dep/cubeb: Add cubeb_get_backend_names()

dep/cubeb/include/cubeb/cubeb.h

@@ -469,6 +469,11 @@ CUBEB_EXPORT int
 cubeb_init(cubeb ** context, char const * context_name,
            char const * backend_name);
 
+/** Returns a list of backend names which can be supplid to cubeb_init().
+    Array is null-terminated. */
+CUBEB_EXPORT const char**
+cubeb_get_backend_names();
+
 /** Get a read-only string identifying this context's current backend.
     @param context A pointer to the cubeb context.
     @retval Read-only string identifying current backend. */

dep/cubeb/src/cubeb.c

@@ -290,6 +290,61 @@ cubeb_init(cubeb ** context, char const * context_name,
   return CUBEB_ERROR;
 }
 
+const char**
+cubeb_get_backend_names()
+{
+  static const char* backend_names[] = {
+#if defined(USE_PULSE)
+    "pulse",
+#endif
+#if defined(USE_PULSE_RUST)
+    "pulse-rust",
+#endif
+#if defined(USE_JACK)
+    "jack",
+#endif
+#if defined(USE_ALSA)
+    "alsa",
+#endif
+#if defined(USE_AUDIOUNIT)
+    "audiounit",
+#endif
+#if defined(USE_AUDIOUNIT_RUST)
+    "audiounit-rust",
+#endif
+#if defined(USE_WASAPI)
+    "wasapi",
+#endif
+#if defined(USE_WINMM)
+    "winmm",
+#endif
+#if defined(USE_SNDIO)
+    "sndio",
+#endif
+#if defined(USE_SUN)
+    "sun",
+#endif
+#if defined(USE_OPENSL)
+    "opensl",
+#endif
+#if defined(USE_OSS)
+    "oss",
+#endif
+#if defined(USE_AAUDIO)
+    "aaudio",
+#endif
+#if defined(USE_AUDIOTRACK)
+    "audiotrack",
+#endif
+#if defined(USE_KAI)
+    "kai",
+#endif
+    NULL,
+  };
+
+  return backend_names;
+}
+
 char const *
 cubeb_get_backend_id(cubeb * context)
 {