DC offset improvements

src/engine/platform/abstract.cpp

@@ -74,6 +74,14 @@ int DivDispatch::getPortaFloor(int ch) {
   return 0x00;
 }
 
+float DivDispatch::getPostAmp() {
+  return 1.0f;
+}
+
+bool DivDispatch::getDCOffRequired() {
+  return false;
+}
+
 const char* DivDispatch::getEffectName(unsigned char effect) {
   return NULL;
 }

src/engine/platform/ay.cpp

@@ -497,6 +497,10 @@ void DivPlatformAY8910::flushWrites() {
   while (!writes.empty()) writes.pop();
 }
 
+bool DivPlatformAY8910::getDCOffRequired() {
+  return true;
+}
+
 void DivPlatformAY8910::reset() {
   while (!writes.empty()) writes.pop();
   ay->device_reset();

src/engine/platform/ay.h

@@ -95,6 +95,7 @@ class DivPlatformAY8910: public DivDispatch {
     void setFlags(unsigned int flags);
     bool isStereo();
     bool keyOffAffectsArp(int ch);
+    bool getDCOffRequired();
     void notifyInsDeletion(void* ins);
     void poke(unsigned int addr, unsigned short val);
     void poke(std::vector<DivRegWrite>& wlist);

src/engine/platform/mmc5.cpp

@@ -89,7 +89,6 @@ void DivPlatformMMC5::acquire(short* bufL, short* bufR, size_t start, size_t len
     if (!isMuted[2]) {
       sample+=mmc5->pcm.output*2;
     }
-    sample=(sample-128)<<6;
     if (sample>32767) sample=32767;
     if (sample<-32768) sample=-32768;
     bufL[i]=sample;
@@ -336,6 +335,10 @@ int DivPlatformMMC5::getRegisterPoolSize() {
   return 32;
 }
 
+float DivPlatformMMC5::getPostAmp() {
+  return 64.0f;
+}
+
 void DivPlatformMMC5::reset() {
   for (int i=0; i<3; i++) {
     chan[i]=DivPlatformMMC5::Channel();

src/engine/platform/mmc5.h

@@ -74,6 +74,7 @@ class DivPlatformMMC5: public DivDispatch {
     void tick();
     void muteChannel(int ch, bool mute);
     bool keyOffAffectsArp(int ch);
+    float getPostAmp();
     void setFlags(unsigned int flags);
     void notifyInsDeletion(void* ins);
     void poke(unsigned int addr, unsigned short val);

src/engine/platform/nes.cpp

@@ -80,7 +80,14 @@ void DivPlatformNES::acquire(short* bufL, short* bufR, size_t start, size_t len)
         DivSample* s=parent->getSample(dacSample);
         if (s->samples>0) {
           if (!isMuted[4]) {
-            rWrite(0x4011,((unsigned char)s->data8[dacPos]+0x80)>>1);
+            unsigned char next=((unsigned char)s->data8[dacPos]+0x80)>>1;
+            if (dacAntiClickOn && dacAntiClick<next) {
+              dacAntiClick+=8;
+              rWrite(0x4011,dacAntiClick);
+            } else {
+              dacAntiClickOn=false;
+              rWrite(0x4011,next);
+            }
           }
           if (++dacPos>=s->samples) {
             if (s->loopStart>=0 && s->loopStart<(int)s->samples) {
@@ -101,7 +108,7 @@ void DivPlatformNES::acquire(short* bufL, short* bufR, size_t start, size_t len)
     if (nes->apu.clocked) {
       nes->apu.clocked=false;
     }
-    int sample=(pulse_output(nes)+tnd_output(nes)-128)<<7;
+    int sample=(pulse_output(nes)+tnd_output(nes));
     if (sample>32767) sample=32767;
     if (sample<-32768) sample=-32768;
     bufL[i]=sample;
@@ -454,6 +461,10 @@ int DivPlatformNES::getRegisterPoolSize() {
   return 32;
 }
 
+float DivPlatformNES::getPostAmp() {
+  return 128.0f;
+}
+
 void DivPlatformNES::reset() {
   for (int i=0; i<5; i++) {
     chan[i]=DivPlatformNES::Channel();
@@ -476,6 +487,9 @@ void DivPlatformNES::reset() {
   rWrite(0x4015,0x1f);
   rWrite(0x4001,chan[0].sweep);
   rWrite(0x4005,chan[1].sweep);
+
+  dacAntiClickOn=true;
+  dacAntiClick=0;
 }
 
 bool DivPlatformNES::keyOffAffectsArp(int ch) {

src/engine/platform/nes.h

@@ -54,10 +54,11 @@ class DivPlatformNES: public DivDispatch {
   Channel chan[5];
   bool isMuted[5];
   int dacPeriod, dacRate;
-  unsigned int dacPos;
+  unsigned int dacPos, dacAntiClick;
   int dacSample;
   unsigned char sampleBank;
   unsigned char apuType;
+  bool dacAntiClickOn;
   struct NESAPU* nes;
   unsigned char regPool[128];
 
@@ -74,6 +75,7 @@ class DivPlatformNES: public DivDispatch {
     void tick();
     void muteChannel(int ch, bool mute);
     bool keyOffAffectsArp(int ch);
+    float getPostAmp();
     void setFlags(unsigned int flags);
     void notifyInsDeletion(void* ins);
     void poke(unsigned int addr, unsigned short val);

src/engine/platform/saa.cpp

@@ -414,6 +414,16 @@ void DivPlatformSAA1099::reset() {
 
   extMode=false;
 
+  rWrite(8,255);
+  rWrite(9,255);
+  rWrite(10,255);
+  rWrite(11,255);
+  rWrite(12,255);
+  rWrite(13,255);
+  rWrite(16,0x77);
+  rWrite(17,0x77);
+  rWrite(18,0x77);
+  rWrite(0x1c,2);
   rWrite(0x1c,1);
 }
 

src/engine/platform/sound/nes/apu.c

@@ -213,7 +213,8 @@ void apu_turn_on(struct NESAPU* a, BYTE apu_type) {
 	a->S2.sweep.delay = 1;
 	a->S2.sweep.divider = 1;
 	a->TR.frequency = 1;
-	a->TR.sequencer = 0;
+  /* questo era 0 ma produce click nell'audio */
+	a->TR.sequencer = 7;
 	a->NS.frequency = 1;
 	a->NS.shift = 1;
 	a->DMC.frequency = 1;