From 1ffbfe17d458733773ea141579f9a9a8f3e39b4e Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Fri, 13 May 2022 17:40:05 -0500
Subject: [PATCH] Y8950/YMU759: ADPCM muting

---
 src/engine/platform/opl.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index 5ba5342f6..fe8fd4397 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -285,9 +285,13 @@ void DivPlatformOPL::acquire_nuked(short* bufL, short* bufR, size_t start, size_
       aOut.clear();
       adpcmB->output<2>(aOut,0);
 
-      os[0]+=aOut.data[0];
-      os[1]+=aOut.data[0];
-      oscBuf[adpcmChan]->data[oscBuf[adpcmChan]->needle++]+=aOut.data[0];
+      if (!isMuted[adpcmChan]) {
+        os[0]+=aOut.data[0];
+        os[1]+=aOut.data[0];
+        oscBuf[adpcmChan]->data[oscBuf[adpcmChan]->needle++]+=aOut.data[0];
+      } else {
+        oscBuf[adpcmChan]->data[oscBuf[adpcmChan]->needle++]=0;
+      }
     }
 
     for (int i=0; i<chans; i++) {
@@ -668,6 +672,7 @@ int DivPlatformOPL::toFreq(int freq) {
 
 void DivPlatformOPL::muteChannel(int ch, bool mute) {
   isMuted[ch]=mute;
+  if (ch==adpcmChan) return;
   if (oplType<3 && ch<melodicChans) {
     fm.channel[outChanMap[ch]].muted=mute;
   }