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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect.h>
   8 #include <movit/effect_chain.h>
   9 #include <movit/effect_util.h>
  10 #include <movit/flat_input.h>
  11 #include <movit/image_format.h>
  12 #include <movit/init.h>
  13 #include <movit/resource_pool.h>
  14 #include <pthread.h>
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <stdlib.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 "basic_stats.h"
  35 #include "bmusb/bmusb.h"
  36 #include "bmusb/fake_capture.h"
  37 #ifdef HAVE_CEF
  38 #include "cef_capture.h"
  39 #endif
  40 #include "chroma_subsampler.h"
  41 #include "shared/context.h"
  42 #include "decklink_capture.h"
  43 #include "decklink_output.h"
  44 #include "decklink_util.h"
  45 #include "defs.h"
  46 #include "shared/disk_space_estimator.h"
  47 #include "ffmpeg_capture.h"
  48 #include "flags.h"
  49 #include "image_input.h"
  50 #include "input_mapping.h"
  51 #include "shared/metrics.h"
  52 #include "shared/va_display.h"
  53 #include "mjpeg_encoder.h"
  54 #include "pbo_frame_allocator.h"
  55 #include "shared/ref_counted_gl_sync.h"
  56 #include "resampling_queue.h"
  57 #include "shared/timebase.h"
  58 #include "timecode_renderer.h"
  59 #include "v210_converter.h"
  60 #include "video_encoder.h"
  61
  62 #undef Status
  63 #include <google/protobuf/util/json_util.h>
  64 #include "json.pb.h"
  65
  66 #ifdef HAVE_SRT
  67 // Must come after CEF, since it includes <syslog.h>, which has #defines
  68 // that conflict with CEF logging constants.
  69 #include <srt/srt.h>
  70 #endif
  71
  72 class IDeckLink;
  73 class QOpenGLContext;
  74
  75 using namespace movit;
  76 using namespace std;
  77 using namespace std::chrono;
  78 using namespace std::placeholders;
  79 using namespace bmusb;
  80
  81 Mixer *global_mixer = nullptr;
  82
  83 namespace {
  84
  85 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  86 {
  87         if (interlaced) {
  88                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  89                         input_state->buffered_frames[card_index][frame_num] =
  90                                 input_state->buffered_frames[card_index][frame_num - 1];
  91                 }
  92                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  93         } else {
  94                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  95                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  96                 }
  97         }
  98 }
  99
 100 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
 101 {
 102         bool first;
 103         switch (userdata->pixel_format) {
 104         case PixelFormat_10BitYCbCr:
 105                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
 106                 break;
 107         case PixelFormat_8BitYCbCr:
 108                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
 109                 break;
 110         case PixelFormat_8BitBGRA:
 111                 first = userdata->tex_rgba[field] == 0;
 112                 break;
 113         case PixelFormat_8BitYCbCrPlanar:
 114                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 115                 break;
 116         default:
 117                 assert(false);
 118         }
 119
 120         const bool recreate_main_texture =
 121                 first ||
 122                 width != userdata->last_width[field] ||
 123                 height != userdata->last_height[field] ||
 124                 cbcr_width != userdata->last_cbcr_width[field] ||
 125                 cbcr_height != userdata->last_cbcr_height[field];
 126         const bool recreate_v210_texture =
 127                 global_flags.bit_depth > 8 &&
 128                 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
 129
 130         if (recreate_main_texture) {
 131                 // We changed resolution since last use of this texture, so we need to create
 132                 // a new object. Note that this each card has its own PBOFrameAllocator,
 133                 // we don't need to worry about these flip-flopping between resolutions.
 134                 switch (userdata->pixel_format) {
 135                 case PixelFormat_10BitYCbCr:
 136                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 137                         check_error();
 138                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 139                         check_error();
 140                         break;
 141                 case PixelFormat_8BitYCbCr: {
 142                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 143                         check_error();
 144                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 145                         check_error();
 146                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 147                         check_error();
 148                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 149                         check_error();
 150                         break;
 151                 }
 152                 case PixelFormat_8BitYCbCrPlanar: {
 153                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 154                         check_error();
 155                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 156                         check_error();
 157                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 158                         check_error();
 159                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 160                         check_error();
 161                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 162                         check_error();
 163                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 164                         check_error();
 165                         break;
 166                 }
 167                 case PixelFormat_8BitBGRA:
 168                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 169                         check_error();
 170                         // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
 171                         glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 172                         check_error();
 173                         break;
 174                 default:
 175                         assert(false);
 176                 }
 177                 userdata->last_width[field] = width;
 178                 userdata->last_height[field] = height;
 179                 userdata->last_cbcr_width[field] = cbcr_width;
 180                 userdata->last_cbcr_height[field] = cbcr_height;
 181         }
 182         if (recreate_v210_texture) {
 183                 // Same as above; we need to recreate the texture.
 184                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 185                 check_error();
 186                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 187                 check_error();
 188                 userdata->last_v210_width[field] = v210_width;
 189                 userdata->last_height[field] = height;
 190         }
 191 }
 192
 193 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 194 {
 195         if (interlaced_stride) {
 196                 stride *= 2;
 197         }
 198         if (global_flags.flush_pbos) {
 199                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 200                 check_error();
 201         }
 202
 203         glBindTexture(GL_TEXTURE_2D, tex);
 204         check_error();
 205         if (interlaced_stride) {
 206                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 207                 check_error();
 208         } else {
 209                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 210                 check_error();
 211         }
 212
 213         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 214         check_error();
 215         glBindTexture(GL_TEXTURE_2D, 0);
 216         check_error();
 217         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 218         check_error();
 219 }
 220
 221 }  // namespace
 222
 223 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 224 {
 225         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 226         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 227 }
 228
 229 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 230 {
 231         global_metrics.remove("input_underestimated_jitter_frames", labels);
 232         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 233 }
 234
 235 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 236 {
 237         if (frame_duration != last_duration) {
 238                 // If the frame rate changed, the input clock is also going to change,
 239                 // so our historical data doesn't make much sense anymore.
 240                 // Also, format changes typically introduce blips that are not representative
 241                 // of the typical frame stream. (We make the assumption that format changes
 242                 // don't happen all the time in regular use; if they did, we should probably
 243                 // rather keep the history so that we take jitter they may introduce into account.)
 244                 clear();
 245                 last_duration = frame_duration;
 246         }
 247         if (expected_timestamp > steady_clock::time_point::min()) {
 248                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 249                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 250                 history.push_back(orders.insert(jitter_seconds));
 251                 if (jitter_seconds > estimate_max_jitter()) {
 252                         ++metric_input_underestimated_jitter_frames;
 253                 }
 254
 255                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 256
 257                 if (history.size() > history_length) {
 258                         orders.erase(history.front());
 259                         history.pop_front();
 260                 }
 261                 assert(history.size() <= history_length);
 262         }
 263         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 264 }
 265
 266 double JitterHistory::estimate_max_jitter() const
 267 {
 268         if (orders.empty()) {
 269                 return 0.0;
 270         }
 271         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 272         if (percentile <= 0.5) {
 273                 return *next(orders.begin(), elem_idx) * multiplier;
 274         } else {
 275                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 276         }
 277 }
 278
 279 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 280 {
 281         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 282 }
 283
 284 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 285 {
 286         global_metrics.remove("input_queue_safe_length_frames", labels);
 287 }
 288
 289 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 290                                       steady_clock::time_point expected_next_input_frame,
 291                                       int64_t input_frame_duration,
 292                                       int64_t master_frame_duration,
 293                                       double max_input_card_jitter_seconds,
 294                                       double max_master_card_jitter_seconds)
 295 {
 296         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 297         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 298
 299         // Figure out when we can expect the next frame for this card, assuming
 300         // worst-case jitter (ie., the frame is maximally late).
 301         double seconds_until_next_frame = max(duration<double>(expected_next_input_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 302
 303         // How many times are the master card expected to tick in that time?
 304         // We assume the master clock has worst-case jitter but not any rate
 305         // discrepancy, ie., it ticks as early as possible every time, but not
 306         // cumulatively.
 307         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 308
 309         // As a special case, if the master card ticks faster than the input card,
 310         // we expect the queue to drain by itself even without dropping. But if
 311         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 312         // go slowly enough that the effect wouldn't really be appreciable.
 313         // We account for this by looking at the situation five frames ahead,
 314         // assuming everything else is the same.
 315         double frames_allowed;
 316         if (master_frame_duration < input_frame_duration) {
 317                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 318         } else {
 319                 frames_allowed = frames_needed;
 320         }
 321
 322         safe_queue_length = max<int>(floor(frames_allowed), 0);
 323         metric_input_queue_safe_length_frames = safe_queue_length;
 324 }
 325
 326 Mixer::Mixer(const QSurfaceFormat &format)
 327         : httpd(),
 328           mixer_surface(create_surface(format)),
 329           h264_encoder_surface(create_surface(format)),
 330           decklink_output_surface(create_surface(format)),
 331           image_update_surface(create_surface(format))
 332 {
 333         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 334         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 335         check_error();
 336
 337         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 338             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 339                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 340                 exit(1);
 341         }
 342
 343         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 344         // will be halved when sampling them, and we need to compensate here.
 345         movit_texel_subpixel_precision /= 2.0;
 346
 347         resource_pool.reset(new ResourcePool);
 348         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 349                 output_channel[i].parent = this;
 350                 output_channel[i].channel = i;
 351         }
 352
 353         ImageFormat inout_format;
 354         inout_format.color_space = COLORSPACE_sRGB;
 355         inout_format.gamma_curve = GAMMA_sRGB;
 356
 357         // Matches the 4:2:0 format created by the main chain.
 358         YCbCrFormat ycbcr_format;
 359         ycbcr_format.chroma_subsampling_x = 2;
 360         ycbcr_format.chroma_subsampling_y = 2;
 361         if (global_flags.ycbcr_rec709_coefficients) {
 362                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 363         } else {
 364                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 365         }
 366         ycbcr_format.full_range = false;
 367         ycbcr_format.num_levels = 1 << global_flags.bit_depth;
 368         ycbcr_format.cb_x_position = 0.0f;
 369         ycbcr_format.cr_x_position = 0.0f;
 370         ycbcr_format.cb_y_position = 0.5f;
 371         ycbcr_format.cr_y_position = 0.5f;
 372
 373         // Initialize the neutral colors to sane values.
 374         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 375                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 376         }
 377
 378         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 379         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 380         check_error();
 381         GLenum type = global_flags.bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 382         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 383         display_chain->add_input(display_input);
 384         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 385         display_chain->set_dither_bits(0);  // Don't bother.
 386         display_chain->finalize();
 387
 388         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));
 389         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 390                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 391         }
 392
 393         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 394         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
 395
 396         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 397         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 398         audio_mixer.reset(new AudioMixer);
 399
 400         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 401         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 402                 char url[256];
 403                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 404                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 405         }
 406
 407         // Start listening for clients only once VideoEncoder has written its header, if any.
 408         httpd.start(global_flags.http_port);
 409
 410         // First try initializing the then PCI devices, then USB, then
 411         // fill up with fake cards until we have the desired number of cards.
 412         unsigned num_pci_devices = 0;
 413         unsigned card_index = 0;
 414
 415         {
 416                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 417                 if (decklink_iterator != nullptr) {
 418                         for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
 419                                 IDeckLink *decklink;
 420                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 421                                         break;
 422                                 }
 423
 424                                 if (!decklink_card_is_active(decklink, card_index)) {
 425                                         fprintf(stderr, "DeckLink card %u is inactive in current profile, skipping (try changing it in Desktop Video Setup)\n", card_index);
 426                                         decklink->Release();
 427                                         continue;
 428                                 }
 429
 430                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 431                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 432                                 if (!output->set_device(decklink, capture->get_input())) {
 433                                         delete output;
 434                                         output = nullptr;
 435                                 }
 436                                 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
 437                                 ++num_pci_devices;
 438                         }
 439                         decklink_iterator->Release();
 440                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 441                 } else {
 442                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 443                 }
 444         }
 445
 446         unsigned num_usb_devices = BMUSBCapture::num_cards();
 447         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < unsigned(global_flags.max_num_cards); ++usb_card_index, ++card_index) {
 448                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 449                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 450                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
 451         }
 452         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 453
 454         // Fill up with fake cards for as long as we can, so that the FFmpeg
 455         // and HTML cards always come last.
 456         unsigned num_fake_cards = 0;
 457 #ifdef HAVE_CEF
 458         size_t num_html_inputs = theme->get_html_inputs().size();
 459 #else
 460         size_t num_html_inputs = 0;
 461 #endif
 462         for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
 463                 // Only bother to activate fake capture cards to satisfy the minimum.
 464                 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
 465                 if (is_active) {
 466                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 467                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 468                         ++num_fake_cards;
 469                 } else {
 470                         configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 471                 }
 472         }
 473
 474         if (num_fake_cards > 0) {
 475                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 476         }
 477
 478         // Initialize all video inputs the theme asked for.
 479         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 480                 if (card_index >= MAX_VIDEO_CARDS) {
 481                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 482                         abort();
 483                 }
 484                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 485                 video_inputs[video_card_index]->set_card_index(card_index);
 486         }
 487         num_video_inputs = video_inputs.size();
 488
 489 #ifdef HAVE_CEF
 490         // Same, for HTML inputs.
 491         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 492         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 493                 if (card_index >= MAX_VIDEO_CARDS) {
 494                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 495                         abort();
 496                 }
 497                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 498                 html_inputs[html_card_index]->set_card_index(card_index);
 499         }
 500         num_html_inputs = html_inputs.size();
 501 #endif
 502
 503         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 504         BMUSBCapture::start_bm_thread();
 505
 506 #ifdef HAVE_SRT
 507         if (global_flags.srt_port >= 0) {
 508                 start_srt();
 509         }
 510 #endif
 511
 512         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 513
 514         if (global_flags.bit_depth > 8) {
 515                 if (!v210Converter::has_hardware_support()) {
 516                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 517                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 518                         abort();
 519                 }
 520                 v210_converter.reset(new v210Converter());
 521
 522                 // These are all the widths listed in the Blackmagic SDK documentation
 523                 // (section 2.7.3, “Display Modes”).
 524                 v210_converter->precompile_shader(720);
 525                 v210_converter->precompile_shader(1280);
 526                 v210_converter->precompile_shader(1920);
 527                 v210_converter->precompile_shader(2048);
 528                 v210_converter->precompile_shader(3840);
 529                 v210_converter->precompile_shader(4096);
 530         }
 531         if (global_flags.bit_depth > 8) {
 532                 if (!v210Converter::has_hardware_support()) {
 533                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 534                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 535                         abort();
 536                 }
 537         }
 538
 539         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 540         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 541         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 542
 543         if (global_flags.enable_alsa_output) {
 544                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 545         }
 546         output_card_is_master = global_flags.output_card_is_master;
 547         if (global_flags.output_card != -1) {
 548                 desired_output_card_index = global_flags.output_card;
 549                 set_output_card_internal(global_flags.output_card);
 550         }
 551
 552         output_jitter_history.register_metrics({{ "card", "output" }});
 553
 554         ImageInput::start_update_thread(image_update_surface);
 555 }
 556
 557 Mixer::~Mixer()
 558 {
 559         ImageInput::end_update_thread();
 560
 561         if (mjpeg_encoder != nullptr) {
 562                 mjpeg_encoder->stop();
 563         }
 564         httpd.stop();
 565         BMUSBCapture::stop_bm_thread();
 566
 567         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 568                 if (cards[card_index].capture != nullptr) {  // Active.
 569                         cards[card_index].capture->stop_dequeue_thread();
 570                 }
 571                 if (cards[card_index].output) {
 572                         cards[card_index].output->end_output();
 573                         cards[card_index].output.reset();
 574                 }
 575         }
 576
 577         video_encoder.reset(nullptr);
 578 }
 579
 580 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 581 {
 582         bool is_active = capture != nullptr;
 583         if (is_active) {
 584                 printf("Configuring card %d...\n", card_index);
 585         } else {
 586                 assert(card_type == CardType::FAKE_CAPTURE);
 587         }
 588
 589         CaptureCard *card = &cards[card_index];
 590         if (card->capture != nullptr) {
 591                 card_mutex.unlock();  // The dequeue thread could be waiting for bm_frame().
 592                 card->capture->stop_dequeue_thread();
 593                 card_mutex.lock();
 594         }
 595         card->capture.reset(capture);
 596         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 597         if (card->is_fake_capture) {
 598                 card->fake_capture_counter = fake_capture_counter++;
 599         }
 600         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 601         card->may_have_dropped_last_frame = false;
 602         card->type = card_type;
 603         if (card->output.get() != output) {
 604                 card->output.reset(output);
 605         }
 606
 607         PixelFormat pixel_format;
 608         if (card_type == CardType::FFMPEG_INPUT) {
 609                 pixel_format = capture->get_current_pixel_format();
 610         } else if (card_type == CardType::CEF_INPUT) {
 611                 pixel_format = PixelFormat_8BitBGRA;
 612         } else if (global_flags.bit_depth > 8) {
 613                 pixel_format = PixelFormat_10BitYCbCr;
 614         } else {
 615                 pixel_format = PixelFormat_8BitYCbCr;
 616         }
 617
 618         if (is_active) {
 619                 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 620                 if (card->frame_allocator == nullptr) {
 621                         card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 622                 } else {
 623                         // The format could have changed, but we cannot reset the allocator
 624                         // and create a new one from scratch, since there may be allocated
 625                         // frames from it that expect to call release_frame() on it.
 626                         // Instead, ask the allocator to create new frames for us and discard
 627                         // any old ones as they come back. This takes the mutex while
 628                         // allocating, but nothing should really be sending frames in there
 629                         // right now anyway (start_bm_capture() has not been called yet).
 630                         card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 631                 }
 632                 card->capture->set_video_frame_allocator(card->frame_allocator.get());
 633                 if (card->surface == nullptr) {
 634                         card->surface = create_surface_with_same_format(mixer_surface);
 635                 }
 636                 while (!card->new_frames.empty()) card->new_frames.pop_front();
 637                 card->last_timecode = -1;
 638                 card->capture->set_pixel_format(pixel_format);
 639                 card->capture->configure_card();
 640
 641                 // NOTE: start_bm_capture() happens in thread_func().
 642         }
 643
 644         if (is_srt_card) {
 645                 assert(card_type == CardType::FFMPEG_INPUT);
 646         }
 647
 648         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 649         unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
 650         if (is_active) {
 651                 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
 652         } else {
 653                 // Note: Keeps the previous name, if any.
 654                 char name[32];
 655                 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
 656                 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
 657         }
 658         audio_mixer->reset_resampler(device);
 659         audio_mixer->trigger_state_changed_callback();
 660
 661         // Unregister old metrics, if any.
 662         if (!card->labels.empty()) {
 663                 const vector<pair<string, string>> &labels = card->labels;
 664                 card->jitter_history.unregister_metrics(labels);
 665                 card->queue_length_policy.unregister_metrics(labels);
 666                 global_metrics.remove_if_exists("input_received_frames", labels);
 667                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 668                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 669                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 670                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 671                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 672
 673                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 674                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 675                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 676                 global_metrics.remove_if_exists("input_width_pixels", labels);
 677                 global_metrics.remove_if_exists("input_height_pixels", labels);
 678                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 679                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 680                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 681
 682                 // SRT metrics.
 683
 684                 // Global measurements (counters).
 685                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 686                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 687                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 688                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 689
 690                 vector<pair<string, string>> packet_labels = card->labels;
 691                 packet_labels.emplace_back("type", "normal");
 692                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 693                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 694
 695                 packet_labels.back().second = "lost";
 696                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 697                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 698
 699                 packet_labels.back().second = "retransmitted";
 700                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 701                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 702
 703                 packet_labels.back().second = "ack";
 704                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 705                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 706
 707                 packet_labels.back().second = "nak";
 708                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 709                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 710
 711                 packet_labels.back().second = "dropped";
 712                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 713                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 714                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 715                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 716
 717                 packet_labels.back().second = "undecryptable";
 718                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 719                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 720
 721                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 722                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 723                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 724                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 725
 726                 // Instant measurements (gauges).
 727                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 728                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 729                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 730                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 731                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 732                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 733                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 734                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 735                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 736                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 737
 738                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 739                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 740                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 741                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 742
 743                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 744                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 745                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 746                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 747         }
 748
 749         if (is_active) {
 750                 // Register metrics.
 751                 vector<pair<string, string>> labels;
 752                 char card_name[64];
 753                 snprintf(card_name, sizeof(card_name), "%d", card_index);
 754                 labels.emplace_back("card", card_name);
 755
 756                 switch (card_type) {
 757                 case CardType::LIVE_CARD:
 758                         labels.emplace_back("cardtype", "live");
 759                         break;
 760                 case CardType::FAKE_CAPTURE:
 761                         labels.emplace_back("cardtype", "fake");
 762                         break;
 763                 case CardType::FFMPEG_INPUT:
 764                         if (is_srt_card) {
 765                                 labels.emplace_back("cardtype", "srt");
 766                         } else {
 767                                 labels.emplace_back("cardtype", "ffmpeg");
 768                         }
 769                         break;
 770                 case CardType::CEF_INPUT:
 771                         labels.emplace_back("cardtype", "cef");
 772                         break;
 773                 default:
 774                         assert(false);
 775                 }
 776                 card->jitter_history.register_metrics(labels);
 777                 card->queue_length_policy.register_metrics(labels);
 778                 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 779                 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 780                 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 781                 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 782                 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 783                 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 784
 785                 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 786                 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 787                 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 788                 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 789                 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 790                 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 791                 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 792                 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 793
 794                 if (is_srt_card) {
 795                         // Global measurements (counters).
 796                         global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 797                         global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 798                         global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 799                         global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 800
 801                         vector<pair<string, string>> packet_labels = labels;
 802                         packet_labels.emplace_back("type", "normal");
 803                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 804                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 805
 806                         packet_labels.back().second = "lost";
 807                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 808                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 809
 810                         packet_labels.back().second = "retransmitted";
 811                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 812                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 813
 814                         packet_labels.back().second = "ack";
 815                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 816                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 817
 818                         packet_labels.back().second = "nak";
 819                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 820                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 821
 822                         packet_labels.back().second = "dropped";
 823                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 824                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 825                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 826                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 827
 828                         packet_labels.back().second = "undecryptable";
 829                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 830                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 831
 832                         global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 833                         global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 834                         global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 835                         global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 836
 837                         // Instant measurements (gauges).
 838                         global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 839                         global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 840                         global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 841                         global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 842                         global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 843                         global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 844                         global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 845                         global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 846                         global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 847                         global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 848
 849                         global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 850                         global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 851                         global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 852                         global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 853
 854                         global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 855                         global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 856                         global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 857                         global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 858                 }
 859
 860                 card->labels = labels;
 861         } else {
 862                 card->labels.clear();
 863         }
 864 }
 865
 866 void Mixer::set_output_card_internal(int card_index)
 867 {
 868         // We don't really need to take card_mutex, since we're in the mixer
 869         // thread and don't mess with any queues (which is the only thing that happens
 870         // from other threads), but it's probably the safest in the long run.
 871         unique_lock<mutex> lock(card_mutex);
 872         if (output_card_index != -1) {
 873                 // Switch the old card from output to input.
 874                 CaptureCard *old_card = &cards[output_card_index];
 875                 old_card->output->end_output();
 876
 877                 // Stop the fake card that we put into place.
 878                 // This needs to _not_ happen under the mutex, to avoid deadlock
 879                 // (delivering the last frame needs to take the mutex).
 880                 CaptureInterface *fake_capture = old_card->capture.get();
 881                 lock.unlock();
 882                 fake_capture->stop_dequeue_thread();
 883                 lock.lock();
 884                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 885                 old_card->is_fake_capture = false;
 886                 old_card->capture->start_bm_capture();
 887         }
 888         if (card_index != -1) {
 889                 CaptureCard *card = &cards[card_index];
 890                 CaptureInterface *capture = card->capture.get();
 891                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 892                 // several seconds to complete (blocking on DisableVideoInput);
 893                 // see if we can maybe do it asynchronously.
 894                 lock.unlock();
 895                 capture->stop_dequeue_thread();
 896                 lock.lock();
 897                 card->parked_capture = move(card->capture);
 898                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 899                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
 900                 card->jitter_history.clear();
 901                 card->capture->start_bm_capture();
 902                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 903                 card->output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/output_card_is_master);
 904         }
 905         output_card_index = card_index;
 906         output_jitter_history.clear();
 907 }
 908
 909 namespace {
 910
 911 int unwrap_timecode(uint16_t current_wrapped, int last)
 912 {
 913         uint16_t last_wrapped = last & 0xffff;
 914         if (current_wrapped > last_wrapped) {
 915                 return (last & ~0xffff) | current_wrapped;
 916         } else {
 917                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 918         }
 919 }
 920
 921 }  // namespace
 922
 923 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 924                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 925                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 926 {
 927         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 928         CaptureCard *card = &cards[card_index];
 929
 930         ++card->metric_input_received_frames;
 931         card->metric_input_has_signal_bool = video_format.has_signal;
 932         card->metric_input_is_connected_bool = video_format.is_connected;
 933         card->metric_input_interlaced_bool = video_format.interlaced;
 934         card->metric_input_width_pixels = video_format.width;
 935         card->metric_input_height_pixels = video_format.height;
 936         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 937         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 938         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 939
 940         if (is_mode_scanning[card_index]) {
 941                 if (video_format.has_signal) {
 942                         // Found a stable signal, so stop scanning.
 943                         is_mode_scanning[card_index] = false;
 944                 } else {
 945                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 946                         steady_clock::time_point now = steady_clock::now();
 947                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 948                         if (sec_since_last_switch > switch_time_s) {
 949                                 // It isn't this mode; try the next one.
 950                                 mode_scanlist_index[card_index]++;
 951                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 952                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 953                                 last_mode_scan_change[card_index] = now;
 954                         }
 955                 }
 956         }
 957
 958         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 959         assert(frame_length > 0);
 960
 961         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;
 962         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 963                 printf("%s: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
 964                         description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
 965                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 966                 if (video_frame.owner) {
 967                         video_frame.owner->release_frame(video_frame);
 968                 }
 969                 if (audio_frame.owner) {
 970                         audio_frame.owner->release_frame(audio_frame);
 971                 }
 972                 return;
 973         }
 974
 975         int dropped_frames = 0;
 976         if (card->last_timecode != -1) {
 977                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 978         }
 979
 980         // Number of samples per frame if we need to insert silence.
 981         // (Could be nonintegral, but resampling will save us then.)
 982         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 983
 984         if (dropped_frames > MAX_FPS * 2) {
 985                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 986                         description_for_card(card_index).c_str(), card->last_timecode, timecode);
 987                 audio_mixer->reset_resampler(device);
 988                 dropped_frames = 0;
 989                 ++card->metric_input_resets;
 990         } else if (dropped_frames > 0) {
 991                 // Insert silence as needed.
 992                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 993                         description_for_card(card_index).c_str(), dropped_frames, timecode);
 994                 card->metric_input_dropped_frames_error += dropped_frames;
 995
 996                 bool success;
 997                 do {
 998                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 999                 } while (!success);
1000         }
1001
1002         if (num_samples > 0) {
1003                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
1004
1005                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
1006                 // just gets dropped for now.
1007                 //
1008                 // Only bother doing MJPEG encoding if there are any connected clients
1009                 // that want the stream.
1010                 if (httpd.get_num_connected_multicam_clients() > 0 ||
1011                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
1012                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
1013                         lock_guard<mutex> lock(card_mutex);
1014                         if (card->new_raw_audio.empty()) {
1015                                 card->new_raw_audio = move(converted_samples);
1016                         } else {
1017                                 // For raw audio, we don't really synchronize audio and video;
1018                                 // we just put the audio in frame by frame, and if a video frame is
1019                                 // dropped, we still keep the audio, which means it will be added
1020                                 // to the beginning of the next frame. It would probably be better
1021                                 // to move the audio pts earlier to show this, but most players can
1022                                 // live with some jitter, and in a lot of ways, it's much nicer for
1023                                 // Futatabi to have all audio locked to a video frame.
1024                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1025
1026                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1027                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1028                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1029                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1030                                 }
1031                         }
1032                 }
1033         }
1034
1035         // Done with the audio, so release it.
1036         if (audio_frame.owner) {
1037                 audio_frame.owner->release_frame(audio_frame);
1038         }
1039
1040         card->last_timecode = timecode;
1041
1042         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1043         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1044                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1045                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1046                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1047         }
1048 #ifdef HAVE_SRT
1049         if (card->type == CardType::FFMPEG_INPUT) {
1050                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1051                 if (srt_sock != -1) {
1052                         update_srt_stats(srt_sock, card);
1053                 }
1054         }
1055 #endif
1056
1057         size_t y_offset, cbcr_offset;
1058         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1059         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1060                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1061                 assert(card->type == CardType::FFMPEG_INPUT);
1062                 assert(video_offset == 0);
1063                 expected_length = video_frame.len;
1064
1065                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1066                 y_offset = 0;
1067                 cbcr_offset = video_format.width * video_format.height;
1068         } else {
1069                 // All the other Y'CbCr formats are 4:2:2.
1070                 y_offset = video_frame.size / 2 + video_offset / 2;
1071                 cbcr_offset = video_offset / 2;
1072         }
1073         if (video_frame.len - video_offset == 0 ||
1074             video_frame.len - video_offset != expected_length) {
1075                 if (video_frame.len != 0) {
1076                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1077                                 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1078                 }
1079                 if (video_frame.owner) {
1080                         video_frame.owner->release_frame(video_frame);
1081                 }
1082
1083                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1084                 // so that pts can go up accordingly.
1085                 {
1086                         lock_guard<mutex> lock(card_mutex);
1087                         CaptureCard::NewFrame new_frame;
1088                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1089                         new_frame.length = frame_length;
1090                         new_frame.interlaced = false;
1091                         new_frame.dropped_frames = dropped_frames;
1092                         new_frame.received_timestamp = video_frame.received_timestamp;
1093                         card->new_frames.push_back(move(new_frame));
1094                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1095                 }
1096                 card->new_frames_changed.notify_all();
1097                 return;
1098         }
1099
1100         unsigned num_fields = video_format.interlaced ? 2 : 1;
1101         steady_clock::time_point frame_upload_start;
1102         if (video_format.interlaced) {
1103                 // Send the two fields along as separate frames; the other side will need to add
1104                 // a deinterlacer to actually get this right.
1105                 assert(video_format.height % 2 == 0);
1106                 video_format.height /= 2;
1107                 assert(frame_length % 2 == 0);
1108                 frame_length /= 2;
1109                 num_fields = 2;
1110                 frame_upload_start = steady_clock::now();
1111         }
1112         assert(userdata != nullptr);
1113         userdata->last_interlaced = video_format.interlaced;
1114         userdata->last_has_signal = video_format.has_signal;
1115         userdata->last_is_connected = video_format.is_connected;
1116         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1117         userdata->last_frame_rate_den = video_format.frame_rate_den;
1118         RefCountedFrame frame(video_frame);
1119
1120         // Send the frames on to the main thread, which will upload and process htem.
1121         // It is entirely possible to upload them in the same thread (and it might even be
1122         // faster, depending on the GPU and driver), but it appears to be trickling
1123         // driver bugs very easily.
1124         //
1125         // Note that this means we must hold on to the actual frame data in <userdata>
1126         // until the upload is done, but we hold on to <frame> much longer than that
1127         // (in fact, all the way until we no longer use the texture in rendering).
1128         for (unsigned field = 0; field < num_fields; ++field) {
1129                 if (field == 1) {
1130                         // Don't upload the second field as fast as we can; wait until
1131                         // the field time has approximately passed. (Otherwise, we could
1132                         // get timing jitter against the other sources, and possibly also
1133                         // against the video display, although the latter is not as critical.)
1134                         // This requires our system clock to be reasonably close to the
1135                         // video clock, but that's not an unreasonable assumption.
1136                         steady_clock::time_point second_field_start = frame_upload_start +
1137                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1138                         this_thread::sleep_until(second_field_start);
1139                 }
1140
1141                 {
1142                         lock_guard<mutex> lock(card_mutex);
1143                         CaptureCard::NewFrame new_frame;
1144                         new_frame.frame = frame;
1145                         new_frame.length = frame_length;
1146                         new_frame.field = field;
1147                         new_frame.interlaced = video_format.interlaced;
1148                         new_frame.dropped_frames = dropped_frames;
1149                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1150                         new_frame.video_format = video_format;
1151                         new_frame.video_offset = video_offset;
1152                         new_frame.y_offset = y_offset;
1153                         new_frame.cbcr_offset = cbcr_offset;
1154                         new_frame.texture_uploaded = false;
1155                         if (card->type == CardType::FFMPEG_INPUT) {
1156                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1157                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1158                         }
1159                         card->new_frames.push_back(move(new_frame));
1160                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1161                         card->may_have_dropped_last_frame = false;
1162                 }
1163                 card->new_frames_changed.notify_all();
1164         }
1165 }
1166
1167 void Mixer::upload_texture_for_frame(
1168         int field, bmusb::VideoFormat video_format,
1169         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1170 {
1171         size_t cbcr_width, cbcr_height;
1172         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1173                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1174                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1175         } else {
1176                 // All the other Y'CbCr formats are 4:2:2.
1177                 cbcr_width = video_format.width / 2;
1178                 cbcr_height = video_format.height;
1179         }
1180
1181         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1182         if (video_format.interlaced) {
1183                 cbcr_height /= 2;
1184         }
1185
1186         unsigned field_start_line;
1187         if (field == 1) {
1188                 field_start_line = video_format.second_field_start;
1189         } else {
1190                 field_start_line = video_format.extra_lines_top;
1191         }
1192
1193         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1194         size_t v210_width = video_format.stride / sizeof(uint32_t);
1195         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1196
1197         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1198         check_error();
1199
1200         switch (userdata->pixel_format) {
1201                 case PixelFormat_10BitYCbCr: {
1202                         size_t field_start = video_offset + video_format.stride * field_start_line;
1203                         upload_texture(userdata->tex_v210[field], v210_width, video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, field_start);
1204                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1205                         break;
1206                 }
1207                 case PixelFormat_8BitYCbCr: {
1208                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1209                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1210
1211                         // Make up our own strides, since we are interleaving.
1212                         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);
1213                         upload_texture(userdata->tex_cbcr[field], cbcr_width, cbcr_height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
1214                         break;
1215                 }
1216                 case PixelFormat_8BitYCbCrPlanar: {
1217                         assert(field_start_line == 0);  // We don't really support interlaced here.
1218                         size_t field_y_start = y_offset;
1219                         size_t field_cb_start = cbcr_offset;
1220                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1221
1222                         // Make up our own strides, since we are interleaving.
1223                         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);
1224                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1225                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1226                         break;
1227                 }
1228                 case PixelFormat_8BitBGRA: {
1229                         size_t field_start = video_offset + video_format.stride * field_start_line;
1230                         upload_texture(userdata->tex_rgba[field], video_format.width, video_format.height, video_format.stride, interlaced_stride, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, field_start);
1231                         // These could be asked to deliver mipmaps at any time.
1232                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1233                         check_error();
1234                         glGenerateMipmap(GL_TEXTURE_2D);
1235                         check_error();
1236                         glBindTexture(GL_TEXTURE_2D, 0);
1237                         check_error();
1238                         break;
1239                 }
1240                 default:
1241                         assert(false);
1242         }
1243
1244         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1245         check_error();
1246 }
1247
1248 void Mixer::bm_hotplug_add(libusb_device *dev)
1249 {
1250         lock_guard<mutex> lock(hotplug_mutex);
1251         hotplugged_cards.push_back(dev);
1252 }
1253
1254 void Mixer::bm_hotplug_remove(unsigned card_index)
1255 {
1256         cards[card_index].new_frames_changed.notify_all();
1257 }
1258
1259 void Mixer::thread_func()
1260 {
1261         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1262
1263         eglBindAPI(EGL_OPENGL_API);
1264         QOpenGLContext *context = create_context(mixer_surface);
1265         if (!make_current(context, mixer_surface)) {
1266                 printf("oops\n");
1267                 abort();
1268         }
1269
1270         // Start the actual capture. (We don't want to do it before we're actually ready
1271         // to process output frames.)
1272         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1273                 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1274                         cards[card_index].capture->start_bm_capture();
1275                 }
1276         }
1277
1278         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1279         int stats_dropped_frames = 0;
1280
1281         while (!should_quit) {
1282                 if (desired_output_card_index != output_card_index) {
1283                         set_output_card_internal(desired_output_card_index);
1284                 }
1285                 if (output_card_index != -1 &&
1286                     desired_output_video_mode != output_video_mode) {
1287                         DeckLinkOutput *output = cards[output_card_index].output.get();
1288                         output->end_output();
1289                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1290                         output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/output_card_is_master);
1291                 }
1292
1293                 {
1294                         lock_guard<mutex> lock(card_mutex);
1295                         handle_hotplugged_cards();
1296                 }
1297
1298                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1299                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1300
1301                 bool master_card_is_output;
1302                 unsigned master_card_index;
1303                 if (output_card_index != -1 && output_card_is_master) {
1304                         master_card_is_output = true;
1305                         master_card_index = output_card_index;
1306                 } else {
1307                         master_card_is_output = false;
1308                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1309                         assert(master_card_index < MAX_VIDEO_CARDS);
1310                 }
1311
1312                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1313                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1314                 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);
1315                 stats_dropped_frames += output_frame_info.dropped_frames;
1316
1317                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1318                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1319                                 continue;
1320                         }
1321                         if (new_frames[card_index].frame->len == 0) {
1322                                 ++new_frames[card_index].dropped_frames;
1323                         }
1324                         if (new_frames[card_index].dropped_frames > 0) {
1325                                 printf("%s dropped %d frames before this\n",
1326                                         description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1327                         }
1328                 }
1329
1330                 // If the first card is reporting a corrupted or otherwise dropped frame,
1331                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1332                 if (!master_card_is_output &&
1333                     new_frames[master_card_index].frame != nullptr &&  // Timeout.
1334                     new_frames[master_card_index].frame->len == 0) {
1335                         ++stats_dropped_frames;
1336                         pts_int += new_frames[master_card_index].length;
1337                         continue;
1338                 }
1339
1340                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1341                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1342                                 continue;
1343
1344                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1345                         assert(new_frame->frame != nullptr);
1346                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1347                         check_error();
1348
1349                         // The new texture might need uploading before use.
1350                         if (!new_frame->texture_uploaded) {
1351                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1352                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1353                                 new_frame->texture_uploaded = true;
1354                         }
1355
1356                         // Only set the white balance if it actually changed. This means that the user
1357                         // is free to override the white balance in a video with no white balance information
1358                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1359                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1360                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1361                         // that the change takes effect on exactly the right frame.
1362                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1363                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1364                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1365                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1366                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1367                         }
1368
1369                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1370                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1371                                 mjpeg_encoder->upload_frame(pts_int, card_index, new_frame->frame, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset, move(raw_audio[card_index]), neutral_color);
1372                         }
1373
1374                 }
1375
1376                 int64_t frame_duration = output_frame_info.frame_duration;
1377                 render_one_frame(frame_duration);
1378                 {
1379                         lock_guard<mutex> lock(frame_num_mutex);
1380                         ++frame_num;
1381                 }
1382                 frame_num_updated.notify_all();
1383                 pts_int += frame_duration;
1384
1385                 basic_stats.update(frame_num, stats_dropped_frames);
1386                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1387
1388                 if (should_cut.exchange(false)) {  // Test and clear.
1389                         video_encoder->do_cut(frame_num);
1390                 }
1391
1392 #if 0
1393                 // Reset every 100 frames, so that local variations in frame times
1394                 // (especially for the first few frames, when the shaders are
1395                 // compiled etc.) don't make it hard to measure for the entire
1396                 // remaining duration of the program.
1397                 if (frame == 10000) {
1398                         frame = 0;
1399                         start = now;
1400                 }
1401 #endif
1402                 check_error();
1403         }
1404
1405         resource_pool->clean_context();
1406 }
1407
1408 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1409 {
1410         if (output_card_index != -1 && output_card_is_master) {
1411                 // The output card (ie., cards[output_card_index].output) is the master clock,
1412                 // so no input card (ie., cards[card_index].capture) is.
1413                 return false;
1414         }
1415         return (card_index == master_card_index);
1416 }
1417
1418 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1419 {
1420         // Count the number of frames in the queue, including any frames
1421         // we dropped. It's hard to know exactly how we should deal with
1422         // dropped (corrupted) input frames; they don't help our goal of
1423         // avoiding starvation, but they still add to the problem of latency.
1424         // Since dropped frames is going to mean a bump in the signal anyway,
1425         // we err on the side of having more stable latency instead.
1426         unsigned queue_length = 0;
1427         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1428                 queue_length += frame.dropped_frames + 1;
1429         }
1430
1431         // If needed, drop frames until the queue is below the safe limit.
1432         // We prefer to drop from the head, because all else being equal,
1433         // we'd like more recent frames (less latency).
1434         unsigned dropped_frames = 0;
1435         while (queue_length > safe_queue_length) {
1436                 assert(!card->new_frames.empty());
1437                 assert(queue_length > card->new_frames.front().dropped_frames);
1438                 queue_length -= card->new_frames.front().dropped_frames;
1439
1440                 if (queue_length <= safe_queue_length) {
1441                         // No need to drop anything.
1442                         break;
1443                 }
1444
1445                 card->new_frames.pop_front();
1446                 card->new_frames_changed.notify_all();
1447                 --queue_length;
1448                 ++dropped_frames;
1449
1450                 if (queue_length == 0 && card->is_cef_capture) {
1451                         card->may_have_dropped_last_frame = true;
1452                 }
1453         }
1454
1455         card->metric_input_dropped_frames_jitter += dropped_frames;
1456         card->metric_input_queue_length_frames = queue_length;
1457
1458 #if 0
1459         if (dropped_frames > 0) {
1460                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1461                         card_index, dropped_frames);
1462         }
1463 #endif
1464 }
1465
1466 pair<string, string> Mixer::get_channels_json()
1467 {
1468         Channels ret;
1469         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1470                 Channel *channel = ret.add_channel();
1471                 channel->set_index(channel_idx + 2);
1472                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1473                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1474         }
1475         string contents;
1476         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1477         return make_pair(contents, "text/json");
1478 }
1479
1480 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1481 {
1482         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1483 }
1484
1485 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], vector<int32_t> raw_audio[MAX_VIDEO_CARDS])
1486 {
1487         OutputFrameInfo output_frame_info;
1488         constexpr steady_clock::duration master_card_timeout = milliseconds(200);
1489 start:
1490         unique_lock<mutex> lock(card_mutex, defer_lock);
1491         bool timed_out = false;
1492         if (master_card_is_output) {
1493                 // Clocked to the output, so wait for it to be ready for the next frame.
1494                 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);
1495                 lock.lock();
1496         } else {
1497                 // Wait for the master card to have a new frame.
1498                 output_frame_info.is_preroll = false;
1499                 lock.lock();
1500                 timed_out = !cards[master_card_index].new_frames_changed.wait_for(lock,
1501                         master_card_timeout,
1502                         [this, master_card_index] {
1503                                 return !cards[master_card_index].new_frames.empty() ||
1504                                         cards[master_card_index].capture == nullptr ||
1505                                         cards[master_card_index].capture->get_disconnected();
1506                         });
1507                 if (timed_out) {
1508                         fprintf(stderr, "WARNING: Master card (%s) did not deliver a frame for %u ms, creating a fake one.\n",
1509                                 description_for_card(master_card_index).c_str(),
1510                                 unsigned(duration_cast<milliseconds>(master_card_timeout).count()));
1511                 }
1512         }
1513
1514         if (timed_out) {
1515                 // The master card stalled for 200 ms (possible when it's e.g.
1516                 // an SRT card). Send a frame no matter what; this also makes sure
1517                 // any other cards get to empty their queues, and in general,
1518                 // that we make _some_ sort of forward progress.
1519                 handle_hotplugged_cards();
1520         } else if (master_card_is_output) {
1521                 handle_hotplugged_cards();
1522         } else if (cards[master_card_index].new_frames.empty()) {
1523                 // We were woken up, but not due to a new frame. Deal with it
1524                 // and then restart.
1525                 assert(cards[master_card_index].capture == nullptr ||
1526                        cards[master_card_index].capture->get_disconnected());
1527                 handle_hotplugged_cards();
1528                 lock.unlock();
1529                 goto start;
1530         }
1531
1532         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1533                 CaptureCard *card = &cards[card_index];
1534                 if (card->new_frames.empty()) {  // Starvation.
1535                         ++card->metric_input_duped_frames;
1536 #ifdef HAVE_CEF
1537                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1538                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1539                                 // stream of frames, so we'll have to ask it to repaint the frame
1540                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1541                                 // trim the queue completely away, and cleared when we actually
1542                                 // get a new frame.)
1543                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1544                         }
1545 #endif
1546                 } else {
1547                         new_frames[card_index] = move(card->new_frames.front());
1548                         has_new_frame[card_index] = true;
1549                         card->new_frames.pop_front();
1550                         card->new_frames_changed.notify_all();
1551                 }
1552
1553                 raw_audio[card_index] = move(card->new_raw_audio);
1554         }
1555
1556         if (timed_out) {
1557                 // Pretend the frame happened a while ago and was only processed now,
1558                 // so that we get the duration sort-of right. This isn't ideal.
1559                 output_frame_info.dropped_frames = 0;  // Hard to define, really.
1560                 output_frame_info.frame_duration = lrint(TIMEBASE * duration<double>(master_card_timeout).count());
1561                 output_frame_info.frame_timestamp = steady_clock::now() - master_card_timeout;
1562         } else if (!master_card_is_output) {
1563                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1564                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1565                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1566         }
1567
1568         if (!output_frame_info.is_preroll) {
1569                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1570         }
1571
1572         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1573                 CaptureCard *card = &cards[card_index];
1574                 if (has_new_frame[card_index] &&
1575                     !input_card_is_master_clock(card_index, master_card_index) &&
1576                     !output_frame_info.is_preroll) {
1577                         card->queue_length_policy.update_policy(
1578                                 output_frame_info.frame_timestamp,
1579                                 card->jitter_history.get_expected_next_frame(),
1580                                 new_frames[master_card_index].length,
1581                                 output_frame_info.frame_duration,
1582                                 card->jitter_history.estimate_max_jitter(),
1583                                 output_jitter_history.estimate_max_jitter());
1584                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1585                                                   card->queue_length_policy.get_safe_queue_length()));
1586                 }
1587         }
1588
1589         // This might get off by a fractional sample when changing master card
1590         // between ones with different frame rates, but that's fine.
1591         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1592         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1593         fractional_samples = num_samples_times_timebase % TIMEBASE;
1594         assert(output_frame_info.num_samples >= 0);
1595
1596         if (timed_out) {
1597                 DeviceSpec device{InputSourceType::CAPTURE_CARD, master_card_index};
1598                 bool success;
1599                 do {
1600                         success = audio_mixer->add_silence(device, output_frame_info.num_samples, /*dropped_frames=*/0);
1601                 } while (!success);
1602         }
1603
1604         return output_frame_info;
1605 }
1606
1607 void Mixer::handle_hotplugged_cards()
1608 {
1609         // Check for cards that have been disconnected since last frame.
1610         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1611                 CaptureCard *card = &cards[card_index];
1612                 if (card->capture != nullptr && card->capture->get_disconnected()) {
1613                         bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
1614                         if (is_active) {
1615                                 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1616                                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1617                                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1618                                 card->jitter_history.clear();
1619                                 card->capture->start_bm_capture();
1620                         } else {
1621                                 // NOTE: The theme might end up forcing the card back at some later point
1622                                 // (ie., force_active is false now, but might immediately be true again on
1623                                 // e.g. the next frame). That should be rare, though, so we don't bother
1624                                 // adjusting the message.
1625                                 fprintf(stderr, "Card %u went away, removing. (To keep a fake card, increase --num-cards.)\n", card_index);
1626                                 theme->remove_card(card_index);
1627                                 configure_card(card_index, /*capture=*/nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1628                                 card->jitter_history.clear();
1629                         }
1630                 }
1631         }
1632
1633         // Count how many active cards we already have. Used below to check that we
1634         // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1635         // and HTML “cards” don't count towards this limit.
1636         int num_video_cards = 0;
1637         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1638                 CaptureCard *card = &cards[card_index];
1639                 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1640                         ++num_video_cards;
1641                 }
1642         }
1643
1644         // Check for cards that have been connected since last frame.
1645         vector<libusb_device *> hotplugged_cards_copy;
1646 #ifdef HAVE_SRT
1647         vector<int> hotplugged_srt_cards_copy;
1648 #endif
1649         {
1650                 lock_guard<mutex> lock(hotplug_mutex);
1651                 swap(hotplugged_cards, hotplugged_cards_copy);
1652 #ifdef HAVE_SRT
1653                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1654 #endif
1655         }
1656         for (libusb_device *new_dev : hotplugged_cards_copy) {
1657                 // Look for a fake capture card where we can stick this in.
1658                 int free_card_index = -1;
1659                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1660                         if (cards[card_index].is_fake_capture) {
1661                                 free_card_index = card_index;
1662                                 break;
1663                         }
1664                 }
1665
1666                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1667                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1668                         libusb_unref_device(new_dev);
1669                 } else {
1670                         // BMUSBCapture takes ownership.
1671                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1672                         CaptureCard *card = &cards[free_card_index];
1673                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1674                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1675                         card->jitter_history.clear();
1676                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1677                         capture->start_bm_capture();
1678                 }
1679         }
1680
1681 #ifdef HAVE_SRT
1682         // Same, for SRT inputs.
1683         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1684                 char name[256];
1685                 int namelen = sizeof(name);
1686                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1687                 string stream_id(name, namelen);
1688
1689                 // Look for a fake capture card where we can stick this in.
1690                 // Prioritize ones that previously held SRT streams with the
1691                 // same stream ID, if any exist -- and it multiple exist,
1692                 // take the one that disconnected the last.
1693                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1694                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1695                         CaptureCard *card = &cards[card_index];
1696                         if (!card->is_fake_capture) {
1697                                 continue;
1698                         }
1699                         if (first_free_card_index == -1) {
1700                                 first_free_card_index = card_index;
1701                         }
1702                         if (card->last_srt_stream_id == stream_id &&
1703                             (last_matching_free_card_index == -1 ||
1704                              card->fake_capture_counter >
1705                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1706                                 last_matching_free_card_index = card_index;
1707                         }
1708                 }
1709
1710                 const int free_card_index = (last_matching_free_card_index != -1)
1711                         ? last_matching_free_card_index : first_free_card_index;
1712                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1713                         if (stream_id.empty()) {
1714                                 stream_id = "no name";
1715                         }
1716                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1717                         srt_close(sock);
1718                 } else {
1719                         // FFmpegCapture takes ownership.
1720                         if (stream_id.empty()) {
1721                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1722                         } else {
1723                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1724                         }
1725                         CaptureCard *card = &cards[free_card_index];
1726                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1727                         capture->set_card_index(free_card_index);
1728                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1729                         update_srt_stats(sock, card);  // Initial zero stats.
1730                         card->last_srt_stream_id = stream_id;
1731                         card->jitter_history.clear();
1732                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1733                         capture->start_bm_capture();
1734                 }
1735         }
1736 #endif
1737
1738         // Finally, newly forced-to-active fake capture cards.
1739         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1740                 CaptureCard *card = &cards[card_index];
1741                 if (card->capture == nullptr && card->force_active) {
1742                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1743                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1744                         card->jitter_history.clear();
1745                         card->capture->start_bm_capture();
1746                 }
1747         }
1748 }
1749
1750
1751 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)
1752 {
1753         // Resample the audio as needed, including from previously dropped frames.
1754         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1755                 const bool dropped_frame = (frame_num != dropped_frames);
1756                 {
1757                         // Signal to the audio thread to process this frame.
1758                         // Note that if the frame is a dropped frame, we signal that
1759                         // we don't want to use this frame as base for adjusting
1760                         // the resampler rate. The reason for this is that the timing
1761                         // of these frames is often way too late; they typically don't
1762                         // “arrive” before we synthesize them. Thus, we could end up
1763                         // in a situation where we have inserted e.g. five audio frames
1764                         // into the queue before we then start pulling five of them
1765                         // back out. This makes ResamplingQueue overestimate the delay,
1766                         // causing undue resampler changes. (We _do_ use the last,
1767                         // non-dropped frame; perhaps we should just discard that as well,
1768                         // since dropped frames are expected to be rare, and it might be
1769                         // better to just wait until we have a slightly more normal situation).
1770                         lock_guard<mutex> lock(audio_mutex);
1771                         bool adjust_rate = !dropped_frame && !is_preroll;
1772                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1773                         audio_task_queue_changed.notify_one();
1774                 }
1775                 if (dropped_frame) {
1776                         // For dropped frames, increase the pts. Note that if the format changed
1777                         // in the meantime, we have no way of detecting that; we just have to
1778                         // assume the frame length is always the same.
1779                         pts_int += length_per_frame;
1780                 }
1781         }
1782 }
1783
1784 void Mixer::render_one_frame(int64_t duration)
1785 {
1786         // Determine the time code for this frame before we start rendering.
1787         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1788         if (display_timecode_on_stdout) {
1789                 printf("Timecode: '%s'\n", timecode_text.c_str());
1790         }
1791
1792         // Update Y'CbCr settings for all cards.
1793         {
1794                 lock_guard<mutex> lock(card_mutex);
1795                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1796                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1797                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1798                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1799                         input_state.full_range[card_index] = interpretation->full_range;
1800                 }
1801         }
1802
1803         // Get the main chain from the theme, and set its state immediately.
1804         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1805         EffectChain *chain = theme_main_chain.chain;
1806         theme_main_chain.setup_chain();
1807         //theme_main_chain.chain->enable_phase_timing(true);
1808
1809         // If HDMI/SDI output is active and the user has requested auto mode,
1810         // its mode overrides the existing Y'CbCr setting for the chain.
1811         YCbCrLumaCoefficients ycbcr_output_coefficients;
1812         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1813                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1814         } else {
1815                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1816         }
1817
1818         // TODO: Reduce the duplication against theme.cpp.
1819         YCbCrFormat output_ycbcr_format;
1820         output_ycbcr_format.chroma_subsampling_x = 1;
1821         output_ycbcr_format.chroma_subsampling_y = 1;
1822         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1823         output_ycbcr_format.full_range = false;
1824         output_ycbcr_format.num_levels = 1 << global_flags.bit_depth;
1825         chain->change_ycbcr_output_format(output_ycbcr_format);
1826
1827         // Render main chain. If we're using zerocopy Quick Sync encoding
1828         // (the default case), we take an extra copy of the created outputs,
1829         // so that we can display it back to the screen later (it's less memory
1830         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1831         // Ideally, we'd like to avoid taking copies and just use the main textures
1832         // for display as well, but they're just views into VA-API memory and must be
1833         // unmapped during encoding, so we can't use them for display, unfortunately.
1834         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1835         GLuint y_copy_tex, cbcr_copy_tex = 0;
1836         GLuint y_display_tex, cbcr_display_tex;
1837         GLenum y_type = (global_flags.bit_depth > 8) ? GL_R16 : GL_R8;
1838         GLenum cbcr_type = (global_flags.bit_depth > 8) ? GL_RG16 : GL_RG8;
1839         const bool is_zerocopy = video_encoder->is_zerocopy();
1840         if (is_zerocopy) {
1841                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1842                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1843                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1844
1845                 y_display_tex = y_copy_tex;
1846                 cbcr_display_tex = cbcr_copy_tex;
1847
1848                 // y_tex and cbcr_tex will be given by VideoEncoder.
1849         } else {
1850                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1851                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1852                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1853
1854                 y_display_tex = y_tex;
1855                 cbcr_display_tex = cbcr_tex;
1856         }
1857
1858         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1859         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1860         assert(got_frame);
1861
1862         GLuint fbo;
1863         if (is_zerocopy) {
1864                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1865         } else {
1866                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1867         }
1868         check_error();
1869         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1870
1871         if (display_timecode_in_stream) {
1872                 // Render the timecode on top.
1873                 timecode_renderer->render_timecode(fbo, timecode_text);
1874         }
1875
1876         resource_pool->release_fbo(fbo);
1877
1878         if (is_zerocopy) {
1879                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1880         } else {
1881                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1882         }
1883         if (output_card_index != -1) {
1884                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1885         }
1886         resource_pool->release_2d_texture(cbcr_full_tex);
1887
1888         // Set the right state for the Y' and CbCr textures we use for display.
1889         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1890         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1891         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1892         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1893         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1894
1895         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1896         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1897         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1898         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1899
1900         RefCountedGLsync fence = video_encoder->end_frame();
1901
1902         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1903         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1904         DisplayFrame live_frame;
1905         live_frame.chain = display_chain.get();
1906         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1907                 display_input->set_texture_num(0, y_display_tex);
1908                 display_input->set_texture_num(1, cbcr_display_tex);
1909         };
1910         live_frame.ready_fence = fence;
1911         live_frame.input_frames = {};
1912         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1913         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1914
1915         // Set up preview and any additional channels.
1916         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1917                 DisplayFrame display_frame;
1918                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1919                 display_frame.chain = move(chain.chain);
1920                 display_frame.setup_chain = move(chain.setup_chain);
1921                 display_frame.ready_fence = fence;
1922                 display_frame.input_frames = move(chain.input_frames);
1923                 display_frame.temp_textures = {};
1924                 output_channel[i].output_frame(move(display_frame));
1925         }
1926 }
1927
1928 void Mixer::audio_thread_func()
1929 {
1930         pthread_setname_np(pthread_self(), "Mixer_Audio");
1931
1932         while (!should_quit) {
1933                 AudioTask task;
1934
1935                 {
1936                         unique_lock<mutex> lock(audio_mutex);
1937                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1938                         if (should_quit) {
1939                                 return;
1940                         }
1941                         task = audio_task_queue.front();
1942                         audio_task_queue.pop();
1943                 }
1944
1945                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1946                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1947                 vector<float> samples_out = audio_mixer->get_output(
1948                         task.frame_timestamp,
1949                         task.num_samples,
1950                         rate_adjustment_policy);
1951
1952                 // Send the samples to the sound card, then add them to the output.
1953                 if (alsa) {
1954                         alsa->write(samples_out);
1955                 }
1956                 if (output_card_index != -1) {
1957                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1958                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1959                 }
1960                 video_encoder->add_audio(task.pts_int, move(samples_out));
1961         }
1962 }
1963
1964 void Mixer::release_display_frame(DisplayFrame *frame)
1965 {
1966         for (GLuint texnum : frame->temp_textures) {
1967                 resource_pool->release_2d_texture(texnum);
1968         }
1969         frame->temp_textures.clear();
1970         frame->ready_fence.reset();
1971         frame->input_frames.clear();
1972 }
1973
1974 void Mixer::start()
1975 {
1976         mixer_thread = thread(&Mixer::thread_func, this);
1977         audio_thread = thread(&Mixer::audio_thread_func, this);
1978 }
1979
1980 void Mixer::quit()
1981 {
1982         should_quit = true;
1983         audio_task_queue_changed.notify_one();
1984         mixer_thread.join();
1985         audio_thread.join();
1986 #ifdef HAVE_SRT
1987         if (global_flags.srt_port >= 0) {
1988                 // There's seemingly no other reasonable way to wake up the thread
1989                 // (libsrt's epoll equivalent is busy-waiting).
1990                 int sock = srt_create_socket();
1991                 if (sock != -1) {
1992                         sockaddr_in6 addr;
1993                         memset(&addr, 0, sizeof(addr));
1994                         addr.sin6_family = AF_INET6;
1995                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1996                         addr.sin6_port = htons(global_flags.srt_port);
1997                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1998                         srt_close(sock);
1999                 }
2000                 srt_thread.join();
2001         }
2002 #endif
2003 }
2004
2005 void Mixer::transition_clicked(int transition_num)
2006 {
2007         theme->transition_clicked(transition_num, pts());
2008 }
2009
2010 void Mixer::channel_clicked(int preview_num)
2011 {
2012         theme->channel_clicked(preview_num);
2013 }
2014
2015 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
2016 {
2017         lock_guard<mutex> lock(card_mutex);
2018         return ycbcr_interpretation[card_index];
2019 }
2020
2021 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
2022 {
2023         lock_guard<mutex> lock(card_mutex);
2024         ycbcr_interpretation[card_index] = interpretation;
2025 }
2026
2027 void Mixer::start_mode_scanning(unsigned card_index)
2028 {
2029         assert(card_index < MAX_VIDEO_CARDS);
2030         if (cards[card_index].capture == nullptr) {
2031                 // Inactive card. Should never happen.
2032                 return;
2033         }
2034         if (is_mode_scanning[card_index]) {
2035                 return;
2036         }
2037         is_mode_scanning[card_index] = true;
2038         mode_scanlist[card_index].clear();
2039         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
2040                 mode_scanlist[card_index].push_back(mode.first);
2041         }
2042         assert(!mode_scanlist[card_index].empty());
2043         mode_scanlist_index[card_index] = 0;
2044         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
2045         last_mode_scan_change[card_index] = steady_clock::now();
2046 }
2047
2048 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
2049 {
2050         assert(desired_output_card_index != -1);
2051         lock_guard<mutex> lock(card_mutex);
2052         return cards[desired_output_card_index].output->get_available_video_modes();
2053 }
2054
2055 string Mixer::get_ffmpeg_filename(unsigned card_index) const
2056 {
2057         assert(card_index < MAX_VIDEO_CARDS);
2058         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2059         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
2060 }
2061
2062 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
2063         assert(card_index < MAX_VIDEO_CARDS);
2064         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2065         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2066 }
2067
2068 void Mixer::wait_for_next_frame()
2069 {
2070         unique_lock<mutex> lock(frame_num_mutex);
2071         unsigned old_frame_num = frame_num;
2072         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
2073                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2074 }
2075
2076 Mixer::OutputChannel::~OutputChannel()
2077 {
2078         if (has_current_frame) {
2079                 parent->release_display_frame(&current_frame);
2080         }
2081         if (has_ready_frame) {
2082                 parent->release_display_frame(&ready_frame);
2083         }
2084 }
2085
2086 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2087 {
2088         // Store this frame for display. Remove the ready frame if any
2089         // (it was seemingly never used).
2090         {
2091                 lock_guard<mutex> lock(frame_mutex);
2092                 if (has_ready_frame) {
2093                         parent->release_display_frame(&ready_frame);
2094                 }
2095                 ready_frame = move(frame);
2096                 has_ready_frame = true;
2097
2098                 // Call the callbacks under the mutex (they should be short),
2099                 // so that we don't race against a callback removal.
2100                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2101                         key_and_callback.second();
2102                 }
2103         }
2104
2105         // Reduce the number of callbacks by filtering duplicates. The reason
2106         // why we bother doing this is that Qt seemingly can get into a state
2107         // where its builds up an essentially unbounded queue of signals,
2108         // consuming more and more memory, and there's no good way of collapsing
2109         // user-defined signals or limiting the length of the queue.
2110         if (transition_names_updated_callback) {
2111                 vector<string> transition_names = global_mixer->get_transition_names();
2112                 bool changed = false;
2113                 if (transition_names.size() != last_transition_names.size()) {
2114                         changed = true;
2115                 } else {
2116                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2117                                 if (transition_names[i] != last_transition_names[i]) {
2118                                         changed = true;
2119                                         break;
2120                                 }
2121                         }
2122                 }
2123                 if (changed) {
2124                         transition_names_updated_callback(transition_names);
2125                         last_transition_names = transition_names;
2126                 }
2127         }
2128         if (name_updated_callback) {
2129                 string name = global_mixer->get_channel_name(channel);
2130                 if (name != last_name) {
2131                         name_updated_callback(name);
2132                         last_name = name;
2133                 }
2134         }
2135         if (color_updated_callback) {
2136                 string color = global_mixer->get_channel_color(channel);
2137                 if (color != last_color) {
2138                         color_updated_callback(color);
2139                         last_color = color;
2140                 }
2141         }
2142 }
2143
2144 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2145 {
2146         lock_guard<mutex> lock(frame_mutex);
2147         if (!has_current_frame && !has_ready_frame) {
2148                 return false;
2149         }
2150
2151         if (has_current_frame && has_ready_frame) {
2152                 // We have a new ready frame. Toss the current one.
2153                 parent->release_display_frame(&current_frame);
2154                 has_current_frame = false;
2155         }
2156         if (has_ready_frame) {
2157                 assert(!has_current_frame);
2158                 current_frame = move(ready_frame);
2159                 ready_frame.ready_fence.reset();  // Drop the refcount.
2160                 ready_frame.input_frames.clear();  // Drop the refcounts.
2161                 has_current_frame = true;
2162                 has_ready_frame = false;
2163         }
2164
2165         *frame = current_frame;
2166         return true;
2167 }
2168
2169 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2170 {
2171         lock_guard<mutex> lock(frame_mutex);
2172         new_frame_ready_callbacks[key] = callback;
2173 }
2174
2175 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2176 {
2177         lock_guard<mutex> lock(frame_mutex);
2178         new_frame_ready_callbacks.erase(key);
2179 }
2180
2181 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2182 {
2183         transition_names_updated_callback = callback;
2184 }
2185
2186 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2187 {
2188         name_updated_callback = callback;
2189 }
2190
2191 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2192 {
2193         color_updated_callback = callback;
2194 }
2195
2196 #ifdef HAVE_SRT
2197 void Mixer::start_srt()
2198 {
2199         SRTSOCKET sock = srt_create_socket();
2200         sockaddr_in6 addr;
2201         memset(&addr, 0, sizeof(addr));
2202         addr.sin6_family = AF_INET6;
2203         addr.sin6_port = htons(global_flags.srt_port);
2204
2205         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2206         if (err != 0) {
2207                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2208                 abort();
2209         }
2210         err = srt_listen(sock, MAX_VIDEO_CARDS);
2211         if (err != 0) {
2212                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2213                 abort();
2214         }
2215
2216         srt_thread = thread([this, sock] {
2217                 sockaddr_in6 addr;
2218                 for ( ;; ) {
2219                         int sa_len = sizeof(addr);
2220                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2221                         if (should_quit) {
2222                                 if (clientsock != -1) {
2223                                         srt_close(clientsock);
2224                                 }
2225                                 break;
2226                         }
2227                         if (!global_flags.enable_srt) {  // Runtime UI toggle.
2228                                 // Perhaps not as good as never listening in the first place,
2229                                 // but much simpler to turn on and off.
2230                                 srt_close(clientsock);
2231                                 continue;
2232                         }
2233                         lock_guard<mutex> lock(hotplug_mutex);
2234                         hotplugged_srt_cards.push_back(clientsock);
2235                 }
2236                 srt_close(sock);
2237         });
2238 }
2239 #endif
2240
2241 #ifdef HAVE_SRT
2242 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2243 {
2244         SRT_TRACEBSTATS stats;
2245         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2246
2247         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2248         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2249         card->metric_srt_sent_bytes = stats.byteSentTotal;
2250         card->metric_srt_received_bytes = stats.byteRecvTotal;
2251         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2252         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2253         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2254         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2255         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2256         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2257         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2258         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2259         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2260         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2261         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2262         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2263         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2264         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2265         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2266         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2267         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2268         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2269         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2270         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2271
2272         // Gauges.
2273         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2274         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2275         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2276         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2277         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2278         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2279         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2280         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2281         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2282         card->metric_srt_mss_bytes = stats.byteMSS;
2283         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2284         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2285         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2286         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2287         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2288         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2289         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2290         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2291 }
2292 #endif
2293
2294 string Mixer::description_for_card(unsigned card_index)
2295 {
2296         CaptureCard *card = &cards[card_index];
2297         if (card->capture == nullptr) {
2298                 // Should never be called for inactive cards, but OK.
2299                 char buf[256];
2300                 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2301                 return buf;
2302         }
2303         if (card->type != CardType::FFMPEG_INPUT) {
2304                 char buf[256];
2305                 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2306                 return buf;
2307         }
2308
2309         // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2310         // since it's not too obvious for the user that they are “cards”.
2311         unsigned ffmpeg_index = 0;
2312         for (unsigned i = 0; i < card_index; ++i) {
2313                 CaptureCard *other_card = &cards[i];
2314                 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2315                         ++ffmpeg_index;
2316                 }
2317         }
2318         char buf[256];
2319         snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2320         return buf;
2321 }
2322
2323 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2324 {
2325 #ifdef HAVE_SRT
2326         if (card->type == CardType::FFMPEG_INPUT) {
2327                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2328                 return srt_sock != -1;
2329         }
2330 #endif
2331         return false;
2332 }
2333
2334 mutex RefCountedGLsync::fence_lock;