+#ifdef _WIN32
+static char *dup_wchar_to_utf8(wchar_t *w)
+{
+ char *s = NULL;
+ int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
+ s = (char *) av_malloc(l);
+ if (s)
+ WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
+ return s;
+}
+#define DECKLINK_STR OLECHAR *
+#define DECKLINK_STRDUP dup_wchar_to_utf8
+#define DECKLINK_FREE(s) SysFreeString(s)
+#elif defined(__APPLE__)
+static char *dup_cfstring_to_utf8(CFStringRef w)
+{
+ char s[256];
+ CFStringGetCString(w, s, 255, kCFStringEncodingUTF8);
+ return av_strdup(s);
+}
+#define DECKLINK_STR const __CFString *
+#define DECKLINK_STRDUP dup_cfstring_to_utf8
+#define DECKLINK_FREE(s) CFRelease(s)
+#else
+#define DECKLINK_STR const char *
+#define DECKLINK_STRDUP av_strdup
+/* free() is needed for a string returned by the DeckLink SDL. */
+#define DECKLINK_FREE(s) free((void *) s)
+#endif
+