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)
 316         : httpd(),
 317           mixer_surface(create_surface(format)),
 318           h264_encoder_surface(create_surface(format)),
 319           decklink_output_surface(create_surface(format)),
 320           image_update_surface(create_surface(format))
 321 {
 322         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 323         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 324         check_error();
 325
 326         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 327             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 328                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 329                 exit(1);
 330         }
 331
 332         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 333         // will be halved when sampling them, and we need to compensate here.
 334         movit_texel_subpixel_precision /= 2.0;
 335
 336         resource_pool.reset(new ResourcePool);
 337         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 338                 output_channel[i].parent = this;
 339                 output_channel[i].channel = i;
 340         }
 341
 342         ImageFormat inout_format;
 343         inout_format.color_space = COLORSPACE_sRGB;
 344         inout_format.gamma_curve = GAMMA_sRGB;
 345
 346         // Matches the 4:2:0 format created by the main chain.
 347         YCbCrFormat ycbcr_format;
 348         ycbcr_format.chroma_subsampling_x = 2;
 349         ycbcr_format.chroma_subsampling_y = 2;
 350         if (global_flags.ycbcr_rec709_coefficients) {
 351                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 352         } else {
 353                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 354         }
 355         ycbcr_format.full_range = false;
 356         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 357         ycbcr_format.cb_x_position = 0.0f;
 358         ycbcr_format.cr_x_position = 0.0f;
 359         ycbcr_format.cb_y_position = 0.5f;
 360         ycbcr_format.cr_y_position = 0.5f;
 361
 362         // Initialize the neutral colors to sane values.
 363         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 364                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 365         }
 366
 367         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 368         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 369         check_error();
 370         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 371         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 372         display_chain->add_input(display_input);
 373         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 374         display_chain->set_dither_bits(0);  // Don't bother.
 375         display_chain->finalize();
 376
 377         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));
 378         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 379                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 380         }
 381
 382         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 383         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
 384
 385         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 386         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 387         audio_mixer.reset(new AudioMixer);
 388
 389         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 390         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 391                 char url[256];
 392                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 393                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 394         }
 395
 396         // Start listening for clients only once VideoEncoder has written its header, if any.
 397         httpd.start(global_flags.http_port);
 398
 399         // First try initializing the then PCI devices, then USB, then
 400         // fill up with fake cards until we have the desired number of cards.
 401         unsigned num_pci_devices = 0;
 402         unsigned card_index = 0;
 403
 404         {
 405                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 406                 if (decklink_iterator != nullptr) {
 407                         for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
 408                                 IDeckLink *decklink;
 409                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 410                                         break;
 411                                 }
 412
 413                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 414                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 415                                 if (!output->set_device(decklink)) {
 416                                         delete output;
 417                                         output = nullptr;
 418                                 }
 419                                 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
 420                                 ++num_pci_devices;
 421                         }
 422                         decklink_iterator->Release();
 423                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 424                 } else {
 425                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 426                 }
 427         }
 428
 429         unsigned num_usb_devices = BMUSBCapture::num_cards();
 430         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < unsigned(global_flags.max_num_cards); ++usb_card_index, ++card_index) {
 431                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 432                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 433                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
 434         }
 435         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 436
 437         // Fill up with fake cards for as long as we can, so that the FFmpeg
 438         // and HTML cards always come last.
 439         unsigned num_fake_cards = 0;
 440 #ifdef HAVE_CEF
 441         size_t num_html_inputs = theme->get_html_inputs().size();
 442 #else
 443         size_t num_html_inputs = 0;
 444 #endif
 445         for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
 446                 // Only bother to activate fake capture cards to satisfy the minimum.
 447                 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
 448                 if (is_active) {
 449                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 450                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 451                         ++num_fake_cards;
 452                 } else {
 453                         configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 454                 }
 455         }
 456
 457         if (num_fake_cards > 0) {
 458                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 459         }
 460
 461         // Initialize all video inputs the theme asked for.
 462         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 463                 if (card_index >= MAX_VIDEO_CARDS) {
 464                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 465                         abort();
 466                 }
 467                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 468                 video_inputs[video_card_index]->set_card_index(card_index);
 469         }
 470         num_video_inputs = video_inputs.size();
 471
 472 #ifdef HAVE_CEF
 473         // Same, for HTML inputs.
 474         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 475         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 476                 if (card_index >= MAX_VIDEO_CARDS) {
 477                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 478                         abort();
 479                 }
 480                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 481                 html_inputs[html_card_index]->set_card_index(card_index);
 482         }
 483         num_html_inputs = html_inputs.size();
 484 #endif
 485
 486         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 487         BMUSBCapture::start_bm_thread();
 488
 489 #ifdef HAVE_SRT
 490         if (global_flags.srt_port >= 0) {
 491                 start_srt();
 492         }
 493 #endif
 494
 495         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 496                 cards[card_index].queue_length_policy.reset(card_index);
 497         }
 498
 499         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 500
 501         if (global_flags.ten_bit_input) {
 502                 if (!v210Converter::has_hardware_support()) {
 503                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 504                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 505                         abort();
 506                 }
 507                 v210_converter.reset(new v210Converter());
 508
 509                 // These are all the widths listed in the Blackmagic SDK documentation
 510                 // (section 2.7.3, “Display Modes”).
 511                 v210_converter->precompile_shader(720);
 512                 v210_converter->precompile_shader(1280);
 513                 v210_converter->precompile_shader(1920);
 514                 v210_converter->precompile_shader(2048);
 515                 v210_converter->precompile_shader(3840);
 516                 v210_converter->precompile_shader(4096);
 517         }
 518         if (global_flags.ten_bit_output) {
 519                 if (!v210Converter::has_hardware_support()) {
 520                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 521                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 522                         abort();
 523                 }
 524         }
 525
 526         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 527         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 528         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 529
 530         if (global_flags.enable_alsa_output) {
 531                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 532         }
 533         if (global_flags.output_card != -1) {
 534                 desired_output_card_index = global_flags.output_card;
 535                 set_output_card_internal(global_flags.output_card);
 536         }
 537
 538         output_jitter_history.register_metrics({{ "card", "output" }});
 539
 540         ImageInput::start_update_thread(image_update_surface);
 541 }
 542
 543 Mixer::~Mixer()
 544 {
 545         ImageInput::end_update_thread();
 546
 547         if (mjpeg_encoder != nullptr) {
 548                 mjpeg_encoder->stop();
 549         }
 550         httpd.stop();
 551         BMUSBCapture::stop_bm_thread();
 552
 553         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 554                 if (cards[card_index].capture != nullptr) {  // Active.
 555                         cards[card_index].capture->stop_dequeue_thread();
 556                 }
 557                 if (cards[card_index].output) {
 558                         cards[card_index].output->end_output();
 559                         cards[card_index].output.reset();
 560                 }
 561         }
 562
 563         video_encoder.reset(nullptr);
 564 }
 565
 566 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 567 {
 568         bool is_active = capture != nullptr;
 569         if (is_active) {
 570                 printf("Configuring card %d...\n", card_index);
 571         } else {
 572                 assert(card_type == CardType::FAKE_CAPTURE);
 573         }
 574
 575         CaptureCard *card = &cards[card_index];
 576         if (card->capture != nullptr) {
 577                 card->capture->stop_dequeue_thread();
 578         }
 579         card->capture.reset(capture);
 580         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 581         if (card->is_fake_capture) {
 582                 card->fake_capture_counter = fake_capture_counter++;
 583         }
 584         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 585         card->may_have_dropped_last_frame = false;
 586         card->type = card_type;
 587         if (card->output.get() != output) {
 588                 card->output.reset(output);
 589         }
 590
 591         PixelFormat pixel_format;
 592         if (card_type == CardType::FFMPEG_INPUT) {
 593                 pixel_format = capture->get_current_pixel_format();
 594         } else if (card_type == CardType::CEF_INPUT) {
 595                 pixel_format = PixelFormat_8BitBGRA;
 596         } else if (global_flags.ten_bit_input) {
 597                 pixel_format = PixelFormat_10BitYCbCr;
 598         } else {
 599                 pixel_format = PixelFormat_8BitYCbCr;
 600         }
 601
 602         if (is_active) {
 603                 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 604                 if (card->frame_allocator == nullptr) {
 605                         card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 606                 } else {
 607                         // The format could have changed, but we cannot reset the allocator
 608                         // and create a new one from scratch, since there may be allocated
 609                         // frames from it that expect to call release_frame() on it.
 610                         // Instead, ask the allocator to create new frames for us and discard
 611                         // any old ones as they come back. This takes the mutex while
 612                         // allocating, but nothing should really be sending frames in there
 613                         // right now anyway (start_bm_capture() has not been called yet).
 614                         card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 615                 }
 616                 card->capture->set_video_frame_allocator(card->frame_allocator.get());
 617                 if (card->surface == nullptr) {
 618                         card->surface = create_surface_with_same_format(mixer_surface);
 619                 }
 620                 while (!card->new_frames.empty()) card->new_frames.pop_front();
 621                 card->last_timecode = -1;
 622                 card->capture->set_pixel_format(pixel_format);
 623                 card->capture->configure_card();
 624
 625                 // NOTE: start_bm_capture() happens in thread_func().
 626         }
 627
 628         if (is_srt_card) {
 629                 assert(card_type == CardType::FFMPEG_INPUT);
 630         }
 631
 632         DeviceSpec device;
 633         device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 634         audio_mixer->reset_resampler(device);
 635         unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
 636         if (is_active) {
 637                 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
 638         } else {
 639                 // Note: Keeps the previous name, if any.
 640                 char name[32];
 641                 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
 642                 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
 643         }
 644         audio_mixer->trigger_state_changed_callback();
 645
 646         // Unregister old metrics, if any.
 647         if (!card->labels.empty()) {
 648                 const vector<pair<string, string>> &labels = card->labels;
 649                 card->jitter_history.unregister_metrics(labels);
 650                 card->queue_length_policy.unregister_metrics(labels);
 651                 global_metrics.remove_if_exists("input_received_frames", labels);
 652                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 653                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 654                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 655                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 656                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 657
 658                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 659                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 660                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 661                 global_metrics.remove_if_exists("input_width_pixels", labels);
 662                 global_metrics.remove_if_exists("input_height_pixels", labels);
 663                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 664                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 665                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 666
 667                 // SRT metrics.
 668
 669                 // Global measurements (counters).
 670                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 671                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 672                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 673                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 674
 675                 vector<pair<string, string>> packet_labels = card->labels;
 676                 packet_labels.emplace_back("type", "normal");
 677                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 678                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 679
 680                 packet_labels.back().second = "lost";
 681                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 682                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 683
 684                 packet_labels.back().second = "retransmitted";
 685                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 686                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 687
 688                 packet_labels.back().second = "ack";
 689                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 690                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 691
 692                 packet_labels.back().second = "nak";
 693                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 694                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 695
 696                 packet_labels.back().second = "dropped";
 697                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 698                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 699                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 700                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 701
 702                 packet_labels.back().second = "undecryptable";
 703                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 704                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 705
 706                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 707                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 708                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 709                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 710
 711                 // Instant measurements (gauges).
 712                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 713                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 714                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 715                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 716                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 717                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 718                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 719                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 720                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 721                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 722
 723                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 724                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 725                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 726                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 727
 728                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 729                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 730                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 731                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 732         }
 733
 734         if (is_active) {
 735                 // Register metrics.
 736                 vector<pair<string, string>> labels;
 737                 char card_name[64];
 738                 snprintf(card_name, sizeof(card_name), "%d", card_index);
 739                 labels.emplace_back("card", card_name);
 740
 741                 switch (card_type) {
 742                 case CardType::LIVE_CARD:
 743                         labels.emplace_back("cardtype", "live");
 744                         break;
 745                 case CardType::FAKE_CAPTURE:
 746                         labels.emplace_back("cardtype", "fake");
 747                         break;
 748                 case CardType::FFMPEG_INPUT:
 749                         if (is_srt_card) {
 750                                 labels.emplace_back("cardtype", "srt");
 751                         } else {
 752                                 labels.emplace_back("cardtype", "ffmpeg");
 753                         }
 754                         break;
 755                 case CardType::CEF_INPUT:
 756                         labels.emplace_back("cardtype", "cef");
 757                         break;
 758                 default:
 759                         assert(false);
 760                 }
 761                 card->jitter_history.register_metrics(labels);
 762                 card->queue_length_policy.register_metrics(labels);
 763                 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 764                 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 765                 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 766                 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 767                 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 768                 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 769
 770                 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 771                 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 772                 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 773                 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 774                 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 775                 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 776                 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 777                 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 778
 779                 if (is_srt_card) {
 780                         // Global measurements (counters).
 781                         global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 782                         global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 783                         global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 784                         global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 785
 786                         vector<pair<string, string>> packet_labels = labels;
 787                         packet_labels.emplace_back("type", "normal");
 788                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 789                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 790
 791                         packet_labels.back().second = "lost";
 792                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 793                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 794
 795                         packet_labels.back().second = "retransmitted";
 796                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 797                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 798
 799                         packet_labels.back().second = "ack";
 800                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 801                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 802
 803                         packet_labels.back().second = "nak";
 804                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 805                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 806
 807                         packet_labels.back().second = "dropped";
 808                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 809                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 810                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 811                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 812
 813                         packet_labels.back().second = "undecryptable";
 814                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 815                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 816
 817                         global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 818                         global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 819                         global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 820                         global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 821
 822                         // Instant measurements (gauges).
 823                         global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 824                         global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 825                         global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 826                         global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 827                         global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 828                         global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 829                         global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 830                         global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 831                         global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 832                         global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 833
 834                         global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 835                         global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 836                         global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 837                         global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 838
 839                         global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 840                         global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 841                         global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 842                         global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 843                 }
 844
 845                 card->labels = labels;
 846         } else {
 847                 card->labels.clear();
 848         }
 849 }
 850
 851 void Mixer::set_output_card_internal(int card_index)
 852 {
 853         // We don't really need to take card_mutex, since we're in the mixer
 854         // thread and don't mess with any queues (which is the only thing that happens
 855         // from other threads), but it's probably the safest in the long run.
 856         unique_lock<mutex> lock(card_mutex);
 857         if (output_card_index != -1) {
 858                 // Switch the old card from output to input.
 859                 CaptureCard *old_card = &cards[output_card_index];
 860                 old_card->output->end_output();
 861
 862                 // Stop the fake card that we put into place.
 863                 // This needs to _not_ happen under the mutex, to avoid deadlock
 864                 // (delivering the last frame needs to take the mutex).
 865                 CaptureInterface *fake_capture = old_card->capture.get();
 866                 lock.unlock();
 867                 fake_capture->stop_dequeue_thread();
 868                 lock.lock();
 869                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 870                 old_card->is_fake_capture = false;
 871                 old_card->capture->start_bm_capture();
 872         }
 873         if (card_index != -1) {
 874                 CaptureCard *card = &cards[card_index];
 875                 CaptureInterface *capture = card->capture.get();
 876                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 877                 // several seconds to complete (blocking on DisableVideoInput);
 878                 // see if we can maybe do it asynchronously.
 879                 lock.unlock();
 880                 capture->stop_dequeue_thread();
 881                 lock.lock();
 882                 card->parked_capture = move(card->capture);
 883                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 884                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
 885                 card->queue_length_policy.reset(card_index);
 886                 card->capture->start_bm_capture();
 887                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 888                 card->output->start_output(desired_output_video_mode, pts_int);
 889         }
 890         output_card_index = card_index;
 891         output_jitter_history.clear();
 892 }
 893
 894 namespace {
 895
 896 int unwrap_timecode(uint16_t current_wrapped, int last)
 897 {
 898         uint16_t last_wrapped = last & 0xffff;
 899         if (current_wrapped > last_wrapped) {
 900                 return (last & ~0xffff) | current_wrapped;
 901         } else {
 902                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 903         }
 904 }
 905
 906 }  // namespace
 907
 908 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 909                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 910                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 911 {
 912         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 913         CaptureCard *card = &cards[card_index];
 914
 915         ++card->metric_input_received_frames;
 916         card->metric_input_has_signal_bool = video_format.has_signal;
 917         card->metric_input_is_connected_bool = video_format.is_connected;
 918         card->metric_input_interlaced_bool = video_format.interlaced;
 919         card->metric_input_width_pixels = video_format.width;
 920         card->metric_input_height_pixels = video_format.height;
 921         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 922         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 923         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 924
 925         if (is_mode_scanning[card_index]) {
 926                 if (video_format.has_signal) {
 927                         // Found a stable signal, so stop scanning.
 928                         is_mode_scanning[card_index] = false;
 929                 } else {
 930                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 931                         steady_clock::time_point now = steady_clock::now();
 932                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 933                         if (sec_since_last_switch > switch_time_s) {
 934                                 // It isn't this mode; try the next one.
 935                                 mode_scanlist_index[card_index]++;
 936                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 937                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 938                                 last_mode_scan_change[card_index] = now;
 939                         }
 940                 }
 941         }
 942
 943         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 944         assert(frame_length > 0);
 945
 946         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;
 947         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 948                 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",
 949                         description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
 950                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 951                 if (video_frame.owner) {
 952                         video_frame.owner->release_frame(video_frame);
 953                 }
 954                 if (audio_frame.owner) {
 955                         audio_frame.owner->release_frame(audio_frame);
 956                 }
 957                 return;
 958         }
 959
 960         int dropped_frames = 0;
 961         if (card->last_timecode != -1) {
 962                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 963         }
 964
 965         // Number of samples per frame if we need to insert silence.
 966         // (Could be nonintegral, but resampling will save us then.)
 967         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 968
 969         if (dropped_frames > MAX_FPS * 2) {
 970                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 971                         description_for_card(card_index).c_str(), card->last_timecode, timecode);
 972                 audio_mixer->reset_resampler(device);
 973                 dropped_frames = 0;
 974                 ++card->metric_input_resets;
 975         } else if (dropped_frames > 0) {
 976                 // Insert silence as needed.
 977                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 978                         description_for_card(card_index).c_str(), dropped_frames, timecode);
 979                 card->metric_input_dropped_frames_error += dropped_frames;
 980
 981                 bool success;
 982                 do {
 983                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 984                 } while (!success);
 985         }
 986
 987         if (num_samples > 0) {
 988                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
 989
 990                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
 991                 // just gets dropped for now.
 992                 //
 993                 // Only bother doing MJPEG encoding if there are any connected clients
 994                 // that want the stream.
 995                 if (httpd.get_num_connected_multicam_clients() > 0 ||
 996                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
 997                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
 998                         lock_guard<mutex> lock(card_mutex);
 999                         if (card->new_raw_audio.empty()) {
1000                                 card->new_raw_audio = move(converted_samples);
1001                         } else {
1002                                 // For raw audio, we don't really synchronize audio and video;
1003                                 // we just put the audio in frame by frame, and if a video frame is
1004                                 // dropped, we still keep the audio, which means it will be added
1005                                 // to the beginning of the next frame. It would probably be better
1006                                 // to move the audio pts earlier to show this, but most players can
1007                                 // live with some jitter, and in a lot of ways, it's much nicer for
1008                                 // Futatabi to have all audio locked to a video frame.
1009                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1010
1011                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1012                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1013                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1014                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1015                                 }
1016                         }
1017                 }
1018         }
1019
1020         // Done with the audio, so release it.
1021         if (audio_frame.owner) {
1022                 audio_frame.owner->release_frame(audio_frame);
1023         }
1024
1025         card->last_timecode = timecode;
1026
1027         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1028         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1029                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1030                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1031                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1032         }
1033 #ifdef HAVE_SRT
1034         if (card->type == CardType::FFMPEG_INPUT) {
1035                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1036                 if (srt_sock != -1) {
1037                         update_srt_stats(srt_sock, card);
1038                 }
1039         }
1040 #endif
1041
1042         size_t y_offset, cbcr_offset;
1043         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1044         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1045                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1046                 assert(card->type == CardType::FFMPEG_INPUT);
1047                 assert(video_offset == 0);
1048                 expected_length = video_frame.len;
1049
1050                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1051                 y_offset = 0;
1052                 cbcr_offset = video_format.width * video_format.height;
1053         } else {
1054                 // All the other Y'CbCr formats are 4:2:2.
1055                 y_offset = video_frame.size / 2 + video_offset / 2;
1056                 cbcr_offset = video_offset / 2;
1057         }
1058         if (video_frame.len - video_offset == 0 ||
1059             video_frame.len - video_offset != expected_length) {
1060                 if (video_frame.len != 0) {
1061                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1062                                 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1063                 }
1064                 if (video_frame.owner) {
1065                         video_frame.owner->release_frame(video_frame);
1066                 }
1067
1068                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1069                 // so that pts can go up accordingly.
1070                 {
1071                         lock_guard<mutex> lock(card_mutex);
1072                         CaptureCard::NewFrame new_frame;
1073                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1074                         new_frame.length = frame_length;
1075                         new_frame.interlaced = false;
1076                         new_frame.dropped_frames = dropped_frames;
1077                         new_frame.received_timestamp = video_frame.received_timestamp;
1078                         card->new_frames.push_back(move(new_frame));
1079                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1080                 }
1081                 card->new_frames_changed.notify_all();
1082                 return;
1083         }
1084
1085         unsigned num_fields = video_format.interlaced ? 2 : 1;
1086         steady_clock::time_point frame_upload_start;
1087         if (video_format.interlaced) {
1088                 // Send the two fields along as separate frames; the other side will need to add
1089                 // a deinterlacer to actually get this right.
1090                 assert(video_format.height % 2 == 0);
1091                 video_format.height /= 2;
1092                 assert(frame_length % 2 == 0);
1093                 frame_length /= 2;
1094                 num_fields = 2;
1095                 frame_upload_start = steady_clock::now();
1096         }
1097         assert(userdata != nullptr);
1098         userdata->last_interlaced = video_format.interlaced;
1099         userdata->last_has_signal = video_format.has_signal;
1100         userdata->last_is_connected = video_format.is_connected;
1101         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1102         userdata->last_frame_rate_den = video_format.frame_rate_den;
1103         RefCountedFrame frame(video_frame);
1104
1105         // Send the frames on to the main thread, which will upload and process htem.
1106         // It is entirely possible to upload them in the same thread (and it might even be
1107         // faster, depending on the GPU and driver), but it appears to be trickling
1108         // driver bugs very easily.
1109         //
1110         // Note that this means we must hold on to the actual frame data in <userdata>
1111         // until the upload is done, but we hold on to <frame> much longer than that
1112         // (in fact, all the way until we no longer use the texture in rendering).
1113         for (unsigned field = 0; field < num_fields; ++field) {
1114                 if (field == 1) {
1115                         // Don't upload the second field as fast as we can; wait until
1116                         // the field time has approximately passed. (Otherwise, we could
1117                         // get timing jitter against the other sources, and possibly also
1118                         // against the video display, although the latter is not as critical.)
1119                         // This requires our system clock to be reasonably close to the
1120                         // video clock, but that's not an unreasonable assumption.
1121                         steady_clock::time_point second_field_start = frame_upload_start +
1122                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1123                         this_thread::sleep_until(second_field_start);
1124                 }
1125
1126                 {
1127                         lock_guard<mutex> lock(card_mutex);
1128                         CaptureCard::NewFrame new_frame;
1129                         new_frame.frame = frame;
1130                         new_frame.length = frame_length;
1131                         new_frame.field = field;
1132                         new_frame.interlaced = video_format.interlaced;
1133                         new_frame.dropped_frames = dropped_frames;
1134                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1135                         new_frame.video_format = video_format;
1136                         new_frame.video_offset = video_offset;
1137                         new_frame.y_offset = y_offset;
1138                         new_frame.cbcr_offset = cbcr_offset;
1139                         new_frame.texture_uploaded = false;
1140                         if (card->type == CardType::FFMPEG_INPUT) {
1141                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1142                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1143                         }
1144                         card->new_frames.push_back(move(new_frame));
1145                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1146                         card->may_have_dropped_last_frame = false;
1147                 }
1148                 card->new_frames_changed.notify_all();
1149         }
1150 }
1151
1152 void Mixer::upload_texture_for_frame(
1153         int field, bmusb::VideoFormat video_format,
1154         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1155 {
1156         size_t cbcr_width, cbcr_height;
1157         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1158                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1159                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1160         } else {
1161                 // All the other Y'CbCr formats are 4:2:2.
1162                 cbcr_width = video_format.width / 2;
1163                 cbcr_height = video_format.height;
1164         }
1165
1166         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1167         if (video_format.interlaced) {
1168                 cbcr_height /= 2;
1169         }
1170
1171         unsigned field_start_line;
1172         if (field == 1) {
1173                 field_start_line = video_format.second_field_start;
1174         } else {
1175                 field_start_line = video_format.extra_lines_top;
1176         }
1177
1178         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1179         size_t v210_width = video_format.stride / sizeof(uint32_t);
1180         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1181
1182         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1183         check_error();
1184
1185         switch (userdata->pixel_format) {
1186                 case PixelFormat_10BitYCbCr: {
1187                         size_t field_start = video_offset + video_format.stride * field_start_line;
1188                         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);
1189                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1190                         break;
1191                 }
1192                 case PixelFormat_8BitYCbCr: {
1193                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1194                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1195
1196                         // Make up our own strides, since we are interleaving.
1197                         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);
1198                         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);
1199                         break;
1200                 }
1201                 case PixelFormat_8BitYCbCrPlanar: {
1202                         assert(field_start_line == 0);  // We don't really support interlaced here.
1203                         size_t field_y_start = y_offset;
1204                         size_t field_cb_start = cbcr_offset;
1205                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1206
1207                         // Make up our own strides, since we are interleaving.
1208                         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);
1209                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1210                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1211                         break;
1212                 }
1213                 case PixelFormat_8BitBGRA: {
1214                         size_t field_start = video_offset + video_format.stride * field_start_line;
1215                         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);
1216                         // These could be asked to deliver mipmaps at any time.
1217                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1218                         check_error();
1219                         glGenerateMipmap(GL_TEXTURE_2D);
1220                         check_error();
1221                         glBindTexture(GL_TEXTURE_2D, 0);
1222                         check_error();
1223                         break;
1224                 }
1225                 default:
1226                         assert(false);
1227         }
1228
1229         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1230         check_error();
1231 }
1232
1233 void Mixer::bm_hotplug_add(libusb_device *dev)
1234 {
1235         lock_guard<mutex> lock(hotplug_mutex);
1236         hotplugged_cards.push_back(dev);
1237 }
1238
1239 void Mixer::bm_hotplug_remove(unsigned card_index)
1240 {
1241         cards[card_index].new_frames_changed.notify_all();
1242 }
1243
1244 void Mixer::thread_func()
1245 {
1246         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1247
1248         eglBindAPI(EGL_OPENGL_API);
1249         QOpenGLContext *context = create_context(mixer_surface);
1250         if (!make_current(context, mixer_surface)) {
1251                 printf("oops\n");
1252                 abort();
1253         }
1254
1255         // Start the actual capture. (We don't want to do it before we're actually ready
1256         // to process output frames.)
1257         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1258                 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1259                         cards[card_index].capture->start_bm_capture();
1260                 }
1261         }
1262
1263         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1264         int stats_dropped_frames = 0;
1265
1266         while (!should_quit) {
1267                 if (desired_output_card_index != output_card_index) {
1268                         set_output_card_internal(desired_output_card_index);
1269                 }
1270                 if (output_card_index != -1 &&
1271                     desired_output_video_mode != output_video_mode) {
1272                         DeckLinkOutput *output = cards[output_card_index].output.get();
1273                         output->end_output();
1274                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1275                         output->start_output(desired_output_video_mode, pts_int);
1276                 }
1277
1278                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1279                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1280
1281                 bool master_card_is_output;
1282                 unsigned master_card_index;
1283                 if (output_card_index != -1) {
1284                         master_card_is_output = true;
1285                         master_card_index = output_card_index;
1286                 } else {
1287                         master_card_is_output = false;
1288                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1289                         assert(master_card_index < MAX_VIDEO_CARDS);
1290                 }
1291
1292                 handle_hotplugged_cards();
1293
1294                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1295                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1296                 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);
1297                 stats_dropped_frames += output_frame_info.dropped_frames;
1298
1299                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1300                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1301                                 continue;
1302                         }
1303                         if (new_frames[card_index].frame->len == 0) {
1304                                 ++new_frames[card_index].dropped_frames;
1305                         }
1306                         if (new_frames[card_index].dropped_frames > 0) {
1307                                 printf("%s dropped %d frames before this\n",
1308                                         description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1309                         }
1310                 }
1311
1312                 // If the first card is reporting a corrupted or otherwise dropped frame,
1313                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1314                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1315                         ++stats_dropped_frames;
1316                         pts_int += new_frames[master_card_index].length;
1317                         continue;
1318                 }
1319
1320                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1321                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1322                                 continue;
1323
1324                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1325                         assert(new_frame->frame != nullptr);
1326                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1327                         check_error();
1328
1329                         // The new texture might need uploading before use.
1330                         if (!new_frame->texture_uploaded) {
1331                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1332                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1333                                 new_frame->texture_uploaded = true;
1334                         }
1335
1336                         // Only set the white balance if it actually changed. This means that the user
1337                         // is free to override the white balance in a video with no white balance information
1338                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1339                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1340                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1341                         // that the change takes effect on exactly the right frame.
1342                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1343                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1344                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1345                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1346                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1347                         }
1348
1349                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1350                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1351                                 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);
1352                         }
1353
1354                 }
1355
1356                 int64_t frame_duration = output_frame_info.frame_duration;
1357                 render_one_frame(frame_duration);
1358                 {
1359                         lock_guard<mutex> lock(frame_num_mutex);
1360                         ++frame_num;
1361                 }
1362                 frame_num_updated.notify_all();
1363                 pts_int += frame_duration;
1364
1365                 basic_stats.update(frame_num, stats_dropped_frames);
1366                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1367
1368                 if (should_cut.exchange(false)) {  // Test and clear.
1369                         video_encoder->do_cut(frame_num);
1370                 }
1371
1372 #if 0
1373                 // Reset every 100 frames, so that local variations in frame times
1374                 // (especially for the first few frames, when the shaders are
1375                 // compiled etc.) don't make it hard to measure for the entire
1376                 // remaining duration of the program.
1377                 if (frame == 10000) {
1378                         frame = 0;
1379                         start = now;
1380                 }
1381 #endif
1382                 check_error();
1383         }
1384
1385         resource_pool->clean_context();
1386 }
1387
1388 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1389 {
1390         if (output_card_index != -1) {
1391                 // The output card (ie., cards[output_card_index].output) is the master clock,
1392                 // so no input card (ie., cards[card_index].capture) is.
1393                 return false;
1394         }
1395         return (card_index == master_card_index);
1396 }
1397
1398 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1399 {
1400         // Count the number of frames in the queue, including any frames
1401         // we dropped. It's hard to know exactly how we should deal with
1402         // dropped (corrupted) input frames; they don't help our goal of
1403         // avoiding starvation, but they still add to the problem of latency.
1404         // Since dropped frames is going to mean a bump in the signal anyway,
1405         // we err on the side of having more stable latency instead.
1406         unsigned queue_length = 0;
1407         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1408                 queue_length += frame.dropped_frames + 1;
1409         }
1410
1411         // If needed, drop frames until the queue is below the safe limit.
1412         // We prefer to drop from the head, because all else being equal,
1413         // we'd like more recent frames (less latency).
1414         unsigned dropped_frames = 0;
1415         while (queue_length > safe_queue_length) {
1416                 assert(!card->new_frames.empty());
1417                 assert(queue_length > card->new_frames.front().dropped_frames);
1418                 queue_length -= card->new_frames.front().dropped_frames;
1419
1420                 if (queue_length <= safe_queue_length) {
1421                         // No need to drop anything.
1422                         break;
1423                 }
1424
1425                 card->new_frames.pop_front();
1426                 card->new_frames_changed.notify_all();
1427                 --queue_length;
1428                 ++dropped_frames;
1429
1430                 if (queue_length == 0 && card->is_cef_capture) {
1431                         card->may_have_dropped_last_frame = true;
1432                 }
1433         }
1434
1435         card->metric_input_dropped_frames_jitter += dropped_frames;
1436         card->metric_input_queue_length_frames = queue_length;
1437
1438 #if 0
1439         if (dropped_frames > 0) {
1440                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1441                         card_index, dropped_frames);
1442         }
1443 #endif
1444 }
1445
1446 pair<string, string> Mixer::get_channels_json()
1447 {
1448         Channels ret;
1449         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1450                 Channel *channel = ret.add_channel();
1451                 channel->set_index(channel_idx + 2);
1452                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1453                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1454         }
1455         string contents;
1456         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1457         return make_pair(contents, "text/json");
1458 }
1459
1460 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1461 {
1462         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1463 }
1464
1465 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])
1466 {
1467         OutputFrameInfo output_frame_info;
1468 start:
1469         unique_lock<mutex> lock(card_mutex, defer_lock);
1470         if (master_card_is_output) {
1471                 // Clocked to the output, so wait for it to be ready for the next frame.
1472                 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);
1473                 lock.lock();
1474         } else {
1475                 // Wait for the master card to have a new frame.
1476                 // TODO: Add a timeout.
1477                 output_frame_info.is_preroll = false;
1478                 lock.lock();
1479                 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(); });
1480         }
1481
1482         if (master_card_is_output) {
1483                 handle_hotplugged_cards();
1484         } else if (cards[master_card_index].new_frames.empty()) {
1485                 // We were woken up, but not due to a new frame. Deal with it
1486                 // and then restart.
1487                 assert(cards[master_card_index].capture->get_disconnected());
1488                 handle_hotplugged_cards();
1489                 lock.unlock();
1490                 goto start;
1491         }
1492
1493         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1494                 CaptureCard *card = &cards[card_index];
1495                 if (card->new_frames.empty()) {  // Starvation.
1496                         ++card->metric_input_duped_frames;
1497 #ifdef HAVE_CEF
1498                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1499                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1500                                 // stream of frames, so we'll have to ask it to repaint the frame
1501                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1502                                 // trim the queue completely away, and cleared when we actually
1503                                 // get a new frame.)
1504                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1505                         }
1506 #endif
1507                 } else {
1508                         new_frames[card_index] = move(card->new_frames.front());
1509                         has_new_frame[card_index] = true;
1510                         card->new_frames.pop_front();
1511                         card->new_frames_changed.notify_all();
1512                 }
1513
1514                 raw_audio[card_index] = move(card->new_raw_audio);
1515         }
1516
1517         if (!master_card_is_output) {
1518                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1519                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1520                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1521         }
1522
1523         if (!output_frame_info.is_preroll) {
1524                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1525         }
1526
1527         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1528                 CaptureCard *card = &cards[card_index];
1529                 if (has_new_frame[card_index] &&
1530                     !input_card_is_master_clock(card_index, master_card_index) &&
1531                     !output_frame_info.is_preroll) {
1532                         card->queue_length_policy.update_policy(
1533                                 output_frame_info.frame_timestamp,
1534                                 card->jitter_history.get_expected_next_frame(),
1535                                 new_frames[master_card_index].length,
1536                                 output_frame_info.frame_duration,
1537                                 card->jitter_history.estimate_max_jitter(),
1538                                 output_jitter_history.estimate_max_jitter());
1539                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1540                                                   card->queue_length_policy.get_safe_queue_length()));
1541                 }
1542         }
1543
1544         // This might get off by a fractional sample when changing master card
1545         // between ones with different frame rates, but that's fine.
1546         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1547         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1548         fractional_samples = num_samples_times_timebase % TIMEBASE;
1549         assert(output_frame_info.num_samples >= 0);
1550
1551         return output_frame_info;
1552 }
1553
1554 void Mixer::handle_hotplugged_cards()
1555 {
1556         // Check for cards that have been disconnected since last frame.
1557         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1558                 CaptureCard *card = &cards[card_index];
1559                 if (card->capture != nullptr && card->capture->get_disconnected()) {
1560                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1561                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1562                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1563                         card->queue_length_policy.reset(card_index);
1564                         card->capture->start_bm_capture();
1565                 }
1566         }
1567
1568         // Count how many active cards we already have. Used below to check that we
1569         // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1570         // and HTML “cards” don't count towards this limit.
1571         int num_video_cards = 0;
1572         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1573                 CaptureCard *card = &cards[card_index];
1574                 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1575                         ++num_video_cards;
1576                 }
1577         }
1578
1579         // Check for cards that have been connected since last frame.
1580         vector<libusb_device *> hotplugged_cards_copy;
1581 #ifdef HAVE_SRT
1582         vector<int> hotplugged_srt_cards_copy;
1583 #endif
1584         {
1585                 lock_guard<mutex> lock(hotplug_mutex);
1586                 swap(hotplugged_cards, hotplugged_cards_copy);
1587 #ifdef HAVE_SRT
1588                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1589 #endif
1590         }
1591         for (libusb_device *new_dev : hotplugged_cards_copy) {
1592                 // Look for a fake capture card where we can stick this in.
1593                 int free_card_index = -1;
1594                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1595                         if (cards[card_index].is_fake_capture) {
1596                                 free_card_index = card_index;
1597                                 break;
1598                         }
1599                 }
1600
1601                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1602                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1603                         libusb_unref_device(new_dev);
1604                 } else {
1605                         // BMUSBCapture takes ownership.
1606                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1607                         CaptureCard *card = &cards[free_card_index];
1608                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1609                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1610                         card->queue_length_policy.reset(free_card_index);
1611                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1612                         capture->start_bm_capture();
1613                 }
1614         }
1615
1616 #ifdef HAVE_SRT
1617         // Same, for SRT inputs.
1618         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1619                 char name[256];
1620                 int namelen = sizeof(name);
1621                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1622                 string stream_id(name, namelen);
1623
1624                 // Look for a fake capture card where we can stick this in.
1625                 // Prioritize ones that previously held SRT streams with the
1626                 // same stream ID, if any exist -- and it multiple exist,
1627                 // take the one that disconnected the last.
1628                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1629                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1630                         CaptureCard *card = &cards[card_index];
1631                         if (!card->is_fake_capture) {
1632                                 continue;
1633                         }
1634                         if (first_free_card_index == -1) {
1635                                 first_free_card_index = card_index;
1636                         }
1637                         if (card->last_srt_stream_id == stream_id &&
1638                             (last_matching_free_card_index == -1 ||
1639                              card->fake_capture_counter >
1640                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1641                                 last_matching_free_card_index = card_index;
1642                         }
1643                 }
1644
1645                 const int free_card_index = (last_matching_free_card_index != -1)
1646                         ? last_matching_free_card_index : first_free_card_index;
1647                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1648                         if (stream_id.empty()) {
1649                                 stream_id = "no name";
1650                         }
1651                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1652                         srt_close(sock);
1653                 } else {
1654                         // FFmpegCapture takes ownership.
1655                         if (stream_id.empty()) {
1656                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1657                         } else {
1658                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1659                         }
1660                         CaptureCard *card = &cards[free_card_index];
1661                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1662                         capture->set_card_index(free_card_index);
1663                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1664                         update_srt_stats(sock, card);  // Initial zero stats.
1665                         card->last_srt_stream_id = stream_id;
1666                         card->queue_length_policy.reset(free_card_index);
1667                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1668                         capture->start_bm_capture();
1669                 }
1670         }
1671 #endif
1672
1673         // Finally, newly forced-to-active fake capture cards.
1674         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1675                 CaptureCard *card = &cards[card_index];
1676                 if (card->capture == nullptr && card->force_active) {
1677                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1678                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1679                         card->queue_length_policy.reset(card_index);
1680                         card->capture->start_bm_capture();
1681                 }
1682         }
1683 }
1684
1685
1686 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)
1687 {
1688         // Resample the audio as needed, including from previously dropped frames.
1689         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1690                 const bool dropped_frame = (frame_num != dropped_frames);
1691                 {
1692                         // Signal to the audio thread to process this frame.
1693                         // Note that if the frame is a dropped frame, we signal that
1694                         // we don't want to use this frame as base for adjusting
1695                         // the resampler rate. The reason for this is that the timing
1696                         // of these frames is often way too late; they typically don't
1697                         // “arrive” before we synthesize them. Thus, we could end up
1698                         // in a situation where we have inserted e.g. five audio frames
1699                         // into the queue before we then start pulling five of them
1700                         // back out. This makes ResamplingQueue overestimate the delay,
1701                         // causing undue resampler changes. (We _do_ use the last,
1702                         // non-dropped frame; perhaps we should just discard that as well,
1703                         // since dropped frames are expected to be rare, and it might be
1704                         // better to just wait until we have a slightly more normal situation).
1705                         lock_guard<mutex> lock(audio_mutex);
1706                         bool adjust_rate = !dropped_frame && !is_preroll;
1707                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1708                         audio_task_queue_changed.notify_one();
1709                 }
1710                 if (dropped_frame) {
1711                         // For dropped frames, increase the pts. Note that if the format changed
1712                         // in the meantime, we have no way of detecting that; we just have to
1713                         // assume the frame length is always the same.
1714                         pts_int += length_per_frame;
1715                 }
1716         }
1717 }
1718
1719 void Mixer::render_one_frame(int64_t duration)
1720 {
1721         // Determine the time code for this frame before we start rendering.
1722         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1723         if (display_timecode_on_stdout) {
1724                 printf("Timecode: '%s'\n", timecode_text.c_str());
1725         }
1726
1727         // Update Y'CbCr settings for all cards.
1728         {
1729                 lock_guard<mutex> lock(card_mutex);
1730                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1731                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1732                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1733                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1734                         input_state.full_range[card_index] = interpretation->full_range;
1735                 }
1736         }
1737
1738         // Get the main chain from the theme, and set its state immediately.
1739         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1740         EffectChain *chain = theme_main_chain.chain;
1741         theme_main_chain.setup_chain();
1742         //theme_main_chain.chain->enable_phase_timing(true);
1743
1744         // If HDMI/SDI output is active and the user has requested auto mode,
1745         // its mode overrides the existing Y'CbCr setting for the chain.
1746         YCbCrLumaCoefficients ycbcr_output_coefficients;
1747         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1748                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1749         } else {
1750                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1751         }
1752
1753         // TODO: Reduce the duplication against theme.cpp.
1754         YCbCrFormat output_ycbcr_format;
1755         output_ycbcr_format.chroma_subsampling_x = 1;
1756         output_ycbcr_format.chroma_subsampling_y = 1;
1757         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1758         output_ycbcr_format.full_range = false;
1759         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1760         chain->change_ycbcr_output_format(output_ycbcr_format);
1761
1762         // Render main chain. If we're using zerocopy Quick Sync encoding
1763         // (the default case), we take an extra copy of the created outputs,
1764         // so that we can display it back to the screen later (it's less memory
1765         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1766         // Ideally, we'd like to avoid taking copies and just use the main textures
1767         // for display as well, but they're just views into VA-API memory and must be
1768         // unmapped during encoding, so we can't use them for display, unfortunately.
1769         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1770         GLuint y_copy_tex, cbcr_copy_tex = 0;
1771         GLuint y_display_tex, cbcr_display_tex;
1772         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1773         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1774         const bool is_zerocopy = video_encoder->is_zerocopy();
1775         if (is_zerocopy) {
1776                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1777                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1778                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1779
1780                 y_display_tex = y_copy_tex;
1781                 cbcr_display_tex = cbcr_copy_tex;
1782
1783                 // y_tex and cbcr_tex will be given by VideoEncoder.
1784         } else {
1785                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1786                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1787                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1788
1789                 y_display_tex = y_tex;
1790                 cbcr_display_tex = cbcr_tex;
1791         }
1792
1793         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1794         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1795         assert(got_frame);
1796
1797         GLuint fbo;
1798         if (is_zerocopy) {
1799                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1800         } else {
1801                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1802         }
1803         check_error();
1804         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1805
1806         if (display_timecode_in_stream) {
1807                 // Render the timecode on top.
1808                 timecode_renderer->render_timecode(fbo, timecode_text);
1809         }
1810
1811         resource_pool->release_fbo(fbo);
1812
1813         if (is_zerocopy) {
1814                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1815         } else {
1816                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1817         }
1818         if (output_card_index != -1) {
1819                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1820         }
1821         resource_pool->release_2d_texture(cbcr_full_tex);
1822
1823         // Set the right state for the Y' and CbCr textures we use for display.
1824         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1825         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1826         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1827         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1828         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1829
1830         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1831         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1832         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1833         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1834
1835         RefCountedGLsync fence = video_encoder->end_frame();
1836
1837         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1838         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1839         DisplayFrame live_frame;
1840         live_frame.chain = display_chain.get();
1841         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1842                 display_input->set_texture_num(0, y_display_tex);
1843                 display_input->set_texture_num(1, cbcr_display_tex);
1844         };
1845         live_frame.ready_fence = fence;
1846         live_frame.input_frames = {};
1847         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1848         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1849
1850         // Set up preview and any additional channels.
1851         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1852                 DisplayFrame display_frame;
1853                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1854                 display_frame.chain = move(chain.chain);
1855                 display_frame.setup_chain = move(chain.setup_chain);
1856                 display_frame.ready_fence = fence;
1857                 display_frame.input_frames = move(chain.input_frames);
1858                 display_frame.temp_textures = {};
1859                 output_channel[i].output_frame(move(display_frame));
1860         }
1861 }
1862
1863 void Mixer::audio_thread_func()
1864 {
1865         pthread_setname_np(pthread_self(), "Mixer_Audio");
1866
1867         while (!should_quit) {
1868                 AudioTask task;
1869
1870                 {
1871                         unique_lock<mutex> lock(audio_mutex);
1872                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1873                         if (should_quit) {
1874                                 return;
1875                         }
1876                         task = audio_task_queue.front();
1877                         audio_task_queue.pop();
1878                 }
1879
1880                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1881                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1882                 vector<float> samples_out = audio_mixer->get_output(
1883                         task.frame_timestamp,
1884                         task.num_samples,
1885                         rate_adjustment_policy);
1886
1887                 // Send the samples to the sound card, then add them to the output.
1888                 if (alsa) {
1889                         alsa->write(samples_out);
1890                 }
1891                 if (output_card_index != -1) {
1892                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1893                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1894                 }
1895                 video_encoder->add_audio(task.pts_int, move(samples_out));
1896         }
1897 }
1898
1899 void Mixer::release_display_frame(DisplayFrame *frame)
1900 {
1901         for (GLuint texnum : frame->temp_textures) {
1902                 resource_pool->release_2d_texture(texnum);
1903         }
1904         frame->temp_textures.clear();
1905         frame->ready_fence.reset();
1906         frame->input_frames.clear();
1907 }
1908
1909 void Mixer::start()
1910 {
1911         mixer_thread = thread(&Mixer::thread_func, this);
1912         audio_thread = thread(&Mixer::audio_thread_func, this);
1913 }
1914
1915 void Mixer::quit()
1916 {
1917         should_quit = true;
1918         audio_task_queue_changed.notify_one();
1919         mixer_thread.join();
1920         audio_thread.join();
1921 #ifdef HAVE_SRT
1922         if (global_flags.srt_port >= 0) {
1923                 // There's seemingly no other reasonable way to wake up the thread
1924                 // (libsrt's epoll equivalent is busy-waiting).
1925                 int sock = srt_socket(AF_INET6, 0, 0);
1926                 if (sock != -1) {
1927                         sockaddr_in6 addr;
1928                         memset(&addr, 0, sizeof(addr));
1929                         addr.sin6_family = AF_INET6;
1930                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1931                         addr.sin6_port = htons(global_flags.srt_port);
1932                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1933                         srt_close(sock);
1934                 }
1935                 srt_thread.join();
1936         }
1937 #endif
1938 }
1939
1940 void Mixer::transition_clicked(int transition_num)
1941 {
1942         theme->transition_clicked(transition_num, pts());
1943 }
1944
1945 void Mixer::channel_clicked(int preview_num)
1946 {
1947         theme->channel_clicked(preview_num);
1948 }
1949
1950 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1951 {
1952         lock_guard<mutex> lock(card_mutex);
1953         return ycbcr_interpretation[card_index];
1954 }
1955
1956 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1957 {
1958         lock_guard<mutex> lock(card_mutex);
1959         ycbcr_interpretation[card_index] = interpretation;
1960 }
1961
1962 void Mixer::start_mode_scanning(unsigned card_index)
1963 {
1964         assert(card_index < MAX_VIDEO_CARDS);
1965         if (cards[card_index].capture != nullptr) {
1966                 // Inactive card. Should never happen.
1967                 return;
1968         }
1969         if (is_mode_scanning[card_index]) {
1970                 return;
1971         }
1972         is_mode_scanning[card_index] = true;
1973         mode_scanlist[card_index].clear();
1974         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1975                 mode_scanlist[card_index].push_back(mode.first);
1976         }
1977         assert(!mode_scanlist[card_index].empty());
1978         mode_scanlist_index[card_index] = 0;
1979         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1980         last_mode_scan_change[card_index] = steady_clock::now();
1981 }
1982
1983 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1984 {
1985         assert(desired_output_card_index != -1);
1986         lock_guard<mutex> lock(card_mutex);
1987         return cards[desired_output_card_index].output->get_available_video_modes();
1988 }
1989
1990 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1991 {
1992         assert(card_index < MAX_VIDEO_CARDS);
1993         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
1994         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1995 }
1996
1997 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1998         assert(card_index < MAX_VIDEO_CARDS);
1999         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2000         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2001 }
2002
2003 void Mixer::wait_for_next_frame()
2004 {
2005         unique_lock<mutex> lock(frame_num_mutex);
2006         unsigned old_frame_num = frame_num;
2007         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
2008                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2009 }
2010
2011 Mixer::OutputChannel::~OutputChannel()
2012 {
2013         if (has_current_frame) {
2014                 parent->release_display_frame(&current_frame);
2015         }
2016         if (has_ready_frame) {
2017                 parent->release_display_frame(&ready_frame);
2018         }
2019 }
2020
2021 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2022 {
2023         // Store this frame for display. Remove the ready frame if any
2024         // (it was seemingly never used).
2025         {
2026                 lock_guard<mutex> lock(frame_mutex);
2027                 if (has_ready_frame) {
2028                         parent->release_display_frame(&ready_frame);
2029                 }
2030                 ready_frame = move(frame);
2031                 has_ready_frame = true;
2032
2033                 // Call the callbacks under the mutex (they should be short),
2034                 // so that we don't race against a callback removal.
2035                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2036                         key_and_callback.second();
2037                 }
2038         }
2039
2040         // Reduce the number of callbacks by filtering duplicates. The reason
2041         // why we bother doing this is that Qt seemingly can get into a state
2042         // where its builds up an essentially unbounded queue of signals,
2043         // consuming more and more memory, and there's no good way of collapsing
2044         // user-defined signals or limiting the length of the queue.
2045         if (transition_names_updated_callback) {
2046                 vector<string> transition_names = global_mixer->get_transition_names();
2047                 bool changed = false;
2048                 if (transition_names.size() != last_transition_names.size()) {
2049                         changed = true;
2050                 } else {
2051                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2052                                 if (transition_names[i] != last_transition_names[i]) {
2053                                         changed = true;
2054                                         break;
2055                                 }
2056                         }
2057                 }
2058                 if (changed) {
2059                         transition_names_updated_callback(transition_names);
2060                         last_transition_names = transition_names;
2061                 }
2062         }
2063         if (name_updated_callback) {
2064                 string name = global_mixer->get_channel_name(channel);
2065                 if (name != last_name) {
2066                         name_updated_callback(name);
2067                         last_name = name;
2068                 }
2069         }
2070         if (color_updated_callback) {
2071                 string color = global_mixer->get_channel_color(channel);
2072                 if (color != last_color) {
2073                         color_updated_callback(color);
2074                         last_color = color;
2075                 }
2076         }
2077 }
2078
2079 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2080 {
2081         lock_guard<mutex> lock(frame_mutex);
2082         if (!has_current_frame && !has_ready_frame) {
2083                 return false;
2084         }
2085
2086         if (has_current_frame && has_ready_frame) {
2087                 // We have a new ready frame. Toss the current one.
2088                 parent->release_display_frame(&current_frame);
2089                 has_current_frame = false;
2090         }
2091         if (has_ready_frame) {
2092                 assert(!has_current_frame);
2093                 current_frame = move(ready_frame);
2094                 ready_frame.ready_fence.reset();  // Drop the refcount.
2095                 ready_frame.input_frames.clear();  // Drop the refcounts.
2096                 has_current_frame = true;
2097                 has_ready_frame = false;
2098         }
2099
2100         *frame = current_frame;
2101         return true;
2102 }
2103
2104 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2105 {
2106         lock_guard<mutex> lock(frame_mutex);
2107         new_frame_ready_callbacks[key] = callback;
2108 }
2109
2110 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2111 {
2112         lock_guard<mutex> lock(frame_mutex);
2113         new_frame_ready_callbacks.erase(key);
2114 }
2115
2116 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2117 {
2118         transition_names_updated_callback = callback;
2119 }
2120
2121 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2122 {
2123         name_updated_callback = callback;
2124 }
2125
2126 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2127 {
2128         color_updated_callback = callback;
2129 }
2130
2131 #ifdef HAVE_SRT
2132 void Mixer::start_srt()
2133 {
2134         SRTSOCKET sock = srt_socket(AF_INET6, 0, 0);
2135         sockaddr_in6 addr;
2136         memset(&addr, 0, sizeof(addr));
2137         addr.sin6_family = AF_INET6;
2138         addr.sin6_port = htons(global_flags.srt_port);
2139
2140         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2141         if (err != 0) {
2142                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2143                 abort();
2144         }
2145         err = srt_listen(sock, MAX_VIDEO_CARDS);
2146         if (err != 0) {
2147                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2148                 abort();
2149         }
2150
2151         srt_thread = thread([this, sock] {
2152                 sockaddr_in6 addr;
2153                 for ( ;; ) {
2154                         int sa_len = sizeof(addr);
2155                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2156                         if (should_quit) {
2157                                 if (clientsock != -1) {
2158                                         srt_close(clientsock);
2159                                 }
2160                                 break;
2161                         }
2162                         lock_guard<mutex> lock(hotplug_mutex);
2163                         hotplugged_srt_cards.push_back(clientsock);
2164                 }
2165                 srt_close(sock);
2166         });
2167 }
2168 #endif
2169
2170 #ifdef HAVE_SRT
2171 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2172 {
2173         SRT_TRACEBSTATS stats;
2174         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2175
2176         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2177         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2178         card->metric_srt_sent_bytes = stats.byteSentTotal;
2179         card->metric_srt_received_bytes = stats.byteRecvTotal;
2180         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2181         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2182         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2183         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2184         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2185         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2186         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2187         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2188         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2189         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2190         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2191         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2192         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2193         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2194         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2195         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2196         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2197         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2198         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2199         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2200
2201         // Gauges.
2202         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2203         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2204         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2205         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2206         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2207         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2208         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2209         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2210         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2211         card->metric_srt_mss_bytes = stats.byteMSS;
2212         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2213         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2214         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2215         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2216         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2217         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2218         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2219         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2220 }
2221 #endif
2222
2223 string Mixer::description_for_card(unsigned card_index)
2224 {
2225         CaptureCard *card = &cards[card_index];
2226         if (card->capture == nullptr) {
2227                 // Should never be called for inactive cards, but OK.
2228                 char buf[256];
2229                 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2230                 return buf;
2231         }
2232         if (card->type != CardType::FFMPEG_INPUT) {
2233                 char buf[256];
2234                 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2235                 return buf;
2236         }
2237
2238         // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2239         // since it's not too obvious for the user that they are “cards”.
2240         unsigned ffmpeg_index = 0;
2241         for (unsigned i = 0; i < card_index; ++i) {
2242                 CaptureCard *other_card = &cards[i];
2243                 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2244                         ++ffmpeg_index;
2245                 }
2246         }
2247         char buf[256];
2248         snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2249         return buf;
2250 }
2251
2252 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2253 {
2254 #ifdef HAVE_SRT
2255         if (card->type == CardType::FFMPEG_INPUT) {
2256                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2257                 return srt_sock != -1;
2258         }
2259 #endif
2260         return false;
2261 }
2262
2263 mutex RefCountedGLsync::fence_lock;