From 36411defd22b76cae1231896a9b4c4b6ada920f9 Mon Sep 17 00:00:00 2001
From: LTVA1 <87536432+LTVA1@users.noreply.github.com>
Date: Thu, 22 Aug 2024 19:48:35 +0300
Subject: [PATCH] fix software DAC sample rate being dependent on chip clock

---
 src/engine/platform/sid3.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/engine/platform/sid3.cpp b/src/engine/platform/sid3.cpp
index c670d3ff2..dd2cfa725 100644
--- a/src/engine/platform/sid3.cpp
+++ b/src/engine/platform/sid3.cpp
@@ -111,7 +111,11 @@ void DivPlatformSID3::acquire(short** buf, size_t len)
         int dacData=s->data16[chan[SID3_NUM_CHANNELS - 1].dacPos] + 32767;
         chan[SID3_NUM_CHANNELS - 1].dacOut=CLAMP(dacData,0,65535);
         updateSample = true;
-        sampleTick = 0;
+
+        if (sampleTick > 2)
+        {
+            sampleTick = 0;
+        }
 
         chan[SID3_NUM_CHANNELS - 1].dacPos++;
         if (s->isLoopable() && chan[SID3_NUM_CHANNELS - 1].dacPos>=(unsigned int)s->loopEnd) 
@@ -124,6 +128,10 @@ void DivPlatformSID3::acquire(short** buf, size_t len)
         }
         chan[SID3_NUM_CHANNELS - 1].dacPeriod-=rate;
       }
+      while (chan[SID3_NUM_CHANNELS - 1].dacPeriod > rate)
+      {
+          chan[SID3_NUM_CHANNELS - 1].dacPeriod -= rate;
+      }
     }
 
     sampleTick++;
@@ -711,7 +719,7 @@ void DivPlatformSID3::tick(bool sysTick)
             off=(double)s->centerRate/8363.0;
           }
         }
-        chan[i].dacRate=chan[i].freq*(off / 32.0);
+        chan[i].dacRate=chan[i].freq*(off / 32.0)*(double)chipClock/1000000.0;
       }
 
       chan[i].noiseFreqChanged = true;