Make macOS native audio behave like the others

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/DistrhoUtils.cpp

@@ -31,7 +31,10 @@
 # include <stdlib.h>
 #endif
 
-#if defined(DISTRHO_OS_WINDOWS) && !defined(STATIC_BUILD) && !DISTRHO_IS_STANDALONE
+#ifdef DISTRHO_OS_WINDOWS
+# if DISTRHO_IS_STANDALONE
+constexpr const HINSTANCE hInstance = nullptr;
+# else
 static HINSTANCE hInstance = nullptr;
 
 DISTRHO_PLUGIN_EXPORT
@@ -41,6 +44,7 @@ BOOL WINAPI DllMain(HINSTANCE hInst, DWORD reason, LPVOID)
         hInstance = hInst;
     return 1;
 }
+# endif
 #endif
 
 START_NAMESPACE_DISTRHO
@@ -51,25 +55,22 @@ const char* getBinaryFilename()
 {
     static String filename;
 
-#ifndef STATIC_BUILD
+  #ifndef STATIC_BUILD
     if (filename.isNotEmpty())
         return filename;
 
-# ifdef DISTRHO_OS_WINDOWS
-   #if DISTRHO_IS_STANDALONE
-    constexpr const HINSTANCE hInstance = nullptr;
-   #endif
+   #ifdef DISTRHO_OS_WINDOWS
     CHAR filenameBuf[MAX_PATH];
     filenameBuf[0] = '\0';
     GetModuleFileNameA(hInstance, filenameBuf, sizeof(filenameBuf));
     filename = filenameBuf;
-# else
+   #else
     Dl_info info;
     dladdr((void*)getBinaryFilename, &info);
     char filenameBuf[PATH_MAX];
     filename = realpath(info.dli_fname, filenameBuf);
-# endif
-#endif
+   #endif
+  #endif
 
     return filename;
 }

distrho/src/jackbridge/RtAudioBridge.hpp

@@ -251,11 +251,6 @@ struct RtAudioBridge : NativeBridge {
         return true;
     }
 
-    /* RtAudio in macOS uses a different than usual way to handle audio block size,
-     * where RTAUDIO_MINIMIZE_LATENCY makes CoreAudio use very low latencies (around 15 samples).
-     * As such, dynamic buffer sizes are meaningless there.
-     */
-   #ifndef DISTRHO_OS_MAC
     bool supportsBufferSizeChanges() const override
     {
         return true;
@@ -285,7 +280,6 @@ struct RtAudioBridge : NativeBridge {
         activate();
         return ok;
     }
-   #endif
 
     bool _open(const bool withInput)
     {
@@ -321,7 +315,15 @@ struct RtAudioBridge : NativeBridge {
        #endif
 
         RtAudio::StreamOptions opts;
-        opts.flags = RTAUDIO_NONINTERLEAVED | RTAUDIO_MINIMIZE_LATENCY | RTAUDIO_ALSA_USE_DEFAULT;
+        opts.flags = RTAUDIO_NONINTERLEAVED | RTAUDIO_ALSA_USE_DEFAULT;
+       #ifndef DISTRHO_OS_MAC
+       /* RtAudio in macOS uses a different than usual way to handle audio block size,
+        * where RTAUDIO_MINIMIZE_LATENCY makes CoreAudio use very low latencies (around 15 samples).
+        * That has serious performance drawbacks, so we skip that here.
+        */
+        opts.flags |= RTAUDIO_MINIMIZE_LATENCY;
+       #endif
+        opts.numberOfBuffers = 2;
         opts.streamName = name.buffer();
 
         try {