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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect.h>
   8 #include <movit/effect_chain.h>
   9 #include <movit/effect_util.h>
  10 #include <movit/flat_input.h>
  11 #include <movit/image_format.h>
  12 #include <movit/init.h>
  13 #include <movit/resource_pool.h>
  14 #include <pthread.h>
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <algorithm>
  19 #include <chrono>
  20 #include <condition_variable>
  21 #include <cstddef>
  22 #include <cstdint>
  23 #include <memory>
  24 #include <mutex>
  25 #include <ratio>
  26 #include <string>
  27 #include <thread>
  28 #include <utility>
  29 #include <vector>
  30
  31 #include "DeckLinkAPI.h"
  32 #include "LinuxCOM.h"
  33 #include "alsa_output.h"
  34 #include "basic_stats.h"
  35 #include "bmusb/bmusb.h"
  36 #include "bmusb/fake_capture.h"
  37 #ifdef HAVE_CEF
  38 #include "cef_capture.h"
  39 #endif
  40 #include "chroma_subsampler.h"
  41 #include "shared/context.h"
  42 #include "decklink_capture.h"
  43 #include "decklink_output.h"
  44 #include "decklink_util.h"
  45 #include "defs.h"
  46 #include "shared/disk_space_estimator.h"
  47 #include "ffmpeg_capture.h"
  48 #include "flags.h"
  49 #include "image_input.h"
  50 #include "input_mapping.h"
  51 #include "shared/metrics.h"
  52 #include "shared/va_display.h"
  53 #include "mjpeg_encoder.h"
  54 #include "pbo_frame_allocator.h"
  55 #include "shared/ref_counted_gl_sync.h"
  56 #include "resampling_queue.h"
  57 #include "shared/timebase.h"
  58 #include "timecode_renderer.h"
  59 #include "v210_converter.h"
  60 #include "video_encoder.h"
  61
  62 #undef Status
  63 #include <google/protobuf/util/json_util.h>
  64 #include "json.pb.h"
  65
  66 #ifdef HAVE_SRT
  67 // Must come after CEF, since it includes <syslog.h>, which has #defines
  68 // that conflict with CEF logging constants.
  69 #include <srt/srt.h>
  70 #endif
  71
  72 class IDeckLink;
  73 class QOpenGLContext;
  74
  75 using namespace movit;
  76 using namespace std;
  77 using namespace std::chrono;
  78 using namespace std::placeholders;
  79 using namespace bmusb;
  80
  81 Mixer *global_mixer = nullptr;
  82
  83 namespace {
  84
  85 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  86 {
  87         if (interlaced) {
  88                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  89                         input_state->buffered_frames[card_index][frame_num] =
  90                                 input_state->buffered_frames[card_index][frame_num - 1];
  91                 }
  92                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  93         } else {
  94                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  95                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  96                 }
  97         }
  98 }
  99
 100 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
 101 {
 102         bool first;
 103         switch (userdata->pixel_format) {
 104         case PixelFormat_10BitYCbCr:
 105                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
 106                 break;
 107         case PixelFormat_8BitYCbCr:
 108                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
 109                 break;
 110         case PixelFormat_8BitBGRA:
 111                 first = userdata->tex_rgba[field] == 0;
 112                 break;
 113         case PixelFormat_8BitYCbCrPlanar:
 114                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 115                 break;
 116         default:
 117                 assert(false);
 118         }
 119
 120         const bool recreate_main_texture =
 121                 first ||
 122                 width != userdata->last_width[field] ||
 123                 height != userdata->last_height[field] ||
 124                 cbcr_width != userdata->last_cbcr_width[field] ||
 125                 cbcr_height != userdata->last_cbcr_height[field];
 126         const bool recreate_v210_texture =
 127                 global_flags.ten_bit_input &&
 128                 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
 129
 130         if (recreate_main_texture) {
 131                 // We changed resolution since last use of this texture, so we need to create
 132                 // a new object. Note that this each card has its own PBOFrameAllocator,
 133                 // we don't need to worry about these flip-flopping between resolutions.
 134                 switch (userdata->pixel_format) {
 135                 case PixelFormat_10BitYCbCr:
 136                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 137                         check_error();
 138                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 139                         check_error();
 140                         break;
 141                 case PixelFormat_8BitYCbCr: {
 142                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 143                         check_error();
 144                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 145                         check_error();
 146                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 147                         check_error();
 148                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 149                         check_error();
 150                         break;
 151                 }
 152                 case PixelFormat_8BitYCbCrPlanar: {
 153                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 154                         check_error();
 155                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 156                         check_error();
 157                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 158                         check_error();
 159                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 160                         check_error();
 161                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 162                         check_error();
 163                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 164                         check_error();
 165                         break;
 166                 }
 167                 case PixelFormat_8BitBGRA:
 168                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 169                         check_error();
 170                         // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
 171                         glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 172                         check_error();
 173                         break;
 174                 default:
 175                         assert(false);
 176                 }
 177                 userdata->last_width[field] = width;
 178                 userdata->last_height[field] = height;
 179                 userdata->last_cbcr_width[field] = cbcr_width;
 180                 userdata->last_cbcr_height[field] = cbcr_height;
 181         }
 182         if (recreate_v210_texture) {
 183                 // Same as above; we need to recreate the texture.
 184                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 185                 check_error();
 186                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 187                 check_error();
 188                 userdata->last_v210_width[field] = v210_width;
 189                 userdata->last_height[field] = height;
 190         }
 191 }
 192
 193 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 194 {
 195         if (interlaced_stride) {
 196                 stride *= 2;
 197         }
 198         if (global_flags.flush_pbos) {
 199                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 200                 check_error();
 201         }
 202
 203         glBindTexture(GL_TEXTURE_2D, tex);
 204         check_error();
 205         if (interlaced_stride) {
 206                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 207                 check_error();
 208         } else {
 209                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 210                 check_error();
 211         }
 212
 213         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 214         check_error();
 215         glBindTexture(GL_TEXTURE_2D, 0);
 216         check_error();
 217         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 218         check_error();
 219 }
 220
 221 }  // namespace
 222
 223 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 224 {
 225         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 226         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 227 }
 228
 229 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 230 {
 231         global_metrics.remove("input_underestimated_jitter_frames", labels);
 232         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 233 }
 234
 235 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 236 {
 237         if (expected_timestamp > steady_clock::time_point::min()) {
 238                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 239                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 240                 history.push_back(orders.insert(jitter_seconds));
 241                 if (jitter_seconds > estimate_max_jitter()) {
 242                         ++metric_input_underestimated_jitter_frames;
 243                 }
 244
 245                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 246
 247                 if (history.size() > history_length) {
 248                         orders.erase(history.front());
 249                         history.pop_front();
 250                 }
 251                 assert(history.size() <= history_length);
 252         }
 253         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 254 }
 255
 256 double JitterHistory::estimate_max_jitter() const
 257 {
 258         if (orders.empty()) {
 259                 return 0.0;
 260         }
 261         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 262         if (percentile <= 0.5) {
 263                 return *next(orders.begin(), elem_idx) * multiplier;
 264         } else {
 265                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 266         }
 267 }
 268
 269 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 270 {
 271         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 272 }
 273
 274 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 275 {
 276         global_metrics.remove("input_queue_safe_length_frames", labels);
 277 }
 278
 279 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 280                                       steady_clock::time_point expected_next_frame,
 281                                       int64_t input_frame_duration,
 282                                       int64_t master_frame_duration,
 283                                       double max_input_card_jitter_seconds,
 284                                       double max_master_card_jitter_seconds)
 285 {
 286         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 287         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 288
 289         // Figure out when we can expect the next frame for this card, assuming
 290         // worst-case jitter (ie., the frame is maximally late).
 291         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 292
 293         // How many times are the master card expected to tick in that time?
 294         // We assume the master clock has worst-case jitter but not any rate
 295         // discrepancy, ie., it ticks as early as possible every time, but not
 296         // cumulatively.
 297         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 298
 299         // As a special case, if the master card ticks faster than the input card,
 300         // we expect the queue to drain by itself even without dropping. But if
 301         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 302         // go slowly enough that the effect wouldn't really be appreciable.
 303         // We account for this by looking at the situation five frames ahead,
 304         // assuming everything else is the same.
 305         double frames_allowed;
 306         if (master_frame_duration < input_frame_duration) {
 307                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 308         } else {
 309                 frames_allowed = frames_needed;
 310         }
 311
 312         safe_queue_length = max<int>(floor(frames_allowed), 0);
 313         metric_input_queue_safe_length_frames = safe_queue_length;
 314 }
 315
 316 Mixer::Mixer(const QSurfaceFormat &format)
 317         : httpd(),
 318           mixer_surface(create_surface(format)),
 319           h264_encoder_surface(create_surface(format)),
 320           decklink_output_surface(create_surface(format)),
 321           image_update_surface(create_surface(format))
 322 {
 323         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 324         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 325         check_error();
 326
 327         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 328             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 329                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 330                 exit(1);
 331         }
 332
 333         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 334         // will be halved when sampling them, and we need to compensate here.
 335         movit_texel_subpixel_precision /= 2.0;
 336
 337         resource_pool.reset(new ResourcePool);
 338         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 339                 output_channel[i].parent = this;
 340                 output_channel[i].channel = i;
 341         }
 342
 343         ImageFormat inout_format;
 344         inout_format.color_space = COLORSPACE_sRGB;
 345         inout_format.gamma_curve = GAMMA_sRGB;
 346
 347         // Matches the 4:2:0 format created by the main chain.
 348         YCbCrFormat ycbcr_format;
 349         ycbcr_format.chroma_subsampling_x = 2;
 350         ycbcr_format.chroma_subsampling_y = 2;
 351         if (global_flags.ycbcr_rec709_coefficients) {
 352                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 353         } else {
 354                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 355         }
 356         ycbcr_format.full_range = false;
 357         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 358         ycbcr_format.cb_x_position = 0.0f;
 359         ycbcr_format.cr_x_position = 0.0f;
 360         ycbcr_format.cb_y_position = 0.5f;
 361         ycbcr_format.cr_y_position = 0.5f;
 362
 363         // Initialize the neutral colors to sane values.
 364         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 365                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 366         }
 367
 368         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 369         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 370         check_error();
 371         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 372         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 373         display_chain->add_input(display_input);
 374         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 375         display_chain->set_dither_bits(0);  // Don't bother.
 376         display_chain->finalize();
 377
 378         video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, global_flags.width, global_flags.height, &httpd, global_disk_space_estimator));
 379         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 380                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 381         }
 382
 383         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 384         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
 385
 386         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 387         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 388         audio_mixer.reset(new AudioMixer);
 389
 390         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 391         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 392                 char url[256];
 393                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 394                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 395         }
 396
 397         // Start listening for clients only once VideoEncoder has written its header, if any.
 398         httpd.start(global_flags.http_port);
 399
 400         // First try initializing the then PCI devices, then USB, then
 401         // fill up with fake cards until we have the desired number of cards.
 402         unsigned num_pci_devices = 0;
 403         unsigned card_index = 0;
 404
 405         {
 406                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 407                 if (decklink_iterator != nullptr) {
 408                         for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
 409                                 IDeckLink *decklink;
 410                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 411                                         break;
 412                                 }
 413
 414                                 if (!decklink_card_is_active(decklink, card_index)) {
 415                                         fprintf(stderr, "DeckLink card %u is inactive in current profile, skipping (try changing it in Desktop Video Setup)\n", card_index);
 416                                         decklink->Release();
 417                                         continue;
 418                                 }
 419
 420                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 421                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 422                                 if (!output->set_device(decklink)) {
 423                                         delete output;
 424                                         output = nullptr;
 425                                 }
 426                                 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
 427                                 ++num_pci_devices;
 428                         }
 429                         decklink_iterator->Release();
 430                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 431                 } else {
 432                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 433                 }
 434         }
 435
 436         unsigned num_usb_devices = BMUSBCapture::num_cards();
 437         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) {
 438                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 439                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 440                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
 441         }
 442         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 443
 444         // Fill up with fake cards for as long as we can, so that the FFmpeg
 445         // and HTML cards always come last.
 446         unsigned num_fake_cards = 0;
 447 #ifdef HAVE_CEF
 448         size_t num_html_inputs = theme->get_html_inputs().size();
 449 #else
 450         size_t num_html_inputs = 0;
 451 #endif
 452         for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
 453                 // Only bother to activate fake capture cards to satisfy the minimum.
 454                 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
 455                 if (is_active) {
 456                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 457                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 458                         ++num_fake_cards;
 459                 } else {
 460                         configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 461                 }
 462         }
 463
 464         if (num_fake_cards > 0) {
 465                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 466         }
 467
 468         // Initialize all video inputs the theme asked for.
 469         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 470                 if (card_index >= MAX_VIDEO_CARDS) {
 471                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 472                         abort();
 473                 }
 474                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 475                 video_inputs[video_card_index]->set_card_index(card_index);
 476         }
 477         num_video_inputs = video_inputs.size();
 478
 479 #ifdef HAVE_CEF
 480         // Same, for HTML inputs.
 481         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 482         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 483                 if (card_index >= MAX_VIDEO_CARDS) {
 484                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 485                         abort();
 486                 }
 487                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 488                 html_inputs[html_card_index]->set_card_index(card_index);
 489         }
 490         num_html_inputs = html_inputs.size();
 491 #endif
 492
 493         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 494         BMUSBCapture::start_bm_thread();
 495
 496 #ifdef HAVE_SRT
 497         if (global_flags.srt_port >= 0) {
 498                 start_srt();
 499         }
 500 #endif
 501
 502         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 503                 cards[card_index].queue_length_policy.reset(card_index);
 504         }
 505
 506         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 507
 508         if (global_flags.ten_bit_input) {
 509                 if (!v210Converter::has_hardware_support()) {
 510                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 511                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 512                         abort();
 513                 }
 514                 v210_converter.reset(new v210Converter());
 515
 516                 // These are all the widths listed in the Blackmagic SDK documentation
 517                 // (section 2.7.3, “Display Modes”).
 518                 v210_converter->precompile_shader(720);
 519                 v210_converter->precompile_shader(1280);
 520                 v210_converter->precompile_shader(1920);
 521                 v210_converter->precompile_shader(2048);
 522                 v210_converter->precompile_shader(3840);
 523                 v210_converter->precompile_shader(4096);
 524         }
 525         if (global_flags.ten_bit_output) {
 526                 if (!v210Converter::has_hardware_support()) {
 527                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 528                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 529                         abort();
 530                 }
 531         }
 532
 533         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 534         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 535         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 536
 537         if (global_flags.enable_alsa_output) {
 538                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 539         }
 540         if (global_flags.output_card != -1) {
 541                 desired_output_card_index = global_flags.output_card;
 542                 set_output_card_internal(global_flags.output_card);
 543         }
 544
 545         output_jitter_history.register_metrics({{ "card", "output" }});
 546
 547         ImageInput::start_update_thread(image_update_surface);
 548 }
 549
 550 Mixer::~Mixer()
 551 {
 552         ImageInput::end_update_thread();
 553
 554         if (mjpeg_encoder != nullptr) {
 555                 mjpeg_encoder->stop();
 556         }
 557         httpd.stop();
 558         BMUSBCapture::stop_bm_thread();
 559
 560         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 561                 if (cards[card_index].capture != nullptr) {  // Active.
 562                         cards[card_index].capture->stop_dequeue_thread();
 563                 }
 564                 if (cards[card_index].output) {
 565                         cards[card_index].output->end_output();
 566                         cards[card_index].output.reset();
 567                 }
 568         }
 569
 570         video_encoder.reset(nullptr);
 571 }
 572
 573 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 574 {
 575         bool is_active = capture != nullptr;
 576         if (is_active) {
 577                 printf("Configuring card %d...\n", card_index);
 578         } else {
 579                 assert(card_type == CardType::FAKE_CAPTURE);
 580         }
 581
 582         CaptureCard *card = &cards[card_index];
 583         if (card->capture != nullptr) {
 584                 card_mutex.unlock();  // The dequeue thread could be waiting for bm_frame().
 585                 card->capture->stop_dequeue_thread();
 586                 card_mutex.lock();
 587         }
 588         card->capture.reset(capture);
 589         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 590         if (card->is_fake_capture) {
 591                 card->fake_capture_counter = fake_capture_counter++;
 592         }
 593         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 594         card->may_have_dropped_last_frame = false;
 595         card->type = card_type;
 596         if (card->output.get() != output) {
 597                 card->output.reset(output);
 598         }
 599
 600         PixelFormat pixel_format;
 601         if (card_type == CardType::FFMPEG_INPUT) {
 602                 pixel_format = capture->get_current_pixel_format();
 603         } else if (card_type == CardType::CEF_INPUT) {
 604                 pixel_format = PixelFormat_8BitBGRA;
 605         } else if (global_flags.ten_bit_input) {
 606                 pixel_format = PixelFormat_10BitYCbCr;
 607         } else {
 608                 pixel_format = PixelFormat_8BitYCbCr;
 609         }
 610
 611         if (is_active) {
 612                 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 613                 if (card->frame_allocator == nullptr) {
 614                         card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 615                 } else {
 616                         // The format could have changed, but we cannot reset the allocator
 617                         // and create a new one from scratch, since there may be allocated
 618                         // frames from it that expect to call release_frame() on it.
 619                         // Instead, ask the allocator to create new frames for us and discard
 620                         // any old ones as they come back. This takes the mutex while
 621                         // allocating, but nothing should really be sending frames in there
 622                         // right now anyway (start_bm_capture() has not been called yet).
 623                         card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 624                 }
 625                 card->capture->set_video_frame_allocator(card->frame_allocator.get());
 626                 if (card->surface == nullptr) {
 627                         card->surface = create_surface_with_same_format(mixer_surface);
 628                 }
 629                 while (!card->new_frames.empty()) card->new_frames.pop_front();
 630                 card->last_timecode = -1;
 631                 card->capture->set_pixel_format(pixel_format);
 632                 card->capture->configure_card();
 633
 634                 // NOTE: start_bm_capture() happens in thread_func().
 635         }
 636
 637         if (is_srt_card) {
 638                 assert(card_type == CardType::FFMPEG_INPUT);
 639         }
 640
 641         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 642         unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
 643         if (is_active) {
 644                 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
 645         } else {
 646                 // Note: Keeps the previous name, if any.
 647                 char name[32];
 648                 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
 649                 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
 650         }
 651         audio_mixer->reset_resampler(device);
 652         audio_mixer->trigger_state_changed_callback();
 653
 654         // Unregister old metrics, if any.
 655         if (!card->labels.empty()) {
 656                 const vector<pair<string, string>> &labels = card->labels;
 657                 card->jitter_history.unregister_metrics(labels);
 658                 card->queue_length_policy.unregister_metrics(labels);
 659                 global_metrics.remove_if_exists("input_received_frames", labels);
 660                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 661                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 662                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 663                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 664                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 665
 666                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 667                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 668                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 669                 global_metrics.remove_if_exists("input_width_pixels", labels);
 670                 global_metrics.remove_if_exists("input_height_pixels", labels);
 671                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 672                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 673                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 674
 675                 // SRT metrics.
 676
 677                 // Global measurements (counters).
 678                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 679                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 680                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 681                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 682
 683                 vector<pair<string, string>> packet_labels = card->labels;
 684                 packet_labels.emplace_back("type", "normal");
 685                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 686                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 687
 688                 packet_labels.back().second = "lost";
 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 = "retransmitted";
 693                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 694                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 695
 696                 packet_labels.back().second = "ack";
 697                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 698                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 699
 700                 packet_labels.back().second = "nak";
 701                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 702                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 703
 704                 packet_labels.back().second = "dropped";
 705                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 706                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 707                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 708                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 709
 710                 packet_labels.back().second = "undecryptable";
 711                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 712                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 713
 714                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 715                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 716                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 717                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 718
 719                 // Instant measurements (gauges).
 720                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 721                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 722                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 723                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 724                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 725                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 726                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 727                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 728                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 729                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 730
 731                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 732                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 733                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 734                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 735
 736                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 737                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 738                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 739                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 740         }
 741
 742         if (is_active) {
 743                 // Register metrics.
 744                 vector<pair<string, string>> labels;
 745                 char card_name[64];
 746                 snprintf(card_name, sizeof(card_name), "%d", card_index);
 747                 labels.emplace_back("card", card_name);
 748
 749                 switch (card_type) {
 750                 case CardType::LIVE_CARD:
 751                         labels.emplace_back("cardtype", "live");
 752                         break;
 753                 case CardType::FAKE_CAPTURE:
 754                         labels.emplace_back("cardtype", "fake");
 755                         break;
 756                 case CardType::FFMPEG_INPUT:
 757                         if (is_srt_card) {
 758                                 labels.emplace_back("cardtype", "srt");
 759                         } else {
 760                                 labels.emplace_back("cardtype", "ffmpeg");
 761                         }
 762                         break;
 763                 case CardType::CEF_INPUT:
 764                         labels.emplace_back("cardtype", "cef");
 765                         break;
 766                 default:
 767                         assert(false);
 768                 }
 769                 card->jitter_history.register_metrics(labels);
 770                 card->queue_length_policy.register_metrics(labels);
 771                 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 772                 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 773                 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 774                 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 775                 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 776                 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 777
 778                 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 779                 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 780                 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 781                 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 782                 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 783                 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 784                 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 785                 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 786
 787                 if (is_srt_card) {
 788                         // Global measurements (counters).
 789                         global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 790                         global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 791                         global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 792                         global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 793
 794                         vector<pair<string, string>> packet_labels = labels;
 795                         packet_labels.emplace_back("type", "normal");
 796                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 797                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 798
 799                         packet_labels.back().second = "lost";
 800                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 801                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 802
 803                         packet_labels.back().second = "retransmitted";
 804                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 805                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 806
 807                         packet_labels.back().second = "ack";
 808                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 809                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 810
 811                         packet_labels.back().second = "nak";
 812                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 813                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 814
 815                         packet_labels.back().second = "dropped";
 816                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 817                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 818                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 819                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 820
 821                         packet_labels.back().second = "undecryptable";
 822                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 823                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 824
 825                         global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 826                         global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 827                         global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 828                         global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 829
 830                         // Instant measurements (gauges).
 831                         global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 832                         global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 833                         global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 834                         global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 835                         global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 836                         global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 837                         global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 838                         global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 839                         global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 840                         global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 841
 842                         global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 843                         global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 844                         global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 845                         global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 846
 847                         global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 848                         global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 849                         global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 850                         global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 851                 }
 852
 853                 card->labels = labels;
 854         } else {
 855                 card->labels.clear();
 856         }
 857 }
 858
 859 void Mixer::set_output_card_internal(int card_index)
 860 {
 861         // We don't really need to take card_mutex, since we're in the mixer
 862         // thread and don't mess with any queues (which is the only thing that happens
 863         // from other threads), but it's probably the safest in the long run.
 864         unique_lock<mutex> lock(card_mutex);
 865         if (output_card_index != -1) {
 866                 // Switch the old card from output to input.
 867                 CaptureCard *old_card = &cards[output_card_index];
 868                 old_card->output->end_output();
 869
 870                 // Stop the fake card that we put into place.
 871                 // This needs to _not_ happen under the mutex, to avoid deadlock
 872                 // (delivering the last frame needs to take the mutex).
 873                 CaptureInterface *fake_capture = old_card->capture.get();
 874                 lock.unlock();
 875                 fake_capture->stop_dequeue_thread();
 876                 lock.lock();
 877                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 878                 old_card->is_fake_capture = false;
 879                 old_card->capture->start_bm_capture();
 880         }
 881         if (card_index != -1) {
 882                 CaptureCard *card = &cards[card_index];
 883                 CaptureInterface *capture = card->capture.get();
 884                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 885                 // several seconds to complete (blocking on DisableVideoInput);
 886                 // see if we can maybe do it asynchronously.
 887                 lock.unlock();
 888                 capture->stop_dequeue_thread();
 889                 lock.lock();
 890                 card->parked_capture = move(card->capture);
 891                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 892                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
 893                 card->queue_length_policy.reset(card_index);
 894                 card->capture->start_bm_capture();
 895                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 896                 card->output->start_output(desired_output_video_mode, pts_int);
 897         }
 898         output_card_index = card_index;
 899         output_jitter_history.clear();
 900 }
 901
 902 namespace {
 903
 904 int unwrap_timecode(uint16_t current_wrapped, int last)
 905 {
 906         uint16_t last_wrapped = last & 0xffff;
 907         if (current_wrapped > last_wrapped) {
 908                 return (last & ~0xffff) | current_wrapped;
 909         } else {
 910                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 911         }
 912 }
 913
 914 }  // namespace
 915
 916 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 917                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 918                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 919 {
 920         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 921         CaptureCard *card = &cards[card_index];
 922
 923         ++card->metric_input_received_frames;
 924         card->metric_input_has_signal_bool = video_format.has_signal;
 925         card->metric_input_is_connected_bool = video_format.is_connected;
 926         card->metric_input_interlaced_bool = video_format.interlaced;
 927         card->metric_input_width_pixels = video_format.width;
 928         card->metric_input_height_pixels = video_format.height;
 929         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 930         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 931         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 932
 933         if (is_mode_scanning[card_index]) {
 934                 if (video_format.has_signal) {
 935                         // Found a stable signal, so stop scanning.
 936                         is_mode_scanning[card_index] = false;
 937                 } else {
 938                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 939                         steady_clock::time_point now = steady_clock::now();
 940                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 941                         if (sec_since_last_switch > switch_time_s) {
 942                                 // It isn't this mode; try the next one.
 943                                 mode_scanlist_index[card_index]++;
 944                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 945                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 946                                 last_mode_scan_change[card_index] = now;
 947                         }
 948                 }
 949         }
 950
 951         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 952         assert(frame_length > 0);
 953
 954         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;
 955         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 956                 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",
 957                         description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
 958                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 959                 if (video_frame.owner) {
 960                         video_frame.owner->release_frame(video_frame);
 961                 }
 962                 if (audio_frame.owner) {
 963                         audio_frame.owner->release_frame(audio_frame);
 964                 }
 965                 return;
 966         }
 967
 968         int dropped_frames = 0;
 969         if (card->last_timecode != -1) {
 970                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 971         }
 972
 973         // Number of samples per frame if we need to insert silence.
 974         // (Could be nonintegral, but resampling will save us then.)
 975         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 976
 977         if (dropped_frames > MAX_FPS * 2) {
 978                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 979                         description_for_card(card_index).c_str(), card->last_timecode, timecode);
 980                 audio_mixer->reset_resampler(device);
 981                 dropped_frames = 0;
 982                 ++card->metric_input_resets;
 983         } else if (dropped_frames > 0) {
 984                 // Insert silence as needed.
 985                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 986                         description_for_card(card_index).c_str(), dropped_frames, timecode);
 987                 card->metric_input_dropped_frames_error += dropped_frames;
 988
 989                 bool success;
 990                 do {
 991                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 992                 } while (!success);
 993         }
 994
 995         if (num_samples > 0) {
 996                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
 997
 998                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
 999                 // just gets dropped for now.
1000                 //
1001                 // Only bother doing MJPEG encoding if there are any connected clients
1002                 // that want the stream.
1003                 if (httpd.get_num_connected_multicam_clients() > 0 ||
1004                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
1005                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
1006                         lock_guard<mutex> lock(card_mutex);
1007                         if (card->new_raw_audio.empty()) {
1008                                 card->new_raw_audio = move(converted_samples);
1009                         } else {
1010                                 // For raw audio, we don't really synchronize audio and video;
1011                                 // we just put the audio in frame by frame, and if a video frame is
1012                                 // dropped, we still keep the audio, which means it will be added
1013                                 // to the beginning of the next frame. It would probably be better
1014                                 // to move the audio pts earlier to show this, but most players can
1015                                 // live with some jitter, and in a lot of ways, it's much nicer for
1016                                 // Futatabi to have all audio locked to a video frame.
1017                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1018
1019                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1020                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1021                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1022                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1023                                 }
1024                         }
1025                 }
1026         }
1027
1028         // Done with the audio, so release it.
1029         if (audio_frame.owner) {
1030                 audio_frame.owner->release_frame(audio_frame);
1031         }
1032
1033         card->last_timecode = timecode;
1034
1035         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1036         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1037                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1038                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1039                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1040         }
1041 #ifdef HAVE_SRT
1042         if (card->type == CardType::FFMPEG_INPUT) {
1043                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1044                 if (srt_sock != -1) {
1045                         update_srt_stats(srt_sock, card);
1046                 }
1047         }
1048 #endif
1049
1050         size_t y_offset, cbcr_offset;
1051         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1052         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1053                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1054                 assert(card->type == CardType::FFMPEG_INPUT);
1055                 assert(video_offset == 0);
1056                 expected_length = video_frame.len;
1057
1058                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1059                 y_offset = 0;
1060                 cbcr_offset = video_format.width * video_format.height;
1061         } else {
1062                 // All the other Y'CbCr formats are 4:2:2.
1063                 y_offset = video_frame.size / 2 + video_offset / 2;
1064                 cbcr_offset = video_offset / 2;
1065         }
1066         if (video_frame.len - video_offset == 0 ||
1067             video_frame.len - video_offset != expected_length) {
1068                 if (video_frame.len != 0) {
1069                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1070                                 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1071                 }
1072                 if (video_frame.owner) {
1073                         video_frame.owner->release_frame(video_frame);
1074                 }
1075
1076                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1077                 // so that pts can go up accordingly.
1078                 {
1079                         lock_guard<mutex> lock(card_mutex);
1080                         CaptureCard::NewFrame new_frame;
1081                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1082                         new_frame.length = frame_length;
1083                         new_frame.interlaced = false;
1084                         new_frame.dropped_frames = dropped_frames;
1085                         new_frame.received_timestamp = video_frame.received_timestamp;
1086                         card->new_frames.push_back(move(new_frame));
1087                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1088                 }
1089                 card->new_frames_changed.notify_all();
1090                 return;
1091         }
1092
1093         unsigned num_fields = video_format.interlaced ? 2 : 1;
1094         steady_clock::time_point frame_upload_start;
1095         if (video_format.interlaced) {
1096                 // Send the two fields along as separate frames; the other side will need to add
1097                 // a deinterlacer to actually get this right.
1098                 assert(video_format.height % 2 == 0);
1099                 video_format.height /= 2;
1100                 assert(frame_length % 2 == 0);
1101                 frame_length /= 2;
1102                 num_fields = 2;
1103                 frame_upload_start = steady_clock::now();
1104         }
1105         assert(userdata != nullptr);
1106         userdata->last_interlaced = video_format.interlaced;
1107         userdata->last_has_signal = video_format.has_signal;
1108         userdata->last_is_connected = video_format.is_connected;
1109         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1110         userdata->last_frame_rate_den = video_format.frame_rate_den;
1111         RefCountedFrame frame(video_frame);
1112
1113         // Send the frames on to the main thread, which will upload and process htem.
1114         // It is entirely possible to upload them in the same thread (and it might even be
1115         // faster, depending on the GPU and driver), but it appears to be trickling
1116         // driver bugs very easily.
1117         //
1118         // Note that this means we must hold on to the actual frame data in <userdata>
1119         // until the upload is done, but we hold on to <frame> much longer than that
1120         // (in fact, all the way until we no longer use the texture in rendering).
1121         for (unsigned field = 0; field < num_fields; ++field) {
1122                 if (field == 1) {
1123                         // Don't upload the second field as fast as we can; wait until
1124                         // the field time has approximately passed. (Otherwise, we could
1125                         // get timing jitter against the other sources, and possibly also
1126                         // against the video display, although the latter is not as critical.)
1127                         // This requires our system clock to be reasonably close to the
1128                         // video clock, but that's not an unreasonable assumption.
1129                         steady_clock::time_point second_field_start = frame_upload_start +
1130                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1131                         this_thread::sleep_until(second_field_start);
1132                 }
1133
1134                 {
1135                         lock_guard<mutex> lock(card_mutex);
1136                         CaptureCard::NewFrame new_frame;
1137                         new_frame.frame = frame;
1138                         new_frame.length = frame_length;
1139                         new_frame.field = field;
1140                         new_frame.interlaced = video_format.interlaced;
1141                         new_frame.dropped_frames = dropped_frames;
1142                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1143                         new_frame.video_format = video_format;
1144                         new_frame.video_offset = video_offset;
1145                         new_frame.y_offset = y_offset;
1146                         new_frame.cbcr_offset = cbcr_offset;
1147                         new_frame.texture_uploaded = false;
1148                         if (card->type == CardType::FFMPEG_INPUT) {
1149                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1150                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1151                         }
1152                         card->new_frames.push_back(move(new_frame));
1153                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1154                         card->may_have_dropped_last_frame = false;
1155                 }
1156                 card->new_frames_changed.notify_all();
1157         }
1158 }
1159
1160 void Mixer::upload_texture_for_frame(
1161         int field, bmusb::VideoFormat video_format,
1162         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1163 {
1164         size_t cbcr_width, cbcr_height;
1165         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1166                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1167                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1168         } else {
1169                 // All the other Y'CbCr formats are 4:2:2.
1170                 cbcr_width = video_format.width / 2;
1171                 cbcr_height = video_format.height;
1172         }
1173
1174         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1175         if (video_format.interlaced) {
1176                 cbcr_height /= 2;
1177         }
1178
1179         unsigned field_start_line;
1180         if (field == 1) {
1181                 field_start_line = video_format.second_field_start;
1182         } else {
1183                 field_start_line = video_format.extra_lines_top;
1184         }
1185
1186         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1187         size_t v210_width = video_format.stride / sizeof(uint32_t);
1188         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1189
1190         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1191         check_error();
1192
1193         switch (userdata->pixel_format) {
1194                 case PixelFormat_10BitYCbCr: {
1195                         size_t field_start = video_offset + video_format.stride * field_start_line;
1196                         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);
1197                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1198                         break;
1199                 }
1200                 case PixelFormat_8BitYCbCr: {
1201                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1202                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1203
1204                         // Make up our own strides, since we are interleaving.
1205                         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);
1206                         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);
1207                         break;
1208                 }
1209                 case PixelFormat_8BitYCbCrPlanar: {
1210                         assert(field_start_line == 0);  // We don't really support interlaced here.
1211                         size_t field_y_start = y_offset;
1212                         size_t field_cb_start = cbcr_offset;
1213                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1214
1215                         // Make up our own strides, since we are interleaving.
1216                         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);
1217                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1218                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1219                         break;
1220                 }
1221                 case PixelFormat_8BitBGRA: {
1222                         size_t field_start = video_offset + video_format.stride * field_start_line;
1223                         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);
1224                         // These could be asked to deliver mipmaps at any time.
1225                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1226                         check_error();
1227                         glGenerateMipmap(GL_TEXTURE_2D);
1228                         check_error();
1229                         glBindTexture(GL_TEXTURE_2D, 0);
1230                         check_error();
1231                         break;
1232                 }
1233                 default:
1234                         assert(false);
1235         }
1236
1237         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1238         check_error();
1239 }
1240
1241 void Mixer::bm_hotplug_add(libusb_device *dev)
1242 {
1243         lock_guard<mutex> lock(hotplug_mutex);
1244         hotplugged_cards.push_back(dev);
1245 }
1246
1247 void Mixer::bm_hotplug_remove(unsigned card_index)
1248 {
1249         cards[card_index].new_frames_changed.notify_all();
1250 }
1251
1252 void Mixer::thread_func()
1253 {
1254         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1255
1256         eglBindAPI(EGL_OPENGL_API);
1257         QOpenGLContext *context = create_context(mixer_surface);
1258         if (!make_current(context, mixer_surface)) {
1259                 printf("oops\n");
1260                 abort();
1261         }
1262
1263         // Start the actual capture. (We don't want to do it before we're actually ready
1264         // to process output frames.)
1265         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1266                 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1267                         cards[card_index].capture->start_bm_capture();
1268                 }
1269         }
1270
1271         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1272         int stats_dropped_frames = 0;
1273
1274         while (!should_quit) {
1275                 if (desired_output_card_index != output_card_index) {
1276                         set_output_card_internal(desired_output_card_index);
1277                 }
1278                 if (output_card_index != -1 &&
1279                     desired_output_video_mode != output_video_mode) {
1280                         DeckLinkOutput *output = cards[output_card_index].output.get();
1281                         output->end_output();
1282                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1283                         output->start_output(desired_output_video_mode, pts_int);
1284                 }
1285
1286                 {
1287                         lock_guard<mutex> lock(card_mutex);
1288                         handle_hotplugged_cards();
1289                 }
1290
1291                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1292                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1293
1294                 bool master_card_is_output;
1295                 unsigned master_card_index;
1296                 if (output_card_index != -1) {
1297                         master_card_is_output = true;
1298                         master_card_index = output_card_index;
1299                 } else {
1300                         master_card_is_output = false;
1301                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1302                         assert(master_card_index < MAX_VIDEO_CARDS);
1303                 }
1304
1305                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1306                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1307                 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);
1308                 stats_dropped_frames += output_frame_info.dropped_frames;
1309
1310                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1311                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1312                                 continue;
1313                         }
1314                         if (new_frames[card_index].frame->len == 0) {
1315                                 ++new_frames[card_index].dropped_frames;
1316                         }
1317                         if (new_frames[card_index].dropped_frames > 0) {
1318                                 printf("%s dropped %d frames before this\n",
1319                                         description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1320                         }
1321                 }
1322
1323                 // If the first card is reporting a corrupted or otherwise dropped frame,
1324                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1325                 if (!master_card_is_output &&
1326                     new_frames[master_card_index].frame != nullptr &&  // Timeout.
1327                     new_frames[master_card_index].frame->len == 0) {
1328                         ++stats_dropped_frames;
1329                         pts_int += new_frames[master_card_index].length;
1330                         continue;
1331                 }
1332
1333                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1334                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1335                                 continue;
1336
1337                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1338                         assert(new_frame->frame != nullptr);
1339                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1340                         check_error();
1341
1342                         // The new texture might need uploading before use.
1343                         if (!new_frame->texture_uploaded) {
1344                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1345                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1346                                 new_frame->texture_uploaded = true;
1347                         }
1348
1349                         // Only set the white balance if it actually changed. This means that the user
1350                         // is free to override the white balance in a video with no white balance information
1351                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1352                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1353                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1354                         // that the change takes effect on exactly the right frame.
1355                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1356                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1357                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1358                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1359                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1360                         }
1361
1362                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1363                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1364                                 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);
1365                         }
1366
1367                 }
1368
1369                 int64_t frame_duration = output_frame_info.frame_duration;
1370                 render_one_frame(frame_duration);
1371                 {
1372                         lock_guard<mutex> lock(frame_num_mutex);
1373                         ++frame_num;
1374                 }
1375                 frame_num_updated.notify_all();
1376                 pts_int += frame_duration;
1377
1378                 basic_stats.update(frame_num, stats_dropped_frames);
1379                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1380
1381                 if (should_cut.exchange(false)) {  // Test and clear.
1382                         video_encoder->do_cut(frame_num);
1383                 }
1384
1385 #if 0
1386                 // Reset every 100 frames, so that local variations in frame times
1387                 // (especially for the first few frames, when the shaders are
1388                 // compiled etc.) don't make it hard to measure for the entire
1389                 // remaining duration of the program.
1390                 if (frame == 10000) {
1391                         frame = 0;
1392                         start = now;
1393                 }
1394 #endif
1395                 check_error();
1396         }
1397
1398         resource_pool->clean_context();
1399 }
1400
1401 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1402 {
1403         if (output_card_index != -1) {
1404                 // The output card (ie., cards[output_card_index].output) is the master clock,
1405                 // so no input card (ie., cards[card_index].capture) is.
1406                 return false;
1407         }
1408         return (card_index == master_card_index);
1409 }
1410
1411 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1412 {
1413         // Count the number of frames in the queue, including any frames
1414         // we dropped. It's hard to know exactly how we should deal with
1415         // dropped (corrupted) input frames; they don't help our goal of
1416         // avoiding starvation, but they still add to the problem of latency.
1417         // Since dropped frames is going to mean a bump in the signal anyway,
1418         // we err on the side of having more stable latency instead.
1419         unsigned queue_length = 0;
1420         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1421                 queue_length += frame.dropped_frames + 1;
1422         }
1423
1424         // If needed, drop frames until the queue is below the safe limit.
1425         // We prefer to drop from the head, because all else being equal,
1426         // we'd like more recent frames (less latency).
1427         unsigned dropped_frames = 0;
1428         while (queue_length > safe_queue_length) {
1429                 assert(!card->new_frames.empty());
1430                 assert(queue_length > card->new_frames.front().dropped_frames);
1431                 queue_length -= card->new_frames.front().dropped_frames;
1432
1433                 if (queue_length <= safe_queue_length) {
1434                         // No need to drop anything.
1435                         break;
1436                 }
1437
1438                 card->new_frames.pop_front();
1439                 card->new_frames_changed.notify_all();
1440                 --queue_length;
1441                 ++dropped_frames;
1442
1443                 if (queue_length == 0 && card->is_cef_capture) {
1444                         card->may_have_dropped_last_frame = true;
1445                 }
1446         }
1447
1448         card->metric_input_dropped_frames_jitter += dropped_frames;
1449         card->metric_input_queue_length_frames = queue_length;
1450
1451 #if 0
1452         if (dropped_frames > 0) {
1453                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1454                         card_index, dropped_frames);
1455         }
1456 #endif
1457 }
1458
1459 pair<string, string> Mixer::get_channels_json()
1460 {
1461         Channels ret;
1462         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1463                 Channel *channel = ret.add_channel();
1464                 channel->set_index(channel_idx + 2);
1465                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1466                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1467         }
1468         string contents;
1469         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1470         return make_pair(contents, "text/json");
1471 }
1472
1473 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1474 {
1475         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1476 }
1477
1478 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])
1479 {
1480         OutputFrameInfo output_frame_info;
1481         constexpr steady_clock::duration master_card_timeout = milliseconds(200);
1482 start:
1483         unique_lock<mutex> lock(card_mutex, defer_lock);
1484         bool timed_out = false;
1485         if (master_card_is_output) {
1486                 // Clocked to the output, so wait for it to be ready for the next frame.
1487                 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);
1488                 lock.lock();
1489         } else {
1490                 // Wait for the master card to have a new frame.
1491                 output_frame_info.is_preroll = false;
1492                 lock.lock();
1493                 timed_out = !cards[master_card_index].new_frames_changed.wait_for(lock,
1494                         master_card_timeout,
1495                         [this, master_card_index] {
1496                                 return !cards[master_card_index].new_frames.empty() ||
1497                                         cards[master_card_index].capture == nullptr ||
1498                                         cards[master_card_index].capture->get_disconnected();
1499                         });
1500                 if (timed_out) {
1501                         fprintf(stderr, "WARNING: Master card (%s) did not deliver a frame for %u ms, creating a fake one.\n",
1502                                 description_for_card(master_card_index).c_str(),
1503                                 unsigned(duration_cast<milliseconds>(master_card_timeout).count()));
1504                 }
1505         }
1506
1507         if (timed_out) {
1508                 // The master card stalled for 200 ms (possible when it's e.g.
1509                 // an SRT card). Send a frame no matter what; this also makes sure
1510                 // any other cards get to empty their queues, and in general,
1511                 // that we make _some_ sort of forward progress.
1512                 handle_hotplugged_cards();
1513         } else if (master_card_is_output) {
1514                 handle_hotplugged_cards();
1515         } else if (cards[master_card_index].new_frames.empty()) {
1516                 // We were woken up, but not due to a new frame. Deal with it
1517                 // and then restart.
1518                 assert(cards[master_card_index].capture == nullptr ||
1519                        cards[master_card_index].capture->get_disconnected());
1520                 handle_hotplugged_cards();
1521                 lock.unlock();
1522                 goto start;
1523         }
1524
1525         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1526                 CaptureCard *card = &cards[card_index];
1527                 if (card->new_frames.empty()) {  // Starvation.
1528                         ++card->metric_input_duped_frames;
1529 #ifdef HAVE_CEF
1530                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1531                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1532                                 // stream of frames, so we'll have to ask it to repaint the frame
1533                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1534                                 // trim the queue completely away, and cleared when we actually
1535                                 // get a new frame.)
1536                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1537                         }
1538 #endif
1539                 } else {
1540                         new_frames[card_index] = move(card->new_frames.front());
1541                         has_new_frame[card_index] = true;
1542                         card->new_frames.pop_front();
1543                         card->new_frames_changed.notify_all();
1544                 }
1545
1546                 raw_audio[card_index] = move(card->new_raw_audio);
1547         }
1548
1549         if (timed_out) {
1550                 // Pretend the frame happened a while ago and was only processed now,
1551                 // so that we get the duration sort-of right. This isn't ideal.
1552                 output_frame_info.dropped_frames = 0;  // Hard to define, really.
1553                 output_frame_info.frame_duration = lrint(TIMEBASE * duration<double>(master_card_timeout).count());
1554                 output_frame_info.frame_timestamp = steady_clock::now() - master_card_timeout;
1555         } else if (!master_card_is_output) {
1556                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1557                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1558                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1559         }
1560
1561         if (!output_frame_info.is_preroll) {
1562                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1563         }
1564
1565         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1566                 CaptureCard *card = &cards[card_index];
1567                 if (has_new_frame[card_index] &&
1568                     !input_card_is_master_clock(card_index, master_card_index) &&
1569                     !output_frame_info.is_preroll) {
1570                         card->queue_length_policy.update_policy(
1571                                 output_frame_info.frame_timestamp,
1572                                 card->jitter_history.get_expected_next_frame(),
1573                                 new_frames[master_card_index].length,
1574                                 output_frame_info.frame_duration,
1575                                 card->jitter_history.estimate_max_jitter(),
1576                                 output_jitter_history.estimate_max_jitter());
1577                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1578                                                   card->queue_length_policy.get_safe_queue_length()));
1579                 }
1580         }
1581
1582         // This might get off by a fractional sample when changing master card
1583         // between ones with different frame rates, but that's fine.
1584         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1585         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1586         fractional_samples = num_samples_times_timebase % TIMEBASE;
1587         assert(output_frame_info.num_samples >= 0);
1588
1589         if (timed_out) {
1590                 DeviceSpec device{InputSourceType::CAPTURE_CARD, master_card_index};
1591                 bool success;
1592                 do {
1593                         success = audio_mixer->add_silence(device, output_frame_info.num_samples, /*dropped_frames=*/0);
1594                 } while (!success);
1595         }
1596
1597         return output_frame_info;
1598 }
1599
1600 void Mixer::handle_hotplugged_cards()
1601 {
1602         // Check for cards that have been disconnected since last frame.
1603         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1604                 CaptureCard *card = &cards[card_index];
1605                 if (card->capture != nullptr && card->capture->get_disconnected()) {
1606                         bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
1607                         if (is_active) {
1608                                 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1609                                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1610                                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1611                                 card->queue_length_policy.reset(card_index);
1612                                 card->capture->start_bm_capture();
1613                         } else {
1614                                 // NOTE: The theme might end up forcing the card back at some later point
1615                                 // (ie., force_active is false now, but might immediately be true again on
1616                                 // e.g. the next frame). That should be rare, though, so we don't bother
1617                                 // adjusting the message.
1618                                 fprintf(stderr, "Card %u went away, removing. (To keep a fake card, increase --num-cards.)\n", card_index);
1619                                 theme->remove_card(card_index);
1620                                 configure_card(card_index, /*capture=*/nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1621                                 card->queue_length_policy.reset(card_index);
1622                         }
1623                 }
1624         }
1625
1626         // Count how many active cards we already have. Used below to check that we
1627         // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1628         // and HTML “cards” don't count towards this limit.
1629         int num_video_cards = 0;
1630         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1631                 CaptureCard *card = &cards[card_index];
1632                 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1633                         ++num_video_cards;
1634                 }
1635         }
1636
1637         // Check for cards that have been connected since last frame.
1638         vector<libusb_device *> hotplugged_cards_copy;
1639 #ifdef HAVE_SRT
1640         vector<int> hotplugged_srt_cards_copy;
1641 #endif
1642         {
1643                 lock_guard<mutex> lock(hotplug_mutex);
1644                 swap(hotplugged_cards, hotplugged_cards_copy);
1645 #ifdef HAVE_SRT
1646                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1647 #endif
1648         }
1649         for (libusb_device *new_dev : hotplugged_cards_copy) {
1650                 // Look for a fake capture card where we can stick this in.
1651                 int free_card_index = -1;
1652                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1653                         if (cards[card_index].is_fake_capture) {
1654                                 free_card_index = card_index;
1655                                 break;
1656                         }
1657                 }
1658
1659                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1660                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1661                         libusb_unref_device(new_dev);
1662                 } else {
1663                         // BMUSBCapture takes ownership.
1664                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1665                         CaptureCard *card = &cards[free_card_index];
1666                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1667                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1668                         card->queue_length_policy.reset(free_card_index);
1669                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1670                         capture->start_bm_capture();
1671                 }
1672         }
1673
1674 #ifdef HAVE_SRT
1675         // Same, for SRT inputs.
1676         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1677                 char name[256];
1678                 int namelen = sizeof(name);
1679                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1680                 string stream_id(name, namelen);
1681
1682                 // Look for a fake capture card where we can stick this in.
1683                 // Prioritize ones that previously held SRT streams with the
1684                 // same stream ID, if any exist -- and it multiple exist,
1685                 // take the one that disconnected the last.
1686                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1687                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1688                         CaptureCard *card = &cards[card_index];
1689                         if (!card->is_fake_capture) {
1690                                 continue;
1691                         }
1692                         if (first_free_card_index == -1) {
1693                                 first_free_card_index = card_index;
1694                         }
1695                         if (card->last_srt_stream_id == stream_id &&
1696                             (last_matching_free_card_index == -1 ||
1697                              card->fake_capture_counter >
1698                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1699                                 last_matching_free_card_index = card_index;
1700                         }
1701                 }
1702
1703                 const int free_card_index = (last_matching_free_card_index != -1)
1704                         ? last_matching_free_card_index : first_free_card_index;
1705                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1706                         if (stream_id.empty()) {
1707                                 stream_id = "no name";
1708                         }
1709                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1710                         srt_close(sock);
1711                 } else {
1712                         // FFmpegCapture takes ownership.
1713                         if (stream_id.empty()) {
1714                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1715                         } else {
1716                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1717                         }
1718                         CaptureCard *card = &cards[free_card_index];
1719                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1720                         capture->set_card_index(free_card_index);
1721                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1722                         update_srt_stats(sock, card);  // Initial zero stats.
1723                         card->last_srt_stream_id = stream_id;
1724                         card->queue_length_policy.reset(free_card_index);
1725                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1726                         capture->start_bm_capture();
1727                 }
1728         }
1729 #endif
1730
1731         // Finally, newly forced-to-active fake capture cards.
1732         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1733                 CaptureCard *card = &cards[card_index];
1734                 if (card->capture == nullptr && card->force_active) {
1735                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1736                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1737                         card->queue_length_policy.reset(card_index);
1738                         card->capture->start_bm_capture();
1739                 }
1740         }
1741 }
1742
1743
1744 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)
1745 {
1746         // Resample the audio as needed, including from previously dropped frames.
1747         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1748                 const bool dropped_frame = (frame_num != dropped_frames);
1749                 {
1750                         // Signal to the audio thread to process this frame.
1751                         // Note that if the frame is a dropped frame, we signal that
1752                         // we don't want to use this frame as base for adjusting
1753                         // the resampler rate. The reason for this is that the timing
1754                         // of these frames is often way too late; they typically don't
1755                         // “arrive” before we synthesize them. Thus, we could end up
1756                         // in a situation where we have inserted e.g. five audio frames
1757                         // into the queue before we then start pulling five of them
1758                         // back out. This makes ResamplingQueue overestimate the delay,
1759                         // causing undue resampler changes. (We _do_ use the last,
1760                         // non-dropped frame; perhaps we should just discard that as well,
1761                         // since dropped frames are expected to be rare, and it might be
1762                         // better to just wait until we have a slightly more normal situation).
1763                         lock_guard<mutex> lock(audio_mutex);
1764                         bool adjust_rate = !dropped_frame && !is_preroll;
1765                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1766                         audio_task_queue_changed.notify_one();
1767                 }
1768                 if (dropped_frame) {
1769                         // For dropped frames, increase the pts. Note that if the format changed
1770                         // in the meantime, we have no way of detecting that; we just have to
1771                         // assume the frame length is always the same.
1772                         pts_int += length_per_frame;
1773                 }
1774         }
1775 }
1776
1777 void Mixer::render_one_frame(int64_t duration)
1778 {
1779         // Determine the time code for this frame before we start rendering.
1780         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1781         if (display_timecode_on_stdout) {
1782                 printf("Timecode: '%s'\n", timecode_text.c_str());
1783         }
1784
1785         // Update Y'CbCr settings for all cards.
1786         {
1787                 lock_guard<mutex> lock(card_mutex);
1788                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1789                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1790                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1791                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1792                         input_state.full_range[card_index] = interpretation->full_range;
1793                 }
1794         }
1795
1796         // Get the main chain from the theme, and set its state immediately.
1797         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1798         EffectChain *chain = theme_main_chain.chain;
1799         theme_main_chain.setup_chain();
1800         //theme_main_chain.chain->enable_phase_timing(true);
1801
1802         // If HDMI/SDI output is active and the user has requested auto mode,
1803         // its mode overrides the existing Y'CbCr setting for the chain.
1804         YCbCrLumaCoefficients ycbcr_output_coefficients;
1805         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1806                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1807         } else {
1808                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1809         }
1810
1811         // TODO: Reduce the duplication against theme.cpp.
1812         YCbCrFormat output_ycbcr_format;
1813         output_ycbcr_format.chroma_subsampling_x = 1;
1814         output_ycbcr_format.chroma_subsampling_y = 1;
1815         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1816         output_ycbcr_format.full_range = false;
1817         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1818         chain->change_ycbcr_output_format(output_ycbcr_format);
1819
1820         // Render main chain. If we're using zerocopy Quick Sync encoding
1821         // (the default case), we take an extra copy of the created outputs,
1822         // so that we can display it back to the screen later (it's less memory
1823         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1824         // Ideally, we'd like to avoid taking copies and just use the main textures
1825         // for display as well, but they're just views into VA-API memory and must be
1826         // unmapped during encoding, so we can't use them for display, unfortunately.
1827         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1828         GLuint y_copy_tex, cbcr_copy_tex = 0;
1829         GLuint y_display_tex, cbcr_display_tex;
1830         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1831         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1832         const bool is_zerocopy = video_encoder->is_zerocopy();
1833         if (is_zerocopy) {
1834                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1835                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1836                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1837
1838                 y_display_tex = y_copy_tex;
1839                 cbcr_display_tex = cbcr_copy_tex;
1840
1841                 // y_tex and cbcr_tex will be given by VideoEncoder.
1842         } else {
1843                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1844                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1845                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1846
1847                 y_display_tex = y_tex;
1848                 cbcr_display_tex = cbcr_tex;
1849         }
1850
1851         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1852         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1853         assert(got_frame);
1854
1855         GLuint fbo;
1856         if (is_zerocopy) {
1857                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1858         } else {
1859                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1860         }
1861         check_error();
1862         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1863
1864         if (display_timecode_in_stream) {
1865                 // Render the timecode on top.
1866                 timecode_renderer->render_timecode(fbo, timecode_text);
1867         }
1868
1869         resource_pool->release_fbo(fbo);
1870
1871         if (is_zerocopy) {
1872                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1873         } else {
1874                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1875         }
1876         if (output_card_index != -1) {
1877                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1878         }
1879         resource_pool->release_2d_texture(cbcr_full_tex);
1880
1881         // Set the right state for the Y' and CbCr textures we use for display.
1882         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1883         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1884         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1885         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1886         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1887
1888         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1889         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1890         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1891         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1892
1893         RefCountedGLsync fence = video_encoder->end_frame();
1894
1895         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1896         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1897         DisplayFrame live_frame;
1898         live_frame.chain = display_chain.get();
1899         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1900                 display_input->set_texture_num(0, y_display_tex);
1901                 display_input->set_texture_num(1, cbcr_display_tex);
1902         };
1903         live_frame.ready_fence = fence;
1904         live_frame.input_frames = {};
1905         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1906         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1907
1908         // Set up preview and any additional channels.
1909         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1910                 DisplayFrame display_frame;
1911                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1912                 display_frame.chain = move(chain.chain);
1913                 display_frame.setup_chain = move(chain.setup_chain);
1914                 display_frame.ready_fence = fence;
1915                 display_frame.input_frames = move(chain.input_frames);
1916                 display_frame.temp_textures = {};
1917                 output_channel[i].output_frame(move(display_frame));
1918         }
1919 }
1920
1921 void Mixer::audio_thread_func()
1922 {
1923         pthread_setname_np(pthread_self(), "Mixer_Audio");
1924
1925         while (!should_quit) {
1926                 AudioTask task;
1927
1928                 {
1929                         unique_lock<mutex> lock(audio_mutex);
1930                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1931                         if (should_quit) {
1932                                 return;
1933                         }
1934                         task = audio_task_queue.front();
1935                         audio_task_queue.pop();
1936                 }
1937
1938                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1939                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1940                 vector<float> samples_out = audio_mixer->get_output(
1941                         task.frame_timestamp,
1942                         task.num_samples,
1943                         rate_adjustment_policy);
1944
1945                 // Send the samples to the sound card, then add them to the output.
1946                 if (alsa) {
1947                         alsa->write(samples_out);
1948                 }
1949                 if (output_card_index != -1) {
1950                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1951                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1952                 }
1953                 video_encoder->add_audio(task.pts_int, move(samples_out));
1954         }
1955 }
1956
1957 void Mixer::release_display_frame(DisplayFrame *frame)
1958 {
1959         for (GLuint texnum : frame->temp_textures) {
1960                 resource_pool->release_2d_texture(texnum);
1961         }
1962         frame->temp_textures.clear();
1963         frame->ready_fence.reset();
1964         frame->input_frames.clear();
1965 }
1966
1967 void Mixer::start()
1968 {
1969         mixer_thread = thread(&Mixer::thread_func, this);
1970         audio_thread = thread(&Mixer::audio_thread_func, this);
1971 }
1972
1973 void Mixer::quit()
1974 {
1975         should_quit = true;
1976         audio_task_queue_changed.notify_one();
1977         mixer_thread.join();
1978         audio_thread.join();
1979 #ifdef HAVE_SRT
1980         if (global_flags.srt_port >= 0) {
1981                 // There's seemingly no other reasonable way to wake up the thread
1982                 // (libsrt's epoll equivalent is busy-waiting).
1983                 int sock = srt_socket(AF_INET6, 0, 0);
1984                 if (sock != -1) {
1985                         sockaddr_in6 addr;
1986                         memset(&addr, 0, sizeof(addr));
1987                         addr.sin6_family = AF_INET6;
1988                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1989                         addr.sin6_port = htons(global_flags.srt_port);
1990                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1991                         srt_close(sock);
1992                 }
1993                 srt_thread.join();
1994         }
1995 #endif
1996 }
1997
1998 void Mixer::transition_clicked(int transition_num)
1999 {
2000         theme->transition_clicked(transition_num, pts());
2001 }
2002
2003 void Mixer::channel_clicked(int preview_num)
2004 {
2005         theme->channel_clicked(preview_num);
2006 }
2007
2008 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
2009 {
2010         lock_guard<mutex> lock(card_mutex);
2011         return ycbcr_interpretation[card_index];
2012 }
2013
2014 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
2015 {
2016         lock_guard<mutex> lock(card_mutex);
2017         ycbcr_interpretation[card_index] = interpretation;
2018 }
2019
2020 void Mixer::start_mode_scanning(unsigned card_index)
2021 {
2022         assert(card_index < MAX_VIDEO_CARDS);
2023         if (cards[card_index].capture != nullptr) {
2024                 // Inactive card. Should never happen.
2025                 return;
2026         }
2027         if (is_mode_scanning[card_index]) {
2028                 return;
2029         }
2030         is_mode_scanning[card_index] = true;
2031         mode_scanlist[card_index].clear();
2032         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
2033                 mode_scanlist[card_index].push_back(mode.first);
2034         }
2035         assert(!mode_scanlist[card_index].empty());
2036         mode_scanlist_index[card_index] = 0;
2037         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
2038         last_mode_scan_change[card_index] = steady_clock::now();
2039 }
2040
2041 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
2042 {
2043         assert(desired_output_card_index != -1);
2044         lock_guard<mutex> lock(card_mutex);
2045         return cards[desired_output_card_index].output->get_available_video_modes();
2046 }
2047
2048 string Mixer::get_ffmpeg_filename(unsigned card_index) const
2049 {
2050         assert(card_index < MAX_VIDEO_CARDS);
2051         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2052         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
2053 }
2054
2055 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
2056         assert(card_index < MAX_VIDEO_CARDS);
2057         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2058         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2059 }
2060
2061 void Mixer::wait_for_next_frame()
2062 {
2063         unique_lock<mutex> lock(frame_num_mutex);
2064         unsigned old_frame_num = frame_num;
2065         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
2066                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2067 }
2068
2069 Mixer::OutputChannel::~OutputChannel()
2070 {
2071         if (has_current_frame) {
2072                 parent->release_display_frame(&current_frame);
2073         }
2074         if (has_ready_frame) {
2075                 parent->release_display_frame(&ready_frame);
2076         }
2077 }
2078
2079 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2080 {
2081         // Store this frame for display. Remove the ready frame if any
2082         // (it was seemingly never used).
2083         {
2084                 lock_guard<mutex> lock(frame_mutex);
2085                 if (has_ready_frame) {
2086                         parent->release_display_frame(&ready_frame);
2087                 }
2088                 ready_frame = move(frame);
2089                 has_ready_frame = true;
2090
2091                 // Call the callbacks under the mutex (they should be short),
2092                 // so that we don't race against a callback removal.
2093                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2094                         key_and_callback.second();
2095                 }
2096         }
2097
2098         // Reduce the number of callbacks by filtering duplicates. The reason
2099         // why we bother doing this is that Qt seemingly can get into a state
2100         // where its builds up an essentially unbounded queue of signals,
2101         // consuming more and more memory, and there's no good way of collapsing
2102         // user-defined signals or limiting the length of the queue.
2103         if (transition_names_updated_callback) {
2104                 vector<string> transition_names = global_mixer->get_transition_names();
2105                 bool changed = false;
2106                 if (transition_names.size() != last_transition_names.size()) {
2107                         changed = true;
2108                 } else {
2109                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2110                                 if (transition_names[i] != last_transition_names[i]) {
2111                                         changed = true;
2112                                         break;
2113                                 }
2114                         }
2115                 }
2116                 if (changed) {
2117                         transition_names_updated_callback(transition_names);
2118                         last_transition_names = transition_names;
2119                 }
2120         }
2121         if (name_updated_callback) {
2122                 string name = global_mixer->get_channel_name(channel);
2123                 if (name != last_name) {
2124                         name_updated_callback(name);
2125                         last_name = name;
2126                 }
2127         }
2128         if (color_updated_callback) {
2129                 string color = global_mixer->get_channel_color(channel);
2130                 if (color != last_color) {
2131                         color_updated_callback(color);
2132                         last_color = color;
2133                 }
2134         }
2135 }
2136
2137 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2138 {
2139         lock_guard<mutex> lock(frame_mutex);
2140         if (!has_current_frame && !has_ready_frame) {
2141                 return false;
2142         }
2143
2144         if (has_current_frame && has_ready_frame) {
2145                 // We have a new ready frame. Toss the current one.
2146                 parent->release_display_frame(&current_frame);
2147                 has_current_frame = false;
2148         }
2149         if (has_ready_frame) {
2150                 assert(!has_current_frame);
2151                 current_frame = move(ready_frame);
2152                 ready_frame.ready_fence.reset();  // Drop the refcount.
2153                 ready_frame.input_frames.clear();  // Drop the refcounts.
2154                 has_current_frame = true;
2155                 has_ready_frame = false;
2156         }
2157
2158         *frame = current_frame;
2159         return true;
2160 }
2161
2162 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2163 {
2164         lock_guard<mutex> lock(frame_mutex);
2165         new_frame_ready_callbacks[key] = callback;
2166 }
2167
2168 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2169 {
2170         lock_guard<mutex> lock(frame_mutex);
2171         new_frame_ready_callbacks.erase(key);
2172 }
2173
2174 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2175 {
2176         transition_names_updated_callback = callback;
2177 }
2178
2179 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2180 {
2181         name_updated_callback = callback;
2182 }
2183
2184 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2185 {
2186         color_updated_callback = callback;
2187 }
2188
2189 #ifdef HAVE_SRT
2190 void Mixer::start_srt()
2191 {
2192         SRTSOCKET sock = srt_socket(AF_INET6, 0, 0);
2193         sockaddr_in6 addr;
2194         memset(&addr, 0, sizeof(addr));
2195         addr.sin6_family = AF_INET6;
2196         addr.sin6_port = htons(global_flags.srt_port);
2197
2198         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2199         if (err != 0) {
2200                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2201                 abort();
2202         }
2203         err = srt_listen(sock, MAX_VIDEO_CARDS);
2204         if (err != 0) {
2205                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2206                 abort();
2207         }
2208
2209         srt_thread = thread([this, sock] {
2210                 sockaddr_in6 addr;
2211                 for ( ;; ) {
2212                         int sa_len = sizeof(addr);
2213                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2214                         if (should_quit) {
2215                                 if (clientsock != -1) {
2216                                         srt_close(clientsock);
2217                                 }
2218                                 break;
2219                         }
2220                         if (!global_flags.enable_srt) {  // Runtime UI toggle.
2221                                 // Perhaps not as good as never listening in the first place,
2222                                 // but much simpler to turn on and off.
2223                                 srt_close(clientsock);
2224                                 continue;
2225                         }
2226                         lock_guard<mutex> lock(hotplug_mutex);
2227                         hotplugged_srt_cards.push_back(clientsock);
2228                 }
2229                 srt_close(sock);
2230         });
2231 }
2232 #endif
2233
2234 #ifdef HAVE_SRT
2235 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2236 {
2237         SRT_TRACEBSTATS stats;
2238         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2239
2240         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2241         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2242         card->metric_srt_sent_bytes = stats.byteSentTotal;
2243         card->metric_srt_received_bytes = stats.byteRecvTotal;
2244         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2245         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2246         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2247         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2248         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2249         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2250         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2251         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2252         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2253         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2254         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2255         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2256         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2257         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2258         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2259         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2260         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2261         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2262         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2263         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2264
2265         // Gauges.
2266         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2267         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2268         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2269         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2270         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2271         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2272         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2273         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2274         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2275         card->metric_srt_mss_bytes = stats.byteMSS;
2276         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2277         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2278         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2279         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2280         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2281         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2282         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2283         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2284 }
2285 #endif
2286
2287 string Mixer::description_for_card(unsigned card_index)
2288 {
2289         CaptureCard *card = &cards[card_index];
2290         if (card->capture == nullptr) {
2291                 // Should never be called for inactive cards, but OK.
2292                 char buf[256];
2293                 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2294                 return buf;
2295         }
2296         if (card->type != CardType::FFMPEG_INPUT) {
2297                 char buf[256];
2298                 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2299                 return buf;
2300         }
2301
2302         // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2303         // since it's not too obvious for the user that they are “cards”.
2304         unsigned ffmpeg_index = 0;
2305         for (unsigned i = 0; i < card_index; ++i) {
2306                 CaptureCard *other_card = &cards[i];
2307                 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2308                         ++ffmpeg_index;
2309                 }
2310         }
2311         char buf[256];
2312         snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2313         return buf;
2314 }
2315
2316 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2317 {
2318 #ifdef HAVE_SRT
2319         if (card->type == CardType::FFMPEG_INPUT) {
2320                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2321                 return srt_sock != -1;
2322         }
2323 #endif
2324         return false;
2325 }
2326
2327 mutex RefCountedGLsync::fence_lock;