rewrite audio export

now it is possible to export audio from the GUI!
multiple export coming soon

src/engine/engine.cpp

@@ -2122,6 +2122,90 @@ SafeWriter* DivEngine::saveVGM() {
   return NULL;
 }
 
+void _runExportThread(DivEngine* caller) {
+  caller->runExportThread();
+}
+
+bool DivEngine::isExporting() {
+  return exporting;
+}
+
+#define EXPORT_BUFSIZE 2048
+
+void DivEngine::runExportThread() {
+  SNDFILE* sf;
+  SF_INFO si;
+  si.samplerate=got.rate;
+  si.channels=2;
+  si.format=SF_FORMAT_WAV|SF_FORMAT_PCM_16;
+
+  sf=sf_open(exportPath.c_str(),SFM_WRITE,&si);
+  if (sf==NULL) {
+    logE("could not open file for writing!\n");
+    return;
+  }
+
+  float* outBuf[3];
+  outBuf[0]=new float[EXPORT_BUFSIZE];
+  outBuf[1]=new float[EXPORT_BUFSIZE];
+  outBuf[2]=new float[EXPORT_BUFSIZE*2];
+
+  // take control of audio output
+  deinitAudioBackend();
+  playSub(false);
+
+  while (playing) {
+    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\n",totalProcessed,EXPORT_BUFSIZE);
+    }
+    if (sf_writef_float(sf,outBuf[2],totalProcessed)!=(int)totalProcessed) {
+      logE("error: failed to write entire buffer!\n");
+      break;
+    }
+  }
+
+  if (sf_close(sf)!=0) {
+    logE("could not close audio file!\n");
+  }
+  exporting=false;
+
+  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");
+    }
+  }
+}
+
+bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode) {
+  exportPath=path;
+  exporting=true;
+  stop();
+  setOrder(0);
+  remainingLoops=loops;
+  exportThread=new std::thread(_runExportThread,this);
+  return true;
+}
+
+void DivEngine::waitAudioFile() {
+  if (exportThread!=NULL) {
+    exportThread->join();
+  }
+}
+
+bool DivEngine::haltAudioFile() {
+  stop();
+  return true;
+}
+
 #ifdef _WIN32
 #define CONFIG_FILE "\\furnace.cfg"
 #else
@@ -2577,6 +2661,7 @@ void DivEngine::stop() {
   freelance=false;
   playing=false;
   extValuePresent=false;
+  remainingLoops=-1;
   isBusy.unlock();
 }
 

src/engine/engine.h

@@ -5,6 +5,7 @@
 #include "safeWriter.h"
 #include "../audio/taAudio.h"
 #include "blip_buf.h"
+#include <thread>
 #include <mutex>
 #include <map>
 #include <queue>
@@ -23,6 +24,12 @@ enum DivAudioEngines {
   DIV_AUDIO_SDL=1
 };
 
+enum DivAudioExportModes {
+  DIV_EXPORT_MODE_ONE=0,
+  DIV_EXPORT_MODE_MANY_SYS,
+  DIV_EXPORT_MODE_MANY_CHAN
+};
+
 struct DivChannelState {
   std::vector<DivDelayedCommand> delayed;
   int note, oldNote, pitch, portaSpeed, portaNote;
@@ -110,6 +117,8 @@ class DivEngine {
   DivDispatchContainer disCont[32];
   TAAudio* output;
   TAAudioDesc want, got;
+  String exportPath;
+  std::thread* exportThread;
   int chans;
   bool active;
   bool lowQuality;
@@ -121,6 +130,7 @@ class DivEngine {
   bool extValuePresent;
   bool repeatPattern;
   bool metronome;
+  bool exporting;
   int ticks, curRow, curOrder, remainingLoops, nextSpeed, divider;
   int cycles, clockDrift;
   int changeOrd, changePos, totalSeconds, totalTicks, totalTicksR, totalCmds, lastCmds, cmdsPerSecond, globalPitch;
@@ -129,6 +139,7 @@ class DivEngine {
   DivStatusView view;
   DivChannelState chan[DIV_MAX_CHANS];
   DivAudioEngines audioEngine;
+  DivAudioExportModes exportMode;
   std::map<String,String> conf;
   std::queue<DivNoteEvent> pendingNotes;
   bool isMuted[DIV_MAX_CHANS];
@@ -185,6 +196,7 @@ class DivEngine {
 
   public:
     DivSong song;
+    void runExportThread();
     void nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size);
     DivInstrument* getIns(int index);
     DivWavetable* getWave(int index);
@@ -202,7 +214,7 @@ class DivEngine {
     // dump to VGM (TODO).
     SafeWriter* saveVGM();
     // export to an audio file
-    bool saveAudio(const char* path);
+    bool saveAudio(const char* path, int loops, DivAudioExportModes mode);
     // wait for audio export to finish
     void waitAudioFile();
     // stop audio file export
@@ -338,6 +350,9 @@ class DivEngine {
     // is playing
     bool isPlaying();
 
+    // is exporting
+    bool isExporting();
+
     // add instrument
     int addInstrument(int refChan=0);
 
@@ -448,6 +463,7 @@ class DivEngine {
 
     DivEngine():
       output(NULL),
+      exportThread(NULL),
       chans(0),
       active(false),
       lowQuality(false),
@@ -459,6 +475,7 @@ class DivEngine {
       extValuePresent(false),
       repeatPattern(false),
       metronome(false),
+      exporting(false),
       ticks(0),
       curRow(0),
       curOrder(0),

src/engine/playback.cpp

@@ -962,7 +962,14 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
       if (nextTick()) {
         if (remainingLoops>0) {
           remainingLoops--;
-          if (!remainingLoops) logI("end of song!\n");
+          if (!remainingLoops) {
+            logI("end of song!\n");
+            remainingLoops=-1;
+            playing=false;
+            freelance=false;
+            extValuePresent=false;
+            break;
+          }
         }
       }
     } else {
@@ -993,7 +1000,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
     playing=false;
     extValuePresent=false;
   }
-  totalProcessed=(1+runPos[0])*got.rate/disCont[0].dispatch->rate;
+  totalProcessed=size-(runLeftG>>MASTER_CLOCK_PREC);
 
   for (int i=0; i<song.systemLen; i++) {
     disCont[i].fillBuf(runtotal[i],size);

src/gui/gui.cpp

@@ -2787,6 +2787,18 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
     case GUI_FILE_SAMPLE_SAVE:
       ImGuiFileDialog::Instance()->OpenModal("FileDialog","Save Sample","Wave file{.wav}",workingDir);
       break;
+    case GUI_FILE_EXPORT_AUDIO_ONE:
+      ImGuiFileDialog::Instance()->OpenModal("FileDialog","Export Audio","Wave file{.wav}",workingDir);
+      break;
+    case GUI_FILE_EXPORT_AUDIO_PER_SYS:
+      ImGuiFileDialog::Instance()->OpenModal("FileDialog","Export Audio","Wave file{.wav}",workingDir);
+      break;
+    case GUI_FILE_EXPORT_AUDIO_PER_CHANNEL:
+      ImGuiFileDialog::Instance()->OpenModal("FileDialog","Export Audio","Wave file{.wav}",workingDir);
+      break;
+    case GUI_FILE_EXPORT_VGM: case GUI_FILE_EXPORT_ROM:
+      showError("Coming soon!");
+      break;
   }
   curFileDialog=type;
 }
@@ -2949,6 +2961,11 @@ int FurnaceGUI::load(String path) {
   return 0;
 }
 
+void FurnaceGUI::exportAudio(String path, DivAudioExportModes mode) {
+  e->saveAudio(path.c_str(),exportLoops+1,mode);
+  displayExporting=true;
+}
+
 void FurnaceGUI::showWarning(String what, FurnaceGUIWarnings type) {
   warnString=what;
   warnAction=type;
@@ -3118,6 +3135,22 @@ bool FurnaceGUI::loop() {
         openFileDialog(GUI_FILE_SAVE);
       }
       ImGui::Separator();
+      if (ImGui::BeginMenu("export audio...")) {
+        if (ImGui::MenuItem("one file")) {
+          openFileDialog(GUI_FILE_EXPORT_AUDIO_ONE);
+        }
+        if (ImGui::MenuItem("multiple files (one per system)")) {
+          openFileDialog(GUI_FILE_EXPORT_AUDIO_PER_SYS);
+        }
+        if (ImGui::MenuItem("multiple files (one per channel)")) {
+          openFileDialog(GUI_FILE_EXPORT_AUDIO_PER_CHANNEL);
+        }
+        if (ImGui::InputInt("Loops",&exportLoops,1,2)) {
+          if (exportLoops<0) exportLoops=0;
+        }
+        ImGui::EndMenu();
+      }
+      ImGui::Separator();
       if (ImGui::BeginMenu("add system...")) {
         sysAddOption(DIV_SYSTEM_GENESIS);
         sysAddOption(DIV_SYSTEM_GENESIS_EXT);
@@ -3302,6 +3335,19 @@ bool FurnaceGUI::loop() {
                 e->song.sample[curSample]->save(copyOfName.c_str());
               }
               break;
+            case GUI_FILE_EXPORT_AUDIO_ONE:
+              exportAudio(copyOfName,DIV_EXPORT_MODE_ONE);
+              break;
+            case GUI_FILE_EXPORT_AUDIO_PER_SYS:
+              exportAudio(copyOfName,DIV_EXPORT_MODE_MANY_SYS);
+              break;
+            case GUI_FILE_EXPORT_AUDIO_PER_CHANNEL:
+              exportAudio(copyOfName,DIV_EXPORT_MODE_MANY_CHAN);
+              break;
+            case GUI_FILE_EXPORT_VGM:
+            case GUI_FILE_EXPORT_ROM:
+              showError("Coming soon!");
+              break;
           }
           curFileDialog=GUI_FILE_OPEN;
         }
@@ -3325,8 +3371,26 @@ bool FurnaceGUI::loop() {
       ImGui::OpenPopup("Error");
     }
 
+    if (displayExporting) {
+      displayExporting=false;
+      ImGui::OpenPopup("Rendering...");
+    }
+
     if (aboutOpen) drawAbout();
 
+    if (ImGui::BeginPopupModal("Rendering...",NULL,ImGuiWindowFlags_AlwaysAutoResize)) {
+      ImGui::Text("Please wait...\n");
+      if (ImGui::Button("Abort")) {
+        if (e->haltAudioFile()) {
+          ImGui::CloseCurrentPopup();
+        }
+      }
+      if (!e->isExporting()) {
+        ImGui::CloseCurrentPopup();
+      }
+      ImGui::EndPopup();
+    }
+
     if (ImGui::BeginPopupModal("Error",NULL,ImGuiWindowFlags_AlwaysAutoResize)) {
       ImGui::Text("%s",errorString.c_str());
       if (ImGui::Button("OK")) {
@@ -3544,6 +3608,7 @@ FurnaceGUI::FurnaceGUI():
   edit(false),
   modified(false),
   displayError(false),
+  displayExporting(false),
   curFileDialog(GUI_FILE_OPEN),
   warnAction(GUI_WARN_OPEN),
   scrW(1280),
@@ -3560,6 +3625,7 @@ FurnaceGUI::FurnaceGUI():
   oldOrder(0),
   oldOrder1(0),
   editStep(1),
+  exportLoops(0),
   editControlsOpen(true),
   ordersOpen(true),
   insListOpen(true),

src/gui/gui.h

@@ -80,7 +80,12 @@ enum FurnaceGUIFileDialogs {
   GUI_FILE_OPEN,
   GUI_FILE_SAVE,
   GUI_FILE_SAMPLE_OPEN,
-  GUI_FILE_SAMPLE_SAVE
+  GUI_FILE_SAMPLE_SAVE,
+  GUI_FILE_EXPORT_AUDIO_ONE,
+  GUI_FILE_EXPORT_AUDIO_PER_SYS,
+  GUI_FILE_EXPORT_AUDIO_PER_CHANNEL,
+  GUI_FILE_EXPORT_VGM,
+  GUI_FILE_EXPORT_ROM
 };
 
 enum FurnaceGUIWarnings {
@@ -147,7 +152,7 @@ class FurnaceGUI {
 
   String workingDir, fileName, clipboard, warnString, errorString, lastError, curFileName;
 
-  bool quit, warnQuit, willCommit, edit, modified, displayError;
+  bool quit, warnQuit, willCommit, edit, modified, displayError, displayExporting;
 
   FurnaceGUIFileDialogs curFileDialog;
   FurnaceGUIWarnings warnAction;
@@ -197,7 +202,7 @@ class FurnaceGUI {
 
   char finalLayoutPath[4096];
 
-  int curIns, curWave, curSample, curOctave, oldRow, oldOrder, oldOrder1, editStep;
+  int curIns, curWave, curSample, curOctave, oldRow, oldOrder, oldOrder1, editStep, exportLoops;
   bool editControlsOpen, ordersOpen, insListOpen, songInfoOpen, patternOpen, insEditOpen;
   bool waveListOpen, waveEditOpen, sampleListOpen, sampleEditOpen, aboutOpen, settingsOpen;
   bool mixerOpen;
@@ -291,6 +296,7 @@ class FurnaceGUI {
   void openFileDialog(FurnaceGUIFileDialogs type);
   int save(String path);
   int load(String path);
+  void exportAudio(String path, DivAudioExportModes mode);
 
   void showWarning(String what, FurnaceGUIWarnings type);
   void showError(String what);