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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect_chain.h>
   8 #include <movit/effect_util.h>
   9 #include <movit/flat_input.h>
  10 #include <movit/image_format.h>
  11 #include <movit/init.h>
  12 #include <movit/resource_pool.h>
  13 #include <pthread.h>
  14 #include <stdint.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <algorithm>
  18 #include <chrono>
  19 #include <condition_variable>
  20 #include <cstddef>
  21 #include <cstdint>
  22 #include <memory>
  23 #include <mutex>
  24 #include <ratio>
  25 #include <string>
  26 #include <thread>
  27 #include <utility>
  28 #include <vector>
  29
  30 #include "DeckLinkAPI.h"
  31 #include "LinuxCOM.h"
  32 #include "alsa_output.h"
  33 #include "basic_stats.h"
  34 #include "bmusb/bmusb.h"
  35 #include "bmusb/fake_capture.h"
  36 #ifdef HAVE_CEF
  37 #include "cef_capture.h"
  38 #endif
  39 #include "chroma_subsampler.h"
  40 #include "context.h"
  41 #include "decklink_capture.h"
  42 #include "decklink_output.h"
  43 #include "defs.h"
  44 #include "disk_space_estimator.h"
  45 #include "ffmpeg_capture.h"
  46 #include "flags.h"
  47 #include "input_mapping.h"
  48 #include "metrics.h"
  49 #include "pbo_frame_allocator.h"
  50 #include "ref_counted_gl_sync.h"
  51 #include "resampling_queue.h"
  52 #include "timebase.h"
  53 #include "timecode_renderer.h"
  54 #include "v210_converter.h"
  55 #include "video_encoder.h"
  56
  57 #undef Status
  58 #include <google/protobuf/util/json_util.h>
  59 #include "json.pb.h"
  60
  61 class IDeckLink;
  62 class QOpenGLContext;
  63
  64 using namespace movit;
  65 using namespace std;
  66 using namespace std::chrono;
  67 using namespace std::placeholders;
  68 using namespace bmusb;
  69
  70 Mixer *global_mixer = nullptr;
  71
  72 namespace {
  73
  74 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  75 {
  76         if (interlaced) {
  77                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  78                         input_state->buffered_frames[card_index][frame_num] =
  79                                 input_state->buffered_frames[card_index][frame_num - 1];
  80                 }
  81                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  82         } else {
  83                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  84                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  85                 }
  86         }
  87 }
  88
  89 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
  90 {
  91         bool first;
  92         switch (userdata->pixel_format) {
  93         case PixelFormat_10BitYCbCr:
  94                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  95                 break;
  96         case PixelFormat_8BitYCbCr:
  97                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
  98                 break;
  99         case PixelFormat_8BitBGRA:
 100                 first = userdata->tex_rgba[field] == 0;
 101                 break;
 102         case PixelFormat_8BitYCbCrPlanar:
 103                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 104                 break;
 105         default:
 106                 assert(false);
 107         }
 108
 109         if (first ||
 110             width != userdata->last_width[field] ||
 111             height != userdata->last_height[field] ||
 112             cbcr_width != userdata->last_cbcr_width[field] ||
 113             cbcr_height != userdata->last_cbcr_height[field]) {
 114                 // We changed resolution since last use of this texture, so we need to create
 115                 // a new object. Note that this each card has its own PBOFrameAllocator,
 116                 // we don't need to worry about these flip-flopping between resolutions.
 117                 switch (userdata->pixel_format) {
 118                 case PixelFormat_10BitYCbCr:
 119                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 120                         check_error();
 121                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 122                         check_error();
 123                         break;
 124                 case PixelFormat_8BitYCbCr: {
 125                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 126                         check_error();
 127                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 128                         check_error();
 129                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 130                         check_error();
 131                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 132                         check_error();
 133                         break;
 134                 }
 135                 case PixelFormat_8BitYCbCrPlanar: {
 136                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 137                         check_error();
 138                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 139                         check_error();
 140                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 141                         check_error();
 142                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 143                         check_error();
 144                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 145                         check_error();
 146                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 147                         check_error();
 148                         break;
 149                 }
 150                 case PixelFormat_8BitBGRA:
 151                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 152                         check_error();
 153                         if (global_flags.can_disable_srgb_decoder) {  // See the comments in tweaked_inputs.h.
 154                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 155                         } else {
 156                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 157                         }
 158                         check_error();
 159                         break;
 160                 }
 161                 userdata->last_width[field] = width;
 162                 userdata->last_height[field] = height;
 163                 userdata->last_cbcr_width[field] = cbcr_width;
 164                 userdata->last_cbcr_height[field] = cbcr_height;
 165         }
 166         if (global_flags.ten_bit_input &&
 167             (first || v210_width != userdata->last_v210_width[field])) {
 168                 // Same as above; we need to recreate the texture.
 169                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 170                 check_error();
 171                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 172                 check_error();
 173                 userdata->last_v210_width[field] = v210_width;
 174         }
 175 }
 176
 177 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 178 {
 179         if (interlaced_stride) {
 180                 stride *= 2;
 181         }
 182         if (global_flags.flush_pbos) {
 183                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 184                 check_error();
 185         }
 186
 187         glBindTexture(GL_TEXTURE_2D, tex);
 188         check_error();
 189         if (interlaced_stride) {
 190                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 191                 check_error();
 192         } else {
 193                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 194                 check_error();
 195         }
 196
 197         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 198         check_error();
 199         glBindTexture(GL_TEXTURE_2D, 0);
 200         check_error();
 201         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 202         check_error();
 203 }
 204
 205 }  // namespace
 206
 207 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 208 {
 209         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 210         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 211 }
 212
 213 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 214 {
 215         global_metrics.remove("input_underestimated_jitter_frames", labels);
 216         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 217 }
 218
 219 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 220 {
 221         if (expected_timestamp > steady_clock::time_point::min()) {
 222                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 223                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 224                 history.push_back(orders.insert(jitter_seconds));
 225                 if (jitter_seconds > estimate_max_jitter()) {
 226                         ++metric_input_underestimated_jitter_frames;
 227                 }
 228
 229                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 230
 231                 if (history.size() > history_length) {
 232                         orders.erase(history.front());
 233                         history.pop_front();
 234                 }
 235                 assert(history.size() <= history_length);
 236         }
 237         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 238 }
 239
 240 double JitterHistory::estimate_max_jitter() const
 241 {
 242         if (orders.empty()) {
 243                 return 0.0;
 244         }
 245         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 246         if (percentile <= 0.5) {
 247                 return *next(orders.begin(), elem_idx) * multiplier;
 248         } else {
 249                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 250         }
 251 }
 252
 253 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 254 {
 255         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 256 }
 257
 258 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 259 {
 260         global_metrics.remove("input_queue_safe_length_frames", labels);
 261 }
 262
 263 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 264                                       steady_clock::time_point expected_next_frame,
 265                                       int64_t input_frame_duration,
 266                                       int64_t master_frame_duration,
 267                                       double max_input_card_jitter_seconds,
 268                                       double max_master_card_jitter_seconds)
 269 {
 270         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 271         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 272
 273         // Figure out when we can expect the next frame for this card, assuming
 274         // worst-case jitter (ie., the frame is maximally late).
 275         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 276
 277         // How many times are the master card expected to tick in that time?
 278         // We assume the master clock has worst-case jitter but not any rate
 279         // discrepancy, ie., it ticks as early as possible every time, but not
 280         // cumulatively.
 281         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 282
 283         // As a special case, if the master card ticks faster than the input card,
 284         // we expect the queue to drain by itself even without dropping. But if
 285         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 286         // go slowly enough that the effect wouldn't really be appreciable.
 287         // We account for this by looking at the situation five frames ahead,
 288         // assuming everything else is the same.
 289         double frames_allowed;
 290         if (master_frame_duration < input_frame_duration) {
 291                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 292         } else {
 293                 frames_allowed = frames_needed;
 294         }
 295
 296         safe_queue_length = max<int>(floor(frames_allowed), 0);
 297         metric_input_queue_safe_length_frames = safe_queue_length;
 298 }
 299
 300 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 301         : httpd(),
 302           num_cards(num_cards),
 303           mixer_surface(create_surface(format)),
 304           h264_encoder_surface(create_surface(format)),
 305           decklink_output_surface(create_surface(format)),
 306           audio_mixer(num_cards)
 307 {
 308         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 309         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 310         check_error();
 311
 312         // This nearly always should be true.
 313         global_flags.can_disable_srgb_decoder =
 314                 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
 315                 epoxy_has_gl_extension("GL_ARB_sampler_objects");
 316
 317         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 318         // will be halved when sampling them, and we need to compensate here.
 319         movit_texel_subpixel_precision /= 2.0;
 320
 321         resource_pool.reset(new ResourcePool);
 322         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 323                 output_channel[i].parent = this;
 324                 output_channel[i].channel = i;
 325         }
 326
 327         ImageFormat inout_format;
 328         inout_format.color_space = COLORSPACE_sRGB;
 329         inout_format.gamma_curve = GAMMA_sRGB;
 330
 331         // Matches the 4:2:0 format created by the main chain.
 332         YCbCrFormat ycbcr_format;
 333         ycbcr_format.chroma_subsampling_x = 2;
 334         ycbcr_format.chroma_subsampling_y = 2;
 335         if (global_flags.ycbcr_rec709_coefficients) {
 336                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 337         } else {
 338                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 339         }
 340         ycbcr_format.full_range = false;
 341         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 342         ycbcr_format.cb_x_position = 0.0f;
 343         ycbcr_format.cr_x_position = 0.0f;
 344         ycbcr_format.cb_y_position = 0.5f;
 345         ycbcr_format.cr_y_position = 0.5f;
 346
 347         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 348         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 349         check_error();
 350         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 351         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 352         display_chain->add_input(display_input);
 353         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 354         display_chain->set_dither_bits(0);  // Don't bother.
 355         display_chain->finalize();
 356
 357         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));
 358
 359         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 360         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 361
 362         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 363         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
 364                 char url[256];
 365                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
 366                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
 367         }
 368
 369         // Start listening for clients only once VideoEncoder has written its header, if any.
 370         httpd.start(global_flags.http_port);
 371
 372         // First try initializing the then PCI devices, then USB, then
 373         // fill up with fake cards until we have the desired number of cards.
 374         unsigned num_pci_devices = 0;
 375         unsigned card_index = 0;
 376
 377         {
 378                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 379                 if (decklink_iterator != nullptr) {
 380                         for ( ; card_index < num_cards; ++card_index) {
 381                                 IDeckLink *decklink;
 382                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 383                                         break;
 384                                 }
 385
 386                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 387                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 388                                 if (!output->set_device(decklink)) {
 389                                         delete output;
 390                                         output = nullptr;
 391                                 }
 392                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 393                                 ++num_pci_devices;
 394                         }
 395                         decklink_iterator->Release();
 396                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 397                 } else {
 398                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 399                 }
 400         }
 401
 402         unsigned num_usb_devices = BMUSBCapture::num_cards();
 403         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 404                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 405                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 406                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 407         }
 408         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 409
 410         unsigned num_fake_cards = 0;
 411         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 412                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 413                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 414         }
 415
 416         if (num_fake_cards > 0) {
 417                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 418         }
 419
 420         // Initialize all video inputs the theme asked for. Note that these are
 421         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 422         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 423         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 424                 if (card_index >= MAX_VIDEO_CARDS) {
 425                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 426                         exit(1);
 427                 }
 428                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 429                 video_inputs[video_card_index]->set_card_index(card_index);
 430         }
 431         num_video_inputs = video_inputs.size();
 432
 433 #ifdef HAVE_CEF
 434         // Same, for HTML inputs.
 435         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 436         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 437                 if (card_index >= MAX_VIDEO_CARDS) {
 438                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 439                         exit(1);
 440                 }
 441                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
 442                 html_inputs[html_card_index]->set_card_index(card_index);
 443         }
 444         num_html_inputs = html_inputs.size();
 445 #endif
 446
 447         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 448         BMUSBCapture::start_bm_thread();
 449
 450         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 451                 cards[card_index].queue_length_policy.reset(card_index);
 452         }
 453
 454         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 455
 456         if (global_flags.ten_bit_input) {
 457                 if (!v210Converter::has_hardware_support()) {
 458                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 459                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 460                         exit(1);
 461                 }
 462                 v210_converter.reset(new v210Converter());
 463
 464                 // These are all the widths listed in the Blackmagic SDK documentation
 465                 // (section 2.7.3, “Display Modes”).
 466                 v210_converter->precompile_shader(720);
 467                 v210_converter->precompile_shader(1280);
 468                 v210_converter->precompile_shader(1920);
 469                 v210_converter->precompile_shader(2048);
 470                 v210_converter->precompile_shader(3840);
 471                 v210_converter->precompile_shader(4096);
 472         }
 473         if (global_flags.ten_bit_output) {
 474                 if (!v210Converter::has_hardware_support()) {
 475                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 476                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 477                         exit(1);
 478                 }
 479         }
 480
 481         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 482         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 483         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 484
 485         if (global_flags.enable_alsa_output) {
 486                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 487         }
 488         if (global_flags.output_card != -1) {
 489                 desired_output_card_index = global_flags.output_card;
 490                 set_output_card_internal(global_flags.output_card);
 491         }
 492
 493         output_jitter_history.register_metrics({{ "card", "output" }});
 494 }
 495
 496 Mixer::~Mixer()
 497 {
 498         BMUSBCapture::stop_bm_thread();
 499
 500         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 501                 {
 502                         unique_lock<mutex> lock(card_mutex);
 503                         cards[card_index].should_quit = true;  // Unblock thread.
 504                         cards[card_index].new_frames_changed.notify_all();
 505                 }
 506                 cards[card_index].capture->stop_dequeue_thread();
 507                 if (cards[card_index].output) {
 508                         cards[card_index].output->end_output();
 509                         cards[card_index].output.reset();
 510                 }
 511         }
 512
 513         video_encoder.reset(nullptr);
 514 }
 515
 516 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 517 {
 518         printf("Configuring card %d...\n", card_index);
 519
 520         CaptureCard *card = &cards[card_index];
 521         if (card->capture != nullptr) {
 522                 card->capture->stop_dequeue_thread();
 523         }
 524         card->capture.reset(capture);
 525         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 526         card->type = card_type;
 527         if (card->output.get() != output) {
 528                 card->output.reset(output);
 529         }
 530
 531         PixelFormat pixel_format;
 532         if (card_type == CardType::FFMPEG_INPUT) {
 533                 pixel_format = capture->get_current_pixel_format();
 534         } else if (card_type == CardType::CEF_INPUT) {
 535                 pixel_format = PixelFormat_8BitBGRA;
 536         } else if (global_flags.ten_bit_input) {
 537                 pixel_format = PixelFormat_10BitYCbCr;
 538         } else {
 539                 pixel_format = PixelFormat_8BitYCbCr;
 540         }
 541
 542         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 543         if (card->frame_allocator == nullptr) {
 544                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 545         }
 546         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 547         if (card->surface == nullptr) {
 548                 card->surface = create_surface_with_same_format(mixer_surface);
 549         }
 550         while (!card->new_frames.empty()) card->new_frames.pop_front();
 551         card->last_timecode = -1;
 552         card->capture->set_pixel_format(pixel_format);
 553         card->capture->configure_card();
 554
 555         // NOTE: start_bm_capture() happens in thread_func().
 556
 557         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 558         audio_mixer.reset_resampler(device);
 559         audio_mixer.set_display_name(device, card->capture->get_description());
 560         audio_mixer.trigger_state_changed_callback();
 561
 562         // Unregister old metrics, if any.
 563         if (!card->labels.empty()) {
 564                 const vector<pair<string, string>> &labels = card->labels;
 565                 card->jitter_history.unregister_metrics(labels);
 566                 card->queue_length_policy.unregister_metrics(labels);
 567                 global_metrics.remove("input_received_frames", labels);
 568                 global_metrics.remove("input_dropped_frames_jitter", labels);
 569                 global_metrics.remove("input_dropped_frames_error", labels);
 570                 global_metrics.remove("input_dropped_frames_resets", labels);
 571                 global_metrics.remove("input_queue_length_frames", labels);
 572                 global_metrics.remove("input_queue_duped_frames", labels);
 573
 574                 global_metrics.remove("input_has_signal_bool", labels);
 575                 global_metrics.remove("input_is_connected_bool", labels);
 576                 global_metrics.remove("input_interlaced_bool", labels);
 577                 global_metrics.remove("input_width_pixels", labels);
 578                 global_metrics.remove("input_height_pixels", labels);
 579                 global_metrics.remove("input_frame_rate_nom", labels);
 580                 global_metrics.remove("input_frame_rate_den", labels);
 581                 global_metrics.remove("input_sample_rate_hz", labels);
 582         }
 583
 584         // Register metrics.
 585         vector<pair<string, string>> labels;
 586         char card_name[64];
 587         snprintf(card_name, sizeof(card_name), "%d", card_index);
 588         labels.emplace_back("card", card_name);
 589
 590         switch (card_type) {
 591         case CardType::LIVE_CARD:
 592                 labels.emplace_back("cardtype", "live");
 593                 break;
 594         case CardType::FAKE_CAPTURE:
 595                 labels.emplace_back("cardtype", "fake");
 596                 break;
 597         case CardType::FFMPEG_INPUT:
 598                 labels.emplace_back("cardtype", "ffmpeg");
 599                 break;
 600         case CardType::CEF_INPUT:
 601                 labels.emplace_back("cardtype", "cef");
 602                 break;
 603         default:
 604                 assert(false);
 605         }
 606         card->jitter_history.register_metrics(labels);
 607         card->queue_length_policy.register_metrics(labels);
 608         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 609         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 610         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 611         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 612         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 613         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 614
 615         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 616         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 617         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 618         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 619         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 620         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 621         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 622         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 623         card->labels = labels;
 624 }
 625
 626 void Mixer::set_output_card_internal(int card_index)
 627 {
 628         // We don't really need to take card_mutex, since we're in the mixer
 629         // thread and don't mess with any queues (which is the only thing that happens
 630         // from other threads), but it's probably the safest in the long run.
 631         unique_lock<mutex> lock(card_mutex);
 632         if (output_card_index != -1) {
 633                 // Switch the old card from output to input.
 634                 CaptureCard *old_card = &cards[output_card_index];
 635                 old_card->output->end_output();
 636
 637                 // Stop the fake card that we put into place.
 638                 // This needs to _not_ happen under the mutex, to avoid deadlock
 639                 // (delivering the last frame needs to take the mutex).
 640                 CaptureInterface *fake_capture = old_card->capture.get();
 641                 lock.unlock();
 642                 fake_capture->stop_dequeue_thread();
 643                 lock.lock();
 644                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 645                 old_card->is_fake_capture = false;
 646                 old_card->capture->start_bm_capture();
 647         }
 648         if (card_index != -1) {
 649                 CaptureCard *card = &cards[card_index];
 650                 CaptureInterface *capture = card->capture.get();
 651                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 652                 // several seconds to complete (blocking on DisableVideoInput);
 653                 // see if we can maybe do it asynchronously.
 654                 lock.unlock();
 655                 capture->stop_dequeue_thread();
 656                 lock.lock();
 657                 card->parked_capture = move(card->capture);
 658                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 659                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 660                 card->queue_length_policy.reset(card_index);
 661                 card->capture->start_bm_capture();
 662                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 663                 card->output->start_output(desired_output_video_mode, pts_int);
 664         }
 665         output_card_index = card_index;
 666         output_jitter_history.clear();
 667 }
 668
 669 namespace {
 670
 671 int unwrap_timecode(uint16_t current_wrapped, int last)
 672 {
 673         uint16_t last_wrapped = last & 0xffff;
 674         if (current_wrapped > last_wrapped) {
 675                 return (last & ~0xffff) | current_wrapped;
 676         } else {
 677                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 678         }
 679 }
 680
 681 }  // namespace
 682
 683 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 684                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 685                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 686 {
 687         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 688         CaptureCard *card = &cards[card_index];
 689
 690         ++card->metric_input_received_frames;
 691         card->metric_input_has_signal_bool = video_format.has_signal;
 692         card->metric_input_is_connected_bool = video_format.is_connected;
 693         card->metric_input_interlaced_bool = video_format.interlaced;
 694         card->metric_input_width_pixels = video_format.width;
 695         card->metric_input_height_pixels = video_format.height;
 696         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 697         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 698         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 699
 700         if (is_mode_scanning[card_index]) {
 701                 if (video_format.has_signal) {
 702                         // Found a stable signal, so stop scanning.
 703                         is_mode_scanning[card_index] = false;
 704                 } else {
 705                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 706                         steady_clock::time_point now = steady_clock::now();
 707                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 708                         if (sec_since_last_switch > switch_time_s) {
 709                                 // It isn't this mode; try the next one.
 710                                 mode_scanlist_index[card_index]++;
 711                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 712                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 713                                 last_mode_scan_change[card_index] = now;
 714                         }
 715                 }
 716         }
 717
 718         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 719         assert(frame_length > 0);
 720
 721         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;
 722         if (num_samples > OUTPUT_FREQUENCY / 10) {
 723                 printf("Card %d: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
 724                         card_index, int(audio_frame.len), int(audio_offset),
 725                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 726                 if (video_frame.owner) {
 727                         video_frame.owner->release_frame(video_frame);
 728                 }
 729                 if (audio_frame.owner) {
 730                         audio_frame.owner->release_frame(audio_frame);
 731                 }
 732                 return;
 733         }
 734
 735         int dropped_frames = 0;
 736         if (card->last_timecode != -1) {
 737                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 738         }
 739
 740         // Number of samples per frame if we need to insert silence.
 741         // (Could be nonintegral, but resampling will save us then.)
 742         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 743
 744         if (dropped_frames > MAX_FPS * 2) {
 745                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 746                         card_index, card->last_timecode, timecode);
 747                 audio_mixer.reset_resampler(device);
 748                 dropped_frames = 0;
 749                 ++card->metric_input_resets;
 750         } else if (dropped_frames > 0) {
 751                 // Insert silence as needed.
 752                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 753                         card_index, dropped_frames, timecode);
 754                 card->metric_input_dropped_frames_error += dropped_frames;
 755
 756                 bool success;
 757                 do {
 758                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 759                 } while (!success);
 760         }
 761
 762         if (num_samples > 0) {
 763                 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 764         }
 765
 766         // Done with the audio, so release it.
 767         if (audio_frame.owner) {
 768                 audio_frame.owner->release_frame(audio_frame);
 769         }
 770
 771         card->last_timecode = timecode;
 772
 773         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 774
 775         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 776         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 777         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 778                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 779                 assert(card->type == CardType::FFMPEG_INPUT);
 780                 assert(video_offset == 0);
 781                 expected_length = video_frame.len;
 782
 783                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 784                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 785                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 786                 cbcr_offset = video_format.width * video_format.height;
 787                 y_offset = 0;
 788         } else {
 789                 // All the other Y'CbCr formats are 4:2:2.
 790                 cbcr_width = video_format.width / 2;
 791                 cbcr_height = video_format.height;
 792                 cbcr_offset = video_offset / 2;
 793                 y_offset = video_frame.size / 2 + video_offset / 2;
 794         }
 795         if (video_frame.len - video_offset == 0 ||
 796             video_frame.len - video_offset != expected_length) {
 797                 if (video_frame.len != 0) {
 798                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 799                                 card_index, video_frame.len - video_offset, expected_length);
 800                 }
 801                 if (video_frame.owner) {
 802                         video_frame.owner->release_frame(video_frame);
 803                 }
 804
 805                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 806                 // so that pts can go up accordingly.
 807                 {
 808                         unique_lock<mutex> lock(card_mutex);
 809                         CaptureCard::NewFrame new_frame;
 810                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 811                         new_frame.length = frame_length;
 812                         new_frame.interlaced = false;
 813                         new_frame.dropped_frames = dropped_frames;
 814                         new_frame.received_timestamp = video_frame.received_timestamp;
 815                         card->new_frames.push_back(move(new_frame));
 816                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 817                 }
 818                 card->new_frames_changed.notify_all();
 819                 return;
 820         }
 821
 822         unsigned num_fields = video_format.interlaced ? 2 : 1;
 823         steady_clock::time_point frame_upload_start;
 824         bool interlaced_stride = false;
 825         if (video_format.interlaced) {
 826                 // Send the two fields along as separate frames; the other side will need to add
 827                 // a deinterlacer to actually get this right.
 828                 assert(video_format.height % 2 == 0);
 829                 video_format.height /= 2;
 830                 cbcr_height /= 2;
 831                 assert(frame_length % 2 == 0);
 832                 frame_length /= 2;
 833                 num_fields = 2;
 834                 if (video_format.second_field_start == 1) {
 835                         interlaced_stride = true;
 836                 }
 837                 frame_upload_start = steady_clock::now();
 838         }
 839         userdata->last_interlaced = video_format.interlaced;
 840         userdata->last_has_signal = video_format.has_signal;
 841         userdata->last_is_connected = video_format.is_connected;
 842         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 843         userdata->last_frame_rate_den = video_format.frame_rate_den;
 844         RefCountedFrame frame(video_frame);
 845
 846         // Upload the textures.
 847         for (unsigned field = 0; field < num_fields; ++field) {
 848                 // Put the actual texture upload in a lambda that is executed in the main thread.
 849                 // It is entirely possible to do this in the same thread (and it might even be
 850                 // faster, depending on the GPU and driver), but it appears to be trickling
 851                 // driver bugs very easily.
 852                 //
 853                 // Note that this means we must hold on to the actual frame data in <userdata>
 854                 // until the upload command is run, but we hold on to <frame> much longer than that
 855                 // (in fact, all the way until we no longer use the texture in rendering).
 856                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 857                         unsigned field_start_line;
 858                         if (field == 1) {
 859                                 field_start_line = video_format.second_field_start;
 860                         } else {
 861                                 field_start_line = video_format.extra_lines_top;
 862                         }
 863
 864                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 865                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 866                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 867
 868                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 869                         check_error();
 870
 871                         switch (userdata->pixel_format) {
 872                         case PixelFormat_10BitYCbCr: {
 873                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 874                                 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);
 875                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 876                                 break;
 877                         }
 878                         case PixelFormat_8BitYCbCr: {
 879                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 880                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 881
 882                                 // Make up our own strides, since we are interleaving.
 883                                 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);
 884                                 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);
 885                                 break;
 886                         }
 887                         case PixelFormat_8BitYCbCrPlanar: {
 888                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 889                                 size_t field_y_start = y_offset;
 890                                 size_t field_cb_start = cbcr_offset;
 891                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 892
 893                                 // Make up our own strides, since we are interleaving.
 894                                 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);
 895                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 896                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 897                                 break;
 898                         }
 899                         case PixelFormat_8BitBGRA: {
 900                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 901                                 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);
 902                                 // These could be asked to deliver mipmaps at any time.
 903                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 904                                 check_error();
 905                                 glGenerateMipmap(GL_TEXTURE_2D);
 906                                 check_error();
 907                                 glBindTexture(GL_TEXTURE_2D, 0);
 908                                 check_error();
 909                                 break;
 910                         }
 911                         default:
 912                                 assert(false);
 913                         }
 914
 915                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 916                         check_error();
 917                 };
 918
 919                 if (field == 1) {
 920                         // Don't upload the second field as fast as we can; wait until
 921                         // the field time has approximately passed. (Otherwise, we could
 922                         // get timing jitter against the other sources, and possibly also
 923                         // against the video display, although the latter is not as critical.)
 924                         // This requires our system clock to be reasonably close to the
 925                         // video clock, but that's not an unreasonable assumption.
 926                         steady_clock::time_point second_field_start = frame_upload_start +
 927                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 928                         this_thread::sleep_until(second_field_start);
 929                 }
 930
 931                 {
 932                         unique_lock<mutex> lock(card_mutex);
 933                         CaptureCard::NewFrame new_frame;
 934                         new_frame.frame = frame;
 935                         new_frame.length = frame_length;
 936                         new_frame.field = field;
 937                         new_frame.interlaced = video_format.interlaced;
 938                         new_frame.upload_func = upload_func;
 939                         new_frame.dropped_frames = dropped_frames;
 940                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 941                         card->new_frames.push_back(move(new_frame));
 942                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 943                 }
 944                 card->new_frames_changed.notify_all();
 945         }
 946 }
 947
 948 void Mixer::bm_hotplug_add(libusb_device *dev)
 949 {
 950         lock_guard<mutex> lock(hotplug_mutex);
 951         hotplugged_cards.push_back(dev);
 952 }
 953
 954 void Mixer::bm_hotplug_remove(unsigned card_index)
 955 {
 956         cards[card_index].new_frames_changed.notify_all();
 957 }
 958
 959 void Mixer::thread_func()
 960 {
 961         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 962
 963         eglBindAPI(EGL_OPENGL_API);
 964         QOpenGLContext *context = create_context(mixer_surface);
 965         if (!make_current(context, mixer_surface)) {
 966                 printf("oops\n");
 967                 exit(1);
 968         }
 969
 970         // Start the actual capture. (We don't want to do it before we're actually ready
 971         // to process output frames.)
 972         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 973                 if (int(card_index) != output_card_index) {
 974                         cards[card_index].capture->start_bm_capture();
 975                 }
 976         }
 977
 978         BasicStats basic_stats(/*verbose=*/true);
 979         int stats_dropped_frames = 0;
 980
 981         while (!should_quit) {
 982                 if (desired_output_card_index != output_card_index) {
 983                         set_output_card_internal(desired_output_card_index);
 984                 }
 985                 if (output_card_index != -1 &&
 986                     desired_output_video_mode != output_video_mode) {
 987                         DeckLinkOutput *output = cards[output_card_index].output.get();
 988                         output->end_output();
 989                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 990                         output->start_output(desired_output_video_mode, pts_int);
 991                 }
 992
 993                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 994                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 995
 996                 bool master_card_is_output;
 997                 unsigned master_card_index;
 998                 if (output_card_index != -1) {
 999                         master_card_is_output = true;
1000                         master_card_index = output_card_index;
1001                 } else {
1002                         master_card_is_output = false;
1003                         master_card_index = theme->map_signal(master_clock_channel);
1004                         assert(master_card_index < num_cards);
1005                 }
1006
1007                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1008                 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);
1009                 stats_dropped_frames += output_frame_info.dropped_frames;
1010
1011                 handle_hotplugged_cards();
1012
1013                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1014                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1015                                 continue;
1016                         }
1017                         if (new_frames[card_index].frame->len == 0) {
1018                                 ++new_frames[card_index].dropped_frames;
1019                         }
1020                         if (new_frames[card_index].dropped_frames > 0) {
1021                                 printf("Card %u dropped %d frames before this\n",
1022                                         card_index, int(new_frames[card_index].dropped_frames));
1023                         }
1024                 }
1025
1026                 // If the first card is reporting a corrupted or otherwise dropped frame,
1027                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1028                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1029                         ++stats_dropped_frames;
1030                         pts_int += new_frames[master_card_index].length;
1031                         continue;
1032                 }
1033
1034                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1035                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1036                                 continue;
1037
1038                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1039                         assert(new_frame->frame != nullptr);
1040                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1041                         check_error();
1042
1043                         // The new texture might need uploading before use.
1044                         if (new_frame->upload_func) {
1045                                 new_frame->upload_func();
1046                                 new_frame->upload_func = nullptr;
1047                         }
1048                 }
1049
1050                 int64_t frame_duration = output_frame_info.frame_duration;
1051                 render_one_frame(frame_duration);
1052                 ++frame_num;
1053                 pts_int += frame_duration;
1054
1055                 basic_stats.update(frame_num, stats_dropped_frames);
1056                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1057
1058                 if (should_cut.exchange(false)) {  // Test and clear.
1059                         video_encoder->do_cut(frame_num);
1060                 }
1061
1062 #if 0
1063                 // Reset every 100 frames, so that local variations in frame times
1064                 // (especially for the first few frames, when the shaders are
1065                 // compiled etc.) don't make it hard to measure for the entire
1066                 // remaining duration of the program.
1067                 if (frame == 10000) {
1068                         frame = 0;
1069                         start = now;
1070                 }
1071 #endif
1072                 check_error();
1073         }
1074
1075         resource_pool->clean_context();
1076 }
1077
1078 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1079 {
1080         if (output_card_index != -1) {
1081                 // The output card (ie., cards[output_card_index].output) is the master clock,
1082                 // so no input card (ie., cards[card_index].capture) is.
1083                 return false;
1084         }
1085         return (card_index == master_card_index);
1086 }
1087
1088 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1089 {
1090         // Count the number of frames in the queue, including any frames
1091         // we dropped. It's hard to know exactly how we should deal with
1092         // dropped (corrupted) input frames; they don't help our goal of
1093         // avoiding starvation, but they still add to the problem of latency.
1094         // Since dropped frames is going to mean a bump in the signal anyway,
1095         // we err on the side of having more stable latency instead.
1096         unsigned queue_length = 0;
1097         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1098                 queue_length += frame.dropped_frames + 1;
1099         }
1100
1101         // If needed, drop frames until the queue is below the safe limit.
1102         // We prefer to drop from the head, because all else being equal,
1103         // we'd like more recent frames (less latency).
1104         unsigned dropped_frames = 0;
1105         while (queue_length > safe_queue_length) {
1106                 assert(!card->new_frames.empty());
1107                 assert(queue_length > card->new_frames.front().dropped_frames);
1108                 queue_length -= card->new_frames.front().dropped_frames;
1109
1110                 if (queue_length <= safe_queue_length) {
1111                         // No need to drop anything.
1112                         break;
1113                 }
1114
1115                 card->new_frames.pop_front();
1116                 card->new_frames_changed.notify_all();
1117                 --queue_length;
1118                 ++dropped_frames;
1119         }
1120
1121         card->metric_input_dropped_frames_jitter += dropped_frames;
1122         card->metric_input_queue_length_frames = queue_length;
1123
1124 #if 0
1125         if (dropped_frames > 0) {
1126                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1127                         card_index, dropped_frames);
1128         }
1129 #endif
1130 }
1131
1132 pair<string, string> Mixer::get_channels_json()
1133 {
1134         Channels ret;
1135         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1136                 Channel *channel = ret.add_channel();
1137                 channel->set_index(channel_idx);
1138                 channel->set_name(theme->get_channel_name(channel_idx));
1139                 channel->set_color(theme->get_channel_color(channel_idx));
1140         }
1141         string contents;
1142         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1143         return make_pair(contents, "text/json");
1144 }
1145
1146 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1147 {
1148         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1149 }
1150
1151 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])
1152 {
1153         OutputFrameInfo output_frame_info;
1154 start:
1155         unique_lock<mutex> lock(card_mutex, defer_lock);
1156         if (master_card_is_output) {
1157                 // Clocked to the output, so wait for it to be ready for the next frame.
1158                 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);
1159                 lock.lock();
1160         } else {
1161                 // Wait for the master card to have a new frame.
1162                 // TODO: Add a timeout.
1163                 output_frame_info.is_preroll = false;
1164                 lock.lock();
1165                 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(); });
1166         }
1167
1168         if (master_card_is_output) {
1169                 handle_hotplugged_cards();
1170         } else if (cards[master_card_index].new_frames.empty()) {
1171                 // We were woken up, but not due to a new frame. Deal with it
1172                 // and then restart.
1173                 assert(cards[master_card_index].capture->get_disconnected());
1174                 handle_hotplugged_cards();
1175                 lock.unlock();
1176                 goto start;
1177         }
1178
1179         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1180                 CaptureCard *card = &cards[card_index];
1181                 if (card->new_frames.empty()) {  // Starvation.
1182                         ++card->metric_input_duped_frames;
1183                 } else {
1184                         new_frames[card_index] = move(card->new_frames.front());
1185                         has_new_frame[card_index] = true;
1186                         card->new_frames.pop_front();
1187                         card->new_frames_changed.notify_all();
1188                 }
1189         }
1190
1191         if (!master_card_is_output) {
1192                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1193                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1194                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1195         }
1196
1197         if (!output_frame_info.is_preroll) {
1198                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1199         }
1200
1201         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1202                 CaptureCard *card = &cards[card_index];
1203                 if (has_new_frame[card_index] &&
1204                     !input_card_is_master_clock(card_index, master_card_index) &&
1205                     !output_frame_info.is_preroll) {
1206                         card->queue_length_policy.update_policy(
1207                                 output_frame_info.frame_timestamp,
1208                                 card->jitter_history.get_expected_next_frame(),
1209                                 new_frames[master_card_index].length,
1210                                 output_frame_info.frame_duration,
1211                                 card->jitter_history.estimate_max_jitter(),
1212                                 output_jitter_history.estimate_max_jitter());
1213                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1214                                                   card->queue_length_policy.get_safe_queue_length()));
1215                 }
1216         }
1217
1218         // This might get off by a fractional sample when changing master card
1219         // between ones with different frame rates, but that's fine.
1220         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1221         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1222         fractional_samples = num_samples_times_timebase % TIMEBASE;
1223         assert(output_frame_info.num_samples >= 0);
1224
1225         return output_frame_info;
1226 }
1227
1228 void Mixer::handle_hotplugged_cards()
1229 {
1230         // Check for cards that have been disconnected since last frame.
1231         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1232                 CaptureCard *card = &cards[card_index];
1233                 if (card->capture->get_disconnected()) {
1234                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1235                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1236                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1237                         card->queue_length_policy.reset(card_index);
1238                         card->capture->start_bm_capture();
1239                 }
1240         }
1241
1242         // Check for cards that have been connected since last frame.
1243         vector<libusb_device *> hotplugged_cards_copy;
1244         {
1245                 lock_guard<mutex> lock(hotplug_mutex);
1246                 swap(hotplugged_cards, hotplugged_cards_copy);
1247         }
1248         for (libusb_device *new_dev : hotplugged_cards_copy) {
1249                 // Look for a fake capture card where we can stick this in.
1250                 int free_card_index = -1;
1251                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1252                         if (cards[card_index].is_fake_capture) {
1253                                 free_card_index = card_index;
1254                                 break;
1255                         }
1256                 }
1257
1258                 if (free_card_index == -1) {
1259                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1260                         libusb_unref_device(new_dev);
1261                 } else {
1262                         // BMUSBCapture takes ownership.
1263                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1264                         CaptureCard *card = &cards[free_card_index];
1265                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1266                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1267                         card->queue_length_policy.reset(free_card_index);
1268                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1269                         capture->start_bm_capture();
1270                 }
1271         }
1272 }
1273
1274
1275 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)
1276 {
1277         // Resample the audio as needed, including from previously dropped frames.
1278         assert(num_cards > 0);
1279         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1280                 const bool dropped_frame = (frame_num != dropped_frames);
1281                 {
1282                         // Signal to the audio thread to process this frame.
1283                         // Note that if the frame is a dropped frame, we signal that
1284                         // we don't want to use this frame as base for adjusting
1285                         // the resampler rate. The reason for this is that the timing
1286                         // of these frames is often way too late; they typically don't
1287                         // “arrive” before we synthesize them. Thus, we could end up
1288                         // in a situation where we have inserted e.g. five audio frames
1289                         // into the queue before we then start pulling five of them
1290                         // back out. This makes ResamplingQueue overestimate the delay,
1291                         // causing undue resampler changes. (We _do_ use the last,
1292                         // non-dropped frame; perhaps we should just discard that as well,
1293                         // since dropped frames are expected to be rare, and it might be
1294                         // better to just wait until we have a slightly more normal situation).
1295                         unique_lock<mutex> lock(audio_mutex);
1296                         bool adjust_rate = !dropped_frame && !is_preroll;
1297                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1298                         audio_task_queue_changed.notify_one();
1299                 }
1300                 if (dropped_frame) {
1301                         // For dropped frames, increase the pts. Note that if the format changed
1302                         // in the meantime, we have no way of detecting that; we just have to
1303                         // assume the frame length is always the same.
1304                         pts_int += length_per_frame;
1305                 }
1306         }
1307 }
1308
1309 void Mixer::render_one_frame(int64_t duration)
1310 {
1311         // Determine the time code for this frame before we start rendering.
1312         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1313         if (display_timecode_on_stdout) {
1314                 printf("Timecode: '%s'\n", timecode_text.c_str());
1315         }
1316
1317         // Update Y'CbCr settings for all cards.
1318         {
1319                 unique_lock<mutex> lock(card_mutex);
1320                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1321                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1322                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1323                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1324                         input_state.full_range[card_index] = interpretation->full_range;
1325                 }
1326         }
1327
1328         // Get the main chain from the theme, and set its state immediately.
1329         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1330         EffectChain *chain = theme_main_chain.chain;
1331         theme_main_chain.setup_chain();
1332         //theme_main_chain.chain->enable_phase_timing(true);
1333
1334         // The theme can't (or at least shouldn't!) call connect_signal() on
1335         // each FFmpeg or CEF input, so we'll do it here.
1336         for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_video_signal_connections()) {
1337                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1338         }
1339 #ifdef HAVE_CEF
1340         for (const pair<LiveInputWrapper *, CEFCapture *> &conn : theme->get_html_signal_connections()) {
1341                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1342         }
1343 #endif
1344
1345         // If HDMI/SDI output is active and the user has requested auto mode,
1346         // its mode overrides the existing Y'CbCr setting for the chain.
1347         YCbCrLumaCoefficients ycbcr_output_coefficients;
1348         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1349                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1350         } else {
1351                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1352         }
1353
1354         // TODO: Reduce the duplication against theme.cpp.
1355         YCbCrFormat output_ycbcr_format;
1356         output_ycbcr_format.chroma_subsampling_x = 1;
1357         output_ycbcr_format.chroma_subsampling_y = 1;
1358         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1359         output_ycbcr_format.full_range = false;
1360         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1361         chain->change_ycbcr_output_format(output_ycbcr_format);
1362
1363         // Render main chain. If we're using zerocopy Quick Sync encoding
1364         // (the default case), we take an extra copy of the created outputs,
1365         // so that we can display it back to the screen later (it's less memory
1366         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1367         // Ideally, we'd like to avoid taking copies and just use the main textures
1368         // for display as well, but they're just views into VA-API memory and must be
1369         // unmapped during encoding, so we can't use them for display, unfortunately.
1370         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1371         GLuint y_copy_tex, cbcr_copy_tex = 0;
1372         GLuint y_display_tex, cbcr_display_tex;
1373         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1374         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1375         const bool is_zerocopy = video_encoder->is_zerocopy();
1376         if (is_zerocopy) {
1377                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1378                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1379                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1380
1381                 y_display_tex = y_copy_tex;
1382                 cbcr_display_tex = cbcr_copy_tex;
1383
1384                 // y_tex and cbcr_tex will be given by VideoEncoder.
1385         } else {
1386                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1387                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1388                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1389
1390                 y_display_tex = y_tex;
1391                 cbcr_display_tex = cbcr_tex;
1392         }
1393
1394         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1395         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1396         assert(got_frame);
1397
1398         GLuint fbo;
1399         if (is_zerocopy) {
1400                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1401         } else {
1402                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1403         }
1404         check_error();
1405         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1406
1407         if (display_timecode_in_stream) {
1408                 // Render the timecode on top.
1409                 timecode_renderer->render_timecode(fbo, timecode_text);
1410         }
1411
1412         resource_pool->release_fbo(fbo);
1413
1414         if (is_zerocopy) {
1415                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1416         } else {
1417                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1418         }
1419         if (output_card_index != -1) {
1420                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1421         }
1422         resource_pool->release_2d_texture(cbcr_full_tex);
1423
1424         // Set the right state for the Y' and CbCr textures we use for display.
1425         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1426         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1427         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1428         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1429         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1430
1431         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1432         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1433         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1434         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1435
1436         RefCountedGLsync fence = video_encoder->end_frame();
1437
1438         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1439         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1440         DisplayFrame live_frame;
1441         live_frame.chain = display_chain.get();
1442         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1443                 display_input->set_texture_num(0, y_display_tex);
1444                 display_input->set_texture_num(1, cbcr_display_tex);
1445         };
1446         live_frame.ready_fence = fence;
1447         live_frame.input_frames = {};
1448         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1449         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1450
1451         // Set up preview and any additional channels.
1452         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1453                 DisplayFrame display_frame;
1454                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1455                 display_frame.chain = move(chain.chain);
1456                 display_frame.setup_chain = move(chain.setup_chain);
1457                 display_frame.ready_fence = fence;
1458                 display_frame.input_frames = move(chain.input_frames);
1459                 display_frame.temp_textures = {};
1460                 output_channel[i].output_frame(move(display_frame));
1461         }
1462 }
1463
1464 void Mixer::audio_thread_func()
1465 {
1466         pthread_setname_np(pthread_self(), "Mixer_Audio");
1467
1468         while (!should_quit) {
1469                 AudioTask task;
1470
1471                 {
1472                         unique_lock<mutex> lock(audio_mutex);
1473                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1474                         if (should_quit) {
1475                                 return;
1476                         }
1477                         task = audio_task_queue.front();
1478                         audio_task_queue.pop();
1479                 }
1480
1481                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1482                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1483                 vector<float> samples_out = audio_mixer.get_output(
1484                         task.frame_timestamp,
1485                         task.num_samples,
1486                         rate_adjustment_policy);
1487
1488                 // Send the samples to the sound card, then add them to the output.
1489                 if (alsa) {
1490                         alsa->write(samples_out);
1491                 }
1492                 if (output_card_index != -1) {
1493                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1494                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1495                 }
1496                 video_encoder->add_audio(task.pts_int, move(samples_out));
1497         }
1498 }
1499
1500 void Mixer::release_display_frame(DisplayFrame *frame)
1501 {
1502         for (GLuint texnum : frame->temp_textures) {
1503                 resource_pool->release_2d_texture(texnum);
1504         }
1505         frame->temp_textures.clear();
1506         frame->ready_fence.reset();
1507         frame->input_frames.clear();
1508 }
1509
1510 void Mixer::start()
1511 {
1512         mixer_thread = thread(&Mixer::thread_func, this);
1513         audio_thread = thread(&Mixer::audio_thread_func, this);
1514 }
1515
1516 void Mixer::quit()
1517 {
1518         should_quit = true;
1519         audio_task_queue_changed.notify_one();
1520         mixer_thread.join();
1521         audio_thread.join();
1522 }
1523
1524 void Mixer::transition_clicked(int transition_num)
1525 {
1526         theme->transition_clicked(transition_num, pts());
1527 }
1528
1529 void Mixer::channel_clicked(int preview_num)
1530 {
1531         theme->channel_clicked(preview_num);
1532 }
1533
1534 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1535 {
1536         unique_lock<mutex> lock(card_mutex);
1537         return ycbcr_interpretation[card_index];
1538 }
1539
1540 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1541 {
1542         unique_lock<mutex> lock(card_mutex);
1543         ycbcr_interpretation[card_index] = interpretation;
1544 }
1545
1546 void Mixer::start_mode_scanning(unsigned card_index)
1547 {
1548         assert(card_index < num_cards);
1549         if (is_mode_scanning[card_index]) {
1550                 return;
1551         }
1552         is_mode_scanning[card_index] = true;
1553         mode_scanlist[card_index].clear();
1554         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1555                 mode_scanlist[card_index].push_back(mode.first);
1556         }
1557         assert(!mode_scanlist[card_index].empty());
1558         mode_scanlist_index[card_index] = 0;
1559         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1560         last_mode_scan_change[card_index] = steady_clock::now();
1561 }
1562
1563 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1564 {
1565         assert(desired_output_card_index != -1);
1566         unique_lock<mutex> lock(card_mutex);
1567         return cards[desired_output_card_index].output->get_available_video_modes();
1568 }
1569
1570 Mixer::OutputChannel::~OutputChannel()
1571 {
1572         if (has_current_frame) {
1573                 parent->release_display_frame(&current_frame);
1574         }
1575         if (has_ready_frame) {
1576                 parent->release_display_frame(&ready_frame);
1577         }
1578 }
1579
1580 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1581 {
1582         // Store this frame for display. Remove the ready frame if any
1583         // (it was seemingly never used).
1584         {
1585                 unique_lock<mutex> lock(frame_mutex);
1586                 if (has_ready_frame) {
1587                         parent->release_display_frame(&ready_frame);
1588                 }
1589                 ready_frame = move(frame);
1590                 has_ready_frame = true;
1591
1592                 // Call the callbacks under the mutex (they should be short),
1593                 // so that we don't race against a callback removal.
1594                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1595                         key_and_callback.second();
1596                 }
1597         }
1598
1599         // Reduce the number of callbacks by filtering duplicates. The reason
1600         // why we bother doing this is that Qt seemingly can get into a state
1601         // where its builds up an essentially unbounded queue of signals,
1602         // consuming more and more memory, and there's no good way of collapsing
1603         // user-defined signals or limiting the length of the queue.
1604         if (transition_names_updated_callback) {
1605                 vector<string> transition_names = global_mixer->get_transition_names();
1606                 bool changed = false;
1607                 if (transition_names.size() != last_transition_names.size()) {
1608                         changed = true;
1609                 } else {
1610                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1611                                 if (transition_names[i] != last_transition_names[i]) {
1612                                         changed = true;
1613                                         break;
1614                                 }
1615                         }
1616                 }
1617                 if (changed) {
1618                         transition_names_updated_callback(transition_names);
1619                         last_transition_names = transition_names;
1620                 }
1621         }
1622         if (name_updated_callback) {
1623                 string name = global_mixer->get_channel_name(channel);
1624                 if (name != last_name) {
1625                         name_updated_callback(name);
1626                         last_name = name;
1627                 }
1628         }
1629         if (color_updated_callback) {
1630                 string color = global_mixer->get_channel_color(channel);
1631                 if (color != last_color) {
1632                         color_updated_callback(color);
1633                         last_color = color;
1634                 }
1635         }
1636 }
1637
1638 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1639 {
1640         unique_lock<mutex> lock(frame_mutex);
1641         if (!has_current_frame && !has_ready_frame) {
1642                 return false;
1643         }
1644
1645         if (has_current_frame && has_ready_frame) {
1646                 // We have a new ready frame. Toss the current one.
1647                 parent->release_display_frame(&current_frame);
1648                 has_current_frame = false;
1649         }
1650         if (has_ready_frame) {
1651                 assert(!has_current_frame);
1652                 current_frame = move(ready_frame);
1653                 ready_frame.ready_fence.reset();  // Drop the refcount.
1654                 ready_frame.input_frames.clear();  // Drop the refcounts.
1655                 has_current_frame = true;
1656                 has_ready_frame = false;
1657         }
1658
1659         *frame = current_frame;
1660         return true;
1661 }
1662
1663 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1664 {
1665         unique_lock<mutex> lock(frame_mutex);
1666         new_frame_ready_callbacks[key] = callback;
1667 }
1668
1669 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1670 {
1671         unique_lock<mutex> lock(frame_mutex);
1672         new_frame_ready_callbacks.erase(key);
1673 }
1674
1675 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1676 {
1677         transition_names_updated_callback = callback;
1678 }
1679
1680 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1681 {
1682         name_updated_callback = callback;
1683 }
1684
1685 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1686 {
1687         color_updated_callback = callback;
1688 }
1689
1690 mutex RefCountedGLsync::fence_lock;