Expose the video input signals to the theme, so that they can ask for connection...

diff --git a/theme.cpp b/theme.cpp
index ec791d33b975fe40bc5c48bccc54663bfcc1caf7..9cfcc87b7c10783c87cc36755fc6899e3a023d61 100644 (file)
--- a/theme.cpp
+++ b/theme.cpp
@@ -369,6 +369,14 @@ int VideoInput_change_rate(lua_State* L)
        return 0;
 }
 
+int VideoInput_get_signal_num(lua_State* L)
+{
+       assert(lua_gettop(L) == 1);
+       FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
+       lua_pushnumber(L, -1 - (*video_input)->get_card_index());
+       return 1;
+}
+
 int WhiteBalanceEffect_new(lua_State* L)
 {
        assert(lua_gettop(L) == 0);
@@ -572,6 +580,7 @@ const luaL_Reg VideoInput_funcs[] = {
        { "new", VideoInput_new },
        { "rewind", VideoInput_rewind },
        { "change_rate", VideoInput_change_rate },
+       { "get_signal_num", VideoInput_get_signal_num },
        { NULL, NULL }
 };
 
@@ -1084,6 +1093,11 @@ vector<string> Theme::get_transition_names(float t)
 
 int Theme::map_signal(int signal_num)
 {
+       // Negative numbers map to raw signals.
+       if (signal_num < 0) {
+               return -1 - signal_num;
+       }
+
        unique_lock<mutex> lock(map_m);
        if (signal_to_card_mapping.count(signal_num)) {
                return signal_to_card_mapping[signal_num];