]> git.sesse.net Git - nageru/blobdiff - nageru/theme.cpp
Collapse all the 10-bit flags.
[nageru] / nageru / theme.cpp
index bf7cdee1e3ceb64f7705f619f1f992c464357b5d..a88c6f61c70034bcf1c104804852b1e5364aaeca 100644 (file)
@@ -29,6 +29,7 @@
 #include <new>
 #include <utility>
 
+#include "audio_mixer.h"
 #include "defs.h"
 #ifdef HAVE_CEF
 #include "cef_capture.h"
@@ -38,6 +39,7 @@
 #include "image_input.h"
 #include "input_state.h"
 #include "lua_utils.h"
+#include "mainwindow.h"
 #include "pbo_frame_allocator.h"
 #include "scene.h"
 
@@ -52,6 +54,9 @@ using namespace movit;
 
 extern Mixer *global_mixer;
 
+constexpr unsigned Theme::MenuEntry::CHECKABLE;
+constexpr unsigned Theme::MenuEntry::CHECKED;
+
 Theme *get_theme_updata(lua_State* L)
 {
        luaL_checktype(L, lua_upvalueindex(1), LUA_TLIGHTUSERDATA);
@@ -97,6 +102,7 @@ InputStateInfo::InputStateInfo(const InputState &input_state)
                last_is_connected[signal_num] = userdata->last_is_connected;
                last_frame_rate_nom[signal_num] = userdata->last_frame_rate_nom;
                last_frame_rate_den[signal_num] = userdata->last_frame_rate_den;
+               last_pixel_format[signal_num] = userdata->pixel_format;
                has_last_subtitle[signal_num] = userdata->has_last_subtitle;
                last_subtitle[signal_num] = userdata->last_subtitle;
        }
@@ -116,6 +122,7 @@ Effect *instantiate_effect(EffectChain *chain, EffectType effect_type)
        case IDENTITY_EFFECT:
                return new IdentityEffect;
        case WHITE_BALANCE_EFFECT:
+       case AUTO_WHITE_BALANCE_EFFECT:
                return new WhiteBalanceEffect;
        case RESAMPLE_EFFECT:
                return new ResampleEffect;
@@ -253,9 +260,9 @@ void add_outputs_and_finalize(EffectChain *chain, bool is_main_chain)
                }
 
                output_ycbcr_format.full_range = false;
-               output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
+               output_ycbcr_format.num_levels = 1 << global_flags.bit_depth;
 
-               GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
+               GLenum type = global_flags.bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 
                chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR, type);
 
@@ -265,7 +272,7 @@ void add_outputs_and_finalize(EffectChain *chain, bool is_main_chain)
                if (global_flags.use_zerocopy) {
                        chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_INTERLEAVED, type);  // Add a copy where we'll only be using the Y component.
                }
-               chain->set_dither_bits(global_flags.x264_bit_depth > 8 ? 16 : 8);
+               chain->set_dither_bits(global_flags.bit_depth > 8 ? 16 : 8);
                chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
        } else {
                chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
@@ -301,7 +308,7 @@ int EffectChain_add_live_input(lua_State* L)
        EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
        bool override_bounce = checkbool(L, 2);
        bool deinterlace = checkbool(L, 3);
-       bmusb::PixelFormat pixel_format = global_flags.ten_bit_input ? bmusb::PixelFormat_10BitYCbCr : bmusb::PixelFormat_8BitYCbCr;
+       bmusb::PixelFormat pixel_format = global_flags.bit_depth > 8 ? bmusb::PixelFormat_10BitYCbCr : bmusb::PixelFormat_8BitYCbCr;
 
        // Needs to be nonowned to match add_video_input (see below).
        return wrap_lua_object_nonowned<LiveInputWrapper>(L, "LiveInputWrapper", theme, chain, pixel_format, override_bounce, deinterlace, /*user_connectable=*/true);
@@ -621,8 +628,8 @@ int InputStateInfo_get_width(lua_State* L)
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
 
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushnumber(L, input_state_info->last_width[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushnumber(L, input_state_info->last_width[card_idx]);
        return 1;
 }
 
@@ -631,8 +638,22 @@ int InputStateInfo_get_height(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushnumber(L, input_state_info->last_height[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushnumber(L, input_state_info->last_height[card_idx]);
+       return 1;
+}
+
+int InputStateInfo_get_frame_height(lua_State* L)
+{
+       assert(lua_gettop(L) == 2);
+       InputStateInfo *input_state_info = get_input_state_info(L, 1);
+       Theme *theme = get_theme_updata(L);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       unsigned height = input_state_info->last_height[card_idx];
+       if (input_state_info->last_interlaced[card_idx]) {
+               height *= 2;
+       }
+       lua_pushnumber(L, height);
        return 1;
 }
 
@@ -641,8 +662,8 @@ int InputStateInfo_get_interlaced(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushboolean(L, input_state_info->last_interlaced[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushboolean(L, input_state_info->last_interlaced[card_idx]);
        return 1;
 }
 
@@ -651,8 +672,8 @@ int InputStateInfo_get_has_signal(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushboolean(L, input_state_info->last_has_signal[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushboolean(L, input_state_info->last_has_signal[card_idx]);
        return 1;
 }
 
@@ -661,8 +682,8 @@ int InputStateInfo_get_is_connected(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushboolean(L, input_state_info->last_is_connected[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushboolean(L, input_state_info->last_is_connected[card_idx]);
        return 1;
 }
 
@@ -671,8 +692,8 @@ int InputStateInfo_get_frame_rate_nom(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushnumber(L, input_state_info->last_frame_rate_nom[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushnumber(L, input_state_info->last_frame_rate_nom[card_idx]);
        return 1;
 }
 
@@ -681,8 +702,8 @@ int InputStateInfo_get_frame_rate_den(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       lua_pushnumber(L, input_state_info->last_frame_rate_den[signal_num]);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       lua_pushnumber(L, input_state_info->last_frame_rate_den[card_idx]);
        return 1;
 }
 
@@ -691,15 +712,78 @@ int InputStateInfo_get_last_subtitle(lua_State* L)
        assert(lua_gettop(L) == 2);
        InputStateInfo *input_state_info = get_input_state_info(L, 1);
        Theme *theme = get_theme_updata(L);
-       int signal_num = theme->map_signal(luaL_checknumber(L, 2));
-       if (!input_state_info->has_last_subtitle[signal_num]) {
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+       if (!input_state_info->has_last_subtitle[card_idx]) {
                lua_pushnil(L);
        } else {
-               lua_pushstring(L, input_state_info->last_subtitle[signal_num].c_str());
+               lua_pushstring(L, input_state_info->last_subtitle[card_idx].c_str());
+       }
+       return 1;
+}
+
+namespace {
+
+// Helper function to write e.g. “60” or “59.94”.
+string format_frame_rate(int nom, int den)
+{
+       char buf[256];
+       if (nom % den == 0) {
+               snprintf(buf, sizeof(buf), "%d", nom / den);
+       } else {
+               snprintf(buf, sizeof(buf), "%.2f", double(nom) / den);
+       }
+       return buf;
+}
+
+// Helper function to write e.g. “720p60”.
+string get_human_readable_resolution(const InputStateInfo *input_state_info, int signal_num)
+{
+       char buf[256];
+       if (input_state_info->last_interlaced[signal_num]) {
+               snprintf(buf, sizeof(buf), "%di", input_state_info->last_height[signal_num] * 2);
+
+               // Show field rate instead of frame rate; really for cosmetics only
+               // (and actually contrary to EBU recommendations, although in line
+               // with typical user expectations).
+               return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num] * 2,
+                       input_state_info->last_frame_rate_den[signal_num]);
+       } else {
+               snprintf(buf, sizeof(buf), "%dp", input_state_info->last_height[signal_num]);
+               return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num],
+                       input_state_info->last_frame_rate_den[signal_num]);
+       }
+}
+
+} // namespace
+
+int InputStateInfo_get_human_readable_resolution(lua_State* L)
+{
+       assert(lua_gettop(L) == 2);
+       InputStateInfo *input_state_info = get_input_state_info(L, 1);
+       Theme *theme = get_theme_updata(L);
+       int card_idx = theme->map_signal_to_card(luaL_checknumber(L, 2));
+
+       string str;
+       if (!input_state_info->last_is_connected[card_idx]) {
+               str = "disconnected";
+       } else if (input_state_info->last_height[card_idx] <= 0) {
+               str = "no signal";
+       } else if (!input_state_info->last_has_signal[card_idx]) {
+               if (input_state_info->last_height[card_idx] == 525) {
+                       // Special mode for the USB3 cards.
+                       str = "no signal";
+               } else {
+                       str = get_human_readable_resolution(input_state_info, card_idx) + ", no signal";
+               }
+       } else {
+               str = get_human_readable_resolution(input_state_info, card_idx);
        }
+
+       lua_pushstring(L, str.c_str());
        return 1;
 }
 
+
 int EffectBlueprint_set_int(lua_State *L)
 {
        assert(lua_gettop(L) == 3);
@@ -783,6 +867,7 @@ const luaL_Reg Scene_funcs[] = {
        { "new", Scene_new },
        { "__gc", Scene_gc },
        { "add_input", Scene::add_input },
+       { "add_white_balance", Scene::add_white_balance },
        { "add_effect", Scene::add_effect },
        { "add_optional_effect", Scene::add_optional_effect },
        { "finalize", Scene::finalize },
@@ -791,9 +876,12 @@ const luaL_Reg Scene_funcs[] = {
 
 const luaL_Reg Block_funcs[] = {
        { "display", Block_display },
-       { "choose_alternative", Block_choose_alternative },
+       { "choose", Block_choose },
        { "enable", Block_enable },
+       { "enable_if", Block_enable_if },
        { "disable", Block_disable },
+       { "always_disable_if_disabled", Block_always_disable_if_disabled },
+       { "promise_to_disable_if_enabled", Block_promise_to_disable_if_enabled },
        { "set_int", Block_set_int },
        { "set_float", Block_set_float },
        { "set_vec3", Block_set_vec3 },
@@ -914,12 +1002,15 @@ const luaL_Reg LiftGammaGainEffect_funcs[] = {
 const luaL_Reg InputStateInfo_funcs[] = {
        { "get_width", InputStateInfo_get_width },
        { "get_height", InputStateInfo_get_height },
+       { "get_frame_width", InputStateInfo_get_width },  // Same as get_width().
+       { "get_frame_height", InputStateInfo_get_frame_height },
        { "get_interlaced", InputStateInfo_get_interlaced },
        { "get_has_signal", InputStateInfo_get_has_signal },
        { "get_is_connected", InputStateInfo_get_is_connected },
        { "get_frame_rate_nom", InputStateInfo_get_frame_rate_nom },
        { "get_frame_rate_den", InputStateInfo_get_frame_rate_den },
        { "get_last_subtitle", InputStateInfo_get_last_subtitle },
+       { "get_human_readable_resolution", InputStateInfo_get_human_readable_resolution },
        { NULL, NULL }
 };
 
@@ -1033,14 +1124,14 @@ bool LiveInputWrapper::connect_signal(int signal_num)
                return true;
        }
 
-       signal_num = theme->map_signal(signal_num);
-       connect_signal_raw(signal_num, *theme->input_state);
+       int card_idx = theme->map_signal_to_card(signal_num);
+       connect_card(card_idx, *theme->input_state);
        return true;
 }
 
-void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &input_state)
+void LiveInputWrapper::connect_card(int card_idx, const InputState &input_state)
 {
-       BufferedFrame first_frame = input_state.buffered_frames[signal_num][0];
+       BufferedFrame first_frame = input_state.buffered_frames[card_idx][0];
        if (first_frame.frame == nullptr) {
                // No data yet.
                return;
@@ -1055,10 +1146,10 @@ void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &inpu
                }
        }
 
-       movit::YCbCrLumaCoefficients ycbcr_coefficients = input_state.ycbcr_coefficients[signal_num];
-       bool full_range = input_state.full_range[signal_num];
+       movit::YCbCrLumaCoefficients ycbcr_coefficients = input_state.ycbcr_coefficients[card_idx];
+       bool full_range = input_state.full_range[card_idx];
 
-       if (input_state.ycbcr_coefficients_auto[signal_num]) {
+       if (input_state.ycbcr_coefficients_auto[card_idx]) {
                full_range = false;
 
                // The Blackmagic driver docs claim that the device outputs Y'CbCr
@@ -1082,7 +1173,7 @@ void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &inpu
 
        BufferedFrame last_good_frame = first_frame;
        for (unsigned i = 0; i < max(ycbcr_inputs.size(), rgba_inputs.size()); ++i) {
-               BufferedFrame frame = input_state.buffered_frames[signal_num][i];
+               BufferedFrame frame = input_state.buffered_frames[card_idx][i];
                if (frame.frame == nullptr) {
                        // Not enough data; reuse last frame (well, field).
                        // This is suboptimal, but we have nothing better.
@@ -1111,7 +1202,14 @@ void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &inpu
                        ycbcr_inputs[i]->set_texture_num(0, userdata->tex_y[frame.field_number]);
                        ycbcr_inputs[i]->set_texture_num(1, userdata->tex_cb[frame.field_number]);
                        ycbcr_inputs[i]->set_texture_num(2, userdata->tex_cr[frame.field_number]);
-                       ycbcr_inputs[i]->change_ycbcr_format(userdata->ycbcr_format);
+                       // YCbCrPlanar is used for video streams, where we can have metadata from the mux.
+                       // Prefer that if there's no override. (Overrides are only available when using
+                       // video as SRT cards.)
+                       if (input_state.ycbcr_coefficients_auto[card_idx]) {
+                               ycbcr_inputs[i]->change_ycbcr_format(userdata->ycbcr_format);
+                       } else {
+                               ycbcr_inputs[i]->change_ycbcr_format(input_ycbcr_format);
+                       }
                        ycbcr_inputs[i]->set_width(width);
                        ycbcr_inputs[i]->set_height(height);
                        break;
@@ -1134,7 +1232,7 @@ void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &inpu
        }
 
        if (deinterlace) {
-               BufferedFrame frame = input_state.buffered_frames[signal_num][0];
+               BufferedFrame frame = input_state.buffered_frames[card_idx][0];
                CHECK(deinterlace_effect->set_int("current_field_position", frame.field_number));
        }
 }
@@ -1147,6 +1245,7 @@ int call_num_channels(lua_State *L)
 
        if (lua_pcall(L, 0, 1, 0) != 0) {
                fprintf(stderr, "error running function `num_channels': %s\n", lua_tostring(L, -1));
+               fprintf(stderr, "Try Nageru.set_num_channels(...) at the start of the script instead.\n");
                abort();
        }
 
@@ -1158,9 +1257,222 @@ int call_num_channels(lua_State *L)
 
 }  // namespace
 
-Theme::Theme(const string &filename, const vector<string> &search_dirs, ResourcePool *resource_pool, unsigned num_cards)
-       : resource_pool(resource_pool), num_cards(num_cards), signal_to_card_mapping(global_flags.default_stream_mapping)
+int Nageru_set_channel_name(lua_State *L)
+{
+       // NOTE: m is already locked.
+       Theme *theme = get_theme_updata(L);
+       unsigned channel = luaL_checknumber(L, 1);
+       const string text = checkstdstring(L, 2);
+       theme->channel_names[channel] = text;
+       lua_pop(L, 2);
+       return 0;
+}
+
+int Nageru_set_num_channels(lua_State *L)
+{
+       // NOTE: m is already locked.
+       Theme *theme = get_theme_updata(L);
+       if (theme->startup_finished) {
+               luaL_error(L, "set_num_channels() can only be called at startup.");
+       }
+       theme->num_channels = luaL_checknumber(L, 1);
+       lua_pop(L, 1);
+       return 0;
+}
+
+int Nageru_set_channel_signal(lua_State *L)
+{
+       // NOTE: m is already locked.
+       Theme *theme = get_theme_updata(L);
+       if (theme->startup_finished) {
+               luaL_error(L, "set_channel_signal() can only be called at startup.");
+       }
+       unsigned channel = luaL_checknumber(L, 1);
+       int signal = luaL_checknumber(L, 2);
+       theme->channel_signals[channel] = signal;
+       lua_pop(L, 2);
+       return 0;
+}
+
+int Nageru_set_supports_wb(lua_State *L)
+{
+       // NOTE: m is already locked.
+       Theme *theme = get_theme_updata(L);
+       if (theme->startup_finished) {
+               luaL_error(L, "set_supports_wb() can only be called at startup.");
+       }
+       unsigned channel = luaL_checknumber(L, 1);
+       bool supports_wb = checkbool(L, 2);
+       theme->channel_supports_wb[channel] = supports_wb;
+       lua_pop(L, 2);
+       return 0;
+}
+
+// NOTE: There's a race condition in all of the audio functions; if the mapping
+// is changed by the user underway, you might not be manipulating the bus you
+// expect. (You should not get crashes, though.) There's not all that much we
+// can do about it, short of locking the entire mixer while anything from the
+// theme runs.
+
+int Nageru_get_num_audio_buses(lua_State *L)
+{
+       if (global_audio_mixer == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+       lua_pushinteger(L, global_audio_mixer->num_buses());
+       return 1;
+}
+
+int Nageru_get_audio_bus_name(lua_State *L)
+{
+       if (global_audio_mixer == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+       int bus_index = luaL_checknumber(L, 1);
+       InputMapping input_mapping = global_audio_mixer->get_input_mapping();
+       if (bus_index < 0 || size_t(bus_index) >= input_mapping.buses.size()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called get_audio_bus_name() on nonexistent bus %d; returning nil.\n", bus_index);
+               lua_pushnil(L);
+       } else {
+               lua_pushstring(L, input_mapping.buses[bus_index].name.c_str());
+       }
+       return 1;
+}
+
+int Nageru_get_audio_bus_fader_level_db(lua_State *L)
+{
+       if (global_audio_mixer == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called get_audio_bus_fader_level_db() on nonexistent bus %d; returning 0.0.\n", bus_index);
+               lua_pushnumber(L, 0.0);
+       } else {
+               lua_pushnumber(L, global_audio_mixer->get_fader_volume(bus_index));
+       }
+       return 1;
+}
+
+int Nageru_set_audio_bus_fader_level_db(lua_State *L)
+{
+       if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called set_audio_bus_fader_level_db() on nonexistent bus %d; ignoring.\n", bus_index);
+               return 0;
+       }
+       double level_db = luaL_checknumber(L, 2);
+
+       // Go through the UI, so that it gets updated.
+       global_mainwindow->set_fader_absolute(bus_index, level_db);
+       return 0;
+}
+
+int Nageru_get_audio_bus_mute(lua_State *L)
+{
+       if (global_audio_mixer == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called get_audio_bus_mute() on nonexistent bus %d; returning false.\n", bus_index);
+               lua_pushboolean(L, false);
+       } else {
+               lua_pushboolean(L, global_audio_mixer->get_mute(bus_index));
+       }
+       return 1;
+}
+
+int Nageru_set_audio_bus_mute(lua_State *L)
+{
+       if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called set_audio_bus_mute() on nonexistent bus %d; ignoring.\n", bus_index);
+               return 0;
+       }
+       bool mute = checkbool(L, 2);
+
+       // Go through the UI, so that it gets updated.
+       if (mute != global_audio_mixer->get_mute(bus_index)) {
+               global_mainwindow->toggle_mute(bus_index);
+       }
+       return 0;
+}
+
+int Nageru_get_audio_bus_eq_level_db(lua_State *L)
+{
+       if (global_audio_mixer == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       int band = luaL_checknumber(L, 2);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called get_audio_bus_eq_level_db() on nonexistent bus %d; returning 0.0.\n", bus_index);
+               lua_pushnumber(L, 0.0);
+       } else if (band != EQ_BAND_BASS && band != EQ_BAND_MID && band != EQ_BAND_TREBLE) {
+               print_warning(L, "Theme called get_audio_bus_eq_level_db() on nonexistent band; returning 0.0.\n", bus_index);
+               lua_pushnumber(L, 0.0);
+       } else {
+               lua_pushnumber(L, global_audio_mixer->get_eq(bus_index, EQBand(band)));
+       }
+       return 1;
+}
+
+int Nageru_set_audio_bus_eq_level_db(lua_State *L)
+{
+       if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
+               // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
+               luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
+       }
+
+       int bus_index = luaL_checknumber(L, 1);
+       int band = luaL_checknumber(L, 2);
+       if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
+               // Doesn't fix the race, but fixes other out-of-bounds.
+               print_warning(L, "Theme called set_audio_bus_eq_level_db() on nonexistent bus %d; ignoring.\n", bus_index);
+               return 0;
+       } else if (band != EQ_BAND_BASS && band != EQ_BAND_MID && band != EQ_BAND_TREBLE) {
+               print_warning(L, "Theme called set_audio_bus_eq_level_db() on nonexistent band; returning 0.0.\n", bus_index);
+               return 0;
+       }
+       double level_db = luaL_checknumber(L, 3);
+
+       // Go through the UI, so that it gets updated.
+       global_mainwindow->set_eq_absolute(bus_index, EQBand(band), level_db);
+       return 0;
+}
+
+Theme::Theme(const string &filename, const vector<string> &search_dirs, ResourcePool *resource_pool)
+       : resource_pool(resource_pool), signal_to_card_mapping(global_flags.default_stream_mapping)
 {
+       // Defaults.
+       channel_names[0] = "Live";
+       channel_names[1] = "Preview";
+
        L = luaL_newstate();
         luaL_openlibs(L);
 
@@ -1228,7 +1540,7 @@ Theme::Theme(const string &filename, const vector<string> &search_dirs, Resource
        }
 
        // Set up the API we provide.
-       register_constants();
+       register_globals();
        register_class("Scene", Scene_funcs);
        register_class("Block", Block_funcs);
        register_class("EffectBlueprint", EffectBlueprint_funcs);
@@ -1259,21 +1571,30 @@ Theme::Theme(const string &filename, const vector<string> &search_dirs, Resource
        }
        assert(lua_gettop(L) == 0);
 
-       // Ask it for the number of channels.
-       num_channels = call_num_channels(L);
+       if (num_channels == -1) {
+               // Ask it for the number of channels.
+               num_channels = call_num_channels(L);
+       }
+       startup_finished = true;
 }
 
 Theme::~Theme()
 {
+       theme_menu.reset();
        lua_close(L);
 }
 
-void Theme::register_constants()
+void Theme::register_globals()
 {
        // Set Nageru.VIDEO_FORMAT_BGRA = bmusb::PixelFormat_8BitBGRA, etc.
        const vector<pair<string, int>> num_constants = {
                { "VIDEO_FORMAT_BGRA", bmusb::PixelFormat_8BitBGRA },
                { "VIDEO_FORMAT_YCBCR", bmusb::PixelFormat_8BitYCbCrPlanar },
+               { "CHECKABLE", MenuEntry::CHECKABLE },
+               { "CHECKED", MenuEntry::CHECKED },
+               { "EQ_BAND_BASS", EQ_BAND_BASS },
+               { "EQ_BAND_MID", EQ_BAND_MID },
+               { "EQ_BAND_TREBLE", EQ_BAND_TREBLE },
        };
        const vector<pair<string, string>> str_constants = {
                { "THEME_PATH", theme_path },
@@ -1292,6 +1613,28 @@ void Theme::register_constants()
                lua_settable(L, 1);  // t[key] = value
        }
 
+       const luaL_Reg Nageru_funcs[] = {
+               // Channel information.
+               { "set_channel_name", Nageru_set_channel_name },
+               { "set_num_channels", Nageru_set_num_channels },
+               { "set_channel_signal", Nageru_set_channel_signal },
+               { "set_supports_wb", Nageru_set_supports_wb },
+
+               // Audio.
+               { "get_num_audio_buses", Nageru_get_num_audio_buses },
+               { "get_audio_bus_name", Nageru_get_audio_bus_name },
+               { "get_audio_bus_fader_level_db", Nageru_get_audio_bus_fader_level_db },
+               { "set_audio_bus_fader_level_db", Nageru_set_audio_bus_fader_level_db },
+               { "get_audio_bus_eq_level_db", Nageru_get_audio_bus_eq_level_db },
+               { "set_audio_bus_eq_level_db", Nageru_set_audio_bus_eq_level_db },
+               { "get_audio_bus_mute", Nageru_get_audio_bus_mute },
+               { "set_audio_bus_mute", Nageru_set_audio_bus_mute },
+
+               { nullptr, nullptr }
+       };
+       lua_pushlightuserdata(L, this);
+       luaL_setfuncs(L, Nageru_funcs, 1);        // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
+
        lua_setglobal(L, "Nageru");  // Nageru = t
        assert(lua_gettop(L) == 0);
 }
@@ -1342,13 +1685,13 @@ Theme::Chain Theme::get_chain_from_effect_chain(EffectChain *effect_chain, unsig
                // each FFmpeg or CEF input, so we'll do it here.
                if (video_signal_connections.count(effect_chain)) {
                        for (const VideoSignalConnection &conn : video_signal_connections[effect_chain]) {
-                               conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
+                               conn.wrapper->connect_card(conn.source->get_card_index(), input_state);
                        }
                }
 #ifdef HAVE_CEF
                if (html_signal_connections.count(effect_chain)) {
                        for (const CEFSignalConnection &conn : html_signal_connections[effect_chain]) {
-                               conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
+                               conn.wrapper->connect_card(conn.source->get_card_index(), input_state);
                        }
                }
 #endif
@@ -1405,8 +1748,8 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
 
        // TODO: Can we do better, e.g. by running setup_chain() and seeing what it references?
        // Actually, setup_chain does maybe hold all the references we need now anyway?
-       chain.input_frames.reserve(num_cards * FRAME_HISTORY_LENGTH);
-       for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
+       chain.input_frames.reserve(MAX_VIDEO_CARDS * FRAME_HISTORY_LENGTH);
+       for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
                for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
                        chain.input_frames.push_back(input_state.buffered_frames[card_index][frame_num].frame);
                }
@@ -1418,7 +1761,23 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
 string Theme::get_channel_name(unsigned channel)
 {
        lock_guard<mutex> lock(m);
+
+       // We never ask the legacy channel_name() about live and preview.
+       // The defaults are set in our constructor.
+       if (channel == 0 || channel == 1) {
+               return channel_names[channel];
+       }
+
        lua_getglobal(L, "channel_name");
+       if (lua_isnil(L, -1)) {
+               lua_pop(L, 1);
+               if (channel_names.count(channel)) {
+                       return channel_names[channel];
+               } else {
+                       return "(no title)";
+               }
+       }
+
        lua_pushnumber(L, channel);
        if (lua_pcall(L, 1, 1, 0) != 0) {
                fprintf(stderr, "error running function `channel_name': %s\n", lua_tostring(L, -1));
@@ -1427,6 +1786,7 @@ string Theme::get_channel_name(unsigned channel)
        const char *ret = lua_tostring(L, -1);
        if (ret == nullptr) {
                fprintf(stderr, "function `channel_name' returned nil for channel %d\n", channel);
+               fprintf(stderr, "Try Nageru.set_channel_name(channel, name) at the start of the script instead.\n");
                abort();
        }
 
@@ -1436,13 +1796,23 @@ string Theme::get_channel_name(unsigned channel)
        return retstr;
 }
 
-int Theme::get_channel_signal(unsigned channel)
+int Theme::map_channel_to_signal(unsigned channel)
 {
        lock_guard<mutex> lock(m);
        lua_getglobal(L, "channel_signal");
+       if (lua_isnil(L, -1)) {
+               lua_pop(L, 1);
+               if (channel_signals.count(channel)) {
+                       return channel_signals[channel];
+               } else {
+                       return -1;
+               }
+       }
+
        lua_pushnumber(L, channel);
        if (lua_pcall(L, 1, 1, 0) != 0) {
                fprintf(stderr, "error running function `channel_signal': %s\n", lua_tostring(L, -1));
+               fprintf(stderr, "Try Nageru.set_channel_signal(channel, signal) at the start of the script instead.\n");
                abort();
        }
 
@@ -1478,9 +1848,19 @@ bool Theme::get_supports_set_wb(unsigned channel)
 {
        lock_guard<mutex> lock(m);
        lua_getglobal(L, "supports_set_wb");
+       if (lua_isnil(L, -1)) {
+               lua_pop(L, 1);
+               if (channel_supports_wb.count(channel)) {
+                       return channel_supports_wb[channel];
+               } else {
+                       return false;
+               }
+       }
+
        lua_pushnumber(L, channel);
        if (lua_pcall(L, 1, 1, 0) != 0) {
                fprintf(stderr, "error running function `supports_set_wb': %s\n", lua_tostring(L, -1));
+               fprintf(stderr, "Try Nageru.set_supports_wb(channel, bool) at the start of the script instead.\n");
                abort();
        }
 
@@ -1490,10 +1870,40 @@ bool Theme::get_supports_set_wb(unsigned channel)
        return ret;
 }
 
-void Theme::set_wb(unsigned channel, double r, double g, double b)
+void Theme::set_wb(unsigned channel, float r, float g, float b)
 {
+       int signal = map_channel_to_signal(channel);
+
        lock_guard<mutex> lock(m);
+       if (signal != -1) {
+               int card_idx = map_signal_to_card(signal);
+               white_balance_for_card[card_idx] = RGBTriplet{ r, g, b };
+       }
+
+       call_lua_wb_callback(channel, r, g, b);
+}
+
+void Theme::set_wb_for_card(int card_idx, float r, float g, float b)
+{
+       lock_guard<mutex> lock(m);
+       white_balance_for_card[card_idx] = RGBTriplet{ r, g, b };
+
+       for (const auto &channel_and_signal : channel_signals) {
+               if (map_signal_to_card(channel_and_signal.second) == card_idx) {
+                       call_lua_wb_callback(channel_and_signal.first, r, g, b);
+               }
+       }
+}
+
+void Theme::call_lua_wb_callback(unsigned channel, float r, float g, float b)
+{
        lua_getglobal(L, "set_wb");
+       if (lua_isnil(L, -1)) {
+               // The function doesn't exist, to just ignore. We've stored the white balance,
+               // and most likely, it will be picked up by auto white balance instead.
+               lua_pop(L, 1);
+               return;
+       }
        lua_pushnumber(L, channel);
        lua_pushnumber(L, r);
        lua_pushnumber(L, g);
@@ -1506,6 +1916,15 @@ void Theme::set_wb(unsigned channel, double r, double g, double b)
        assert(lua_gettop(L) == 0);
 }
 
+RGBTriplet Theme::get_white_balance_for_card(int card_idx)
+{
+       if (white_balance_for_card.count(card_idx)) {
+               return white_balance_for_card[card_idx];
+       } else {
+               return RGBTriplet{ 1.0, 1.0, 1.0 };
+       }
+}
+
 vector<string> Theme::get_transition_names(float t)
 {
        lock_guard<mutex> lock(m);
@@ -1527,7 +1946,7 @@ vector<string> Theme::get_transition_names(float t)
        return ret;
 }
 
-int Theme::map_signal(int signal_num)
+int Theme::map_signal_to_card(int signal_num)
 {
        // Negative numbers map to raw signals.
        if (signal_num < 0) {
@@ -1540,33 +1959,34 @@ int Theme::map_signal(int signal_num)
        }
 
        int card_index;
-       if (global_flags.output_card != -1 && num_cards > 1) {
+       if (global_flags.output_card != -1) {
                // Try to exclude the output card from the default card_index.
-               card_index = signal_num % (num_cards - 1);
+               card_index = signal_num % (global_flags.max_num_cards - 1);
                if (card_index >= global_flags.output_card) {
                         ++card_index;
                }
-               if (signal_num >= int(num_cards - 1)) {
+               if (signal_num >= int(global_flags.max_num_cards - 1)) {
                        print_warning(L, "Theme asked for input %d, but we only have %u input card(s) (card %d is busy with output).\n",
-                               signal_num, num_cards - 1, global_flags.output_card);
+                               signal_num, global_flags.max_num_cards - 1, global_flags.output_card);
                        fprintf(stderr, "Mapping to card %d instead.\n", card_index);
                }
        } else {
-               card_index = signal_num % num_cards;
-               if (signal_num >= int(num_cards)) {
-                       print_warning(L, "Theme asked for input %d, but we only have %u card(s).\n", signal_num, num_cards);
+               card_index = signal_num % global_flags.max_num_cards;
+               if (signal_num >= int(global_flags.max_num_cards)) {
+                       print_warning(L, "Theme asked for input %d, but we only have %u card(s).\n", signal_num, global_flags.max_num_cards);
                        fprintf(stderr, "Mapping to card %d instead.\n", card_index);
                }
        }
+       global_mixer->force_card_active(card_index);
        signal_to_card_mapping[signal_num] = card_index;
        return card_index;
 }
 
-void Theme::set_signal_mapping(int signal_num, int card_num)
+void Theme::set_signal_mapping(int signal_num, int card_idx)
 {
        lock_guard<mutex> lock(map_m);
-       assert(card_num < int(num_cards));
-       signal_to_card_mapping[signal_num] = card_num;
+       assert(card_idx < MAX_VIDEO_CARDS);
+       signal_to_card_mapping[signal_num] = card_idx;
 }
 
 void Theme::transition_clicked(int transition_num, float t)
@@ -1596,25 +2016,78 @@ void Theme::channel_clicked(int preview_num)
        assert(lua_gettop(L) == 0);
 }
 
-int Theme::set_theme_menu(lua_State *L)
+template <class T>
+void destroy(T &ref)
 {
-       for (const Theme::MenuEntry &entry : theme_menu) {
-               luaL_unref(L, LUA_REGISTRYINDEX, entry.lua_ref);
+       ref.~T();
+}
+
+Theme::MenuEntry::~MenuEntry()
+{
+       if (is_submenu) {
+               destroy(submenu);
+       } else {
+               luaL_unref(entry.L, LUA_REGISTRYINDEX, entry.lua_ref);
        }
-       theme_menu.clear();
+}
 
-       int num_elements = lua_gettop(L);
-       for (int i = 1; i <= num_elements; ++i) {
-               lua_rawgeti(L, i, 1);
-               const string text = checkstdstring(L, -1);
+namespace {
+
+vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L);
+
+unique_ptr<Theme::MenuEntry> create_theme_menu_entry(lua_State *L, int index)
+{
+       unique_ptr<Theme::MenuEntry> entry;
+
+       lua_rawgeti(L, index, 1);
+       const string text = checkstdstring(L, -1);
+       lua_pop(L, 1);
+
+       unsigned flags = 0;
+       if (lua_objlen(L, -1) > 2) {
+               lua_rawgeti(L, -1, 3);
+               flags = luaL_checknumber(L, -1);
                lua_pop(L, 1);
+       }
 
-               lua_rawgeti(L, i, 2);
+       lua_rawgeti(L, index, 2);
+       if (lua_istable(L, -1)) {
+               vector<unique_ptr<Theme::MenuEntry>> submenu = create_recursive_theme_menu(L);
+               entry.reset(new Theme::MenuEntry{ text, move(submenu) });
+               lua_pop(L, 1);
+       } else {
                luaL_checktype(L, -1, LUA_TFUNCTION);
                int ref = luaL_ref(L, LUA_REGISTRYINDEX);
+               entry.reset(new Theme::MenuEntry{ text, L, ref, flags });
+       }
+       return entry;
+}
 
-               theme_menu.push_back(MenuEntry{ text, ref });
+vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L)
+{
+       vector<unique_ptr<Theme::MenuEntry>> menu;
+       size_t num_elements = lua_objlen(L, -1);
+       for (size_t i = 1; i <= num_elements; ++i) {
+               lua_rawgeti(L, -1, i);
+               menu.emplace_back(create_theme_menu_entry(L, -1));
+               lua_pop(L, 1);
        }
+       return menu;
+}
+
+}  // namespace
+
+int Theme::set_theme_menu(lua_State *L)
+{
+       theme_menu.reset();
+
+       vector<unique_ptr<MenuEntry>> root_menu;
+       int num_elements = lua_gettop(L);
+       for (int i = 1; i <= num_elements; ++i) {
+               root_menu.emplace_back(create_theme_menu_entry(L, i));
+       }
+       theme_menu.reset(new MenuEntry("", move(root_menu)));
+
        lua_pop(L, num_elements);
        assert(lua_gettop(L) == 0);
 
@@ -1634,3 +2107,36 @@ void Theme::theme_menu_entry_clicked(int lua_ref)
                abort();
        }
 }
+
+string Theme::format_status_line(const string &disk_space_left_text, double file_length_seconds)
+{
+       lock_guard<mutex> lock(m);
+       lua_getglobal(L, "format_status_line");
+       if (lua_isnil(L, -1)) {
+               lua_pop(L, 1);
+               return disk_space_left_text;
+       }
+
+       lua_pushstring(L, disk_space_left_text.c_str());
+       lua_pushnumber(L, file_length_seconds);
+       if (lua_pcall(L, 2, 1, 0) != 0) {
+               fprintf(stderr, "error running function format_status_line(): %s\n", lua_tostring(L, -1));
+               abort();
+       }
+       string text = checkstdstring(L, 1);
+       lua_pop(L, 1);
+       assert(lua_gettop(L) == 0);
+       return text;
+}
+
+void Theme::remove_card(unsigned card_index)
+{
+       lock_guard<mutex> lock(map_m);
+       for (auto it = signal_to_card_mapping.begin(); it != signal_to_card_mapping.end(); ) {
+               if (it->second == int(card_index)) {
+                       it = signal_to_card_mapping.erase(it);
+               } else {
+                       ++it;
+               }
+       }
+}