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