dispatch: add function to notify playback stopped

for the PC Speaker real driver

src/engine/dispatch.h

@@ -316,6 +316,11 @@ class DivDispatch {
      */
     virtual void notifyInsDeletion(void* ins);
 
+    /**
+     * notify that playback stopped.
+     */
+    virtual void notifyPlaybackStop();
+
     /**
      * force-retrigger instruments.
      */

src/engine/engine.cpp

@@ -828,6 +828,9 @@ void DivEngine::stop() {
   sPreview.sample=-1;
   sPreview.wave=-1;
   sPreview.pos=0;
+  for (int i=0; i<song.systemLen; i++) {
+    disCont[i].dispatch->notifyPlaybackStop();
+  }
   isBusy.unlock();
 }
 

src/engine/platform/abstract.cpp

@@ -97,6 +97,10 @@ void DivDispatch::notifyInsDeletion(void* ins) {
 
 }
 
+void DivDispatch::notifyPlaybackStop() {
+
+}
+
 void DivDispatch::forceIns() {
   
 }

src/engine/platform/pcspkr.cpp

@@ -344,6 +344,8 @@ void DivPlatformPCSpeaker::reset() {
     }
 #endif
     beepFreq(0);
+  } else {
+    beepFreq(0);
   }
 
   memset(regPool,0,2);
@@ -365,6 +367,10 @@ void DivPlatformPCSpeaker::notifyInsDeletion(void* ins) {
   }
 }
 
+void DivPlatformPCSpeaker::notifyPlaybackStop() {
+  beepFreq(0);
+}
+
 void DivPlatformPCSpeaker::poke(unsigned int addr, unsigned short val) {
   // ???
 }

src/engine/platform/pcspkr.h

@@ -82,6 +82,7 @@ class DivPlatformPCSpeaker: public DivDispatch {
     bool keyOffAffectsArp(int ch);
     void setFlags(unsigned int flags);
     void notifyInsDeletion(void* ins);
+    void notifyPlaybackStop();
     void poke(unsigned int addr, unsigned short val);
     void poke(std::vector<DivRegWrite>& wlist);
     const char** getRegisterSheet();