01659: stereo balancing is wrong

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
01659	Sound	Major	Always	Mar 31, 2008, 13:32	Apr 4, 2008, 14:19

Tester	Mamesick	View Status	Public	Platform	MAME (Official Binary)
Assigned To	aaron	Resolution	Fixed	OS	Windows XP/Vista 32-bit
Status [?]	Resolved			Driver
Version	0.124a	Fixed in Version	0.124u2	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	01659: stereo balancing is wrong
Description	Stereo balancing is wrong in all games that are configured to be stereo. Sound comes mainly from right channel, left channel is barely audible. Just try CPS2 or CAVE.C games for a confirmation. Regression is 0.123u3 when I guess speakers handling was partially rewritten to be an internal device.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.123u3
Affected Sets / Systems

Attached Files	0.124a_dsfdcta.png (42,501 bytes) Apr 1, 2008, 00:17
	0.124a.wav (1,936,532 bytes) Apr 1, 2008, 00:18
	sfa_0124u1.ogg (622,896 bytes) Apr 3, 2008, 16:00
	sfa_0124u1.png (36,348 bytes) Apr 3, 2008, 16:00

No.00488 Tafoid Administrator Mar 31, 2008, 21:35	I tried SFA and recorded waves of MAME 0.123 and 0.124. I looked at the levels with a sound editing program and I noticed 0.123 was pretty even in balance and when playing, the volume levels were essentially the same. 0.124 it appeared to me that the right side output was about 2 times louder that the left side judging from the volume levels. There is a difference, but was it accurate before - or now?
No.00489 Fujix Administrator Apr 1, 2008, 00:21	Just for reference, I tested dsfdcta and the left output is normal as 0.123. The right channel level is too high and causes terrible clipping noise.
No.00502 Kekule Tester Apr 2, 2008, 21:34 edited on: Apr 3, 2008, 21:27	Several games show unbalanced stereo output. Moreover, at a certain time, all the audio comes from the left channel only. Outrun and Turbo Outrun also show some unsettled framerate, till the left channel matter happens.
No.00507 aaron Developer Apr 3, 2008, 07:53	I'm not seeing this. Reports that state that "several games do this" are useless to me. Are there any non-CHD games that do this? Please re-verify with 0.124u1 and give me some specific games and examples. sfa does not appear to have any problems in 0.124u1.
No.00515 Fujix Administrator Apr 3, 2008, 16:15	sfa has the problem here in 0.124u1. The output level of the right channel is almost twice as the left. As far as I checked, all stereo games suffer from the same problem, I think it is fundamental and all stereo games probably have the problem.
No.00526 aaron Developer Apr 3, 2008, 18:19	Are you just running the attract mode? When I get home I'll post you my WAV which shows identical volumes on both sides. I wonder if this is a compiler issue.
No.00530 Tafoid Administrator Apr 3, 2008, 19:01	My original testing was running from command line with a -STR 30 and recording that input to a .WAV file. As Fujix confirmed, the same behavior is present in 0.124u1. Using default compilation tools here, MAMEDEV approved :)
No.00539 aaron Developer Apr 4, 2008, 05:26	Indeed. I can reproduce this only with gcc, not with MS Visual Studio. Both 32-bit and 64-bit work fine. Which means I have to debug it with the crappy debugger. Sigh.
No.00557 aaron Developer Apr 4, 2008, 14:19	Okay, figured it out.