add parameter parsing

src/engine/engine.cpp

@@ -2,6 +2,9 @@
 #include "safeReader.h"
 #include "../ta-log.h"
 #include "../audio/sdl.h"
+#ifdef HAVE_JACK
+#include "../audio/jack.h"
+#endif
 #include "platform/genesis.h"
 #include "platform/genesisext.h"
 #include "platform/sms.h"
@@ -677,15 +680,38 @@ void DivEngine::play() {
   
 }
 
+void DivEngine::setAudio(DivAudioEngines which) {
+  audioEngine=which;
+}
+
+void DivEngine::setView(DivStatusView which) {
+  view=which;
+}
+
 bool DivEngine::init() {
-  output=new TAAudioSDL;
+  switch (audioEngine) {
+    case DIV_AUDIO_JACK:
+#ifndef HAVE_JACK
+      logE("Furnace was not compiled with JACK support!\n");
+      return false;
+#else
+      output=new TAAudioJACK;
+#endif
+      break;
+    case DIV_AUDIO_SDL:
+      output=new TAAudioSDL;
+      break;
+    default:
+      logE("invalid audio engine!\n");
+      return false;
+  }
   want.bufsize=1024;
   want.rate=44100;
   want.fragments=2;
   want.inChans=0;
   want.outChans=2;
   want.outFormat=TA_AUDIO_FORMAT_F32;
-  want.name="DivAudio";
+  want.name="Furnace";
 
   output->setCallback(process,this);
 

src/engine/engine.h

@@ -11,6 +11,11 @@ enum DivStatusView {
   DIV_STATUS_COMMANDS
 };
 
+enum DivAudioEngines {
+  DIV_AUDIO_JACK=0,
+  DIV_AUDIO_SDL
+};
+
 struct DivChannelState {
   std::vector<DivDelayedCommand> delayed;
   int note, pitch, portaSpeed, portaNote;
@@ -54,6 +59,7 @@ class DivEngine {
   int changeOrd, changePos, totalTicks, totalCmds, lastCmds, cmdsPerSecond;
   DivStatusView view;
   DivChannelState chan[17];
+  DivAudioEngines audioEngine;
 
   short vibTable[64];
 
@@ -83,6 +89,12 @@ class DivEngine {
     // play
     void play();
 
+    // set the audio system.
+    void setAudio(DivAudioEngines which);
+
+    // set the view mode.
+    void setView(DivStatusView which);
+
     // initialize the engine.
     bool init();
 
@@ -101,6 +113,7 @@ class DivEngine {
       lastCmds(0),
       cmdsPerSecond(0),
       view(DIV_STATUS_PATTERN),
+      audioEngine(DIV_AUDIO_SDL),
       temp{0,0},
       prevSample{0,0} {}
 };

src/engine/platform/sound/pce_psg.cpp

@@ -76,7 +76,6 @@ static const int16_t Phase_Filter[2][7] =
 
 inline void PCE_PSG::UpdateOutputSub(const int32_t timestamp, psg_channel *ch, const int32_t samp0, const int32_t samp1)
 {
-  if (samp0!=0)
   HRBufs[0][0]+=samp0;
   HRBufs[1][0]+=samp1;
   /*