audio issue debugging

src/audio/sdlAudio.cpp

@@ -127,14 +127,20 @@ bool TAAudioSDL::init(TAAudioDesc& request, TAAudioDesc& response) {
   ac.callback=taSDLProcess;
   ac.userdata=this;
 
-  ai=SDL_OpenAudioDevice(request.deviceName.empty()?NULL:request.deviceName.c_str(),0,&ac,&ar,SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
+  ai=SDL_OpenAudioDevice(request.deviceName.empty()?NULL:request.deviceName.c_str(),0,&ac,&ar,0);
   if (ai==0) {
     logE("could not open audio device: %s",SDL_GetError());
     return false;
   }
 
+  const char* backendName=SDL_GetCurrentAudioDriver();
+
   desc.deviceName=request.deviceName;
-  desc.name="";
+  if (backendName==NULL) {
+    desc.name="";
+  } else {
+    desc.name=backendName;
+  }
   desc.rate=ar.freq;
   desc.inChans=0;
   desc.outChans=ar.channels;

src/engine/engine.h

@@ -570,6 +570,7 @@ class DivEngine {
     float oscSize;
     int oscReadPos, oscWritePos;
     int tickMult;
+    int lastNBIns, lastNBOuts, lastNBSize;
     std::atomic<size_t> processTime;
 
     void runExportThread();
@@ -1252,6 +1253,9 @@ class DivEngine {
       oscReadPos(0),
       oscWritePos(0),
       tickMult(1),
+      lastNBIns(0),
+      lastNBOuts(0),
+      lastNBSize(0),
       processTime(0),
       yrw801ROM(NULL),
       tg100ROM(NULL),

src/engine/playback.cpp

@@ -1694,6 +1694,10 @@ void DivEngine::runMidiTime(int totalCycles) {
 }
 
 void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsigned int size) {
+  lastNBIns=inChans;
+  lastNBOuts=outChans;
+  lastNBSize=size;
+
   if (!size) {
     logW("nextBuf called with size 0!");
     return;

src/gui/debugWindow.cpp

@@ -388,6 +388,34 @@ void FurnaceGUI::drawDebug() {
       ImGui::Text("System Managed Scale: %d",sysManagedScale);
       ImGui::TreePop();
     }
+    if (ImGui::TreeNode("Audio Debug")) {
+      TAAudioDesc& audioWant=e->getAudioDescWant();
+      TAAudioDesc& audioGot=e->getAudioDescGot();
+
+      ImGui::Text("want:");
+      ImGui::Text("- name: %s",audioWant.name.c_str());
+      ImGui::Text("- device name: %s",audioWant.deviceName.c_str());
+      ImGui::Text("- rate: %f",audioWant.rate);
+      ImGui::Text("- buffer size: %d",audioWant.bufsize);
+      ImGui::Text("- fragments: %d",audioWant.fragments);
+      ImGui::Text("- inputs: %d",audioWant.inChans);
+      ImGui::Text("- outputs: %d",audioWant.outChans);
+      ImGui::Text("- format: %d",audioWant.outFormat);
+
+      ImGui::Text("got:");
+      ImGui::Text("- name: %s",audioGot.name.c_str());
+      ImGui::Text("- device name: %s",audioGot.deviceName.c_str());
+      ImGui::Text("- rate: %f",audioGot.rate);
+      ImGui::Text("- buffer size: %d",audioGot.bufsize);
+      ImGui::Text("- fragments: %d",audioGot.fragments);
+      ImGui::Text("- inputs: %d",audioGot.inChans);
+      ImGui::Text("- outputs: %d",audioGot.outChans);
+      ImGui::Text("- format: %d",audioGot.outFormat);
+
+      ImGui::Text("last call to nextBuf(): in %d, out %d, size %d",e->lastNBIns,e->lastNBOuts,e->lastNBSize);
+
+      ImGui::TreePop();
+    }
     if (ImGui::TreeNode("Visualizer Debug")) {
       if (ImGui::BeginTable("visX",3,ImGuiTableFlags_Borders)) {
         ImGui::TableNextRow(ImGuiTableRowFlags_Headers);