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 "v210_converter.h"
  50 #include "video_encoder.h"
  51
  52 class IDeckLink;
  53 class QOpenGLContext;
  54
  55 using namespace movit;
  56 using namespace std;
  57 using namespace std::chrono;
  58 using namespace std::placeholders;
  59 using namespace bmusb;
  60
  61 Mixer *global_mixer = nullptr;
  62 bool uses_mlock = false;
  63
  64 namespace {
  65
  66 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  67 {
  68         if (interlaced) {
  69                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  70                         input_state->buffered_frames[card_index][frame_num] =
  71                                 input_state->buffered_frames[card_index][frame_num - 1];
  72                 }
  73                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  74         } else {
  75                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  76                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  77                 }
  78         }
  79 }
  80
  81 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height)
  82 {
  83         bool first;
  84         if (global_flags.ten_bit_input) {
  85                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  86         } else {
  87                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
  88         }
  89
  90         if (first ||
  91             width != userdata->last_width[field] ||
  92             height != userdata->last_height[field]) {
  93                 // We changed resolution since last use of this texture, so we need to create
  94                 // a new object. Note that this each card has its own PBOFrameAllocator,
  95                 // we don't need to worry about these flip-flopping between resolutions.
  96                 if (global_flags.ten_bit_input) {
  97                         const size_t v210_width = v210Converter::get_minimum_v210_texture_width(width);
  98
  99                         glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 100                         check_error();
 101                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 102                         check_error();
 103                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 104                         check_error();
 105                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 106                         check_error();
 107                 } else {
 108                         size_t cbcr_width = width / 2;
 109
 110                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 111                         check_error();
 112                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 113                         check_error();
 114                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 115                         check_error();
 116                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 117                         check_error();
 118                 }
 119                 userdata->last_width[field] = width;
 120                 userdata->last_height[field] = height;
 121         }
 122 }
 123
 124 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 125 {
 126         if (interlaced_stride) {
 127                 stride *= 2;
 128         }
 129         if (global_flags.flush_pbos) {
 130                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 131                 check_error();
 132         }
 133
 134         glBindTexture(GL_TEXTURE_2D, tex);
 135         check_error();
 136         if (interlaced_stride) {
 137                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 138                 check_error();
 139         } else {
 140                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 141                 check_error();
 142         }
 143
 144         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 145         check_error();
 146         glBindTexture(GL_TEXTURE_2D, 0);
 147         check_error();
 148         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 149         check_error();
 150 }
 151
 152 }  // namespace
 153
 154 void QueueLengthPolicy::update_policy(unsigned queue_length)
 155 {
 156         if (queue_length == 0) {  // Starvation.
 157                 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
 158                         ++safe_queue_length;
 159                         fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
 160                                 card_index, safe_queue_length);
 161                 }
 162                 frames_with_at_least_one = 0;
 163                 been_at_safe_point_since_last_starvation = false;
 164                 return;
 165         }
 166         if (queue_length >= 1) {
 167                 if (queue_length >= safe_queue_length) {
 168                         been_at_safe_point_since_last_starvation = true;
 169                 }
 170                 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
 171                         --safe_queue_length;
 172                         fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
 173                                 card_index, safe_queue_length);
 174                         frames_with_at_least_one = 0;
 175                 }
 176         } else {
 177                 frames_with_at_least_one = 0;
 178         }
 179 }
 180
 181 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 182         : httpd(),
 183           num_cards(num_cards),
 184           mixer_surface(create_surface(format)),
 185           h264_encoder_surface(create_surface(format)),
 186           decklink_output_surface(create_surface(format)),
 187           audio_mixer(num_cards)
 188 {
 189         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 190         check_error();
 191
 192         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 193         // will be halved when sampling them, and we need to compensate here.
 194         movit_texel_subpixel_precision /= 2.0;
 195
 196         resource_pool.reset(new ResourcePool);
 197         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 198         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 199                 output_channel[i].parent = this;
 200                 output_channel[i].channel = i;
 201         }
 202
 203         ImageFormat inout_format;
 204         inout_format.color_space = COLORSPACE_sRGB;
 205         inout_format.gamma_curve = GAMMA_sRGB;
 206
 207         // Display chain; shows the live output produced by the main chain (its RGBA version).
 208         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 209         check_error();
 210         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, global_flags.width, global_flags.height);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
 211         display_chain->add_input(display_input);
 212         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 213         display_chain->set_dither_bits(0);  // Don't bother.
 214         display_chain->finalize();
 215
 216         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));
 217
 218         // Start listening for clients only once VideoEncoder has written its header, if any.
 219         httpd.start(9095);
 220
 221         // First try initializing the then PCI devices, then USB, then
 222         // fill up with fake cards until we have the desired number of cards.
 223         unsigned num_pci_devices = 0;
 224         unsigned card_index = 0;
 225
 226         {
 227                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 228                 if (decklink_iterator != nullptr) {
 229                         for ( ; card_index < num_cards; ++card_index) {
 230                                 IDeckLink *decklink;
 231                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 232                                         break;
 233                                 }
 234
 235                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 236                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 237                                 output->set_device(decklink);
 238                                 configure_card(card_index, capture, /*is_fake_capture=*/false, output);
 239                                 ++num_pci_devices;
 240                         }
 241                         decklink_iterator->Release();
 242                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 243                 } else {
 244                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 245                 }
 246         }
 247
 248         unsigned num_usb_devices = BMUSBCapture::num_cards();
 249         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 250                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 251                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 252                 configure_card(card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
 253         }
 254         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 255
 256         unsigned num_fake_cards = 0;
 257         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 258                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 259                 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
 260         }
 261
 262         if (num_fake_cards > 0) {
 263                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 264         }
 265
 266         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 267         BMUSBCapture::start_bm_thread();
 268
 269         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 270                 cards[card_index].queue_length_policy.reset(card_index);
 271         }
 272
 273         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 274
 275         if (global_flags.ten_bit_input) {
 276                 if (!v210Converter::has_hardware_support()) {
 277                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 278                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 279                         exit(1);
 280                 }
 281                 v210_converter.reset(new v210Converter());
 282
 283                 // These are all the widths listed in the Blackmagic SDK documentation
 284                 // (section 2.7.3, “Display Modes”).
 285                 v210_converter->precompile_shader(720);
 286                 v210_converter->precompile_shader(1280);
 287                 v210_converter->precompile_shader(1920);
 288                 v210_converter->precompile_shader(2048);
 289                 v210_converter->precompile_shader(3840);
 290                 v210_converter->precompile_shader(4096);
 291         }
 292
 293         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 294         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 295         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 296
 297         if (global_flags.enable_alsa_output) {
 298                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 299         }
 300         if (global_flags.output_card != -1) {
 301                 desired_output_card_index = global_flags.output_card;
 302                 set_output_card_internal(global_flags.output_card);
 303         }
 304 }
 305
 306 Mixer::~Mixer()
 307 {
 308         BMUSBCapture::stop_bm_thread();
 309
 310         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 311                 {
 312                         unique_lock<mutex> lock(card_mutex);
 313                         cards[card_index].should_quit = true;  // Unblock thread.
 314                         cards[card_index].new_frames_changed.notify_all();
 315                 }
 316                 cards[card_index].capture->stop_dequeue_thread();
 317                 if (cards[card_index].output) {
 318                         cards[card_index].output->end_output();
 319                         cards[card_index].output.reset();
 320                 }
 321         }
 322
 323         video_encoder.reset(nullptr);
 324 }
 325
 326 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture, DeckLinkOutput *output)
 327 {
 328         printf("Configuring card %d...\n", card_index);
 329
 330         CaptureCard *card = &cards[card_index];
 331         if (card->capture != nullptr) {
 332                 card->capture->stop_dequeue_thread();
 333         }
 334         card->capture.reset(capture);
 335         card->is_fake_capture = is_fake_capture;
 336         if (card->output.get() != output) {
 337                 card->output.reset(output);
 338         }
 339         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 340         if (card->frame_allocator == nullptr) {
 341                 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 342         }
 343         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 344         if (card->surface == nullptr) {
 345                 card->surface = create_surface_with_same_format(mixer_surface);
 346         }
 347         while (!card->new_frames.empty()) card->new_frames.pop_front();
 348         card->last_timecode = -1;
 349         card->capture->set_pixel_format(global_flags.ten_bit_input ? PixelFormat_10BitYCbCr : PixelFormat_8BitYCbCr);
 350         card->capture->configure_card();
 351
 352         // NOTE: start_bm_capture() happens in thread_func().
 353
 354         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 355         audio_mixer.reset_resampler(device);
 356         audio_mixer.set_display_name(device, card->capture->get_description());
 357         audio_mixer.trigger_state_changed_callback();
 358 }
 359
 360 void Mixer::set_output_card_internal(int card_index)
 361 {
 362         // We don't really need to take card_mutex, since we're in the mixer
 363         // thread and don't mess with any queues (which is the only thing that happens
 364         // from other threads), but it's probably the safest in the long run.
 365         unique_lock<mutex> lock(card_mutex);
 366         if (output_card_index != -1) {
 367                 // Switch the old card from output to input.
 368                 CaptureCard *old_card = &cards[output_card_index];
 369                 old_card->output->end_output();
 370
 371                 // Stop the fake card that we put into place.
 372                 // This needs to _not_ happen under the mutex, to avoid deadlock
 373                 // (delivering the last frame needs to take the mutex).
 374                 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
 375                 lock.unlock();
 376                 fake_capture->stop_dequeue_thread();
 377                 lock.lock();
 378                 old_card->capture = move(old_card->parked_capture);
 379                 old_card->is_fake_capture = false;
 380                 old_card->capture->start_bm_capture();
 381         }
 382         if (card_index != -1) {
 383                 CaptureCard *card = &cards[card_index];
 384                 bmusb::CaptureInterface *capture = card->capture.get();
 385                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 386                 // several seconds to complete (blocking on DisableVideoInput);
 387                 // see if we can maybe do it asynchronously.
 388                 lock.unlock();
 389                 capture->stop_dequeue_thread();
 390                 lock.lock();
 391                 card->parked_capture = move(card->capture);
 392                 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 393                 configure_card(card_index, fake_capture, /*is_fake_capture=*/true, card->output.release());
 394                 card->queue_length_policy.reset(card_index);
 395                 card->capture->start_bm_capture();
 396                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 397                 card->output->start_output(desired_output_video_mode, pts_int);
 398         }
 399         output_card_index = card_index;
 400 }
 401
 402 namespace {
 403
 404 int unwrap_timecode(uint16_t current_wrapped, int last)
 405 {
 406         uint16_t last_wrapped = last & 0xffff;
 407         if (current_wrapped > last_wrapped) {
 408                 return (last & ~0xffff) | current_wrapped;
 409         } else {
 410                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 411         }
 412 }
 413
 414 }  // namespace
 415
 416 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 417                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 418                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 419 {
 420         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 421         CaptureCard *card = &cards[card_index];
 422
 423         if (is_mode_scanning[card_index]) {
 424                 if (video_format.has_signal) {
 425                         // Found a stable signal, so stop scanning.
 426                         is_mode_scanning[card_index] = false;
 427                 } else {
 428                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 429                         steady_clock::time_point now = steady_clock::now();
 430                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 431                         if (sec_since_last_switch > switch_time_s) {
 432                                 // It isn't this mode; try the next one.
 433                                 mode_scanlist_index[card_index]++;
 434                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 435                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 436                                 last_mode_scan_change[card_index] = now;
 437                         }
 438                 }
 439         }
 440
 441         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 442         assert(frame_length > 0);
 443
 444         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;
 445         if (num_samples > OUTPUT_FREQUENCY / 10) {
 446                 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",
 447                         card_index, int(audio_frame.len), int(audio_offset),
 448                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 449                 if (video_frame.owner) {
 450                         video_frame.owner->release_frame(video_frame);
 451                 }
 452                 if (audio_frame.owner) {
 453                         audio_frame.owner->release_frame(audio_frame);
 454                 }
 455                 return;
 456         }
 457
 458         int dropped_frames = 0;
 459         if (card->last_timecode != -1) {
 460                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 461         }
 462
 463         // Number of samples per frame if we need to insert silence.
 464         // (Could be nonintegral, but resampling will save us then.)
 465         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 466
 467         if (dropped_frames > MAX_FPS * 2) {
 468                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 469                         card_index, card->last_timecode, timecode);
 470                 audio_mixer.reset_resampler(device);
 471                 dropped_frames = 0;
 472         } else if (dropped_frames > 0) {
 473                 // Insert silence as needed.
 474                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 475                         card_index, dropped_frames, timecode);
 476
 477                 bool success;
 478                 do {
 479                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 480                 } while (!success);
 481         }
 482
 483         audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 484
 485         // Done with the audio, so release it.
 486         if (audio_frame.owner) {
 487                 audio_frame.owner->release_frame(audio_frame);
 488         }
 489
 490         card->last_timecode = timecode;
 491
 492         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 493         if (video_frame.len - video_offset == 0 ||
 494             video_frame.len - video_offset != expected_length) {
 495                 if (video_frame.len != 0) {
 496                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 497                                 card_index, video_frame.len - video_offset, expected_length);
 498                 }
 499                 if (video_frame.owner) {
 500                         video_frame.owner->release_frame(video_frame);
 501                 }
 502
 503                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 504                 // so that pts can go up accordingly.
 505                 {
 506                         unique_lock<mutex> lock(card_mutex);
 507                         CaptureCard::NewFrame new_frame;
 508                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 509                         new_frame.length = frame_length;
 510                         new_frame.interlaced = false;
 511                         new_frame.dropped_frames = dropped_frames;
 512                         new_frame.received_timestamp = video_frame.received_timestamp;
 513                         card->new_frames.push_back(move(new_frame));
 514                         card->new_frames_changed.notify_all();
 515                 }
 516                 return;
 517         }
 518
 519         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 520
 521         unsigned num_fields = video_format.interlaced ? 2 : 1;
 522         steady_clock::time_point frame_upload_start;
 523         bool interlaced_stride = false;
 524         if (video_format.interlaced) {
 525                 // Send the two fields along as separate frames; the other side will need to add
 526                 // a deinterlacer to actually get this right.
 527                 assert(video_format.height % 2 == 0);
 528                 video_format.height /= 2;
 529                 assert(frame_length % 2 == 0);
 530                 frame_length /= 2;
 531                 num_fields = 2;
 532                 if (video_format.second_field_start == 1) {
 533                         interlaced_stride = true;
 534                 }
 535                 frame_upload_start = steady_clock::now();
 536         }
 537         userdata->last_interlaced = video_format.interlaced;
 538         userdata->last_has_signal = video_format.has_signal;
 539         userdata->last_is_connected = video_format.is_connected;
 540         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 541         userdata->last_frame_rate_den = video_format.frame_rate_den;
 542         RefCountedFrame frame(video_frame);
 543
 544         // Upload the textures.
 545         const size_t cbcr_width = video_format.width / 2;
 546         const size_t cbcr_offset = video_offset / 2;
 547         const size_t y_offset = video_frame.size / 2 + video_offset / 2;
 548
 549         for (unsigned field = 0; field < num_fields; ++field) {
 550                 // Put the actual texture upload in a lambda that is executed in the main thread.
 551                 // It is entirely possible to do this in the same thread (and it might even be
 552                 // faster, depending on the GPU and driver), but it appears to be trickling
 553                 // driver bugs very easily.
 554                 //
 555                 // Note that this means we must hold on to the actual frame data in <userdata>
 556                 // until the upload command is run, but we hold on to <frame> much longer than that
 557                 // (in fact, all the way until we no longer use the texture in rendering).
 558                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
 559                         unsigned field_start_line;
 560                         if (field == 1) {
 561                                 field_start_line = video_format.second_field_start;
 562                         } else {
 563                                 field_start_line = video_format.extra_lines_top;
 564                         }
 565
 566                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height);
 567
 568                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 569                         check_error();
 570
 571                         if (global_flags.ten_bit_input) {
 572                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 573                                 upload_texture(userdata->tex_v210[field], video_format.stride / sizeof(uint32_t), video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, field_start);
 574                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 575                         } else {
 576                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 577                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 578
 579                                 // Make up our own strides, since we are interleaving.
 580                                 upload_texture(userdata->tex_y[field], video_format.width, video_format.height, video_format.width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_y_start);
 581                                 upload_texture(userdata->tex_cbcr[field], cbcr_width, video_format.height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
 582                         }
 583
 584                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 585                         check_error();
 586                 };
 587
 588                 if (field == 1) {
 589                         // Don't upload the second field as fast as we can; wait until
 590                         // the field time has approximately passed. (Otherwise, we could
 591                         // get timing jitter against the other sources, and possibly also
 592                         // against the video display, although the latter is not as critical.)
 593                         // This requires our system clock to be reasonably close to the
 594                         // video clock, but that's not an unreasonable assumption.
 595                         steady_clock::time_point second_field_start = frame_upload_start +
 596                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 597                         this_thread::sleep_until(second_field_start);
 598                 }
 599
 600                 {
 601                         unique_lock<mutex> lock(card_mutex);
 602                         CaptureCard::NewFrame new_frame;
 603                         new_frame.frame = frame;
 604                         new_frame.length = frame_length;
 605                         new_frame.field = field;
 606                         new_frame.interlaced = video_format.interlaced;
 607                         new_frame.upload_func = upload_func;
 608                         new_frame.dropped_frames = dropped_frames;
 609                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 610                         card->new_frames.push_back(move(new_frame));
 611                         card->new_frames_changed.notify_all();
 612                 }
 613         }
 614 }
 615
 616 void Mixer::bm_hotplug_add(libusb_device *dev)
 617 {
 618         lock_guard<mutex> lock(hotplug_mutex);
 619         hotplugged_cards.push_back(dev);
 620 }
 621
 622 void Mixer::bm_hotplug_remove(unsigned card_index)
 623 {
 624         cards[card_index].new_frames_changed.notify_all();
 625 }
 626
 627 void Mixer::thread_func()
 628 {
 629         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 630
 631         eglBindAPI(EGL_OPENGL_API);
 632         QOpenGLContext *context = create_context(mixer_surface);
 633         if (!make_current(context, mixer_surface)) {
 634                 printf("oops\n");
 635                 exit(1);
 636         }
 637
 638         // Start the actual capture. (We don't want to do it before we're actually ready
 639         // to process output frames.)
 640         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 641                 if (int(card_index) != output_card_index) {
 642                         cards[card_index].capture->start_bm_capture();
 643                 }
 644         }
 645
 646         steady_clock::time_point start, now;
 647         start = steady_clock::now();
 648
 649         int stats_dropped_frames = 0;
 650
 651         while (!should_quit) {
 652                 if (desired_output_card_index != output_card_index) {
 653                         set_output_card_internal(desired_output_card_index);
 654                 }
 655                 if (output_card_index != -1 &&
 656                     desired_output_video_mode != output_video_mode) {
 657                         DeckLinkOutput *output = cards[output_card_index].output.get();
 658                         output->end_output();
 659                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 660                         output->start_output(desired_output_video_mode, pts_int);
 661                 }
 662
 663                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 664                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 665
 666                 bool master_card_is_output;
 667                 unsigned master_card_index;
 668                 if (output_card_index != -1) {
 669                         master_card_is_output = true;
 670                         master_card_index = output_card_index;
 671                 } else {
 672                         master_card_is_output = false;
 673                         master_card_index = theme->map_signal(master_clock_channel);
 674                         assert(master_card_index < num_cards);
 675                 }
 676
 677                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
 678                 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);
 679                 stats_dropped_frames += output_frame_info.dropped_frames;
 680
 681                 handle_hotplugged_cards();
 682
 683                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 684                         if (card_index == master_card_index || !has_new_frame[card_index]) {
 685                                 continue;
 686                         }
 687                         if (new_frames[card_index].frame->len == 0) {
 688                                 ++new_frames[card_index].dropped_frames;
 689                         }
 690                         if (new_frames[card_index].dropped_frames > 0) {
 691                                 printf("Card %u dropped %d frames before this\n",
 692                                         card_index, int(new_frames[card_index].dropped_frames));
 693                         }
 694                 }
 695
 696                 // If the first card is reporting a corrupted or otherwise dropped frame,
 697                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 698                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
 699                         ++stats_dropped_frames;
 700                         pts_int += new_frames[master_card_index].length;
 701                         continue;
 702                 }
 703
 704                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 705                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
 706                                 continue;
 707
 708                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
 709                         assert(new_frame->frame != nullptr);
 710                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
 711                         check_error();
 712
 713                         // The new texture might need uploading before use.
 714                         if (new_frame->upload_func) {
 715                                 new_frame->upload_func();
 716                                 new_frame->upload_func = nullptr;
 717                         }
 718                 }
 719
 720                 int64_t frame_duration = output_frame_info.frame_duration;
 721                 render_one_frame(frame_duration);
 722                 ++frame_num;
 723                 pts_int += frame_duration;
 724
 725                 now = steady_clock::now();
 726                 double elapsed = duration<double>(now - start).count();
 727                 if (frame_num % 100 == 0) {
 728                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
 729                                 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
 730                                 1e3 * elapsed / frame_num);
 731                 //      chain->print_phase_timing();
 732
 733                         // Check our memory usage, to see if we are close to our mlockall()
 734                         // limit (if at all set).
 735                         rusage used;
 736                         if (getrusage(RUSAGE_SELF, &used) == -1) {
 737                                 perror("getrusage(RUSAGE_SELF)");
 738                                 assert(false);
 739                         }
 740
 741                         if (uses_mlock) {
 742                                 rlimit limit;
 743                                 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
 744                                         perror("getrlimit(RLIMIT_MEMLOCK)");
 745                                         assert(false);
 746                                 }
 747
 748                                 if (limit.rlim_cur == 0) {
 749                                         printf(", using %ld MB memory (locked)",
 750                                                 long(used.ru_maxrss / 1024));
 751                                 } else {
 752                                         printf(", using %ld / %ld MB lockable memory (%.1f%%)",
 753                                                 long(used.ru_maxrss / 1024),
 754                                                 long(limit.rlim_cur / 1048576),
 755                                                 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
 756                                 }
 757                         } else {
 758                                 printf(", using %ld MB memory (not locked)",
 759                                         long(used.ru_maxrss / 1024));
 760                         }
 761
 762                         printf("\n");
 763                 }
 764
 765
 766                 if (should_cut.exchange(false)) {  // Test and clear.
 767                         video_encoder->do_cut(frame_num);
 768                 }
 769
 770 #if 0
 771                 // Reset every 100 frames, so that local variations in frame times
 772                 // (especially for the first few frames, when the shaders are
 773                 // compiled etc.) don't make it hard to measure for the entire
 774                 // remaining duration of the program.
 775                 if (frame == 10000) {
 776                         frame = 0;
 777                         start = now;
 778                 }
 779 #endif
 780                 check_error();
 781         }
 782
 783         resource_pool->clean_context();
 784 }
 785
 786 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
 787 {
 788         if (output_card_index != -1) {
 789                 // The output card (ie., cards[output_card_index].output) is the master clock,
 790                 // so no input card (ie., cards[card_index].capture) is.
 791                 return false;
 792         }
 793         return (card_index == master_card_index);
 794 }
 795
 796 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
 797 {
 798         // Count the number of frames in the queue, including any frames
 799         // we dropped. It's hard to know exactly how we should deal with
 800         // dropped (corrupted) input frames; they don't help our goal of
 801         // avoiding starvation, but they still add to the problem of latency.
 802         // Since dropped frames is going to mean a bump in the signal anyway,
 803         // we err on the side of having more stable latency instead.
 804         unsigned queue_length = 0;
 805         for (const CaptureCard::NewFrame &frame : card->new_frames) {
 806                 queue_length += frame.dropped_frames + 1;
 807         }
 808         card->queue_length_policy.update_policy(queue_length);
 809
 810         // If needed, drop frames until the queue is below the safe limit.
 811         // We prefer to drop from the head, because all else being equal,
 812         // we'd like more recent frames (less latency).
 813         unsigned dropped_frames = 0;
 814         while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
 815                 assert(!card->new_frames.empty());
 816                 assert(queue_length > card->new_frames.front().dropped_frames);
 817                 queue_length -= card->new_frames.front().dropped_frames;
 818
 819                 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
 820                         // No need to drop anything.
 821                         break;
 822                 }
 823
 824                 card->new_frames.pop_front();
 825                 card->new_frames_changed.notify_all();
 826                 --queue_length;
 827                 ++dropped_frames;
 828         }
 829
 830         if (dropped_frames > 0) {
 831                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
 832                         card_index, dropped_frames);
 833         }
 834 }
 835
 836
 837 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])
 838 {
 839         OutputFrameInfo output_frame_info;
 840 start:
 841         unique_lock<mutex> lock(card_mutex, defer_lock);
 842         if (master_card_is_output) {
 843                 // Clocked to the output, so wait for it to be ready for the next frame.
 844                 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);
 845                 lock.lock();
 846         } else {
 847                 // Wait for the master card to have a new frame.
 848                 // TODO: Add a timeout.
 849                 output_frame_info.is_preroll = false;
 850                 lock.lock();
 851                 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(); });
 852         }
 853
 854         if (master_card_is_output) {
 855                 handle_hotplugged_cards();
 856         } else if (cards[master_card_index].new_frames.empty()) {
 857                 // We were woken up, but not due to a new frame. Deal with it
 858                 // and then restart.
 859                 assert(cards[master_card_index].capture->get_disconnected());
 860                 handle_hotplugged_cards();
 861                 goto start;
 862         }
 863
 864         if (!master_card_is_output) {
 865                 output_frame_info.frame_timestamp =
 866                         cards[master_card_index].new_frames.front().received_timestamp;
 867         }
 868
 869         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 870                 CaptureCard *card = &cards[card_index];
 871                 if (input_card_is_master_clock(card_index, master_card_index)) {
 872                         // We don't use the queue length policy for the master card,
 873                         // but we will if it stops being the master. Thus, clear out
 874                         // the policy in case we switch in the future.
 875                         card->queue_length_policy.reset(card_index);
 876                         assert(!card->new_frames.empty());
 877                 } else {
 878                         trim_queue(card, card_index);
 879                 }
 880                 if (!card->new_frames.empty()) {
 881                         new_frames[card_index] = move(card->new_frames.front());
 882                         has_new_frame[card_index] = true;
 883                         card->new_frames.pop_front();
 884                         card->new_frames_changed.notify_all();
 885                 }
 886         }
 887
 888         if (!master_card_is_output) {
 889                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
 890                 output_frame_info.frame_duration = new_frames[master_card_index].length;
 891         }
 892
 893         // This might get off by a fractional sample when changing master card
 894         // between ones with different frame rates, but that's fine.
 895         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
 896         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
 897         fractional_samples = num_samples_times_timebase % TIMEBASE;
 898         assert(output_frame_info.num_samples >= 0);
 899
 900         return output_frame_info;
 901 }
 902
 903 void Mixer::handle_hotplugged_cards()
 904 {
 905         // Check for cards that have been disconnected since last frame.
 906         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 907                 CaptureCard *card = &cards[card_index];
 908                 if (card->capture->get_disconnected()) {
 909                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
 910                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 911                         configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
 912                         card->queue_length_policy.reset(card_index);
 913                         card->capture->start_bm_capture();
 914                 }
 915         }
 916
 917         // Check for cards that have been connected since last frame.
 918         vector<libusb_device *> hotplugged_cards_copy;
 919         {
 920                 lock_guard<mutex> lock(hotplug_mutex);
 921                 swap(hotplugged_cards, hotplugged_cards_copy);
 922         }
 923         for (libusb_device *new_dev : hotplugged_cards_copy) {
 924                 // Look for a fake capture card where we can stick this in.
 925                 int free_card_index = -1;
 926                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 927                         if (cards[card_index].is_fake_capture) {
 928                                 free_card_index = card_index;
 929                                 break;
 930                         }
 931                 }
 932
 933                 if (free_card_index == -1) {
 934                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
 935                         libusb_unref_device(new_dev);
 936                 } else {
 937                         // BMUSBCapture takes ownership.
 938                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
 939                         CaptureCard *card = &cards[free_card_index];
 940                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
 941                         configure_card(free_card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
 942                         card->queue_length_policy.reset(free_card_index);
 943                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
 944                         capture->start_bm_capture();
 945                 }
 946         }
 947 }
 948
 949
 950 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)
 951 {
 952         // Resample the audio as needed, including from previously dropped frames.
 953         assert(num_cards > 0);
 954         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
 955                 const bool dropped_frame = (frame_num != dropped_frames);
 956                 {
 957                         // Signal to the audio thread to process this frame.
 958                         // Note that if the frame is a dropped frame, we signal that
 959                         // we don't want to use this frame as base for adjusting
 960                         // the resampler rate. The reason for this is that the timing
 961                         // of these frames is often way too late; they typically don't
 962                         // “arrive” before we synthesize them. Thus, we could end up
 963                         // in a situation where we have inserted e.g. five audio frames
 964                         // into the queue before we then start pulling five of them
 965                         // back out. This makes ResamplingQueue overestimate the delay,
 966                         // causing undue resampler changes. (We _do_ use the last,
 967                         // non-dropped frame; perhaps we should just discard that as well,
 968                         // since dropped frames are expected to be rare, and it might be
 969                         // better to just wait until we have a slightly more normal situation).
 970                         unique_lock<mutex> lock(audio_mutex);
 971                         bool adjust_rate = !dropped_frame && !is_preroll;
 972                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
 973                         audio_task_queue_changed.notify_one();
 974                 }
 975                 if (dropped_frame) {
 976                         // For dropped frames, increase the pts. Note that if the format changed
 977                         // in the meantime, we have no way of detecting that; we just have to
 978                         // assume the frame length is always the same.
 979                         pts_int += length_per_frame;
 980                 }
 981         }
 982 }
 983
 984 void Mixer::render_one_frame(int64_t duration)
 985 {
 986         // Determine the time code for this frame before we start rendering.
 987         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
 988         if (display_timecode_on_stdout) {
 989                 printf("Timecode: '%s'\n", timecode_text.c_str());
 990         }
 991
 992         // Get the main chain from the theme, and set its state immediately.
 993         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
 994         EffectChain *chain = theme_main_chain.chain;
 995         theme_main_chain.setup_chain();
 996         //theme_main_chain.chain->enable_phase_timing(true);
 997
 998         GLuint y_tex, cbcr_tex;
 999         bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
1000         assert(got_frame);
1001
1002         // Render main chain.
1003         GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, global_flags.width, global_flags.height);
1004         GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, global_flags.width, global_flags.height);  // Saves texture bandwidth, although dithering gets messed up.
1005         GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
1006         check_error();
1007         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1008
1009         if (display_timecode_in_stream) {
1010                 // Render the timecode on top.
1011                 timecode_renderer->render_timecode(fbo, timecode_text);
1012         }
1013
1014         resource_pool->release_fbo(fbo);
1015
1016         chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1017         if (output_card_index != -1) {
1018                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, theme_main_chain.input_frames, pts_int, duration);
1019         }
1020         resource_pool->release_2d_texture(cbcr_full_tex);
1021
1022         // Set the right state for rgba_tex.
1023         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1024         glBindTexture(GL_TEXTURE_2D, rgba_tex);
1025         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1026         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1027         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1028
1029         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1030         RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
1031
1032         // The live frame just shows the RGBA texture we just rendered.
1033         // It owns rgba_tex now.
1034         DisplayFrame live_frame;
1035         live_frame.chain = display_chain.get();
1036         live_frame.setup_chain = [this, rgba_tex]{
1037                 display_input->set_texture_num(rgba_tex);
1038         };
1039         live_frame.ready_fence = fence;
1040         live_frame.input_frames = {};
1041         live_frame.temp_textures = { rgba_tex };
1042         output_channel[OUTPUT_LIVE].output_frame(live_frame);
1043
1044         // Set up preview and any additional channels.
1045         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1046                 DisplayFrame display_frame;
1047                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1048                 display_frame.chain = chain.chain;
1049                 display_frame.setup_chain = chain.setup_chain;
1050                 display_frame.ready_fence = fence;
1051                 display_frame.input_frames = chain.input_frames;
1052                 display_frame.temp_textures = {};
1053                 output_channel[i].output_frame(display_frame);
1054         }
1055 }
1056
1057 void Mixer::audio_thread_func()
1058 {
1059         pthread_setname_np(pthread_self(), "Mixer_Audio");
1060
1061         while (!should_quit) {
1062                 AudioTask task;
1063
1064                 {
1065                         unique_lock<mutex> lock(audio_mutex);
1066                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1067                         if (should_quit) {
1068                                 return;
1069                         }
1070                         task = audio_task_queue.front();
1071                         audio_task_queue.pop();
1072                 }
1073
1074                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1075                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1076                 vector<float> samples_out = audio_mixer.get_output(
1077                         task.frame_timestamp,
1078                         task.num_samples,
1079                         rate_adjustment_policy);
1080
1081                 // Send the samples to the sound card, then add them to the output.
1082                 if (alsa) {
1083                         alsa->write(samples_out);
1084                 }
1085                 if (output_card_index != -1) {
1086                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1087                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1088                 }
1089                 video_encoder->add_audio(task.pts_int, move(samples_out));
1090         }
1091 }
1092
1093 void Mixer::release_display_frame(DisplayFrame *frame)
1094 {
1095         for (GLuint texnum : frame->temp_textures) {
1096                 resource_pool->release_2d_texture(texnum);
1097         }
1098         frame->temp_textures.clear();
1099         frame->ready_fence.reset();
1100         frame->input_frames.clear();
1101 }
1102
1103 void Mixer::start()
1104 {
1105         mixer_thread = thread(&Mixer::thread_func, this);
1106         audio_thread = thread(&Mixer::audio_thread_func, this);
1107 }
1108
1109 void Mixer::quit()
1110 {
1111         should_quit = true;
1112         audio_task_queue_changed.notify_one();
1113         mixer_thread.join();
1114         audio_thread.join();
1115 }
1116
1117 void Mixer::transition_clicked(int transition_num)
1118 {
1119         theme->transition_clicked(transition_num, pts());
1120 }
1121
1122 void Mixer::channel_clicked(int preview_num)
1123 {
1124         theme->channel_clicked(preview_num);
1125 }
1126
1127 void Mixer::start_mode_scanning(unsigned card_index)
1128 {
1129         assert(card_index < num_cards);
1130         if (is_mode_scanning[card_index]) {
1131                 return;
1132         }
1133         is_mode_scanning[card_index] = true;
1134         mode_scanlist[card_index].clear();
1135         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1136                 mode_scanlist[card_index].push_back(mode.first);
1137         }
1138         assert(!mode_scanlist[card_index].empty());
1139         mode_scanlist_index[card_index] = 0;
1140         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1141         last_mode_scan_change[card_index] = steady_clock::now();
1142 }
1143
1144 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1145 {
1146         assert(desired_output_card_index != -1);
1147         unique_lock<mutex> lock(card_mutex);
1148         return cards[desired_output_card_index].output->get_available_video_modes();
1149 }
1150
1151 Mixer::OutputChannel::~OutputChannel()
1152 {
1153         if (has_current_frame) {
1154                 parent->release_display_frame(&current_frame);
1155         }
1156         if (has_ready_frame) {
1157                 parent->release_display_frame(&ready_frame);
1158         }
1159 }
1160
1161 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1162 {
1163         // Store this frame for display. Remove the ready frame if any
1164         // (it was seemingly never used).
1165         {
1166                 unique_lock<mutex> lock(frame_mutex);
1167                 if (has_ready_frame) {
1168                         parent->release_display_frame(&ready_frame);
1169                 }
1170                 ready_frame = frame;
1171                 has_ready_frame = true;
1172         }
1173
1174         if (new_frame_ready_callback) {
1175                 new_frame_ready_callback();
1176         }
1177
1178         // Reduce the number of callbacks by filtering duplicates. The reason
1179         // why we bother doing this is that Qt seemingly can get into a state
1180         // where its builds up an essentially unbounded queue of signals,
1181         // consuming more and more memory, and there's no good way of collapsing
1182         // user-defined signals or limiting the length of the queue.
1183         if (transition_names_updated_callback) {
1184                 vector<string> transition_names = global_mixer->get_transition_names();
1185                 bool changed = false;
1186                 if (transition_names.size() != last_transition_names.size()) {
1187                         changed = true;
1188                 } else {
1189                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1190                                 if (transition_names[i] != last_transition_names[i]) {
1191                                         changed = true;
1192                                         break;
1193                                 }
1194                         }
1195                 }
1196                 if (changed) {
1197                         transition_names_updated_callback(transition_names);
1198                         last_transition_names = transition_names;
1199                 }
1200         }
1201         if (name_updated_callback) {
1202                 string name = global_mixer->get_channel_name(channel);
1203                 if (name != last_name) {
1204                         name_updated_callback(name);
1205                         last_name = name;
1206                 }
1207         }
1208         if (color_updated_callback) {
1209                 string color = global_mixer->get_channel_color(channel);
1210                 if (color != last_color) {
1211                         color_updated_callback(color);
1212                         last_color = color;
1213                 }
1214         }
1215 }
1216
1217 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1218 {
1219         unique_lock<mutex> lock(frame_mutex);
1220         if (!has_current_frame && !has_ready_frame) {
1221                 return false;
1222         }
1223
1224         if (has_current_frame && has_ready_frame) {
1225                 // We have a new ready frame. Toss the current one.
1226                 parent->release_display_frame(&current_frame);
1227                 has_current_frame = false;
1228         }
1229         if (has_ready_frame) {
1230                 assert(!has_current_frame);
1231                 current_frame = ready_frame;
1232                 ready_frame.ready_fence.reset();  // Drop the refcount.
1233                 ready_frame.input_frames.clear();  // Drop the refcounts.
1234                 has_current_frame = true;
1235                 has_ready_frame = false;
1236         }
1237
1238         *frame = current_frame;
1239         return true;
1240 }
1241
1242 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1243 {
1244         new_frame_ready_callback = callback;
1245 }
1246
1247 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1248 {
1249         transition_names_updated_callback = callback;
1250 }
1251
1252 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1253 {
1254         name_updated_callback = callback;
1255 }
1256
1257 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1258 {
1259         color_updated_callback = callback;
1260 }
1261
1262 mutex RefCountedGLsync::fence_lock;