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, bool verbose)
 236 {
 237         if (frame_duration != last_duration) {
 238                 // If the frame rate changed, the input clock is also going to change,
 239                 // so our historical data doesn't make much sense anymore.
 240                 // Also, format changes typically introduce blips that are not representative
 241                 // of the typical frame stream. (We make the assumption that format changes
 242                 // don't happen all the time in regular use; if they did, we should probably
 243                 // rather keep the history so that we take jitter they may introduce into account.)
 244                 clear();
 245                 last_duration = frame_duration;
 246                 if (verbose) {
 247                         fprintf(stderr, "JITTER %p: clearing due to format change\n", this);
 248                 }
 249         }
 250         if (expected_timestamp > steady_clock::time_point::min()) {
 251                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 252                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 253                 if (verbose) {
 254                         fprintf(stderr, "JITTER %p: expected_ts=%.6f (after adding %.1f ms for %zu dropped frames, duration=%ld), now=%.6f => %.1f ms late\n",
 255                                 this,
 256                                 duration<double>(expected_timestamp.time_since_epoch()).count(),
 257                                 1e3 * dropped_frames * duration<double>(nanoseconds(frame_duration * 1000000000 / TIMEBASE)).count(),
 258                                 dropped_frames,
 259                                 frame_duration,
 260                                 duration<double>(now.time_since_epoch()).count(),
 261                                 1e3 * duration<double>(now - expected_timestamp).count());
 262                 }
 263                 history.push_back(orders.insert(jitter_seconds));
 264                 if (jitter_seconds > estimate_max_jitter()) {
 265                         ++metric_input_underestimated_jitter_frames;
 266                 }
 267
 268                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 269
 270                 if (history.size() > history_length) {
 271                         orders.erase(history.front());
 272                         history.pop_front();
 273                 }
 274                 assert(history.size() <= history_length);
 275         } else if (verbose) {
 276                 fprintf(stderr, "JITTER %p: now=%.6f, expected=%.6f duration=%ld [initial]\n",
 277                         this,
 278                         duration<double>(now.time_since_epoch()).count(),
 279                         duration<double>((now + nanoseconds(frame_duration * 1000000000 / TIMEBASE)).time_since_epoch()).count(),
 280                         frame_duration);
 281         }
 282         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 283 }
 284
 285 double JitterHistory::estimate_max_jitter() const
 286 {
 287         if (orders.empty()) {
 288                 return 0.0;
 289         }
 290         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 291         if (percentile <= 0.5) {
 292                 return *next(orders.begin(), elem_idx) * multiplier;
 293         } else {
 294                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 295         }
 296 }
 297
 298 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 299 {
 300         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 301 }
 302
 303 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 304 {
 305         global_metrics.remove("input_queue_safe_length_frames", labels);
 306 }
 307
 308 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 309                                       steady_clock::time_point expected_next_input_frame,
 310                                       int64_t input_frame_duration,
 311                                       int64_t master_frame_duration,
 312                                       double max_input_card_jitter_seconds,
 313                                       double max_master_card_jitter_seconds, bool verbose)
 314 {
 315         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 316         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 317
 318         // Figure out when we can expect the next frame for this card, assuming
 319         // worst-case jitter (ie., the frame is maximally late).
 320         double seconds_until_next_frame = max(duration<double>(expected_next_input_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 321
 322         // How many times are the master card expected to tick in that time?
 323         // We assume the master clock has worst-case jitter but not any rate
 324         // discrepancy, ie., it ticks as early as possible every time, but not
 325         // cumulatively.
 326         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 327
 328         // As a special case, if the master card ticks faster than the input card,
 329         // we expect the queue to drain by itself even without dropping. But if
 330         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 331         // go slowly enough that the effect wouldn't really be appreciable.
 332         // We account for this by looking at the situation five frames ahead,
 333         // assuming everything else is the same.
 334         double frames_allowed;
 335         if (master_frame_duration < input_frame_duration) {
 336                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 337         } else {
 338                 frames_allowed = frames_needed;
 339         }
 340         if (verbose) {
 341                 fprintf(stderr, "secs_until_next_frame = %.1f ms, input jitter = %.1f ms, master jitter = %.1f ms, frames_allowed = %.3f\n",
 342                         1e3 * duration<double>(expected_next_input_frame - now).count(),
 343                         1e3 * max_input_card_jitter_seconds,
 344                         1e3 * max_master_card_jitter_seconds,
 345                         frames_allowed);
 346         }
 347
 348         safe_queue_length = max<int>(floor(frames_allowed), 0);
 349         metric_input_queue_safe_length_frames = safe_queue_length;
 350 }
 351
 352 Mixer::Mixer(const QSurfaceFormat &format)
 353         : httpd(),
 354           mixer_surface(create_surface(format)),
 355           h264_encoder_surface(create_surface(format)),
 356           decklink_output_surface(create_surface(format)),
 357           image_update_surface(create_surface(format))
 358 {
 359         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 360         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 361         check_error();
 362
 363         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 364             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 365                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 366                 exit(1);
 367         }
 368
 369         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 370         // will be halved when sampling them, and we need to compensate here.
 371         movit_texel_subpixel_precision /= 2.0;
 372
 373         resource_pool.reset(new ResourcePool);
 374         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 375                 output_channel[i].parent = this;
 376                 output_channel[i].channel = i;
 377         }
 378
 379         ImageFormat inout_format;
 380         inout_format.color_space = COLORSPACE_sRGB;
 381         inout_format.gamma_curve = GAMMA_sRGB;
 382
 383         // Matches the 4:2:0 format created by the main chain.
 384         YCbCrFormat ycbcr_format;
 385         ycbcr_format.chroma_subsampling_x = 2;
 386         ycbcr_format.chroma_subsampling_y = 2;
 387         if (global_flags.ycbcr_rec709_coefficients) {
 388                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 389         } else {
 390                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 391         }
 392         ycbcr_format.full_range = false;
 393         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 394         ycbcr_format.cb_x_position = 0.0f;
 395         ycbcr_format.cr_x_position = 0.0f;
 396         ycbcr_format.cb_y_position = 0.5f;
 397         ycbcr_format.cr_y_position = 0.5f;
 398
 399         // Initialize the neutral colors to sane values.
 400         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 401                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 402         }
 403
 404         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 405         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 406         check_error();
 407         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 408         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 409         display_chain->add_input(display_input);
 410         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 411         display_chain->set_dither_bits(0);  // Don't bother.
 412         display_chain->finalize();
 413
 414         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));
 415         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 416                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 417         }
 418
 419         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 420         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
 421
 422         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 423         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 424         audio_mixer.reset(new AudioMixer);
 425
 426         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 427         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 428                 char url[256];
 429                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 430                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 431         }
 432
 433         // Start listening for clients only once VideoEncoder has written its header, if any.
 434         httpd.start(global_flags.http_port);
 435
 436         // First try initializing the then PCI devices, then USB, then
 437         // fill up with fake cards until we have the desired number of cards.
 438         unsigned num_pci_devices = 0;
 439         unsigned card_index = 0;
 440
 441         {
 442                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 443                 if (decklink_iterator != nullptr) {
 444                         for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
 445                                 IDeckLink *decklink;
 446                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 447                                         break;
 448                                 }
 449
 450                                 if (!decklink_card_is_active(decklink, card_index)) {
 451                                         fprintf(stderr, "DeckLink card %u is inactive in current profile, skipping (try changing it in Desktop Video Setup)\n", card_index);
 452                                         decklink->Release();
 453                                         continue;
 454                                 }
 455
 456                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 457                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 458                                 if (!output->set_device(decklink)) {
 459                                         delete output;
 460                                         output = nullptr;
 461                                 }
 462                                 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
 463                                 ++num_pci_devices;
 464                         }
 465                         decklink_iterator->Release();
 466                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 467                 } else {
 468                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 469                 }
 470         }
 471
 472         unsigned num_usb_devices = BMUSBCapture::num_cards();
 473         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) {
 474                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 475                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 476                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
 477         }
 478         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 479
 480         // Fill up with fake cards for as long as we can, so that the FFmpeg
 481         // and HTML cards always come last.
 482         unsigned num_fake_cards = 0;
 483 #ifdef HAVE_CEF
 484         size_t num_html_inputs = theme->get_html_inputs().size();
 485 #else
 486         size_t num_html_inputs = 0;
 487 #endif
 488         for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
 489                 // Only bother to activate fake capture cards to satisfy the minimum.
 490                 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
 491                 if (is_active) {
 492                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 493                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 494                         ++num_fake_cards;
 495                 } else {
 496                         configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 497                 }
 498         }
 499
 500         if (num_fake_cards > 0) {
 501                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 502         }
 503
 504         // Initialize all video inputs the theme asked for.
 505         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 506                 if (card_index >= MAX_VIDEO_CARDS) {
 507                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 508                         abort();
 509                 }
 510                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 511                 video_inputs[video_card_index]->set_card_index(card_index);
 512         }
 513         num_video_inputs = video_inputs.size();
 514
 515 #ifdef HAVE_CEF
 516         // Same, for HTML inputs.
 517         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 518         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 519                 if (card_index >= MAX_VIDEO_CARDS) {
 520                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 521                         abort();
 522                 }
 523                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 524                 html_inputs[html_card_index]->set_card_index(card_index);
 525         }
 526         num_html_inputs = html_inputs.size();
 527 #endif
 528
 529         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 530         BMUSBCapture::start_bm_thread();
 531
 532 #ifdef HAVE_SRT
 533         if (global_flags.srt_port >= 0) {
 534                 start_srt();
 535         }
 536 #endif
 537
 538         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 539
 540         if (global_flags.ten_bit_input) {
 541                 if (!v210Converter::has_hardware_support()) {
 542                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 543                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 544                         abort();
 545                 }
 546                 v210_converter.reset(new v210Converter());
 547
 548                 // These are all the widths listed in the Blackmagic SDK documentation
 549                 // (section 2.7.3, “Display Modes”).
 550                 v210_converter->precompile_shader(720);
 551                 v210_converter->precompile_shader(1280);
 552                 v210_converter->precompile_shader(1920);
 553                 v210_converter->precompile_shader(2048);
 554                 v210_converter->precompile_shader(3840);
 555                 v210_converter->precompile_shader(4096);
 556         }
 557         if (global_flags.ten_bit_output) {
 558                 if (!v210Converter::has_hardware_support()) {
 559                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 560                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 561                         abort();
 562                 }
 563         }
 564
 565         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 566         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 567         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 568
 569         if (global_flags.enable_alsa_output) {
 570                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 571         }
 572         if (global_flags.output_card != -1) {
 573                 desired_output_card_index = global_flags.output_card;
 574                 set_output_card_internal(global_flags.output_card);
 575         }
 576
 577         output_jitter_history.register_metrics({{ "card", "output" }});
 578
 579         ImageInput::start_update_thread(image_update_surface);
 580 }
 581
 582 Mixer::~Mixer()
 583 {
 584         ImageInput::end_update_thread();
 585
 586         if (mjpeg_encoder != nullptr) {
 587                 mjpeg_encoder->stop();
 588         }
 589         httpd.stop();
 590         BMUSBCapture::stop_bm_thread();
 591
 592         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 593                 if (cards[card_index].capture != nullptr) {  // Active.
 594                         cards[card_index].capture->stop_dequeue_thread();
 595                 }
 596                 if (cards[card_index].output) {
 597                         cards[card_index].output->end_output();
 598                         cards[card_index].output.reset();
 599                 }
 600         }
 601
 602         video_encoder.reset(nullptr);
 603 }
 604
 605 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 606 {
 607         bool is_active = capture != nullptr;
 608         if (is_active) {
 609                 printf("Configuring card %d...\n", card_index);
 610         } else {
 611                 assert(card_type == CardType::FAKE_CAPTURE);
 612         }
 613
 614         CaptureCard *card = &cards[card_index];
 615         if (card->capture != nullptr) {
 616                 card_mutex.unlock();  // The dequeue thread could be waiting for bm_frame().
 617                 card->capture->stop_dequeue_thread();
 618                 card_mutex.lock();
 619         }
 620         card->capture.reset(capture);
 621         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 622         if (card->is_fake_capture) {
 623                 card->fake_capture_counter = fake_capture_counter++;
 624         }
 625         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 626         card->may_have_dropped_last_frame = false;
 627         card->type = card_type;
 628         if (card->output.get() != output) {
 629                 card->output.reset(output);
 630         }
 631
 632         PixelFormat pixel_format;
 633         if (card_type == CardType::FFMPEG_INPUT) {
 634                 pixel_format = capture->get_current_pixel_format();
 635         } else if (card_type == CardType::CEF_INPUT) {
 636                 pixel_format = PixelFormat_8BitBGRA;
 637         } else if (global_flags.ten_bit_input) {
 638                 pixel_format = PixelFormat_10BitYCbCr;
 639         } else {
 640                 pixel_format = PixelFormat_8BitYCbCr;
 641         }
 642
 643         if (is_active) {
 644                 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 645                 if (card->frame_allocator == nullptr) {
 646                         card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 647                 } else {
 648                         // The format could have changed, but we cannot reset the allocator
 649                         // and create a new one from scratch, since there may be allocated
 650                         // frames from it that expect to call release_frame() on it.
 651                         // Instead, ask the allocator to create new frames for us and discard
 652                         // any old ones as they come back. This takes the mutex while
 653                         // allocating, but nothing should really be sending frames in there
 654                         // right now anyway (start_bm_capture() has not been called yet).
 655                         card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 656                 }
 657                 card->capture->set_video_frame_allocator(card->frame_allocator.get());
 658                 if (card->surface == nullptr) {
 659                         card->surface = create_surface_with_same_format(mixer_surface);
 660                 }
 661                 while (!card->new_frames.empty()) card->new_frames.pop_front();
 662                 card->last_timecode = -1;
 663                 card->capture->set_pixel_format(pixel_format);
 664                 card->capture->configure_card();
 665
 666                 // NOTE: start_bm_capture() happens in thread_func().
 667         }
 668
 669         if (is_srt_card) {
 670                 assert(card_type == CardType::FFMPEG_INPUT);
 671         }
 672
 673         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 674         unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
 675         if (is_active) {
 676                 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
 677         } else {
 678                 // Note: Keeps the previous name, if any.
 679                 char name[32];
 680                 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
 681                 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
 682         }
 683         audio_mixer->reset_resampler(device);
 684         audio_mixer->trigger_state_changed_callback();
 685
 686         // Unregister old metrics, if any.
 687         if (!card->labels.empty()) {
 688                 const vector<pair<string, string>> &labels = card->labels;
 689                 card->jitter_history.unregister_metrics(labels);
 690                 card->queue_length_policy.unregister_metrics(labels);
 691                 global_metrics.remove_if_exists("input_received_frames", labels);
 692                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 693                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 694                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 695                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 696                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 697
 698                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 699                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 700                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 701                 global_metrics.remove_if_exists("input_width_pixels", labels);
 702                 global_metrics.remove_if_exists("input_height_pixels", labels);
 703                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 704                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 705                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 706
 707                 // SRT metrics.
 708
 709                 // Global measurements (counters).
 710                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 711                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 712                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 713                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 714
 715                 vector<pair<string, string>> packet_labels = card->labels;
 716                 packet_labels.emplace_back("type", "normal");
 717                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 718                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 719
 720                 packet_labels.back().second = "lost";
 721                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 722                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 723
 724                 packet_labels.back().second = "retransmitted";
 725                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 726                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 727
 728                 packet_labels.back().second = "ack";
 729                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 730                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 731
 732                 packet_labels.back().second = "nak";
 733                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 734                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 735
 736                 packet_labels.back().second = "dropped";
 737                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 738                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 739                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 740                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 741
 742                 packet_labels.back().second = "undecryptable";
 743                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 744                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 745
 746                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 747                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 748                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 749                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 750
 751                 // Instant measurements (gauges).
 752                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 753                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 754                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 755                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 756                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 757                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 758                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 759                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 760                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 761                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 762
 763                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 764                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 765                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 766                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 767
 768                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 769                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 770                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 771                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 772         }
 773
 774         if (is_active) {
 775                 // Register metrics.
 776                 vector<pair<string, string>> labels;
 777                 char card_name[64];
 778                 snprintf(card_name, sizeof(card_name), "%d", card_index);
 779                 labels.emplace_back("card", card_name);
 780
 781                 switch (card_type) {
 782                 case CardType::LIVE_CARD:
 783                         labels.emplace_back("cardtype", "live");
 784                         break;
 785                 case CardType::FAKE_CAPTURE:
 786                         labels.emplace_back("cardtype", "fake");
 787                         break;
 788                 case CardType::FFMPEG_INPUT:
 789                         if (is_srt_card) {
 790                                 labels.emplace_back("cardtype", "srt");
 791                         } else {
 792                                 labels.emplace_back("cardtype", "ffmpeg");
 793                         }
 794                         break;
 795                 case CardType::CEF_INPUT:
 796                         labels.emplace_back("cardtype", "cef");
 797                         break;
 798                 default:
 799                         assert(false);
 800                 }
 801                 card->jitter_history.register_metrics(labels);
 802                 card->queue_length_policy.register_metrics(labels);
 803                 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 804                 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 805                 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 806                 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 807                 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 808                 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 809
 810                 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 811                 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 812                 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 813                 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 814                 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 815                 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 816                 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 817                 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 818
 819                 if (is_srt_card) {
 820                         // Global measurements (counters).
 821                         global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 822                         global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 823                         global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 824                         global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 825
 826                         vector<pair<string, string>> packet_labels = labels;
 827                         packet_labels.emplace_back("type", "normal");
 828                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 829                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 830
 831                         packet_labels.back().second = "lost";
 832                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 833                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 834
 835                         packet_labels.back().second = "retransmitted";
 836                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 837                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 838
 839                         packet_labels.back().second = "ack";
 840                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 841                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 842
 843                         packet_labels.back().second = "nak";
 844                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 845                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 846
 847                         packet_labels.back().second = "dropped";
 848                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 849                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 850                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 851                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 852
 853                         packet_labels.back().second = "undecryptable";
 854                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 855                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 856
 857                         global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 858                         global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 859                         global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 860                         global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 861
 862                         // Instant measurements (gauges).
 863                         global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 864                         global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 865                         global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 866                         global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 867                         global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 868                         global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 869                         global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 870                         global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 871                         global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 872                         global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 873
 874                         global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 875                         global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 876                         global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 877                         global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 878
 879                         global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 880                         global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 881                         global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 882                         global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 883                 }
 884
 885                 card->labels = labels;
 886         } else {
 887                 card->labels.clear();
 888         }
 889 }
 890
 891 void Mixer::set_output_card_internal(int card_index)
 892 {
 893         // We don't really need to take card_mutex, since we're in the mixer
 894         // thread and don't mess with any queues (which is the only thing that happens
 895         // from other threads), but it's probably the safest in the long run.
 896         unique_lock<mutex> lock(card_mutex);
 897         if (output_card_index != -1) {
 898                 // Switch the old card from output to input.
 899                 CaptureCard *old_card = &cards[output_card_index];
 900                 old_card->output->end_output();
 901
 902                 // Stop the fake card that we put into place.
 903                 // This needs to _not_ happen under the mutex, to avoid deadlock
 904                 // (delivering the last frame needs to take the mutex).
 905                 CaptureInterface *fake_capture = old_card->capture.get();
 906                 lock.unlock();
 907                 fake_capture->stop_dequeue_thread();
 908                 lock.lock();
 909                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 910                 old_card->is_fake_capture = false;
 911                 old_card->capture->start_bm_capture();
 912         }
 913         if (card_index != -1) {
 914                 CaptureCard *card = &cards[card_index];
 915                 CaptureInterface *capture = card->capture.get();
 916                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 917                 // several seconds to complete (blocking on DisableVideoInput);
 918                 // see if we can maybe do it asynchronously.
 919                 lock.unlock();
 920                 capture->stop_dequeue_thread();
 921                 lock.lock();
 922                 card->parked_capture = move(card->capture);
 923                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 924                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
 925                 card->jitter_history.clear();
 926                 card->capture->start_bm_capture();
 927                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 928                 card->output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/slave_to_output);
 929         }
 930         output_card_index = card_index;
 931         output_jitter_history.clear();
 932 }
 933
 934 namespace {
 935
 936 int unwrap_timecode(uint16_t current_wrapped, int last)
 937 {
 938         uint16_t last_wrapped = last & 0xffff;
 939         if (current_wrapped > last_wrapped) {
 940                 return (last & ~0xffff) | current_wrapped;
 941         } else {
 942                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 943         }
 944 }
 945
 946 }  // namespace
 947
 948 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 949                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 950                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 951 {
 952         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 953         CaptureCard *card = &cards[card_index];
 954
 955         ++card->metric_input_received_frames;
 956         card->metric_input_has_signal_bool = video_format.has_signal;
 957         card->metric_input_is_connected_bool = video_format.is_connected;
 958         card->metric_input_interlaced_bool = video_format.interlaced;
 959         card->metric_input_width_pixels = video_format.width;
 960         card->metric_input_height_pixels = video_format.height;
 961         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 962         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 963         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 964
 965         if (is_mode_scanning[card_index]) {
 966                 if (video_format.has_signal) {
 967                         // Found a stable signal, so stop scanning.
 968                         is_mode_scanning[card_index] = false;
 969                 } else {
 970                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 971                         steady_clock::time_point now = steady_clock::now();
 972                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 973                         if (sec_since_last_switch > switch_time_s) {
 974                                 // It isn't this mode; try the next one.
 975                                 mode_scanlist_index[card_index]++;
 976                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 977                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 978                                 last_mode_scan_change[card_index] = now;
 979                         }
 980                 }
 981         }
 982
 983         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 984         assert(frame_length > 0);
 985
 986         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;
 987         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 988                 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",
 989                         description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
 990                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 991                 if (video_frame.owner) {
 992                         video_frame.owner->release_frame(video_frame);
 993                 }
 994                 if (audio_frame.owner) {
 995                         audio_frame.owner->release_frame(audio_frame);
 996                 }
 997                 return;
 998         }
 999
1000         int dropped_frames = 0;
1001         if (card->last_timecode != -1) {
1002                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
1003         }
1004
1005         // Number of samples per frame if we need to insert silence.
1006         // (Could be nonintegral, but resampling will save us then.)
1007         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
1008
1009         if (dropped_frames > MAX_FPS * 2) {
1010                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
1011                         description_for_card(card_index).c_str(), card->last_timecode, timecode);
1012                 audio_mixer->reset_resampler(device);
1013                 dropped_frames = 0;
1014                 ++card->metric_input_resets;
1015         } else if (dropped_frames > 0) {
1016                 // Insert silence as needed.
1017                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
1018                         description_for_card(card_index).c_str(), dropped_frames, timecode);
1019                 card->metric_input_dropped_frames_error += dropped_frames;
1020
1021                 bool success;
1022                 do {
1023                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
1024                 } while (!success);
1025         }
1026
1027         if (num_samples > 0) {
1028                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
1029
1030                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
1031                 // just gets dropped for now.
1032                 //
1033                 // Only bother doing MJPEG encoding if there are any connected clients
1034                 // that want the stream.
1035                 if (httpd.get_num_connected_multicam_clients() > 0 ||
1036                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
1037                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
1038                         lock_guard<mutex> lock(card_mutex);
1039                         if (card->new_raw_audio.empty()) {
1040                                 card->new_raw_audio = move(converted_samples);
1041                         } else {
1042                                 // For raw audio, we don't really synchronize audio and video;
1043                                 // we just put the audio in frame by frame, and if a video frame is
1044                                 // dropped, we still keep the audio, which means it will be added
1045                                 // to the beginning of the next frame. It would probably be better
1046                                 // to move the audio pts earlier to show this, but most players can
1047                                 // live with some jitter, and in a lot of ways, it's much nicer for
1048                                 // Futatabi to have all audio locked to a video frame.
1049                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1050
1051                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1052                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1053                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1054                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1055                                 }
1056                         }
1057                 }
1058         }
1059
1060         // Done with the audio, so release it.
1061         if (audio_frame.owner) {
1062                 audio_frame.owner->release_frame(audio_frame);
1063         }
1064
1065         card->last_timecode = timecode;
1066
1067         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1068         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1069                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1070                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1071                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1072         }
1073 #ifdef HAVE_SRT
1074         if (card->type == CardType::FFMPEG_INPUT) {
1075                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1076                 if (srt_sock != -1) {
1077                         update_srt_stats(srt_sock, card);
1078                 }
1079         }
1080 #endif
1081
1082         size_t y_offset, cbcr_offset;
1083         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1084         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1085                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1086                 assert(card->type == CardType::FFMPEG_INPUT);
1087                 assert(video_offset == 0);
1088                 expected_length = video_frame.len;
1089
1090                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1091                 y_offset = 0;
1092                 cbcr_offset = video_format.width * video_format.height;
1093         } else {
1094                 // All the other Y'CbCr formats are 4:2:2.
1095                 y_offset = video_frame.size / 2 + video_offset / 2;
1096                 cbcr_offset = video_offset / 2;
1097         }
1098         if (video_frame.len - video_offset == 0 ||
1099             video_frame.len - video_offset != expected_length) {
1100                 if (video_frame.len != 0) {
1101                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1102                                 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1103                 }
1104                 if (video_frame.owner) {
1105                         video_frame.owner->release_frame(video_frame);
1106                 }
1107
1108                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1109                 // so that pts can go up accordingly.
1110                 {
1111                         lock_guard<mutex> lock(card_mutex);
1112                         CaptureCard::NewFrame new_frame;
1113                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1114                         new_frame.length = frame_length;
1115                         new_frame.interlaced = false;
1116                         new_frame.dropped_frames = dropped_frames;
1117                         new_frame.received_timestamp = video_frame.received_timestamp;
1118                         card->new_frames.push_back(move(new_frame));
1119                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1120                 }
1121                 card->new_frames_changed.notify_all();
1122                 return;
1123         }
1124
1125         unsigned num_fields = video_format.interlaced ? 2 : 1;
1126         steady_clock::time_point frame_upload_start;
1127         if (video_format.interlaced) {
1128                 // Send the two fields along as separate frames; the other side will need to add
1129                 // a deinterlacer to actually get this right.
1130                 assert(video_format.height % 2 == 0);
1131                 video_format.height /= 2;
1132                 assert(frame_length % 2 == 0);
1133                 frame_length /= 2;
1134                 num_fields = 2;
1135                 frame_upload_start = steady_clock::now();
1136         }
1137         assert(userdata != nullptr);
1138         userdata->last_interlaced = video_format.interlaced;
1139         userdata->last_has_signal = video_format.has_signal;
1140         userdata->last_is_connected = video_format.is_connected;
1141         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1142         userdata->last_frame_rate_den = video_format.frame_rate_den;
1143         RefCountedFrame frame(video_frame);
1144
1145         // Send the frames on to the main thread, which will upload and process htem.
1146         // It is entirely possible to upload them in the same thread (and it might even be
1147         // faster, depending on the GPU and driver), but it appears to be trickling
1148         // driver bugs very easily.
1149         //
1150         // Note that this means we must hold on to the actual frame data in <userdata>
1151         // until the upload is done, but we hold on to <frame> much longer than that
1152         // (in fact, all the way until we no longer use the texture in rendering).
1153         for (unsigned field = 0; field < num_fields; ++field) {
1154                 if (field == 1) {
1155                         // Don't upload the second field as fast as we can; wait until
1156                         // the field time has approximately passed. (Otherwise, we could
1157                         // get timing jitter against the other sources, and possibly also
1158                         // against the video display, although the latter is not as critical.)
1159                         // This requires our system clock to be reasonably close to the
1160                         // video clock, but that's not an unreasonable assumption.
1161                         steady_clock::time_point second_field_start = frame_upload_start +
1162                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1163                         this_thread::sleep_until(second_field_start);
1164                 }
1165
1166                 {
1167                         lock_guard<mutex> lock(card_mutex);
1168                         CaptureCard::NewFrame new_frame;
1169                         new_frame.frame = frame;
1170                         new_frame.length = frame_length;
1171                         new_frame.field = field;
1172                         new_frame.interlaced = video_format.interlaced;
1173                         new_frame.dropped_frames = dropped_frames;
1174                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1175                         new_frame.video_format = video_format;
1176                         new_frame.video_offset = video_offset;
1177                         new_frame.y_offset = y_offset;
1178                         new_frame.cbcr_offset = cbcr_offset;
1179                         new_frame.texture_uploaded = false;
1180                         if (card->type == CardType::FFMPEG_INPUT) {
1181                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1182                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1183                         }
1184                         card->new_frames.push_back(move(new_frame));
1185                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1186                         card->may_have_dropped_last_frame = false;
1187                 }
1188                 card->new_frames_changed.notify_all();
1189         }
1190 }
1191
1192 void Mixer::upload_texture_for_frame(
1193         int field, bmusb::VideoFormat video_format,
1194         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1195 {
1196         size_t cbcr_width, cbcr_height;
1197         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1198                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1199                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1200         } else {
1201                 // All the other Y'CbCr formats are 4:2:2.
1202                 cbcr_width = video_format.width / 2;
1203                 cbcr_height = video_format.height;
1204         }
1205
1206         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1207         if (video_format.interlaced) {
1208                 cbcr_height /= 2;
1209         }
1210
1211         unsigned field_start_line;
1212         if (field == 1) {
1213                 field_start_line = video_format.second_field_start;
1214         } else {
1215                 field_start_line = video_format.extra_lines_top;
1216         }
1217
1218         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1219         size_t v210_width = video_format.stride / sizeof(uint32_t);
1220         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1221
1222         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1223         check_error();
1224
1225         switch (userdata->pixel_format) {
1226                 case PixelFormat_10BitYCbCr: {
1227                         size_t field_start = video_offset + video_format.stride * field_start_line;
1228                         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);
1229                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1230                         break;
1231                 }
1232                 case PixelFormat_8BitYCbCr: {
1233                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1234                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1235
1236                         // Make up our own strides, since we are interleaving.
1237                         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);
1238                         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);
1239                         break;
1240                 }
1241                 case PixelFormat_8BitYCbCrPlanar: {
1242                         assert(field_start_line == 0);  // We don't really support interlaced here.
1243                         size_t field_y_start = y_offset;
1244                         size_t field_cb_start = cbcr_offset;
1245                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1246
1247                         // Make up our own strides, since we are interleaving.
1248                         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);
1249                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1250                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1251                         break;
1252                 }
1253                 case PixelFormat_8BitBGRA: {
1254                         size_t field_start = video_offset + video_format.stride * field_start_line;
1255                         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);
1256                         // These could be asked to deliver mipmaps at any time.
1257                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1258                         check_error();
1259                         glGenerateMipmap(GL_TEXTURE_2D);
1260                         check_error();
1261                         glBindTexture(GL_TEXTURE_2D, 0);
1262                         check_error();
1263                         break;
1264                 }
1265                 default:
1266                         assert(false);
1267         }
1268
1269         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1270         check_error();
1271 }
1272
1273 void Mixer::bm_hotplug_add(libusb_device *dev)
1274 {
1275         lock_guard<mutex> lock(hotplug_mutex);
1276         hotplugged_cards.push_back(dev);
1277 }
1278
1279 void Mixer::bm_hotplug_remove(unsigned card_index)
1280 {
1281         cards[card_index].new_frames_changed.notify_all();
1282 }
1283
1284 void Mixer::thread_func()
1285 {
1286         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1287
1288         eglBindAPI(EGL_OPENGL_API);
1289         QOpenGLContext *context = create_context(mixer_surface);
1290         if (!make_current(context, mixer_surface)) {
1291                 printf("oops\n");
1292                 abort();
1293         }
1294
1295         // Start the actual capture. (We don't want to do it before we're actually ready
1296         // to process output frames.)
1297         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1298                 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1299                         cards[card_index].capture->start_bm_capture();
1300                 }
1301         }
1302
1303         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1304         int stats_dropped_frames = 0;
1305
1306         while (!should_quit) {
1307                 if (desired_output_card_index != output_card_index) {
1308                         set_output_card_internal(desired_output_card_index);
1309                 }
1310                 if (output_card_index != -1 &&
1311                     desired_output_video_mode != output_video_mode) {
1312                         DeckLinkOutput *output = cards[output_card_index].output.get();
1313                         output->end_output();
1314                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1315                         output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/slave_to_output);
1316                 }
1317
1318                 {
1319                         lock_guard<mutex> lock(card_mutex);
1320                         handle_hotplugged_cards();
1321                 }
1322
1323                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1324                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1325
1326                 bool master_card_is_output;
1327                 unsigned master_card_index;
1328                 if (output_card_index != -1 && slave_to_output) {
1329                         master_card_is_output = true;
1330                         master_card_index = output_card_index;
1331                 } else {
1332                         master_card_is_output = false;
1333                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1334                         assert(master_card_index < MAX_VIDEO_CARDS);
1335                 }
1336
1337                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1338                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1339                 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);
1340                 stats_dropped_frames += output_frame_info.dropped_frames;
1341
1342                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1343                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1344                                 continue;
1345                         }
1346                         if (new_frames[card_index].frame->len == 0) {
1347                                 ++new_frames[card_index].dropped_frames;
1348                         }
1349                         if (new_frames[card_index].dropped_frames > 0) {
1350                                 printf("%s dropped %d frames before this\n",
1351                                         description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1352                         }
1353                 }
1354
1355                 // If the first card is reporting a corrupted or otherwise dropped frame,
1356                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1357                 if (!master_card_is_output &&
1358                     new_frames[master_card_index].frame != nullptr &&  // Timeout.
1359                     new_frames[master_card_index].frame->len == 0) {
1360                         ++stats_dropped_frames;
1361                         pts_int += new_frames[master_card_index].length;
1362                         continue;
1363                 }
1364
1365                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1366                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1367                                 continue;
1368
1369                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1370                         assert(new_frame->frame != nullptr);
1371                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1372                         check_error();
1373
1374                         // The new texture might need uploading before use.
1375                         if (!new_frame->texture_uploaded) {
1376                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1377                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1378                                 new_frame->texture_uploaded = true;
1379                         }
1380
1381                         // Only set the white balance if it actually changed. This means that the user
1382                         // is free to override the white balance in a video with no white balance information
1383                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1384                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1385                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1386                         // that the change takes effect on exactly the right frame.
1387                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1388                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1389                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1390                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1391                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1392                         }
1393
1394                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1395                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1396                                 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);
1397                         }
1398
1399                 }
1400
1401                 int64_t frame_duration = output_frame_info.frame_duration;
1402                 render_one_frame(frame_duration);
1403                 {
1404                         lock_guard<mutex> lock(frame_num_mutex);
1405                         ++frame_num;
1406                 }
1407                 frame_num_updated.notify_all();
1408                 pts_int += frame_duration;
1409
1410                 basic_stats.update(frame_num, stats_dropped_frames);
1411                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1412
1413                 if (should_cut.exchange(false)) {  // Test and clear.
1414                         video_encoder->do_cut(frame_num);
1415                 }
1416
1417 #if 0
1418                 // Reset every 100 frames, so that local variations in frame times
1419                 // (especially for the first few frames, when the shaders are
1420                 // compiled etc.) don't make it hard to measure for the entire
1421                 // remaining duration of the program.
1422                 if (frame == 10000) {
1423                         frame = 0;
1424                         start = now;
1425                 }
1426 #endif
1427                 check_error();
1428         }
1429
1430         resource_pool->clean_context();
1431 }
1432
1433 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1434 {
1435         if (output_card_index != -1 && slave_to_output) {
1436                 // The output card (ie., cards[output_card_index].output) is the master clock,
1437                 // so no input card (ie., cards[card_index].capture) is.
1438                 return false;
1439         }
1440         return (card_index == master_card_index);
1441 }
1442
1443 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1444 {
1445         // Count the number of frames in the queue, including any frames
1446         // we dropped. It's hard to know exactly how we should deal with
1447         // dropped (corrupted) input frames; they don't help our goal of
1448         // avoiding starvation, but they still add to the problem of latency.
1449         // Since dropped frames is going to mean a bump in the signal anyway,
1450         // we err on the side of having more stable latency instead.
1451         unsigned queue_length = 0;
1452         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1453                 queue_length += frame.dropped_frames + 1;
1454         }
1455
1456         // If needed, drop frames until the queue is below the safe limit.
1457         // We prefer to drop from the head, because all else being equal,
1458         // we'd like more recent frames (less latency).
1459         unsigned dropped_frames = 0;
1460         while (queue_length > safe_queue_length) {
1461                 assert(!card->new_frames.empty());
1462                 assert(queue_length > card->new_frames.front().dropped_frames);
1463                 queue_length -= card->new_frames.front().dropped_frames;
1464
1465                 if (queue_length <= safe_queue_length) {
1466                         // No need to drop anything.
1467                         break;
1468                 }
1469
1470                 card->new_frames.pop_front();
1471                 card->new_frames_changed.notify_all();
1472                 --queue_length;
1473                 ++dropped_frames;
1474
1475                 if (queue_length == 0 && card->is_cef_capture) {
1476                         card->may_have_dropped_last_frame = true;
1477                 }
1478         }
1479
1480         card->metric_input_dropped_frames_jitter += dropped_frames;
1481         card->metric_input_queue_length_frames = queue_length;
1482
1483 #if 0
1484         if (dropped_frames > 0) {
1485                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1486                         card_index, dropped_frames);
1487         }
1488 #endif
1489 }
1490
1491 pair<string, string> Mixer::get_channels_json()
1492 {
1493         Channels ret;
1494         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1495                 Channel *channel = ret.add_channel();
1496                 channel->set_index(channel_idx + 2);
1497                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1498                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1499         }
1500         string contents;
1501         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1502         return make_pair(contents, "text/json");
1503 }
1504
1505 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1506 {
1507         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1508 }
1509
1510 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])
1511 {
1512         OutputFrameInfo output_frame_info;
1513         constexpr steady_clock::duration master_card_timeout = milliseconds(200);
1514 start:
1515         unique_lock<mutex> lock(card_mutex, defer_lock);
1516         bool timed_out = false;
1517         if (master_card_is_output) {
1518                 // Clocked to the output, so wait for it to be ready for the next frame.
1519                 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);
1520                 lock.lock();
1521         } else {
1522                 // Wait for the master card to have a new frame.
1523                 output_frame_info.is_preroll = false;
1524                 lock.lock();
1525                 timed_out = !cards[master_card_index].new_frames_changed.wait_for(lock,
1526                         master_card_timeout,
1527                         [this, master_card_index] {
1528                                 return !cards[master_card_index].new_frames.empty() ||
1529                                         cards[master_card_index].capture == nullptr ||
1530                                         cards[master_card_index].capture->get_disconnected();
1531                         });
1532                 if (timed_out) {
1533                         fprintf(stderr, "WARNING: Master card (%s) did not deliver a frame for %u ms, creating a fake one.\n",
1534                                 description_for_card(master_card_index).c_str(),
1535                                 unsigned(duration_cast<milliseconds>(master_card_timeout).count()));
1536                 }
1537         }
1538
1539         if (timed_out) {
1540                 // The master card stalled for 200 ms (possible when it's e.g.
1541                 // an SRT card). Send a frame no matter what; this also makes sure
1542                 // any other cards get to empty their queues, and in general,
1543                 // that we make _some_ sort of forward progress.
1544                 handle_hotplugged_cards();
1545         } else if (master_card_is_output) {
1546                 handle_hotplugged_cards();
1547         } else if (cards[master_card_index].new_frames.empty()) {
1548                 // We were woken up, but not due to a new frame. Deal with it
1549                 // and then restart.
1550                 assert(cards[master_card_index].capture == nullptr ||
1551                        cards[master_card_index].capture->get_disconnected());
1552                 handle_hotplugged_cards();
1553                 lock.unlock();
1554                 goto start;
1555         }
1556
1557         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1558                 CaptureCard *card = &cards[card_index];
1559                 if (card->new_frames.empty()) {  // Starvation.
1560                         ++card->metric_input_duped_frames;
1561 #ifdef HAVE_CEF
1562                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1563                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1564                                 // stream of frames, so we'll have to ask it to repaint the frame
1565                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1566                                 // trim the queue completely away, and cleared when we actually
1567                                 // get a new frame.)
1568                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1569                         }
1570 #endif
1571                 } else {
1572                         new_frames[card_index] = move(card->new_frames.front());
1573                         has_new_frame[card_index] = true;
1574                         card->new_frames.pop_front();
1575                         card->new_frames_changed.notify_all();
1576                 }
1577
1578                 raw_audio[card_index] = move(card->new_raw_audio);
1579         }
1580
1581         if (timed_out) {
1582                 // Pretend the frame happened a while ago and was only processed now,
1583                 // so that we get the duration sort-of right. This isn't ideal.
1584                 output_frame_info.dropped_frames = 0;  // Hard to define, really.
1585                 output_frame_info.frame_duration = lrint(TIMEBASE * duration<double>(master_card_timeout).count());
1586                 output_frame_info.frame_timestamp = steady_clock::now() - master_card_timeout;
1587         } else if (!master_card_is_output) {
1588                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1589                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1590                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1591         }
1592
1593         if (!output_frame_info.is_preroll) {
1594                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1595         }
1596
1597         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1598                 CaptureCard *card = &cards[card_index];
1599                 if (has_new_frame[card_index] &&
1600                     !input_card_is_master_clock(card_index, master_card_index) &&
1601                     !output_frame_info.is_preroll) {
1602                         card->queue_length_policy.update_policy(
1603                                 output_frame_info.frame_timestamp,
1604                                 card->jitter_history.get_expected_next_frame(),
1605                                 new_frames[master_card_index].length,
1606                                 output_frame_info.frame_duration,
1607                                 card->jitter_history.estimate_max_jitter(),
1608                                 output_jitter_history.estimate_max_jitter());
1609                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1610                                                   card->queue_length_policy.get_safe_queue_length()));
1611                 }
1612         }
1613
1614         // This might get off by a fractional sample when changing master card
1615         // between ones with different frame rates, but that's fine.
1616         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1617         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1618         fractional_samples = num_samples_times_timebase % TIMEBASE;
1619         assert(output_frame_info.num_samples >= 0);
1620
1621         if (timed_out) {
1622                 DeviceSpec device{InputSourceType::CAPTURE_CARD, master_card_index};
1623                 bool success;
1624                 do {
1625                         success = audio_mixer->add_silence(device, output_frame_info.num_samples, /*dropped_frames=*/0);
1626                 } while (!success);
1627         }
1628
1629         return output_frame_info;
1630 }
1631
1632 void Mixer::handle_hotplugged_cards()
1633 {
1634         // Check for cards that have been disconnected since last frame.
1635         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1636                 CaptureCard *card = &cards[card_index];
1637                 if (card->capture != nullptr && card->capture->get_disconnected()) {
1638                         bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
1639                         if (is_active) {
1640                                 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1641                                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1642                                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1643                                 card->jitter_history.clear();
1644                                 card->capture->start_bm_capture();
1645                         } else {
1646                                 // NOTE: The theme might end up forcing the card back at some later point
1647                                 // (ie., force_active is false now, but might immediately be true again on
1648                                 // e.g. the next frame). That should be rare, though, so we don't bother
1649                                 // adjusting the message.
1650                                 fprintf(stderr, "Card %u went away, removing. (To keep a fake card, increase --num-cards.)\n", card_index);
1651                                 theme->remove_card(card_index);
1652                                 configure_card(card_index, /*capture=*/nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1653                                 card->jitter_history.clear();
1654                         }
1655                 }
1656         }
1657
1658         // Count how many active cards we already have. Used below to check that we
1659         // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1660         // and HTML “cards” don't count towards this limit.
1661         int num_video_cards = 0;
1662         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1663                 CaptureCard *card = &cards[card_index];
1664                 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1665                         ++num_video_cards;
1666                 }
1667         }
1668
1669         // Check for cards that have been connected since last frame.
1670         vector<libusb_device *> hotplugged_cards_copy;
1671 #ifdef HAVE_SRT
1672         vector<int> hotplugged_srt_cards_copy;
1673 #endif
1674         {
1675                 lock_guard<mutex> lock(hotplug_mutex);
1676                 swap(hotplugged_cards, hotplugged_cards_copy);
1677 #ifdef HAVE_SRT
1678                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1679 #endif
1680         }
1681         for (libusb_device *new_dev : hotplugged_cards_copy) {
1682                 // Look for a fake capture card where we can stick this in.
1683                 int free_card_index = -1;
1684                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1685                         if (cards[card_index].is_fake_capture) {
1686                                 free_card_index = card_index;
1687                                 break;
1688                         }
1689                 }
1690
1691                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1692                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1693                         libusb_unref_device(new_dev);
1694                 } else {
1695                         // BMUSBCapture takes ownership.
1696                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1697                         CaptureCard *card = &cards[free_card_index];
1698                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1699                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1700                         card->jitter_history.clear();
1701                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1702                         capture->start_bm_capture();
1703                 }
1704         }
1705
1706 #ifdef HAVE_SRT
1707         // Same, for SRT inputs.
1708         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1709                 char name[256];
1710                 int namelen = sizeof(name);
1711                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1712                 string stream_id(name, namelen);
1713
1714                 // Look for a fake capture card where we can stick this in.
1715                 // Prioritize ones that previously held SRT streams with the
1716                 // same stream ID, if any exist -- and it multiple exist,
1717                 // take the one that disconnected the last.
1718                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1719                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1720                         CaptureCard *card = &cards[card_index];
1721                         if (!card->is_fake_capture) {
1722                                 continue;
1723                         }
1724                         if (first_free_card_index == -1) {
1725                                 first_free_card_index = card_index;
1726                         }
1727                         if (card->last_srt_stream_id == stream_id &&
1728                             (last_matching_free_card_index == -1 ||
1729                              card->fake_capture_counter >
1730                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1731                                 last_matching_free_card_index = card_index;
1732                         }
1733                 }
1734
1735                 const int free_card_index = (last_matching_free_card_index != -1)
1736                         ? last_matching_free_card_index : first_free_card_index;
1737                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1738                         if (stream_id.empty()) {
1739                                 stream_id = "no name";
1740                         }
1741                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1742                         srt_close(sock);
1743                 } else {
1744                         // FFmpegCapture takes ownership.
1745                         if (stream_id.empty()) {
1746                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1747                         } else {
1748                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1749                         }
1750                         CaptureCard *card = &cards[free_card_index];
1751                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1752                         capture->set_card_index(free_card_index);
1753                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1754                         update_srt_stats(sock, card);  // Initial zero stats.
1755                         card->last_srt_stream_id = stream_id;
1756                         card->jitter_history.clear();
1757                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1758                         capture->start_bm_capture();
1759                 }
1760         }
1761 #endif
1762
1763         // Finally, newly forced-to-active fake capture cards.
1764         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1765                 CaptureCard *card = &cards[card_index];
1766                 if (card->capture == nullptr && card->force_active) {
1767                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1768                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1769                         card->jitter_history.clear();
1770                         card->capture->start_bm_capture();
1771                 }
1772         }
1773 }
1774
1775
1776 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)
1777 {
1778         // Resample the audio as needed, including from previously dropped frames.
1779         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1780                 const bool dropped_frame = (frame_num != dropped_frames);
1781                 {
1782                         // Signal to the audio thread to process this frame.
1783                         // Note that if the frame is a dropped frame, we signal that
1784                         // we don't want to use this frame as base for adjusting
1785                         // the resampler rate. The reason for this is that the timing
1786                         // of these frames is often way too late; they typically don't
1787                         // “arrive” before we synthesize them. Thus, we could end up
1788                         // in a situation where we have inserted e.g. five audio frames
1789                         // into the queue before we then start pulling five of them
1790                         // back out. This makes ResamplingQueue overestimate the delay,
1791                         // causing undue resampler changes. (We _do_ use the last,
1792                         // non-dropped frame; perhaps we should just discard that as well,
1793                         // since dropped frames are expected to be rare, and it might be
1794                         // better to just wait until we have a slightly more normal situation).
1795                         lock_guard<mutex> lock(audio_mutex);
1796                         bool adjust_rate = !dropped_frame && !is_preroll;
1797                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1798                         audio_task_queue_changed.notify_one();
1799                 }
1800                 if (dropped_frame) {
1801                         // For dropped frames, increase the pts. Note that if the format changed
1802                         // in the meantime, we have no way of detecting that; we just have to
1803                         // assume the frame length is always the same.
1804                         pts_int += length_per_frame;
1805                 }
1806         }
1807 }
1808
1809 void Mixer::render_one_frame(int64_t duration)
1810 {
1811         // Determine the time code for this frame before we start rendering.
1812         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1813         if (display_timecode_on_stdout) {
1814                 printf("Timecode: '%s'\n", timecode_text.c_str());
1815         }
1816
1817         // Update Y'CbCr settings for all cards.
1818         {
1819                 lock_guard<mutex> lock(card_mutex);
1820                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1821                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1822                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1823                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1824                         input_state.full_range[card_index] = interpretation->full_range;
1825                 }
1826         }
1827
1828         // Get the main chain from the theme, and set its state immediately.
1829         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1830         EffectChain *chain = theme_main_chain.chain;
1831         theme_main_chain.setup_chain();
1832         //theme_main_chain.chain->enable_phase_timing(true);
1833
1834         // If HDMI/SDI output is active and the user has requested auto mode,
1835         // its mode overrides the existing Y'CbCr setting for the chain.
1836         YCbCrLumaCoefficients ycbcr_output_coefficients;
1837         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1838                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1839         } else {
1840                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1841         }
1842
1843         // TODO: Reduce the duplication against theme.cpp.
1844         YCbCrFormat output_ycbcr_format;
1845         output_ycbcr_format.chroma_subsampling_x = 1;
1846         output_ycbcr_format.chroma_subsampling_y = 1;
1847         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1848         output_ycbcr_format.full_range = false;
1849         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1850         chain->change_ycbcr_output_format(output_ycbcr_format);
1851
1852         // Render main chain. If we're using zerocopy Quick Sync encoding
1853         // (the default case), we take an extra copy of the created outputs,
1854         // so that we can display it back to the screen later (it's less memory
1855         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1856         // Ideally, we'd like to avoid taking copies and just use the main textures
1857         // for display as well, but they're just views into VA-API memory and must be
1858         // unmapped during encoding, so we can't use them for display, unfortunately.
1859         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1860         GLuint y_copy_tex, cbcr_copy_tex = 0;
1861         GLuint y_display_tex, cbcr_display_tex;
1862         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1863         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1864         const bool is_zerocopy = video_encoder->is_zerocopy();
1865         if (is_zerocopy) {
1866                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1867                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1868                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1869
1870                 y_display_tex = y_copy_tex;
1871                 cbcr_display_tex = cbcr_copy_tex;
1872
1873                 // y_tex and cbcr_tex will be given by VideoEncoder.
1874         } else {
1875                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1876                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1877                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1878
1879                 y_display_tex = y_tex;
1880                 cbcr_display_tex = cbcr_tex;
1881         }
1882
1883         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1884         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1885         assert(got_frame);
1886
1887         GLuint fbo;
1888         if (is_zerocopy) {
1889                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1890         } else {
1891                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1892         }
1893         check_error();
1894         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1895
1896         if (display_timecode_in_stream) {
1897                 // Render the timecode on top.
1898                 timecode_renderer->render_timecode(fbo, timecode_text);
1899         }
1900
1901         resource_pool->release_fbo(fbo);
1902
1903         if (is_zerocopy) {
1904                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1905         } else {
1906                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1907         }
1908         if (output_card_index != -1) {
1909                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1910         }
1911         resource_pool->release_2d_texture(cbcr_full_tex);
1912
1913         // Set the right state for the Y' and CbCr textures we use for display.
1914         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1915         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1916         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1917         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1918         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1919
1920         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1921         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1922         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1923         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1924
1925         RefCountedGLsync fence = video_encoder->end_frame();
1926
1927         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1928         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1929         DisplayFrame live_frame;
1930         live_frame.chain = display_chain.get();
1931         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1932                 display_input->set_texture_num(0, y_display_tex);
1933                 display_input->set_texture_num(1, cbcr_display_tex);
1934         };
1935         live_frame.ready_fence = fence;
1936         live_frame.input_frames = {};
1937         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1938         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1939
1940         // Set up preview and any additional channels.
1941         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1942                 DisplayFrame display_frame;
1943                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1944                 display_frame.chain = move(chain.chain);
1945                 display_frame.setup_chain = move(chain.setup_chain);
1946                 display_frame.ready_fence = fence;
1947                 display_frame.input_frames = move(chain.input_frames);
1948                 display_frame.temp_textures = {};
1949                 output_channel[i].output_frame(move(display_frame));
1950         }
1951 }
1952
1953 void Mixer::audio_thread_func()
1954 {
1955         pthread_setname_np(pthread_self(), "Mixer_Audio");
1956
1957         while (!should_quit) {
1958                 AudioTask task;
1959
1960                 {
1961                         unique_lock<mutex> lock(audio_mutex);
1962                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1963                         if (should_quit) {
1964                                 return;
1965                         }
1966                         task = audio_task_queue.front();
1967                         audio_task_queue.pop();
1968                 }
1969
1970                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1971                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1972                 vector<float> samples_out = audio_mixer->get_output(
1973                         task.frame_timestamp,
1974                         task.num_samples,
1975                         rate_adjustment_policy);
1976
1977                 // Send the samples to the sound card, then add them to the output.
1978                 if (alsa) {
1979                         alsa->write(samples_out);
1980                 }
1981                 if (output_card_index != -1) {
1982                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1983                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1984                 }
1985                 video_encoder->add_audio(task.pts_int, move(samples_out));
1986         }
1987 }
1988
1989 void Mixer::release_display_frame(DisplayFrame *frame)
1990 {
1991         for (GLuint texnum : frame->temp_textures) {
1992                 resource_pool->release_2d_texture(texnum);
1993         }
1994         frame->temp_textures.clear();
1995         frame->ready_fence.reset();
1996         frame->input_frames.clear();
1997 }
1998
1999 void Mixer::start()
2000 {
2001         mixer_thread = thread(&Mixer::thread_func, this);
2002         audio_thread = thread(&Mixer::audio_thread_func, this);
2003 }
2004
2005 void Mixer::quit()
2006 {
2007         should_quit = true;
2008         audio_task_queue_changed.notify_one();
2009         mixer_thread.join();
2010         audio_thread.join();
2011 #ifdef HAVE_SRT
2012         if (global_flags.srt_port >= 0) {
2013                 // There's seemingly no other reasonable way to wake up the thread
2014                 // (libsrt's epoll equivalent is busy-waiting).
2015                 int sock = srt_create_socket();
2016                 if (sock != -1) {
2017                         sockaddr_in6 addr;
2018                         memset(&addr, 0, sizeof(addr));
2019                         addr.sin6_family = AF_INET6;
2020                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
2021                         addr.sin6_port = htons(global_flags.srt_port);
2022                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
2023                         srt_close(sock);
2024                 }
2025                 srt_thread.join();
2026         }
2027 #endif
2028 }
2029
2030 void Mixer::transition_clicked(int transition_num)
2031 {
2032         theme->transition_clicked(transition_num, pts());
2033 }
2034
2035 void Mixer::channel_clicked(int preview_num)
2036 {
2037         theme->channel_clicked(preview_num);
2038 }
2039
2040 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
2041 {
2042         lock_guard<mutex> lock(card_mutex);
2043         return ycbcr_interpretation[card_index];
2044 }
2045
2046 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
2047 {
2048         lock_guard<mutex> lock(card_mutex);
2049         ycbcr_interpretation[card_index] = interpretation;
2050 }
2051
2052 void Mixer::start_mode_scanning(unsigned card_index)
2053 {
2054         assert(card_index < MAX_VIDEO_CARDS);
2055         if (cards[card_index].capture != nullptr) {
2056                 // Inactive card. Should never happen.
2057                 return;
2058         }
2059         if (is_mode_scanning[card_index]) {
2060                 return;
2061         }
2062         is_mode_scanning[card_index] = true;
2063         mode_scanlist[card_index].clear();
2064         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
2065                 mode_scanlist[card_index].push_back(mode.first);
2066         }
2067         assert(!mode_scanlist[card_index].empty());
2068         mode_scanlist_index[card_index] = 0;
2069         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
2070         last_mode_scan_change[card_index] = steady_clock::now();
2071 }
2072
2073 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
2074 {
2075         assert(desired_output_card_index != -1);
2076         lock_guard<mutex> lock(card_mutex);
2077         return cards[desired_output_card_index].output->get_available_video_modes();
2078 }
2079
2080 string Mixer::get_ffmpeg_filename(unsigned card_index) const
2081 {
2082         assert(card_index < MAX_VIDEO_CARDS);
2083         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2084         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
2085 }
2086
2087 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
2088         assert(card_index < MAX_VIDEO_CARDS);
2089         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2090         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2091 }
2092
2093 void Mixer::wait_for_next_frame()
2094 {
2095         unique_lock<mutex> lock(frame_num_mutex);
2096         unsigned old_frame_num = frame_num;
2097         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
2098                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2099 }
2100
2101 Mixer::OutputChannel::~OutputChannel()
2102 {
2103         if (has_current_frame) {
2104                 parent->release_display_frame(&current_frame);
2105         }
2106         if (has_ready_frame) {
2107                 parent->release_display_frame(&ready_frame);
2108         }
2109 }
2110
2111 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2112 {
2113         // Store this frame for display. Remove the ready frame if any
2114         // (it was seemingly never used).
2115         {
2116                 lock_guard<mutex> lock(frame_mutex);
2117                 if (has_ready_frame) {
2118                         parent->release_display_frame(&ready_frame);
2119                 }
2120                 ready_frame = move(frame);
2121                 has_ready_frame = true;
2122
2123                 // Call the callbacks under the mutex (they should be short),
2124                 // so that we don't race against a callback removal.
2125                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2126                         key_and_callback.second();
2127                 }
2128         }
2129
2130         // Reduce the number of callbacks by filtering duplicates. The reason
2131         // why we bother doing this is that Qt seemingly can get into a state
2132         // where its builds up an essentially unbounded queue of signals,
2133         // consuming more and more memory, and there's no good way of collapsing
2134         // user-defined signals or limiting the length of the queue.
2135         if (transition_names_updated_callback) {
2136                 vector<string> transition_names = global_mixer->get_transition_names();
2137                 bool changed = false;
2138                 if (transition_names.size() != last_transition_names.size()) {
2139                         changed = true;
2140                 } else {
2141                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2142                                 if (transition_names[i] != last_transition_names[i]) {
2143                                         changed = true;
2144                                         break;
2145                                 }
2146                         }
2147                 }
2148                 if (changed) {
2149                         transition_names_updated_callback(transition_names);
2150                         last_transition_names = transition_names;
2151                 }
2152         }
2153         if (name_updated_callback) {
2154                 string name = global_mixer->get_channel_name(channel);
2155                 if (name != last_name) {
2156                         name_updated_callback(name);
2157                         last_name = name;
2158                 }
2159         }
2160         if (color_updated_callback) {
2161                 string color = global_mixer->get_channel_color(channel);
2162                 if (color != last_color) {
2163                         color_updated_callback(color);
2164                         last_color = color;
2165                 }
2166         }
2167 }
2168
2169 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2170 {
2171         lock_guard<mutex> lock(frame_mutex);
2172         if (!has_current_frame && !has_ready_frame) {
2173                 return false;
2174         }
2175
2176         if (has_current_frame && has_ready_frame) {
2177                 // We have a new ready frame. Toss the current one.
2178                 parent->release_display_frame(&current_frame);
2179                 has_current_frame = false;
2180         }
2181         if (has_ready_frame) {
2182                 assert(!has_current_frame);
2183                 current_frame = move(ready_frame);
2184                 ready_frame.ready_fence.reset();  // Drop the refcount.
2185                 ready_frame.input_frames.clear();  // Drop the refcounts.
2186                 has_current_frame = true;
2187                 has_ready_frame = false;
2188         }
2189
2190         *frame = current_frame;
2191         return true;
2192 }
2193
2194 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2195 {
2196         lock_guard<mutex> lock(frame_mutex);
2197         new_frame_ready_callbacks[key] = callback;
2198 }
2199
2200 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2201 {
2202         lock_guard<mutex> lock(frame_mutex);
2203         new_frame_ready_callbacks.erase(key);
2204 }
2205
2206 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2207 {
2208         transition_names_updated_callback = callback;
2209 }
2210
2211 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2212 {
2213         name_updated_callback = callback;
2214 }
2215
2216 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2217 {
2218         color_updated_callback = callback;
2219 }
2220
2221 #ifdef HAVE_SRT
2222 void Mixer::start_srt()
2223 {
2224         SRTSOCKET sock = srt_create_socket();
2225         sockaddr_in6 addr;
2226         memset(&addr, 0, sizeof(addr));
2227         addr.sin6_family = AF_INET6;
2228         addr.sin6_port = htons(global_flags.srt_port);
2229
2230         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2231         if (err != 0) {
2232                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2233                 abort();
2234         }
2235         err = srt_listen(sock, MAX_VIDEO_CARDS);
2236         if (err != 0) {
2237                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2238                 abort();
2239         }
2240
2241         srt_thread = thread([this, sock] {
2242                 sockaddr_in6 addr;
2243                 for ( ;; ) {
2244                         int sa_len = sizeof(addr);
2245                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2246                         if (should_quit) {
2247                                 if (clientsock != -1) {
2248                                         srt_close(clientsock);
2249                                 }
2250                                 break;
2251                         }
2252                         if (!global_flags.enable_srt) {  // Runtime UI toggle.
2253                                 // Perhaps not as good as never listening in the first place,
2254                                 // but much simpler to turn on and off.
2255                                 srt_close(clientsock);
2256                                 continue;
2257                         }
2258                         lock_guard<mutex> lock(hotplug_mutex);
2259                         hotplugged_srt_cards.push_back(clientsock);
2260                 }
2261                 srt_close(sock);
2262         });
2263 }
2264 #endif
2265
2266 #ifdef HAVE_SRT
2267 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2268 {
2269         SRT_TRACEBSTATS stats;
2270         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2271
2272         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2273         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2274         card->metric_srt_sent_bytes = stats.byteSentTotal;
2275         card->metric_srt_received_bytes = stats.byteRecvTotal;
2276         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2277         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2278         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2279         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2280         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2281         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2282         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2283         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2284         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2285         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2286         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2287         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2288         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2289         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2290         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2291         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2292         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2293         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2294         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2295         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2296
2297         // Gauges.
2298         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2299         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2300         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2301         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2302         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2303         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2304         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2305         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2306         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2307         card->metric_srt_mss_bytes = stats.byteMSS;
2308         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2309         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2310         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2311         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2312         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2313         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2314         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2315         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2316 }
2317 #endif
2318
2319 string Mixer::description_for_card(unsigned card_index)
2320 {
2321         CaptureCard *card = &cards[card_index];
2322         if (card->capture == nullptr) {
2323                 // Should never be called for inactive cards, but OK.
2324                 char buf[256];
2325                 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2326                 return buf;
2327         }
2328         if (card->type != CardType::FFMPEG_INPUT) {
2329                 char buf[256];
2330                 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2331                 return buf;
2332         }
2333
2334         // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2335         // since it's not too obvious for the user that they are “cards”.
2336         unsigned ffmpeg_index = 0;
2337         for (unsigned i = 0; i < card_index; ++i) {
2338                 CaptureCard *other_card = &cards[i];
2339                 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2340                         ++ffmpeg_index;
2341                 }
2342         }
2343         char buf[256];
2344         snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2345         return buf;
2346 }
2347
2348 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2349 {
2350 #ifdef HAVE_SRT
2351         if (card->type == CardType::FFMPEG_INPUT) {
2352                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2353                 return srt_sock != -1;
2354         }
2355 #endif
2356         return false;
2357 }
2358
2359 mutex RefCountedGLsync::fence_lock;