git.sesse.net Git - nageru/blob - mixer.cpp

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect_chain.h>
   8 #include <movit/effect_util.h>
   9 #include <movit/flat_input.h>
  10 #include <movit/image_format.h>
  11 #include <movit/init.h>
  12 #include <movit/resource_pool.h>
  13 #include <pthread.h>
  14 #include <stdint.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <sys/resource.h>
  18 #include <algorithm>
  19 #include <chrono>
  20 #include <condition_variable>
  21 #include <cstddef>
  22 #include <cstdint>
  23 #include <memory>
  24 #include <mutex>
  25 #include <ratio>
  26 #include <string>
  27 #include <thread>
  28 #include <utility>
  29 #include <vector>
  30
  31 #include "DeckLinkAPI.h"
  32 #include "LinuxCOM.h"
  33 #include "alsa_output.h"
  34 #include "bmusb/bmusb.h"
  35 #include "bmusb/fake_capture.h"
  36 #include "chroma_subsampler.h"
  37 #include "context.h"
  38 #include "decklink_capture.h"
  39 #include "decklink_output.h"
  40 #include "defs.h"
  41 #include "disk_space_estimator.h"
  42 #include "ffmpeg_capture.h"
  43 #include "flags.h"
  44 #include "input_mapping.h"
  45 #include "metrics.h"
  46 #include "pbo_frame_allocator.h"
  47 #include "ref_counted_gl_sync.h"
  48 #include "resampling_queue.h"
  49 #include "timebase.h"
  50 #include "timecode_renderer.h"
  51 #include "v210_converter.h"
  52 #include "video_encoder.h"
  53
  54 class IDeckLink;
  55 class QOpenGLContext;
  56
  57 using namespace movit;
  58 using namespace std;
  59 using namespace std::chrono;
  60 using namespace std::placeholders;
  61 using namespace bmusb;
  62
  63 Mixer *global_mixer = nullptr;
  64 bool uses_mlock = false;
  65
  66 namespace {
  67
  68 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  69 {
  70         if (interlaced) {
  71                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  72                         input_state->buffered_frames[card_index][frame_num] =
  73                                 input_state->buffered_frames[card_index][frame_num - 1];
  74                 }
  75                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  76         } else {
  77                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  78                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  79                 }
  80         }
  81 }
  82
  83 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
  84 {
  85         bool first;
  86         switch (userdata->pixel_format) {
  87         case PixelFormat_10BitYCbCr:
  88                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  89                 break;
  90         case PixelFormat_8BitYCbCr:
  91                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
  92                 break;
  93         case PixelFormat_8BitBGRA:
  94                 first = userdata->tex_rgba[field] == 0;
  95                 break;
  96         case PixelFormat_8BitYCbCrPlanar:
  97                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
  98                 break;
  99         default:
 100                 assert(false);
 101         }
 102
 103         if (first ||
 104             width != userdata->last_width[field] ||
 105             height != userdata->last_height[field] ||
 106             cbcr_width != userdata->last_cbcr_width[field] ||
 107             cbcr_height != userdata->last_cbcr_height[field]) {
 108                 // We changed resolution since last use of this texture, so we need to create
 109                 // a new object. Note that this each card has its own PBOFrameAllocator,
 110                 // we don't need to worry about these flip-flopping between resolutions.
 111                 switch (userdata->pixel_format) {
 112                 case PixelFormat_10BitYCbCr:
 113                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 114                         check_error();
 115                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 116                         check_error();
 117                         break;
 118                 case PixelFormat_8BitYCbCr: {
 119                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 120                         check_error();
 121                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 122                         check_error();
 123                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 124                         check_error();
 125                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 126                         check_error();
 127                         break;
 128                 }
 129                 case PixelFormat_8BitYCbCrPlanar: {
 130                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 131                         check_error();
 132                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 133                         check_error();
 134                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 135                         check_error();
 136                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 137                         check_error();
 138                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 139                         check_error();
 140                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 141                         check_error();
 142                         break;
 143                 }
 144                 case PixelFormat_8BitBGRA:
 145                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 146                         check_error();
 147                         if (global_flags.can_disable_srgb_decoder) {  // See the comments in tweaked_inputs.h.
 148                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 149                         } else {
 150                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 151                         }
 152                         check_error();
 153                         break;
 154                 }
 155                 userdata->last_width[field] = width;
 156                 userdata->last_height[field] = height;
 157                 userdata->last_cbcr_width[field] = cbcr_width;
 158                 userdata->last_cbcr_height[field] = cbcr_height;
 159         }
 160         if (global_flags.ten_bit_input &&
 161             (first || v210_width != userdata->last_v210_width[field])) {
 162                 // Same as above; we need to recreate the texture.
 163                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 164                 check_error();
 165                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 166                 check_error();
 167                 userdata->last_v210_width[field] = v210_width;
 168         }
 169 }
 170
 171 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 172 {
 173         if (interlaced_stride) {
 174                 stride *= 2;
 175         }
 176         if (global_flags.flush_pbos) {
 177                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 178                 check_error();
 179         }
 180
 181         glBindTexture(GL_TEXTURE_2D, tex);
 182         check_error();
 183         if (interlaced_stride) {
 184                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 185                 check_error();
 186         } else {
 187                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 188                 check_error();
 189         }
 190
 191         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 192         check_error();
 193         glBindTexture(GL_TEXTURE_2D, 0);
 194         check_error();
 195         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 196         check_error();
 197 }
 198
 199 }  // namespace
 200
 201 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 202 {
 203         global_metrics.add("input_queue_length_frames", labels, &metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 204         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 205         global_metrics.add("input_queue_duped_frames", labels, &metric_input_duped_frames);
 206 }
 207
 208 void QueueLengthPolicy::update_policy(unsigned queue_length)
 209 {
 210         if (queue_length == 0) {  // Starvation.
 211                 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
 212                         ++safe_queue_length;
 213                         fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
 214                                 card_index, safe_queue_length);
 215                 }
 216                 frames_with_at_least_one = 0;
 217                 been_at_safe_point_since_last_starvation = false;
 218                 ++metric_input_duped_frames;
 219                 metric_input_queue_safe_length_frames = safe_queue_length;
 220                 metric_input_queue_length_frames = 0;
 221                 return;
 222         }
 223         if (queue_length >= safe_queue_length) {
 224                 been_at_safe_point_since_last_starvation = true;
 225         }
 226         if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
 227                 --safe_queue_length;
 228                 metric_input_queue_safe_length_frames = safe_queue_length;
 229                 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
 230                         card_index, safe_queue_length);
 231                 frames_with_at_least_one = 0;
 232         }
 233         metric_input_queue_length_frames = min(queue_length, safe_queue_length);  // The caller will drop frames for us if needed.
 234 }
 235
 236 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 237         : httpd(),
 238           num_cards(num_cards),
 239           mixer_surface(create_surface(format)),
 240           h264_encoder_surface(create_surface(format)),
 241           decklink_output_surface(create_surface(format)),
 242           audio_mixer(num_cards)
 243 {
 244         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 245         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 246         check_error();
 247
 248         // This nearly always should be true.
 249         global_flags.can_disable_srgb_decoder =
 250                 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
 251                 epoxy_has_gl_extension("GL_ARB_sampler_objects");
 252
 253         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 254         // will be halved when sampling them, and we need to compensate here.
 255         movit_texel_subpixel_precision /= 2.0;
 256
 257         resource_pool.reset(new ResourcePool);
 258         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 259                 output_channel[i].parent = this;
 260                 output_channel[i].channel = i;
 261         }
 262
 263         ImageFormat inout_format;
 264         inout_format.color_space = COLORSPACE_sRGB;
 265         inout_format.gamma_curve = GAMMA_sRGB;
 266
 267         // Matches the 4:2:0 format created by the main chain.
 268         YCbCrFormat ycbcr_format;
 269         ycbcr_format.chroma_subsampling_x = 2;
 270         ycbcr_format.chroma_subsampling_y = 2;
 271         if (global_flags.ycbcr_rec709_coefficients) {
 272                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 273         } else {
 274                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 275         }
 276         ycbcr_format.full_range = false;
 277         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 278         ycbcr_format.cb_x_position = 0.0f;
 279         ycbcr_format.cr_x_position = 0.0f;
 280         ycbcr_format.cb_y_position = 0.5f;
 281         ycbcr_format.cr_y_position = 0.5f;
 282
 283         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 284         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 285         check_error();
 286         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 287         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 288         display_chain->add_input(display_input);
 289         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 290         display_chain->set_dither_bits(0);  // Don't bother.
 291         display_chain->finalize();
 292
 293         video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, global_flags.width, global_flags.height, &httpd, global_disk_space_estimator));
 294
 295         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 296         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 297
 298         // Start listening for clients only once VideoEncoder has written its header, if any.
 299         httpd.start(9095);
 300
 301         // First try initializing the then PCI devices, then USB, then
 302         // fill up with fake cards until we have the desired number of cards.
 303         unsigned num_pci_devices = 0;
 304         unsigned card_index = 0;
 305
 306         {
 307                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 308                 if (decklink_iterator != nullptr) {
 309                         for ( ; card_index < num_cards; ++card_index) {
 310                                 IDeckLink *decklink;
 311                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 312                                         break;
 313                                 }
 314
 315                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 316                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 317                                 output->set_device(decklink);
 318                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 319                                 ++num_pci_devices;
 320                         }
 321                         decklink_iterator->Release();
 322                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 323                 } else {
 324                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 325                 }
 326         }
 327
 328         unsigned num_usb_devices = BMUSBCapture::num_cards();
 329         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 330                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 331                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 332                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 333         }
 334         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 335
 336         unsigned num_fake_cards = 0;
 337         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 338                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 339                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 340         }
 341
 342         if (num_fake_cards > 0) {
 343                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 344         }
 345
 346         // Initialize all video inputs the theme asked for. Note that these are
 347         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 348         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 349         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 350                 if (card_index >= MAX_VIDEO_CARDS) {
 351                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 352                         exit(1);
 353                 }
 354                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 355                 video_inputs[video_card_index]->set_card_index(card_index);
 356         }
 357         num_video_inputs = video_inputs.size();
 358
 359         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 360         BMUSBCapture::start_bm_thread();
 361
 362         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 363                 cards[card_index].queue_length_policy.reset(card_index);
 364         }
 365
 366         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 367
 368         if (global_flags.ten_bit_input) {
 369                 if (!v210Converter::has_hardware_support()) {
 370                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 371                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 372                         exit(1);
 373                 }
 374                 v210_converter.reset(new v210Converter());
 375
 376                 // These are all the widths listed in the Blackmagic SDK documentation
 377                 // (section 2.7.3, “Display Modes”).
 378                 v210_converter->precompile_shader(720);
 379                 v210_converter->precompile_shader(1280);
 380                 v210_converter->precompile_shader(1920);
 381                 v210_converter->precompile_shader(2048);
 382                 v210_converter->precompile_shader(3840);
 383                 v210_converter->precompile_shader(4096);
 384         }
 385         if (global_flags.ten_bit_output) {
 386                 if (!v210Converter::has_hardware_support()) {
 387                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 388                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 389                         exit(1);
 390                 }
 391         }
 392
 393         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 394         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 395         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 396
 397         if (global_flags.enable_alsa_output) {
 398                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 399         }
 400         if (global_flags.output_card != -1) {
 401                 desired_output_card_index = global_flags.output_card;
 402                 set_output_card_internal(global_flags.output_card);
 403         }
 404
 405         metric_start_time_seconds = get_timestamp_for_metrics();
 406
 407         global_metrics.add("frames_output_total", &metric_frames_output_total);
 408         global_metrics.add("frames_output_dropped", &metric_frames_output_dropped);
 409         global_metrics.add("start_time_seconds", &metric_start_time_seconds, Metrics::TYPE_GAUGE);
 410         global_metrics.add("memory_used_bytes", &metrics_memory_used_bytes);
 411         global_metrics.add("memory_locked_limit_bytes", &metrics_memory_locked_limit_bytes);
 412 }
 413
 414 Mixer::~Mixer()
 415 {
 416         BMUSBCapture::stop_bm_thread();
 417
 418         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 419                 {
 420                         unique_lock<mutex> lock(card_mutex);
 421                         cards[card_index].should_quit = true;  // Unblock thread.
 422                         cards[card_index].new_frames_changed.notify_all();
 423                 }
 424                 cards[card_index].capture->stop_dequeue_thread();
 425                 if (cards[card_index].output) {
 426                         cards[card_index].output->end_output();
 427                         cards[card_index].output.reset();
 428                 }
 429         }
 430
 431         video_encoder.reset(nullptr);
 432 }
 433
 434 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 435 {
 436         printf("Configuring card %d...\n", card_index);
 437
 438         CaptureCard *card = &cards[card_index];
 439         if (card->capture != nullptr) {
 440                 card->capture->stop_dequeue_thread();
 441         }
 442         card->capture.reset(capture);
 443         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 444         card->type = card_type;
 445         if (card->output.get() != output) {
 446                 card->output.reset(output);
 447         }
 448
 449         PixelFormat pixel_format;
 450         if (card_type == CardType::FFMPEG_INPUT) {
 451                 pixel_format = capture->get_current_pixel_format();
 452         } else if (global_flags.ten_bit_input) {
 453                 pixel_format = PixelFormat_10BitYCbCr;
 454         } else {
 455                 pixel_format = PixelFormat_8BitYCbCr;
 456         }
 457
 458         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 459         if (card->frame_allocator == nullptr) {
 460                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 461         }
 462         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 463         if (card->surface == nullptr) {
 464                 card->surface = create_surface_with_same_format(mixer_surface);
 465         }
 466         while (!card->new_frames.empty()) card->new_frames.pop_front();
 467         card->last_timecode = -1;
 468         card->capture->set_pixel_format(pixel_format);
 469         card->capture->configure_card();
 470
 471         // NOTE: start_bm_capture() happens in thread_func().
 472
 473         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 474         audio_mixer.reset_resampler(device);
 475         audio_mixer.set_display_name(device, card->capture->get_description());
 476         audio_mixer.trigger_state_changed_callback();
 477
 478         // Unregister old metrics, if any.
 479         if (!card->labels.empty()) {
 480                 const vector<pair<string, string>> &labels = card->labels;
 481                 global_metrics.remove("input_received_frames", labels);
 482                 global_metrics.remove("input_dropped_frames_jitter", labels);
 483                 global_metrics.remove("input_dropped_frames_error", labels);
 484                 global_metrics.remove("input_dropped_frames_resets", labels);
 485
 486                 global_metrics.remove("input_has_signal_bool", labels);
 487                 global_metrics.remove("input_is_connected_bool", labels);
 488                 global_metrics.remove("input_interlaced_bool", labels);
 489                 global_metrics.remove("input_width_pixels", labels);
 490                 global_metrics.remove("input_height_pixels", labels);
 491                 global_metrics.remove("input_frame_rate_nom", labels);
 492                 global_metrics.remove("input_frame_rate_den", labels);
 493                 global_metrics.remove("input_sample_rate_hz", labels);
 494         }
 495
 496         // Register metrics.
 497         vector<pair<string, string>> labels;
 498         char card_name[64];
 499         snprintf(card_name, sizeof(card_name), "%d", card_index);
 500         labels.emplace_back("card", card_name);
 501
 502         switch (card_type) {
 503         case CardType::LIVE_CARD:
 504                 labels.emplace_back("cardtype", "live");
 505                 break;
 506         case CardType::FAKE_CAPTURE:
 507                 labels.emplace_back("cardtype", "fake");
 508                 break;
 509         case CardType::FFMPEG_INPUT:
 510                 labels.emplace_back("cardtype", "ffmpeg");
 511                 break;
 512         default:
 513                 assert(false);
 514         }
 515         card->queue_length_policy.register_metrics(labels);
 516         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 517         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 518         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 519         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 520
 521         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 522         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 523         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 524         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 525         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 526         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 527         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 528         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 529         card->labels = labels;
 530 }
 531
 532 void Mixer::set_output_card_internal(int card_index)
 533 {
 534         // We don't really need to take card_mutex, since we're in the mixer
 535         // thread and don't mess with any queues (which is the only thing that happens
 536         // from other threads), but it's probably the safest in the long run.
 537         unique_lock<mutex> lock(card_mutex);
 538         if (output_card_index != -1) {
 539                 // Switch the old card from output to input.
 540                 CaptureCard *old_card = &cards[output_card_index];
 541                 old_card->output->end_output();
 542
 543                 // Stop the fake card that we put into place.
 544                 // This needs to _not_ happen under the mutex, to avoid deadlock
 545                 // (delivering the last frame needs to take the mutex).
 546                 CaptureInterface *fake_capture = old_card->capture.get();
 547                 lock.unlock();
 548                 fake_capture->stop_dequeue_thread();
 549                 lock.lock();
 550                 old_card->capture = move(old_card->parked_capture);
 551                 old_card->is_fake_capture = false;
 552                 old_card->capture->start_bm_capture();
 553         }
 554         if (card_index != -1) {
 555                 CaptureCard *card = &cards[card_index];
 556                 CaptureInterface *capture = card->capture.get();
 557                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 558                 // several seconds to complete (blocking on DisableVideoInput);
 559                 // see if we can maybe do it asynchronously.
 560                 lock.unlock();
 561                 capture->stop_dequeue_thread();
 562                 lock.lock();
 563                 card->parked_capture = move(card->capture);
 564                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 565                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 566                 card->queue_length_policy.reset(card_index);
 567                 card->capture->start_bm_capture();
 568                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 569                 card->output->start_output(desired_output_video_mode, pts_int);
 570         }
 571         output_card_index = card_index;
 572 }
 573
 574 namespace {
 575
 576 int unwrap_timecode(uint16_t current_wrapped, int last)
 577 {
 578         uint16_t last_wrapped = last & 0xffff;
 579         if (current_wrapped > last_wrapped) {
 580                 return (last & ~0xffff) | current_wrapped;
 581         } else {
 582                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 583         }
 584 }
 585
 586 }  // namespace
 587
 588 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 589                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 590                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 591 {
 592         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 593         CaptureCard *card = &cards[card_index];
 594
 595         ++card->metric_input_received_frames;
 596         card->metric_input_has_signal_bool = video_format.has_signal;
 597         card->metric_input_is_connected_bool = video_format.is_connected;
 598         card->metric_input_interlaced_bool = video_format.interlaced;
 599         card->metric_input_width_pixels = video_format.width;
 600         card->metric_input_height_pixels = video_format.height;
 601         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 602         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 603         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 604
 605         if (is_mode_scanning[card_index]) {
 606                 if (video_format.has_signal) {
 607                         // Found a stable signal, so stop scanning.
 608                         is_mode_scanning[card_index] = false;
 609                 } else {
 610                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 611                         steady_clock::time_point now = steady_clock::now();
 612                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 613                         if (sec_since_last_switch > switch_time_s) {
 614                                 // It isn't this mode; try the next one.
 615                                 mode_scanlist_index[card_index]++;
 616                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 617                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 618                                 last_mode_scan_change[card_index] = now;
 619                         }
 620                 }
 621         }
 622
 623         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 624         assert(frame_length > 0);
 625
 626         size_t num_samples = (audio_frame.len > audio_offset) ? (audio_frame.len - audio_offset) / audio_format.num_channels / (audio_format.bits_per_sample / 8) : 0;
 627         if (num_samples > OUTPUT_FREQUENCY / 10) {
 628                 printf("Card %d: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
 629                         card_index, int(audio_frame.len), int(audio_offset),
 630                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 631                 if (video_frame.owner) {
 632                         video_frame.owner->release_frame(video_frame);
 633                 }
 634                 if (audio_frame.owner) {
 635                         audio_frame.owner->release_frame(audio_frame);
 636                 }
 637                 return;
 638         }
 639
 640         int dropped_frames = 0;
 641         if (card->last_timecode != -1) {
 642                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 643         }
 644
 645         // Number of samples per frame if we need to insert silence.
 646         // (Could be nonintegral, but resampling will save us then.)
 647         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 648
 649         if (dropped_frames > MAX_FPS * 2) {
 650                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 651                         card_index, card->last_timecode, timecode);
 652                 audio_mixer.reset_resampler(device);
 653                 dropped_frames = 0;
 654                 ++card->metric_input_resets;
 655         } else if (dropped_frames > 0) {
 656                 // Insert silence as needed.
 657                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 658                         card_index, dropped_frames, timecode);
 659                 card->metric_input_dropped_frames_error += dropped_frames;
 660
 661                 bool success;
 662                 do {
 663                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 664                 } while (!success);
 665         }
 666
 667         audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 668
 669         // Done with the audio, so release it.
 670         if (audio_frame.owner) {
 671                 audio_frame.owner->release_frame(audio_frame);
 672         }
 673
 674         card->last_timecode = timecode;
 675
 676         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 677
 678         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 679         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 680         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 681                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 682                 assert(card->type == CardType::FFMPEG_INPUT);
 683                 assert(video_offset == 0);
 684                 expected_length = video_frame.len;
 685
 686                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 687                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 688                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 689                 cbcr_offset = video_format.width * video_format.height;
 690                 y_offset = 0;
 691         } else {
 692                 // All the other Y'CbCr formats are 4:2:2.
 693                 cbcr_width = video_format.width / 2;
 694                 cbcr_height = video_format.height;
 695                 cbcr_offset = video_offset / 2;
 696                 y_offset = video_frame.size / 2 + video_offset / 2;
 697         }
 698         if (video_frame.len - video_offset == 0 ||
 699             video_frame.len - video_offset != expected_length) {
 700                 if (video_frame.len != 0) {
 701                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 702                                 card_index, video_frame.len - video_offset, expected_length);
 703                 }
 704                 if (video_frame.owner) {
 705                         video_frame.owner->release_frame(video_frame);
 706                 }
 707
 708                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 709                 // so that pts can go up accordingly.
 710                 {
 711                         unique_lock<mutex> lock(card_mutex);
 712                         CaptureCard::NewFrame new_frame;
 713                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 714                         new_frame.length = frame_length;
 715                         new_frame.interlaced = false;
 716                         new_frame.dropped_frames = dropped_frames;
 717                         new_frame.received_timestamp = video_frame.received_timestamp;
 718                         card->new_frames.push_back(move(new_frame));
 719                         card->new_frames_changed.notify_all();
 720                 }
 721                 return;
 722         }
 723
 724         unsigned num_fields = video_format.interlaced ? 2 : 1;
 725         steady_clock::time_point frame_upload_start;
 726         bool interlaced_stride = false;
 727         if (video_format.interlaced) {
 728                 // Send the two fields along as separate frames; the other side will need to add
 729                 // a deinterlacer to actually get this right.
 730                 assert(video_format.height % 2 == 0);
 731                 video_format.height /= 2;
 732                 cbcr_height /= 2;
 733                 assert(frame_length % 2 == 0);
 734                 frame_length /= 2;
 735                 num_fields = 2;
 736                 if (video_format.second_field_start == 1) {
 737                         interlaced_stride = true;
 738                 }
 739                 frame_upload_start = steady_clock::now();
 740         }
 741         userdata->last_interlaced = video_format.interlaced;
 742         userdata->last_has_signal = video_format.has_signal;
 743         userdata->last_is_connected = video_format.is_connected;
 744         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 745         userdata->last_frame_rate_den = video_format.frame_rate_den;
 746         RefCountedFrame frame(video_frame);
 747
 748         // Upload the textures.
 749         for (unsigned field = 0; field < num_fields; ++field) {
 750                 // Put the actual texture upload in a lambda that is executed in the main thread.
 751                 // It is entirely possible to do this in the same thread (and it might even be
 752                 // faster, depending on the GPU and driver), but it appears to be trickling
 753                 // driver bugs very easily.
 754                 //
 755                 // Note that this means we must hold on to the actual frame data in <userdata>
 756                 // until the upload command is run, but we hold on to <frame> much longer than that
 757                 // (in fact, all the way until we no longer use the texture in rendering).
 758                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 759                         unsigned field_start_line;
 760                         if (field == 1) {
 761                                 field_start_line = video_format.second_field_start;
 762                         } else {
 763                                 field_start_line = video_format.extra_lines_top;
 764                         }
 765
 766                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 767                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 768                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 769
 770                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 771                         check_error();
 772
 773                         switch (userdata->pixel_format) {
 774                         case PixelFormat_10BitYCbCr: {
 775                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 776                                 upload_texture(userdata->tex_v210[field], v210_width, video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, field_start);
 777                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 778                                 break;
 779                         }
 780                         case PixelFormat_8BitYCbCr: {
 781                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 782                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 783
 784                                 // Make up our own strides, since we are interleaving.
 785                                 upload_texture(userdata->tex_y[field], video_format.width, video_format.height, video_format.width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_y_start);
 786                                 upload_texture(userdata->tex_cbcr[field], cbcr_width, cbcr_height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
 787                                 break;
 788                         }
 789                         case PixelFormat_8BitYCbCrPlanar: {
 790                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 791                                 size_t field_y_start = y_offset;
 792                                 size_t field_cb_start = cbcr_offset;
 793                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 794
 795                                 // Make up our own strides, since we are interleaving.
 796                                 upload_texture(userdata->tex_y[field], video_format.width, video_format.height, video_format.width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_y_start);
 797                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 798                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 799                                 break;
 800                         }
 801                         case PixelFormat_8BitBGRA: {
 802                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 803                                 upload_texture(userdata->tex_rgba[field], video_format.width, video_format.height, video_format.stride, interlaced_stride, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, field_start);
 804                                 // These could be asked to deliver mipmaps at any time.
 805                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 806                                 check_error();
 807                                 glGenerateMipmap(GL_TEXTURE_2D);
 808                                 check_error();
 809                                 glBindTexture(GL_TEXTURE_2D, 0);
 810                                 check_error();
 811                                 break;
 812                         }
 813                         default:
 814                                 assert(false);
 815                         }
 816
 817                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 818                         check_error();
 819                 };
 820
 821                 if (field == 1) {
 822                         // Don't upload the second field as fast as we can; wait until
 823                         // the field time has approximately passed. (Otherwise, we could
 824                         // get timing jitter against the other sources, and possibly also
 825                         // against the video display, although the latter is not as critical.)
 826                         // This requires our system clock to be reasonably close to the
 827                         // video clock, but that's not an unreasonable assumption.
 828                         steady_clock::time_point second_field_start = frame_upload_start +
 829                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 830                         this_thread::sleep_until(second_field_start);
 831                 }
 832
 833                 {
 834                         unique_lock<mutex> lock(card_mutex);
 835                         CaptureCard::NewFrame new_frame;
 836                         new_frame.frame = frame;
 837                         new_frame.length = frame_length;
 838                         new_frame.field = field;
 839                         new_frame.interlaced = video_format.interlaced;
 840                         new_frame.upload_func = upload_func;
 841                         new_frame.dropped_frames = dropped_frames;
 842                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 843                         card->new_frames.push_back(move(new_frame));
 844                         card->new_frames_changed.notify_all();
 845                 }
 846         }
 847 }
 848
 849 void Mixer::bm_hotplug_add(libusb_device *dev)
 850 {
 851         lock_guard<mutex> lock(hotplug_mutex);
 852         hotplugged_cards.push_back(dev);
 853 }
 854
 855 void Mixer::bm_hotplug_remove(unsigned card_index)
 856 {
 857         cards[card_index].new_frames_changed.notify_all();
 858 }
 859
 860 void Mixer::thread_func()
 861 {
 862         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 863
 864         eglBindAPI(EGL_OPENGL_API);
 865         QOpenGLContext *context = create_context(mixer_surface);
 866         if (!make_current(context, mixer_surface)) {
 867                 printf("oops\n");
 868                 exit(1);
 869         }
 870
 871         // Start the actual capture. (We don't want to do it before we're actually ready
 872         // to process output frames.)
 873         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 874                 if (int(card_index) != output_card_index) {
 875                         cards[card_index].capture->start_bm_capture();
 876                 }
 877         }
 878
 879         steady_clock::time_point start, now;
 880         start = steady_clock::now();
 881
 882         int stats_dropped_frames = 0;
 883
 884         while (!should_quit) {
 885                 if (desired_output_card_index != output_card_index) {
 886                         set_output_card_internal(desired_output_card_index);
 887                 }
 888                 if (output_card_index != -1 &&
 889                     desired_output_video_mode != output_video_mode) {
 890                         DeckLinkOutput *output = cards[output_card_index].output.get();
 891                         output->end_output();
 892                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 893                         output->start_output(desired_output_video_mode, pts_int);
 894                 }
 895
 896                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 897                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 898
 899                 bool master_card_is_output;
 900                 unsigned master_card_index;
 901                 if (output_card_index != -1) {
 902                         master_card_is_output = true;
 903                         master_card_index = output_card_index;
 904                 } else {
 905                         master_card_is_output = false;
 906                         master_card_index = theme->map_signal(master_clock_channel);
 907                         assert(master_card_index < num_cards);
 908                 }
 909
 910                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
 911                 schedule_audio_resampling_tasks(output_frame_info.dropped_frames, output_frame_info.num_samples, output_frame_info.frame_duration, output_frame_info.is_preroll, output_frame_info.frame_timestamp);
 912                 stats_dropped_frames += output_frame_info.dropped_frames;
 913
 914                 handle_hotplugged_cards();
 915
 916                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 917                         if (card_index == master_card_index || !has_new_frame[card_index]) {
 918                                 continue;
 919                         }
 920                         if (new_frames[card_index].frame->len == 0) {
 921                                 ++new_frames[card_index].dropped_frames;
 922                         }
 923                         if (new_frames[card_index].dropped_frames > 0) {
 924                                 printf("Card %u dropped %d frames before this\n",
 925                                         card_index, int(new_frames[card_index].dropped_frames));
 926                         }
 927                 }
 928
 929                 // If the first card is reporting a corrupted or otherwise dropped frame,
 930                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 931                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
 932                         ++stats_dropped_frames;
 933                         pts_int += new_frames[master_card_index].length;
 934                         continue;
 935                 }
 936
 937                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 938                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
 939                                 continue;
 940
 941                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
 942                         assert(new_frame->frame != nullptr);
 943                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
 944                         check_error();
 945
 946                         // The new texture might need uploading before use.
 947                         if (new_frame->upload_func) {
 948                                 new_frame->upload_func();
 949                                 new_frame->upload_func = nullptr;
 950                         }
 951                 }
 952
 953                 int64_t frame_duration = output_frame_info.frame_duration;
 954                 render_one_frame(frame_duration);
 955                 ++frame_num;
 956                 pts_int += frame_duration;
 957
 958                 now = steady_clock::now();
 959                 double elapsed = duration<double>(now - start).count();
 960
 961                 metric_frames_output_total = frame_num;
 962                 metric_frames_output_dropped = stats_dropped_frames;
 963
 964                 if (frame_num % 100 == 0) {
 965                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
 966                                 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
 967                                 1e3 * elapsed / frame_num);
 968                 //      chain->print_phase_timing();
 969
 970                         // Check our memory usage, to see if we are close to our mlockall()
 971                         // limit (if at all set).
 972                         rusage used;
 973                         if (getrusage(RUSAGE_SELF, &used) == -1) {
 974                                 perror("getrusage(RUSAGE_SELF)");
 975                                 assert(false);
 976                         }
 977
 978                         if (uses_mlock) {
 979                                 rlimit limit;
 980                                 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
 981                                         perror("getrlimit(RLIMIT_MEMLOCK)");
 982                                         assert(false);
 983                                 }
 984
 985                                 if (limit.rlim_cur == 0) {
 986                                         printf(", using %ld MB memory (locked)",
 987                                                 long(used.ru_maxrss / 1024));
 988                                 } else {
 989                                         printf(", using %ld / %ld MB lockable memory (%.1f%%)",
 990                                                 long(used.ru_maxrss / 1024),
 991                                                 long(limit.rlim_cur / 1048576),
 992                                                 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
 993                                 }
 994                                 metrics_memory_locked_limit_bytes = limit.rlim_cur;
 995                         } else {
 996                                 printf(", using %ld MB memory (not locked)",
 997                                         long(used.ru_maxrss / 1024));
 998                                 metrics_memory_locked_limit_bytes = 0.0 / 0.0;
 999                         }
1000
1001                         printf("\n");
1002
1003                         metrics_memory_used_bytes = used.ru_maxrss * 1024;
1004                 }
1005
1006
1007                 if (should_cut.exchange(false)) {  // Test and clear.
1008                         video_encoder->do_cut(frame_num);
1009                 }
1010
1011 #if 0
1012                 // Reset every 100 frames, so that local variations in frame times
1013                 // (especially for the first few frames, when the shaders are
1014                 // compiled etc.) don't make it hard to measure for the entire
1015                 // remaining duration of the program.
1016                 if (frame == 10000) {
1017                         frame = 0;
1018                         start = now;
1019                 }
1020 #endif
1021                 check_error();
1022         }
1023
1024         resource_pool->clean_context();
1025 }
1026
1027 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1028 {
1029         if (output_card_index != -1) {
1030                 // The output card (ie., cards[output_card_index].output) is the master clock,
1031                 // so no input card (ie., cards[card_index].capture) is.
1032                 return false;
1033         }
1034         return (card_index == master_card_index);
1035 }
1036
1037 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
1038 {
1039         // Count the number of frames in the queue, including any frames
1040         // we dropped. It's hard to know exactly how we should deal with
1041         // dropped (corrupted) input frames; they don't help our goal of
1042         // avoiding starvation, but they still add to the problem of latency.
1043         // Since dropped frames is going to mean a bump in the signal anyway,
1044         // we err on the side of having more stable latency instead.
1045         unsigned queue_length = 0;
1046         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1047                 queue_length += frame.dropped_frames + 1;
1048         }
1049         card->queue_length_policy.update_policy(queue_length);
1050
1051         // If needed, drop frames until the queue is below the safe limit.
1052         // We prefer to drop from the head, because all else being equal,
1053         // we'd like more recent frames (less latency).
1054         unsigned dropped_frames = 0;
1055         while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
1056                 assert(!card->new_frames.empty());
1057                 assert(queue_length > card->new_frames.front().dropped_frames);
1058                 queue_length -= card->new_frames.front().dropped_frames;
1059
1060                 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
1061                         // No need to drop anything.
1062                         break;
1063                 }
1064
1065                 card->new_frames.pop_front();
1066                 card->new_frames_changed.notify_all();
1067                 --queue_length;
1068                 ++dropped_frames;
1069         }
1070
1071         card->metric_input_dropped_frames_jitter += dropped_frames;
1072
1073 #if 0
1074         if (dropped_frames > 0) {
1075                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1076                         card_index, dropped_frames);
1077         }
1078 #endif
1079 }
1080
1081
1082 Mixer::OutputFrameInfo Mixer::get_one_frame_from_each_card(unsigned master_card_index, bool master_card_is_output, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS])
1083 {
1084         OutputFrameInfo output_frame_info;
1085 start:
1086         unique_lock<mutex> lock(card_mutex, defer_lock);
1087         if (master_card_is_output) {
1088                 // Clocked to the output, so wait for it to be ready for the next frame.
1089                 cards[master_card_index].output->wait_for_frame(pts_int, &output_frame_info.dropped_frames, &output_frame_info.frame_duration, &output_frame_info.is_preroll, &output_frame_info.frame_timestamp);
1090                 lock.lock();
1091         } else {
1092                 // Wait for the master card to have a new frame.
1093                 // TODO: Add a timeout.
1094                 output_frame_info.is_preroll = false;
1095                 lock.lock();
1096                 cards[master_card_index].new_frames_changed.wait(lock, [this, master_card_index]{ return !cards[master_card_index].new_frames.empty() || cards[master_card_index].capture->get_disconnected(); });
1097         }
1098
1099         if (master_card_is_output) {
1100                 handle_hotplugged_cards();
1101         } else if (cards[master_card_index].new_frames.empty()) {
1102                 // We were woken up, but not due to a new frame. Deal with it
1103                 // and then restart.
1104                 assert(cards[master_card_index].capture->get_disconnected());
1105                 handle_hotplugged_cards();
1106                 lock.unlock();
1107                 goto start;
1108         }
1109
1110         if (!master_card_is_output) {
1111                 output_frame_info.frame_timestamp =
1112                         cards[master_card_index].new_frames.front().received_timestamp;
1113         }
1114
1115         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1116                 CaptureCard *card = &cards[card_index];
1117                 if (input_card_is_master_clock(card_index, master_card_index)) {
1118                         // We don't use the queue length policy for the master card,
1119                         // but we will if it stops being the master. Thus, clear out
1120                         // the policy in case we switch in the future.
1121                         card->queue_length_policy.reset(card_index);
1122                         assert(!card->new_frames.empty());
1123                 } else {
1124                         trim_queue(card, card_index);
1125                 }
1126                 if (!card->new_frames.empty()) {
1127                         new_frames[card_index] = move(card->new_frames.front());
1128                         has_new_frame[card_index] = true;
1129                         card->new_frames.pop_front();
1130                         card->new_frames_changed.notify_all();
1131                 }
1132         }
1133
1134         if (!master_card_is_output) {
1135                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1136                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1137         }
1138
1139         // This might get off by a fractional sample when changing master card
1140         // between ones with different frame rates, but that's fine.
1141         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1142         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1143         fractional_samples = num_samples_times_timebase % TIMEBASE;
1144         assert(output_frame_info.num_samples >= 0);
1145
1146         return output_frame_info;
1147 }
1148
1149 void Mixer::handle_hotplugged_cards()
1150 {
1151         // Check for cards that have been disconnected since last frame.
1152         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1153                 CaptureCard *card = &cards[card_index];
1154                 if (card->capture->get_disconnected()) {
1155                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1156                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1157                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1158                         card->queue_length_policy.reset(card_index);
1159                         card->capture->start_bm_capture();
1160                 }
1161         }
1162
1163         // Check for cards that have been connected since last frame.
1164         vector<libusb_device *> hotplugged_cards_copy;
1165         {
1166                 lock_guard<mutex> lock(hotplug_mutex);
1167                 swap(hotplugged_cards, hotplugged_cards_copy);
1168         }
1169         for (libusb_device *new_dev : hotplugged_cards_copy) {
1170                 // Look for a fake capture card where we can stick this in.
1171                 int free_card_index = -1;
1172                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1173                         if (cards[card_index].is_fake_capture) {
1174                                 free_card_index = card_index;
1175                                 break;
1176                         }
1177                 }
1178
1179                 if (free_card_index == -1) {
1180                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1181                         libusb_unref_device(new_dev);
1182                 } else {
1183                         // BMUSBCapture takes ownership.
1184                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1185                         CaptureCard *card = &cards[free_card_index];
1186                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1187                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1188                         card->queue_length_policy.reset(free_card_index);
1189                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1190                         capture->start_bm_capture();
1191                 }
1192         }
1193 }
1194
1195
1196 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame, bool is_preroll, steady_clock::time_point frame_timestamp)
1197 {
1198         // Resample the audio as needed, including from previously dropped frames.
1199         assert(num_cards > 0);
1200         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1201                 const bool dropped_frame = (frame_num != dropped_frames);
1202                 {
1203                         // Signal to the audio thread to process this frame.
1204                         // Note that if the frame is a dropped frame, we signal that
1205                         // we don't want to use this frame as base for adjusting
1206                         // the resampler rate. The reason for this is that the timing
1207                         // of these frames is often way too late; they typically don't
1208                         // “arrive” before we synthesize them. Thus, we could end up
1209                         // in a situation where we have inserted e.g. five audio frames
1210                         // into the queue before we then start pulling five of them
1211                         // back out. This makes ResamplingQueue overestimate the delay,
1212                         // causing undue resampler changes. (We _do_ use the last,
1213                         // non-dropped frame; perhaps we should just discard that as well,
1214                         // since dropped frames are expected to be rare, and it might be
1215                         // better to just wait until we have a slightly more normal situation).
1216                         unique_lock<mutex> lock(audio_mutex);
1217                         bool adjust_rate = !dropped_frame && !is_preroll;
1218                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1219                         audio_task_queue_changed.notify_one();
1220                 }
1221                 if (dropped_frame) {
1222                         // For dropped frames, increase the pts. Note that if the format changed
1223                         // in the meantime, we have no way of detecting that; we just have to
1224                         // assume the frame length is always the same.
1225                         pts_int += length_per_frame;
1226                 }
1227         }
1228 }
1229
1230 void Mixer::render_one_frame(int64_t duration)
1231 {
1232         // Determine the time code for this frame before we start rendering.
1233         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1234         if (display_timecode_on_stdout) {
1235                 printf("Timecode: '%s'\n", timecode_text.c_str());
1236         }
1237
1238         // Update Y'CbCr settings for all cards.
1239         {
1240                 unique_lock<mutex> lock(card_mutex);
1241                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1242                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1243                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1244                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1245                         input_state.full_range[card_index] = interpretation->full_range;
1246                 }
1247         }
1248
1249         // Get the main chain from the theme, and set its state immediately.
1250         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1251         EffectChain *chain = theme_main_chain.chain;
1252         theme_main_chain.setup_chain();
1253         //theme_main_chain.chain->enable_phase_timing(true);
1254
1255         // The theme can't (or at least shouldn't!) call connect_signal() on
1256         // each FFmpeg input, so we'll do it here.
1257         for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1258                 conn.first->connect_signal_raw(conn.second->get_card_index());
1259         }
1260
1261         // If HDMI/SDI output is active and the user has requested auto mode,
1262         // its mode overrides the existing Y'CbCr setting for the chain.
1263         YCbCrLumaCoefficients ycbcr_output_coefficients;
1264         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1265                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1266         } else {
1267                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1268         }
1269
1270         // TODO: Reduce the duplication against theme.cpp.
1271         YCbCrFormat output_ycbcr_format;
1272         output_ycbcr_format.chroma_subsampling_x = 1;
1273         output_ycbcr_format.chroma_subsampling_y = 1;
1274         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1275         output_ycbcr_format.full_range = false;
1276         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1277         chain->change_ycbcr_output_format(output_ycbcr_format);
1278
1279         // Render main chain. If we're using zerocopy Quick Sync encoding
1280         // (the default case), we take an extra copy of the created outputs,
1281         // so that we can display it back to the screen later (it's less memory
1282         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1283         // Ideally, we'd like to avoid taking copies and just use the main textures
1284         // for display as well, but they're just views into VA-API memory and must be
1285         // unmapped during encoding, so we can't use them for display, unfortunately.
1286         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1287         GLuint y_copy_tex, cbcr_copy_tex = 0;
1288         GLuint y_display_tex, cbcr_display_tex;
1289         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1290         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1291         const bool is_zerocopy = video_encoder->is_zerocopy();
1292         if (is_zerocopy) {
1293                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1294                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1295                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1296
1297                 y_display_tex = y_copy_tex;
1298                 cbcr_display_tex = cbcr_copy_tex;
1299
1300                 // y_tex and cbcr_tex will be given by VideoEncoder.
1301         } else {
1302                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1303                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1304                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1305
1306                 y_display_tex = y_tex;
1307                 cbcr_display_tex = cbcr_tex;
1308         }
1309
1310         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1311         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1312         assert(got_frame);
1313
1314         GLuint fbo;
1315         if (is_zerocopy) {
1316                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1317         } else {
1318                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1319         }
1320         check_error();
1321         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1322
1323         if (display_timecode_in_stream) {
1324                 // Render the timecode on top.
1325                 timecode_renderer->render_timecode(fbo, timecode_text);
1326         }
1327
1328         resource_pool->release_fbo(fbo);
1329
1330         if (is_zerocopy) {
1331                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1332         } else {
1333                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1334         }
1335         if (output_card_index != -1) {
1336                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1337         }
1338         resource_pool->release_2d_texture(cbcr_full_tex);
1339
1340         // Set the right state for the Y' and CbCr textures we use for display.
1341         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1342         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1343         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1344         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1345         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1346
1347         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1348         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1349         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1350         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1351
1352         RefCountedGLsync fence = video_encoder->end_frame();
1353
1354         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1355         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1356         DisplayFrame live_frame;
1357         live_frame.chain = display_chain.get();
1358         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1359                 display_input->set_texture_num(0, y_display_tex);
1360                 display_input->set_texture_num(1, cbcr_display_tex);
1361         };
1362         live_frame.ready_fence = fence;
1363         live_frame.input_frames = {};
1364         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1365         output_channel[OUTPUT_LIVE].output_frame(live_frame);
1366
1367         // Set up preview and any additional channels.
1368         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1369                 DisplayFrame display_frame;
1370                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1371                 display_frame.chain = chain.chain;
1372                 display_frame.setup_chain = chain.setup_chain;
1373                 display_frame.ready_fence = fence;
1374                 display_frame.input_frames = chain.input_frames;
1375                 display_frame.temp_textures = {};
1376                 output_channel[i].output_frame(display_frame);
1377         }
1378 }
1379
1380 void Mixer::audio_thread_func()
1381 {
1382         pthread_setname_np(pthread_self(), "Mixer_Audio");
1383
1384         while (!should_quit) {
1385                 AudioTask task;
1386
1387                 {
1388                         unique_lock<mutex> lock(audio_mutex);
1389                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1390                         if (should_quit) {
1391                                 return;
1392                         }
1393                         task = audio_task_queue.front();
1394                         audio_task_queue.pop();
1395                 }
1396
1397                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1398                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1399                 vector<float> samples_out = audio_mixer.get_output(
1400                         task.frame_timestamp,
1401                         task.num_samples,
1402                         rate_adjustment_policy);
1403
1404                 // Send the samples to the sound card, then add them to the output.
1405                 if (alsa) {
1406                         alsa->write(samples_out);
1407                 }
1408                 if (output_card_index != -1) {
1409                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1410                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1411                 }
1412                 video_encoder->add_audio(task.pts_int, move(samples_out));
1413         }
1414 }
1415
1416 void Mixer::release_display_frame(DisplayFrame *frame)
1417 {
1418         for (GLuint texnum : frame->temp_textures) {
1419                 resource_pool->release_2d_texture(texnum);
1420         }
1421         frame->temp_textures.clear();
1422         frame->ready_fence.reset();
1423         frame->input_frames.clear();
1424 }
1425
1426 void Mixer::start()
1427 {
1428         mixer_thread = thread(&Mixer::thread_func, this);
1429         audio_thread = thread(&Mixer::audio_thread_func, this);
1430 }
1431
1432 void Mixer::quit()
1433 {
1434         should_quit = true;
1435         audio_task_queue_changed.notify_one();
1436         mixer_thread.join();
1437         audio_thread.join();
1438 }
1439
1440 void Mixer::transition_clicked(int transition_num)
1441 {
1442         theme->transition_clicked(transition_num, pts());
1443 }
1444
1445 void Mixer::channel_clicked(int preview_num)
1446 {
1447         theme->channel_clicked(preview_num);
1448 }
1449
1450 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1451 {
1452         unique_lock<mutex> lock(card_mutex);
1453         return ycbcr_interpretation[card_index];
1454 }
1455
1456 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1457 {
1458         unique_lock<mutex> lock(card_mutex);
1459         ycbcr_interpretation[card_index] = interpretation;
1460 }
1461
1462 void Mixer::start_mode_scanning(unsigned card_index)
1463 {
1464         assert(card_index < num_cards);
1465         if (is_mode_scanning[card_index]) {
1466                 return;
1467         }
1468         is_mode_scanning[card_index] = true;
1469         mode_scanlist[card_index].clear();
1470         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1471                 mode_scanlist[card_index].push_back(mode.first);
1472         }
1473         assert(!mode_scanlist[card_index].empty());
1474         mode_scanlist_index[card_index] = 0;
1475         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1476         last_mode_scan_change[card_index] = steady_clock::now();
1477 }
1478
1479 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1480 {
1481         assert(desired_output_card_index != -1);
1482         unique_lock<mutex> lock(card_mutex);
1483         return cards[desired_output_card_index].output->get_available_video_modes();
1484 }
1485
1486 Mixer::OutputChannel::~OutputChannel()
1487 {
1488         if (has_current_frame) {
1489                 parent->release_display_frame(&current_frame);
1490         }
1491         if (has_ready_frame) {
1492                 parent->release_display_frame(&ready_frame);
1493         }
1494 }
1495
1496 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1497 {
1498         // Store this frame for display. Remove the ready frame if any
1499         // (it was seemingly never used).
1500         {
1501                 unique_lock<mutex> lock(frame_mutex);
1502                 if (has_ready_frame) {
1503                         parent->release_display_frame(&ready_frame);
1504                 }
1505                 ready_frame = frame;
1506                 has_ready_frame = true;
1507
1508                 // Call the callbacks under the mutex (they should be short),
1509                 // so that we don't race against a callback removal.
1510                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1511                         key_and_callback.second();
1512                 }
1513         }
1514
1515         // Reduce the number of callbacks by filtering duplicates. The reason
1516         // why we bother doing this is that Qt seemingly can get into a state
1517         // where its builds up an essentially unbounded queue of signals,
1518         // consuming more and more memory, and there's no good way of collapsing
1519         // user-defined signals or limiting the length of the queue.
1520         if (transition_names_updated_callback) {
1521                 vector<string> transition_names = global_mixer->get_transition_names();
1522                 bool changed = false;
1523                 if (transition_names.size() != last_transition_names.size()) {
1524                         changed = true;
1525                 } else {
1526                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1527                                 if (transition_names[i] != last_transition_names[i]) {
1528                                         changed = true;
1529                                         break;
1530                                 }
1531                         }
1532                 }
1533                 if (changed) {
1534                         transition_names_updated_callback(transition_names);
1535                         last_transition_names = transition_names;
1536                 }
1537         }
1538         if (name_updated_callback) {
1539                 string name = global_mixer->get_channel_name(channel);
1540                 if (name != last_name) {
1541                         name_updated_callback(name);
1542                         last_name = name;
1543                 }
1544         }
1545         if (color_updated_callback) {
1546                 string color = global_mixer->get_channel_color(channel);
1547                 if (color != last_color) {
1548                         color_updated_callback(color);
1549                         last_color = color;
1550                 }
1551         }
1552 }
1553
1554 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1555 {
1556         unique_lock<mutex> lock(frame_mutex);
1557         if (!has_current_frame && !has_ready_frame) {
1558                 return false;
1559         }
1560
1561         if (has_current_frame && has_ready_frame) {
1562                 // We have a new ready frame. Toss the current one.
1563                 parent->release_display_frame(&current_frame);
1564                 has_current_frame = false;
1565         }
1566         if (has_ready_frame) {
1567                 assert(!has_current_frame);
1568                 current_frame = ready_frame;
1569                 ready_frame.ready_fence.reset();  // Drop the refcount.
1570                 ready_frame.input_frames.clear();  // Drop the refcounts.
1571                 has_current_frame = true;
1572                 has_ready_frame = false;
1573         }
1574
1575         *frame = current_frame;
1576         return true;
1577 }
1578
1579 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1580 {
1581         unique_lock<mutex> lock(frame_mutex);
1582         new_frame_ready_callbacks[key] = callback;
1583 }
1584
1585 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1586 {
1587         unique_lock<mutex> lock(frame_mutex);
1588         new_frame_ready_callbacks.erase(key);
1589 }
1590
1591 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1592 {
1593         transition_names_updated_callback = callback;
1594 }
1595
1596 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1597 {
1598         name_updated_callback = callback;
1599 }
1600
1601 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1602 {
1603         color_updated_callback = callback;
1604 }
1605
1606 mutex RefCountedGLsync::fence_lock;