, 18:26	#1
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	CD32 resume from save state: CD audio delay? Currently using WinUAE 4.2.1 and I noticed that when using a CD32 config and resuming from a save state there's a brief delay until the CD audio resumes playback (yet the game carries on playing). If I'm using AVI capture then this results in a sudden gap in the music, which I'm trying to avoid. I'm guessing this might be because the audio is coming from an external wav file associated with the disc image, rather than being audio data inside the virtual machine's sound buffer, but I wondered if there was any way to work around this?

26 May 2019, 04:39	#6
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	I did some more experimenting and although the playback appears to be instant when resuming from a save state, the output is dropping about 1 frame's worth of audio. It's very subtle, but if you listen closely you can hear a slight hiccup in the music. Rep Steps: 1) Record avi clip 1 2) Hit F12 - create save state 3) Load save state 4) Record avi clip 2 5) Join clips together in editor I've added an image of the audio wave form for reference. Last edited by Al82; 26 May 2019 at 04:46.

21 July 2019, 23:02	#11
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Unfortunately, it appears to be the same - just tested using the 16.07.2019 build and there's still a gap in the CD audio clips when resuming from a state. Strange thing is, I did some CD32 videos some time ago using a much older build and I don't recall having the problem then, at least not when I reviewed the footage. Going to experiment... * Edit * Looks like it was there before, just that it depends on the nature of the sound being played; sometimes you don't notice it. Last edited by Al82; 21 July 2019 at 23:56.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
save game and save state problems	markyboy147	support.FS-UAE	12	05 October 2022 20:31
WinUAE "save state" to include the current state of floppies.	seuden	request.UAE Wishlist	2	03 February 2012 09:36
Save state	hrafnkellg	New to Emulation or Amiga scene	5	06 May 2009 18:05
CD32 - save state problem!	RickyC	support.WinUAE	8	13 August 2007 03:55
Save-State and Load State don't work	Klownk	support.WinUAE	15	27 December 2002 14:24

25 May 2019, 20:18	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	It is optionally mixed with Paula audio (Sound panel Include CD and FMV audio ticked) but reason for delay was too simple: state restore started CD audio play like it was normal start of playback = hardware delays emulated. winuae.7z should fix it.

25 May 2019, 20:28	#3
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Thanks, Toni - is the hyperlink missing from winuae.7z in your post?

25 May 2019, 20:29	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	No. You need to search

25 May 2019, 20:37	#5
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Found it! Just tried it out and it works! Thanks again Toni, much appreciated!!

26 May 2019, 18:28	#7
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	This is more tricky problem because sound init happens after statefile load. I'll try to fix it later..

27 May 2019, 12:28	#8
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Thanks, Toni - really appreciate you taking the time to look at this!

16 July 2019, 20:50	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Possibly fixed now.

20 July 2019, 14:01	#10
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Thanks, Toni - I'll check out the latest build!

17 August 2019, 21:45	#12
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Another fix attempt done..

28 August 2019, 16:51	#13
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Hi Toni - It looks like it might just have worked; no gap at the beginning of the CD audio when restoring from state! I'll do so more test and get back to you.

29 August 2019, 17:10	#14
Al82 Registered User Join Date: Sep 2017 Location: UK Posts: 95	Did some testing and although the CD music starts instantly from resume state (no gap in the audio), the synchronisation in terms of actual position from where one clip ends and another begins when resuming from state isn't quite right - it's extremely close, but you can hear a couple of frames of the audio repeat itself when joining video segments together. It sounds (to my ears) like the music has been rewound ever so briefly.

31 August 2019, 20:17	#15
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	I am not sure if perfect sync is possible. CDA runs in separate thread and is not synced with main emulation.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)