Temporary workaround to provide (only) WASAPI loopback input devices.

lib-src/portaudio-v19/include/pa_win_wasapi.h

@@ -263,6 +263,16 @@ int PaWasapi_GetDeviceDefaultFormat( void *pFormat, unsigned int nFormatSize, Pa
 int/*PaWasapiDeviceRole*/ PaWasapi_GetDeviceRole( PaDeviceIndex nDevice );
 
 
+/** Returns device loopback indicator.
+
+ @param nDevice device index.
+
+ @return 0 = Not loopback, 1 = loopback, < 0 = PaErrorCode
+         if PortAudio is not initialized or an error is encountered.
+*/
+int PaWasapi_IsLoopback( PaDeviceIndex nDevice );
+
+
 /** Boost thread priority of calling thread (MMCSS). Use it for Blocking Interface only for thread
     which makes calls to Pa_WriteStream/Pa_ReadStream.
 

lib-src/portaudio-v19/src/hostapi/wasapi/pa_win_wasapi.c

@@ -357,6 +357,9 @@ typedef struct PaWasapiDeviceInfo
 
 	// Formfactor
 	EndpointFormFactor formFactor;
+
+	// Loopback indicator
+	int loopBack;
 }
 PaWasapiDeviceInfo;
 
@@ -1403,6 +1406,8 @@ PaError PaWasapi_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiInd
                 memcpy(&paWasapi->devInfo[i + 1], &paWasapi->devInfo[i], sizeof(*paWasapi->devInfo));
 
                 i++;
+                paWasapi->devInfo[i].loopBack = 1;
+
                 deviceInfo = &deviceInfoArray[i];
 
                 deviceInfo->maxInputChannels		 = deviceInfo->maxOutputChannels;
@@ -1579,6 +1584,29 @@ int PaWasapi_GetDeviceRole( PaDeviceIndex nDevice )
 	return paWasapi->devInfo[ index ].formFactor;
 }
 
+// ------------------------------------------------------------------------------------------
+int PaWasapi_IsLoopback( PaDeviceIndex nDevice )
+{
+	PaError ret;
+	PaDeviceIndex index;
+
+	// Get API
+	PaWasapiHostApiRepresentation *paWasapi = _GetHostApi(&ret);
+	if (paWasapi == NULL)
+		return paNotInitialized;
+
+	// Get device index
+	ret = PaUtil_DeviceIndexToHostApiDeviceIndex(&index, nDevice, &paWasapi->inheritedHostApiRep);
+    if (ret != paNoError)
+        return ret;
+
+	// Validate index
+	if ((UINT32)index >= paWasapi->deviceCount)
+		return paInvalidDevice;
+
+	return paWasapi->devInfo[ index ].loopBack;
+}
+
 // ------------------------------------------------------------------------------------------
 PaError PaWasapi_GetFramesPerHostBuffer( PaStream *pStream, unsigned int *nInput, unsigned int *nOutput )
 {

src/DeviceManager.cpp

@@ -7,6 +7,10 @@
 ******************************************************************/
 
 #include "portaudio.h"
+#ifdef __WXMSW__
+#include "pa_win_wasapi.h"
+#endif
+
 #ifdef USE_PORTMIXER
 #include "portmixer.h"
 #endif
@@ -281,6 +285,10 @@ void DeviceManager::Rescan()
       }
 
       if (info->maxInputChannels > 0) {
+#ifdef __WXMSW__
+         if (Pa_GetHostApiInfo(info->hostApi)->type != paWASAPI ||
+             PaWasapi_IsLoopback(i) > 0)
+#endif
          AddSources(i, info->defaultSampleRate, &mInputDeviceSourceMaps, 1);
       }
    }