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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect.h>
   8 #include <movit/effect_chain.h>
   9 #include <movit/effect_util.h>
  10 #include <movit/flat_input.h>
  11 #include <movit/image_format.h>
  12 #include <movit/init.h>
  13 #include <movit/resource_pool.h>
  14 #include <pthread.h>
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <algorithm>
  19 #include <chrono>
  20 #include <condition_variable>
  21 #include <cstddef>
  22 #include <cstdint>
  23 #include <memory>
  24 #include <mutex>
  25 #include <ratio>
  26 #include <string>
  27 #include <thread>
  28 #include <utility>
  29 #include <vector>
  30
  31 #include "DeckLinkAPI.h"
  32 #include "LinuxCOM.h"
  33 #include "alsa_output.h"
  34 #include "basic_stats.h"
  35 #include "bmusb/bmusb.h"
  36 #include "bmusb/fake_capture.h"
  37 #ifdef HAVE_CEF
  38 #include "cef_capture.h"
  39 #endif
  40 #include "chroma_subsampler.h"
  41 #include "shared/context.h"
  42 #include "decklink_capture.h"
  43 #include "decklink_output.h"
  44 #include "defs.h"
  45 #include "shared/disk_space_estimator.h"
  46 #include "ffmpeg_capture.h"
  47 #include "flags.h"
  48 #include "image_input.h"
  49 #include "input_mapping.h"
  50 #include "shared/metrics.h"
  51 #include "shared/va_display.h"
  52 #include "mjpeg_encoder.h"
  53 #include "pbo_frame_allocator.h"
  54 #include "shared/ref_counted_gl_sync.h"
  55 #include "resampling_queue.h"
  56 #include "shared/timebase.h"
  57 #include "timecode_renderer.h"
  58 #include "v210_converter.h"
  59 #include "video_encoder.h"
  60
  61 #undef Status
  62 #include <google/protobuf/util/json_util.h>
  63 #include "json.pb.h"
  64
  65 #ifdef HAVE_SRT
  66 // Must come after CEF, since it includes <syslog.h>, which has #defines
  67 // that conflict with CEF logging constants.
  68 #include <srt/srt.h>
  69 #endif
  70
  71 class IDeckLink;
  72 class QOpenGLContext;
  73
  74 using namespace movit;
  75 using namespace std;
  76 using namespace std::chrono;
  77 using namespace std::placeholders;
  78 using namespace bmusb;
  79
  80 Mixer *global_mixer = nullptr;
  81
  82 namespace {
  83
  84 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  85 {
  86         if (interlaced) {
  87                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  88                         input_state->buffered_frames[card_index][frame_num] =
  89                                 input_state->buffered_frames[card_index][frame_num - 1];
  90                 }
  91                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  92         } else {
  93                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  94                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  95                 }
  96         }
  97 }
  98
  99 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
 100 {
 101         bool first;
 102         switch (userdata->pixel_format) {
 103         case PixelFormat_10BitYCbCr:
 104                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
 105                 break;
 106         case PixelFormat_8BitYCbCr:
 107                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
 108                 break;
 109         case PixelFormat_8BitBGRA:
 110                 first = userdata->tex_rgba[field] == 0;
 111                 break;
 112         case PixelFormat_8BitYCbCrPlanar:
 113                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 114                 break;
 115         default:
 116                 assert(false);
 117         }
 118
 119         const bool recreate_main_texture =
 120                 first ||
 121                 width != userdata->last_width[field] ||
 122                 height != userdata->last_height[field] ||
 123                 cbcr_width != userdata->last_cbcr_width[field] ||
 124                 cbcr_height != userdata->last_cbcr_height[field];
 125         const bool recreate_v210_texture =
 126                 global_flags.ten_bit_input &&
 127                 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
 128
 129         if (recreate_main_texture) {
 130                 // We changed resolution since last use of this texture, so we need to create
 131                 // a new object. Note that this each card has its own PBOFrameAllocator,
 132                 // we don't need to worry about these flip-flopping between resolutions.
 133                 switch (userdata->pixel_format) {
 134                 case PixelFormat_10BitYCbCr:
 135                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 136                         check_error();
 137                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 138                         check_error();
 139                         break;
 140                 case PixelFormat_8BitYCbCr: {
 141                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 142                         check_error();
 143                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 144                         check_error();
 145                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 146                         check_error();
 147                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 148                         check_error();
 149                         break;
 150                 }
 151                 case PixelFormat_8BitYCbCrPlanar: {
 152                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 153                         check_error();
 154                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 155                         check_error();
 156                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 157                         check_error();
 158                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 159                         check_error();
 160                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 161                         check_error();
 162                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 163                         check_error();
 164                         break;
 165                 }
 166                 case PixelFormat_8BitBGRA:
 167                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 168                         check_error();
 169                         // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
 170                         glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 171                         check_error();
 172                         break;
 173                 default:
 174                         assert(false);
 175                 }
 176                 userdata->last_width[field] = width;
 177                 userdata->last_height[field] = height;
 178                 userdata->last_cbcr_width[field] = cbcr_width;
 179                 userdata->last_cbcr_height[field] = cbcr_height;
 180         }
 181         if (recreate_v210_texture) {
 182                 // Same as above; we need to recreate the texture.
 183                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 184                 check_error();
 185                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 186                 check_error();
 187                 userdata->last_v210_width[field] = v210_width;
 188                 userdata->last_height[field] = height;
 189         }
 190 }
 191
 192 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 193 {
 194         if (interlaced_stride) {
 195                 stride *= 2;
 196         }
 197         if (global_flags.flush_pbos) {
 198                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 199                 check_error();
 200         }
 201
 202         glBindTexture(GL_TEXTURE_2D, tex);
 203         check_error();
 204         if (interlaced_stride) {
 205                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 206                 check_error();
 207         } else {
 208                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 209                 check_error();
 210         }
 211
 212         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 213         check_error();
 214         glBindTexture(GL_TEXTURE_2D, 0);
 215         check_error();
 216         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 217         check_error();
 218 }
 219
 220 }  // namespace
 221
 222 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 223 {
 224         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 225         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 226 }
 227
 228 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 229 {
 230         global_metrics.remove("input_underestimated_jitter_frames", labels);
 231         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 232 }
 233
 234 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 235 {
 236         if (expected_timestamp > steady_clock::time_point::min()) {
 237                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 238                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 239                 history.push_back(orders.insert(jitter_seconds));
 240                 if (jitter_seconds > estimate_max_jitter()) {
 241                         ++metric_input_underestimated_jitter_frames;
 242                 }
 243
 244                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 245
 246                 if (history.size() > history_length) {
 247                         orders.erase(history.front());
 248                         history.pop_front();
 249                 }
 250                 assert(history.size() <= history_length);
 251         }
 252         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 253 }
 254
 255 double JitterHistory::estimate_max_jitter() const
 256 {
 257         if (orders.empty()) {
 258                 return 0.0;
 259         }
 260         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 261         if (percentile <= 0.5) {
 262                 return *next(orders.begin(), elem_idx) * multiplier;
 263         } else {
 264                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 265         }
 266 }
 267
 268 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 269 {
 270         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 271 }
 272
 273 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 274 {
 275         global_metrics.remove("input_queue_safe_length_frames", labels);
 276 }
 277
 278 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 279                                       steady_clock::time_point expected_next_frame,
 280                                       int64_t input_frame_duration,
 281                                       int64_t master_frame_duration,
 282                                       double max_input_card_jitter_seconds,
 283                                       double max_master_card_jitter_seconds)
 284 {
 285         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 286         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 287
 288         // Figure out when we can expect the next frame for this card, assuming
 289         // worst-case jitter (ie., the frame is maximally late).
 290         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 291
 292         // How many times are the master card expected to tick in that time?
 293         // We assume the master clock has worst-case jitter but not any rate
 294         // discrepancy, ie., it ticks as early as possible every time, but not
 295         // cumulatively.
 296         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 297
 298         // As a special case, if the master card ticks faster than the input card,
 299         // we expect the queue to drain by itself even without dropping. But if
 300         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 301         // go slowly enough that the effect wouldn't really be appreciable.
 302         // We account for this by looking at the situation five frames ahead,
 303         // assuming everything else is the same.
 304         double frames_allowed;
 305         if (master_frame_duration < input_frame_duration) {
 306                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 307         } else {
 308                 frames_allowed = frames_needed;
 309         }
 310
 311         safe_queue_length = max<int>(floor(frames_allowed), 0);
 312         metric_input_queue_safe_length_frames = safe_queue_length;
 313 }
 314
 315 Mixer::Mixer(const QSurfaceFormat &format)
 316         : httpd(),
 317           mixer_surface(create_surface(format)),
 318           h264_encoder_surface(create_surface(format)),
 319           decklink_output_surface(create_surface(format)),
 320           image_update_surface(create_surface(format))
 321 {
 322         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 323         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 324         check_error();
 325
 326         if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
 327             !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
 328                 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
 329                 exit(1);
 330         }
 331
 332         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 333         // will be halved when sampling them, and we need to compensate here.
 334         movit_texel_subpixel_precision /= 2.0;
 335
 336         resource_pool.reset(new ResourcePool);
 337         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 338                 output_channel[i].parent = this;
 339                 output_channel[i].channel = i;
 340         }
 341
 342         ImageFormat inout_format;
 343         inout_format.color_space = COLORSPACE_sRGB;
 344         inout_format.gamma_curve = GAMMA_sRGB;
 345
 346         // Matches the 4:2:0 format created by the main chain.
 347         YCbCrFormat ycbcr_format;
 348         ycbcr_format.chroma_subsampling_x = 2;
 349         ycbcr_format.chroma_subsampling_y = 2;
 350         if (global_flags.ycbcr_rec709_coefficients) {
 351                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 352         } else {
 353                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 354         }
 355         ycbcr_format.full_range = false;
 356         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 357         ycbcr_format.cb_x_position = 0.0f;
 358         ycbcr_format.cr_x_position = 0.0f;
 359         ycbcr_format.cb_y_position = 0.5f;
 360         ycbcr_format.cr_y_position = 0.5f;
 361
 362         // Initialize the neutral colors to sane values.
 363         for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
 364                 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
 365         }
 366
 367         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 368         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 369         check_error();
 370         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 371         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 372         display_chain->add_input(display_input);
 373         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 374         display_chain->set_dither_bits(0);  // Don't bother.
 375         display_chain->finalize();
 376
 377         video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, global_flags.width, global_flags.height, &httpd, global_disk_space_estimator));
 378         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 379                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 380         }
 381
 382         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 383         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
 384
 385         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 386         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 387         audio_mixer.reset(new AudioMixer);
 388
 389         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 390         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
 391                 char url[256];
 392                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
 393                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
 394         }
 395
 396         // Start listening for clients only once VideoEncoder has written its header, if any.
 397         httpd.start(global_flags.http_port);
 398
 399         // First try initializing the then PCI devices, then USB, then
 400         // fill up with fake cards until we have the desired number of cards.
 401         unsigned num_pci_devices = 0;
 402         unsigned card_index = 0;
 403
 404         {
 405                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 406                 if (decklink_iterator != nullptr) {
 407                         for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
 408                                 IDeckLink *decklink;
 409                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 410                                         break;
 411                                 }
 412
 413                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 414                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 415                                 if (!output->set_device(decklink)) {
 416                                         delete output;
 417                                         output = nullptr;
 418                                 }
 419                                 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
 420                                 ++num_pci_devices;
 421                         }
 422                         decklink_iterator->Release();
 423                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 424                 } else {
 425                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 426                 }
 427         }
 428
 429         unsigned num_usb_devices = BMUSBCapture::num_cards();
 430         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < unsigned(global_flags.max_num_cards); ++usb_card_index, ++card_index) {
 431                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 432                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 433                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
 434         }
 435         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 436
 437         // Fill up with fake cards for as long as we can, so that the FFmpeg
 438         // and HTML cards always come last.
 439         unsigned num_fake_cards = 0;
 440 #ifdef HAVE_CEF
 441         size_t num_html_inputs = theme->get_html_inputs().size();
 442 #else
 443         size_t num_html_inputs = 0;
 444 #endif
 445         for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
 446                 // Only bother to activate fake capture cards to satisfy the minimum.
 447                 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
 448                 if (is_active) {
 449                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 450                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 451                         ++num_fake_cards;
 452                 } else {
 453                         configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
 454                 }
 455         }
 456
 457         if (num_fake_cards > 0) {
 458                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 459         }
 460
 461         // Initialize all video inputs the theme asked for.
 462         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 463                 if (card_index >= MAX_VIDEO_CARDS) {
 464                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 465                         abort();
 466                 }
 467                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 468                 video_inputs[video_card_index]->set_card_index(card_index);
 469         }
 470         num_video_inputs = video_inputs.size();
 471
 472 #ifdef HAVE_CEF
 473         // Same, for HTML inputs.
 474         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 475         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 476                 if (card_index >= MAX_VIDEO_CARDS) {
 477                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 478                         abort();
 479                 }
 480                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
 481                 html_inputs[html_card_index]->set_card_index(card_index);
 482         }
 483         num_html_inputs = html_inputs.size();
 484 #endif
 485
 486         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 487         BMUSBCapture::start_bm_thread();
 488
 489 #ifdef HAVE_SRT
 490         if (global_flags.srt_port >= 0) {
 491                 start_srt();
 492         }
 493 #endif
 494
 495         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 496                 cards[card_index].queue_length_policy.reset(card_index);
 497         }
 498
 499         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 500
 501         if (global_flags.ten_bit_input) {
 502                 if (!v210Converter::has_hardware_support()) {
 503                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 504                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 505                         abort();
 506                 }
 507                 v210_converter.reset(new v210Converter());
 508
 509                 // These are all the widths listed in the Blackmagic SDK documentation
 510                 // (section 2.7.3, “Display Modes”).
 511                 v210_converter->precompile_shader(720);
 512                 v210_converter->precompile_shader(1280);
 513                 v210_converter->precompile_shader(1920);
 514                 v210_converter->precompile_shader(2048);
 515                 v210_converter->precompile_shader(3840);
 516                 v210_converter->precompile_shader(4096);
 517         }
 518         if (global_flags.ten_bit_output) {
 519                 if (!v210Converter::has_hardware_support()) {
 520                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 521                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 522                         abort();
 523                 }
 524         }
 525
 526         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 527         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 528         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 529
 530         if (global_flags.enable_alsa_output) {
 531                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 532         }
 533         if (global_flags.output_card != -1) {
 534                 desired_output_card_index = global_flags.output_card;
 535                 set_output_card_internal(global_flags.output_card);
 536         }
 537
 538         output_jitter_history.register_metrics({{ "card", "output" }});
 539
 540         ImageInput::start_update_thread(image_update_surface);
 541 }
 542
 543 Mixer::~Mixer()
 544 {
 545         ImageInput::end_update_thread();
 546
 547         if (mjpeg_encoder != nullptr) {
 548                 mjpeg_encoder->stop();
 549         }
 550         httpd.stop();
 551         BMUSBCapture::stop_bm_thread();
 552
 553         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
 554                 if (cards[card_index].capture != nullptr) {  // Active.
 555                         cards[card_index].capture->stop_dequeue_thread();
 556                 }
 557                 if (cards[card_index].output) {
 558                         cards[card_index].output->end_output();
 559                         cards[card_index].output.reset();
 560                 }
 561         }
 562
 563         video_encoder.reset(nullptr);
 564 }
 565
 566 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
 567 {
 568         bool is_active = capture != nullptr;
 569         if (is_active) {
 570                 printf("Configuring card %d...\n", card_index);
 571         } else {
 572                 assert(card_type == CardType::FAKE_CAPTURE);
 573         }
 574
 575         CaptureCard *card = &cards[card_index];
 576         if (card->capture != nullptr) {
 577                 card_mutex.unlock();  // The dequeue thread could be waiting for bm_frame().
 578                 card->capture->stop_dequeue_thread();
 579                 card_mutex.lock();
 580         }
 581         card->capture.reset(capture);
 582         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 583         if (card->is_fake_capture) {
 584                 card->fake_capture_counter = fake_capture_counter++;
 585         }
 586         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 587         card->may_have_dropped_last_frame = false;
 588         card->type = card_type;
 589         if (card->output.get() != output) {
 590                 card->output.reset(output);
 591         }
 592
 593         PixelFormat pixel_format;
 594         if (card_type == CardType::FFMPEG_INPUT) {
 595                 pixel_format = capture->get_current_pixel_format();
 596         } else if (card_type == CardType::CEF_INPUT) {
 597                 pixel_format = PixelFormat_8BitBGRA;
 598         } else if (global_flags.ten_bit_input) {
 599                 pixel_format = PixelFormat_10BitYCbCr;
 600         } else {
 601                 pixel_format = PixelFormat_8BitYCbCr;
 602         }
 603
 604         if (is_active) {
 605                 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 606                 if (card->frame_allocator == nullptr) {
 607                         card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));  // 8 MB.
 608                 } else {
 609                         // The format could have changed, but we cannot reset the allocator
 610                         // and create a new one from scratch, since there may be allocated
 611                         // frames from it that expect to call release_frame() on it.
 612                         // Instead, ask the allocator to create new frames for us and discard
 613                         // any old ones as they come back. This takes the mutex while
 614                         // allocating, but nothing should really be sending frames in there
 615                         // right now anyway (start_bm_capture() has not been called yet).
 616                         card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
 617                 }
 618                 card->capture->set_video_frame_allocator(card->frame_allocator.get());
 619                 if (card->surface == nullptr) {
 620                         card->surface = create_surface_with_same_format(mixer_surface);
 621                 }
 622                 while (!card->new_frames.empty()) card->new_frames.pop_front();
 623                 card->last_timecode = -1;
 624                 card->capture->set_pixel_format(pixel_format);
 625                 card->capture->configure_card();
 626
 627                 // NOTE: start_bm_capture() happens in thread_func().
 628         }
 629
 630         if (is_srt_card) {
 631                 assert(card_type == CardType::FFMPEG_INPUT);
 632         }
 633
 634         DeviceSpec device;
 635         device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 636         audio_mixer->reset_resampler(device);
 637         unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
 638         if (is_active) {
 639                 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
 640         } else {
 641                 // Note: Keeps the previous name, if any.
 642                 char name[32];
 643                 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
 644                 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
 645         }
 646         audio_mixer->trigger_state_changed_callback();
 647
 648         // Unregister old metrics, if any.
 649         if (!card->labels.empty()) {
 650                 const vector<pair<string, string>> &labels = card->labels;
 651                 card->jitter_history.unregister_metrics(labels);
 652                 card->queue_length_policy.unregister_metrics(labels);
 653                 global_metrics.remove_if_exists("input_received_frames", labels);
 654                 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
 655                 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
 656                 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
 657                 global_metrics.remove_if_exists("input_queue_length_frames", labels);
 658                 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
 659
 660                 global_metrics.remove_if_exists("input_has_signal_bool", labels);
 661                 global_metrics.remove_if_exists("input_is_connected_bool", labels);
 662                 global_metrics.remove_if_exists("input_interlaced_bool", labels);
 663                 global_metrics.remove_if_exists("input_width_pixels", labels);
 664                 global_metrics.remove_if_exists("input_height_pixels", labels);
 665                 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
 666                 global_metrics.remove_if_exists("input_frame_rate_den", labels);
 667                 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
 668
 669                 // SRT metrics.
 670
 671                 // Global measurements (counters).
 672                 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
 673                 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
 674                 global_metrics.remove_if_exists("srt_sent_bytes", labels);
 675                 global_metrics.remove_if_exists("srt_received_bytes", labels);
 676
 677                 vector<pair<string, string>> packet_labels = card->labels;
 678                 packet_labels.emplace_back("type", "normal");
 679                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 680                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 681
 682                 packet_labels.back().second = "lost";
 683                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 684                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 685
 686                 packet_labels.back().second = "retransmitted";
 687                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 688                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 689
 690                 packet_labels.back().second = "ack";
 691                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 692                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 693
 694                 packet_labels.back().second = "nak";
 695                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 696                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 697
 698                 packet_labels.back().second = "dropped";
 699                 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
 700                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 701                 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
 702                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 703
 704                 packet_labels.back().second = "undecryptable";
 705                 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
 706                 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
 707
 708                 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
 709                 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
 710                 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
 711                 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
 712
 713                 // Instant measurements (gauges).
 714                 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
 715                 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
 716                 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
 717                 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
 718                 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
 719                 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
 720                 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
 721                 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
 722                 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
 723                 global_metrics.remove_if_exists("srt_mss_bytes", labels);
 724
 725                 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
 726                 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
 727                 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
 728                 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
 729
 730                 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
 731                 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
 732                 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
 733                 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
 734         }
 735
 736         if (is_active) {
 737                 // Register metrics.
 738                 vector<pair<string, string>> labels;
 739                 char card_name[64];
 740                 snprintf(card_name, sizeof(card_name), "%d", card_index);
 741                 labels.emplace_back("card", card_name);
 742
 743                 switch (card_type) {
 744                 case CardType::LIVE_CARD:
 745                         labels.emplace_back("cardtype", "live");
 746                         break;
 747                 case CardType::FAKE_CAPTURE:
 748                         labels.emplace_back("cardtype", "fake");
 749                         break;
 750                 case CardType::FFMPEG_INPUT:
 751                         if (is_srt_card) {
 752                                 labels.emplace_back("cardtype", "srt");
 753                         } else {
 754                                 labels.emplace_back("cardtype", "ffmpeg");
 755                         }
 756                         break;
 757                 case CardType::CEF_INPUT:
 758                         labels.emplace_back("cardtype", "cef");
 759                         break;
 760                 default:
 761                         assert(false);
 762                 }
 763                 card->jitter_history.register_metrics(labels);
 764                 card->queue_length_policy.register_metrics(labels);
 765                 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 766                 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 767                 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 768                 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 769                 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 770                 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 771
 772                 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 773                 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 774                 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 775                 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 776                 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 777                 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 778                 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 779                 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 780
 781                 if (is_srt_card) {
 782                         // Global measurements (counters).
 783                         global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
 784                         global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
 785                         global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
 786                         global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
 787
 788                         vector<pair<string, string>> packet_labels = labels;
 789                         packet_labels.emplace_back("type", "normal");
 790                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
 791                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
 792
 793                         packet_labels.back().second = "lost";
 794                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
 795                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
 796
 797                         packet_labels.back().second = "retransmitted";
 798                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
 799                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
 800
 801                         packet_labels.back().second = "ack";
 802                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
 803                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
 804
 805                         packet_labels.back().second = "nak";
 806                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
 807                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
 808
 809                         packet_labels.back().second = "dropped";
 810                         global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
 811                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
 812                         global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
 813                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
 814
 815                         packet_labels.back().second = "undecryptable";
 816                         global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
 817                         global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
 818
 819                         global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
 820                         global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
 821                         global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
 822                         global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
 823
 824                         // Instant measurements (gauges).
 825                         global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
 826                         global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
 827                         global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
 828                         global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
 829                         global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
 830                         global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
 831                         global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
 832                         global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
 833                         global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
 834                         global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
 835
 836                         global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
 837                         global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
 838                         global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 839                         global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 840
 841                         global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
 842                         global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
 843                         global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
 844                         global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
 845                 }
 846
 847                 card->labels = labels;
 848         } else {
 849                 card->labels.clear();
 850         }
 851 }
 852
 853 void Mixer::set_output_card_internal(int card_index)
 854 {
 855         // We don't really need to take card_mutex, since we're in the mixer
 856         // thread and don't mess with any queues (which is the only thing that happens
 857         // from other threads), but it's probably the safest in the long run.
 858         unique_lock<mutex> lock(card_mutex);
 859         if (output_card_index != -1) {
 860                 // Switch the old card from output to input.
 861                 CaptureCard *old_card = &cards[output_card_index];
 862                 old_card->output->end_output();
 863
 864                 // Stop the fake card that we put into place.
 865                 // This needs to _not_ happen under the mutex, to avoid deadlock
 866                 // (delivering the last frame needs to take the mutex).
 867                 CaptureInterface *fake_capture = old_card->capture.get();
 868                 lock.unlock();
 869                 fake_capture->stop_dequeue_thread();
 870                 lock.lock();
 871                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 872                 old_card->is_fake_capture = false;
 873                 old_card->capture->start_bm_capture();
 874         }
 875         if (card_index != -1) {
 876                 CaptureCard *card = &cards[card_index];
 877                 CaptureInterface *capture = card->capture.get();
 878                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 879                 // several seconds to complete (blocking on DisableVideoInput);
 880                 // see if we can maybe do it asynchronously.
 881                 lock.unlock();
 882                 capture->stop_dequeue_thread();
 883                 lock.lock();
 884                 card->parked_capture = move(card->capture);
 885                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 886                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
 887                 card->queue_length_policy.reset(card_index);
 888                 card->capture->start_bm_capture();
 889                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 890                 card->output->start_output(desired_output_video_mode, pts_int);
 891         }
 892         output_card_index = card_index;
 893         output_jitter_history.clear();
 894 }
 895
 896 namespace {
 897
 898 int unwrap_timecode(uint16_t current_wrapped, int last)
 899 {
 900         uint16_t last_wrapped = last & 0xffff;
 901         if (current_wrapped > last_wrapped) {
 902                 return (last & ~0xffff) | current_wrapped;
 903         } else {
 904                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 905         }
 906 }
 907
 908 }  // namespace
 909
 910 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 911                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 912                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 913 {
 914         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 915         CaptureCard *card = &cards[card_index];
 916
 917         ++card->metric_input_received_frames;
 918         card->metric_input_has_signal_bool = video_format.has_signal;
 919         card->metric_input_is_connected_bool = video_format.is_connected;
 920         card->metric_input_interlaced_bool = video_format.interlaced;
 921         card->metric_input_width_pixels = video_format.width;
 922         card->metric_input_height_pixels = video_format.height;
 923         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 924         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 925         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 926
 927         if (is_mode_scanning[card_index]) {
 928                 if (video_format.has_signal) {
 929                         // Found a stable signal, so stop scanning.
 930                         is_mode_scanning[card_index] = false;
 931                 } else {
 932                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 933                         steady_clock::time_point now = steady_clock::now();
 934                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 935                         if (sec_since_last_switch > switch_time_s) {
 936                                 // It isn't this mode; try the next one.
 937                                 mode_scanlist_index[card_index]++;
 938                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 939                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 940                                 last_mode_scan_change[card_index] = now;
 941                         }
 942                 }
 943         }
 944
 945         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 946         assert(frame_length > 0);
 947
 948         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;
 949         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 950                 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",
 951                         description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
 952                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 953                 if (video_frame.owner) {
 954                         video_frame.owner->release_frame(video_frame);
 955                 }
 956                 if (audio_frame.owner) {
 957                         audio_frame.owner->release_frame(audio_frame);
 958                 }
 959                 return;
 960         }
 961
 962         int dropped_frames = 0;
 963         if (card->last_timecode != -1) {
 964                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 965         }
 966
 967         // Number of samples per frame if we need to insert silence.
 968         // (Could be nonintegral, but resampling will save us then.)
 969         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 970
 971         if (dropped_frames > MAX_FPS * 2) {
 972                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 973                         description_for_card(card_index).c_str(), card->last_timecode, timecode);
 974                 audio_mixer->reset_resampler(device);
 975                 dropped_frames = 0;
 976                 ++card->metric_input_resets;
 977         } else if (dropped_frames > 0) {
 978                 // Insert silence as needed.
 979                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 980                         description_for_card(card_index).c_str(), dropped_frames, timecode);
 981                 card->metric_input_dropped_frames_error += dropped_frames;
 982
 983                 bool success;
 984                 do {
 985                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 986                 } while (!success);
 987         }
 988
 989         if (num_samples > 0) {
 990                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
 991
 992                 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
 993                 // just gets dropped for now.
 994                 //
 995                 // Only bother doing MJPEG encoding if there are any connected clients
 996                 // that want the stream.
 997                 if (httpd.get_num_connected_multicam_clients() > 0 ||
 998                     httpd.get_num_connected_siphon_clients(card_index) > 0) {
 999                         vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
1000                         lock_guard<mutex> lock(card_mutex);
1001                         if (card->new_raw_audio.empty()) {
1002                                 card->new_raw_audio = move(converted_samples);
1003                         } else {
1004                                 // For raw audio, we don't really synchronize audio and video;
1005                                 // we just put the audio in frame by frame, and if a video frame is
1006                                 // dropped, we still keep the audio, which means it will be added
1007                                 // to the beginning of the next frame. It would probably be better
1008                                 // to move the audio pts earlier to show this, but most players can
1009                                 // live with some jitter, and in a lot of ways, it's much nicer for
1010                                 // Futatabi to have all audio locked to a video frame.
1011                                 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1012
1013                                 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1014                                 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1015                                         size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1016                                         card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1017                                 }
1018                         }
1019                 }
1020         }
1021
1022         // Done with the audio, so release it.
1023         if (audio_frame.owner) {
1024                 audio_frame.owner->release_frame(audio_frame);
1025         }
1026
1027         card->last_timecode = timecode;
1028
1029         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1030         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1031                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1032                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1033                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1034         }
1035 #ifdef HAVE_SRT
1036         if (card->type == CardType::FFMPEG_INPUT) {
1037                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1038                 if (srt_sock != -1) {
1039                         update_srt_stats(srt_sock, card);
1040                 }
1041         }
1042 #endif
1043
1044         size_t y_offset, cbcr_offset;
1045         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1046         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1047                 // The calculation above is wrong for planar Y'CbCr, so just override it.
1048                 assert(card->type == CardType::FFMPEG_INPUT);
1049                 assert(video_offset == 0);
1050                 expected_length = video_frame.len;
1051
1052                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1053                 y_offset = 0;
1054                 cbcr_offset = video_format.width * video_format.height;
1055         } else {
1056                 // All the other Y'CbCr formats are 4:2:2.
1057                 y_offset = video_frame.size / 2 + video_offset / 2;
1058                 cbcr_offset = video_offset / 2;
1059         }
1060         if (video_frame.len - video_offset == 0 ||
1061             video_frame.len - video_offset != expected_length) {
1062                 if (video_frame.len != 0) {
1063                         printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1064                                 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1065                 }
1066                 if (video_frame.owner) {
1067                         video_frame.owner->release_frame(video_frame);
1068                 }
1069
1070                 // Still send on the information that we _had_ a frame, even though it's corrupted,
1071                 // so that pts can go up accordingly.
1072                 {
1073                         lock_guard<mutex> lock(card_mutex);
1074                         CaptureCard::NewFrame new_frame;
1075                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1076                         new_frame.length = frame_length;
1077                         new_frame.interlaced = false;
1078                         new_frame.dropped_frames = dropped_frames;
1079                         new_frame.received_timestamp = video_frame.received_timestamp;
1080                         card->new_frames.push_back(move(new_frame));
1081                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1082                 }
1083                 card->new_frames_changed.notify_all();
1084                 return;
1085         }
1086
1087         unsigned num_fields = video_format.interlaced ? 2 : 1;
1088         steady_clock::time_point frame_upload_start;
1089         if (video_format.interlaced) {
1090                 // Send the two fields along as separate frames; the other side will need to add
1091                 // a deinterlacer to actually get this right.
1092                 assert(video_format.height % 2 == 0);
1093                 video_format.height /= 2;
1094                 assert(frame_length % 2 == 0);
1095                 frame_length /= 2;
1096                 num_fields = 2;
1097                 frame_upload_start = steady_clock::now();
1098         }
1099         assert(userdata != nullptr);
1100         userdata->last_interlaced = video_format.interlaced;
1101         userdata->last_has_signal = video_format.has_signal;
1102         userdata->last_is_connected = video_format.is_connected;
1103         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1104         userdata->last_frame_rate_den = video_format.frame_rate_den;
1105         RefCountedFrame frame(video_frame);
1106
1107         // Send the frames on to the main thread, which will upload and process htem.
1108         // It is entirely possible to upload them in the same thread (and it might even be
1109         // faster, depending on the GPU and driver), but it appears to be trickling
1110         // driver bugs very easily.
1111         //
1112         // Note that this means we must hold on to the actual frame data in <userdata>
1113         // until the upload is done, but we hold on to <frame> much longer than that
1114         // (in fact, all the way until we no longer use the texture in rendering).
1115         for (unsigned field = 0; field < num_fields; ++field) {
1116                 if (field == 1) {
1117                         // Don't upload the second field as fast as we can; wait until
1118                         // the field time has approximately passed. (Otherwise, we could
1119                         // get timing jitter against the other sources, and possibly also
1120                         // against the video display, although the latter is not as critical.)
1121                         // This requires our system clock to be reasonably close to the
1122                         // video clock, but that's not an unreasonable assumption.
1123                         steady_clock::time_point second_field_start = frame_upload_start +
1124                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1125                         this_thread::sleep_until(second_field_start);
1126                 }
1127
1128                 {
1129                         lock_guard<mutex> lock(card_mutex);
1130                         CaptureCard::NewFrame new_frame;
1131                         new_frame.frame = frame;
1132                         new_frame.length = frame_length;
1133                         new_frame.field = field;
1134                         new_frame.interlaced = video_format.interlaced;
1135                         new_frame.dropped_frames = dropped_frames;
1136                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
1137                         new_frame.video_format = video_format;
1138                         new_frame.video_offset = video_offset;
1139                         new_frame.y_offset = y_offset;
1140                         new_frame.cbcr_offset = cbcr_offset;
1141                         new_frame.texture_uploaded = false;
1142                         if (card->type == CardType::FFMPEG_INPUT) {
1143                                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1144                                 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1145                         }
1146                         card->new_frames.push_back(move(new_frame));
1147                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1148                         card->may_have_dropped_last_frame = false;
1149                 }
1150                 card->new_frames_changed.notify_all();
1151         }
1152 }
1153
1154 void Mixer::upload_texture_for_frame(
1155         int field, bmusb::VideoFormat video_format,
1156         size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1157 {
1158         size_t cbcr_width, cbcr_height;
1159         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1160                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1161                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1162         } else {
1163                 // All the other Y'CbCr formats are 4:2:2.
1164                 cbcr_width = video_format.width / 2;
1165                 cbcr_height = video_format.height;
1166         }
1167
1168         bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1169         if (video_format.interlaced) {
1170                 cbcr_height /= 2;
1171         }
1172
1173         unsigned field_start_line;
1174         if (field == 1) {
1175                 field_start_line = video_format.second_field_start;
1176         } else {
1177                 field_start_line = video_format.extra_lines_top;
1178         }
1179
1180         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1181         size_t v210_width = video_format.stride / sizeof(uint32_t);
1182         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1183
1184         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1185         check_error();
1186
1187         switch (userdata->pixel_format) {
1188                 case PixelFormat_10BitYCbCr: {
1189                         size_t field_start = video_offset + video_format.stride * field_start_line;
1190                         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);
1191                         v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1192                         break;
1193                 }
1194                 case PixelFormat_8BitYCbCr: {
1195                         size_t field_y_start = y_offset + video_format.width * field_start_line;
1196                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1197
1198                         // Make up our own strides, since we are interleaving.
1199                         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);
1200                         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);
1201                         break;
1202                 }
1203                 case PixelFormat_8BitYCbCrPlanar: {
1204                         assert(field_start_line == 0);  // We don't really support interlaced here.
1205                         size_t field_y_start = y_offset;
1206                         size_t field_cb_start = cbcr_offset;
1207                         size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1208
1209                         // Make up our own strides, since we are interleaving.
1210                         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);
1211                         upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1212                         upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1213                         break;
1214                 }
1215                 case PixelFormat_8BitBGRA: {
1216                         size_t field_start = video_offset + video_format.stride * field_start_line;
1217                         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);
1218                         // These could be asked to deliver mipmaps at any time.
1219                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1220                         check_error();
1221                         glGenerateMipmap(GL_TEXTURE_2D);
1222                         check_error();
1223                         glBindTexture(GL_TEXTURE_2D, 0);
1224                         check_error();
1225                         break;
1226                 }
1227                 default:
1228                         assert(false);
1229         }
1230
1231         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1232         check_error();
1233 }
1234
1235 void Mixer::bm_hotplug_add(libusb_device *dev)
1236 {
1237         lock_guard<mutex> lock(hotplug_mutex);
1238         hotplugged_cards.push_back(dev);
1239 }
1240
1241 void Mixer::bm_hotplug_remove(unsigned card_index)
1242 {
1243         cards[card_index].new_frames_changed.notify_all();
1244 }
1245
1246 void Mixer::thread_func()
1247 {
1248         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1249
1250         eglBindAPI(EGL_OPENGL_API);
1251         QOpenGLContext *context = create_context(mixer_surface);
1252         if (!make_current(context, mixer_surface)) {
1253                 printf("oops\n");
1254                 abort();
1255         }
1256
1257         // Start the actual capture. (We don't want to do it before we're actually ready
1258         // to process output frames.)
1259         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1260                 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1261                         cards[card_index].capture->start_bm_capture();
1262                 }
1263         }
1264
1265         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1266         int stats_dropped_frames = 0;
1267
1268         while (!should_quit) {
1269                 if (desired_output_card_index != output_card_index) {
1270                         set_output_card_internal(desired_output_card_index);
1271                 }
1272                 if (output_card_index != -1 &&
1273                     desired_output_video_mode != output_video_mode) {
1274                         DeckLinkOutput *output = cards[output_card_index].output.get();
1275                         output->end_output();
1276                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1277                         output->start_output(desired_output_video_mode, pts_int);
1278                 }
1279
1280                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1281                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1282
1283                 bool master_card_is_output;
1284                 unsigned master_card_index;
1285                 if (output_card_index != -1) {
1286                         master_card_is_output = true;
1287                         master_card_index = output_card_index;
1288                 } else {
1289                         master_card_is_output = false;
1290                         master_card_index = theme->map_signal_to_card(master_clock_channel);
1291                         assert(master_card_index < MAX_VIDEO_CARDS);
1292                 }
1293
1294                 {
1295                         lock_guard<mutex> lock(card_mutex);
1296                         handle_hotplugged_cards();
1297                 }
1298
1299                 vector<int32_t> raw_audio[MAX_VIDEO_CARDS];  // For MJPEG encoding.
1300                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1301                 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);
1302                 stats_dropped_frames += output_frame_info.dropped_frames;
1303
1304                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1305                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1306                                 continue;
1307                         }
1308                         if (new_frames[card_index].frame->len == 0) {
1309                                 ++new_frames[card_index].dropped_frames;
1310                         }
1311                         if (new_frames[card_index].dropped_frames > 0) {
1312                                 printf("%s dropped %d frames before this\n",
1313                                         description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1314                         }
1315                 }
1316
1317                 // If the first card is reporting a corrupted or otherwise dropped frame,
1318                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1319                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1320                         ++stats_dropped_frames;
1321                         pts_int += new_frames[master_card_index].length;
1322                         continue;
1323                 }
1324
1325                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1326                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1327                                 continue;
1328
1329                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1330                         assert(new_frame->frame != nullptr);
1331                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1332                         check_error();
1333
1334                         // The new texture might need uploading before use.
1335                         if (!new_frame->texture_uploaded) {
1336                                 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1337                                         new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1338                                 new_frame->texture_uploaded = true;
1339                         }
1340
1341                         // Only set the white balance if it actually changed. This means that the user
1342                         // is free to override the white balance in a video with no white balance information
1343                         // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1344                         // but frame-to-frame decisions will be heeded. We do this pretty much as late
1345                         // as possible (ie., after picking out the frame from the buffer), so that we are sure
1346                         // that the change takes effect on exactly the right frame.
1347                         if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1348                             fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1349                             fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1350                                 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1351                                 last_received_neutral_color[card_index] = new_frame->neutral_color;
1352                         }
1353
1354                         if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1355                                 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1356                                 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);
1357                         }
1358
1359                 }
1360
1361                 int64_t frame_duration = output_frame_info.frame_duration;
1362                 render_one_frame(frame_duration);
1363                 {
1364                         lock_guard<mutex> lock(frame_num_mutex);
1365                         ++frame_num;
1366                 }
1367                 frame_num_updated.notify_all();
1368                 pts_int += frame_duration;
1369
1370                 basic_stats.update(frame_num, stats_dropped_frames);
1371                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1372
1373                 if (should_cut.exchange(false)) {  // Test and clear.
1374                         video_encoder->do_cut(frame_num);
1375                 }
1376
1377 #if 0
1378                 // Reset every 100 frames, so that local variations in frame times
1379                 // (especially for the first few frames, when the shaders are
1380                 // compiled etc.) don't make it hard to measure for the entire
1381                 // remaining duration of the program.
1382                 if (frame == 10000) {
1383                         frame = 0;
1384                         start = now;
1385                 }
1386 #endif
1387                 check_error();
1388         }
1389
1390         resource_pool->clean_context();
1391 }
1392
1393 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1394 {
1395         if (output_card_index != -1) {
1396                 // The output card (ie., cards[output_card_index].output) is the master clock,
1397                 // so no input card (ie., cards[card_index].capture) is.
1398                 return false;
1399         }
1400         return (card_index == master_card_index);
1401 }
1402
1403 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1404 {
1405         // Count the number of frames in the queue, including any frames
1406         // we dropped. It's hard to know exactly how we should deal with
1407         // dropped (corrupted) input frames; they don't help our goal of
1408         // avoiding starvation, but they still add to the problem of latency.
1409         // Since dropped frames is going to mean a bump in the signal anyway,
1410         // we err on the side of having more stable latency instead.
1411         unsigned queue_length = 0;
1412         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1413                 queue_length += frame.dropped_frames + 1;
1414         }
1415
1416         // If needed, drop frames until the queue is below the safe limit.
1417         // We prefer to drop from the head, because all else being equal,
1418         // we'd like more recent frames (less latency).
1419         unsigned dropped_frames = 0;
1420         while (queue_length > safe_queue_length) {
1421                 assert(!card->new_frames.empty());
1422                 assert(queue_length > card->new_frames.front().dropped_frames);
1423                 queue_length -= card->new_frames.front().dropped_frames;
1424
1425                 if (queue_length <= safe_queue_length) {
1426                         // No need to drop anything.
1427                         break;
1428                 }
1429
1430                 card->new_frames.pop_front();
1431                 card->new_frames_changed.notify_all();
1432                 --queue_length;
1433                 ++dropped_frames;
1434
1435                 if (queue_length == 0 && card->is_cef_capture) {
1436                         card->may_have_dropped_last_frame = true;
1437                 }
1438         }
1439
1440         card->metric_input_dropped_frames_jitter += dropped_frames;
1441         card->metric_input_queue_length_frames = queue_length;
1442
1443 #if 0
1444         if (dropped_frames > 0) {
1445                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1446                         card_index, dropped_frames);
1447         }
1448 #endif
1449 }
1450
1451 pair<string, string> Mixer::get_channels_json()
1452 {
1453         Channels ret;
1454         for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1455                 Channel *channel = ret.add_channel();
1456                 channel->set_index(channel_idx + 2);
1457                 channel->set_name(theme->get_channel_name(channel_idx + 2));
1458                 channel->set_color(theme->get_channel_color(channel_idx + 2));
1459         }
1460         string contents;
1461         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1462         return make_pair(contents, "text/json");
1463 }
1464
1465 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1466 {
1467         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1468 }
1469
1470 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])
1471 {
1472         OutputFrameInfo output_frame_info;
1473 start:
1474         unique_lock<mutex> lock(card_mutex, defer_lock);
1475         if (master_card_is_output) {
1476                 // Clocked to the output, so wait for it to be ready for the next frame.
1477                 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);
1478                 lock.lock();
1479         } else {
1480                 // Wait for the master card to have a new frame.
1481                 // TODO: Add a timeout.
1482                 output_frame_info.is_preroll = false;
1483                 lock.lock();
1484                 cards[master_card_index].new_frames_changed.wait(lock, [this, master_card_index]{ return !cards[master_card_index].new_frames.empty() || cards[master_card_index].capture->get_disconnected(); });
1485         }
1486
1487         if (master_card_is_output) {
1488                 handle_hotplugged_cards();
1489         } else if (cards[master_card_index].new_frames.empty()) {
1490                 // We were woken up, but not due to a new frame. Deal with it
1491                 // and then restart.
1492                 assert(cards[master_card_index].capture->get_disconnected());
1493                 handle_hotplugged_cards();
1494                 lock.unlock();
1495                 goto start;
1496         }
1497
1498         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1499                 CaptureCard *card = &cards[card_index];
1500                 if (card->new_frames.empty()) {  // Starvation.
1501                         ++card->metric_input_duped_frames;
1502 #ifdef HAVE_CEF
1503                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1504                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1505                                 // stream of frames, so we'll have to ask it to repaint the frame
1506                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1507                                 // trim the queue completely away, and cleared when we actually
1508                                 // get a new frame.)
1509                                 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1510                         }
1511 #endif
1512                 } else {
1513                         new_frames[card_index] = move(card->new_frames.front());
1514                         has_new_frame[card_index] = true;
1515                         card->new_frames.pop_front();
1516                         card->new_frames_changed.notify_all();
1517                 }
1518
1519                 raw_audio[card_index] = move(card->new_raw_audio);
1520         }
1521
1522         if (!master_card_is_output) {
1523                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1524                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1525                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1526         }
1527
1528         if (!output_frame_info.is_preroll) {
1529                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1530         }
1531
1532         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1533                 CaptureCard *card = &cards[card_index];
1534                 if (has_new_frame[card_index] &&
1535                     !input_card_is_master_clock(card_index, master_card_index) &&
1536                     !output_frame_info.is_preroll) {
1537                         card->queue_length_policy.update_policy(
1538                                 output_frame_info.frame_timestamp,
1539                                 card->jitter_history.get_expected_next_frame(),
1540                                 new_frames[master_card_index].length,
1541                                 output_frame_info.frame_duration,
1542                                 card->jitter_history.estimate_max_jitter(),
1543                                 output_jitter_history.estimate_max_jitter());
1544                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1545                                                   card->queue_length_policy.get_safe_queue_length()));
1546                 }
1547         }
1548
1549         // This might get off by a fractional sample when changing master card
1550         // between ones with different frame rates, but that's fine.
1551         int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1552         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1553         fractional_samples = num_samples_times_timebase % TIMEBASE;
1554         assert(output_frame_info.num_samples >= 0);
1555
1556         return output_frame_info;
1557 }
1558
1559 void Mixer::handle_hotplugged_cards()
1560 {
1561         // Check for cards that have been disconnected since last frame.
1562         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1563                 CaptureCard *card = &cards[card_index];
1564                 if (card->capture != nullptr && card->capture->get_disconnected()) {
1565                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1566                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1567                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1568                         card->queue_length_policy.reset(card_index);
1569                         card->capture->start_bm_capture();
1570                 }
1571         }
1572
1573         // Count how many active cards we already have. Used below to check that we
1574         // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1575         // and HTML “cards” don't count towards this limit.
1576         int num_video_cards = 0;
1577         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1578                 CaptureCard *card = &cards[card_index];
1579                 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1580                         ++num_video_cards;
1581                 }
1582         }
1583
1584         // Check for cards that have been connected since last frame.
1585         vector<libusb_device *> hotplugged_cards_copy;
1586 #ifdef HAVE_SRT
1587         vector<int> hotplugged_srt_cards_copy;
1588 #endif
1589         {
1590                 lock_guard<mutex> lock(hotplug_mutex);
1591                 swap(hotplugged_cards, hotplugged_cards_copy);
1592 #ifdef HAVE_SRT
1593                 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1594 #endif
1595         }
1596         for (libusb_device *new_dev : hotplugged_cards_copy) {
1597                 // Look for a fake capture card where we can stick this in.
1598                 int free_card_index = -1;
1599                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1600                         if (cards[card_index].is_fake_capture) {
1601                                 free_card_index = card_index;
1602                                 break;
1603                         }
1604                 }
1605
1606                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1607                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1608                         libusb_unref_device(new_dev);
1609                 } else {
1610                         // BMUSBCapture takes ownership.
1611                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1612                         CaptureCard *card = &cards[free_card_index];
1613                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1614                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1615                         card->queue_length_policy.reset(free_card_index);
1616                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1617                         capture->start_bm_capture();
1618                 }
1619         }
1620
1621 #ifdef HAVE_SRT
1622         // Same, for SRT inputs.
1623         for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1624                 char name[256];
1625                 int namelen = sizeof(name);
1626                 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1627                 string stream_id(name, namelen);
1628
1629                 // Look for a fake capture card where we can stick this in.
1630                 // Prioritize ones that previously held SRT streams with the
1631                 // same stream ID, if any exist -- and it multiple exist,
1632                 // take the one that disconnected the last.
1633                 int first_free_card_index = -1, last_matching_free_card_index = -1;
1634                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1635                         CaptureCard *card = &cards[card_index];
1636                         if (!card->is_fake_capture) {
1637                                 continue;
1638                         }
1639                         if (first_free_card_index == -1) {
1640                                 first_free_card_index = card_index;
1641                         }
1642                         if (card->last_srt_stream_id == stream_id &&
1643                             (last_matching_free_card_index == -1 ||
1644                              card->fake_capture_counter >
1645                                 cards[last_matching_free_card_index].fake_capture_counter)) {
1646                                 last_matching_free_card_index = card_index;
1647                         }
1648                 }
1649
1650                 const int free_card_index = (last_matching_free_card_index != -1)
1651                         ? last_matching_free_card_index : first_free_card_index;
1652                 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1653                         if (stream_id.empty()) {
1654                                 stream_id = "no name";
1655                         }
1656                         fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1657                         srt_close(sock);
1658                 } else {
1659                         // FFmpegCapture takes ownership.
1660                         if (stream_id.empty()) {
1661                                 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1662                         } else {
1663                                 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1664                         }
1665                         CaptureCard *card = &cards[free_card_index];
1666                         FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1667                         capture->set_card_index(free_card_index);
1668                         configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1669                         update_srt_stats(sock, card);  // Initial zero stats.
1670                         card->last_srt_stream_id = stream_id;
1671                         card->queue_length_policy.reset(free_card_index);
1672                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1673                         capture->start_bm_capture();
1674                 }
1675         }
1676 #endif
1677
1678         // Finally, newly forced-to-active fake capture cards.
1679         for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1680                 CaptureCard *card = &cards[card_index];
1681                 if (card->capture == nullptr && card->force_active) {
1682                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1683                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1684                         card->queue_length_policy.reset(card_index);
1685                         card->capture->start_bm_capture();
1686                 }
1687         }
1688 }
1689
1690
1691 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)
1692 {
1693         // Resample the audio as needed, including from previously dropped frames.
1694         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1695                 const bool dropped_frame = (frame_num != dropped_frames);
1696                 {
1697                         // Signal to the audio thread to process this frame.
1698                         // Note that if the frame is a dropped frame, we signal that
1699                         // we don't want to use this frame as base for adjusting
1700                         // the resampler rate. The reason for this is that the timing
1701                         // of these frames is often way too late; they typically don't
1702                         // “arrive” before we synthesize them. Thus, we could end up
1703                         // in a situation where we have inserted e.g. five audio frames
1704                         // into the queue before we then start pulling five of them
1705                         // back out. This makes ResamplingQueue overestimate the delay,
1706                         // causing undue resampler changes. (We _do_ use the last,
1707                         // non-dropped frame; perhaps we should just discard that as well,
1708                         // since dropped frames are expected to be rare, and it might be
1709                         // better to just wait until we have a slightly more normal situation).
1710                         lock_guard<mutex> lock(audio_mutex);
1711                         bool adjust_rate = !dropped_frame && !is_preroll;
1712                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1713                         audio_task_queue_changed.notify_one();
1714                 }
1715                 if (dropped_frame) {
1716                         // For dropped frames, increase the pts. Note that if the format changed
1717                         // in the meantime, we have no way of detecting that; we just have to
1718                         // assume the frame length is always the same.
1719                         pts_int += length_per_frame;
1720                 }
1721         }
1722 }
1723
1724 void Mixer::render_one_frame(int64_t duration)
1725 {
1726         // Determine the time code for this frame before we start rendering.
1727         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1728         if (display_timecode_on_stdout) {
1729                 printf("Timecode: '%s'\n", timecode_text.c_str());
1730         }
1731
1732         // Update Y'CbCr settings for all cards.
1733         {
1734                 lock_guard<mutex> lock(card_mutex);
1735                 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1736                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1737                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1738                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1739                         input_state.full_range[card_index] = interpretation->full_range;
1740                 }
1741         }
1742
1743         // Get the main chain from the theme, and set its state immediately.
1744         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1745         EffectChain *chain = theme_main_chain.chain;
1746         theme_main_chain.setup_chain();
1747         //theme_main_chain.chain->enable_phase_timing(true);
1748
1749         // If HDMI/SDI output is active and the user has requested auto mode,
1750         // its mode overrides the existing Y'CbCr setting for the chain.
1751         YCbCrLumaCoefficients ycbcr_output_coefficients;
1752         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1753                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1754         } else {
1755                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1756         }
1757
1758         // TODO: Reduce the duplication against theme.cpp.
1759         YCbCrFormat output_ycbcr_format;
1760         output_ycbcr_format.chroma_subsampling_x = 1;
1761         output_ycbcr_format.chroma_subsampling_y = 1;
1762         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1763         output_ycbcr_format.full_range = false;
1764         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1765         chain->change_ycbcr_output_format(output_ycbcr_format);
1766
1767         // Render main chain. If we're using zerocopy Quick Sync encoding
1768         // (the default case), we take an extra copy of the created outputs,
1769         // so that we can display it back to the screen later (it's less memory
1770         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1771         // Ideally, we'd like to avoid taking copies and just use the main textures
1772         // for display as well, but they're just views into VA-API memory and must be
1773         // unmapped during encoding, so we can't use them for display, unfortunately.
1774         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1775         GLuint y_copy_tex, cbcr_copy_tex = 0;
1776         GLuint y_display_tex, cbcr_display_tex;
1777         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1778         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1779         const bool is_zerocopy = video_encoder->is_zerocopy();
1780         if (is_zerocopy) {
1781                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1782                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1783                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1784
1785                 y_display_tex = y_copy_tex;
1786                 cbcr_display_tex = cbcr_copy_tex;
1787
1788                 // y_tex and cbcr_tex will be given by VideoEncoder.
1789         } else {
1790                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1791                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1792                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1793
1794                 y_display_tex = y_tex;
1795                 cbcr_display_tex = cbcr_tex;
1796         }
1797
1798         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1799         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1800         assert(got_frame);
1801
1802         GLuint fbo;
1803         if (is_zerocopy) {
1804                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1805         } else {
1806                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1807         }
1808         check_error();
1809         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1810
1811         if (display_timecode_in_stream) {
1812                 // Render the timecode on top.
1813                 timecode_renderer->render_timecode(fbo, timecode_text);
1814         }
1815
1816         resource_pool->release_fbo(fbo);
1817
1818         if (is_zerocopy) {
1819                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1820         } else {
1821                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1822         }
1823         if (output_card_index != -1) {
1824                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1825         }
1826         resource_pool->release_2d_texture(cbcr_full_tex);
1827
1828         // Set the right state for the Y' and CbCr textures we use for display.
1829         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1830         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1831         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1832         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1833         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1834
1835         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1836         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1837         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1838         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1839
1840         RefCountedGLsync fence = video_encoder->end_frame();
1841
1842         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1843         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1844         DisplayFrame live_frame;
1845         live_frame.chain = display_chain.get();
1846         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1847                 display_input->set_texture_num(0, y_display_tex);
1848                 display_input->set_texture_num(1, cbcr_display_tex);
1849         };
1850         live_frame.ready_fence = fence;
1851         live_frame.input_frames = {};
1852         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1853         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1854
1855         // Set up preview and any additional channels.
1856         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1857                 DisplayFrame display_frame;
1858                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1859                 display_frame.chain = move(chain.chain);
1860                 display_frame.setup_chain = move(chain.setup_chain);
1861                 display_frame.ready_fence = fence;
1862                 display_frame.input_frames = move(chain.input_frames);
1863                 display_frame.temp_textures = {};
1864                 output_channel[i].output_frame(move(display_frame));
1865         }
1866 }
1867
1868 void Mixer::audio_thread_func()
1869 {
1870         pthread_setname_np(pthread_self(), "Mixer_Audio");
1871
1872         while (!should_quit) {
1873                 AudioTask task;
1874
1875                 {
1876                         unique_lock<mutex> lock(audio_mutex);
1877                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1878                         if (should_quit) {
1879                                 return;
1880                         }
1881                         task = audio_task_queue.front();
1882                         audio_task_queue.pop();
1883                 }
1884
1885                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1886                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1887                 vector<float> samples_out = audio_mixer->get_output(
1888                         task.frame_timestamp,
1889                         task.num_samples,
1890                         rate_adjustment_policy);
1891
1892                 // Send the samples to the sound card, then add them to the output.
1893                 if (alsa) {
1894                         alsa->write(samples_out);
1895                 }
1896                 if (output_card_index != -1) {
1897                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1898                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1899                 }
1900                 video_encoder->add_audio(task.pts_int, move(samples_out));
1901         }
1902 }
1903
1904 void Mixer::release_display_frame(DisplayFrame *frame)
1905 {
1906         for (GLuint texnum : frame->temp_textures) {
1907                 resource_pool->release_2d_texture(texnum);
1908         }
1909         frame->temp_textures.clear();
1910         frame->ready_fence.reset();
1911         frame->input_frames.clear();
1912 }
1913
1914 void Mixer::start()
1915 {
1916         mixer_thread = thread(&Mixer::thread_func, this);
1917         audio_thread = thread(&Mixer::audio_thread_func, this);
1918 }
1919
1920 void Mixer::quit()
1921 {
1922         should_quit = true;
1923         audio_task_queue_changed.notify_one();
1924         mixer_thread.join();
1925         audio_thread.join();
1926 #ifdef HAVE_SRT
1927         if (global_flags.srt_port >= 0) {
1928                 // There's seemingly no other reasonable way to wake up the thread
1929                 // (libsrt's epoll equivalent is busy-waiting).
1930                 int sock = srt_socket(AF_INET6, 0, 0);
1931                 if (sock != -1) {
1932                         sockaddr_in6 addr;
1933                         memset(&addr, 0, sizeof(addr));
1934                         addr.sin6_family = AF_INET6;
1935                         addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1936                         addr.sin6_port = htons(global_flags.srt_port);
1937                         srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1938                         srt_close(sock);
1939                 }
1940                 srt_thread.join();
1941         }
1942 #endif
1943 }
1944
1945 void Mixer::transition_clicked(int transition_num)
1946 {
1947         theme->transition_clicked(transition_num, pts());
1948 }
1949
1950 void Mixer::channel_clicked(int preview_num)
1951 {
1952         theme->channel_clicked(preview_num);
1953 }
1954
1955 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1956 {
1957         lock_guard<mutex> lock(card_mutex);
1958         return ycbcr_interpretation[card_index];
1959 }
1960
1961 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1962 {
1963         lock_guard<mutex> lock(card_mutex);
1964         ycbcr_interpretation[card_index] = interpretation;
1965 }
1966
1967 void Mixer::start_mode_scanning(unsigned card_index)
1968 {
1969         assert(card_index < MAX_VIDEO_CARDS);
1970         if (cards[card_index].capture != nullptr) {
1971                 // Inactive card. Should never happen.
1972                 return;
1973         }
1974         if (is_mode_scanning[card_index]) {
1975                 return;
1976         }
1977         is_mode_scanning[card_index] = true;
1978         mode_scanlist[card_index].clear();
1979         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1980                 mode_scanlist[card_index].push_back(mode.first);
1981         }
1982         assert(!mode_scanlist[card_index].empty());
1983         mode_scanlist_index[card_index] = 0;
1984         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1985         last_mode_scan_change[card_index] = steady_clock::now();
1986 }
1987
1988 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1989 {
1990         assert(desired_output_card_index != -1);
1991         lock_guard<mutex> lock(card_mutex);
1992         return cards[desired_output_card_index].output->get_available_video_modes();
1993 }
1994
1995 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1996 {
1997         assert(card_index < MAX_VIDEO_CARDS);
1998         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
1999         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
2000 }
2001
2002 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
2003         assert(card_index < MAX_VIDEO_CARDS);
2004         assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2005         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2006 }
2007
2008 void Mixer::wait_for_next_frame()
2009 {
2010         unique_lock<mutex> lock(frame_num_mutex);
2011         unsigned old_frame_num = frame_num;
2012         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
2013                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2014 }
2015
2016 Mixer::OutputChannel::~OutputChannel()
2017 {
2018         if (has_current_frame) {
2019                 parent->release_display_frame(&current_frame);
2020         }
2021         if (has_ready_frame) {
2022                 parent->release_display_frame(&ready_frame);
2023         }
2024 }
2025
2026 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2027 {
2028         // Store this frame for display. Remove the ready frame if any
2029         // (it was seemingly never used).
2030         {
2031                 lock_guard<mutex> lock(frame_mutex);
2032                 if (has_ready_frame) {
2033                         parent->release_display_frame(&ready_frame);
2034                 }
2035                 ready_frame = move(frame);
2036                 has_ready_frame = true;
2037
2038                 // Call the callbacks under the mutex (they should be short),
2039                 // so that we don't race against a callback removal.
2040                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2041                         key_and_callback.second();
2042                 }
2043         }
2044
2045         // Reduce the number of callbacks by filtering duplicates. The reason
2046         // why we bother doing this is that Qt seemingly can get into a state
2047         // where its builds up an essentially unbounded queue of signals,
2048         // consuming more and more memory, and there's no good way of collapsing
2049         // user-defined signals or limiting the length of the queue.
2050         if (transition_names_updated_callback) {
2051                 vector<string> transition_names = global_mixer->get_transition_names();
2052                 bool changed = false;
2053                 if (transition_names.size() != last_transition_names.size()) {
2054                         changed = true;
2055                 } else {
2056                         for (unsigned i = 0; i < transition_names.size(); ++i) {
2057                                 if (transition_names[i] != last_transition_names[i]) {
2058                                         changed = true;
2059                                         break;
2060                                 }
2061                         }
2062                 }
2063                 if (changed) {
2064                         transition_names_updated_callback(transition_names);
2065                         last_transition_names = transition_names;
2066                 }
2067         }
2068         if (name_updated_callback) {
2069                 string name = global_mixer->get_channel_name(channel);
2070                 if (name != last_name) {
2071                         name_updated_callback(name);
2072                         last_name = name;
2073                 }
2074         }
2075         if (color_updated_callback) {
2076                 string color = global_mixer->get_channel_color(channel);
2077                 if (color != last_color) {
2078                         color_updated_callback(color);
2079                         last_color = color;
2080                 }
2081         }
2082 }
2083
2084 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2085 {
2086         lock_guard<mutex> lock(frame_mutex);
2087         if (!has_current_frame && !has_ready_frame) {
2088                 return false;
2089         }
2090
2091         if (has_current_frame && has_ready_frame) {
2092                 // We have a new ready frame. Toss the current one.
2093                 parent->release_display_frame(&current_frame);
2094                 has_current_frame = false;
2095         }
2096         if (has_ready_frame) {
2097                 assert(!has_current_frame);
2098                 current_frame = move(ready_frame);
2099                 ready_frame.ready_fence.reset();  // Drop the refcount.
2100                 ready_frame.input_frames.clear();  // Drop the refcounts.
2101                 has_current_frame = true;
2102                 has_ready_frame = false;
2103         }
2104
2105         *frame = current_frame;
2106         return true;
2107 }
2108
2109 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2110 {
2111         lock_guard<mutex> lock(frame_mutex);
2112         new_frame_ready_callbacks[key] = callback;
2113 }
2114
2115 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2116 {
2117         lock_guard<mutex> lock(frame_mutex);
2118         new_frame_ready_callbacks.erase(key);
2119 }
2120
2121 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2122 {
2123         transition_names_updated_callback = callback;
2124 }
2125
2126 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2127 {
2128         name_updated_callback = callback;
2129 }
2130
2131 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2132 {
2133         color_updated_callback = callback;
2134 }
2135
2136 #ifdef HAVE_SRT
2137 void Mixer::start_srt()
2138 {
2139         SRTSOCKET sock = srt_socket(AF_INET6, 0, 0);
2140         sockaddr_in6 addr;
2141         memset(&addr, 0, sizeof(addr));
2142         addr.sin6_family = AF_INET6;
2143         addr.sin6_port = htons(global_flags.srt_port);
2144
2145         int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2146         if (err != 0) {
2147                 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2148                 abort();
2149         }
2150         err = srt_listen(sock, MAX_VIDEO_CARDS);
2151         if (err != 0) {
2152                 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2153                 abort();
2154         }
2155
2156         srt_thread = thread([this, sock] {
2157                 sockaddr_in6 addr;
2158                 for ( ;; ) {
2159                         int sa_len = sizeof(addr);
2160                         int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2161                         if (should_quit) {
2162                                 if (clientsock != -1) {
2163                                         srt_close(clientsock);
2164                                 }
2165                                 break;
2166                         }
2167                         if (!global_flags.enable_srt) {  // Runtime UI toggle.
2168                                 // Perhaps not as good as never listening in the first place,
2169                                 // but much simpler to turn on and off.
2170                                 srt_close(clientsock);
2171                                 continue;
2172                         }
2173                         lock_guard<mutex> lock(hotplug_mutex);
2174                         hotplugged_srt_cards.push_back(clientsock);
2175                 }
2176                 srt_close(sock);
2177         });
2178 }
2179 #endif
2180
2181 #ifdef HAVE_SRT
2182 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2183 {
2184         SRT_TRACEBSTATS stats;
2185         srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2186
2187         card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2188         card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2189         card->metric_srt_sent_bytes = stats.byteSentTotal;
2190         card->metric_srt_received_bytes = stats.byteRecvTotal;
2191         card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2192         card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2193         card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2194         card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2195         card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2196         card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2197         card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2198         card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2199         card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2200         card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2201         card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2202         card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2203         card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2204         card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2205         card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2206         card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2207         card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2208         card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2209         card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2210         card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2211
2212         // Gauges.
2213         card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2214         card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2215         card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2216         card->metric_srt_flight_size_packets = stats.pktFlightSize;
2217         card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2218         card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2219         card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2220         card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2221         card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2222         card->metric_srt_mss_bytes = stats.byteMSS;
2223         card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2224         card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2225         card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2226         card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2227         card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2228         card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2229         card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2230         card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2231 }
2232 #endif
2233
2234 string Mixer::description_for_card(unsigned card_index)
2235 {
2236         CaptureCard *card = &cards[card_index];
2237         if (card->capture == nullptr) {
2238                 // Should never be called for inactive cards, but OK.
2239                 char buf[256];
2240                 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2241                 return buf;
2242         }
2243         if (card->type != CardType::FFMPEG_INPUT) {
2244                 char buf[256];
2245                 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2246                 return buf;
2247         }
2248
2249         // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2250         // since it's not too obvious for the user that they are “cards”.
2251         unsigned ffmpeg_index = 0;
2252         for (unsigned i = 0; i < card_index; ++i) {
2253                 CaptureCard *other_card = &cards[i];
2254                 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2255                         ++ffmpeg_index;
2256                 }
2257         }
2258         char buf[256];
2259         snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2260         return buf;
2261 }
2262
2263 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2264 {
2265 #ifdef HAVE_SRT
2266         if (card->type == CardType::FFMPEG_INPUT) {
2267                 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2268                 return srt_sock != -1;
2269         }
2270 #endif
2271         return false;
2272 }
2273
2274 mutex RefCountedGLsync::fence_lock;