From 6ca3c4ec4df5f4bd7ea43b5947f0aa9623b11ffe Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 17 Jan 2022 01:42:26 -0500
Subject: [PATCH] dynamic audio settings changing

---
 src/engine/dispatchContainer.cpp | 37 ++++++++++++++++++++++++--------
 src/engine/engine.cpp            | 32 +++++++++++++++++++++------
 src/engine/engine.h              | 10 ++++++++-
 src/gui/gui.cpp                  |  2 ++
 4 files changed, 64 insertions(+), 17 deletions(-)

diff --git a/src/engine/dispatchContainer.cpp b/src/engine/dispatchContainer.cpp
index 50126b1d0..6affaffab 100644
--- a/src/engine/dispatchContainer.cpp
+++ b/src/engine/dispatchContainer.cpp
@@ -1,3 +1,4 @@
+#include "blip_buf.h"
 #include "engine.h"
 #include "platform/genesis.h"
 #include "platform/genesisext.h"
@@ -22,21 +23,39 @@ void DivDispatchContainer::setRates(double gotRate) {
   blip_set_rates(bb[1],dispatch->rate,gotRate);
 }
 
+void DivDispatchContainer::setQuality(bool lowQual) {
+  lowQuality=lowQual;
+}
+
 void DivDispatchContainer::acquire(size_t offset, size_t count) {
   dispatch->acquire(bbIn[0],bbIn[1],offset,count);
 }
 
 void DivDispatchContainer::fillBuf(size_t runtotal, size_t size) {
-  for (size_t i=0; i<runtotal; i++) {
-    temp[0]=bbIn[0][i];
-    blip_add_delta(bb[0],i,temp[0]-prevSample[0]);
-    prevSample[0]=temp[0];
-  }
+  if (lowQuality) {
+    for (size_t i=0; i<runtotal; i++) {
+      temp[0]=bbIn[0][i];
+      blip_add_delta_fast(bb[0],i,temp[0]-prevSample[0]);
+      prevSample[0]=temp[0];
+    }
 
-  if (dispatch->isStereo()) for (size_t i=0; i<runtotal; i++) {
-    temp[1]=bbIn[1][i];
-    blip_add_delta(bb[1],i,temp[1]-prevSample[1]);
-    prevSample[1]=temp[1];
+    if (dispatch->isStereo()) for (size_t i=0; i<runtotal; i++) {
+      temp[1]=bbIn[1][i];
+      blip_add_delta_fast(bb[1],i,temp[1]-prevSample[1]);
+      prevSample[1]=temp[1];
+    }
+  } else {
+    for (size_t i=0; i<runtotal; i++) {
+      temp[0]=bbIn[0][i];
+      blip_add_delta(bb[0],i,temp[0]-prevSample[0]);
+      prevSample[0]=temp[0];
+    }
+
+    if (dispatch->isStereo()) for (size_t i=0; i<runtotal; i++) {
+      temp[1]=bbIn[1][i];
+      blip_add_delta(bb[1],i,temp[1]-prevSample[1]);
+      prevSample[1]=temp[1];
+    }
   }
 
   blip_end_frame(bb[0],runtotal);
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 75aa24241..c0e0a3fb2 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -3166,11 +3166,25 @@ void DivEngine::setConsoleMode(bool enable) {
   consoleMode=enable;
 }
 
+void DivEngine::switchMaster() {
+  deinitAudioBackend();
+  if (initAudioBackend()) {
+    for (int i=0; i<song.systemLen; i++) {
+      disCont[i].setRates(got.rate);
+      disCont[i].setQuality(lowQuality);
+    }
+    if (!output->setRun(true)) {
+      logE("error while activating audio!\n");
+    }
+  }
+}
+
 void DivEngine::initDispatch() {
   isBusy.lock();
   for (int i=0; i<song.systemLen; i++) {
     disCont[i].init(song.system[i],this,getChannelCount(song.system[i]),got.rate,(!song.pal) || (song.customTempo!=0 && song.hz<53));
     disCont[i].setRates(got.rate);
+    disCont[i].setQuality(lowQuality);
   }
   recalcChans();
   isBusy.unlock();
@@ -3226,6 +3240,15 @@ void DivEngine::quitDispatch() {
   }
 
 bool DivEngine::initAudioBackend() {
+  // load values
+  if (getConfString("audioEngine","SDL")=="JACK") {
+    audioEngine=DIV_AUDIO_JACK;
+  } else {
+    audioEngine=DIV_AUDIO_SDL;
+  }
+
+  lowQuality=getConfInt("audioQuality",0);
+
   switch (audioEngine) {
     case DIV_AUDIO_JACK:
 #ifndef HAVE_JACK
@@ -3257,6 +3280,8 @@ bool DivEngine::initAudioBackend() {
   logI("initializing audio.\n");
   if (!output->init(want,got)) {
     logE("error while initializing audio!\n");
+    delete output;
+    output=NULL;
     return false;
   }
   return true;
@@ -3301,13 +3326,6 @@ bool DivEngine::init() {
 
   loadConf();
 
-  // load values
-  if (getConfString("audioEngine","SDL")=="JACK") {
-    audioEngine=DIV_AUDIO_JACK;
-  } else {
-    audioEngine=DIV_AUDIO_SDL;
-  }
-
   // init the rest of engine
   if (!initAudioBackend()) return false;
 
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 43209fd50..7c4933aa2 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -86,8 +86,10 @@ struct DivDispatchContainer {
   int temp[2], prevSample[2];
   short* bbIn[2];
   short* bbOut[2];
+  bool lowQuality;
 
   void setRates(double gotRate);
+  void setQuality(bool lowQual);
   void acquire(size_t offset, size_t count);
   void fillBuf(size_t runtotal, size_t size);
   void clear();
@@ -100,7 +102,8 @@ struct DivDispatchContainer {
     temp{0,0},
     prevSample{0,0},
     bbIn{NULL,NULL},
-    bbOut{NULL,NULL} {}
+    bbOut{NULL,NULL},
+    lowQuality(false) {}
 };
 
 class DivEngine {
@@ -109,6 +112,7 @@ class DivEngine {
   TAAudioDesc want, got;
   int chans;
   bool active;
+  bool lowQuality;
   bool playing;
   bool freelance;
   bool speedAB;
@@ -424,6 +428,9 @@ class DivEngine {
 
     // get last error
     String getLastError();
+    
+    // switch master
+    void switchMaster();
 
     // init dispatch
     void initDispatch();
@@ -443,6 +450,7 @@ class DivEngine {
       output(NULL),
       chans(0),
       active(false),
+      lowQuality(false),
       playing(false),
       freelance(false),
       speedAB(false),
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 4d1667abb..c5de734ca 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1923,6 +1923,8 @@ void FurnaceGUI::commitSettings() {
 
   e->saveConf();
 
+  e->switchMaster();
+
   ImGui::GetIO().Fonts->Clear();
   if ((mainFont=ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF(defFont_main_compressed_data,defFont_main_compressed_size,e->getConfInt("mainFontSize",18)*dpiScale))==NULL) {
     logE("could not load UI font!\n");