fade out experiments - DO NOT COMPILE

TODO.md

@@ -1,5 +1,6 @@
 # to-do for 0.6pre1
 
+- fade out in audio export
 - rewrite the system name detection function anyway
 - add another FM editor layout
 - add ability to move selection by dragging

src/engine/engine.cpp

@@ -193,6 +193,9 @@ bool DivEngine::isExporting() {
 
 #ifdef HAVE_SNDFILE
 void DivEngine::runExportThread() {
+  size_t fadeOutSamples=got.rate*exportFadeOut;
+  size_t curFadeOutSample=0;
+  bool isFadingOut=false;
   switch (exportMode) {
     case DIV_EXPORT_MODE_ONE: {
       SNDFILE* sf;
@@ -220,15 +223,36 @@ void DivEngine::runExportThread() {
       logI("rendering to file...");
 
       while (playing) {
+        size_t total=0;
         nextBuf(NULL,outBuf,0,2,EXPORT_BUFSIZE);
-        for (int i=0; i<EXPORT_BUFSIZE; i++) {
-          outBuf[2][i<<1]=MAX(-1.0f,MIN(1.0f,outBuf[0][i]));
-          outBuf[2][1+(i<<1)]=MAX(-1.0f,MIN(1.0f,outBuf[1][i]));
-        }
         if (totalProcessed>EXPORT_BUFSIZE) {
           logE("error: total processed is bigger than export bufsize! %d>%d",totalProcessed,EXPORT_BUFSIZE);
+          totalProcessed=EXPORT_BUFSIZE;
         }
-        if (sf_writef_float(sf,outBuf[2],totalProcessed)!=(int)totalProcessed) {
+        if (totalProcessed!=EXPORT_BUFSIZE) {
+          logW("wait what? %d != %d",totalProcessed,EXPORT_BUFSIZE);
+        }
+        for (int i=0; i<(int)totalProcessed; i++) {
+          total++;
+          if (isFadingOut) {
+            double mul=(1.0-((double)curFadeOutSample/(double)fadeOutSamples));
+            outBuf[2][i<<1]=MAX(-1.0f,MIN(1.0f,outBuf[0][i]))*mul;
+            outBuf[2][1+(i<<1)]=MAX(-1.0f,MIN(1.0f,outBuf[1][i]))*mul;
+            if (++curFadeOutSample>=fadeOutSamples) {
+              playing=false;
+              break;
+            }
+          } else {
+            outBuf[2][i<<1]=MAX(-1.0f,MIN(1.0f,outBuf[0][i]));
+            outBuf[2][1+(i<<1)]=MAX(-1.0f,MIN(1.0f,outBuf[1][i]));
+            if (lastLoopPos>-1 && i>=lastLoopPos && totalLoops>=exportLoopCount) {
+              logD("start fading out...");
+              isFadingOut=true;
+            }
+          }
+        }
+        
+        if (sf_writef_float(sf,outBuf[2],total)!=(int)total) {
           logE("error: failed to write entire buffer!");
           break;
         }
@@ -382,7 +406,12 @@ void DivEngine::runExportThread() {
         }
         
         curOrder=0;
-        remainingLoops=loopCount;
+        prevOrder=0;
+        if (exportFadeOut<=0.01) {
+          remainingLoops=loopCount;
+        } else {
+          remainingLoops=-1;
+        }
         playSub(false);
 
         while (playing) {
@@ -448,13 +477,14 @@ void DivEngine::runExportThread() {
 }
 #endif
 
-bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode) {
+bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode, double fadeOutTime) {
 #ifndef HAVE_SNDFILE
   logE("Furnace was not compiled with libsndfile. cannot export!");
   return false;
 #else
   exportPath=path;
   exportMode=mode;
+  exportFadeOut=fadeOutTime;
   if (exportMode!=DIV_EXPORT_MODE_ONE) {
     // remove extension
     String lowerCase=exportPath;
@@ -471,7 +501,12 @@ bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode)
   stop();
   repeatPattern=false;
   setOrder(0);
-  remainingLoops=loops;
+  if (exportFadeOut<=0.01) {
+    remainingLoops=loops;
+  } else {
+    remainingLoops=-1;
+  }
+  exportLoopCount=loops;
   exportThread=new std::thread(_runExportThread,this);
   return true;
 #endif
@@ -1131,6 +1166,8 @@ void DivEngine::playSub(bool preserveDrift, int goalRow) {
     totalTicks=0;
     totalSeconds=0;
     totalTicksR=0;
+    totalLoops=0;
+    lastLoopPos=-1;
   }
   speedAB=false;
   playing=true;

src/engine/engine.h

@@ -303,7 +303,7 @@ class DivEngine {
   bool systemsRegistered;
   bool hasLoadedSomething;
   int softLockCount;
-  int subticks, ticks, curRow, curOrder, prevRow, prevOrder, remainingLoops, nextSpeed;
+  int subticks, ticks, curRow, curOrder, prevRow, prevOrder, remainingLoops, totalLoops, lastLoopPos, exportLoopCount, nextSpeed;
   size_t curSubSongIndex;
   double divider;
   int cycles;
@@ -318,6 +318,7 @@ class DivEngine {
   DivChannelState chan[DIV_MAX_CHANS];
   DivAudioEngines audioEngine;
   DivAudioExportModes exportMode;
+  double exportFadeOut;
   std::map<String,String> conf;
   std::queue<DivNoteEvent> pendingNotes;
   bool isMuted[DIV_MAX_CHANS];
@@ -463,7 +464,7 @@ class DivEngine {
     // dump to VGM.
     SafeWriter* saveVGM(bool* sysToExport=NULL, bool loop=true, int version=0x171);
     // export to an audio file
-    bool saveAudio(const char* path, int loops, DivAudioExportModes mode);
+    bool saveAudio(const char* path, int loops, DivAudioExportModes mode, double fadeOutTime=0.0);
     // wait for audio export to finish
     void waitAudioFile();
     // stop audio file export
@@ -938,6 +939,9 @@ class DivEngine {
       prevRow(0),
       prevOrder(0),
       remainingLoops(-1),
+      totalLoops(0),
+      lastLoopPos(0),
+      exportLoopCount(0),
       nextSpeed(3),
       curSubSongIndex(0),
       divider(60),
@@ -961,6 +965,7 @@ class DivEngine {
       haltOn(DIV_HALT_NONE),
       audioEngine(DIV_AUDIO_NULL),
       exportMode(DIV_EXPORT_MODE_ONE),
+      exportFadeOut(0.0),
       midiBaseChan(0),
       midiPoly(true),
       midiAgeCounter(0),

src/engine/playback.cpp

@@ -1096,6 +1096,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
 }
 
 void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size) {
+  lastLoopPos=-1;
+
   if (out!=NULL) {
     memset(out[0],0,size*sizeof(float));
     memset(out[1],0,size*sizeof(float));
@@ -1287,6 +1289,9 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
         }
       }
       if (nextTick()) {
+        lastLoopPos=size-(runLeftG>>MASTER_CLOCK_PREC);
+        logD("last loop pos: %d for a size of %d and runLeftG of %d",lastLoopPos,size,runLeftG);
+        totalLoops++;
         if (remainingLoops>0) {
           remainingLoops--;
           if (!remainingLoops) {

src/gui/gui.cpp

@@ -1676,7 +1676,7 @@ int FurnaceGUI::load(String path) {
 }
 
 void FurnaceGUI::exportAudio(String path, DivAudioExportModes mode) {
-  e->saveAudio(path.c_str(),exportLoops+1,mode);
+  e->saveAudio(path.c_str(),exportLoops+1,mode,exportFadeOut);
   displayExporting=true;
 }
 
@@ -2827,6 +2827,9 @@ bool FurnaceGUI::loop() {
           if (ImGui::InputInt("Loops",&exportLoops,1,2)) {
             if (exportLoops<0) exportLoops=0;
           }
+          if (ImGui::InputDouble("Fade out (seconds)",&exportFadeOut,1.0,2.0,"%.1f")) {
+            if (exportFadeOut<0.0) exportFadeOut=0.0;
+          }
           ImGui::EndMenu();
         }
         if (ImGui::BeginMenu("export VGM...")) {
@@ -4351,6 +4354,7 @@ FurnaceGUI::FurnaceGUI():
   latchTarget(0),
   wheelX(0),
   wheelY(0),
+  exportFadeOut(5.0),
   editControlsOpen(true),
   ordersOpen(true),
   insListOpen(true),

src/gui/gui.h

@@ -1072,6 +1072,8 @@ class FurnaceGUI {
   int loopOrder, loopRow, loopEnd, isClipping, extraChannelButtons, patNameTarget, newSongCategory, latchTarget;
   int wheelX, wheelY;
 
+  double exportFadeOut;
+
   bool editControlsOpen, ordersOpen, insListOpen, songInfoOpen, patternOpen, insEditOpen;
   bool waveListOpen, waveEditOpen, sampleListOpen, sampleEditOpen, aboutOpen, settingsOpen;
   bool mixerOpen, debugOpen, inspectorOpen, oscOpen, volMeterOpen, statsOpen, compatFlagsOpen;