7 #include <movit/effect.h>
8 #include <movit/effect_chain.h>
9 #include <movit/image_format.h>
10 #include <movit/mix_effect.h>
11 #include <movit/overlay_effect.h>
12 #include <movit/padding_effect.h>
13 #include <movit/resample_effect.h>
14 #include <movit/resize_effect.h>
15 #include <movit/white_balance_effect.h>
16 #include <movit/ycbcr.h>
17 #include <movit/ycbcr_input.h>
26 #include "image_input.h"
34 using namespace movit;
36 extern Mixer *global_mixer;
40 // Contains basically the same data as InputState, but does not hold on to
41 // a reference to the frames. This is important so that we can release them
42 // without having to wait for Lua's GC.
43 struct InputStateInfo {
44 InputStateInfo(const InputState& input_state);
46 unsigned last_width[MAX_CARDS], last_height[MAX_CARDS];
49 InputStateInfo::InputStateInfo(const InputState &input_state)
51 for (unsigned signal_num = 0; signal_num < MAX_CARDS; ++signal_num) {
52 BufferedFrame frame = input_state.buffered_frames[signal_num][0];
53 if (frame.frame == nullptr) {
54 last_width[signal_num] = last_height[signal_num] = 0;
57 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
58 last_width[signal_num] = userdata->last_width[frame.field_number];
59 last_height[signal_num] = userdata->last_height[frame.field_number];
63 class LuaRefWithDeleter {
65 LuaRefWithDeleter(mutex *m, lua_State *L, int ref) : m(m), L(L), ref(ref) {}
66 ~LuaRefWithDeleter() {
67 unique_lock<mutex> lock(*m);
68 luaL_unref(L, LUA_REGISTRYINDEX, ref);
70 int get() const { return ref; }
73 LuaRefWithDeleter(const LuaRefWithDeleter &) = delete;
80 template<class T, class... Args>
81 int wrap_lua_object(lua_State* L, const char *class_name, Args&&... args)
83 // Construct the C++ object and put it on the stack.
84 void *mem = lua_newuserdata(L, sizeof(T));
85 new(mem) T(std::forward<Args>(args)...);
87 // Look up the metatable named <class_name>, and set it on the new object.
88 luaL_getmetatable(L, class_name);
89 lua_setmetatable(L, -2);
94 Theme *get_theme_updata(lua_State* L)
96 luaL_checktype(L, lua_upvalueindex(1), LUA_TLIGHTUSERDATA);
97 return (Theme *)lua_touserdata(L, lua_upvalueindex(1));
100 Effect *get_effect(lua_State *L, int idx)
102 if (luaL_testudata(L, idx, "WhiteBalanceEffect") ||
103 luaL_testudata(L, idx, "ResampleEffect") ||
104 luaL_testudata(L, idx, "PaddingEffect") ||
105 luaL_testudata(L, idx, "IntegralPaddingEffect") ||
106 luaL_testudata(L, idx, "OverlayEffect") ||
107 luaL_testudata(L, idx, "ResizeEffect") ||
108 luaL_testudata(L, idx, "MixEffect") ||
109 luaL_testudata(L, idx, "ImageInput")) {
110 return (Effect *)lua_touserdata(L, idx);
112 luaL_error(L, "Error: Index #%d was not an Effect type\n", idx);
116 InputStateInfo *get_input_state_info(lua_State *L, int idx)
118 if (luaL_testudata(L, idx, "InputStateInfo")) {
119 return (InputStateInfo *)lua_touserdata(L, idx);
121 luaL_error(L, "Error: Index #%d was not InputStateInfo\n", idx);
125 bool checkbool(lua_State* L, int idx)
127 luaL_checktype(L, idx, LUA_TBOOLEAN);
128 return lua_toboolean(L, idx);
131 std::string checkstdstring(lua_State *L, int index)
134 const char* cstr = lua_tolstring(L, index, &len);
135 return std::string(cstr, len);
138 int EffectChain_new(lua_State* L)
140 assert(lua_gettop(L) == 2);
141 int aspect_w = luaL_checknumber(L, 1);
142 int aspect_h = luaL_checknumber(L, 2);
144 return wrap_lua_object<EffectChain>(L, "EffectChain", aspect_w, aspect_h);
147 int EffectChain_add_live_input(lua_State* L)
149 assert(lua_gettop(L) == 2);
150 Theme *theme = get_theme_updata(L);
151 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
152 bool override_bounce = checkbool(L, 2);
153 return wrap_lua_object<LiveInputWrapper>(L, "LiveInputWrapper", theme, chain, override_bounce);
156 int EffectChain_add_effect(lua_State* L)
158 assert(lua_gettop(L) >= 2);
159 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
161 // TODO: Better error reporting.
162 Effect *effect = get_effect(L, 2);
163 if (lua_gettop(L) == 2) {
164 if (effect->num_inputs() == 0) {
165 chain->add_input((Input *)effect);
167 chain->add_effect(effect);
170 vector<Effect *> inputs;
171 for (int idx = 3; idx <= lua_gettop(L); ++idx) {
172 if (luaL_testudata(L, idx, "LiveInputWrapper")) {
173 LiveInputWrapper *input = (LiveInputWrapper *)lua_touserdata(L, idx);
174 inputs.push_back(input->get_input());
176 inputs.push_back(get_effect(L, idx));
179 chain->add_effect(effect, inputs);
182 lua_settop(L, 2); // Return the effect itself.
184 // Make sure Lua doesn't garbage-collect it away.
185 lua_pushvalue(L, -1);
186 luaL_ref(L, LUA_REGISTRYINDEX); // TODO: leak?
191 int EffectChain_finalize(lua_State* L)
193 assert(lua_gettop(L) == 2);
194 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
195 bool is_main_chain = checkbool(L, 2);
197 // Add outputs as needed.
198 // NOTE: If you change any details about the output format, you will need to
199 // also update what's given to the muxer (HTTPD::Mux constructor) and
200 // what's put in the H.264 stream (sps_rbsp()).
201 ImageFormat inout_format;
202 inout_format.color_space = COLORSPACE_REC_709;
204 // Output gamma is tricky. We should output Rec. 709 for TV, except that
205 // we expect to run with web players and others that don't really care and
206 // just output with no conversion. So that means we'll need to output sRGB,
207 // even though H.264 has no setting for that (we use “unspecified”).
208 inout_format.gamma_curve = GAMMA_sRGB;
211 YCbCrFormat output_ycbcr_format;
212 // We actually output 4:2:0 in the end, but chroma subsampling
213 // happens in a pass not run by Movit (see Mixer::subsample_chroma()).
214 output_ycbcr_format.chroma_subsampling_x = 1;
215 output_ycbcr_format.chroma_subsampling_y = 1;
217 // Rec. 709 would be the sane thing to do, but it seems many players
218 // (e.g. MPlayer and VLC) just default to BT.601 coefficients no matter
219 // what (see discussions in e.g. https://trac.ffmpeg.org/ticket/4978).
220 // We _do_ set the right flags, though, so that a player that works
221 // properly doesn't have to guess.
222 output_ycbcr_format.luma_coefficients = YCBCR_REC_601;
223 output_ycbcr_format.full_range = false;
224 output_ycbcr_format.num_levels = 256;
226 chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR);
227 chain->set_dither_bits(8);
228 chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
230 chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
236 int LiveInputWrapper_connect_signal(lua_State* L)
238 assert(lua_gettop(L) == 2);
239 LiveInputWrapper *input = (LiveInputWrapper *)luaL_checkudata(L, 1, "LiveInputWrapper");
240 int signal_num = luaL_checknumber(L, 2);
241 input->connect_signal(signal_num);
245 int ImageInput_new(lua_State* L)
247 assert(lua_gettop(L) == 1);
248 std::string filename = checkstdstring(L, 1);
249 return wrap_lua_object<ImageInput>(L, "ImageInput", filename);
252 int WhiteBalanceEffect_new(lua_State* L)
254 assert(lua_gettop(L) == 0);
255 return wrap_lua_object<WhiteBalanceEffect>(L, "WhiteBalanceEffect");
258 int ResampleEffect_new(lua_State* L)
260 assert(lua_gettop(L) == 0);
261 return wrap_lua_object<ResampleEffect>(L, "ResampleEffect");
264 int PaddingEffect_new(lua_State* L)
266 assert(lua_gettop(L) == 0);
267 return wrap_lua_object<PaddingEffect>(L, "PaddingEffect");
270 int IntegralPaddingEffect_new(lua_State* L)
272 assert(lua_gettop(L) == 0);
273 return wrap_lua_object<IntegralPaddingEffect>(L, "IntegralPaddingEffect");
276 int OverlayEffect_new(lua_State* L)
278 assert(lua_gettop(L) == 0);
279 return wrap_lua_object<OverlayEffect>(L, "OverlayEffect");
282 int ResizeEffect_new(lua_State* L)
284 assert(lua_gettop(L) == 0);
285 return wrap_lua_object<ResizeEffect>(L, "ResizeEffect");
288 int MixEffect_new(lua_State* L)
290 assert(lua_gettop(L) == 0);
291 return wrap_lua_object<MixEffect>(L, "MixEffect");
294 int InputStateInfo_get_width(lua_State* L)
296 assert(lua_gettop(L) == 2);
297 InputStateInfo *input_state_info = get_input_state_info(L, 1);
298 Theme *theme = get_theme_updata(L);
299 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
300 lua_pushnumber(L, input_state_info->last_width[signal_num]);
304 int InputStateInfo_get_height(lua_State* L)
306 assert(lua_gettop(L) == 2);
307 InputStateInfo *input_state_info = get_input_state_info(L, 1);
308 Theme *theme = get_theme_updata(L);
309 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
310 lua_pushnumber(L, input_state_info->last_height[signal_num]);
314 int Effect_set_float(lua_State *L)
316 assert(lua_gettop(L) == 3);
317 Effect *effect = (Effect *)get_effect(L, 1);
318 std::string key = checkstdstring(L, 2);
319 float value = luaL_checknumber(L, 3);
320 if (!effect->set_float(key, value)) {
321 luaL_error(L, "Effect refused set_float(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
326 int Effect_set_int(lua_State *L)
328 assert(lua_gettop(L) == 3);
329 Effect *effect = (Effect *)get_effect(L, 1);
330 std::string key = checkstdstring(L, 2);
331 float value = luaL_checknumber(L, 3);
332 if (!effect->set_int(key, value)) {
333 luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
338 int Effect_set_vec3(lua_State *L)
340 assert(lua_gettop(L) == 5);
341 Effect *effect = (Effect *)get_effect(L, 1);
342 std::string key = checkstdstring(L, 2);
344 v[0] = luaL_checknumber(L, 3);
345 v[1] = luaL_checknumber(L, 4);
346 v[2] = luaL_checknumber(L, 5);
347 if (!effect->set_vec3(key, v)) {
348 luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", key.c_str(),
354 int Effect_set_vec4(lua_State *L)
356 assert(lua_gettop(L) == 6);
357 Effect *effect = (Effect *)get_effect(L, 1);
358 std::string key = checkstdstring(L, 2);
360 v[0] = luaL_checknumber(L, 3);
361 v[1] = luaL_checknumber(L, 4);
362 v[2] = luaL_checknumber(L, 5);
363 v[3] = luaL_checknumber(L, 6);
364 if (!effect->set_vec4(key, v)) {
365 luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", key.c_str(),
366 v[0], v[1], v[2], v[3]);
371 const luaL_Reg EffectChain_funcs[] = {
372 { "new", EffectChain_new },
373 { "add_live_input", EffectChain_add_live_input },
374 { "add_effect", EffectChain_add_effect },
375 { "finalize", EffectChain_finalize },
379 const luaL_Reg LiveInputWrapper_funcs[] = {
380 { "connect_signal", LiveInputWrapper_connect_signal },
384 const luaL_Reg ImageInput_funcs[] = {
385 { "new", ImageInput_new },
386 { "set_float", Effect_set_float },
387 { "set_int", Effect_set_int },
388 { "set_vec3", Effect_set_vec3 },
389 { "set_vec4", Effect_set_vec4 },
393 const luaL_Reg WhiteBalanceEffect_funcs[] = {
394 { "new", WhiteBalanceEffect_new },
395 { "set_float", Effect_set_float },
396 { "set_int", Effect_set_int },
397 { "set_vec3", Effect_set_vec3 },
398 { "set_vec4", Effect_set_vec4 },
402 const luaL_Reg ResampleEffect_funcs[] = {
403 { "new", ResampleEffect_new },
404 { "set_float", Effect_set_float },
405 { "set_int", Effect_set_int },
406 { "set_vec3", Effect_set_vec3 },
407 { "set_vec4", Effect_set_vec4 },
411 const luaL_Reg PaddingEffect_funcs[] = {
412 { "new", PaddingEffect_new },
413 { "set_float", Effect_set_float },
414 { "set_int", Effect_set_int },
415 { "set_vec3", Effect_set_vec3 },
416 { "set_vec4", Effect_set_vec4 },
420 const luaL_Reg IntegralPaddingEffect_funcs[] = {
421 { "new", IntegralPaddingEffect_new },
422 { "set_float", Effect_set_float },
423 { "set_int", Effect_set_int },
424 { "set_vec3", Effect_set_vec3 },
425 { "set_vec4", Effect_set_vec4 },
429 const luaL_Reg OverlayEffect_funcs[] = {
430 { "new", OverlayEffect_new },
431 { "set_float", Effect_set_float },
432 { "set_int", Effect_set_int },
433 { "set_vec3", Effect_set_vec3 },
434 { "set_vec4", Effect_set_vec4 },
438 const luaL_Reg ResizeEffect_funcs[] = {
439 { "new", ResizeEffect_new },
440 { "set_float", Effect_set_float },
441 { "set_int", Effect_set_int },
442 { "set_vec3", Effect_set_vec3 },
443 { "set_vec4", Effect_set_vec4 },
447 const luaL_Reg MixEffect_funcs[] = {
448 { "new", MixEffect_new },
449 { "set_float", Effect_set_float },
450 { "set_int", Effect_set_int },
451 { "set_vec3", Effect_set_vec3 },
452 { "set_vec4", Effect_set_vec4 },
456 const luaL_Reg InputStateInfo_funcs[] = {
457 { "get_width", InputStateInfo_get_width },
458 { "get_height", InputStateInfo_get_height },
464 LiveInputWrapper::LiveInputWrapper(Theme *theme, EffectChain *chain, bool override_bounce)
467 ImageFormat inout_format;
468 inout_format.color_space = COLORSPACE_sRGB;
470 // Gamma curve depends on the input signal, and we don't really get any
471 // indications. A camera would be expected to do Rec. 709, but
472 // I haven't checked if any do in practice. However, computers _do_ output
473 // in sRGB gamma (ie., they don't convert from sRGB to Rec. 709), and
474 // I wouldn't really be surprised if most non-professional cameras do, too.
475 // So we pick sRGB as the least evil here.
476 inout_format.gamma_curve = GAMMA_sRGB;
478 // The Blackmagic driver docs claim that the device outputs Y'CbCr
479 // according to Rec. 601, but practical testing indicates it definitely
480 // is Rec. 709 (at least up to errors attributable to rounding errors).
481 // Perhaps 601 was only to indicate the subsampling positions, not the
482 // colorspace itself? Tested with a Lenovo X1 gen 3 as input.
483 YCbCrFormat input_ycbcr_format;
484 input_ycbcr_format.chroma_subsampling_x = 2;
485 input_ycbcr_format.chroma_subsampling_y = 1;
486 input_ycbcr_format.cb_x_position = 0.0;
487 input_ycbcr_format.cr_x_position = 0.0;
488 input_ycbcr_format.cb_y_position = 0.5;
489 input_ycbcr_format.cr_y_position = 0.5;
490 input_ycbcr_format.luma_coefficients = YCBCR_REC_709;
491 input_ycbcr_format.full_range = false;
493 if (override_bounce) {
494 input = new NonBouncingYCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
496 input = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
498 chain->add_input(input);
501 void LiveInputWrapper::connect_signal(int signal_num)
503 if (global_mixer == nullptr) {
508 signal_num = theme->map_signal(signal_num);
510 BufferedFrame frame = theme->input_state->buffered_frames[signal_num][0];
511 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
513 input->set_texture_num(0, userdata->tex_y[frame.field_number]);
514 input->set_texture_num(1, userdata->tex_cbcr[frame.field_number]);
515 input->set_width(userdata->last_width[frame.field_number]);
516 input->set_height(userdata->last_height[frame.field_number]);
519 Theme::Theme(const char *filename, ResourcePool *resource_pool, unsigned num_cards)
520 : resource_pool(resource_pool), num_cards(num_cards)
525 register_class("EffectChain", EffectChain_funcs);
526 register_class("LiveInputWrapper", LiveInputWrapper_funcs);
527 register_class("ImageInput", ImageInput_funcs);
528 register_class("WhiteBalanceEffect", WhiteBalanceEffect_funcs);
529 register_class("ResampleEffect", ResampleEffect_funcs);
530 register_class("PaddingEffect", PaddingEffect_funcs);
531 register_class("IntegralPaddingEffect", IntegralPaddingEffect_funcs);
532 register_class("OverlayEffect", OverlayEffect_funcs);
533 register_class("ResizeEffect", ResizeEffect_funcs);
534 register_class("MixEffect", MixEffect_funcs);
535 register_class("InputStateInfo", InputStateInfo_funcs);
539 if (luaL_dofile(L, filename)) {
540 fprintf(stderr, "error: %s\n", lua_tostring(L, -1));
544 assert(lua_gettop(L) == 0);
546 // Ask it for the number of channels.
547 lua_getglobal(L, "num_channels");
549 if (lua_pcall(L, 0, 1, 0) != 0) {
550 fprintf(stderr, "error running function `num_channels': %s\n", lua_tostring(L, -1));
554 num_channels = luaL_checknumber(L, 1);
556 assert(lua_gettop(L) == 0);
559 void Theme::register_class(const char *class_name, const luaL_Reg *funcs)
561 assert(lua_gettop(L) == 0);
562 luaL_newmetatable(L, class_name); // mt = {}
563 lua_pushlightuserdata(L, this);
564 luaL_setfuncs(L, funcs, 1); // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
565 lua_pushvalue(L, -1);
566 lua_setfield(L, -2, "__index"); // mt.__index = mt
567 lua_setglobal(L, class_name); // ClassName = mt
568 assert(lua_gettop(L) == 0);
571 Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned height, InputState input_state)
575 unique_lock<mutex> lock(m);
576 assert(lua_gettop(L) == 0);
577 lua_getglobal(L, "get_chain"); /* function to be called */
578 lua_pushnumber(L, num);
579 lua_pushnumber(L, t);
580 lua_pushnumber(L, width);
581 lua_pushnumber(L, height);
582 wrap_lua_object<InputStateInfo>(L, "InputStateInfo", input_state);
584 if (lua_pcall(L, 5, 2, 0) != 0) {
585 fprintf(stderr, "error running function `get_chain': %s\n", lua_tostring(L, -1));
589 chain.chain = (EffectChain *)luaL_checkudata(L, -2, "EffectChain");
590 if (!lua_isfunction(L, -1)) {
591 fprintf(stderr, "Argument #-1 should be a function\n");
594 lua_pushvalue(L, -1);
595 shared_ptr<LuaRefWithDeleter> funcref(new LuaRefWithDeleter(&m, L, luaL_ref(L, LUA_REGISTRYINDEX)));
597 assert(lua_gettop(L) == 0);
599 chain.setup_chain = [this, funcref, input_state]{
600 unique_lock<mutex> lock(m);
602 this->input_state = &input_state;
604 // Set up state, including connecting signals.
605 lua_rawgeti(L, LUA_REGISTRYINDEX, funcref->get());
606 if (lua_pcall(L, 0, 0, 0) != 0) {
607 fprintf(stderr, "error running chain setup callback: %s\n", lua_tostring(L, -1));
610 assert(lua_gettop(L) == 0);
613 // TODO: Can we do better, e.g. by running setup_chain() and seeing what it references?
614 // Actually, setup_chain does maybe hold all the references we need now anyway?
615 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
616 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
617 chain.input_frames.push_back(input_state.buffered_frames[card_index][frame_num].frame);
624 std::string Theme::get_channel_name(unsigned channel)
626 unique_lock<mutex> lock(m);
627 lua_getglobal(L, "channel_name");
628 lua_pushnumber(L, channel);
629 if (lua_pcall(L, 1, 1, 0) != 0) {
630 fprintf(stderr, "error running function `channel_nam': %s\n", lua_tostring(L, -1));
634 std::string ret = lua_tostring(L, -1);
636 assert(lua_gettop(L) == 0);
640 bool Theme::get_supports_set_wb(unsigned channel)
642 unique_lock<mutex> lock(m);
643 lua_getglobal(L, "supports_set_wb");
644 lua_pushnumber(L, channel);
645 if (lua_pcall(L, 1, 1, 0) != 0) {
646 fprintf(stderr, "error running function `supports_set_wb': %s\n", lua_tostring(L, -1));
650 bool ret = checkbool(L, -1);
652 assert(lua_gettop(L) == 0);
656 void Theme::set_wb(unsigned channel, double r, double g, double b)
658 unique_lock<mutex> lock(m);
659 lua_getglobal(L, "set_wb");
660 lua_pushnumber(L, channel);
661 lua_pushnumber(L, r);
662 lua_pushnumber(L, g);
663 lua_pushnumber(L, b);
664 if (lua_pcall(L, 4, 0, 0) != 0) {
665 fprintf(stderr, "error running function `set_wb': %s\n", lua_tostring(L, -1));
669 assert(lua_gettop(L) == 0);
672 std::vector<std::string> Theme::get_transition_names(float t)
674 unique_lock<mutex> lock(m);
675 lua_getglobal(L, "get_transitions");
676 lua_pushnumber(L, t);
677 if (lua_pcall(L, 1, 1, 0) != 0) {
678 fprintf(stderr, "error running function `get_transitions': %s\n", lua_tostring(L, -1));
682 std::vector<std::string> ret;
684 while (lua_next(L, -2) != 0) {
685 ret.push_back(lua_tostring(L, -1));
689 assert(lua_gettop(L) == 0);
693 int Theme::map_signal(int signal_num)
695 if (signal_num >= int(num_cards)) {
696 if (signals_warned_about.insert(signal_num).second) {
697 fprintf(stderr, "WARNING: Theme asked for input %d, but we only have %u card(s).\n", signal_num, num_cards);
698 fprintf(stderr, "Mapping to card %d instead.\n", signal_num % num_cards);
700 signal_num %= num_cards;
705 void Theme::transition_clicked(int transition_num, float t)
707 unique_lock<mutex> lock(m);
708 lua_getglobal(L, "transition_clicked");
709 lua_pushnumber(L, transition_num);
710 lua_pushnumber(L, t);
712 if (lua_pcall(L, 2, 0, 0) != 0) {
713 fprintf(stderr, "error running function `transition_clicked': %s\n", lua_tostring(L, -1));
716 assert(lua_gettop(L) == 0);
719 void Theme::channel_clicked(int preview_num)
721 unique_lock<mutex> lock(m);
722 lua_getglobal(L, "channel_clicked");
723 lua_pushnumber(L, preview_num);
725 if (lua_pcall(L, 1, 0, 0) != 0) {
726 fprintf(stderr, "error running function `channel_clicked': %s\n", lua_tostring(L, -1));
729 assert(lua_gettop(L) == 0);