add WASAPI exclusive mode flag to PortAudio backen

d

src/audio/pa.cpp

@@ -21,6 +21,9 @@
 #include <vector>
 #include "../ta-log.h"
 #include "pa.h"
+#ifdef _WIN32
+#include <pa_win_wasapi.h>
+#endif
 
 int taPAProcess(const void* in, void* out, unsigned long nframes, const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags flags, void* inst) {
   TAAudioPA* instance=(TAAudioPA*)inst;
@@ -117,8 +120,18 @@ std::vector<String> TAAudioPA::listAudioDevices() {
     if (devInfo==NULL) continue;
     if (devInfo->maxOutputChannels<1) continue;
 
+    String devName;
+
+    const PaHostApiInfo* driverInfo=Pa_GetHostApiInfo(devInfo->hostApi);
+    if (driverInfo==NULL) {
+      devName+="[???] ";
+    } else {
+      devName+=fmt::sprintf("[%s] ",driverInfo->name);
+    }
+
     if (devInfo->name!=NULL) {
-      ret.push_back(String(devInfo->name));
+      devName+=devInfo->name;
+      ret.push_back(devName);
     }
   }
 
@@ -146,11 +159,15 @@ bool TAAudioPA::init(TAAudioDesc& request, TAAudioDesc& response) {
   desc.outFormat=TA_AUDIO_FORMAT_F32;
 
   const PaDeviceInfo* devInfo=NULL;
+  const PaHostApiInfo* driverInfo=NULL;
   int outDeviceID=0;
 
   if (desc.deviceName.empty()) {
     outDeviceID=Pa_GetDefaultOutputDevice();
     devInfo=Pa_GetDeviceInfo(outDeviceID);
+    if (devInfo!=NULL) {
+      driverInfo=Pa_GetHostApiInfo(devInfo->hostApi);
+    }
   } else {
     int count=Pa_GetDeviceCount();
     bool found=false;
@@ -164,12 +181,25 @@ bool TAAudioPA::init(TAAudioDesc& request, TAAudioDesc& response) {
       if (devInfo==NULL) continue;
       if (devInfo->maxOutputChannels<1) continue;
 
+      String devName;
+
+      driverInfo=Pa_GetHostApiInfo(devInfo->hostApi);
+      if (driverInfo==NULL) {
+        devName+="[???] ";
+      } else {
+        devName+=fmt::sprintf("[%s] ",driverInfo->name);
+      }
+
       if (devInfo->name!=NULL) {
-        if (strcmp(devInfo->name,desc.deviceName.c_str())==0) {
-          outDeviceID=i;
-          found=true;
-          break;
-        }
+        devName+=devInfo->name;
+      } else {
+        continue;
+      }
+
+      if (devName==desc.deviceName) {
+        outDeviceID=i;
+        found=true;
+        break;
       }
     }
     if (!found) {
@@ -190,6 +220,27 @@ bool TAAudioPA::init(TAAudioDesc& request, TAAudioDesc& response) {
   outParams.suggestedLatency=(double)(desc.bufsize*desc.fragments)/desc.rate;
   outParams.hostApiSpecificStreamInfo=NULL;
 
+  if (driverInfo!=NULL) {
+    if (driverInfo->type==paWASAPI) {
+      logV("setting WASAPI-specific flags");
+      PaWasapiStreamInfo* wasapiInfo=new PaWasapiStreamInfo;
+      memset(wasapiInfo,0,sizeof(PaWasapiStreamInfo));
+      wasapiInfo->size=sizeof(PaWasapiStreamInfo);
+      wasapiInfo->hostApiType=paWASAPI;
+      wasapiInfo->version=1;
+      wasapiInfo->flags=paWinWasapiThreadPriority;
+      wasapiInfo->threadPriority=eThreadPriorityProAudio;
+      wasapiInfo->streamCategory=eAudioCategoryMedia;
+      wasapiInfo->streamOption=eStreamOptionRaw;
+
+      if (desc.wasapiEx) {
+        wasapiInfo->flags|=paWinWasapiExclusive;
+      }
+
+      outParams.hostApiSpecificStreamInfo=wasapiInfo;
+    }
+  }
+
   logV("opening audio device...");
   status=Pa_OpenStream(
     &ac,

src/audio/taAudio.h

@@ -58,13 +58,16 @@ struct TAAudioDesc {
   unsigned char inChans, outChans;
   TAAudioFormat outFormat;
 
+  bool wasapiEx;
+
   TAAudioDesc():
     rate(0.0),
     bufsize(0),
     fragments(0),
     inChans(0),
     outChans(0),
-    outFormat(TA_AUDIO_FORMAT_F32) {}
+    outFormat(TA_AUDIO_FORMAT_F32),
+    wasapiEx(false) {}
 };
 
 

src/engine/engine.cpp

@@ -3370,6 +3370,7 @@ bool DivEngine::initAudioBackend() {
   want.inChans=0;
   want.outChans=getConfInt("audioChans",2);
   want.outFormat=TA_AUDIO_FORMAT_F32;
+  want.wasapiEx=getConfInt("wasapiEx",0);
   want.name="Furnace";
 
   if (want.outChans<1) want.outChans=1;

src/gui/gui.h

@@ -1571,6 +1571,7 @@ class FurnaceGUI {
     int centerPopup;
     int insIconsStyle;
     int classicChipOptions;
+    int wasapiEx;
     unsigned int maxUndoSteps;
     String mainFontPath;
     String headFontPath;
@@ -1745,6 +1746,7 @@ class FurnaceGUI {
       centerPopup(1),
       insIconsStyle(1),
       classicChipOptions(0),
+      wasapiEx(0),
       maxUndoSteps(100),
       mainFontPath(""),
       headFontPath(""),

src/gui/settings.cpp

@@ -872,11 +872,11 @@ void FurnaceGUI::drawSettings() {
         }
 
         bool lowLatencyB=settings.lowLatency;
-        if (ImGui::Checkbox("Low-latency mode (experimental!)",&lowLatencyB)) {
+        if (ImGui::Checkbox("Low-latency mode",&lowLatencyB)) {
           settings.lowLatency=lowLatencyB;
         }
         if (ImGui::IsItemHovered()) {
-          ImGui::SetTooltip("reduces latency by running the engine faster than the tick rate.\nuseful for live playback/jam mode.\n\nwarning: experimental! may produce glitches.\nonly enable if your buffer size is small (10ms or less).");
+          ImGui::SetTooltip("reduces latency by running the engine faster than the tick rate.\nuseful for live playback/jam mode.\n\nwarning: nonly enable if your buffer size is small (10ms or less).");
         }
 
         bool forceMonoB=settings.forceMono;
@@ -884,6 +884,15 @@ void FurnaceGUI::drawSettings() {
           settings.forceMono=forceMonoB;
         }
 
+        if (settings.audioEngine==DIV_AUDIO_PORTAUDIO) {
+          if (settings.audioDevice.find("[Windows WASAPI] ")==0) {
+            bool wasapiExB=settings.wasapiEx;
+            if (ImGui::Checkbox("Exclusive mode",&wasapiExB)) {
+              settings.wasapiEx=wasapiExB;
+            }
+          }
+        }
+
         TAAudioDesc& audioWant=e->getAudioDescWant();
         TAAudioDesc& audioGot=e->getAudioDescGot();
 
@@ -3252,6 +3261,7 @@ void FurnaceGUI::syncSettings() {
   settings.centerPopup=e->getConfInt("centerPopup",1);
   settings.insIconsStyle=e->getConfInt("insIconsStyle",1);
   settings.classicChipOptions=e->getConfInt("classicChipOptions",0);
+  settings.wasapiEx=e->getConfInt("wasapiEx",0);
 
   clampSetting(settings.mainFontSize,2,96);
   clampSetting(settings.headFontSize,2,96);
@@ -3399,6 +3409,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.centerPopup,0,1);
   clampSetting(settings.insIconsStyle,0,2);
   clampSetting(settings.classicChipOptions,0,1);
+  clampSetting(settings.wasapiEx,0,1);
 
   if (settings.exportLoops<0.0) settings.exportLoops=0.0;
   if (settings.exportFadeOut<0.0) settings.exportFadeOut=0.0;
@@ -3653,6 +3664,7 @@ void FurnaceGUI::commitSettings() {
   e->setConf("centerPopup",settings.centerPopup);
   e->setConf("insIconsStyle",settings.insIconsStyle);
   e->setConf("classicChipOptions",settings.classicChipOptions);
+  e->setConf("wasapiEx",settings.wasapiEx);
 
   // colors
   for (int i=0; i<GUI_COLOR_MAX; i++) {