Distorted sound with ptreplay

neoman · 04 December 2012, 18:28

Hi there,

today I created a small development environment with vasm, vlink and vbcc on my windows machine. Also I added AgaOS to it (https://github.com/jsvennevid/agaos) which helps me a lot with initialization stuff and so on.

I came very far today, displayed my first copper list and wanted to integrate sound. Some time ago StingRay gave me a ptreplay.s which is fairly easy to integrate. I did that and indeed the sound starts (yes I do mt_music on every vertical blank or after WaitTOF) but it sounds highly distorted.

There is not much source to show except some de-/initialization stuff. Also I'm testing in WinUAE and everything else audio-related is working there.

I uploaded some sources + exe here: http://www.localmindprovider.com/help/

The intro.asm was compiled by vbcc btw, so have a look into intro.c.

I really don't know what's I'm doing wrong there

Thanks!

neoman/titan

StingRay · 04 December 2012, 19:09

Hi Neoman, it's been a while.

I suppose it happens with all modules you tried?

neoman · 04 December 2012, 19:14

StingRaaaay!

Yes, I tried it with sowhat-intro.mod, cebit90.mod and this one

I also tried to set DMA and IRQ stuff on my own but no change. It sounds distorted as if the data written into AUDxDAT gets clipped somehow.

StingRay · 04 December 2012, 19:17

It somehow sounds as if the samples aren't in chip ram but they are. Strange. Need to investigate. =)

neoman · 04 December 2012, 19:19

Yeah I also checked that but when they were in fast RAM I just heard nothing :P

StingRay · 04 December 2012, 20:17

I checked, your replayer code is broken! Apparently your compiler/assembler optimised it and broke something in the process (probably jump table stuff). Try to disable any optimisations for the replay routine and it should work then. Yet another reason why I always hated opimising Assemblers/Compilers on Amiga!

neoman · 04 December 2012, 23:06

StingRay my hero

I'll give it a try and also answer back here. Thanks in advance!!

neoman · 04 December 2012, 23:38

Yeah, you were right. It's working now. The optimizer killed some stuff.

After mt_ghighpp the ble.s mt_ples
Modified many pea destinations here and there
After mt_nextpos the blt.s mt_nonewpos
After mt_appregio the beq.s mt_arp1 and bra.s mt_arp3

So I investigated that further and noticed that I was not using the current vasm version because I had an old one somewhere in my %PATH%

With the current version it works now - even with optimizations. The newest vasm even got a module now to show the optimizations and which ones could be critical. There are none left now and it's working with vasm 1.5c. 1.3 wasn't working.

Thanks for finding that out, StingRay, I'm happy now

StingRay · 05 December 2012, 07:34

No problem. =) After checking your source and exe I couldn't find any reason why the music sounded so strange so I compared the replayers. First I ripped the replayer from your intro and tested it -> same strange sound without any extra code and also a different size compared to the original replayer binary -> replayer broken. Hooray for disassemblers.

neoman · 05 December 2012, 10:13

I feel I little bit ashamed now because I should have noticed it! I tested some mods now and all are working. Issue solved.

StingRay · 05 December 2012, 10:29

No reason to feel ashamed, that's not really an obvious bug specially when you just started with Amiga coding. Good thing is, it's solved now.

neoman · 05 December 2012, 12:34

Also, which disassembler do you use?

StingRay · 05 December 2012, 13:15

ReSource which is still the best for Amiga stuff. You can use IDA Pro on PC too but I prefer ReSource.

04 December 2012, 18:28	#1
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	Distorted sound with ptreplay Hi there, today I created a small development environment with vasm, vlink and vbcc on my windows machine. Also I added AgaOS to it (https://github.com/jsvennevid/agaos) which helps me a lot with initialization stuff and so on. I came very far today, displayed my first copper list and wanted to integrate sound. Some time ago StingRay gave me a ptreplay.s which is fairly easy to integrate. I did that and indeed the sound starts (yes I do mt_music on every vertical blank or after WaitTOF) but it sounds highly distorted. There is not much source to show except some de-/initialization stuff. Also I'm testing in WinUAE and everything else audio-related is working there. I uploaded some sources + exe here: http://www.localmindprovider.com/help/ The intro.asm was compiled by vbcc btw, so have a look into intro.c. I really don't know what's I'm doing wrong there Thanks! neoman/titan

04 December 2012, 23:38	#8
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	Yeah, you were right. It's working now. The optimizer killed some stuff. After mt_ghighpp the ble.s mt_ples Modified many pea destinations here and there After mt_nextpos the blt.s mt_nonewpos After mt_appregio the beq.s mt_arp1 and bra.s mt_arp3 So I investigated that further and noticed that I was not using the current vasm version because I had an old one somewhere in my %PATH% With the current version it works now - even with optimizations. The newest vasm even got a module now to show the optimizations and which ones could be critical. There are none left now and it's working with vasm 1.5c. 1.3 wasn't working. Thanks for finding that out, StingRay, I'm happy now

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04 December 2012, 19:09	#2
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Hi Neoman, it's been a while. I suppose it happens with all modules you tried?

04 December 2012, 19:14	#3
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	StingRaaaay! Yes, I tried it with sowhat-intro.mod, cebit90.mod and this one I also tried to set DMA and IRQ stuff on my own but no change. It sounds distorted as if the data written into AUDxDAT gets clipped somehow.

04 December 2012, 19:17	#4
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	It somehow sounds as if the samples aren't in chip ram but they are. Strange. Need to investigate. =)

04 December 2012, 19:19	#5
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	Yeah I also checked that but when they were in fast RAM I just heard nothing :P

04 December 2012, 20:17	#6
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	I checked, your replayer code is broken! Apparently your compiler/assembler optimised it and broke something in the process (probably jump table stuff). Try to disable any optimisations for the replay routine and it should work then. Yet another reason why I always hated opimising Assemblers/Compilers on Amiga!

04 December 2012, 23:06	#7
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	StingRay my hero I'll give it a try and also answer back here. Thanks in advance!!

05 December 2012, 07:34	#9
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	No problem. =) After checking your source and exe I couldn't find any reason why the music sounded so strange so I compared the replayers. First I ripped the replayer from your intro and tested it -> same strange sound without any extra code and also a different size compared to the original replayer binary -> replayer broken. Hooray for disassemblers.

05 December 2012, 10:13	#10
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	I feel I little bit ashamed now because I should have noticed it! I tested some mods now and all are working. Issue solved.

05 December 2012, 10:29	#11
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	No reason to feel ashamed, that's not really an obvious bug specially when you just started with Amiga coding. Good thing is, it's solved now.

05 December 2012, 12:34	#12
neoman titan sucks! Join Date: Dec 2012 Location: munich/germany Posts: 54	Also, which disassembler do you use?

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05 December 2012, 13:15	#13
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	ReSource which is still the best for Amiga stuff. You can use IDA Pro on PC too but I prefer ReSource.