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 "defs.h"
  45 #include "shared/disk_space_estimator.h"
  46 #include "ffmpeg_capture.h"
  47 #include "flags.h"
  48 #include "image_input.h"
  49 #include "input_mapping.h"
  50 #include "shared/metrics.h"
  51 #include "shared/va_display.h"
  52 #include "mjpeg_encoder.h"
  53 #include "pbo_frame_allocator.h"
  54 #include "shared/ref_counted_gl_sync.h"
  55 #include "resampling_queue.h"
  56 #include "shared/timebase.h"
  57 #include "timecode_renderer.h"
  58 #include "v210_converter.h"
  59 #include "video_encoder.h"
  60
  61 #undef Status
  62 #include <google/protobuf/util/json_util.h>
  63 #include "json.pb.h"
  64
  65 #ifdef HAVE_SRT
  66 // Must come after CEF, since it includes <syslog.h>, which has #defines
  67 // that conflict with CEF logging constants.
  68 #include <srt/srt.h>
  69 #endif
  70
  71 class IDeckLink;
  72 class QOpenGLContext;
  73
  74 using namespace movit;
  75 using namespace std;
  76 using namespace std::chrono;
  77 using namespace std::placeholders;
  78 using namespace bmusb;
  79
  80 Mixer *global_mixer = nullptr;
  81
  82 namespace {
  83
  84 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  85 {
  86         if (interlaced) {
  87                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  88                         input_state->buffered_frames[card_index][frame_num] =
  89                                 input_state->buffered_frames[card_index][frame_num - 1];
  90                 }
  91                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  92         } else {
  93                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  94                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  95                 }
  96         }
  97 }
  98
  99 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
 100 {
 101         bool first;
 102         switch (userdata->pixel_format) {
 103         case PixelFormat_10BitYCbCr:
 104                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
 105                 break;
 106         case PixelFormat_8BitYCbCr:
 107                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
 108                 break;
 109         case PixelFormat_8BitBGRA:
 110                 first = userdata->tex_rgba[field] == 0;
 111                 break;
 112         case PixelFormat_8BitYCbCrPlanar:
 113                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 114                 break;
 115         default:
 116                 assert(false);
 117         }
 118
 119         const bool recreate_main_texture =
 120                 first ||
 121                 width != userdata->last_width[field] ||
 122                 height != userdata->last_height[field] ||
 123                 cbcr_width != userdata->last_cbcr_width[field] ||
 124                 cbcr_height != userdata->last_cbcr_height[field];
 125         const bool recreate_v210_texture =
 126                 global_flags.ten_bit_input &&
 127                 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
 128
 129         if (recreate_main_texture) {
 130                 // We changed resolution since last use of this texture, so we need to create
 131                 // a new object. Note that this each card has its own PBOFrameAllocator,
 132                 // we don't need to worry about these flip-flopping between resolutions.
 133                 switch (userdata->pixel_format) {
 134                 case PixelFormat_10BitYCbCr:
 135                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 136                         check_error();
 137                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 138                         check_error();
 139                         break;
 140                 case PixelFormat_8BitYCbCr: {
 141                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 142                         check_error();
 143                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 144                         check_error();
 145                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 146                         check_error();
 147                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 148                         check_error();
 149                         break;
 150                 }
 151                 case PixelFormat_8BitYCbCrPlanar: {
 152                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 153                         check_error();
 154                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 155                         check_error();
 156                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 157                         check_error();
 158                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 159                         check_error();
 160                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 161                         check_error();
 162                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 163                         check_error();
 164                         break;
 165                 }
 166                 case PixelFormat_8BitBGRA:
 167                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 168                         check_error();
 169                         // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
 170                         glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 171                         check_error();
 172                         break;
 173                 default:
 174                         assert(false);
 175                 }
 176                 userdata->last_width[field] = width;
 177                 userdata->last_height[field] = height;
 178                 userdata->last_cbcr_width[field] = cbcr_width;
 179                 userdata->last_cbcr_height[field] = cbcr_height;
 180         }
 181         if (recreate_v210_texture) {
 182                 // Same as above; we need to recreate the texture.
 183                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 184                 check_error();
 185                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 186                 check_error();
 187                 userdata->last_v210_width[field] = v210_width;
 188                 userdata->last_height[field] = height;
 189         }
 190 }
 191
 192 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 193 {
 194         if (interlaced_stride) {
 195                 stride *= 2;
 196         }
 197         if (global_flags.flush_pbos) {
 198                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 199                 check_error();
 200         }
 201
 202         glBindTexture(GL_TEXTURE_2D, tex);
 203         check_error();
 204         if (interlaced_stride) {
 205                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 206                 check_error();
 207         } else {
 208                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 209                 check_error();
 210         }
 211
 212         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 213         check_error();
 214         glBindTexture(GL_TEXTURE_2D, 0);
 215         check_error();
 216         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 217         check_error();
 218 }
 219
 220 }  // namespace
 221
 222 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 223 {
 224         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 225         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 226 }
 227
 228 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 229 {
 230         global_metrics.remove("input_underestimated_jitter_frames", labels);
 231         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 232 }
 233
 234 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 235 {
 236         if (expected_timestamp > steady_clock::time_point::min()) {
 237                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 238                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 239                 history.push_back(orders.insert(jitter_seconds));
 240                 if (jitter_seconds > estimate_max_jitter()) {
 241                         ++metric_input_underestimated_jitter_frames;
 242                 }
 243
 244                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 245
 246                 if (history.size() > history_length) {
 247                         orders.erase(history.front());
 248                         history.pop_front();
 249                 }
 250                 assert(history.size() <= history_length);
 251         }
 252         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 253 }
 254
 255 double JitterHistory::estimate_max_jitter() const
 256 {
 257         if (orders.empty()) {
 258                 return 0.0;
 259         }
 260         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 261         if (percentile <= 0.5) {
 262                 return *next(orders.begin(), elem_idx) * multiplier;
 263         } else {
 264                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 265         }
 266 }
 267
 268 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 269 {
 270         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 271 }
 272
 273 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 274 {
 275         global_metrics.remove("input_queue_safe_length_frames", labels);
 276 }
 277
 278 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 279                                       steady_clock::time_point expected_next_frame,
 280                                       int64_t input_frame_duration,
 281                                       int64_t master_frame_duration,
 282                                       double max_input_card_jitter_seconds,
 283                                       double max_master_card_jitter_seconds)
 284 {
 285         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 286         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 287
 288         // Figure out when we can expect the next frame for this card, assuming
 289         // worst-case jitter (ie., the frame is maximally late).
 290         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 291
 292         // How many times are the master card expected to tick in that time?
 293         // We assume the master clock has worst-case jitter but not any rate
 294         // discrepancy, ie., it ticks as early as possible every time, but not
 295         // cumulatively.
 296         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 297
 298         // As a special case, if the master card ticks faster than the input card,
 299         // we expect the queue to drain by itself even without dropping. But if
 300         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 301         // go slowly enough that the effect wouldn't really be appreciable.
 302         // We account for this by looking at the situation five frames ahead,
 303         // assuming everything else is the same.
 304         double frames_allowed;
 305         if (master_frame_duration < input_frame_duration) {
 306                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 307         } else {
 308                 frames_allowed = frames_needed;
 309         }
 310
 311         safe_queue_length = max<int>(floor(frames_allowed), 0);
 312         metric_input_queue_safe_length_frames = safe_queue_length;
 313 }
 314
 315 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 316         : httpd(),
 317           num_cards(num_cards),
 318           mixer_surface(create_surface(format)),
 319           h264_encoder_surface(create_surface(format)),
 320           decklink_output_surface(create_surface(format)),
 321           image_update_surface(create_surface(format))
 322 {
 323         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 324         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 325         check_error();
 326
 327         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 328             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 329                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 330                 exit(1);
 331         }
 332
 333         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 334         // will be halved when sampling them, and we need to compensate here.
 335         movit_texel_subpixel_precision /= 2.0;
 336
 337         resource_pool.reset(new ResourcePool);
 338         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 339                 output_channel[i].parent = this;
 340                 output_channel[i].channel = i;
 341         }
 342
 343         ImageFormat inout_format;
 344         inout_format.color_space = COLORSPACE_sRGB;
 345         inout_format.gamma_curve = GAMMA_sRGB;
 346
 347         // Matches the 4:2:0 format created by the main chain.
 348         YCbCrFormat ycbcr_format;
 349         ycbcr_format.chroma_subsampling_x = 2;
 350         ycbcr_format.chroma_subsampling_y = 2;
 351         if (global_flags.ycbcr_rec709_coefficients) {
 352                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 353         } else {
 354                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 355         }
 356         ycbcr_format.full_range = false;
 357         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 358         ycbcr_format.cb_x_position = 0.0f;
 359         ycbcr_format.cr_x_position = 0.0f;
 360         ycbcr_format.cb_y_position = 0.5f;
 361         ycbcr_format.cr_y_position = 0.5f;
 362
 363         // Initialize the neutral colors to sane values.
 364         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 365                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 366         }
 367
 368         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 369         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 370         check_error();
 371         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 372         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 373         display_chain->add_input(display_input);
 374         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 375         display_chain->set_dither_bits(0);  // Don't bother.
 376         display_chain->finalize();
 377
 378         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));
 379         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 380                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 381         }
 382
 383         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 384         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 385
 386         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 387         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 388         audio_mixer.reset(new AudioMixer(num_cards, video_inputs.size()));
 389
 390         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 391         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 392                 char url[256];
 393                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 394                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 395         }
 396
 397         // Start listening for clients only once VideoEncoder has written its header, if any.
 398         httpd.start(global_flags.http_port);
 399
 400         // First try initializing the then PCI devices, then USB, then
 401         // fill up with fake cards until we have the desired number of cards.
 402         unsigned num_pci_devices = 0;
 403         unsigned card_index = 0;
 404
 405         {
 406                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 407                 if (decklink_iterator != nullptr) {
 408                         for ( ; card_index < num_cards; ++card_index) {
 409                                 IDeckLink *decklink;
 410                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 411                                         break;
 412                                 }
 413
 414                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 415                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 416                                 if (!output->set_device(decklink)) {
 417                                         delete output;
 418                                         output = nullptr;
 419                                 }
 420                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 421                                 ++num_pci_devices;
 422                         }
 423                         decklink_iterator->Release();
 424                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 425                 } else {
 426                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 427                 }
 428         }
 429
 430         unsigned num_usb_devices = BMUSBCapture::num_cards();
 431         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 432                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 433                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 434                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 435         }
 436         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 437
 438         unsigned num_fake_cards = 0;
 439         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 440                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 441                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 442         }
 443
 444         if (num_fake_cards > 0) {
 445                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 446         }
 447
 448         // Initialize all video inputs the theme asked for. Note that these are
 449         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 450         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 451                 if (card_index >= MAX_VIDEO_CARDS) {
 452                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 453                         abort();
 454                 }
 455                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 456                 video_inputs[video_card_index]->set_card_index(card_index);
 457         }
 458         num_video_inputs = video_inputs.size();
 459
 460 #ifdef HAVE_CEF
 461         // Same, for HTML inputs.
 462         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 463         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 464                 if (card_index >= MAX_VIDEO_CARDS) {
 465                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 466                         abort();
 467                 }
 468                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
 469                 html_inputs[html_card_index]->set_card_index(card_index);
 470         }
 471         num_html_inputs = html_inputs.size();
 472 #endif
 473
 474         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 475         BMUSBCapture::start_bm_thread();
 476
 477 #ifdef HAVE_SRT
 478         if (global_flags.srt_port >= 0) {
 479                 start_srt();
 480         }
 481 #endif
 482
 483         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 484                 cards[card_index].queue_length_policy.reset(card_index);
 485         }
 486
 487         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 488
 489         if (global_flags.ten_bit_input) {
 490                 if (!v210Converter::has_hardware_support()) {
 491                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 492                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 493                         abort();
 494                 }
 495                 v210_converter.reset(new v210Converter());
 496
 497                 // These are all the widths listed in the Blackmagic SDK documentation
 498                 // (section 2.7.3, “Display Modes”).
 499                 v210_converter->precompile_shader(720);
 500                 v210_converter->precompile_shader(1280);
 501                 v210_converter->precompile_shader(1920);
 502                 v210_converter->precompile_shader(2048);
 503                 v210_converter->precompile_shader(3840);
 504                 v210_converter->precompile_shader(4096);
 505         }
 506         if (global_flags.ten_bit_output) {
 507                 if (!v210Converter::has_hardware_support()) {
 508                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 509                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 510                         abort();
 511                 }
 512         }
 513
 514         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 515         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 516         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 517
 518         if (global_flags.enable_alsa_output) {
 519                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 520         }
 521         if (global_flags.output_card != -1) {
 522                 desired_output_card_index = global_flags.output_card;
 523                 set_output_card_internal(global_flags.output_card);
 524         }
 525
 526         output_jitter_history.register_metrics({{ "card", "output" }});
 527
 528         ImageInput::start_update_thread(image_update_surface);
 529 }
 530
 531 Mixer::~Mixer()
 532 {
 533         ImageInput::end_update_thread();
 534
 535         if (mjpeg_encoder != nullptr) {
 536                 mjpeg_encoder->stop();
 537         }
 538         httpd.stop();
 539         BMUSBCapture::stop_bm_thread();
 540
 541         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 542                 cards[card_index].capture->stop_dequeue_thread();
 543                 if (cards[card_index].output) {
 544                         cards[card_index].output->end_output();
 545                         cards[card_index].output.reset();
 546                 }
 547         }
 548
 549         video_encoder.reset(nullptr);
 550 }
 551
 552 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 553 {
 554         printf("Configuring card %d...\n", card_index);
 555
 556         CaptureCard *card = &cards[card_index];
 557         if (card->capture != nullptr) {
 558                 card->capture->stop_dequeue_thread();
 559         }
 560         card->capture.reset(capture);
 561         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 562         if (card->is_fake_capture) {
 563                 card->fake_capture_counter = fake_capture_counter++;
 564         }
 565         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 566         card->may_have_dropped_last_frame = false;
 567         card->type = card_type;
 568         if (card->output.get() != output) {
 569                 card->output.reset(output);
 570         }
 571
 572         PixelFormat pixel_format;
 573         if (card_type == CardType::FFMPEG_INPUT) {
 574                 pixel_format = capture->get_current_pixel_format();
 575         } else if (card_type == CardType::CEF_INPUT) {
 576                 pixel_format = PixelFormat_8BitBGRA;
 577         } else if (global_flags.ten_bit_input) {
 578                 pixel_format = PixelFormat_10BitYCbCr;
 579         } else {
 580                 pixel_format = PixelFormat_8BitYCbCr;
 581         }
 582
 583         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 584         if (card->frame_allocator == nullptr) {
 585                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 586         } else {
 587                 // The format could have changed, but we cannot reset the allocator
 588                 // and create a new one from scratch, since there may be allocated
 589                 // frames from it that expect to call release_frame() on it.
 590                 // Instead, ask the allocator to create new frames for us and discard
 591                 // any old ones as they come back. This takes the mutex while
 592                 // allocating, but nothing should really be sending frames in there
 593                 // right now anyway (start_bm_capture() has not been called yet).
 594                 card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 595         }
 596         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 597         if (card->surface == nullptr) {
 598                 card->surface = create_surface_with_same_format(mixer_surface);
 599         }
 600         while (!card->new_frames.empty()) card->new_frames.pop_front();
 601         card->last_timecode = -1;
 602         card->capture->set_pixel_format(pixel_format);
 603         card->capture->configure_card();
 604
 605         // NOTE: start_bm_capture() happens in thread_func().
 606
 607         if (is_srt_card) {
 608                 assert(card_type == CardType::FFMPEG_INPUT);
 609         }
 610
 611         DeviceSpec device;
 612         if (card_type == CardType::FFMPEG_INPUT && !is_srt_card) {
 613                 device = DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 614         } else {
 615                 device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 616         }
 617         audio_mixer->reset_resampler(device);
 618         audio_mixer->set_display_name(device, card->capture->get_description());
 619         audio_mixer->trigger_state_changed_callback();
 620
 621         // Unregister old metrics, if any.
 622         if (!card->labels.empty()) {
 623                 const vector<pair<string, string>> &labels = card->labels;
 624                 card->jitter_history.unregister_metrics(labels);
 625                 card->queue_length_policy.unregister_metrics(labels);
 626                 global_metrics.remove_if_exists("input_received_frames", labels);
 627                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 628                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 629                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 630                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 631                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 632
 633                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 634                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 635                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 636                 global_metrics.remove_if_exists("input_width_pixels", labels);
 637                 global_metrics.remove_if_exists("input_height_pixels", labels);
 638                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 639                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 640                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 641
 642                 // SRT metrics.
 643
 644                 // Global measurements (counters).
 645                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 646                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 647                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 648                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 649
 650                 vector<pair<string, string>> packet_labels = card->labels;
 651                 packet_labels.emplace_back("type", "normal");
 652                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 653                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 654
 655                 packet_labels.back().second = "lost";
 656                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 657                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 658
 659                 packet_labels.back().second = "retransmitted";
 660                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 661                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 662
 663                 packet_labels.back().second = "ack";
 664                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 665                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 666
 667                 packet_labels.back().second = "nak";
 668                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 669                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 670
 671                 packet_labels.back().second = "dropped";
 672                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 673                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 674                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 675                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 676
 677                 packet_labels.back().second = "undecryptable";
 678                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 679                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 680
 681                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 682                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 683                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 684                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 685
 686                 // Instant measurements (gauges).
 687                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 688                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 689                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 690                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 691                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 692                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 693                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 694                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 695                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 696                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 697
 698                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 699                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 700                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 701                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 702
 703                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 704                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 705                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 706                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 707         }
 708
 709         // Register metrics.
 710         vector<pair<string, string>> labels;
 711         char card_name[64];
 712         snprintf(card_name, sizeof(card_name), "%d", card_index);
 713         labels.emplace_back("card", card_name);
 714
 715         switch (card_type) {
 716         case CardType::LIVE_CARD:
 717                 labels.emplace_back("cardtype", "live");
 718                 break;
 719         case CardType::FAKE_CAPTURE:
 720                 labels.emplace_back("cardtype", "fake");
 721                 break;
 722         case CardType::FFMPEG_INPUT:
 723                 if (is_srt_card) {
 724                         labels.emplace_back("cardtype", "srt");
 725                 } else {
 726                         labels.emplace_back("cardtype", "ffmpeg");
 727                 }
 728                 break;
 729         case CardType::CEF_INPUT:
 730                 labels.emplace_back("cardtype", "cef");
 731                 break;
 732         default:
 733                 assert(false);
 734         }
 735         card->jitter_history.register_metrics(labels);
 736         card->queue_length_policy.register_metrics(labels);
 737         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 738         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 739         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 740         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 741         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 742         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 743
 744         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 745         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 746         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 747         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 748         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 749         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 750         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 751         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 752
 753         if (is_srt_card) {
 754                 // Global measurements (counters).
 755                 global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 756                 global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 757                 global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 758                 global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 759
 760                 vector<pair<string, string>> packet_labels = labels;
 761                 packet_labels.emplace_back("type", "normal");
 762                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 763                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 764
 765                 packet_labels.back().second = "lost";
 766                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 767                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 768
 769                 packet_labels.back().second = "retransmitted";
 770                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 771                 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 772
 773                 packet_labels.back().second = "ack";
 774                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 775                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 776
 777                 packet_labels.back().second = "nak";
 778                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 779                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 780
 781                 packet_labels.back().second = "dropped";
 782                 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 783                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 784                 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 785                 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 786
 787                 packet_labels.back().second = "undecryptable";
 788                 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 789                 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 790
 791                 global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 792                 global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 793                 global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 794                 global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 795
 796                 // Instant measurements (gauges).
 797                 global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 798                 global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 799                 global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 800                 global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 801                 global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 802                 global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 803                 global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 804                 global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 805                 global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 806                 global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 807
 808                 global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 809                 global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 810                 global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 811                 global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 812
 813                 global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 814                 global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 815                 global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 816                 global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 817         }
 818
 819         card->labels = labels;
 820 }
 821
 822 void Mixer::set_output_card_internal(int card_index)
 823 {
 824         // We don't really need to take card_mutex, since we're in the mixer
 825         // thread and don't mess with any queues (which is the only thing that happens
 826         // from other threads), but it's probably the safest in the long run.
 827         unique_lock<mutex> lock(card_mutex);
 828         if (output_card_index != -1) {
 829                 // Switch the old card from output to input.
 830                 CaptureCard *old_card = &cards[output_card_index];
 831                 old_card->output->end_output();
 832
 833                 // Stop the fake card that we put into place.
 834                 // This needs to _not_ happen under the mutex, to avoid deadlock
 835                 // (delivering the last frame needs to take the mutex).
 836                 CaptureInterface *fake_capture = old_card->capture.get();
 837                 lock.unlock();
 838                 fake_capture->stop_dequeue_thread();
 839                 lock.lock();
 840                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 841                 old_card->is_fake_capture = false;
 842                 old_card->capture->start_bm_capture();
 843         }
 844         if (card_index != -1) {
 845                 CaptureCard *card = &cards[card_index];
 846                 CaptureInterface *capture = card->capture.get();
 847                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 848                 // several seconds to complete (blocking on DisableVideoInput);
 849                 // see if we can maybe do it asynchronously.
 850                 lock.unlock();
 851                 capture->stop_dequeue_thread();
 852                 lock.lock();
 853                 card->parked_capture = move(card->capture);
 854                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 855                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 856                 card->queue_length_policy.reset(card_index);
 857                 card->capture->start_bm_capture();
 858                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 859                 card->output->start_output(desired_output_video_mode, pts_int);
 860         }
 861         output_card_index = card_index;
 862         output_jitter_history.clear();
 863 }
 864
 865 namespace {
 866
 867 int unwrap_timecode(uint16_t current_wrapped, int last)
 868 {
 869         uint16_t last_wrapped = last & 0xffff;
 870         if (current_wrapped > last_wrapped) {
 871                 return (last & ~0xffff) | current_wrapped;
 872         } else {
 873                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 874         }
 875 }
 876
 877 DeviceSpec card_index_to_device(unsigned card_index, unsigned num_cards)
 878 {
 879         if (card_index >= num_cards) {
 880                 return DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 881         } else {
 882                 return DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 883         }
 884 }
 885
 886 }  // namespace
 887
 888 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 889                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 890                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 891 {
 892         DeviceSpec device = card_index_to_device(card_index, num_cards);
 893         CaptureCard *card = &cards[card_index];
 894
 895         ++card->metric_input_received_frames;
 896         card->metric_input_has_signal_bool = video_format.has_signal;
 897         card->metric_input_is_connected_bool = video_format.is_connected;
 898         card->metric_input_interlaced_bool = video_format.interlaced;
 899         card->metric_input_width_pixels = video_format.width;
 900         card->metric_input_height_pixels = video_format.height;
 901         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 902         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 903         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 904
 905         if (is_mode_scanning[card_index]) {
 906                 if (video_format.has_signal) {
 907                         // Found a stable signal, so stop scanning.
 908                         is_mode_scanning[card_index] = false;
 909                 } else {
 910                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 911                         steady_clock::time_point now = steady_clock::now();
 912                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 913                         if (sec_since_last_switch > switch_time_s) {
 914                                 // It isn't this mode; try the next one.
 915                                 mode_scanlist_index[card_index]++;
 916                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 917                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 918                                 last_mode_scan_change[card_index] = now;
 919                         }
 920                 }
 921         }
 922
 923         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 924         assert(frame_length > 0);
 925
 926         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;
 927         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 928                 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",
 929                         spec_to_string(device).c_str(), int(audio_frame.len), int(audio_offset),
 930                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 931                 if (video_frame.owner) {
 932                         video_frame.owner->release_frame(video_frame);
 933                 }
 934                 if (audio_frame.owner) {
 935                         audio_frame.owner->release_frame(audio_frame);
 936                 }
 937                 return;
 938         }
 939
 940         int dropped_frames = 0;
 941         if (card->last_timecode != -1) {
 942                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 943         }
 944
 945         // Number of samples per frame if we need to insert silence.
 946         // (Could be nonintegral, but resampling will save us then.)
 947         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 948
 949         if (dropped_frames > MAX_FPS * 2) {
 950                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 951                         spec_to_string(device).c_str(), card->last_timecode, timecode);
 952                 audio_mixer->reset_resampler(device);
 953                 dropped_frames = 0;
 954                 ++card->metric_input_resets;
 955         } else if (dropped_frames > 0) {
 956                 // Insert silence as needed.
 957                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 958                         spec_to_string(device).c_str(), dropped_frames, timecode);
 959                 card->metric_input_dropped_frames_error += dropped_frames;
 960
 961                 bool success;
 962                 do {
 963                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 964                 } while (!success);
 965         }
 966
 967         if (num_samples > 0) {
 968                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
 969
 970                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
 971                 // just gets dropped for now.
 972                 //
 973                 // Only bother doing MJPEG encoding if there are any connected clients
 974                 // that want the stream.
 975                 if (httpd.get_num_connected_multicam_clients() > 0 ||
 976                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
 977                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
 978                         lock_guard<mutex> lock(card_mutex);
 979                         if (card->new_raw_audio.empty()) {
 980                                 card->new_raw_audio = move(converted_samples);
 981                         } else {
 982                                 // For raw audio, we don't really synchronize audio and video;
 983                                 // we just put the audio in frame by frame, and if a video frame is
 984                                 // dropped, we still keep the audio, which means it will be added
 985                                 // to the beginning of the next frame. It would probably be better
 986                                 // to move the audio pts earlier to show this, but most players can
 987                                 // live with some jitter, and in a lot of ways, it's much nicer for
 988                                 // Futatabi to have all audio locked to a video frame.
 989                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
 990
 991                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
 992                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
 993                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
 994                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
 995                                 }
 996                         }
 997                 }
 998         }
 999
1000         // Done with the audio, so release it.
1001         if (audio_frame.owner) {
1002                 audio_frame.owner->release_frame(audio_frame);
1003         }
1004
1005         card->last_timecode = timecode;
1006
1007         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1008         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1009                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1010                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1011                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1012         }
1013 #ifdef HAVE_SRT
1014         if (card->type == CardType::FFMPEG_INPUT) {
1015                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1016                 if (srt_sock != -1) {
1017                         update_srt_stats(srt_sock, card);
1018                 }
1019         }
1020 #endif
1021
1022         size_t y_offset, cbcr_offset;
1023         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1024         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1025                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1026                 assert(card->type == CardType::FFMPEG_INPUT);
1027                 assert(video_offset == 0);
1028                 expected_length = video_frame.len;
1029
1030                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1031                 y_offset = 0;
1032                 cbcr_offset = video_format.width * video_format.height;
1033         } else {
1034                 // All the other Y'CbCr formats are 4:2:2.
1035                 y_offset = video_frame.size / 2 + video_offset / 2;
1036                 cbcr_offset = video_offset / 2;
1037         }
1038         if (video_frame.len - video_offset == 0 ||
1039             video_frame.len - video_offset != expected_length) {
1040                 if (video_frame.len != 0) {
1041                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1042                                 spec_to_string(device).c_str(), video_frame.len - video_offset, expected_length);
1043                 }
1044                 if (video_frame.owner) {
1045                         video_frame.owner->release_frame(video_frame);
1046                 }
1047
1048                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1049                 // so that pts can go up accordingly.
1050                 {
1051                         lock_guard<mutex> lock(card_mutex);
1052                         CaptureCard::NewFrame new_frame;
1053                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1054                         new_frame.length = frame_length;
1055                         new_frame.interlaced = false;
1056                         new_frame.dropped_frames = dropped_frames;
1057                         new_frame.received_timestamp = video_frame.received_timestamp;
1058                         card->new_frames.push_back(move(new_frame));
1059                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1060                 }
1061                 card->new_frames_changed.notify_all();
1062                 return;
1063         }
1064
1065         unsigned num_fields = video_format.interlaced ? 2 : 1;
1066         steady_clock::time_point frame_upload_start;
1067         if (video_format.interlaced) {
1068                 // Send the two fields along as separate frames; the other side will need to add
1069                 // a deinterlacer to actually get this right.
1070                 assert(video_format.height % 2 == 0);
1071                 video_format.height /= 2;
1072                 assert(frame_length % 2 == 0);
1073                 frame_length /= 2;
1074                 num_fields = 2;
1075                 frame_upload_start = steady_clock::now();
1076         }
1077         assert(userdata != nullptr);
1078         userdata->last_interlaced = video_format.interlaced;
1079         userdata->last_has_signal = video_format.has_signal;
1080         userdata->last_is_connected = video_format.is_connected;
1081         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1082         userdata->last_frame_rate_den = video_format.frame_rate_den;
1083         RefCountedFrame frame(video_frame);
1084
1085         // Send the frames on to the main thread, which will upload and process htem.
1086         // It is entirely possible to upload them in the same thread (and it might even be
1087         // faster, depending on the GPU and driver), but it appears to be trickling
1088         // driver bugs very easily.
1089         //
1090         // Note that this means we must hold on to the actual frame data in <userdata>
1091         // until the upload is done, but we hold on to <frame> much longer than that
1092         // (in fact, all the way until we no longer use the texture in rendering).
1093         for (unsigned field = 0; field < num_fields; ++field) {
1094                 if (field == 1) {
1095                         // Don't upload the second field as fast as we can; wait until
1096                         // the field time has approximately passed. (Otherwise, we could
1097                         // get timing jitter against the other sources, and possibly also
1098                         // against the video display, although the latter is not as critical.)
1099                         // This requires our system clock to be reasonably close to the
1100                         // video clock, but that's not an unreasonable assumption.
1101                         steady_clock::time_point second_field_start = frame_upload_start +
1102                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1103                         this_thread::sleep_until(second_field_start);
1104                 }
1105
1106                 {
1107                         lock_guard<mutex> lock(card_mutex);
1108                         CaptureCard::NewFrame new_frame;
1109                         new_frame.frame = frame;
1110                         new_frame.length = frame_length;
1111                         new_frame.field = field;
1112                         new_frame.interlaced = video_format.interlaced;
1113                         new_frame.dropped_frames = dropped_frames;
1114                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1115                         new_frame.video_format = video_format;
1116                         new_frame.video_offset = video_offset;
1117                         new_frame.y_offset = y_offset;
1118                         new_frame.cbcr_offset = cbcr_offset;
1119                         new_frame.texture_uploaded = false;
1120                         if (card->type == CardType::FFMPEG_INPUT) {
1121                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1122                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1123                         }
1124                         card->new_frames.push_back(move(new_frame));
1125                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1126                         card->may_have_dropped_last_frame = false;
1127                 }
1128                 card->new_frames_changed.notify_all();
1129         }
1130 }
1131
1132 void Mixer::upload_texture_for_frame(
1133         int field, bmusb::VideoFormat video_format,
1134         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1135 {
1136         size_t cbcr_width, cbcr_height;
1137         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1138                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1139                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1140         } else {
1141                 // All the other Y'CbCr formats are 4:2:2.
1142                 cbcr_width = video_format.width / 2;
1143                 cbcr_height = video_format.height;
1144         }
1145
1146         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1147         if (video_format.interlaced) {
1148                 cbcr_height /= 2;
1149         }
1150
1151         unsigned field_start_line;
1152         if (field == 1) {
1153                 field_start_line = video_format.second_field_start;
1154         } else {
1155                 field_start_line = video_format.extra_lines_top;
1156         }
1157
1158         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1159         size_t v210_width = video_format.stride / sizeof(uint32_t);
1160         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1161
1162         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1163         check_error();
1164
1165         switch (userdata->pixel_format) {
1166                 case PixelFormat_10BitYCbCr: {
1167                         size_t field_start = video_offset + video_format.stride * field_start_line;
1168                         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);
1169                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1170                         break;
1171                 }
1172                 case PixelFormat_8BitYCbCr: {
1173                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1174                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1175
1176                         // Make up our own strides, since we are interleaving.
1177                         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);
1178                         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);
1179                         break;
1180                 }
1181                 case PixelFormat_8BitYCbCrPlanar: {
1182                         assert(field_start_line == 0);  // We don't really support interlaced here.
1183                         size_t field_y_start = y_offset;
1184                         size_t field_cb_start = cbcr_offset;
1185                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1186
1187                         // Make up our own strides, since we are interleaving.
1188                         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);
1189                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1190                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1191                         break;
1192                 }
1193                 case PixelFormat_8BitBGRA: {
1194                         size_t field_start = video_offset + video_format.stride * field_start_line;
1195                         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);
1196                         // These could be asked to deliver mipmaps at any time.
1197                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1198                         check_error();
1199                         glGenerateMipmap(GL_TEXTURE_2D);
1200                         check_error();
1201                         glBindTexture(GL_TEXTURE_2D, 0);
1202                         check_error();
1203                         break;
1204                 }
1205                 default:
1206                         assert(false);
1207         }
1208
1209         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1210         check_error();
1211 }
1212
1213 void Mixer::bm_hotplug_add(libusb_device *dev)
1214 {
1215         lock_guard<mutex> lock(hotplug_mutex);
1216         hotplugged_cards.push_back(dev);
1217 }
1218
1219 void Mixer::bm_hotplug_remove(unsigned card_index)
1220 {
1221         cards[card_index].new_frames_changed.notify_all();
1222 }
1223
1224 void Mixer::thread_func()
1225 {
1226         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1227
1228         eglBindAPI(EGL_OPENGL_API);
1229         QOpenGLContext *context = create_context(mixer_surface);
1230         if (!make_current(context, mixer_surface)) {
1231                 printf("oops\n");
1232                 abort();
1233         }
1234
1235         // Start the actual capture. (We don't want to do it before we're actually ready
1236         // to process output frames.)
1237         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1238                 if (int(card_index) != output_card_index) {
1239                         cards[card_index].capture->start_bm_capture();
1240                 }
1241         }
1242
1243         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1244         int stats_dropped_frames = 0;
1245
1246         while (!should_quit) {
1247                 if (desired_output_card_index != output_card_index) {
1248                         set_output_card_internal(desired_output_card_index);
1249                 }
1250                 if (output_card_index != -1 &&
1251                     desired_output_video_mode != output_video_mode) {
1252                         DeckLinkOutput *output = cards[output_card_index].output.get();
1253                         output->end_output();
1254                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1255                         output->start_output(desired_output_video_mode, pts_int);
1256                 }
1257
1258                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1259                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1260
1261                 bool master_card_is_output;
1262                 unsigned master_card_index;
1263                 if (output_card_index != -1) {
1264                         master_card_is_output = true;
1265                         master_card_index = output_card_index;
1266                 } else {
1267                         master_card_is_output = false;
1268                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1269                         assert(master_card_index < num_cards + num_video_inputs);
1270                 }
1271
1272                 handle_hotplugged_cards();
1273
1274                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1275                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1276                 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);
1277                 stats_dropped_frames += output_frame_info.dropped_frames;
1278
1279                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1280                         DeviceSpec device = card_index_to_device(card_index, num_cards);
1281                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1282                                 continue;
1283                         }
1284                         if (new_frames[card_index].frame->len == 0) {
1285                                 ++new_frames[card_index].dropped_frames;
1286                         }
1287                         if (new_frames[card_index].dropped_frames > 0) {
1288                                 printf("%s dropped %d frames before this\n",
1289                                         spec_to_string(device).c_str(), int(new_frames[card_index].dropped_frames));
1290                         }
1291                 }
1292
1293                 // If the first card is reporting a corrupted or otherwise dropped frame,
1294                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1295                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1296                         ++stats_dropped_frames;
1297                         pts_int += new_frames[master_card_index].length;
1298                         continue;
1299                 }
1300
1301                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1302                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1303                                 continue;
1304
1305                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1306                         assert(new_frame->frame != nullptr);
1307                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1308                         check_error();
1309
1310                         // The new texture might need uploading before use.
1311                         if (!new_frame->texture_uploaded) {
1312                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1313                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1314                                 new_frame->texture_uploaded = true;
1315                         }
1316
1317                         // Only set the white balance if it actually changed. This means that the user
1318                         // is free to override the white balance in a video with no white balance information
1319                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1320                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1321                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1322                         // that the change takes effect on exactly the right frame.
1323                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1324                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1325                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1326                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1327                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1328                         }
1329
1330                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1331                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1332                                 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);
1333                         }
1334
1335                 }
1336
1337                 int64_t frame_duration = output_frame_info.frame_duration;
1338                 render_one_frame(frame_duration);
1339                 {
1340                         lock_guard<mutex> lock(frame_num_mutex);
1341                         ++frame_num;
1342                 }
1343                 frame_num_updated.notify_all();
1344                 pts_int += frame_duration;
1345
1346                 basic_stats.update(frame_num, stats_dropped_frames);
1347                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1348
1349                 if (should_cut.exchange(false)) {  // Test and clear.
1350                         video_encoder->do_cut(frame_num);
1351                 }
1352
1353 #if 0
1354                 // Reset every 100 frames, so that local variations in frame times
1355                 // (especially for the first few frames, when the shaders are
1356                 // compiled etc.) don't make it hard to measure for the entire
1357                 // remaining duration of the program.
1358                 if (frame == 10000) {
1359                         frame = 0;
1360                         start = now;
1361                 }
1362 #endif
1363                 check_error();
1364         }
1365
1366         resource_pool->clean_context();
1367 }
1368
1369 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1370 {
1371         if (output_card_index != -1) {
1372                 // The output card (ie., cards[output_card_index].output) is the master clock,
1373                 // so no input card (ie., cards[card_index].capture) is.
1374                 return false;
1375         }
1376         return (card_index == master_card_index);
1377 }
1378
1379 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1380 {
1381         // Count the number of frames in the queue, including any frames
1382         // we dropped. It's hard to know exactly how we should deal with
1383         // dropped (corrupted) input frames; they don't help our goal of
1384         // avoiding starvation, but they still add to the problem of latency.
1385         // Since dropped frames is going to mean a bump in the signal anyway,
1386         // we err on the side of having more stable latency instead.
1387         unsigned queue_length = 0;
1388         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1389                 queue_length += frame.dropped_frames + 1;
1390         }
1391
1392         // If needed, drop frames until the queue is below the safe limit.
1393         // We prefer to drop from the head, because all else being equal,
1394         // we'd like more recent frames (less latency).
1395         unsigned dropped_frames = 0;
1396         while (queue_length > safe_queue_length) {
1397                 assert(!card->new_frames.empty());
1398                 assert(queue_length > card->new_frames.front().dropped_frames);
1399                 queue_length -= card->new_frames.front().dropped_frames;
1400
1401                 if (queue_length <= safe_queue_length) {
1402                         // No need to drop anything.
1403                         break;
1404                 }
1405
1406                 card->new_frames.pop_front();
1407                 card->new_frames_changed.notify_all();
1408                 --queue_length;
1409                 ++dropped_frames;
1410
1411                 if (queue_length == 0 && card->is_cef_capture) {
1412                         card->may_have_dropped_last_frame = true;
1413                 }
1414         }
1415
1416         card->metric_input_dropped_frames_jitter += dropped_frames;
1417         card->metric_input_queue_length_frames = queue_length;
1418
1419 #if 0
1420         if (dropped_frames > 0) {
1421                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1422                         card_index, dropped_frames);
1423         }
1424 #endif
1425 }
1426
1427 pair<string, string> Mixer::get_channels_json()
1428 {
1429         Channels ret;
1430         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1431                 Channel *channel = ret.add_channel();
1432                 channel->set_index(channel_idx + 2);
1433                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1434                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1435         }
1436         string contents;
1437         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1438         return make_pair(contents, "text/json");
1439 }
1440
1441 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1442 {
1443         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1444 }
1445
1446 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])
1447 {
1448         OutputFrameInfo output_frame_info;
1449 start:
1450         unique_lock<mutex> lock(card_mutex, defer_lock);
1451         if (master_card_is_output) {
1452                 // Clocked to the output, so wait for it to be ready for the next frame.
1453                 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);
1454                 lock.lock();
1455         } else {
1456                 // Wait for the master card to have a new frame.
1457                 // TODO: Add a timeout.
1458                 output_frame_info.is_preroll = false;
1459                 lock.lock();
1460                 cards[master_card_index].new_frames_changed.wait(lock, [this, master_card_index]{ return !cards[master_card_index].new_frames.empty() || cards[master_card_index].capture->get_disconnected(); });
1461         }
1462
1463         if (master_card_is_output) {
1464                 handle_hotplugged_cards();
1465         } else if (cards[master_card_index].new_frames.empty()) {
1466                 // We were woken up, but not due to a new frame. Deal with it
1467                 // and then restart.
1468                 assert(cards[master_card_index].capture->get_disconnected());
1469                 handle_hotplugged_cards();
1470                 lock.unlock();
1471                 goto start;
1472         }
1473
1474         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1475                 CaptureCard *card = &cards[card_index];
1476                 if (card->new_frames.empty()) {  // Starvation.
1477                         ++card->metric_input_duped_frames;
1478 #ifdef HAVE_CEF
1479                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1480                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1481                                 // stream of frames, so we'll have to ask it to repaint the frame
1482                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1483                                 // trim the queue completely away, and cleared when we actually
1484                                 // get a new frame.)
1485                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1486                         }
1487 #endif
1488                 } else {
1489                         new_frames[card_index] = move(card->new_frames.front());
1490                         has_new_frame[card_index] = true;
1491                         card->new_frames.pop_front();
1492                         card->new_frames_changed.notify_all();
1493                 }
1494
1495                 raw_audio[card_index] = move(card->new_raw_audio);
1496         }
1497
1498         if (!master_card_is_output) {
1499                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1500                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1501                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1502         }
1503
1504         if (!output_frame_info.is_preroll) {
1505                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1506         }
1507
1508         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1509                 CaptureCard *card = &cards[card_index];
1510                 if (has_new_frame[card_index] &&
1511                     !input_card_is_master_clock(card_index, master_card_index) &&
1512                     !output_frame_info.is_preroll) {
1513                         card->queue_length_policy.update_policy(
1514                                 output_frame_info.frame_timestamp,
1515                                 card->jitter_history.get_expected_next_frame(),
1516                                 new_frames[master_card_index].length,
1517                                 output_frame_info.frame_duration,
1518                                 card->jitter_history.estimate_max_jitter(),
1519                                 output_jitter_history.estimate_max_jitter());
1520                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1521                                                   card->queue_length_policy.get_safe_queue_length()));
1522                 }
1523         }
1524
1525         // This might get off by a fractional sample when changing master card
1526         // between ones with different frame rates, but that's fine.
1527         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1528         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1529         fractional_samples = num_samples_times_timebase % TIMEBASE;
1530         assert(output_frame_info.num_samples >= 0);
1531
1532         return output_frame_info;
1533 }
1534
1535 void Mixer::handle_hotplugged_cards()
1536 {
1537         // Check for cards that have been disconnected since last frame.
1538         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1539                 CaptureCard *card = &cards[card_index];
1540                 if (card->capture->get_disconnected()) {
1541                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1542                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1543                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1544                         card->queue_length_policy.reset(card_index);
1545                         card->capture->start_bm_capture();
1546                 }
1547         }
1548
1549         // Check for cards that have been connected since last frame.
1550         vector<libusb_device *> hotplugged_cards_copy;
1551 #ifdef HAVE_SRT
1552         vector<int> hotplugged_srt_cards_copy;
1553 #endif
1554         {
1555                 lock_guard<mutex> lock(hotplug_mutex);
1556                 swap(hotplugged_cards, hotplugged_cards_copy);
1557 #ifdef HAVE_SRT
1558                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1559 #endif
1560         }
1561         for (libusb_device *new_dev : hotplugged_cards_copy) {
1562                 // Look for a fake capture card where we can stick this in.
1563                 int free_card_index = -1;
1564                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1565                         if (cards[card_index].is_fake_capture) {
1566                                 free_card_index = card_index;
1567                                 break;
1568                         }
1569                 }
1570
1571                 if (free_card_index == -1) {
1572                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1573                         libusb_unref_device(new_dev);
1574                 } else {
1575                         // BMUSBCapture takes ownership.
1576                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1577                         CaptureCard *card = &cards[free_card_index];
1578                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1579                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1580                         card->queue_length_policy.reset(free_card_index);
1581                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1582                         capture->start_bm_capture();
1583                 }
1584         }
1585
1586 #ifdef HAVE_SRT
1587         // Same, for SRT inputs.
1588         // TODO: On disconnect and reconnect, we might want to use the stream ID
1589         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1590                 char name[256];
1591                 int namelen = sizeof(name);
1592                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1593                 string stream_id(name, namelen);
1594
1595                 // Look for a fake capture card where we can stick this in.
1596                 // Prioritize ones that previously held SRT streams with the
1597                 // same stream ID, if any exist -- and it multiple exist,
1598                 // take the one that disconnected the last.
1599                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1600                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1601                         CaptureCard *card = &cards[card_index];
1602                         if (!card->is_fake_capture) {
1603                                 continue;
1604                         }
1605                         if (first_free_card_index == -1) {
1606                                 first_free_card_index = card_index;
1607                         }
1608                         if (card->last_srt_stream_id == stream_id &&
1609                             (last_matching_free_card_index == -1 ||
1610                              card->fake_capture_counter >
1611                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1612                                 last_matching_free_card_index = card_index;
1613                         }
1614                 }
1615
1616                 const int free_card_index = (last_matching_free_card_index != -1)
1617                         ? last_matching_free_card_index : first_free_card_index;
1618                 if (free_card_index == -1) {
1619                         if (stream_id.empty()) {
1620                                 stream_id = "no name";
1621                         }
1622                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1623                         srt_close(sock);
1624                 } else {
1625                         // FFmpegCapture takes ownership.
1626                         if (stream_id.empty()) {
1627                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1628                         } else {
1629                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1630                         }
1631                         CaptureCard *card = &cards[free_card_index];
1632                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1633                         capture->set_card_index(free_card_index);
1634                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*override_card_as_live=*/true);
1635                         update_srt_stats(sock, card);  // Initial zero stats.
1636                         card->last_srt_stream_id = stream_id;
1637                         card->queue_length_policy.reset(free_card_index);
1638                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1639                         capture->start_bm_capture();
1640                 }
1641         }
1642 #endif
1643 }
1644
1645
1646 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)
1647 {
1648         // Resample the audio as needed, including from previously dropped frames.
1649         assert(num_cards > 0);
1650         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1651                 const bool dropped_frame = (frame_num != dropped_frames);
1652                 {
1653                         // Signal to the audio thread to process this frame.
1654                         // Note that if the frame is a dropped frame, we signal that
1655                         // we don't want to use this frame as base for adjusting
1656                         // the resampler rate. The reason for this is that the timing
1657                         // of these frames is often way too late; they typically don't
1658                         // “arrive” before we synthesize them. Thus, we could end up
1659                         // in a situation where we have inserted e.g. five audio frames
1660                         // into the queue before we then start pulling five of them
1661                         // back out. This makes ResamplingQueue overestimate the delay,
1662                         // causing undue resampler changes. (We _do_ use the last,
1663                         // non-dropped frame; perhaps we should just discard that as well,
1664                         // since dropped frames are expected to be rare, and it might be
1665                         // better to just wait until we have a slightly more normal situation).
1666                         lock_guard<mutex> lock(audio_mutex);
1667                         bool adjust_rate = !dropped_frame && !is_preroll;
1668                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1669                         audio_task_queue_changed.notify_one();
1670                 }
1671                 if (dropped_frame) {
1672                         // For dropped frames, increase the pts. Note that if the format changed
1673                         // in the meantime, we have no way of detecting that; we just have to
1674                         // assume the frame length is always the same.
1675                         pts_int += length_per_frame;
1676                 }
1677         }
1678 }
1679
1680 void Mixer::render_one_frame(int64_t duration)
1681 {
1682         // Determine the time code for this frame before we start rendering.
1683         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1684         if (display_timecode_on_stdout) {
1685                 printf("Timecode: '%s'\n", timecode_text.c_str());
1686         }
1687
1688         // Update Y'CbCr settings for all cards.
1689         {
1690                 lock_guard<mutex> lock(card_mutex);
1691                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1692                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1693                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1694                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1695                         input_state.full_range[card_index] = interpretation->full_range;
1696                 }
1697         }
1698
1699         // Get the main chain from the theme, and set its state immediately.
1700         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1701         EffectChain *chain = theme_main_chain.chain;
1702         theme_main_chain.setup_chain();
1703         //theme_main_chain.chain->enable_phase_timing(true);
1704
1705         // If HDMI/SDI output is active and the user has requested auto mode,
1706         // its mode overrides the existing Y'CbCr setting for the chain.
1707         YCbCrLumaCoefficients ycbcr_output_coefficients;
1708         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1709                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1710         } else {
1711                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1712         }
1713
1714         // TODO: Reduce the duplication against theme.cpp.
1715         YCbCrFormat output_ycbcr_format;
1716         output_ycbcr_format.chroma_subsampling_x = 1;
1717         output_ycbcr_format.chroma_subsampling_y = 1;
1718         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1719         output_ycbcr_format.full_range = false;
1720         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1721         chain->change_ycbcr_output_format(output_ycbcr_format);
1722
1723         // Render main chain. If we're using zerocopy Quick Sync encoding
1724         // (the default case), we take an extra copy of the created outputs,
1725         // so that we can display it back to the screen later (it's less memory
1726         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1727         // Ideally, we'd like to avoid taking copies and just use the main textures
1728         // for display as well, but they're just views into VA-API memory and must be
1729         // unmapped during encoding, so we can't use them for display, unfortunately.
1730         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1731         GLuint y_copy_tex, cbcr_copy_tex = 0;
1732         GLuint y_display_tex, cbcr_display_tex;
1733         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1734         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1735         const bool is_zerocopy = video_encoder->is_zerocopy();
1736         if (is_zerocopy) {
1737                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1738                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1739                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1740
1741                 y_display_tex = y_copy_tex;
1742                 cbcr_display_tex = cbcr_copy_tex;
1743
1744                 // y_tex and cbcr_tex will be given by VideoEncoder.
1745         } else {
1746                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1747                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1748                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1749
1750                 y_display_tex = y_tex;
1751                 cbcr_display_tex = cbcr_tex;
1752         }
1753
1754         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1755         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1756         assert(got_frame);
1757
1758         GLuint fbo;
1759         if (is_zerocopy) {
1760                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1761         } else {
1762                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1763         }
1764         check_error();
1765         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1766
1767         if (display_timecode_in_stream) {
1768                 // Render the timecode on top.
1769                 timecode_renderer->render_timecode(fbo, timecode_text);
1770         }
1771
1772         resource_pool->release_fbo(fbo);
1773
1774         if (is_zerocopy) {
1775                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1776         } else {
1777                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1778         }
1779         if (output_card_index != -1) {
1780                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1781         }
1782         resource_pool->release_2d_texture(cbcr_full_tex);
1783
1784         // Set the right state for the Y' and CbCr textures we use for display.
1785         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1786         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1787         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1788         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1789         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1790
1791         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1792         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1793         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1794         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1795
1796         RefCountedGLsync fence = video_encoder->end_frame();
1797
1798         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1799         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1800         DisplayFrame live_frame;
1801         live_frame.chain = display_chain.get();
1802         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1803                 display_input->set_texture_num(0, y_display_tex);
1804                 display_input->set_texture_num(1, cbcr_display_tex);
1805         };
1806         live_frame.ready_fence = fence;
1807         live_frame.input_frames = {};
1808         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1809         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1810
1811         // Set up preview and any additional channels.
1812         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1813                 DisplayFrame display_frame;
1814                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1815                 display_frame.chain = move(chain.chain);
1816                 display_frame.setup_chain = move(chain.setup_chain);
1817                 display_frame.ready_fence = fence;
1818                 display_frame.input_frames = move(chain.input_frames);
1819                 display_frame.temp_textures = {};
1820                 output_channel[i].output_frame(move(display_frame));
1821         }
1822 }
1823
1824 void Mixer::audio_thread_func()
1825 {
1826         pthread_setname_np(pthread_self(), "Mixer_Audio");
1827
1828         while (!should_quit) {
1829                 AudioTask task;
1830
1831                 {
1832                         unique_lock<mutex> lock(audio_mutex);
1833                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1834                         if (should_quit) {
1835                                 return;
1836                         }
1837                         task = audio_task_queue.front();
1838                         audio_task_queue.pop();
1839                 }
1840
1841                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1842                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1843                 vector<float> samples_out = audio_mixer->get_output(
1844                         task.frame_timestamp,
1845                         task.num_samples,
1846                         rate_adjustment_policy);
1847
1848                 // Send the samples to the sound card, then add them to the output.
1849                 if (alsa) {
1850                         alsa->write(samples_out);
1851                 }
1852                 if (output_card_index != -1) {
1853                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1854                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1855                 }
1856                 video_encoder->add_audio(task.pts_int, move(samples_out));
1857         }
1858 }
1859
1860 void Mixer::release_display_frame(DisplayFrame *frame)
1861 {
1862         for (GLuint texnum : frame->temp_textures) {
1863                 resource_pool->release_2d_texture(texnum);
1864         }
1865         frame->temp_textures.clear();
1866         frame->ready_fence.reset();
1867         frame->input_frames.clear();
1868 }
1869
1870 void Mixer::start()
1871 {
1872         mixer_thread = thread(&Mixer::thread_func, this);
1873         audio_thread = thread(&Mixer::audio_thread_func, this);
1874 }
1875
1876 void Mixer::quit()
1877 {
1878         should_quit = true;
1879         audio_task_queue_changed.notify_one();
1880         mixer_thread.join();
1881         audio_thread.join();
1882 #ifdef HAVE_SRT
1883         if (global_flags.srt_port >= 0) {
1884                 // There's seemingly no other reasonable way to wake up the thread
1885                 // (libsrt's epoll equivalent is busy-waiting).
1886                 int sock = srt_socket(AF_INET6, 0, 0);
1887                 if (sock != -1) {
1888                         sockaddr_in6 addr;
1889                         memset(&addr, 0, sizeof(addr));
1890                         addr.sin6_family = AF_INET6;
1891                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1892                         addr.sin6_port = htons(global_flags.srt_port);
1893                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1894                         srt_close(sock);
1895                 }
1896                 srt_thread.join();
1897         }
1898 #endif
1899 }
1900
1901 void Mixer::transition_clicked(int transition_num)
1902 {
1903         theme->transition_clicked(transition_num, pts());
1904 }
1905
1906 void Mixer::channel_clicked(int preview_num)
1907 {
1908         theme->channel_clicked(preview_num);
1909 }
1910
1911 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1912 {
1913         lock_guard<mutex> lock(card_mutex);
1914         return ycbcr_interpretation[card_index];
1915 }
1916
1917 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1918 {
1919         lock_guard<mutex> lock(card_mutex);
1920         ycbcr_interpretation[card_index] = interpretation;
1921 }
1922
1923 void Mixer::start_mode_scanning(unsigned card_index)
1924 {
1925         assert(card_index < num_cards);
1926         if (is_mode_scanning[card_index]) {
1927                 return;
1928         }
1929         is_mode_scanning[card_index] = true;
1930         mode_scanlist[card_index].clear();
1931         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1932                 mode_scanlist[card_index].push_back(mode.first);
1933         }
1934         assert(!mode_scanlist[card_index].empty());
1935         mode_scanlist_index[card_index] = 0;
1936         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1937         last_mode_scan_change[card_index] = steady_clock::now();
1938 }
1939
1940 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1941 {
1942         assert(desired_output_card_index != -1);
1943         lock_guard<mutex> lock(card_mutex);
1944         return cards[desired_output_card_index].output->get_available_video_modes();
1945 }
1946
1947 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1948 {
1949         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1950         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1951 }
1952
1953 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1954         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1955         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1956 }
1957
1958 void Mixer::wait_for_next_frame()
1959 {
1960         unique_lock<mutex> lock(frame_num_mutex);
1961         unsigned old_frame_num = frame_num;
1962         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
1963                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1964 }
1965
1966 Mixer::OutputChannel::~OutputChannel()
1967 {
1968         if (has_current_frame) {
1969                 parent->release_display_frame(&current_frame);
1970         }
1971         if (has_ready_frame) {
1972                 parent->release_display_frame(&ready_frame);
1973         }
1974 }
1975
1976 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1977 {
1978         // Store this frame for display. Remove the ready frame if any
1979         // (it was seemingly never used).
1980         {
1981                 lock_guard<mutex> lock(frame_mutex);
1982                 if (has_ready_frame) {
1983                         parent->release_display_frame(&ready_frame);
1984                 }
1985                 ready_frame = move(frame);
1986                 has_ready_frame = true;
1987
1988                 // Call the callbacks under the mutex (they should be short),
1989                 // so that we don't race against a callback removal.
1990                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1991                         key_and_callback.second();
1992                 }
1993         }
1994
1995         // Reduce the number of callbacks by filtering duplicates. The reason
1996         // why we bother doing this is that Qt seemingly can get into a state
1997         // where its builds up an essentially unbounded queue of signals,
1998         // consuming more and more memory, and there's no good way of collapsing
1999         // user-defined signals or limiting the length of the queue.
2000         if (transition_names_updated_callback) {
2001                 vector<string> transition_names = global_mixer->get_transition_names();
2002                 bool changed = false;
2003                 if (transition_names.size() != last_transition_names.size()) {
2004                         changed = true;
2005                 } else {
2006                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2007                                 if (transition_names[i] != last_transition_names[i]) {
2008                                         changed = true;
2009                                         break;
2010                                 }
2011                         }
2012                 }
2013                 if (changed) {
2014                         transition_names_updated_callback(transition_names);
2015                         last_transition_names = transition_names;
2016                 }
2017         }
2018         if (name_updated_callback) {
2019                 string name = global_mixer->get_channel_name(channel);
2020                 if (name != last_name) {
2021                         name_updated_callback(name);
2022                         last_name = name;
2023                 }
2024         }
2025         if (color_updated_callback) {
2026                 string color = global_mixer->get_channel_color(channel);
2027                 if (color != last_color) {
2028                         color_updated_callback(color);
2029                         last_color = color;
2030                 }
2031         }
2032 }
2033
2034 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2035 {
2036         lock_guard<mutex> lock(frame_mutex);
2037         if (!has_current_frame && !has_ready_frame) {
2038                 return false;
2039         }
2040
2041         if (has_current_frame && has_ready_frame) {
2042                 // We have a new ready frame. Toss the current one.
2043                 parent->release_display_frame(&current_frame);
2044                 has_current_frame = false;
2045         }
2046         if (has_ready_frame) {
2047                 assert(!has_current_frame);
2048                 current_frame = move(ready_frame);
2049                 ready_frame.ready_fence.reset();  // Drop the refcount.
2050                 ready_frame.input_frames.clear();  // Drop the refcounts.
2051                 has_current_frame = true;
2052                 has_ready_frame = false;
2053         }
2054
2055         *frame = current_frame;
2056         return true;
2057 }
2058
2059 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2060 {
2061         lock_guard<mutex> lock(frame_mutex);
2062         new_frame_ready_callbacks[key] = callback;
2063 }
2064
2065 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2066 {
2067         lock_guard<mutex> lock(frame_mutex);
2068         new_frame_ready_callbacks.erase(key);
2069 }
2070
2071 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2072 {
2073         transition_names_updated_callback = callback;
2074 }
2075
2076 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2077 {
2078         name_updated_callback = callback;
2079 }
2080
2081 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2082 {
2083         color_updated_callback = callback;
2084 }
2085
2086 #ifdef HAVE_SRT
2087 void Mixer::start_srt()
2088 {
2089         SRTSOCKET sock = srt_socket(AF_INET6, 0, 0);
2090         sockaddr_in6 addr;
2091         memset(&addr, 0, sizeof(addr));
2092         addr.sin6_family = AF_INET6;
2093         addr.sin6_port = htons(global_flags.srt_port);
2094
2095         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2096         if (err != 0) {
2097                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2098                 abort();
2099         }
2100         err = srt_listen(sock, MAX_VIDEO_CARDS);
2101         if (err != 0) {
2102                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2103                 abort();
2104         }
2105
2106         srt_thread = thread([this, sock] {
2107                 sockaddr_in6 addr;
2108                 for ( ;; ) {
2109                         int sa_len = sizeof(addr);
2110                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2111                         if (should_quit) {
2112                                 if (clientsock != -1) {
2113                                         srt_close(clientsock);
2114                                 }
2115                                 break;
2116                         }
2117                         lock_guard<mutex> lock(hotplug_mutex);
2118                         hotplugged_srt_cards.push_back(clientsock);
2119                 }
2120                 srt_close(sock);
2121         });
2122 }
2123 #endif
2124
2125 #ifdef HAVE_SRT
2126 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2127 {
2128         SRT_TRACEBSTATS stats;
2129         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2130
2131         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2132         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2133         card->metric_srt_sent_bytes = stats.byteSentTotal;
2134         card->metric_srt_received_bytes = stats.byteRecvTotal;
2135         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2136         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2137         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2138         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2139         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2140         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2141         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2142         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2143         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2144         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2145         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2146         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2147         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2148         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2149         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2150         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2151         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2152         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2153         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2154         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2155
2156         // Gauges.
2157         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2158         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2159         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2160         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2161         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2162         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2163         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2164         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2165         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2166         card->metric_srt_mss_bytes = stats.byteMSS;
2167         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2168         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2169         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2170         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2171         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2172         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2173         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2174         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2175 }
2176 #endif
2177
2178 mutex RefCountedGLsync::fence_lock;