4 #include <bmusb/bmusb.h>
9 #include <movit/deinterlace_effect.h>
10 #include <movit/effect.h>
11 #include <movit/effect_chain.h>
12 #include <movit/image_format.h>
13 #include <movit/input.h>
14 #include <movit/lift_gamma_gain_effect.h>
15 #include <movit/mix_effect.h>
16 #include <movit/multiply_effect.h>
17 #include <movit/overlay_effect.h>
18 #include <movit/padding_effect.h>
19 #include <movit/resample_effect.h>
20 #include <movit/resize_effect.h>
21 #include <movit/util.h>
22 #include <movit/white_balance_effect.h>
23 #include <movit/ycbcr.h>
24 #include <movit/ycbcr_input.h>
32 #include "audio_mixer.h"
35 #include "cef_capture.h"
37 #include "ffmpeg_capture.h"
39 #include "image_input.h"
40 #include "input_state.h"
41 #include "lua_utils.h"
42 #include "mainwindow.h"
43 #include "pbo_frame_allocator.h"
53 using namespace movit;
55 extern Mixer *global_mixer;
57 constexpr unsigned Theme::MenuEntry::CHECKABLE;
58 constexpr unsigned Theme::MenuEntry::CHECKED;
60 Theme *get_theme_updata(lua_State* L)
62 luaL_checktype(L, lua_upvalueindex(1), LUA_TLIGHTUSERDATA);
63 return (Theme *)lua_touserdata(L, lua_upvalueindex(1));
66 void print_warning(lua_State* L, const char *format, ...)
71 vsnprintf(buf, sizeof(buf), format, ap);
75 lua_getstack(L, 1, &ar);
76 lua_getinfo(L, "nSl", &ar);
77 fprintf(stderr, "WARNING: %s:%d: %s", ar.source, ar.currentline, buf);
80 int ThemeMenu_set(lua_State *L)
82 Theme *theme = get_theme_updata(L);
83 return theme->set_theme_menu(L);
86 InputStateInfo::InputStateInfo(const InputState &input_state)
88 for (unsigned signal_num = 0; signal_num < MAX_VIDEO_CARDS; ++signal_num) {
89 BufferedFrame frame = input_state.buffered_frames[signal_num][0];
90 if (frame.frame == nullptr) {
91 last_width[signal_num] = last_height[signal_num] = 0;
92 last_interlaced[signal_num] = false;
93 last_has_signal[signal_num] = false;
94 last_is_connected[signal_num] = false;
97 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
98 last_width[signal_num] = userdata->last_width[frame.field_number];
99 last_height[signal_num] = userdata->last_height[frame.field_number];
100 last_interlaced[signal_num] = userdata->last_interlaced;
101 last_has_signal[signal_num] = userdata->last_has_signal;
102 last_is_connected[signal_num] = userdata->last_is_connected;
103 last_frame_rate_nom[signal_num] = userdata->last_frame_rate_nom;
104 last_frame_rate_den[signal_num] = userdata->last_frame_rate_den;
105 has_last_subtitle[signal_num] = userdata->has_last_subtitle;
106 last_subtitle[signal_num] = userdata->last_subtitle;
110 // An effect that does nothing.
111 class IdentityEffect : public Effect {
114 string effect_type_id() const override { return "IdentityEffect"; }
115 string output_fragment_shader() override { return read_file("identity.frag"); }
118 Effect *instantiate_effect(EffectChain *chain, EffectType effect_type)
120 switch (effect_type) {
121 case IDENTITY_EFFECT:
122 return new IdentityEffect;
123 case WHITE_BALANCE_EFFECT:
124 case AUTO_WHITE_BALANCE_EFFECT:
125 return new WhiteBalanceEffect;
126 case RESAMPLE_EFFECT:
127 return new ResampleEffect;
129 return new PaddingEffect;
130 case INTEGRAL_PADDING_EFFECT:
131 return new IntegralPaddingEffect;
133 return new OverlayEffect;
135 return new ResizeEffect;
136 case MULTIPLY_EFFECT:
137 return new MultiplyEffect;
139 return new MixEffect;
140 case LIFT_GAMMA_GAIN_EFFECT:
141 return new LiftGammaGainEffect;
143 fprintf(stderr, "Unhandled effect type %d\n", effect_type);
150 Effect *get_effect_from_blueprint(EffectChain *chain, lua_State *L, int idx)
152 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, idx, "EffectBlueprint");
153 if (blueprint->effect != nullptr) {
154 luaL_error(L, "An effect can currently only be added to one chain.\n");
157 Effect *effect = instantiate_effect(chain, blueprint->effect_type);
159 // Set the parameters that were deferred earlier.
160 for (const auto &kv : blueprint->int_parameters) {
161 if (!effect->set_int(kv.first, kv.second)) {
162 luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", kv.first.c_str(), kv.second);
165 for (const auto &kv : blueprint->float_parameters) {
166 if (!effect->set_float(kv.first, kv.second)) {
167 luaL_error(L, "Effect refused set_float(\"%s\", %f) (invalid key?)", kv.first.c_str(), kv.second);
170 for (const auto &kv : blueprint->vec3_parameters) {
171 if (!effect->set_vec3(kv.first, kv.second.data())) {
172 luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", kv.first.c_str(),
173 kv.second[0], kv.second[1], kv.second[2]);
176 for (const auto &kv : blueprint->vec4_parameters) {
177 if (!effect->set_vec4(kv.first, kv.second.data())) {
178 luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", kv.first.c_str(),
179 kv.second[0], kv.second[1], kv.second[2], kv.second[3]);
182 blueprint->effect = effect;
186 InputStateInfo *get_input_state_info(lua_State *L, int idx)
188 if (luaL_testudata(L, idx, "InputStateInfo")) {
189 return (InputStateInfo *)lua_touserdata(L, idx);
191 luaL_error(L, "Error: Index #%d was not InputStateInfo\n", idx);
197 bool checkbool(lua_State* L, int idx)
199 luaL_checktype(L, idx, LUA_TBOOLEAN);
200 return lua_toboolean(L, idx);
203 string checkstdstring(lua_State *L, int index)
206 const char* cstr = lua_tolstring(L, index, &len);
207 return string(cstr, len);
212 int Scene_new(lua_State* L)
214 assert(lua_gettop(L) == 2);
215 Theme *theme = get_theme_updata(L);
216 int aspect_w = luaL_checknumber(L, 1);
217 int aspect_h = luaL_checknumber(L, 2);
219 return wrap_lua_object<Scene>(L, "Scene", theme, aspect_w, aspect_h);
222 int Scene_gc(lua_State* L)
224 assert(lua_gettop(L) == 1);
225 Scene *chain = (Scene *)luaL_checkudata(L, 1, "Scene");
232 void add_outputs_and_finalize(EffectChain *chain, bool is_main_chain)
234 // Add outputs as needed.
235 // NOTE: If you change any details about the output format, you will need to
236 // also update what's given to the muxer (HTTPD::Mux constructor) and
237 // what's put in the H.264 stream (sps_rbsp()).
238 ImageFormat inout_format;
239 inout_format.color_space = COLORSPACE_REC_709;
241 // Output gamma is tricky. We should output Rec. 709 for TV, except that
242 // we expect to run with web players and others that don't really care and
243 // just output with no conversion. So that means we'll need to output sRGB,
244 // even though H.264 has no setting for that (we use “unspecified”).
245 inout_format.gamma_curve = GAMMA_sRGB;
248 YCbCrFormat output_ycbcr_format;
249 // We actually output 4:2:0 and/or 4:2:2 in the end, but chroma subsampling
250 // happens in a pass not run by Movit (see ChromaSubsampler::subsample_chroma()).
251 output_ycbcr_format.chroma_subsampling_x = 1;
252 output_ycbcr_format.chroma_subsampling_y = 1;
254 // This will be overridden if HDMI/SDI output is in force.
255 if (global_flags.ycbcr_rec709_coefficients) {
256 output_ycbcr_format.luma_coefficients = YCBCR_REC_709;
258 output_ycbcr_format.luma_coefficients = YCBCR_REC_601;
261 output_ycbcr_format.full_range = false;
262 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
264 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
266 chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR, type);
268 // If we're using zerocopy video encoding (so the destination
269 // Y texture is owned by VA-API and will be unavailable for
270 // display), add a copy, where we'll only be using the Y component.
271 if (global_flags.use_zerocopy) {
272 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.
274 chain->set_dither_bits(global_flags.x264_bit_depth > 8 ? 16 : 8);
275 chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
277 chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
285 int EffectChain_new(lua_State* L)
287 assert(lua_gettop(L) == 2);
288 Theme *theme = get_theme_updata(L);
289 int aspect_w = luaL_checknumber(L, 1);
290 int aspect_h = luaL_checknumber(L, 2);
292 return wrap_lua_object<EffectChain>(L, "EffectChain", aspect_w, aspect_h, theme->get_resource_pool());
295 int EffectChain_gc(lua_State* L)
297 assert(lua_gettop(L) == 1);
298 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
299 chain->~EffectChain();
303 int EffectChain_add_live_input(lua_State* L)
305 assert(lua_gettop(L) == 3);
306 Theme *theme = get_theme_updata(L);
307 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
308 bool override_bounce = checkbool(L, 2);
309 bool deinterlace = checkbool(L, 3);
310 bmusb::PixelFormat pixel_format = global_flags.ten_bit_input ? bmusb::PixelFormat_10BitYCbCr : bmusb::PixelFormat_8BitYCbCr;
312 // Needs to be nonowned to match add_video_input (see below).
313 return wrap_lua_object_nonowned<LiveInputWrapper>(L, "LiveInputWrapper", theme, chain, pixel_format, override_bounce, deinterlace, /*user_connectable=*/true);
316 int EffectChain_add_video_input(lua_State* L)
318 assert(lua_gettop(L) == 3);
319 Theme *theme = get_theme_updata(L);
320 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
321 FFmpegCapture **capture = (FFmpegCapture **)luaL_checkudata(L, 2, "VideoInput");
322 bool deinterlace = checkbool(L, 3);
324 // These need to be nonowned, so that the LiveInputWrapper still exists
325 // and can feed frames to the right EffectChain even if the Lua code
326 // doesn't care about the object anymore. (If we change this, we'd need
327 // to also unregister the signal connection on __gc.)
328 int ret = wrap_lua_object_nonowned<LiveInputWrapper>(
329 L, "LiveInputWrapper", theme, chain, (*capture)->get_current_pixel_format(),
330 /*override_bounce=*/false, deinterlace, /*user_connectable=*/false);
332 Theme *theme = get_theme_updata(L);
333 LiveInputWrapper **live_input = (LiveInputWrapper **)lua_touserdata(L, -1);
334 theme->register_video_signal_connection(chain, *live_input, *capture);
340 int EffectChain_add_html_input(lua_State* L)
342 assert(lua_gettop(L) == 2);
343 Theme *theme = get_theme_updata(L);
344 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
345 CEFCapture **capture = (CEFCapture **)luaL_checkudata(L, 2, "HTMLInput");
347 // These need to be nonowned, so that the LiveInputWrapper still exists
348 // and can feed frames to the right EffectChain even if the Lua code
349 // doesn't care about the object anymore. (If we change this, we'd need
350 // to also unregister the signal connection on __gc.)
351 int ret = wrap_lua_object_nonowned<LiveInputWrapper>(
352 L, "LiveInputWrapper", theme, chain, (*capture)->get_current_pixel_format(),
353 /*override_bounce=*/false, /*deinterlace=*/false, /*user_connectable=*/false);
355 Theme *theme = get_theme_updata(L);
356 LiveInputWrapper **live_input = (LiveInputWrapper **)lua_touserdata(L, -1);
357 theme->register_html_signal_connection(chain, *live_input, *capture);
363 int EffectChain_add_effect(lua_State* L)
365 assert(lua_gettop(L) >= 2);
366 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
368 // TODO: Better error reporting.
370 if (luaL_testudata(L, 2, "ImageInput")) {
371 effect = *(ImageInput **)luaL_checkudata(L, 2, "ImageInput");
373 effect = get_effect_from_blueprint(chain, L, 2);
375 if (lua_gettop(L) == 2) {
376 if (effect->num_inputs() == 0) {
377 chain->add_input((Input *)effect);
379 chain->add_effect(effect);
382 vector<Effect *> inputs;
383 for (int idx = 3; idx <= lua_gettop(L); ++idx) {
384 if (luaL_testudata(L, idx, "LiveInputWrapper")) {
385 LiveInputWrapper **input = (LiveInputWrapper **)lua_touserdata(L, idx);
386 inputs.push_back((*input)->get_effect());
387 } else if (luaL_testudata(L, idx, "ImageInput")) {
388 ImageInput *image = *(ImageInput **)luaL_checkudata(L, idx, "ImageInput");
389 inputs.push_back(image);
391 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, idx, "EffectBlueprint");
392 assert(blueprint->effect != nullptr); // Parent must be added to the graph.
393 inputs.push_back(blueprint->effect);
396 chain->add_effect(effect, inputs);
399 lua_settop(L, 2); // Return the effect itself.
401 // Make sure Lua doesn't garbage-collect it away.
402 lua_pushvalue(L, -1);
403 luaL_ref(L, LUA_REGISTRYINDEX); // TODO: leak?
408 int EffectChain_finalize(lua_State* L)
410 assert(lua_gettop(L) == 2);
411 EffectChain *chain = (EffectChain *)luaL_checkudata(L, 1, "EffectChain");
412 bool is_main_chain = checkbool(L, 2);
413 add_outputs_and_finalize(chain, is_main_chain);
417 int LiveInputWrapper_connect_signal(lua_State* L)
419 assert(lua_gettop(L) == 2);
420 LiveInputWrapper **input = (LiveInputWrapper **)luaL_checkudata(L, 1, "LiveInputWrapper");
421 int signal_num = luaL_checknumber(L, 2);
422 bool success = (*input)->connect_signal(signal_num);
424 print_warning(L, "Calling connect_signal() on a video or HTML input. Ignoring.\n");
429 int ImageInput_new(lua_State* L)
431 assert(lua_gettop(L) == 1);
432 string filename = checkstdstring(L, 1);
433 return wrap_lua_object_nonowned<ImageInput>(L, "ImageInput", filename);
436 int VideoInput_new(lua_State* L)
438 assert(lua_gettop(L) == 2);
439 string filename = checkstdstring(L, 1);
440 int pixel_format = luaL_checknumber(L, 2);
441 if (pixel_format != bmusb::PixelFormat_8BitYCbCrPlanar &&
442 pixel_format != bmusb::PixelFormat_8BitBGRA) {
443 print_warning(L, "Invalid enum %d used for video format, choosing Y'CbCr.\n", pixel_format);
444 pixel_format = bmusb::PixelFormat_8BitYCbCrPlanar;
446 int ret = wrap_lua_object_nonowned<FFmpegCapture>(L, "VideoInput", filename, global_flags.width, global_flags.height);
448 FFmpegCapture **capture = (FFmpegCapture **)lua_touserdata(L, -1);
449 (*capture)->set_pixel_format(bmusb::PixelFormat(pixel_format));
451 Theme *theme = get_theme_updata(L);
452 theme->register_video_input(*capture);
457 int VideoInput_rewind(lua_State* L)
459 assert(lua_gettop(L) == 1);
460 FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
461 (*video_input)->rewind();
465 int VideoInput_disconnect(lua_State* L)
467 assert(lua_gettop(L) == 1);
468 FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
469 (*video_input)->disconnect();
473 int VideoInput_change_rate(lua_State* L)
475 assert(lua_gettop(L) == 2);
476 FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
477 double new_rate = luaL_checknumber(L, 2);
478 (*video_input)->change_rate(new_rate);
482 int VideoInput_get_signal_num(lua_State* L)
484 assert(lua_gettop(L) == 1);
485 FFmpegCapture **video_input = (FFmpegCapture **)luaL_checkudata(L, 1, "VideoInput");
486 lua_pushnumber(L, -1 - (*video_input)->get_card_index());
490 int HTMLInput_new(lua_State* L)
493 assert(lua_gettop(L) == 1);
494 string url = checkstdstring(L, 1);
495 int ret = wrap_lua_object_nonowned<CEFCapture>(L, "HTMLInput", url, global_flags.width, global_flags.height);
497 CEFCapture **capture = (CEFCapture **)lua_touserdata(L, -1);
498 Theme *theme = get_theme_updata(L);
499 theme->register_html_input(*capture);
503 fprintf(stderr, "This version of Nageru has been compiled without CEF support.\n");
504 fprintf(stderr, "HTMLInput is not available.\n");
510 int HTMLInput_set_url(lua_State* L)
512 assert(lua_gettop(L) == 2);
513 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
514 string new_url = checkstdstring(L, 2);
515 (*video_input)->set_url(new_url);
519 int HTMLInput_reload(lua_State* L)
521 assert(lua_gettop(L) == 1);
522 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
523 (*video_input)->reload();
527 int HTMLInput_set_max_fps(lua_State* L)
529 assert(lua_gettop(L) == 2);
530 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
531 int max_fps = lrint(luaL_checknumber(L, 2));
532 (*video_input)->set_max_fps(max_fps);
536 int HTMLInput_execute_javascript_async(lua_State* L)
538 assert(lua_gettop(L) == 2);
539 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
540 string js = checkstdstring(L, 2);
541 (*video_input)->execute_javascript_async(js);
545 int HTMLInput_resize(lua_State* L)
547 assert(lua_gettop(L) == 3);
548 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
549 unsigned width = lrint(luaL_checknumber(L, 2));
550 unsigned height = lrint(luaL_checknumber(L, 3));
551 (*video_input)->resize(width, height);
555 int HTMLInput_get_signal_num(lua_State* L)
557 assert(lua_gettop(L) == 1);
558 CEFCapture **video_input = (CEFCapture **)luaL_checkudata(L, 1, "HTMLInput");
559 lua_pushnumber(L, -1 - (*video_input)->get_card_index());
564 int IdentityEffect_new(lua_State* L)
566 assert(lua_gettop(L) == 0);
567 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", IDENTITY_EFFECT);
570 int WhiteBalanceEffect_new(lua_State* L)
572 assert(lua_gettop(L) == 0);
573 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", WHITE_BALANCE_EFFECT);
576 int ResampleEffect_new(lua_State* L)
578 assert(lua_gettop(L) == 0);
579 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", RESAMPLE_EFFECT);
582 int PaddingEffect_new(lua_State* L)
584 assert(lua_gettop(L) == 0);
585 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", PADDING_EFFECT);
588 int IntegralPaddingEffect_new(lua_State* L)
590 assert(lua_gettop(L) == 0);
591 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", INTEGRAL_PADDING_EFFECT);
594 int OverlayEffect_new(lua_State* L)
596 assert(lua_gettop(L) == 0);
597 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", OVERLAY_EFFECT);
600 int ResizeEffect_new(lua_State* L)
602 assert(lua_gettop(L) == 0);
603 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", RESIZE_EFFECT);
606 int MultiplyEffect_new(lua_State* L)
608 assert(lua_gettop(L) == 0);
609 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", MULTIPLY_EFFECT);
612 int MixEffect_new(lua_State* L)
614 assert(lua_gettop(L) == 0);
615 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", MIX_EFFECT);
618 int LiftGammaGainEffect_new(lua_State* L)
620 assert(lua_gettop(L) == 0);
621 return wrap_lua_object_nonowned<EffectBlueprint>(L, "EffectBlueprint", LIFT_GAMMA_GAIN_EFFECT);
624 int InputStateInfo_get_width(lua_State* L)
626 assert(lua_gettop(L) == 2);
627 InputStateInfo *input_state_info = get_input_state_info(L, 1);
629 Theme *theme = get_theme_updata(L);
630 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
631 lua_pushnumber(L, input_state_info->last_width[signal_num]);
635 int InputStateInfo_get_height(lua_State* L)
637 assert(lua_gettop(L) == 2);
638 InputStateInfo *input_state_info = get_input_state_info(L, 1);
639 Theme *theme = get_theme_updata(L);
640 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
641 lua_pushnumber(L, input_state_info->last_height[signal_num]);
645 int InputStateInfo_get_frame_height(lua_State* L)
647 assert(lua_gettop(L) == 2);
648 InputStateInfo *input_state_info = get_input_state_info(L, 1);
649 Theme *theme = get_theme_updata(L);
650 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
651 unsigned height = input_state_info->last_height[signal_num];
652 if (input_state_info->last_interlaced[signal_num]) {
655 lua_pushnumber(L, height);
659 int InputStateInfo_get_interlaced(lua_State* L)
661 assert(lua_gettop(L) == 2);
662 InputStateInfo *input_state_info = get_input_state_info(L, 1);
663 Theme *theme = get_theme_updata(L);
664 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
665 lua_pushboolean(L, input_state_info->last_interlaced[signal_num]);
669 int InputStateInfo_get_has_signal(lua_State* L)
671 assert(lua_gettop(L) == 2);
672 InputStateInfo *input_state_info = get_input_state_info(L, 1);
673 Theme *theme = get_theme_updata(L);
674 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
675 lua_pushboolean(L, input_state_info->last_has_signal[signal_num]);
679 int InputStateInfo_get_is_connected(lua_State* L)
681 assert(lua_gettop(L) == 2);
682 InputStateInfo *input_state_info = get_input_state_info(L, 1);
683 Theme *theme = get_theme_updata(L);
684 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
685 lua_pushboolean(L, input_state_info->last_is_connected[signal_num]);
689 int InputStateInfo_get_frame_rate_nom(lua_State* L)
691 assert(lua_gettop(L) == 2);
692 InputStateInfo *input_state_info = get_input_state_info(L, 1);
693 Theme *theme = get_theme_updata(L);
694 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
695 lua_pushnumber(L, input_state_info->last_frame_rate_nom[signal_num]);
699 int InputStateInfo_get_frame_rate_den(lua_State* L)
701 assert(lua_gettop(L) == 2);
702 InputStateInfo *input_state_info = get_input_state_info(L, 1);
703 Theme *theme = get_theme_updata(L);
704 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
705 lua_pushnumber(L, input_state_info->last_frame_rate_den[signal_num]);
709 int InputStateInfo_get_last_subtitle(lua_State* L)
711 assert(lua_gettop(L) == 2);
712 InputStateInfo *input_state_info = get_input_state_info(L, 1);
713 Theme *theme = get_theme_updata(L);
714 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
715 if (!input_state_info->has_last_subtitle[signal_num]) {
718 lua_pushstring(L, input_state_info->last_subtitle[signal_num].c_str());
725 // Helper function to write e.g. “60” or “59.94”.
726 string format_frame_rate(int nom, int den)
729 if (nom % den == 0) {
730 snprintf(buf, sizeof(buf), "%d", nom / den);
732 snprintf(buf, sizeof(buf), "%.2f", double(nom) / den);
737 // Helper function to write e.g. “720p60”.
738 string get_human_readable_resolution(const InputStateInfo *input_state_info, int signal_num)
741 if (input_state_info->last_interlaced[signal_num]) {
742 snprintf(buf, sizeof(buf), "%di", input_state_info->last_height[signal_num] * 2);
744 // Show field rate instead of frame rate; really for cosmetics only
745 // (and actually contrary to EBU recommendations, although in line
746 // with typical user expectations).
747 return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num] * 2,
748 input_state_info->last_frame_rate_den[signal_num]);
750 snprintf(buf, sizeof(buf), "%dp", input_state_info->last_height[signal_num]);
751 return buf + format_frame_rate(input_state_info->last_frame_rate_nom[signal_num],
752 input_state_info->last_frame_rate_den[signal_num]);
758 int InputStateInfo_get_human_readable_resolution(lua_State* L)
760 assert(lua_gettop(L) == 2);
761 InputStateInfo *input_state_info = get_input_state_info(L, 1);
762 Theme *theme = get_theme_updata(L);
763 int signal_num = theme->map_signal(luaL_checknumber(L, 2));
766 if (!input_state_info->last_is_connected[signal_num]) {
767 str = "disconnected";
768 } else if (input_state_info->last_height[signal_num] <= 0) {
770 } else if (!input_state_info->last_has_signal[signal_num]) {
771 if (input_state_info->last_height[signal_num] == 525) {
772 // Special mode for the USB3 cards.
775 str = get_human_readable_resolution(input_state_info, signal_num) + ", no signal";
778 str = get_human_readable_resolution(input_state_info, signal_num);
781 lua_pushstring(L, str.c_str());
786 int EffectBlueprint_set_int(lua_State *L)
788 assert(lua_gettop(L) == 3);
789 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
790 string key = checkstdstring(L, 2);
791 float value = luaL_checknumber(L, 3);
792 if (blueprint->effect != nullptr) {
793 if (!blueprint->effect->set_int(key, value)) {
794 luaL_error(L, "Effect refused set_int(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
797 // TODO: check validity already here, if possible?
798 blueprint->int_parameters[key] = value;
803 int EffectBlueprint_set_float(lua_State *L)
805 assert(lua_gettop(L) == 3);
806 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
807 string key = checkstdstring(L, 2);
808 float value = luaL_checknumber(L, 3);
809 if (blueprint->effect != nullptr) {
810 if (!blueprint->effect->set_float(key, value)) {
811 luaL_error(L, "Effect refused set_float(\"%s\", %d) (invalid key?)", key.c_str(), int(value));
814 // TODO: check validity already here, if possible?
815 blueprint->float_parameters[key] = value;
820 int EffectBlueprint_set_vec3(lua_State *L)
822 assert(lua_gettop(L) == 5);
823 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
824 string key = checkstdstring(L, 2);
826 v[0] = luaL_checknumber(L, 3);
827 v[1] = luaL_checknumber(L, 4);
828 v[2] = luaL_checknumber(L, 5);
830 if (blueprint->effect != nullptr) {
831 if (!blueprint->effect->set_vec3(key, v.data())) {
832 luaL_error(L, "Effect refused set_vec3(\"%s\", %f, %f, %f) (invalid key?)", key.c_str(),
836 // TODO: check validity already here, if possible?
837 blueprint->vec3_parameters[key] = v;
843 int EffectBlueprint_set_vec4(lua_State *L)
845 assert(lua_gettop(L) == 6);
846 EffectBlueprint *blueprint = *(EffectBlueprint **)luaL_checkudata(L, 1, "EffectBlueprint");
847 string key = checkstdstring(L, 2);
849 v[0] = luaL_checknumber(L, 3);
850 v[1] = luaL_checknumber(L, 4);
851 v[2] = luaL_checknumber(L, 5);
852 v[3] = luaL_checknumber(L, 6);
853 if (blueprint->effect != nullptr) {
854 if (!blueprint->effect->set_vec4(key, v.data())) {
855 luaL_error(L, "Effect refused set_vec4(\"%s\", %f, %f, %f, %f) (invalid key?)", key.c_str(),
856 v[0], v[1], v[2], v[3]);
859 // TODO: check validity already here, if possible?
860 blueprint->vec4_parameters[key] = v;
865 const luaL_Reg Scene_funcs[] = {
866 { "new", Scene_new },
867 { "__gc", Scene_gc },
868 { "add_input", Scene::add_input },
869 { "add_auto_white_balance", Scene::add_auto_white_balance },
870 { "add_effect", Scene::add_effect },
871 { "add_optional_effect", Scene::add_optional_effect },
872 { "finalize", Scene::finalize },
876 const luaL_Reg Block_funcs[] = {
877 { "display", Block_display },
878 { "choose", Block_choose },
879 { "enable", Block_enable },
880 { "enable_if", Block_enable_if },
881 { "disable", Block_disable },
882 { "always_disable_if_disabled", Block_always_disable_if_disabled },
883 { "promise_to_disable_if_enabled", Block_promise_to_disable_if_enabled },
884 { "set_int", Block_set_int },
885 { "set_float", Block_set_float },
886 { "set_vec3", Block_set_vec3 },
887 { "set_vec4", Block_set_vec4 },
891 const luaL_Reg EffectBlueprint_funcs[] = {
892 // NOTE: No new() function; that's for the individual effects.
893 { "set_int", EffectBlueprint_set_int },
894 { "set_float", EffectBlueprint_set_float },
895 { "set_vec3", EffectBlueprint_set_vec3 },
896 { "set_vec4", EffectBlueprint_set_vec4 },
900 const luaL_Reg EffectChain_funcs[] = {
901 { "new", EffectChain_new },
902 { "__gc", EffectChain_gc },
903 { "add_live_input", EffectChain_add_live_input },
904 { "add_video_input", EffectChain_add_video_input },
906 { "add_html_input", EffectChain_add_html_input },
908 { "add_effect", EffectChain_add_effect },
909 { "finalize", EffectChain_finalize },
913 const luaL_Reg LiveInputWrapper_funcs[] = {
914 { "connect_signal", LiveInputWrapper_connect_signal },
918 const luaL_Reg ImageInput_funcs[] = {
919 { "new", ImageInput_new },
923 const luaL_Reg VideoInput_funcs[] = {
924 { "new", VideoInput_new },
925 { "rewind", VideoInput_rewind },
926 { "disconnect", VideoInput_disconnect },
927 { "change_rate", VideoInput_change_rate },
928 { "get_signal_num", VideoInput_get_signal_num },
932 const luaL_Reg HTMLInput_funcs[] = {
933 { "new", HTMLInput_new },
935 { "set_url", HTMLInput_set_url },
936 { "reload", HTMLInput_reload },
937 { "set_max_fps", HTMLInput_set_max_fps },
938 { "execute_javascript_async", HTMLInput_execute_javascript_async },
939 { "resize", HTMLInput_resize },
940 { "get_signal_num", HTMLInput_get_signal_num },
946 // All of these are solely for new(); the returned metatable will be that of
947 // EffectBlueprint, and Effect (returned from add_effect()) is its own type.
949 const luaL_Reg IdentityEffect_funcs[] = {
950 { "new", IdentityEffect_new },
954 const luaL_Reg WhiteBalanceEffect_funcs[] = {
955 { "new", WhiteBalanceEffect_new },
959 const luaL_Reg ResampleEffect_funcs[] = {
960 { "new", ResampleEffect_new },
964 const luaL_Reg PaddingEffect_funcs[] = {
965 { "new", PaddingEffect_new },
969 const luaL_Reg IntegralPaddingEffect_funcs[] = {
970 { "new", IntegralPaddingEffect_new },
974 const luaL_Reg OverlayEffect_funcs[] = {
975 { "new", OverlayEffect_new },
979 const luaL_Reg ResizeEffect_funcs[] = {
980 { "new", ResizeEffect_new },
984 const luaL_Reg MultiplyEffect_funcs[] = {
985 { "new", MultiplyEffect_new },
989 const luaL_Reg MixEffect_funcs[] = {
990 { "new", MixEffect_new },
994 const luaL_Reg LiftGammaGainEffect_funcs[] = {
995 { "new", LiftGammaGainEffect_new },
1001 const luaL_Reg InputStateInfo_funcs[] = {
1002 { "get_width", InputStateInfo_get_width },
1003 { "get_height", InputStateInfo_get_height },
1004 { "get_frame_width", InputStateInfo_get_width }, // Same as get_width().
1005 { "get_frame_height", InputStateInfo_get_frame_height },
1006 { "get_interlaced", InputStateInfo_get_interlaced },
1007 { "get_has_signal", InputStateInfo_get_has_signal },
1008 { "get_is_connected", InputStateInfo_get_is_connected },
1009 { "get_frame_rate_nom", InputStateInfo_get_frame_rate_nom },
1010 { "get_frame_rate_den", InputStateInfo_get_frame_rate_den },
1011 { "get_last_subtitle", InputStateInfo_get_last_subtitle },
1012 { "get_human_readable_resolution", InputStateInfo_get_human_readable_resolution },
1016 const luaL_Reg ThemeMenu_funcs[] = {
1017 { "set", ThemeMenu_set },
1023 LiveInputWrapper::LiveInputWrapper(
1026 bmusb::PixelFormat pixel_format,
1027 bool override_bounce,
1029 bool user_connectable)
1031 pixel_format(pixel_format),
1032 deinterlace(deinterlace),
1033 user_connectable(user_connectable)
1035 ImageFormat inout_format;
1036 inout_format.color_space = COLORSPACE_sRGB;
1038 // Gamma curve depends on the input signal, and we don't really get any
1039 // indications. A camera would be expected to do Rec. 709, but
1040 // I haven't checked if any do in practice. However, computers _do_ output
1041 // in sRGB gamma (ie., they don't convert from sRGB to Rec. 709), and
1042 // I wouldn't really be surprised if most non-professional cameras do, too.
1043 // So we pick sRGB as the least evil here.
1044 inout_format.gamma_curve = GAMMA_sRGB;
1046 unsigned num_inputs;
1048 deinterlace_effect = new movit::DeinterlaceEffect();
1050 // As per the comments in deinterlace_effect.h, we turn this off.
1051 // The most likely interlaced input for us is either a camera
1052 // (where it's fine to turn it off) or a laptop (where it _should_
1054 CHECK(deinterlace_effect->set_int("enable_spatial_interlacing_check", 0));
1056 num_inputs = deinterlace_effect->num_inputs();
1057 assert(num_inputs == FRAME_HISTORY_LENGTH);
1062 if (pixel_format == bmusb::PixelFormat_8BitBGRA) {
1063 for (unsigned i = 0; i < num_inputs; ++i) {
1064 // We upload our textures ourselves, and Movit swaps
1065 // R and B in the shader if we specify BGRA, so lie and say RGBA.
1066 rgba_inputs.push_back(new sRGBSwitchingFlatInput(inout_format, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, GL_UNSIGNED_BYTE, global_flags.width, global_flags.height));
1067 chain->add_input(rgba_inputs.back());
1071 vector<Effect *> reverse_inputs(rgba_inputs.rbegin(), rgba_inputs.rend());
1072 chain->add_effect(deinterlace_effect, reverse_inputs);
1075 assert(pixel_format == bmusb::PixelFormat_8BitYCbCr ||
1076 pixel_format == bmusb::PixelFormat_10BitYCbCr ||
1077 pixel_format == bmusb::PixelFormat_8BitYCbCrPlanar);
1079 // Most of these settings will be overridden later if using PixelFormat_8BitYCbCrPlanar.
1080 input_ycbcr_format.chroma_subsampling_x = (pixel_format == bmusb::PixelFormat_10BitYCbCr) ? 1 : 2;
1081 input_ycbcr_format.chroma_subsampling_y = 1;
1082 input_ycbcr_format.num_levels = (pixel_format == bmusb::PixelFormat_10BitYCbCr) ? 1024 : 256;
1083 input_ycbcr_format.cb_x_position = 0.0;
1084 input_ycbcr_format.cr_x_position = 0.0;
1085 input_ycbcr_format.cb_y_position = 0.5;
1086 input_ycbcr_format.cr_y_position = 0.5;
1087 input_ycbcr_format.luma_coefficients = YCBCR_REC_709; // Will be overridden later even if not planar.
1088 input_ycbcr_format.full_range = false; // Will be overridden later even if not planar.
1090 for (unsigned i = 0; i < num_inputs; ++i) {
1091 // When using 10-bit input, we're converting to interleaved through v210Converter.
1092 YCbCrInputSplitting splitting;
1093 if (pixel_format == bmusb::PixelFormat_10BitYCbCr) {
1094 splitting = YCBCR_INPUT_INTERLEAVED;
1095 } else if (pixel_format == bmusb::PixelFormat_8BitYCbCr) {
1096 splitting = YCBCR_INPUT_SPLIT_Y_AND_CBCR;
1098 splitting = YCBCR_INPUT_PLANAR;
1100 if (override_bounce) {
1101 ycbcr_inputs.push_back(new NonBouncingYCbCrInput(inout_format, input_ycbcr_format, global_flags.width, global_flags.height, splitting));
1103 ycbcr_inputs.push_back(new YCbCrInput(inout_format, input_ycbcr_format, global_flags.width, global_flags.height, splitting));
1105 chain->add_input(ycbcr_inputs.back());
1109 vector<Effect *> reverse_inputs(ycbcr_inputs.rbegin(), ycbcr_inputs.rend());
1110 chain->add_effect(deinterlace_effect, reverse_inputs);
1115 bool LiveInputWrapper::connect_signal(int signal_num)
1117 if (!user_connectable) {
1121 if (global_mixer == nullptr) {
1126 signal_num = theme->map_signal(signal_num);
1127 connect_signal_raw(signal_num, *theme->input_state);
1131 void LiveInputWrapper::connect_signal_raw(int signal_num, const InputState &input_state)
1133 BufferedFrame first_frame = input_state.buffered_frames[signal_num][0];
1134 if (first_frame.frame == nullptr) {
1138 unsigned width, height;
1140 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)first_frame.frame->userdata;
1141 width = userdata->last_width[first_frame.field_number];
1142 height = userdata->last_height[first_frame.field_number];
1143 if (userdata->last_interlaced) {
1148 movit::YCbCrLumaCoefficients ycbcr_coefficients = input_state.ycbcr_coefficients[signal_num];
1149 bool full_range = input_state.full_range[signal_num];
1151 if (input_state.ycbcr_coefficients_auto[signal_num]) {
1154 // The Blackmagic driver docs claim that the device outputs Y'CbCr
1155 // according to Rec. 601, but this seems to indicate the subsampling
1156 // positions only, as they publish Y'CbCr → RGB formulas that are
1157 // different for HD and SD (corresponding to Rec. 709 and 601, respectively),
1158 // and a Lenovo X1 gen 3 I used to test definitely outputs Rec. 709
1159 // (at least up to rounding error). Other devices seem to use Rec. 601
1160 // even on HD resolutions. Nevertheless, Rec. 709 _is_ the right choice
1161 // for HD, so we default to that if the user hasn't set anything.
1162 if (height >= 720) {
1163 ycbcr_coefficients = YCBCR_REC_709;
1165 ycbcr_coefficients = YCBCR_REC_601;
1169 // This is a global, but it doesn't really matter.
1170 input_ycbcr_format.luma_coefficients = ycbcr_coefficients;
1171 input_ycbcr_format.full_range = full_range;
1173 BufferedFrame last_good_frame = first_frame;
1174 for (unsigned i = 0; i < max(ycbcr_inputs.size(), rgba_inputs.size()); ++i) {
1175 BufferedFrame frame = input_state.buffered_frames[signal_num][i];
1176 if (frame.frame == nullptr) {
1177 // Not enough data; reuse last frame (well, field).
1178 // This is suboptimal, but we have nothing better.
1179 frame = last_good_frame;
1181 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
1183 unsigned this_width = userdata->last_width[frame.field_number];
1184 unsigned this_height = userdata->last_height[frame.field_number];
1185 if (this_width != width || this_height != height) {
1186 // Resolution changed; reuse last frame/field.
1187 frame = last_good_frame;
1188 userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
1191 assert(userdata->pixel_format == pixel_format);
1192 switch (pixel_format) {
1193 case bmusb::PixelFormat_8BitYCbCr:
1194 ycbcr_inputs[i]->set_texture_num(0, userdata->tex_y[frame.field_number]);
1195 ycbcr_inputs[i]->set_texture_num(1, userdata->tex_cbcr[frame.field_number]);
1196 ycbcr_inputs[i]->change_ycbcr_format(input_ycbcr_format);
1197 ycbcr_inputs[i]->set_width(width);
1198 ycbcr_inputs[i]->set_height(height);
1200 case bmusb::PixelFormat_8BitYCbCrPlanar:
1201 ycbcr_inputs[i]->set_texture_num(0, userdata->tex_y[frame.field_number]);
1202 ycbcr_inputs[i]->set_texture_num(1, userdata->tex_cb[frame.field_number]);
1203 ycbcr_inputs[i]->set_texture_num(2, userdata->tex_cr[frame.field_number]);
1204 ycbcr_inputs[i]->change_ycbcr_format(userdata->ycbcr_format);
1205 ycbcr_inputs[i]->set_width(width);
1206 ycbcr_inputs[i]->set_height(height);
1208 case bmusb::PixelFormat_10BitYCbCr:
1209 ycbcr_inputs[i]->set_texture_num(0, userdata->tex_444[frame.field_number]);
1210 ycbcr_inputs[i]->change_ycbcr_format(input_ycbcr_format);
1211 ycbcr_inputs[i]->set_width(width);
1212 ycbcr_inputs[i]->set_height(height);
1214 case bmusb::PixelFormat_8BitBGRA:
1215 rgba_inputs[i]->set_texture_num(userdata->tex_rgba[frame.field_number]);
1216 rgba_inputs[i]->set_width(width);
1217 rgba_inputs[i]->set_height(height);
1223 last_good_frame = frame;
1227 BufferedFrame frame = input_state.buffered_frames[signal_num][0];
1228 CHECK(deinterlace_effect->set_int("current_field_position", frame.field_number));
1234 int call_num_channels(lua_State *L)
1236 lua_getglobal(L, "num_channels");
1238 if (lua_pcall(L, 0, 1, 0) != 0) {
1239 fprintf(stderr, "error running function `num_channels': %s\n", lua_tostring(L, -1));
1240 fprintf(stderr, "Try Nageru.set_num_channels(...) at the start of the script instead.\n");
1244 int num_channels = luaL_checknumber(L, 1);
1246 assert(lua_gettop(L) == 0);
1247 return num_channels;
1252 int Nageru_set_channel_name(lua_State *L)
1254 // NOTE: m is already locked.
1255 Theme *theme = get_theme_updata(L);
1256 unsigned channel = luaL_checknumber(L, 1);
1257 const string text = checkstdstring(L, 2);
1258 theme->channel_names[channel] = text;
1263 int Nageru_set_num_channels(lua_State *L)
1265 // NOTE: m is already locked.
1266 Theme *theme = get_theme_updata(L);
1267 if (theme->startup_finished) {
1268 luaL_error(L, "set_num_channels() can only be called at startup.");
1270 theme->num_channels = luaL_checknumber(L, 1);
1275 int Nageru_set_channel_signal(lua_State *L)
1277 // NOTE: m is already locked.
1278 Theme *theme = get_theme_updata(L);
1279 if (theme->startup_finished) {
1280 luaL_error(L, "set_channel_signal() can only be called at startup.");
1282 unsigned channel = luaL_checknumber(L, 1);
1283 int signal = luaL_checknumber(L, 2);
1284 theme->channel_signals[channel] = signal;
1289 int Nageru_set_supports_wb(lua_State *L)
1291 // NOTE: m is already locked.
1292 Theme *theme = get_theme_updata(L);
1293 if (theme->startup_finished) {
1294 luaL_error(L, "set_supports_wb() can only be called at startup.");
1296 unsigned channel = luaL_checknumber(L, 1);
1297 bool supports_wb = checkbool(L, 2);
1298 theme->channel_supports_wb[channel] = supports_wb;
1303 // NOTE: There's a race condition in all of the audio functions; if the mapping
1304 // is changed by the user underway, you might not be manipulating the bus you
1305 // expect. (You should not get crashes, though.) There's not all that much we
1306 // can do about it, short of locking the entire mixer while anything from the
1309 int Nageru_get_num_audio_buses(lua_State *L)
1311 if (global_audio_mixer == nullptr) {
1312 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1313 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1315 lua_pushinteger(L, global_audio_mixer->num_buses());
1319 int Nageru_get_audio_bus_name(lua_State *L)
1321 if (global_audio_mixer == nullptr) {
1322 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1323 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1325 int bus_index = luaL_checknumber(L, 1);
1326 InputMapping input_mapping = global_audio_mixer->get_input_mapping();
1327 if (bus_index < 0 || size_t(bus_index) >= input_mapping.buses.size()) {
1328 // Doesn't fix the race, but fixes other out-of-bounds.
1329 print_warning(L, "Theme called get_audio_bus_name() on nonexistent bus %d; returning nil.\n", bus_index);
1332 lua_pushstring(L, input_mapping.buses[bus_index].name.c_str());
1337 int Nageru_get_audio_bus_fader_level_db(lua_State *L)
1339 if (global_audio_mixer == nullptr) {
1340 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1341 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1344 int bus_index = luaL_checknumber(L, 1);
1345 if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1346 // Doesn't fix the race, but fixes other out-of-bounds.
1347 print_warning(L, "Theme called get_audio_bus_fader_level_db() on nonexistent bus %d; returning 0.0.\n", bus_index);
1348 lua_pushnumber(L, 0.0);
1350 lua_pushnumber(L, global_audio_mixer->get_fader_volume(bus_index));
1355 int Nageru_set_audio_bus_fader_level_db(lua_State *L)
1357 if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
1358 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1359 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1362 int bus_index = luaL_checknumber(L, 1);
1363 if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1364 // Doesn't fix the race, but fixes other out-of-bounds.
1365 print_warning(L, "Theme called set_audio_bus_fader_level_db() on nonexistent bus %d; ignoring.\n", bus_index);
1368 double level_db = luaL_checknumber(L, 2);
1370 // Go through the UI, so that it gets updated.
1371 global_mainwindow->set_fader_absolute(bus_index, level_db);
1375 int Nageru_get_audio_bus_mute(lua_State *L)
1377 if (global_audio_mixer == nullptr) {
1378 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1379 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1382 int bus_index = luaL_checknumber(L, 1);
1383 if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1384 // Doesn't fix the race, but fixes other out-of-bounds.
1385 print_warning(L, "Theme called get_audio_bus_mute() on nonexistent bus %d; returning false.\n", bus_index);
1386 lua_pushboolean(L, false);
1388 lua_pushboolean(L, global_audio_mixer->get_mute(bus_index));
1393 int Nageru_set_audio_bus_mute(lua_State *L)
1395 if (global_audio_mixer == nullptr || global_mainwindow == nullptr) {
1396 // The audio mixer isn't set up until we know how many FFmpeg inputs we have.
1397 luaL_error(L, "Audio functions can not be called before the theme is done initializing.");
1400 int bus_index = luaL_checknumber(L, 1);
1401 if (bus_index < 0 || size_t(bus_index) >= global_audio_mixer->num_buses()) {
1402 // Doesn't fix the race, but fixes other out-of-bounds.
1403 print_warning(L, "Theme called set_audio_bus_mute() on nonexistent bus %d; ignoring.\n", bus_index);
1406 bool mute = checkbool(L, 2);
1408 // Go through the UI, so that it gets updated.
1409 if (mute != global_audio_mixer->get_mute(bus_index)) {
1410 global_mainwindow->toggle_mute(bus_index);
1415 Theme::Theme(const string &filename, const vector<string> &search_dirs, ResourcePool *resource_pool, unsigned num_cards)
1416 : resource_pool(resource_pool), num_cards(num_cards), signal_to_card_mapping(global_flags.default_stream_mapping)
1419 channel_names[0] = "Live";
1420 channel_names[1] = "Preview";
1422 L = luaL_newstate();
1425 // Search through all directories until we find a file that will load
1426 // (as in, does not return LUA_ERRFILE); then run it. We store load errors
1427 // from all the attempts, and show them once we know we can't find any of them.
1429 vector<string> errors;
1430 bool success = false;
1432 vector<string> real_search_dirs;
1433 if (!filename.empty() && filename[0] == '/') {
1434 real_search_dirs.push_back("");
1436 real_search_dirs = search_dirs;
1441 for (const string &dir : real_search_dirs) {
1445 path = dir + "/" + filename;
1447 int err = luaL_loadfile(L, path.c_str());
1449 // Save the theme for when we're actually going to run it
1450 // (we need to set up the right environment below first,
1451 // and we couldn't do that before, because we didn't know the
1452 // path to put in Nageru.THEME_PATH).
1453 theme_code_ref = luaL_ref(L, LUA_REGISTRYINDEX);
1454 assert(lua_gettop(L) == 0);
1459 errors.push_back(lua_tostring(L, -1));
1461 if (err != LUA_ERRFILE) {
1462 // The file actually loaded, but failed to parse somehow. Abort; don't try the next one.
1468 for (const string &error : errors) {
1469 fprintf(stderr, "%s\n", error.c_str());
1473 assert(lua_gettop(L) == 0);
1475 // Make sure the path exposed to the theme (as Nageru.THEME_PATH;
1476 // can be useful for locating files when talking to CEF) is absolute.
1477 // In a sense, it would be nice if realpath() had a mode not to
1478 // resolve symlinks, but it doesn't, so we only call it if we don't
1479 // already have an absolute path (which may leave ../ elements etc.).
1480 if (path[0] == '/') {
1483 char *absolute_theme_path = realpath(path.c_str(), nullptr);
1484 theme_path = absolute_theme_path;
1485 free(absolute_theme_path);
1488 // Set up the API we provide.
1490 register_class("Scene", Scene_funcs);
1491 register_class("Block", Block_funcs);
1492 register_class("EffectBlueprint", EffectBlueprint_funcs);
1493 register_class("EffectChain", EffectChain_funcs);
1494 register_class("LiveInputWrapper", LiveInputWrapper_funcs);
1495 register_class("ImageInput", ImageInput_funcs);
1496 register_class("VideoInput", VideoInput_funcs);
1497 register_class("HTMLInput", HTMLInput_funcs);
1498 register_class("IdentityEffect", IdentityEffect_funcs, IDENTITY_EFFECT);
1499 register_class("WhiteBalanceEffect", WhiteBalanceEffect_funcs, WHITE_BALANCE_EFFECT);
1500 register_class("ResampleEffect", ResampleEffect_funcs, RESAMPLE_EFFECT);
1501 register_class("PaddingEffect", PaddingEffect_funcs, PADDING_EFFECT);
1502 register_class("IntegralPaddingEffect", IntegralPaddingEffect_funcs, INTEGRAL_PADDING_EFFECT);
1503 register_class("OverlayEffect", OverlayEffect_funcs, OVERLAY_EFFECT);
1504 register_class("ResizeEffect", ResizeEffect_funcs, RESIZE_EFFECT);
1505 register_class("MultiplyEffect", MultiplyEffect_funcs, MULTIPLY_EFFECT);
1506 register_class("MixEffect", MixEffect_funcs, MIX_EFFECT);
1507 register_class("LiftGammaGainEffect", LiftGammaGainEffect_funcs, LIFT_GAMMA_GAIN_EFFECT);
1508 register_class("InputStateInfo", InputStateInfo_funcs);
1509 register_class("ThemeMenu", ThemeMenu_funcs);
1511 // Now actually run the theme to get everything set up.
1512 lua_rawgeti(L, LUA_REGISTRYINDEX, theme_code_ref);
1513 luaL_unref(L, LUA_REGISTRYINDEX, theme_code_ref);
1514 if (lua_pcall(L, 0, 0, 0)) {
1515 fprintf(stderr, "Error when running %s: %s\n", path.c_str(), lua_tostring(L, -1));
1518 assert(lua_gettop(L) == 0);
1520 if (num_channels == -1) {
1521 // Ask it for the number of channels.
1522 num_channels = call_num_channels(L);
1524 startup_finished = true;
1533 void Theme::register_globals()
1535 // Set Nageru.VIDEO_FORMAT_BGRA = bmusb::PixelFormat_8BitBGRA, etc.
1536 const vector<pair<string, int>> num_constants = {
1537 { "VIDEO_FORMAT_BGRA", bmusb::PixelFormat_8BitBGRA },
1538 { "VIDEO_FORMAT_YCBCR", bmusb::PixelFormat_8BitYCbCrPlanar },
1539 { "CHECKABLE", MenuEntry::CHECKABLE },
1540 { "CHECKED", MenuEntry::CHECKED },
1542 const vector<pair<string, string>> str_constants = {
1543 { "THEME_PATH", theme_path },
1546 lua_newtable(L); // t = {}
1548 for (const pair<string, int> &constant : num_constants) {
1549 lua_pushstring(L, constant.first.c_str());
1550 lua_pushinteger(L, constant.second);
1551 lua_settable(L, 1); // t[key] = value
1553 for (const pair<string, string> &constant : str_constants) {
1554 lua_pushstring(L, constant.first.c_str());
1555 lua_pushstring(L, constant.second.c_str());
1556 lua_settable(L, 1); // t[key] = value
1559 const luaL_Reg Nageru_funcs[] = {
1560 // Channel information.
1561 { "set_channel_name", Nageru_set_channel_name },
1562 { "set_num_channels", Nageru_set_num_channels },
1563 { "set_channel_signal", Nageru_set_channel_signal },
1564 { "set_supports_wb", Nageru_set_supports_wb },
1567 { "get_num_audio_buses", Nageru_get_num_audio_buses },
1568 { "get_audio_bus_name", Nageru_get_audio_bus_name },
1569 { "get_audio_bus_fader_level_db", Nageru_get_audio_bus_fader_level_db },
1570 { "set_audio_bus_fader_level_db", Nageru_set_audio_bus_fader_level_db },
1571 { "get_audio_bus_mute", Nageru_get_audio_bus_mute },
1572 { "set_audio_bus_mute", Nageru_set_audio_bus_mute },
1574 { nullptr, nullptr }
1576 lua_pushlightuserdata(L, this);
1577 luaL_setfuncs(L, Nageru_funcs, 1); // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
1579 lua_setglobal(L, "Nageru"); // Nageru = t
1580 assert(lua_gettop(L) == 0);
1583 void Theme::register_class(const char *class_name, const luaL_Reg *funcs, EffectType effect_type)
1585 assert(lua_gettop(L) == 0);
1586 luaL_newmetatable(L, class_name); // mt = {}
1587 lua_pushlightuserdata(L, this);
1588 luaL_setfuncs(L, funcs, 1); // for (name,f in funcs) { mt[name] = f, with upvalue {theme} }
1589 lua_pushvalue(L, -1);
1590 lua_setfield(L, -2, "__index"); // mt.__index = mt
1591 if (effect_type != NO_EFFECT_TYPE) {
1592 lua_pushnumber(L, effect_type);
1593 lua_setfield(L, -2, "__effect_type_id"); // mt.__effect_type_id = effect_type
1595 lua_setglobal(L, class_name); // ClassName = mt
1596 assert(lua_gettop(L) == 0);
1599 Theme::Chain Theme::get_chain_from_effect_chain(EffectChain *effect_chain, unsigned num, const InputState &input_state)
1601 if (!lua_isfunction(L, -1)) {
1602 fprintf(stderr, "Argument #-1 should be a function\n");
1605 lua_pushvalue(L, -1);
1606 shared_ptr<LuaRefWithDeleter> funcref(new LuaRefWithDeleter(&m, L, luaL_ref(L, LUA_REGISTRYINDEX)));
1610 chain.chain = effect_chain;
1611 chain.setup_chain = [this, funcref, input_state, effect_chain]{
1612 lock_guard<mutex> lock(m);
1614 assert(this->input_state == nullptr);
1615 this->input_state = &input_state;
1617 // Set up state, including connecting signals.
1618 lua_rawgeti(L, LUA_REGISTRYINDEX, funcref->get());
1619 if (lua_pcall(L, 0, 0, 0) != 0) {
1620 fprintf(stderr, "error running chain setup callback: %s\n", lua_tostring(L, -1));
1623 assert(lua_gettop(L) == 0);
1625 // The theme can't (or at least shouldn't!) call connect_signal() on
1626 // each FFmpeg or CEF input, so we'll do it here.
1627 if (video_signal_connections.count(effect_chain)) {
1628 for (const VideoSignalConnection &conn : video_signal_connections[effect_chain]) {
1629 conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
1633 if (html_signal_connections.count(effect_chain)) {
1634 for (const CEFSignalConnection &conn : html_signal_connections[effect_chain]) {
1635 conn.wrapper->connect_signal_raw(conn.source->get_card_index(), input_state);
1640 this->input_state = nullptr;
1645 Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned height, const InputState &input_state)
1647 const char *func_name = "get_scene"; // For error reporting.
1650 lock_guard<mutex> lock(m);
1651 assert(lua_gettop(L) == 0);
1652 lua_getglobal(L, "get_scene"); /* function to be called */
1653 if (lua_isnil(L, -1)) {
1654 // Try the pre-1.9.0 name for compatibility.
1656 lua_getglobal(L, "get_chain");
1657 func_name = "get_chain";
1659 lua_pushnumber(L, num);
1660 lua_pushnumber(L, t);
1661 lua_pushnumber(L, width);
1662 lua_pushnumber(L, height);
1663 wrap_lua_object<InputStateInfo>(L, "InputStateInfo", input_state);
1665 if (lua_pcall(L, 5, LUA_MULTRET, 0) != 0) {
1666 fprintf(stderr, "error running function “%s”: %s\n", func_name, lua_tostring(L, -1));
1670 if (luaL_testudata(L, -1, "Scene") != nullptr) {
1671 if (lua_gettop(L) != 1) {
1672 luaL_error(L, "%s() for chain number %d returned an Scene, but also other items", func_name);
1674 Scene *auto_effect_chain = (Scene *)luaL_testudata(L, -1, "Scene");
1675 auto chain_and_setup = auto_effect_chain->get_chain(this, L, num, input_state);
1676 chain.chain = chain_and_setup.first;
1677 chain.setup_chain = move(chain_and_setup.second);
1678 } else if (luaL_testudata(L, -2, "EffectChain") != nullptr) {
1679 // Old-style (pre-Nageru 1.9.0) return of a single chain and prepare function.
1680 if (lua_gettop(L) != 2) {
1681 luaL_error(L, "%s() for chain number %d returned an EffectChain, but needs to also return a prepare function (or use Scene)", func_name);
1683 EffectChain *effect_chain = (EffectChain *)luaL_testudata(L, -2, "EffectChain");
1684 chain = get_chain_from_effect_chain(effect_chain, num, input_state);
1686 luaL_error(L, "%s() for chain number %d did not return an EffectChain or Scene\n", func_name, num);
1688 assert(lua_gettop(L) == 0);
1690 // TODO: Can we do better, e.g. by running setup_chain() and seeing what it references?
1691 // Actually, setup_chain does maybe hold all the references we need now anyway?
1692 chain.input_frames.reserve(num_cards * FRAME_HISTORY_LENGTH);
1693 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1694 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
1695 chain.input_frames.push_back(input_state.buffered_frames[card_index][frame_num].frame);
1702 string Theme::get_channel_name(unsigned channel)
1704 lock_guard<mutex> lock(m);
1706 // We never ask the legacy channel_name() about live and preview.
1707 // The defaults are set in our constructor.
1708 if (channel == 0 || channel == 1) {
1709 return channel_names[channel];
1712 lua_getglobal(L, "channel_name");
1713 if (lua_isnil(L, -1)) {
1715 if (channel_names.count(channel)) {
1716 return channel_names[channel];
1718 return "(no title)";
1722 lua_pushnumber(L, channel);
1723 if (lua_pcall(L, 1, 1, 0) != 0) {
1724 fprintf(stderr, "error running function `channel_name': %s\n", lua_tostring(L, -1));
1727 const char *ret = lua_tostring(L, -1);
1728 if (ret == nullptr) {
1729 fprintf(stderr, "function `channel_name' returned nil for channel %d\n", channel);
1730 fprintf(stderr, "Try Nageru.set_channel_name(channel, name) at the start of the script instead.\n");
1734 string retstr = ret;
1736 assert(lua_gettop(L) == 0);
1740 int Theme::get_channel_signal(unsigned channel)
1742 lock_guard<mutex> lock(m);
1743 lua_getglobal(L, "channel_signal");
1744 if (lua_isnil(L, -1)) {
1746 if (channel_signals.count(channel)) {
1747 return channel_signals[channel];
1753 lua_pushnumber(L, channel);
1754 if (lua_pcall(L, 1, 1, 0) != 0) {
1755 fprintf(stderr, "error running function `channel_signal': %s\n", lua_tostring(L, -1));
1756 fprintf(stderr, "Try Nageru.set_channel_signal(channel, signal) at the start of the script instead.\n");
1760 int ret = luaL_checknumber(L, 1);
1762 assert(lua_gettop(L) == 0);
1766 std::string Theme::get_channel_color(unsigned channel)
1768 lock_guard<mutex> lock(m);
1769 lua_getglobal(L, "channel_color");
1770 lua_pushnumber(L, channel);
1771 if (lua_pcall(L, 1, 1, 0) != 0) {
1772 fprintf(stderr, "error running function `channel_color': %s\n", lua_tostring(L, -1));
1776 const char *ret = lua_tostring(L, -1);
1777 if (ret == nullptr) {
1778 fprintf(stderr, "function `channel_color' returned nil for channel %d\n", channel);
1782 string retstr = ret;
1784 assert(lua_gettop(L) == 0);
1788 bool Theme::get_supports_set_wb(unsigned channel)
1790 lock_guard<mutex> lock(m);
1791 lua_getglobal(L, "supports_set_wb");
1792 if (lua_isnil(L, -1)) {
1794 if (channel_supports_wb.count(channel)) {
1795 return channel_supports_wb[channel];
1801 lua_pushnumber(L, channel);
1802 if (lua_pcall(L, 1, 1, 0) != 0) {
1803 fprintf(stderr, "error running function `supports_set_wb': %s\n", lua_tostring(L, -1));
1804 fprintf(stderr, "Try Nageru.set_supports_wb(channel, bool) at the start of the script instead.\n");
1808 bool ret = checkbool(L, -1);
1810 assert(lua_gettop(L) == 0);
1814 void Theme::set_wb(unsigned channel, float r, float g, float b)
1816 int signal = get_channel_signal(channel);
1818 lock_guard<mutex> lock(m);
1820 white_balance_for_signal[signal] = RGBTriplet{ r, g, b };
1823 call_lua_wb_callback(channel, r, g, b);
1826 void Theme::set_wb_for_signal(int signal, float r, float g, float b)
1828 lock_guard<mutex> lock(m);
1829 white_balance_for_signal[signal] = RGBTriplet{ r, g, b };
1831 for (const auto &channel_and_signal : channel_signals) {
1832 if (channel_and_signal.second == signal) {
1833 call_lua_wb_callback(channel_and_signal.first, r, g, b);
1838 void Theme::call_lua_wb_callback(unsigned channel, float r, float g, float b)
1840 lua_getglobal(L, "set_wb");
1841 if (lua_isnil(L, -1)) {
1842 // The function doesn't exist, to just ignore. We've stored the white balance,
1843 // and most likely, it will be picked up by auto white balance instead.
1847 lua_pushnumber(L, channel);
1848 lua_pushnumber(L, r);
1849 lua_pushnumber(L, g);
1850 lua_pushnumber(L, b);
1851 if (lua_pcall(L, 4, 0, 0) != 0) {
1852 fprintf(stderr, "error running function `set_wb': %s\n", lua_tostring(L, -1));
1856 assert(lua_gettop(L) == 0);
1859 RGBTriplet Theme::get_white_balance_for_signal(int signal)
1861 if (white_balance_for_signal.count(signal)) {
1862 return white_balance_for_signal[signal];
1864 return RGBTriplet{ 1.0, 1.0, 1.0 };
1868 vector<string> Theme::get_transition_names(float t)
1870 lock_guard<mutex> lock(m);
1871 lua_getglobal(L, "get_transitions");
1872 lua_pushnumber(L, t);
1873 if (lua_pcall(L, 1, 1, 0) != 0) {
1874 fprintf(stderr, "error running function `get_transitions': %s\n", lua_tostring(L, -1));
1880 while (lua_next(L, -2) != 0) {
1881 ret.push_back(lua_tostring(L, -1));
1885 assert(lua_gettop(L) == 0);
1889 int Theme::map_signal(int signal_num)
1891 // Negative numbers map to raw signals.
1892 if (signal_num < 0) {
1893 return -1 - signal_num;
1896 lock_guard<mutex> lock(map_m);
1897 if (signal_to_card_mapping.count(signal_num)) {
1898 return signal_to_card_mapping[signal_num];
1902 if (global_flags.output_card != -1 && num_cards > 1) {
1903 // Try to exclude the output card from the default card_index.
1904 card_index = signal_num % (num_cards - 1);
1905 if (card_index >= global_flags.output_card) {
1908 if (signal_num >= int(num_cards - 1)) {
1909 print_warning(L, "Theme asked for input %d, but we only have %u input card(s) (card %d is busy with output).\n",
1910 signal_num, num_cards - 1, global_flags.output_card);
1911 fprintf(stderr, "Mapping to card %d instead.\n", card_index);
1914 card_index = signal_num % num_cards;
1915 if (signal_num >= int(num_cards)) {
1916 print_warning(L, "Theme asked for input %d, but we only have %u card(s).\n", signal_num, num_cards);
1917 fprintf(stderr, "Mapping to card %d instead.\n", card_index);
1920 signal_to_card_mapping[signal_num] = card_index;
1924 void Theme::set_signal_mapping(int signal_num, int card_num)
1926 lock_guard<mutex> lock(map_m);
1927 assert(card_num < int(num_cards));
1928 signal_to_card_mapping[signal_num] = card_num;
1931 void Theme::transition_clicked(int transition_num, float t)
1933 lock_guard<mutex> lock(m);
1934 lua_getglobal(L, "transition_clicked");
1935 lua_pushnumber(L, transition_num);
1936 lua_pushnumber(L, t);
1938 if (lua_pcall(L, 2, 0, 0) != 0) {
1939 fprintf(stderr, "error running function `transition_clicked': %s\n", lua_tostring(L, -1));
1942 assert(lua_gettop(L) == 0);
1945 void Theme::channel_clicked(int preview_num)
1947 lock_guard<mutex> lock(m);
1948 lua_getglobal(L, "channel_clicked");
1949 lua_pushnumber(L, preview_num);
1951 if (lua_pcall(L, 1, 0, 0) != 0) {
1952 fprintf(stderr, "error running function `channel_clicked': %s\n", lua_tostring(L, -1));
1955 assert(lua_gettop(L) == 0);
1959 void destroy(T &ref)
1964 Theme::MenuEntry::~MenuEntry()
1969 luaL_unref(entry.L, LUA_REGISTRYINDEX, entry.lua_ref);
1975 vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L);
1977 unique_ptr<Theme::MenuEntry> create_theme_menu_entry(lua_State *L, int index)
1979 unique_ptr<Theme::MenuEntry> entry;
1981 lua_rawgeti(L, index, 1);
1982 const string text = checkstdstring(L, -1);
1986 if (lua_objlen(L, -1) > 2) {
1987 lua_rawgeti(L, -1, 3);
1988 flags = luaL_checknumber(L, -1);
1992 lua_rawgeti(L, index, 2);
1993 if (lua_istable(L, -1)) {
1994 vector<unique_ptr<Theme::MenuEntry>> submenu = create_recursive_theme_menu(L);
1995 entry.reset(new Theme::MenuEntry{ text, move(submenu) });
1998 luaL_checktype(L, -1, LUA_TFUNCTION);
1999 int ref = luaL_ref(L, LUA_REGISTRYINDEX);
2000 entry.reset(new Theme::MenuEntry{ text, L, ref, flags });
2005 vector<unique_ptr<Theme::MenuEntry>> create_recursive_theme_menu(lua_State *L)
2007 vector<unique_ptr<Theme::MenuEntry>> menu;
2008 size_t num_elements = lua_objlen(L, -1);
2009 for (size_t i = 1; i <= num_elements; ++i) {
2010 lua_rawgeti(L, -1, i);
2011 menu.emplace_back(create_theme_menu_entry(L, -1));
2019 int Theme::set_theme_menu(lua_State *L)
2023 vector<unique_ptr<MenuEntry>> root_menu;
2024 int num_elements = lua_gettop(L);
2025 for (int i = 1; i <= num_elements; ++i) {
2026 root_menu.emplace_back(create_theme_menu_entry(L, i));
2028 theme_menu.reset(new MenuEntry("", move(root_menu)));
2030 lua_pop(L, num_elements);
2031 assert(lua_gettop(L) == 0);
2033 if (theme_menu_callback != nullptr) {
2034 theme_menu_callback();
2040 void Theme::theme_menu_entry_clicked(int lua_ref)
2042 lock_guard<mutex> lock(m);
2043 lua_rawgeti(L, LUA_REGISTRYINDEX, lua_ref);
2044 if (lua_pcall(L, 0, 0, 0) != 0) {
2045 fprintf(stderr, "error running menu callback: %s\n", lua_tostring(L, -1));
2050 string Theme::format_status_line(const string &disk_space_left_text, double file_length_seconds)
2052 lock_guard<mutex> lock(m);
2053 lua_getglobal(L, "format_status_line");
2054 if (lua_isnil(L, -1)) {
2056 return disk_space_left_text;
2059 lua_pushstring(L, disk_space_left_text.c_str());
2060 lua_pushnumber(L, file_length_seconds);
2061 if (lua_pcall(L, 2, 1, 0) != 0) {
2062 fprintf(stderr, "error running function format_status_line(): %s\n", lua_tostring(L, -1));
2065 string text = checkstdstring(L, 1);
2067 assert(lua_gettop(L) == 0);