Correct use of LV2 UI sample rate

distrho/src/DistrhoUILV2.cpp

@@ -23,6 +23,7 @@
 #include "lv2/data-access.h"
 #include "lv2/instance-access.h"
 #include "lv2/options.h"
+#include "lv2/parameters.h"
 #include "lv2/ui.h"
 #include "lv2/urid.h"
 #include "lv2/lv2_kxstudio_properties.h"
@@ -175,17 +176,17 @@ public:
     {
         for (int i=0; options[i].key != 0; ++i)
         {
-            if (options[i].key == fUridMap->map(fUridMap->handle, LV2_CORE__sampleRate))
+            if (options[i].key == fUridMap->map(fUridMap->handle, LV2_PARAMETERS__sampleRate))
             {
-                if (options[i].type == fUridMap->map(fUridMap->handle, LV2_ATOM__Double))
+                if (options[i].type == fUridMap->map(fUridMap->handle, LV2_ATOM__Float))
                 {
-                    const double sampleRate(*(const double*)options[i].value);
+                    const float sampleRate(*(const float*)options[i].value);
                     fUI.setSampleRate(sampleRate);
                     continue;
                 }
                 else
                 {
-                    d_stderr("Host changed sampleRate but with wrong value type");
+                    d_stderr("Host changed UI sample-rate but with wrong value type");
                     continue;
                 }
             }
@@ -402,23 +403,23 @@ static LV2UI_Handle lv2ui_instantiate(const LV2UI_Descriptor*, const char* uri,
 
     if (options != nullptr)
     {
-        const LV2_URID uridSampleRate(uridMap->map(uridMap->handle, LV2_CORE__sampleRate));
+        const LV2_URID uridSampleRate(uridMap->map(uridMap->handle, LV2_PARAMETERS__sampleRate));
 
         for (int i=0; options[i].key != 0; ++i)
         {
             if (options[i].key == uridSampleRate)
             {
-                if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__Double))
-                    d_lastUiSampleRate = *(const double*)options[i].value;
+                if (options[i].type == uridMap->map(uridMap->handle, LV2_ATOM__Float))
+                    d_lastUiSampleRate = *(const float*)options[i].value;
                 else
-                    d_stderr("Host provides sampleRate but has wrong value type");
+                    d_stderr("Host provides UI sample-rate but has wrong value type");
 
                 break;
             }
         }
     }
 
-    if (d_lastUiSampleRate == 0.0)
+    if (d_lastUiSampleRate < 1.0)
     {
         d_stdout("WARNING: this host does not send sample-rate information for LV2 UIs, using 44100 as fallback (this could be wrong)");
         d_lastUiSampleRate = 44100.0;