NDI v5 compat

honor the USE_NDI_VERSION

+ notice how to set this to configure.ac

Author: MartinPulec

configure.ac

@@ -3255,7 +3255,8 @@ ENSURE_FEATURE_PRESENT([$cmpto_j2k_req], [$cmpto_j2k], [Comprimato J2K not found
 # ------------------------------------------------------------------------------
 ndi=no
 AC_ARG_ENABLE(ndi,
-      AS_HELP_STRING([--enable-ndi@<:@=ver@:>@], [enables NDI support (default is auto)]),
+      AS_HELP_STRING([--enable-ndi@<:@=ver@:>@], [enables NDI support (default is auto).]
+[Set ver to 5 if using NDI 5.]),
     [ndi_req=$enableval],
     [ndi_req=$build_default]
     )

src/video_capture/ndi.cpp

@@ -623,9 +623,11 @@ static struct video_frame *vidcap_ndi_grab(void *state, struct audio_frame **aud
         case NDIlib_frame_type_status_change:
                 LOG(LOG_LEVEL_NOTICE) << MOD_NAME << "Status changed!\n";
                 break;
+#if USE_NDI_VERSION >= 6
         case NDIlib_frame_type_source_change:
                 LOG(LOG_LEVEL_NOTICE) << MOD_NAME << "Source changed!\n";
                 break;
+#endif
         case NDIlib_frame_type_max:
                 assert(0 && "NDIlib_frame_type_max is invalid!");
         }