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