Sound Plugin Development

[RPGMaster]

Hello, I'm trying to develop a sound plugin and would like some advice . So far I've looked at Zilmar's Basic Audio and 1964 Audio. I've tried changing things around to see what happens. I'm understanding more and more of it.

One thing I need help with is buffers. I tried adding more buffers, but the sound was kinda weird. I probably messed up with the algorithm somewhere. Strange thing is, adding an extra buffer to Zilmar's audio, made SSB64's intro more in sync, but that didn't work for 1964 Audio.

I also tried seeing how to reduce crackling. 1964 Audio's sync audio does the job well, but at the price of fps. Lowering the sleep time from 10ms to 8 sorta helped, but it's not a perfect solution. I thought about implementing SSE for the ucode stuff. Problem is, the main part I need to optimize has too many if statements ;/ . If I were to get the cpu usage of the audio plugin down, I might be able to get stable 60fps with sync audio.

Here's a macro that is a bottleneck.

VMULF_operation(index, dest, s1, s2, wrElement, wrHiAccum, wrLoAccum, wrFlag0) {
	if (wrElement || wrHiAccum || wrLoAccum) {									
		_s32	result = ((_s32)(_s16)(s1) * (_s32)(_s16)(s2));					
		if (wrLoAccum) accumulator[index] = (((_u16)(result << 1)) ^ 0x8000);	
		if (wrElement || wrHiAccum) {											
			_s32	hiValue = (result >> 15);									
			if (result & 0x4000) hiValue++;										
			if (wrHiAccum) accumulator_hi[index].S32 = hiValue;					
			if (wrElement) {													
				Vector_ClampValue(hiValue);										
				(*(_u16*)&(dest)) = (_u16)hiValue;								
			}
		}
	}	
}

In the meantime, I'll try learning the API for DSound and XAudio2.

Also, which do you guys think is more accurate for your typical commercial game, using 1964 HLE audio, or LLE using PJ64's RSP recompiler? I know the HLE one doesn't support every game yet.