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 "flags.h"
  43 #include "input_mapping.h"
  44 #include "pbo_frame_allocator.h"
  45 #include "ref_counted_gl_sync.h"
  46 #include "resampling_queue.h"
  47 #include "timebase.h"
  48 #include "timecode_renderer.h"
  49 #include "video_encoder.h"
  50
  51 class IDeckLink;
  52 class QOpenGLContext;
  53
  54 using namespace movit;
  55 using namespace std;
  56 using namespace std::chrono;
  57 using namespace std::placeholders;
  58 using namespace bmusb;
  59
  60 Mixer *global_mixer = nullptr;
  61 bool uses_mlock = false;
  62
  63 namespace {
  64
  65 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  66 {
  67         if (interlaced) {
  68                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  69                         input_state->buffered_frames[card_index][frame_num] =
  70                                 input_state->buffered_frames[card_index][frame_num - 1];
  71                 }
  72                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  73         } else {
  74                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  75                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  76                 }
  77         }
  78 }
  79
  80 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height)
  81 {
  82         if (userdata->tex_y[field] == 0 ||
  83             userdata->tex_cbcr[field] == 0 ||
  84             width != userdata->last_width[field] ||
  85             height != userdata->last_height[field]) {
  86                 size_t cbcr_width = width / 2;
  87
  88                 // We changed resolution since last use of this texture, so we need to create
  89                 // a new object. Note that this each card has its own PBOFrameAllocator,
  90                 // we don't need to worry about these flip-flopping between resolutions.
  91                 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
  92                 check_error();
  93                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
  94                 check_error();
  95                 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
  96                 check_error();
  97                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
  98                 check_error();
  99                 userdata->last_width[field] = width;
 100                 userdata->last_height[field] = height;
 101         }
 102 }
 103
 104 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLintptr offset)
 105 {
 106         if (interlaced_stride) {
 107                 stride *= 2;
 108         }
 109         if (global_flags.flush_pbos) {
 110                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 111                 check_error();
 112         }
 113
 114         glBindTexture(GL_TEXTURE_2D, tex);
 115         check_error();
 116         if (interlaced_stride) {
 117                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 118                 check_error();
 119         } else {
 120                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 121                 check_error();
 122         }
 123
 124         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(offset));
 125         check_error();
 126         glBindTexture(GL_TEXTURE_2D, 0);
 127         check_error();
 128         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 129         check_error();
 130 }
 131
 132 }  // namespace
 133
 134 void QueueLengthPolicy::update_policy(unsigned queue_length)
 135 {
 136         if (queue_length == 0) {  // Starvation.
 137                 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
 138                         ++safe_queue_length;
 139                         fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
 140                                 card_index, safe_queue_length);
 141                 }
 142                 frames_with_at_least_one = 0;
 143                 been_at_safe_point_since_last_starvation = false;
 144                 return;
 145         }
 146         if (queue_length >= 1) {
 147                 if (queue_length >= safe_queue_length) {
 148                         been_at_safe_point_since_last_starvation = true;
 149                 }
 150                 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
 151                         --safe_queue_length;
 152                         fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
 153                                 card_index, safe_queue_length);
 154                         frames_with_at_least_one = 0;
 155                 }
 156         } else {
 157                 frames_with_at_least_one = 0;
 158         }
 159 }
 160
 161 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 162         : httpd(),
 163           num_cards(num_cards),
 164           mixer_surface(create_surface(format)),
 165           h264_encoder_surface(create_surface(format)),
 166           decklink_output_surface(create_surface(format)),
 167           audio_mixer(num_cards)
 168 {
 169         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 170         check_error();
 171
 172         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 173         // will be halved when sampling them, and we need to compensate here.
 174         movit_texel_subpixel_precision /= 2.0;
 175
 176         resource_pool.reset(new ResourcePool);
 177         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 178         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 179                 output_channel[i].parent = this;
 180                 output_channel[i].channel = i;
 181         }
 182
 183         ImageFormat inout_format;
 184         inout_format.color_space = COLORSPACE_sRGB;
 185         inout_format.gamma_curve = GAMMA_sRGB;
 186
 187         // Display chain; shows the live output produced by the main chain (its RGBA version).
 188         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 189         check_error();
 190         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, global_flags.width, global_flags.height);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
 191         display_chain->add_input(display_input);
 192         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 193         display_chain->set_dither_bits(0);  // Don't bother.
 194         display_chain->finalize();
 195
 196         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));
 197
 198         // Start listening for clients only once VideoEncoder has written its header, if any.
 199         httpd.start(9095);
 200
 201         // First try initializing the then PCI devices, then USB, then
 202         // fill up with fake cards until we have the desired number of cards.
 203         unsigned num_pci_devices = 0;
 204         unsigned card_index = 0;
 205
 206         {
 207                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 208                 if (decklink_iterator != nullptr) {
 209                         for ( ; card_index < num_cards; ++card_index) {
 210                                 IDeckLink *decklink;
 211                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 212                                         break;
 213                                 }
 214
 215                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 216                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 217                                 output->set_device(decklink);
 218                                 configure_card(card_index, capture, /*is_fake_capture=*/false, output);
 219                                 ++num_pci_devices;
 220                         }
 221                         decklink_iterator->Release();
 222                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 223                 } else {
 224                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 225                 }
 226         }
 227
 228         unsigned num_usb_devices = BMUSBCapture::num_cards();
 229         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 230                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 231                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 232                 configure_card(card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
 233         }
 234         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 235
 236         unsigned num_fake_cards = 0;
 237         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 238                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 239                 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
 240         }
 241
 242         if (num_fake_cards > 0) {
 243                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 244         }
 245
 246         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 247         BMUSBCapture::start_bm_thread();
 248
 249         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 250                 cards[card_index].queue_length_policy.reset(card_index);
 251         }
 252
 253         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 254
 255         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 256         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 257         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 258
 259         if (global_flags.enable_alsa_output) {
 260                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 261         }
 262         if (global_flags.output_card != -1) {
 263                 desired_output_card_index = global_flags.output_card;
 264                 set_output_card_internal(global_flags.output_card);
 265         }
 266 }
 267
 268 Mixer::~Mixer()
 269 {
 270         BMUSBCapture::stop_bm_thread();
 271
 272         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 273                 {
 274                         unique_lock<mutex> lock(card_mutex);
 275                         cards[card_index].should_quit = true;  // Unblock thread.
 276                         cards[card_index].new_frames_changed.notify_all();
 277                 }
 278                 cards[card_index].capture->stop_dequeue_thread();
 279                 if (cards[card_index].output) {
 280                         cards[card_index].output->end_output();
 281                         cards[card_index].output.reset();
 282                 }
 283         }
 284
 285         video_encoder.reset(nullptr);
 286 }
 287
 288 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture, DeckLinkOutput *output)
 289 {
 290         printf("Configuring card %d...\n", card_index);
 291
 292         CaptureCard *card = &cards[card_index];
 293         if (card->capture != nullptr) {
 294                 card->capture->stop_dequeue_thread();
 295         }
 296         card->capture.reset(capture);
 297         card->is_fake_capture = is_fake_capture;
 298         if (card->output.get() != output) {
 299                 card->output.reset(output);
 300         }
 301         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 302         if (card->frame_allocator == nullptr) {
 303                 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 304         }
 305         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 306         if (card->surface == nullptr) {
 307                 card->surface = create_surface_with_same_format(mixer_surface);
 308         }
 309         while (!card->new_frames.empty()) card->new_frames.pop_front();
 310         card->last_timecode = -1;
 311         card->capture->configure_card();
 312
 313         // NOTE: start_bm_capture() happens in thread_func().
 314
 315         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 316         audio_mixer.reset_resampler(device);
 317         audio_mixer.set_display_name(device, card->capture->get_description());
 318         audio_mixer.trigger_state_changed_callback();
 319 }
 320
 321 void Mixer::set_output_card_internal(int card_index)
 322 {
 323         // We don't really need to take card_mutex, since we're in the mixer
 324         // thread and don't mess with any queues (which is the only thing that happens
 325         // from other threads), but it's probably the safest in the long run.
 326         unique_lock<mutex> lock(card_mutex);
 327         if (output_card_index != -1) {
 328                 // Switch the old card from output to input.
 329                 CaptureCard *old_card = &cards[output_card_index];
 330                 old_card->output->end_output();
 331
 332                 // Stop the fake card that we put into place.
 333                 // This needs to _not_ happen under the mutex, to avoid deadlock
 334                 // (delivering the last frame needs to take the mutex).
 335                 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
 336                 lock.unlock();
 337                 fake_capture->stop_dequeue_thread();
 338                 lock.lock();
 339                 old_card->capture = move(old_card->parked_capture);
 340                 old_card->is_fake_capture = false;
 341                 old_card->capture->start_bm_capture();
 342         }
 343         if (card_index != -1) {
 344                 CaptureCard *card = &cards[card_index];
 345                 bmusb::CaptureInterface *capture = card->capture.get();
 346                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 347                 // several seconds to complete (blocking on DisableVideoInput);
 348                 // see if we can maybe do it asynchronously.
 349                 lock.unlock();
 350                 capture->stop_dequeue_thread();
 351                 lock.lock();
 352                 card->parked_capture = move(card->capture);
 353                 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 354                 configure_card(card_index, fake_capture, /*is_fake_capture=*/true, card->output.release());
 355                 card->queue_length_policy.reset(card_index);
 356                 card->capture->start_bm_capture();
 357                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 358                 card->output->start_output(desired_output_video_mode, pts_int);
 359         }
 360         output_card_index = card_index;
 361 }
 362
 363 namespace {
 364
 365 int unwrap_timecode(uint16_t current_wrapped, int last)
 366 {
 367         uint16_t last_wrapped = last & 0xffff;
 368         if (current_wrapped > last_wrapped) {
 369                 return (last & ~0xffff) | current_wrapped;
 370         } else {
 371                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 372         }
 373 }
 374
 375 }  // namespace
 376
 377 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 378                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 379                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 380 {
 381         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 382         CaptureCard *card = &cards[card_index];
 383
 384         if (is_mode_scanning[card_index]) {
 385                 if (video_format.has_signal) {
 386                         // Found a stable signal, so stop scanning.
 387                         is_mode_scanning[card_index] = false;
 388                 } else {
 389                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 390                         steady_clock::time_point now = steady_clock::now();
 391                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 392                         if (sec_since_last_switch > switch_time_s) {
 393                                 // It isn't this mode; try the next one.
 394                                 mode_scanlist_index[card_index]++;
 395                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 396                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 397                                 last_mode_scan_change[card_index] = now;
 398                         }
 399                 }
 400         }
 401
 402         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 403         assert(frame_length > 0);
 404
 405         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;
 406         if (num_samples > OUTPUT_FREQUENCY / 10) {
 407                 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",
 408                         card_index, int(audio_frame.len), int(audio_offset),
 409                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 410                 if (video_frame.owner) {
 411                         video_frame.owner->release_frame(video_frame);
 412                 }
 413                 if (audio_frame.owner) {
 414                         audio_frame.owner->release_frame(audio_frame);
 415                 }
 416                 return;
 417         }
 418
 419         int dropped_frames = 0;
 420         if (card->last_timecode != -1) {
 421                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 422         }
 423
 424         // Number of samples per frame if we need to insert silence.
 425         // (Could be nonintegral, but resampling will save us then.)
 426         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 427
 428         if (dropped_frames > MAX_FPS * 2) {
 429                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 430                         card_index, card->last_timecode, timecode);
 431                 audio_mixer.reset_resampler(device);
 432                 dropped_frames = 0;
 433         } else if (dropped_frames > 0) {
 434                 // Insert silence as needed.
 435                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 436                         card_index, dropped_frames, timecode);
 437
 438                 bool success;
 439                 do {
 440                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 441                 } while (!success);
 442         }
 443
 444         audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 445
 446         // Done with the audio, so release it.
 447         if (audio_frame.owner) {
 448                 audio_frame.owner->release_frame(audio_frame);
 449         }
 450
 451         card->last_timecode = timecode;
 452
 453         size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
 454         if (video_frame.len - video_offset == 0 ||
 455             video_frame.len - video_offset != expected_length) {
 456                 if (video_frame.len != 0) {
 457                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 458                                 card_index, video_frame.len - video_offset, expected_length);
 459                 }
 460                 if (video_frame.owner) {
 461                         video_frame.owner->release_frame(video_frame);
 462                 }
 463
 464                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 465                 // so that pts can go up accordingly.
 466                 {
 467                         unique_lock<mutex> lock(card_mutex);
 468                         CaptureCard::NewFrame new_frame;
 469                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 470                         new_frame.length = frame_length;
 471                         new_frame.interlaced = false;
 472                         new_frame.dropped_frames = dropped_frames;
 473                         new_frame.received_timestamp = video_frame.received_timestamp;
 474                         card->new_frames.push_back(move(new_frame));
 475                         card->new_frames_changed.notify_all();
 476                 }
 477                 return;
 478         }
 479
 480         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 481
 482         unsigned num_fields = video_format.interlaced ? 2 : 1;
 483         steady_clock::time_point frame_upload_start;
 484         bool interlaced_stride = false;
 485         if (video_format.interlaced) {
 486                 // Send the two fields along as separate frames; the other side will need to add
 487                 // a deinterlacer to actually get this right.
 488                 assert(video_format.height % 2 == 0);
 489                 video_format.height /= 2;
 490                 assert(frame_length % 2 == 0);
 491                 frame_length /= 2;
 492                 num_fields = 2;
 493                 if (video_format.second_field_start == 1) {
 494                         interlaced_stride = true;
 495                 }
 496                 frame_upload_start = steady_clock::now();
 497         }
 498         userdata->last_interlaced = video_format.interlaced;
 499         userdata->last_has_signal = video_format.has_signal;
 500         userdata->last_is_connected = video_format.is_connected;
 501         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 502         userdata->last_frame_rate_den = video_format.frame_rate_den;
 503         RefCountedFrame frame(video_frame);
 504
 505         // Upload the textures.
 506         size_t cbcr_width = video_format.width / 2;
 507         size_t cbcr_offset = video_offset / 2;
 508         size_t y_offset = video_frame.size / 2 + video_offset / 2;
 509
 510         for (unsigned field = 0; field < num_fields; ++field) {
 511                 // Put the actual texture upload in a lambda that is executed in the main thread.
 512                 // It is entirely possible to do this in the same thread (and it might even be
 513                 // faster, depending on the GPU and driver), but it appears to be trickling
 514                 // driver bugs very easily.
 515                 //
 516                 // Note that this means we must hold on to the actual frame data in <userdata>
 517                 // until the upload command is run, but we hold on to <frame> much longer than that
 518                 // (in fact, all the way until we no longer use the texture in rendering).
 519                 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
 520                         unsigned field_start_line;
 521                         if (field == 1) {
 522                                 field_start_line = video_format.second_field_start;
 523                         } else {
 524                                 field_start_line = video_format.extra_lines_top;
 525                         }
 526                         size_t field_y_start = y_offset + video_format.width * field_start_line;
 527                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 528
 529                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height);
 530
 531                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 532                         check_error();
 533
 534                         upload_texture(userdata->tex_y[field], video_format.width, video_format.height, video_format.width, interlaced_stride, GL_RED, field_y_start);
 535                         upload_texture(userdata->tex_cbcr[field], cbcr_width, video_format.height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, field_cbcr_start);
 536
 537                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 538                         check_error();
 539                 };
 540
 541                 if (field == 1) {
 542                         // Don't upload the second field as fast as we can; wait until
 543                         // the field time has approximately passed. (Otherwise, we could
 544                         // get timing jitter against the other sources, and possibly also
 545                         // against the video display, although the latter is not as critical.)
 546                         // This requires our system clock to be reasonably close to the
 547                         // video clock, but that's not an unreasonable assumption.
 548                         steady_clock::time_point second_field_start = frame_upload_start +
 549                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 550                         this_thread::sleep_until(second_field_start);
 551                 }
 552
 553                 {
 554                         unique_lock<mutex> lock(card_mutex);
 555                         CaptureCard::NewFrame new_frame;
 556                         new_frame.frame = frame;
 557                         new_frame.length = frame_length;
 558                         new_frame.field = field;
 559                         new_frame.interlaced = video_format.interlaced;
 560                         new_frame.upload_func = upload_func;
 561                         new_frame.dropped_frames = dropped_frames;
 562                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 563                         card->new_frames.push_back(move(new_frame));
 564                         card->new_frames_changed.notify_all();
 565                 }
 566         }
 567 }
 568
 569 void Mixer::bm_hotplug_add(libusb_device *dev)
 570 {
 571         lock_guard<mutex> lock(hotplug_mutex);
 572         hotplugged_cards.push_back(dev);
 573 }
 574
 575 void Mixer::bm_hotplug_remove(unsigned card_index)
 576 {
 577         cards[card_index].new_frames_changed.notify_all();
 578 }
 579
 580 void Mixer::thread_func()
 581 {
 582         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 583
 584         eglBindAPI(EGL_OPENGL_API);
 585         QOpenGLContext *context = create_context(mixer_surface);
 586         if (!make_current(context, mixer_surface)) {
 587                 printf("oops\n");
 588                 exit(1);
 589         }
 590
 591         // Start the actual capture. (We don't want to do it before we're actually ready
 592         // to process output frames.)
 593         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 594                 if (int(card_index) != output_card_index) {
 595                         cards[card_index].capture->start_bm_capture();
 596                 }
 597         }
 598
 599         steady_clock::time_point start, now;
 600         start = steady_clock::now();
 601
 602         int stats_dropped_frames = 0;
 603
 604         while (!should_quit) {
 605                 if (desired_output_card_index != output_card_index) {
 606                         set_output_card_internal(desired_output_card_index);
 607                 }
 608                 if (output_card_index != -1 &&
 609                     desired_output_video_mode != output_video_mode) {
 610                         DeckLinkOutput *output = cards[output_card_index].output.get();
 611                         output->end_output();
 612                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 613                         output->start_output(desired_output_video_mode, pts_int);
 614                 }
 615
 616                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 617                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 618
 619                 bool master_card_is_output;
 620                 unsigned master_card_index;
 621                 if (output_card_index != -1) {
 622                         master_card_is_output = true;
 623                         master_card_index = output_card_index;
 624                 } else {
 625                         master_card_is_output = false;
 626                         master_card_index = theme->map_signal(master_clock_channel);
 627                         assert(master_card_index < num_cards);
 628                 }
 629
 630                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
 631                 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);
 632                 stats_dropped_frames += output_frame_info.dropped_frames;
 633
 634                 handle_hotplugged_cards();
 635
 636                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 637                         if (card_index == master_card_index || !has_new_frame[card_index]) {
 638                                 continue;
 639                         }
 640                         if (new_frames[card_index].frame->len == 0) {
 641                                 ++new_frames[card_index].dropped_frames;
 642                         }
 643                         if (new_frames[card_index].dropped_frames > 0) {
 644                                 printf("Card %u dropped %d frames before this\n",
 645                                         card_index, int(new_frames[card_index].dropped_frames));
 646                         }
 647                 }
 648
 649                 // If the first card is reporting a corrupted or otherwise dropped frame,
 650                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 651                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
 652                         ++stats_dropped_frames;
 653                         pts_int += new_frames[master_card_index].length;
 654                         continue;
 655                 }
 656
 657                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 658                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
 659                                 continue;
 660
 661                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
 662                         assert(new_frame->frame != nullptr);
 663                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
 664                         check_error();
 665
 666                         // The new texture might need uploading before use.
 667                         if (new_frame->upload_func) {
 668                                 new_frame->upload_func();
 669                                 new_frame->upload_func = nullptr;
 670                         }
 671                 }
 672
 673                 int64_t frame_duration = output_frame_info.frame_duration;
 674                 render_one_frame(frame_duration);
 675                 ++frame_num;
 676                 pts_int += frame_duration;
 677
 678                 now = steady_clock::now();
 679                 double elapsed = duration<double>(now - start).count();
 680                 if (frame_num % 100 == 0) {
 681                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
 682                                 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
 683                                 1e3 * elapsed / frame_num);
 684                 //      chain->print_phase_timing();
 685
 686                         // Check our memory usage, to see if we are close to our mlockall()
 687                         // limit (if at all set).
 688                         rusage used;
 689                         if (getrusage(RUSAGE_SELF, &used) == -1) {
 690                                 perror("getrusage(RUSAGE_SELF)");
 691                                 assert(false);
 692                         }
 693
 694                         if (uses_mlock) {
 695                                 rlimit limit;
 696                                 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
 697                                         perror("getrlimit(RLIMIT_MEMLOCK)");
 698                                         assert(false);
 699                                 }
 700
 701                                 if (limit.rlim_cur == 0) {
 702                                         printf(", using %ld MB memory (locked)",
 703                                                 long(used.ru_maxrss / 1024));
 704                                 } else {
 705                                         printf(", using %ld / %ld MB lockable memory (%.1f%%)",
 706                                                 long(used.ru_maxrss / 1024),
 707                                                 long(limit.rlim_cur / 1048576),
 708                                                 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
 709                                 }
 710                         } else {
 711                                 printf(", using %ld MB memory (not locked)",
 712                                         long(used.ru_maxrss / 1024));
 713                         }
 714
 715                         printf("\n");
 716                 }
 717
 718
 719                 if (should_cut.exchange(false)) {  // Test and clear.
 720                         video_encoder->do_cut(frame_num);
 721                 }
 722
 723 #if 0
 724                 // Reset every 100 frames, so that local variations in frame times
 725                 // (especially for the first few frames, when the shaders are
 726                 // compiled etc.) don't make it hard to measure for the entire
 727                 // remaining duration of the program.
 728                 if (frame == 10000) {
 729                         frame = 0;
 730                         start = now;
 731                 }
 732 #endif
 733                 check_error();
 734         }
 735
 736         resource_pool->clean_context();
 737 }
 738
 739 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
 740 {
 741         if (output_card_index != -1) {
 742                 // The output card (ie., cards[output_card_index].output) is the master clock,
 743                 // so no input card (ie., cards[card_index].capture) is.
 744                 return false;
 745         }
 746         return (card_index == master_card_index);
 747 }
 748
 749 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
 750 {
 751         // Count the number of frames in the queue, including any frames
 752         // we dropped. It's hard to know exactly how we should deal with
 753         // dropped (corrupted) input frames; they don't help our goal of
 754         // avoiding starvation, but they still add to the problem of latency.
 755         // Since dropped frames is going to mean a bump in the signal anyway,
 756         // we err on the side of having more stable latency instead.
 757         unsigned queue_length = 0;
 758         for (const CaptureCard::NewFrame &frame : card->new_frames) {
 759                 queue_length += frame.dropped_frames + 1;
 760         }
 761         card->queue_length_policy.update_policy(queue_length);
 762
 763         // If needed, drop frames until the queue is below the safe limit.
 764         // We prefer to drop from the head, because all else being equal,
 765         // we'd like more recent frames (less latency).
 766         unsigned dropped_frames = 0;
 767         while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
 768                 assert(!card->new_frames.empty());
 769                 assert(queue_length > card->new_frames.front().dropped_frames);
 770                 queue_length -= card->new_frames.front().dropped_frames;
 771
 772                 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
 773                         // No need to drop anything.
 774                         break;
 775                 }
 776
 777                 card->new_frames.pop_front();
 778                 card->new_frames_changed.notify_all();
 779                 --queue_length;
 780                 ++dropped_frames;
 781         }
 782
 783         if (dropped_frames > 0) {
 784                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
 785                         card_index, dropped_frames);
 786         }
 787 }
 788
 789
 790 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])
 791 {
 792         OutputFrameInfo output_frame_info;
 793 start:
 794         unique_lock<mutex> lock(card_mutex, defer_lock);
 795         if (master_card_is_output) {
 796                 // Clocked to the output, so wait for it to be ready for the next frame.
 797                 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);
 798                 lock.lock();
 799         } else {
 800                 // Wait for the master card to have a new frame.
 801                 // TODO: Add a timeout.
 802                 output_frame_info.is_preroll = false;
 803                 lock.lock();
 804                 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(); });
 805         }
 806
 807         if (master_card_is_output) {
 808                 handle_hotplugged_cards();
 809         } else if (cards[master_card_index].new_frames.empty()) {
 810                 // We were woken up, but not due to a new frame. Deal with it
 811                 // and then restart.
 812                 assert(cards[master_card_index].capture->get_disconnected());
 813                 handle_hotplugged_cards();
 814                 goto start;
 815         }
 816
 817         if (!master_card_is_output) {
 818                 output_frame_info.frame_timestamp =
 819                         cards[master_card_index].new_frames.front().received_timestamp;
 820         }
 821
 822         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 823                 CaptureCard *card = &cards[card_index];
 824                 if (input_card_is_master_clock(card_index, master_card_index)) {
 825                         // We don't use the queue length policy for the master card,
 826                         // but we will if it stops being the master. Thus, clear out
 827                         // the policy in case we switch in the future.
 828                         card->queue_length_policy.reset(card_index);
 829                         assert(!card->new_frames.empty());
 830                 } else {
 831                         trim_queue(card, card_index);
 832                 }
 833                 if (!card->new_frames.empty()) {
 834                         new_frames[card_index] = move(card->new_frames.front());
 835                         has_new_frame[card_index] = true;
 836                         card->new_frames.pop_front();
 837                         card->new_frames_changed.notify_all();
 838                 }
 839         }
 840
 841         if (!master_card_is_output) {
 842                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
 843                 output_frame_info.frame_duration = new_frames[master_card_index].length;
 844         }
 845
 846         // This might get off by a fractional sample when changing master card
 847         // between ones with different frame rates, but that's fine.
 848         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
 849         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
 850         fractional_samples = num_samples_times_timebase % TIMEBASE;
 851         assert(output_frame_info.num_samples >= 0);
 852
 853         return output_frame_info;
 854 }
 855
 856 void Mixer::handle_hotplugged_cards()
 857 {
 858         // Check for cards that have been disconnected since last frame.
 859         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 860                 CaptureCard *card = &cards[card_index];
 861                 if (card->capture->get_disconnected()) {
 862                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
 863                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 864                         configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
 865                         card->queue_length_policy.reset(card_index);
 866                         card->capture->start_bm_capture();
 867                 }
 868         }
 869
 870         // Check for cards that have been connected since last frame.
 871         vector<libusb_device *> hotplugged_cards_copy;
 872         {
 873                 lock_guard<mutex> lock(hotplug_mutex);
 874                 swap(hotplugged_cards, hotplugged_cards_copy);
 875         }
 876         for (libusb_device *new_dev : hotplugged_cards_copy) {
 877                 // Look for a fake capture card where we can stick this in.
 878                 int free_card_index = -1;
 879                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 880                         if (cards[card_index].is_fake_capture) {
 881                                 free_card_index = card_index;
 882                                 break;
 883                         }
 884                 }
 885
 886                 if (free_card_index == -1) {
 887                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
 888                         libusb_unref_device(new_dev);
 889                 } else {
 890                         // BMUSBCapture takes ownership.
 891                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
 892                         CaptureCard *card = &cards[free_card_index];
 893                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
 894                         configure_card(free_card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
 895                         card->queue_length_policy.reset(free_card_index);
 896                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
 897                         capture->start_bm_capture();
 898                 }
 899         }
 900 }
 901
 902
 903 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)
 904 {
 905         // Resample the audio as needed, including from previously dropped frames.
 906         assert(num_cards > 0);
 907         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
 908                 const bool dropped_frame = (frame_num != dropped_frames);
 909                 {
 910                         // Signal to the audio thread to process this frame.
 911                         // Note that if the frame is a dropped frame, we signal that
 912                         // we don't want to use this frame as base for adjusting
 913                         // the resampler rate. The reason for this is that the timing
 914                         // of these frames is often way too late; they typically don't
 915                         // “arrive” before we synthesize them. Thus, we could end up
 916                         // in a situation where we have inserted e.g. five audio frames
 917                         // into the queue before we then start pulling five of them
 918                         // back out. This makes ResamplingQueue overestimate the delay,
 919                         // causing undue resampler changes. (We _do_ use the last,
 920                         // non-dropped frame; perhaps we should just discard that as well,
 921                         // since dropped frames are expected to be rare, and it might be
 922                         // better to just wait until we have a slightly more normal situation).
 923                         unique_lock<mutex> lock(audio_mutex);
 924                         bool adjust_rate = !dropped_frame && !is_preroll;
 925                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
 926                         audio_task_queue_changed.notify_one();
 927                 }
 928                 if (dropped_frame) {
 929                         // For dropped frames, increase the pts. Note that if the format changed
 930                         // in the meantime, we have no way of detecting that; we just have to
 931                         // assume the frame length is always the same.
 932                         pts_int += length_per_frame;
 933                 }
 934         }
 935 }
 936
 937 void Mixer::render_one_frame(int64_t duration)
 938 {
 939         // Determine the time code for this frame before we start rendering.
 940         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
 941         if (display_timecode_on_stdout) {
 942                 printf("Timecode: '%s'\n", timecode_text.c_str());
 943         }
 944
 945         // Get the main chain from the theme, and set its state immediately.
 946         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
 947         EffectChain *chain = theme_main_chain.chain;
 948         theme_main_chain.setup_chain();
 949         //theme_main_chain.chain->enable_phase_timing(true);
 950
 951         GLuint y_tex, cbcr_tex;
 952         bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
 953         assert(got_frame);
 954
 955         // Render main chain.
 956         GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, global_flags.width, global_flags.height);
 957         GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, global_flags.width, global_flags.height);  // Saves texture bandwidth, although dithering gets messed up.
 958         GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 959         check_error();
 960         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
 961
 962         if (display_timecode_in_stream) {
 963                 // Render the timecode on top.
 964                 timecode_renderer->render_timecode(fbo, timecode_text);
 965         }
 966
 967         resource_pool->release_fbo(fbo);
 968
 969         chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
 970         if (output_card_index != -1) {
 971                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, theme_main_chain.input_frames, pts_int, duration);
 972         }
 973         resource_pool->release_2d_texture(cbcr_full_tex);
 974
 975         // Set the right state for rgba_tex.
 976         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 977         glBindTexture(GL_TEXTURE_2D, rgba_tex);
 978         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 979         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 980         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 981
 982         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
 983         RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
 984
 985         // The live frame just shows the RGBA texture we just rendered.
 986         // It owns rgba_tex now.
 987         DisplayFrame live_frame;
 988         live_frame.chain = display_chain.get();
 989         live_frame.setup_chain = [this, rgba_tex]{
 990                 display_input->set_texture_num(rgba_tex);
 991         };
 992         live_frame.ready_fence = fence;
 993         live_frame.input_frames = {};
 994         live_frame.temp_textures = { rgba_tex };
 995         output_channel[OUTPUT_LIVE].output_frame(live_frame);
 996
 997         // Set up preview and any additional channels.
 998         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
 999                 DisplayFrame display_frame;
1000                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1001                 display_frame.chain = chain.chain;
1002                 display_frame.setup_chain = chain.setup_chain;
1003                 display_frame.ready_fence = fence;
1004                 display_frame.input_frames = chain.input_frames;
1005                 display_frame.temp_textures = {};
1006                 output_channel[i].output_frame(display_frame);
1007         }
1008 }
1009
1010 void Mixer::audio_thread_func()
1011 {
1012         pthread_setname_np(pthread_self(), "Mixer_Audio");
1013
1014         while (!should_quit) {
1015                 AudioTask task;
1016
1017                 {
1018                         unique_lock<mutex> lock(audio_mutex);
1019                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1020                         if (should_quit) {
1021                                 return;
1022                         }
1023                         task = audio_task_queue.front();
1024                         audio_task_queue.pop();
1025                 }
1026
1027                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1028                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1029                 vector<float> samples_out = audio_mixer.get_output(
1030                         task.frame_timestamp,
1031                         task.num_samples,
1032                         rate_adjustment_policy);
1033
1034                 // Send the samples to the sound card, then add them to the output.
1035                 if (alsa) {
1036                         alsa->write(samples_out);
1037                 }
1038                 if (output_card_index != -1) {
1039                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1040                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1041                 }
1042                 video_encoder->add_audio(task.pts_int, move(samples_out));
1043         }
1044 }
1045
1046 void Mixer::release_display_frame(DisplayFrame *frame)
1047 {
1048         for (GLuint texnum : frame->temp_textures) {
1049                 resource_pool->release_2d_texture(texnum);
1050         }
1051         frame->temp_textures.clear();
1052         frame->ready_fence.reset();
1053         frame->input_frames.clear();
1054 }
1055
1056 void Mixer::start()
1057 {
1058         mixer_thread = thread(&Mixer::thread_func, this);
1059         audio_thread = thread(&Mixer::audio_thread_func, this);
1060 }
1061
1062 void Mixer::quit()
1063 {
1064         should_quit = true;
1065         audio_task_queue_changed.notify_one();
1066         mixer_thread.join();
1067         audio_thread.join();
1068 }
1069
1070 void Mixer::transition_clicked(int transition_num)
1071 {
1072         theme->transition_clicked(transition_num, pts());
1073 }
1074
1075 void Mixer::channel_clicked(int preview_num)
1076 {
1077         theme->channel_clicked(preview_num);
1078 }
1079
1080 void Mixer::start_mode_scanning(unsigned card_index)
1081 {
1082         assert(card_index < num_cards);
1083         if (is_mode_scanning[card_index]) {
1084                 return;
1085         }
1086         is_mode_scanning[card_index] = true;
1087         mode_scanlist[card_index].clear();
1088         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1089                 mode_scanlist[card_index].push_back(mode.first);
1090         }
1091         assert(!mode_scanlist[card_index].empty());
1092         mode_scanlist_index[card_index] = 0;
1093         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1094         last_mode_scan_change[card_index] = steady_clock::now();
1095 }
1096
1097 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1098 {
1099         assert(desired_output_card_index != -1);
1100         unique_lock<mutex> lock(card_mutex);
1101         return cards[desired_output_card_index].output->get_available_video_modes();
1102 }
1103
1104 Mixer::OutputChannel::~OutputChannel()
1105 {
1106         if (has_current_frame) {
1107                 parent->release_display_frame(&current_frame);
1108         }
1109         if (has_ready_frame) {
1110                 parent->release_display_frame(&ready_frame);
1111         }
1112 }
1113
1114 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1115 {
1116         // Store this frame for display. Remove the ready frame if any
1117         // (it was seemingly never used).
1118         {
1119                 unique_lock<mutex> lock(frame_mutex);
1120                 if (has_ready_frame) {
1121                         parent->release_display_frame(&ready_frame);
1122                 }
1123                 ready_frame = frame;
1124                 has_ready_frame = true;
1125         }
1126
1127         if (new_frame_ready_callback) {
1128                 new_frame_ready_callback();
1129         }
1130
1131         // Reduce the number of callbacks by filtering duplicates. The reason
1132         // why we bother doing this is that Qt seemingly can get into a state
1133         // where its builds up an essentially unbounded queue of signals,
1134         // consuming more and more memory, and there's no good way of collapsing
1135         // user-defined signals or limiting the length of the queue.
1136         if (transition_names_updated_callback) {
1137                 vector<string> transition_names = global_mixer->get_transition_names();
1138                 bool changed = false;
1139                 if (transition_names.size() != last_transition_names.size()) {
1140                         changed = true;
1141                 } else {
1142                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1143                                 if (transition_names[i] != last_transition_names[i]) {
1144                                         changed = true;
1145                                         break;
1146                                 }
1147                         }
1148                 }
1149                 if (changed) {
1150                         transition_names_updated_callback(transition_names);
1151                         last_transition_names = transition_names;
1152                 }
1153         }
1154         if (name_updated_callback) {
1155                 string name = global_mixer->get_channel_name(channel);
1156                 if (name != last_name) {
1157                         name_updated_callback(name);
1158                         last_name = name;
1159                 }
1160         }
1161         if (color_updated_callback) {
1162                 string color = global_mixer->get_channel_color(channel);
1163                 if (color != last_color) {
1164                         color_updated_callback(color);
1165                         last_color = color;
1166                 }
1167         }
1168 }
1169
1170 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1171 {
1172         unique_lock<mutex> lock(frame_mutex);
1173         if (!has_current_frame && !has_ready_frame) {
1174                 return false;
1175         }
1176
1177         if (has_current_frame && has_ready_frame) {
1178                 // We have a new ready frame. Toss the current one.
1179                 parent->release_display_frame(&current_frame);
1180                 has_current_frame = false;
1181         }
1182         if (has_ready_frame) {
1183                 assert(!has_current_frame);
1184                 current_frame = ready_frame;
1185                 ready_frame.ready_fence.reset();  // Drop the refcount.
1186                 ready_frame.input_frames.clear();  // Drop the refcounts.
1187                 has_current_frame = true;
1188                 has_ready_frame = false;
1189         }
1190
1191         *frame = current_frame;
1192         return true;
1193 }
1194
1195 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1196 {
1197         new_frame_ready_callback = callback;
1198 }
1199
1200 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1201 {
1202         transition_names_updated_callback = callback;
1203 }
1204
1205 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1206 {
1207         name_updated_callback = callback;
1208 }
1209
1210 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1211 {
1212         color_updated_callback = callback;
1213 }
1214
1215 mutex RefCountedGLsync::fence_lock;