Sound Blaster: Fix force autoinit option bug that prevented audio pla…

…yback from working at all

CHANGELOG

@@ -1,4 +1,6 @@
 Next:
+  - Sound Blaster: Fix bug where "force autoinit" prevented Sound Blaster
+    playback from working at all, fix for "Jump" by Public NMI (joncampbell123).
   - Debugger UI now shows PIC_FullIndex() and whether or not the CPU is
     in the HLT state. Single stepping does not do anything when the CPU is
     in the HLT state, so at least let the user know (joncampbell123).

src/hardware/sblaster.cpp

@@ -1300,10 +1300,12 @@ static unsigned int DSP_RateLimitedFinalSB16Freq_New(unsigned int freq) {
 }
 
 static void DSP_PrepareDMA_Old(DMA_MODES mode,bool autoinit,bool sign,bool hispeed) {
+    /* this must be processed BEFORE forcing auto-init because the non-autoinit case provides the DSP transfer block size (fix for "Jump" by Public NMI) */
+    if (!autoinit) sb.dma.total=1u+(unsigned int)sb.dsp.in.data[0]+(unsigned int)(sb.dsp.in.data[1] << 8u);
+
     if (sb.dma.force_autoinit)
         autoinit = true;
 
-    if (!autoinit) sb.dma.total=1u+(unsigned int)sb.dsp.in.data[0]+(unsigned int)(sb.dsp.in.data[1] << 8u);
     sb.dma.autoinit=autoinit;
     sb.dsp.highspeed=hispeed;
     sb.dma.sign=sign;