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 <algorithm>
  18 #include <chrono>
  19 #include <condition_variable>
  20 #include <cstddef>
  21 #include <cstdint>
  22 #include <memory>
  23 #include <mutex>
  24 #include <ratio>
  25 #include <string>
  26 #include <thread>
  27 #include <utility>
  28 #include <vector>
  29
  30 #include "DeckLinkAPI.h"
  31 #include "LinuxCOM.h"
  32 #include "alsa_output.h"
  33 #include "basic_stats.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
  65 namespace {
  66
  67 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  68 {
  69         if (interlaced) {
  70                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  71                         input_state->buffered_frames[card_index][frame_num] =
  72                                 input_state->buffered_frames[card_index][frame_num - 1];
  73                 }
  74                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  75         } else {
  76                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  77                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  78                 }
  79         }
  80 }
  81
  82 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
  83 {
  84         bool first;
  85         switch (userdata->pixel_format) {
  86         case PixelFormat_10BitYCbCr:
  87                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  88                 break;
  89         case PixelFormat_8BitYCbCr:
  90                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
  91                 break;
  92         case PixelFormat_8BitBGRA:
  93                 first = userdata->tex_rgba[field] == 0;
  94                 break;
  95         case PixelFormat_8BitYCbCrPlanar:
  96                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
  97                 break;
  98         default:
  99                 assert(false);
 100         }
 101
 102         if (first ||
 103             width != userdata->last_width[field] ||
 104             height != userdata->last_height[field] ||
 105             cbcr_width != userdata->last_cbcr_width[field] ||
 106             cbcr_height != userdata->last_cbcr_height[field]) {
 107                 // We changed resolution since last use of this texture, so we need to create
 108                 // a new object. Note that this each card has its own PBOFrameAllocator,
 109                 // we don't need to worry about these flip-flopping between resolutions.
 110                 switch (userdata->pixel_format) {
 111                 case PixelFormat_10BitYCbCr:
 112                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 113                         check_error();
 114                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 115                         check_error();
 116                         break;
 117                 case PixelFormat_8BitYCbCr: {
 118                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 119                         check_error();
 120                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 121                         check_error();
 122                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 123                         check_error();
 124                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 125                         check_error();
 126                         break;
 127                 }
 128                 case PixelFormat_8BitYCbCrPlanar: {
 129                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 130                         check_error();
 131                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 132                         check_error();
 133                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 134                         check_error();
 135                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 136                         check_error();
 137                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 138                         check_error();
 139                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 140                         check_error();
 141                         break;
 142                 }
 143                 case PixelFormat_8BitBGRA:
 144                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 145                         check_error();
 146                         if (global_flags.can_disable_srgb_decoder) {  // See the comments in tweaked_inputs.h.
 147                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 148                         } else {
 149                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 150                         }
 151                         check_error();
 152                         break;
 153                 }
 154                 userdata->last_width[field] = width;
 155                 userdata->last_height[field] = height;
 156                 userdata->last_cbcr_width[field] = cbcr_width;
 157                 userdata->last_cbcr_height[field] = cbcr_height;
 158         }
 159         if (global_flags.ten_bit_input &&
 160             (first || v210_width != userdata->last_v210_width[field])) {
 161                 // Same as above; we need to recreate the texture.
 162                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 163                 check_error();
 164                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 165                 check_error();
 166                 userdata->last_v210_width[field] = v210_width;
 167         }
 168 }
 169
 170 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 171 {
 172         if (interlaced_stride) {
 173                 stride *= 2;
 174         }
 175         if (global_flags.flush_pbos) {
 176                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 177                 check_error();
 178         }
 179
 180         glBindTexture(GL_TEXTURE_2D, tex);
 181         check_error();
 182         if (interlaced_stride) {
 183                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 184                 check_error();
 185         } else {
 186                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 187                 check_error();
 188         }
 189
 190         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 191         check_error();
 192         glBindTexture(GL_TEXTURE_2D, 0);
 193         check_error();
 194         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 195         check_error();
 196 }
 197
 198 }  // namespace
 199
 200 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 201 {
 202         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 203         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 204 }
 205
 206 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 207 {
 208         global_metrics.remove("input_underestimated_jitter_frames", labels);
 209         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 210 }
 211
 212 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 213 {
 214         if (expected_timestamp > steady_clock::time_point::min()) {
 215                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 216                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 217                 history.push_back(orders.insert(jitter_seconds));
 218                 if (jitter_seconds > estimate_max_jitter()) {
 219                         ++metric_input_underestimated_jitter_frames;
 220                 }
 221
 222                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 223
 224                 if (history.size() > history_length) {
 225                         orders.erase(history.front());
 226                         history.pop_front();
 227                 }
 228                 assert(history.size() <= history_length);
 229         }
 230         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 231 }
 232
 233 double JitterHistory::estimate_max_jitter() const
 234 {
 235         if (orders.empty()) {
 236                 return 0.0;
 237         }
 238         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 239         if (percentile <= 0.5) {
 240                 return *next(orders.begin(), elem_idx) * multiplier;
 241         } else {
 242                 return *prev(orders.end(), elem_idx + 1) * multiplier;
 243         }
 244 }
 245
 246 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 247 {
 248         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 249 }
 250
 251 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 252 {
 253         global_metrics.remove("input_queue_safe_length_frames", labels);
 254 }
 255
 256 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 257                                       steady_clock::time_point expected_next_frame,
 258                                       int64_t input_frame_duration,
 259                                       int64_t master_frame_duration,
 260                                       double max_input_card_jitter_seconds,
 261                                       double max_master_card_jitter_seconds)
 262 {
 263         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 264         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 265
 266         // Figure out when we can expect the next frame for this card, assuming
 267         // worst-case jitter (ie., the frame is maximally late).
 268         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 269
 270         // How many times are the master card expected to tick in that time?
 271         // We assume the master clock has worst-case jitter but not any rate
 272         // discrepancy, ie., it ticks as early as possible every time, but not
 273         // cumulatively.
 274         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 275
 276         // As a special case, if the master card ticks faster than the input card,
 277         // we expect the queue to drain by itself even without dropping. But if
 278         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 279         // go slowly enough that the effect wouldn't really be appreciable.
 280         // We account for this by looking at the situation five frames ahead,
 281         // assuming everything else is the same.
 282         double frames_allowed;
 283         if (master_frame_duration < input_frame_duration) {
 284                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 285         } else {
 286                 frames_allowed = frames_needed;
 287         }
 288
 289         safe_queue_length = max<int>(floor(frames_allowed), 0);
 290         metric_input_queue_safe_length_frames = safe_queue_length;
 291 }
 292
 293 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 294         : httpd(),
 295           num_cards(num_cards),
 296           mixer_surface(create_surface(format)),
 297           h264_encoder_surface(create_surface(format)),
 298           decklink_output_surface(create_surface(format)),
 299           audio_mixer(num_cards)
 300 {
 301         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 302         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 303         check_error();
 304
 305         // This nearly always should be true.
 306         global_flags.can_disable_srgb_decoder =
 307                 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
 308                 epoxy_has_gl_extension("GL_ARB_sampler_objects");
 309
 310         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 311         // will be halved when sampling them, and we need to compensate here.
 312         movit_texel_subpixel_precision /= 2.0;
 313
 314         resource_pool.reset(new ResourcePool);
 315         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 316                 output_channel[i].parent = this;
 317                 output_channel[i].channel = i;
 318         }
 319
 320         ImageFormat inout_format;
 321         inout_format.color_space = COLORSPACE_sRGB;
 322         inout_format.gamma_curve = GAMMA_sRGB;
 323
 324         // Matches the 4:2:0 format created by the main chain.
 325         YCbCrFormat ycbcr_format;
 326         ycbcr_format.chroma_subsampling_x = 2;
 327         ycbcr_format.chroma_subsampling_y = 2;
 328         if (global_flags.ycbcr_rec709_coefficients) {
 329                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 330         } else {
 331                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 332         }
 333         ycbcr_format.full_range = false;
 334         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 335         ycbcr_format.cb_x_position = 0.0f;
 336         ycbcr_format.cr_x_position = 0.0f;
 337         ycbcr_format.cb_y_position = 0.5f;
 338         ycbcr_format.cr_y_position = 0.5f;
 339
 340         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 341         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 342         check_error();
 343         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 344         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 345         display_chain->add_input(display_input);
 346         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 347         display_chain->set_dither_bits(0);  // Don't bother.
 348         display_chain->finalize();
 349
 350         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));
 351
 352         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 353         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 354
 355         // Start listening for clients only once VideoEncoder has written its header, if any.
 356         httpd.start(global_flags.http_port);
 357
 358         // First try initializing the then PCI devices, then USB, then
 359         // fill up with fake cards until we have the desired number of cards.
 360         unsigned num_pci_devices = 0;
 361         unsigned card_index = 0;
 362
 363         {
 364                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 365                 if (decklink_iterator != nullptr) {
 366                         for ( ; card_index < num_cards; ++card_index) {
 367                                 IDeckLink *decklink;
 368                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 369                                         break;
 370                                 }
 371
 372                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 373                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 374                                 if (!output->set_device(decklink)) {
 375                                         delete output;
 376                                         output = nullptr;
 377                                 }
 378                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 379                                 ++num_pci_devices;
 380                         }
 381                         decklink_iterator->Release();
 382                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 383                 } else {
 384                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 385                 }
 386         }
 387
 388         unsigned num_usb_devices = BMUSBCapture::num_cards();
 389         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 390                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 391                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 392                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 393         }
 394         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 395
 396         unsigned num_fake_cards = 0;
 397         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 398                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 399                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 400         }
 401
 402         if (num_fake_cards > 0) {
 403                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 404         }
 405
 406         // Initialize all video inputs the theme asked for. Note that these are
 407         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 408         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 409         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 410                 if (card_index >= MAX_VIDEO_CARDS) {
 411                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 412                         exit(1);
 413                 }
 414                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 415                 video_inputs[video_card_index]->set_card_index(card_index);
 416         }
 417         num_video_inputs = video_inputs.size();
 418
 419         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 420         BMUSBCapture::start_bm_thread();
 421
 422         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 423                 cards[card_index].queue_length_policy.reset(card_index);
 424         }
 425
 426         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 427
 428         if (global_flags.ten_bit_input) {
 429                 if (!v210Converter::has_hardware_support()) {
 430                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 431                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 432                         exit(1);
 433                 }
 434                 v210_converter.reset(new v210Converter());
 435
 436                 // These are all the widths listed in the Blackmagic SDK documentation
 437                 // (section 2.7.3, “Display Modes”).
 438                 v210_converter->precompile_shader(720);
 439                 v210_converter->precompile_shader(1280);
 440                 v210_converter->precompile_shader(1920);
 441                 v210_converter->precompile_shader(2048);
 442                 v210_converter->precompile_shader(3840);
 443                 v210_converter->precompile_shader(4096);
 444         }
 445         if (global_flags.ten_bit_output) {
 446                 if (!v210Converter::has_hardware_support()) {
 447                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 448                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 449                         exit(1);
 450                 }
 451         }
 452
 453         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 454         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 455         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 456
 457         if (global_flags.enable_alsa_output) {
 458                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 459         }
 460         if (global_flags.output_card != -1) {
 461                 desired_output_card_index = global_flags.output_card;
 462                 set_output_card_internal(global_flags.output_card);
 463         }
 464
 465         output_jitter_history.register_metrics({{ "card", "output" }});
 466 }
 467
 468 Mixer::~Mixer()
 469 {
 470         BMUSBCapture::stop_bm_thread();
 471
 472         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 473                 {
 474                         unique_lock<mutex> lock(card_mutex);
 475                         cards[card_index].should_quit = true;  // Unblock thread.
 476                         cards[card_index].new_frames_changed.notify_all();
 477                 }
 478                 cards[card_index].capture->stop_dequeue_thread();
 479                 if (cards[card_index].output) {
 480                         cards[card_index].output->end_output();
 481                         cards[card_index].output.reset();
 482                 }
 483         }
 484
 485         video_encoder.reset(nullptr);
 486 }
 487
 488 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 489 {
 490         printf("Configuring card %d...\n", card_index);
 491
 492         CaptureCard *card = &cards[card_index];
 493         if (card->capture != nullptr) {
 494                 card->capture->stop_dequeue_thread();
 495         }
 496         card->capture.reset(capture);
 497         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 498         card->type = card_type;
 499         if (card->output.get() != output) {
 500                 card->output.reset(output);
 501         }
 502
 503         PixelFormat pixel_format;
 504         if (card_type == CardType::FFMPEG_INPUT) {
 505                 pixel_format = capture->get_current_pixel_format();
 506         } else if (global_flags.ten_bit_input) {
 507                 pixel_format = PixelFormat_10BitYCbCr;
 508         } else {
 509                 pixel_format = PixelFormat_8BitYCbCr;
 510         }
 511
 512         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 513         if (card->frame_allocator == nullptr) {
 514                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 515         }
 516         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 517         if (card->surface == nullptr) {
 518                 card->surface = create_surface_with_same_format(mixer_surface);
 519         }
 520         while (!card->new_frames.empty()) card->new_frames.pop_front();
 521         card->last_timecode = -1;
 522         card->capture->set_pixel_format(pixel_format);
 523         card->capture->configure_card();
 524
 525         // NOTE: start_bm_capture() happens in thread_func().
 526
 527         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 528         audio_mixer.reset_resampler(device);
 529         audio_mixer.set_display_name(device, card->capture->get_description());
 530         audio_mixer.trigger_state_changed_callback();
 531
 532         // Unregister old metrics, if any.
 533         if (!card->labels.empty()) {
 534                 const vector<pair<string, string>> &labels = card->labels;
 535                 card->jitter_history.unregister_metrics(labels);
 536                 card->queue_length_policy.unregister_metrics(labels);
 537                 global_metrics.remove("input_received_frames", labels);
 538                 global_metrics.remove("input_dropped_frames_jitter", labels);
 539                 global_metrics.remove("input_dropped_frames_error", labels);
 540                 global_metrics.remove("input_dropped_frames_resets", labels);
 541                 global_metrics.remove("input_queue_length_frames", labels);
 542                 global_metrics.remove("input_queue_duped_frames", labels);
 543
 544                 global_metrics.remove("input_has_signal_bool", labels);
 545                 global_metrics.remove("input_is_connected_bool", labels);
 546                 global_metrics.remove("input_interlaced_bool", labels);
 547                 global_metrics.remove("input_width_pixels", labels);
 548                 global_metrics.remove("input_height_pixels", labels);
 549                 global_metrics.remove("input_frame_rate_nom", labels);
 550                 global_metrics.remove("input_frame_rate_den", labels);
 551                 global_metrics.remove("input_sample_rate_hz", labels);
 552         }
 553
 554         // Register metrics.
 555         vector<pair<string, string>> labels;
 556         char card_name[64];
 557         snprintf(card_name, sizeof(card_name), "%d", card_index);
 558         labels.emplace_back("card", card_name);
 559
 560         switch (card_type) {
 561         case CardType::LIVE_CARD:
 562                 labels.emplace_back("cardtype", "live");
 563                 break;
 564         case CardType::FAKE_CAPTURE:
 565                 labels.emplace_back("cardtype", "fake");
 566                 break;
 567         case CardType::FFMPEG_INPUT:
 568                 labels.emplace_back("cardtype", "ffmpeg");
 569                 break;
 570         default:
 571                 assert(false);
 572         }
 573         card->jitter_history.register_metrics(labels);
 574         card->queue_length_policy.register_metrics(labels);
 575         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 576         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 577         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 578         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 579         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 580         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 581
 582         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 583         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 584         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 585         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 586         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 587         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 588         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 589         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 590         card->labels = labels;
 591 }
 592
 593 void Mixer::set_output_card_internal(int card_index)
 594 {
 595         // We don't really need to take card_mutex, since we're in the mixer
 596         // thread and don't mess with any queues (which is the only thing that happens
 597         // from other threads), but it's probably the safest in the long run.
 598         unique_lock<mutex> lock(card_mutex);
 599         if (output_card_index != -1) {
 600                 // Switch the old card from output to input.
 601                 CaptureCard *old_card = &cards[output_card_index];
 602                 old_card->output->end_output();
 603
 604                 // Stop the fake card that we put into place.
 605                 // This needs to _not_ happen under the mutex, to avoid deadlock
 606                 // (delivering the last frame needs to take the mutex).
 607                 CaptureInterface *fake_capture = old_card->capture.get();
 608                 lock.unlock();
 609                 fake_capture->stop_dequeue_thread();
 610                 lock.lock();
 611                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 612                 old_card->is_fake_capture = false;
 613                 old_card->capture->start_bm_capture();
 614         }
 615         if (card_index != -1) {
 616                 CaptureCard *card = &cards[card_index];
 617                 CaptureInterface *capture = card->capture.get();
 618                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 619                 // several seconds to complete (blocking on DisableVideoInput);
 620                 // see if we can maybe do it asynchronously.
 621                 lock.unlock();
 622                 capture->stop_dequeue_thread();
 623                 lock.lock();
 624                 card->parked_capture = move(card->capture);
 625                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 626                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 627                 card->queue_length_policy.reset(card_index);
 628                 card->capture->start_bm_capture();
 629                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 630                 card->output->start_output(desired_output_video_mode, pts_int);
 631         }
 632         output_card_index = card_index;
 633         output_jitter_history.clear();
 634 }
 635
 636 namespace {
 637
 638 int unwrap_timecode(uint16_t current_wrapped, int last)
 639 {
 640         uint16_t last_wrapped = last & 0xffff;
 641         if (current_wrapped > last_wrapped) {
 642                 return (last & ~0xffff) | current_wrapped;
 643         } else {
 644                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 645         }
 646 }
 647
 648 }  // namespace
 649
 650 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 651                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 652                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 653 {
 654         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 655         CaptureCard *card = &cards[card_index];
 656
 657         ++card->metric_input_received_frames;
 658         card->metric_input_has_signal_bool = video_format.has_signal;
 659         card->metric_input_is_connected_bool = video_format.is_connected;
 660         card->metric_input_interlaced_bool = video_format.interlaced;
 661         card->metric_input_width_pixels = video_format.width;
 662         card->metric_input_height_pixels = video_format.height;
 663         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 664         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 665         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 666
 667         if (is_mode_scanning[card_index]) {
 668                 if (video_format.has_signal) {
 669                         // Found a stable signal, so stop scanning.
 670                         is_mode_scanning[card_index] = false;
 671                 } else {
 672                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 673                         steady_clock::time_point now = steady_clock::now();
 674                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 675                         if (sec_since_last_switch > switch_time_s) {
 676                                 // It isn't this mode; try the next one.
 677                                 mode_scanlist_index[card_index]++;
 678                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 679                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 680                                 last_mode_scan_change[card_index] = now;
 681                         }
 682                 }
 683         }
 684
 685         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 686         assert(frame_length > 0);
 687
 688         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;
 689         if (num_samples > OUTPUT_FREQUENCY / 10) {
 690                 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",
 691                         card_index, int(audio_frame.len), int(audio_offset),
 692                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 693                 if (video_frame.owner) {
 694                         video_frame.owner->release_frame(video_frame);
 695                 }
 696                 if (audio_frame.owner) {
 697                         audio_frame.owner->release_frame(audio_frame);
 698                 }
 699                 return;
 700         }
 701
 702         int dropped_frames = 0;
 703         if (card->last_timecode != -1) {
 704                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 705         }
 706
 707         // Number of samples per frame if we need to insert silence.
 708         // (Could be nonintegral, but resampling will save us then.)
 709         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 710
 711         if (dropped_frames > MAX_FPS * 2) {
 712                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 713                         card_index, card->last_timecode, timecode);
 714                 audio_mixer.reset_resampler(device);
 715                 dropped_frames = 0;
 716                 ++card->metric_input_resets;
 717         } else if (dropped_frames > 0) {
 718                 // Insert silence as needed.
 719                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 720                         card_index, dropped_frames, timecode);
 721                 card->metric_input_dropped_frames_error += dropped_frames;
 722
 723                 bool success;
 724                 do {
 725                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 726                 } while (!success);
 727         }
 728
 729         if (num_samples > 0) {
 730                 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 731         }
 732
 733         // Done with the audio, so release it.
 734         if (audio_frame.owner) {
 735                 audio_frame.owner->release_frame(audio_frame);
 736         }
 737
 738         card->last_timecode = timecode;
 739
 740         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 741
 742         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 743         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 744         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 745                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 746                 assert(card->type == CardType::FFMPEG_INPUT);
 747                 assert(video_offset == 0);
 748                 expected_length = video_frame.len;
 749
 750                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 751                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 752                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 753                 cbcr_offset = video_format.width * video_format.height;
 754                 y_offset = 0;
 755         } else {
 756                 // All the other Y'CbCr formats are 4:2:2.
 757                 cbcr_width = video_format.width / 2;
 758                 cbcr_height = video_format.height;
 759                 cbcr_offset = video_offset / 2;
 760                 y_offset = video_frame.size / 2 + video_offset / 2;
 761         }
 762         if (video_frame.len - video_offset == 0 ||
 763             video_frame.len - video_offset != expected_length) {
 764                 if (video_frame.len != 0) {
 765                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 766                                 card_index, video_frame.len - video_offset, expected_length);
 767                 }
 768                 if (video_frame.owner) {
 769                         video_frame.owner->release_frame(video_frame);
 770                 }
 771
 772                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 773                 // so that pts can go up accordingly.
 774                 {
 775                         unique_lock<mutex> lock(card_mutex);
 776                         CaptureCard::NewFrame new_frame;
 777                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 778                         new_frame.length = frame_length;
 779                         new_frame.interlaced = false;
 780                         new_frame.dropped_frames = dropped_frames;
 781                         new_frame.received_timestamp = video_frame.received_timestamp;
 782                         card->new_frames.push_back(move(new_frame));
 783                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 784                 }
 785                 card->new_frames_changed.notify_all();
 786                 return;
 787         }
 788
 789         unsigned num_fields = video_format.interlaced ? 2 : 1;
 790         steady_clock::time_point frame_upload_start;
 791         bool interlaced_stride = false;
 792         if (video_format.interlaced) {
 793                 // Send the two fields along as separate frames; the other side will need to add
 794                 // a deinterlacer to actually get this right.
 795                 assert(video_format.height % 2 == 0);
 796                 video_format.height /= 2;
 797                 cbcr_height /= 2;
 798                 assert(frame_length % 2 == 0);
 799                 frame_length /= 2;
 800                 num_fields = 2;
 801                 if (video_format.second_field_start == 1) {
 802                         interlaced_stride = true;
 803                 }
 804                 frame_upload_start = steady_clock::now();
 805         }
 806         userdata->last_interlaced = video_format.interlaced;
 807         userdata->last_has_signal = video_format.has_signal;
 808         userdata->last_is_connected = video_format.is_connected;
 809         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 810         userdata->last_frame_rate_den = video_format.frame_rate_den;
 811         RefCountedFrame frame(video_frame);
 812
 813         // Upload the textures.
 814         for (unsigned field = 0; field < num_fields; ++field) {
 815                 // Put the actual texture upload in a lambda that is executed in the main thread.
 816                 // It is entirely possible to do this in the same thread (and it might even be
 817                 // faster, depending on the GPU and driver), but it appears to be trickling
 818                 // driver bugs very easily.
 819                 //
 820                 // Note that this means we must hold on to the actual frame data in <userdata>
 821                 // until the upload command is run, but we hold on to <frame> much longer than that
 822                 // (in fact, all the way until we no longer use the texture in rendering).
 823                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 824                         unsigned field_start_line;
 825                         if (field == 1) {
 826                                 field_start_line = video_format.second_field_start;
 827                         } else {
 828                                 field_start_line = video_format.extra_lines_top;
 829                         }
 830
 831                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 832                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 833                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 834
 835                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 836                         check_error();
 837
 838                         switch (userdata->pixel_format) {
 839                         case PixelFormat_10BitYCbCr: {
 840                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 841                                 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);
 842                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 843                                 break;
 844                         }
 845                         case PixelFormat_8BitYCbCr: {
 846                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 847                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 848
 849                                 // Make up our own strides, since we are interleaving.
 850                                 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);
 851                                 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);
 852                                 break;
 853                         }
 854                         case PixelFormat_8BitYCbCrPlanar: {
 855                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 856                                 size_t field_y_start = y_offset;
 857                                 size_t field_cb_start = cbcr_offset;
 858                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 859
 860                                 // Make up our own strides, since we are interleaving.
 861                                 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);
 862                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 863                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 864                                 break;
 865                         }
 866                         case PixelFormat_8BitBGRA: {
 867                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 868                                 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);
 869                                 // These could be asked to deliver mipmaps at any time.
 870                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 871                                 check_error();
 872                                 glGenerateMipmap(GL_TEXTURE_2D);
 873                                 check_error();
 874                                 glBindTexture(GL_TEXTURE_2D, 0);
 875                                 check_error();
 876                                 break;
 877                         }
 878                         default:
 879                                 assert(false);
 880                         }
 881
 882                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 883                         check_error();
 884                 };
 885
 886                 if (field == 1) {
 887                         // Don't upload the second field as fast as we can; wait until
 888                         // the field time has approximately passed. (Otherwise, we could
 889                         // get timing jitter against the other sources, and possibly also
 890                         // against the video display, although the latter is not as critical.)
 891                         // This requires our system clock to be reasonably close to the
 892                         // video clock, but that's not an unreasonable assumption.
 893                         steady_clock::time_point second_field_start = frame_upload_start +
 894                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 895                         this_thread::sleep_until(second_field_start);
 896                 }
 897
 898                 {
 899                         unique_lock<mutex> lock(card_mutex);
 900                         CaptureCard::NewFrame new_frame;
 901                         new_frame.frame = frame;
 902                         new_frame.length = frame_length;
 903                         new_frame.field = field;
 904                         new_frame.interlaced = video_format.interlaced;
 905                         new_frame.upload_func = upload_func;
 906                         new_frame.dropped_frames = dropped_frames;
 907                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 908                         card->new_frames.push_back(move(new_frame));
 909                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 910                 }
 911                 card->new_frames_changed.notify_all();
 912         }
 913 }
 914
 915 void Mixer::bm_hotplug_add(libusb_device *dev)
 916 {
 917         lock_guard<mutex> lock(hotplug_mutex);
 918         hotplugged_cards.push_back(dev);
 919 }
 920
 921 void Mixer::bm_hotplug_remove(unsigned card_index)
 922 {
 923         cards[card_index].new_frames_changed.notify_all();
 924 }
 925
 926 void Mixer::thread_func()
 927 {
 928         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 929
 930         eglBindAPI(EGL_OPENGL_API);
 931         QOpenGLContext *context = create_context(mixer_surface);
 932         if (!make_current(context, mixer_surface)) {
 933                 printf("oops\n");
 934                 exit(1);
 935         }
 936
 937         // Start the actual capture. (We don't want to do it before we're actually ready
 938         // to process output frames.)
 939         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 940                 if (int(card_index) != output_card_index) {
 941                         cards[card_index].capture->start_bm_capture();
 942                 }
 943         }
 944
 945         BasicStats basic_stats(/*verbose=*/true);
 946         int stats_dropped_frames = 0;
 947
 948         while (!should_quit) {
 949                 if (desired_output_card_index != output_card_index) {
 950                         set_output_card_internal(desired_output_card_index);
 951                 }
 952                 if (output_card_index != -1 &&
 953                     desired_output_video_mode != output_video_mode) {
 954                         DeckLinkOutput *output = cards[output_card_index].output.get();
 955                         output->end_output();
 956                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 957                         output->start_output(desired_output_video_mode, pts_int);
 958                 }
 959
 960                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 961                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 962
 963                 bool master_card_is_output;
 964                 unsigned master_card_index;
 965                 if (output_card_index != -1) {
 966                         master_card_is_output = true;
 967                         master_card_index = output_card_index;
 968                 } else {
 969                         master_card_is_output = false;
 970                         master_card_index = theme->map_signal(master_clock_channel);
 971                         assert(master_card_index < num_cards);
 972                 }
 973
 974                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
 975                 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);
 976                 stats_dropped_frames += output_frame_info.dropped_frames;
 977
 978                 handle_hotplugged_cards();
 979
 980                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
 981                         if (card_index == master_card_index || !has_new_frame[card_index]) {
 982                                 continue;
 983                         }
 984                         if (new_frames[card_index].frame->len == 0) {
 985                                 ++new_frames[card_index].dropped_frames;
 986                         }
 987                         if (new_frames[card_index].dropped_frames > 0) {
 988                                 printf("Card %u dropped %d frames before this\n",
 989                                         card_index, int(new_frames[card_index].dropped_frames));
 990                         }
 991                 }
 992
 993                 // If the first card is reporting a corrupted or otherwise dropped frame,
 994                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 995                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
 996                         ++stats_dropped_frames;
 997                         pts_int += new_frames[master_card_index].length;
 998                         continue;
 999                 }
1000
1001                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1002                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1003                                 continue;
1004
1005                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1006                         assert(new_frame->frame != nullptr);
1007                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1008                         check_error();
1009
1010                         // The new texture might need uploading before use.
1011                         if (new_frame->upload_func) {
1012                                 new_frame->upload_func();
1013                                 new_frame->upload_func = nullptr;
1014                         }
1015                 }
1016
1017                 int64_t frame_duration = output_frame_info.frame_duration;
1018                 render_one_frame(frame_duration);
1019                 ++frame_num;
1020                 pts_int += frame_duration;
1021
1022                 basic_stats.update(frame_num, stats_dropped_frames);
1023                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1024
1025                 if (should_cut.exchange(false)) {  // Test and clear.
1026                         video_encoder->do_cut(frame_num);
1027                 }
1028
1029 #if 0
1030                 // Reset every 100 frames, so that local variations in frame times
1031                 // (especially for the first few frames, when the shaders are
1032                 // compiled etc.) don't make it hard to measure for the entire
1033                 // remaining duration of the program.
1034                 if (frame == 10000) {
1035                         frame = 0;
1036                         start = now;
1037                 }
1038 #endif
1039                 check_error();
1040         }
1041
1042         resource_pool->clean_context();
1043 }
1044
1045 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1046 {
1047         if (output_card_index != -1) {
1048                 // The output card (ie., cards[output_card_index].output) is the master clock,
1049                 // so no input card (ie., cards[card_index].capture) is.
1050                 return false;
1051         }
1052         return (card_index == master_card_index);
1053 }
1054
1055 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1056 {
1057         // Count the number of frames in the queue, including any frames
1058         // we dropped. It's hard to know exactly how we should deal with
1059         // dropped (corrupted) input frames; they don't help our goal of
1060         // avoiding starvation, but they still add to the problem of latency.
1061         // Since dropped frames is going to mean a bump in the signal anyway,
1062         // we err on the side of having more stable latency instead.
1063         unsigned queue_length = 0;
1064         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1065                 queue_length += frame.dropped_frames + 1;
1066         }
1067
1068         // If needed, drop frames until the queue is below the safe limit.
1069         // We prefer to drop from the head, because all else being equal,
1070         // we'd like more recent frames (less latency).
1071         unsigned dropped_frames = 0;
1072         while (queue_length > safe_queue_length) {
1073                 assert(!card->new_frames.empty());
1074                 assert(queue_length > card->new_frames.front().dropped_frames);
1075                 queue_length -= card->new_frames.front().dropped_frames;
1076
1077                 if (queue_length <= safe_queue_length) {
1078                         // No need to drop anything.
1079                         break;
1080                 }
1081
1082                 card->new_frames.pop_front();
1083                 card->new_frames_changed.notify_all();
1084                 --queue_length;
1085                 ++dropped_frames;
1086         }
1087
1088         card->metric_input_dropped_frames_jitter += dropped_frames;
1089         card->metric_input_queue_length_frames = queue_length;
1090
1091 #if 0
1092         if (dropped_frames > 0) {
1093                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1094                         card_index, dropped_frames);
1095         }
1096 #endif
1097 }
1098
1099
1100 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])
1101 {
1102         OutputFrameInfo output_frame_info;
1103 start:
1104         unique_lock<mutex> lock(card_mutex, defer_lock);
1105         if (master_card_is_output) {
1106                 // Clocked to the output, so wait for it to be ready for the next frame.
1107                 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);
1108                 lock.lock();
1109         } else {
1110                 // Wait for the master card to have a new frame.
1111                 // TODO: Add a timeout.
1112                 output_frame_info.is_preroll = false;
1113                 lock.lock();
1114                 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(); });
1115         }
1116
1117         if (master_card_is_output) {
1118                 handle_hotplugged_cards();
1119         } else if (cards[master_card_index].new_frames.empty()) {
1120                 // We were woken up, but not due to a new frame. Deal with it
1121                 // and then restart.
1122                 assert(cards[master_card_index].capture->get_disconnected());
1123                 handle_hotplugged_cards();
1124                 lock.unlock();
1125                 goto start;
1126         }
1127
1128         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1129                 CaptureCard *card = &cards[card_index];
1130                 if (card->new_frames.empty()) {  // Starvation.
1131                         ++card->metric_input_duped_frames;
1132                 } else {
1133                         new_frames[card_index] = move(card->new_frames.front());
1134                         has_new_frame[card_index] = true;
1135                         card->new_frames.pop_front();
1136                         card->new_frames_changed.notify_all();
1137                 }
1138         }
1139
1140         if (!master_card_is_output) {
1141                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1142                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1143                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1144         }
1145
1146         if (!output_frame_info.is_preroll) {
1147                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1148         }
1149
1150         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1151                 CaptureCard *card = &cards[card_index];
1152                 if (has_new_frame[card_index] &&
1153                     !input_card_is_master_clock(card_index, master_card_index) &&
1154                     !output_frame_info.is_preroll) {
1155                         card->queue_length_policy.update_policy(
1156                                 output_frame_info.frame_timestamp,
1157                                 card->jitter_history.get_expected_next_frame(),
1158                                 new_frames[master_card_index].length,
1159                                 output_frame_info.frame_duration,
1160                                 card->jitter_history.estimate_max_jitter(),
1161                                 output_jitter_history.estimate_max_jitter());
1162                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1163                                                   card->queue_length_policy.get_safe_queue_length()));
1164                 }
1165         }
1166
1167         // This might get off by a fractional sample when changing master card
1168         // between ones with different frame rates, but that's fine.
1169         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1170         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1171         fractional_samples = num_samples_times_timebase % TIMEBASE;
1172         assert(output_frame_info.num_samples >= 0);
1173
1174         return output_frame_info;
1175 }
1176
1177 void Mixer::handle_hotplugged_cards()
1178 {
1179         // Check for cards that have been disconnected since last frame.
1180         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1181                 CaptureCard *card = &cards[card_index];
1182                 if (card->capture->get_disconnected()) {
1183                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1184                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1185                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1186                         card->queue_length_policy.reset(card_index);
1187                         card->capture->start_bm_capture();
1188                 }
1189         }
1190
1191         // Check for cards that have been connected since last frame.
1192         vector<libusb_device *> hotplugged_cards_copy;
1193         {
1194                 lock_guard<mutex> lock(hotplug_mutex);
1195                 swap(hotplugged_cards, hotplugged_cards_copy);
1196         }
1197         for (libusb_device *new_dev : hotplugged_cards_copy) {
1198                 // Look for a fake capture card where we can stick this in.
1199                 int free_card_index = -1;
1200                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1201                         if (cards[card_index].is_fake_capture) {
1202                                 free_card_index = card_index;
1203                                 break;
1204                         }
1205                 }
1206
1207                 if (free_card_index == -1) {
1208                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1209                         libusb_unref_device(new_dev);
1210                 } else {
1211                         // BMUSBCapture takes ownership.
1212                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1213                         CaptureCard *card = &cards[free_card_index];
1214                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1215                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1216                         card->queue_length_policy.reset(free_card_index);
1217                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1218                         capture->start_bm_capture();
1219                 }
1220         }
1221 }
1222
1223
1224 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)
1225 {
1226         // Resample the audio as needed, including from previously dropped frames.
1227         assert(num_cards > 0);
1228         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1229                 const bool dropped_frame = (frame_num != dropped_frames);
1230                 {
1231                         // Signal to the audio thread to process this frame.
1232                         // Note that if the frame is a dropped frame, we signal that
1233                         // we don't want to use this frame as base for adjusting
1234                         // the resampler rate. The reason for this is that the timing
1235                         // of these frames is often way too late; they typically don't
1236                         // “arrive” before we synthesize them. Thus, we could end up
1237                         // in a situation where we have inserted e.g. five audio frames
1238                         // into the queue before we then start pulling five of them
1239                         // back out. This makes ResamplingQueue overestimate the delay,
1240                         // causing undue resampler changes. (We _do_ use the last,
1241                         // non-dropped frame; perhaps we should just discard that as well,
1242                         // since dropped frames are expected to be rare, and it might be
1243                         // better to just wait until we have a slightly more normal situation).
1244                         unique_lock<mutex> lock(audio_mutex);
1245                         bool adjust_rate = !dropped_frame && !is_preroll;
1246                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1247                         audio_task_queue_changed.notify_one();
1248                 }
1249                 if (dropped_frame) {
1250                         // For dropped frames, increase the pts. Note that if the format changed
1251                         // in the meantime, we have no way of detecting that; we just have to
1252                         // assume the frame length is always the same.
1253                         pts_int += length_per_frame;
1254                 }
1255         }
1256 }
1257
1258 void Mixer::render_one_frame(int64_t duration)
1259 {
1260         // Determine the time code for this frame before we start rendering.
1261         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1262         if (display_timecode_on_stdout) {
1263                 printf("Timecode: '%s'\n", timecode_text.c_str());
1264         }
1265
1266         // Update Y'CbCr settings for all cards.
1267         {
1268                 unique_lock<mutex> lock(card_mutex);
1269                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1270                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1271                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1272                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1273                         input_state.full_range[card_index] = interpretation->full_range;
1274                 }
1275         }
1276
1277         // Get the main chain from the theme, and set its state immediately.
1278         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1279         EffectChain *chain = theme_main_chain.chain;
1280         theme_main_chain.setup_chain();
1281         //theme_main_chain.chain->enable_phase_timing(true);
1282
1283         // The theme can't (or at least shouldn't!) call connect_signal() on
1284         // each FFmpeg input, so we'll do it here.
1285         for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1286                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1287         }
1288
1289         // If HDMI/SDI output is active and the user has requested auto mode,
1290         // its mode overrides the existing Y'CbCr setting for the chain.
1291         YCbCrLumaCoefficients ycbcr_output_coefficients;
1292         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1293                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1294         } else {
1295                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1296         }
1297
1298         // TODO: Reduce the duplication against theme.cpp.
1299         YCbCrFormat output_ycbcr_format;
1300         output_ycbcr_format.chroma_subsampling_x = 1;
1301         output_ycbcr_format.chroma_subsampling_y = 1;
1302         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1303         output_ycbcr_format.full_range = false;
1304         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1305         chain->change_ycbcr_output_format(output_ycbcr_format);
1306
1307         // Render main chain. If we're using zerocopy Quick Sync encoding
1308         // (the default case), we take an extra copy of the created outputs,
1309         // so that we can display it back to the screen later (it's less memory
1310         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1311         // Ideally, we'd like to avoid taking copies and just use the main textures
1312         // for display as well, but they're just views into VA-API memory and must be
1313         // unmapped during encoding, so we can't use them for display, unfortunately.
1314         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1315         GLuint y_copy_tex, cbcr_copy_tex = 0;
1316         GLuint y_display_tex, cbcr_display_tex;
1317         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1318         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1319         const bool is_zerocopy = video_encoder->is_zerocopy();
1320         if (is_zerocopy) {
1321                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1322                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1323                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1324
1325                 y_display_tex = y_copy_tex;
1326                 cbcr_display_tex = cbcr_copy_tex;
1327
1328                 // y_tex and cbcr_tex will be given by VideoEncoder.
1329         } else {
1330                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1331                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1332                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1333
1334                 y_display_tex = y_tex;
1335                 cbcr_display_tex = cbcr_tex;
1336         }
1337
1338         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1339         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1340         assert(got_frame);
1341
1342         GLuint fbo;
1343         if (is_zerocopy) {
1344                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1345         } else {
1346                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1347         }
1348         check_error();
1349         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1350
1351         if (display_timecode_in_stream) {
1352                 // Render the timecode on top.
1353                 timecode_renderer->render_timecode(fbo, timecode_text);
1354         }
1355
1356         resource_pool->release_fbo(fbo);
1357
1358         if (is_zerocopy) {
1359                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1360         } else {
1361                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1362         }
1363         if (output_card_index != -1) {
1364                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1365         }
1366         resource_pool->release_2d_texture(cbcr_full_tex);
1367
1368         // Set the right state for the Y' and CbCr textures we use for display.
1369         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1370         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1371         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1372         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1373         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1374
1375         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1376         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1377         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1378         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1379
1380         RefCountedGLsync fence = video_encoder->end_frame();
1381
1382         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1383         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1384         DisplayFrame live_frame;
1385         live_frame.chain = display_chain.get();
1386         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1387                 display_input->set_texture_num(0, y_display_tex);
1388                 display_input->set_texture_num(1, cbcr_display_tex);
1389         };
1390         live_frame.ready_fence = fence;
1391         live_frame.input_frames = {};
1392         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1393         output_channel[OUTPUT_LIVE].output_frame(live_frame);
1394
1395         // Set up preview and any additional channels.
1396         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1397                 DisplayFrame display_frame;
1398                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1399                 display_frame.chain = chain.chain;
1400                 display_frame.setup_chain = chain.setup_chain;
1401                 display_frame.ready_fence = fence;
1402                 display_frame.input_frames = chain.input_frames;
1403                 display_frame.temp_textures = {};
1404                 output_channel[i].output_frame(display_frame);
1405         }
1406 }
1407
1408 void Mixer::audio_thread_func()
1409 {
1410         pthread_setname_np(pthread_self(), "Mixer_Audio");
1411
1412         while (!should_quit) {
1413                 AudioTask task;
1414
1415                 {
1416                         unique_lock<mutex> lock(audio_mutex);
1417                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1418                         if (should_quit) {
1419                                 return;
1420                         }
1421                         task = audio_task_queue.front();
1422                         audio_task_queue.pop();
1423                 }
1424
1425                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1426                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1427                 vector<float> samples_out = audio_mixer.get_output(
1428                         task.frame_timestamp,
1429                         task.num_samples,
1430                         rate_adjustment_policy);
1431
1432                 // Send the samples to the sound card, then add them to the output.
1433                 if (alsa) {
1434                         alsa->write(samples_out);
1435                 }
1436                 if (output_card_index != -1) {
1437                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1438                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1439                 }
1440                 video_encoder->add_audio(task.pts_int, move(samples_out));
1441         }
1442 }
1443
1444 void Mixer::release_display_frame(DisplayFrame *frame)
1445 {
1446         for (GLuint texnum : frame->temp_textures) {
1447                 resource_pool->release_2d_texture(texnum);
1448         }
1449         frame->temp_textures.clear();
1450         frame->ready_fence.reset();
1451         frame->input_frames.clear();
1452 }
1453
1454 void Mixer::start()
1455 {
1456         mixer_thread = thread(&Mixer::thread_func, this);
1457         audio_thread = thread(&Mixer::audio_thread_func, this);
1458 }
1459
1460 void Mixer::quit()
1461 {
1462         should_quit = true;
1463         audio_task_queue_changed.notify_one();
1464         mixer_thread.join();
1465         audio_thread.join();
1466 }
1467
1468 void Mixer::transition_clicked(int transition_num)
1469 {
1470         theme->transition_clicked(transition_num, pts());
1471 }
1472
1473 void Mixer::channel_clicked(int preview_num)
1474 {
1475         theme->channel_clicked(preview_num);
1476 }
1477
1478 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1479 {
1480         unique_lock<mutex> lock(card_mutex);
1481         return ycbcr_interpretation[card_index];
1482 }
1483
1484 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1485 {
1486         unique_lock<mutex> lock(card_mutex);
1487         ycbcr_interpretation[card_index] = interpretation;
1488 }
1489
1490 void Mixer::start_mode_scanning(unsigned card_index)
1491 {
1492         assert(card_index < num_cards);
1493         if (is_mode_scanning[card_index]) {
1494                 return;
1495         }
1496         is_mode_scanning[card_index] = true;
1497         mode_scanlist[card_index].clear();
1498         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1499                 mode_scanlist[card_index].push_back(mode.first);
1500         }
1501         assert(!mode_scanlist[card_index].empty());
1502         mode_scanlist_index[card_index] = 0;
1503         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1504         last_mode_scan_change[card_index] = steady_clock::now();
1505 }
1506
1507 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1508 {
1509         assert(desired_output_card_index != -1);
1510         unique_lock<mutex> lock(card_mutex);
1511         return cards[desired_output_card_index].output->get_available_video_modes();
1512 }
1513
1514 Mixer::OutputChannel::~OutputChannel()
1515 {
1516         if (has_current_frame) {
1517                 parent->release_display_frame(&current_frame);
1518         }
1519         if (has_ready_frame) {
1520                 parent->release_display_frame(&ready_frame);
1521         }
1522 }
1523
1524 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1525 {
1526         // Store this frame for display. Remove the ready frame if any
1527         // (it was seemingly never used).
1528         {
1529                 unique_lock<mutex> lock(frame_mutex);
1530                 if (has_ready_frame) {
1531                         parent->release_display_frame(&ready_frame);
1532                 }
1533                 ready_frame = frame;
1534                 has_ready_frame = true;
1535
1536                 // Call the callbacks under the mutex (they should be short),
1537                 // so that we don't race against a callback removal.
1538                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1539                         key_and_callback.second();
1540                 }
1541         }
1542
1543         // Reduce the number of callbacks by filtering duplicates. The reason
1544         // why we bother doing this is that Qt seemingly can get into a state
1545         // where its builds up an essentially unbounded queue of signals,
1546         // consuming more and more memory, and there's no good way of collapsing
1547         // user-defined signals or limiting the length of the queue.
1548         if (transition_names_updated_callback) {
1549                 vector<string> transition_names = global_mixer->get_transition_names();
1550                 bool changed = false;
1551                 if (transition_names.size() != last_transition_names.size()) {
1552                         changed = true;
1553                 } else {
1554                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1555                                 if (transition_names[i] != last_transition_names[i]) {
1556                                         changed = true;
1557                                         break;
1558                                 }
1559                         }
1560                 }
1561                 if (changed) {
1562                         transition_names_updated_callback(transition_names);
1563                         last_transition_names = transition_names;
1564                 }
1565         }
1566         if (name_updated_callback) {
1567                 string name = global_mixer->get_channel_name(channel);
1568                 if (name != last_name) {
1569                         name_updated_callback(name);
1570                         last_name = name;
1571                 }
1572         }
1573         if (color_updated_callback) {
1574                 string color = global_mixer->get_channel_color(channel);
1575                 if (color != last_color) {
1576                         color_updated_callback(color);
1577                         last_color = color;
1578                 }
1579         }
1580 }
1581
1582 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1583 {
1584         unique_lock<mutex> lock(frame_mutex);
1585         if (!has_current_frame && !has_ready_frame) {
1586                 return false;
1587         }
1588
1589         if (has_current_frame && has_ready_frame) {
1590                 // We have a new ready frame. Toss the current one.
1591                 parent->release_display_frame(&current_frame);
1592                 has_current_frame = false;
1593         }
1594         if (has_ready_frame) {
1595                 assert(!has_current_frame);
1596                 current_frame = ready_frame;
1597                 ready_frame.ready_fence.reset();  // Drop the refcount.
1598                 ready_frame.input_frames.clear();  // Drop the refcounts.
1599                 has_current_frame = true;
1600                 has_ready_frame = false;
1601         }
1602
1603         *frame = current_frame;
1604         return true;
1605 }
1606
1607 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1608 {
1609         unique_lock<mutex> lock(frame_mutex);
1610         new_frame_ready_callbacks[key] = callback;
1611 }
1612
1613 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1614 {
1615         unique_lock<mutex> lock(frame_mutex);
1616         new_frame_ready_callbacks.erase(key);
1617 }
1618
1619 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1620 {
1621         transition_names_updated_callback = callback;
1622 }
1623
1624 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1625 {
1626         name_updated_callback = callback;
1627 }
1628
1629 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1630 {
1631         color_updated_callback = callback;
1632 }
1633
1634 mutex RefCountedGLsync::fence_lock;