modeluid.patch

diff --git a/RtAudio.cpp b/RtAudio.cpp
index 40fb6a9..b0ff46e 100644
--- a/RtAudio.cpp
+++ b/RtAudio.cpp
@@ -726,6 +726,7 @@ RtAudio::DeviceInfo RtApiCore :: getDeviceInfo( unsigned int device )
   CFRelease( cfname );
   free(mname);
 
+  dataSize = sizeof( CFStringRef );
   property.mSelector = kAudioObjectPropertyName;
   result = AudioObjectGetPropertyData( id, &property, 0, NULL, &dataSize, &cfname );
   if ( result != noErr ) {
@@ -747,6 +748,24 @@ RtAudio::DeviceInfo RtApiCore :: getDeviceInfo( unsigned int device )
   CFRelease( cfname );
   free(name);
 
+  dataSize = sizeof( CFStringRef );
+  property.mSelector = kAudioDevicePropertyModelUID;
+  result = AudioObjectGetPropertyData( id, &property, 0, NULL, &dataSize, &cfname );
+  if ( result != noErr )
+    // Instead of returning an error, just use an empty modelUid.
+    cfname = CFSTR("");
+
+  length = CFStringGetLength(cfname);
+  char *modelUid = (char *)malloc(length * 3 + 1);
+#if defined( UNICODE ) || defined( _UNICODE )
+  CFStringGetCString(cfname, modelUid, length * 3 + 1, kCFStringEncodingUTF8);
+#else
+  CFStringGetCString(cfname, modelUid, length * 3 + 1, CFStringGetSystemEncoding());
+#endif
+  info.modelUid = modelUid;
+  CFRelease( cfname );
+  free(modelUid);
+
   // Get the output stream "configuration".
   AudioBufferList	*bufferList = nil;
   property.mSelector = kAudioDevicePropertyStreamConfiguration;
diff --git a/RtAudio.h b/RtAudio.h
index 1aa42e0..96337ad 100644
--- a/RtAudio.h
+++ b/RtAudio.h
@@ -299,6 +299,7 @@ class RTAUDIO_DLL_PUBLIC RtAudio
   struct DeviceInfo {
     bool probed;                  /*!< true if the device capabilities were successfully probed. */
     std::string name;             /*!< Character string device identifier. */
+    std::string modelUid;         /*!< Unique, non-localized, system-independent identifier for this model of device. */
     unsigned int outputChannels{};  /*!< Maximum output channels supported by device. */
     unsigned int inputChannels{};   /*!< Maximum input channels supported by device. */
     unsigned int duplexChannels{};  /*!< Maximum simultaneous input/output channels supported by device. */