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->is_cef_capture = (card_type == CardType::CEF_INPUT);
 527         card->may_have_dropped_last_frame = false;
 528         card->type = card_type;
 529         if (card->output.get() != output) {
 530                 card->output.reset(output);
 531         }
 532
 533         PixelFormat pixel_format;
 534         if (card_type == CardType::FFMPEG_INPUT) {
 535                 pixel_format = capture->get_current_pixel_format();
 536         } else if (card_type == CardType::CEF_INPUT) {
 537                 pixel_format = PixelFormat_8BitBGRA;
 538         } else if (global_flags.ten_bit_input) {
 539                 pixel_format = PixelFormat_10BitYCbCr;
 540         } else {
 541                 pixel_format = PixelFormat_8BitYCbCr;
 542         }
 543
 544         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 545         if (card->frame_allocator == nullptr) {
 546                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 547         }
 548         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 549         if (card->surface == nullptr) {
 550                 card->surface = create_surface_with_same_format(mixer_surface);
 551         }
 552         while (!card->new_frames.empty()) card->new_frames.pop_front();
 553         card->last_timecode = -1;
 554         card->capture->set_pixel_format(pixel_format);
 555         card->capture->configure_card();
 556
 557         // NOTE: start_bm_capture() happens in thread_func().
 558
 559         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 560         audio_mixer.reset_resampler(device);
 561         audio_mixer.set_display_name(device, card->capture->get_description());
 562         audio_mixer.trigger_state_changed_callback();
 563
 564         // Unregister old metrics, if any.
 565         if (!card->labels.empty()) {
 566                 const vector<pair<string, string>> &labels = card->labels;
 567                 card->jitter_history.unregister_metrics(labels);
 568                 card->queue_length_policy.unregister_metrics(labels);
 569                 global_metrics.remove("input_received_frames", labels);
 570                 global_metrics.remove("input_dropped_frames_jitter", labels);
 571                 global_metrics.remove("input_dropped_frames_error", labels);
 572                 global_metrics.remove("input_dropped_frames_resets", labels);
 573                 global_metrics.remove("input_queue_length_frames", labels);
 574                 global_metrics.remove("input_queue_duped_frames", labels);
 575
 576                 global_metrics.remove("input_has_signal_bool", labels);
 577                 global_metrics.remove("input_is_connected_bool", labels);
 578                 global_metrics.remove("input_interlaced_bool", labels);
 579                 global_metrics.remove("input_width_pixels", labels);
 580                 global_metrics.remove("input_height_pixels", labels);
 581                 global_metrics.remove("input_frame_rate_nom", labels);
 582                 global_metrics.remove("input_frame_rate_den", labels);
 583                 global_metrics.remove("input_sample_rate_hz", labels);
 584         }
 585
 586         // Register metrics.
 587         vector<pair<string, string>> labels;
 588         char card_name[64];
 589         snprintf(card_name, sizeof(card_name), "%d", card_index);
 590         labels.emplace_back("card", card_name);
 591
 592         switch (card_type) {
 593         case CardType::LIVE_CARD:
 594                 labels.emplace_back("cardtype", "live");
 595                 break;
 596         case CardType::FAKE_CAPTURE:
 597                 labels.emplace_back("cardtype", "fake");
 598                 break;
 599         case CardType::FFMPEG_INPUT:
 600                 labels.emplace_back("cardtype", "ffmpeg");
 601                 break;
 602         case CardType::CEF_INPUT:
 603                 labels.emplace_back("cardtype", "cef");
 604                 break;
 605         default:
 606                 assert(false);
 607         }
 608         card->jitter_history.register_metrics(labels);
 609         card->queue_length_policy.register_metrics(labels);
 610         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 611         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 612         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 613         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 614         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 615         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 616
 617         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 618         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 619         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 620         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 621         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 622         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 623         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 624         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 625         card->labels = labels;
 626 }
 627
 628 void Mixer::set_output_card_internal(int card_index)
 629 {
 630         // We don't really need to take card_mutex, since we're in the mixer
 631         // thread and don't mess with any queues (which is the only thing that happens
 632         // from other threads), but it's probably the safest in the long run.
 633         unique_lock<mutex> lock(card_mutex);
 634         if (output_card_index != -1) {
 635                 // Switch the old card from output to input.
 636                 CaptureCard *old_card = &cards[output_card_index];
 637                 old_card->output->end_output();
 638
 639                 // Stop the fake card that we put into place.
 640                 // This needs to _not_ happen under the mutex, to avoid deadlock
 641                 // (delivering the last frame needs to take the mutex).
 642                 CaptureInterface *fake_capture = old_card->capture.get();
 643                 lock.unlock();
 644                 fake_capture->stop_dequeue_thread();
 645                 lock.lock();
 646                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 647                 old_card->is_fake_capture = false;
 648                 old_card->capture->start_bm_capture();
 649         }
 650         if (card_index != -1) {
 651                 CaptureCard *card = &cards[card_index];
 652                 CaptureInterface *capture = card->capture.get();
 653                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 654                 // several seconds to complete (blocking on DisableVideoInput);
 655                 // see if we can maybe do it asynchronously.
 656                 lock.unlock();
 657                 capture->stop_dequeue_thread();
 658                 lock.lock();
 659                 card->parked_capture = move(card->capture);
 660                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 661                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 662                 card->queue_length_policy.reset(card_index);
 663                 card->capture->start_bm_capture();
 664                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 665                 card->output->start_output(desired_output_video_mode, pts_int);
 666         }
 667         output_card_index = card_index;
 668         output_jitter_history.clear();
 669 }
 670
 671 namespace {
 672
 673 int unwrap_timecode(uint16_t current_wrapped, int last)
 674 {
 675         uint16_t last_wrapped = last & 0xffff;
 676         if (current_wrapped > last_wrapped) {
 677                 return (last & ~0xffff) | current_wrapped;
 678         } else {
 679                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 680         }
 681 }
 682
 683 }  // namespace
 684
 685 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 686                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 687                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 688 {
 689         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 690         CaptureCard *card = &cards[card_index];
 691
 692         ++card->metric_input_received_frames;
 693         card->metric_input_has_signal_bool = video_format.has_signal;
 694         card->metric_input_is_connected_bool = video_format.is_connected;
 695         card->metric_input_interlaced_bool = video_format.interlaced;
 696         card->metric_input_width_pixels = video_format.width;
 697         card->metric_input_height_pixels = video_format.height;
 698         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 699         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 700         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 701
 702         if (is_mode_scanning[card_index]) {
 703                 if (video_format.has_signal) {
 704                         // Found a stable signal, so stop scanning.
 705                         is_mode_scanning[card_index] = false;
 706                 } else {
 707                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 708                         steady_clock::time_point now = steady_clock::now();
 709                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 710                         if (sec_since_last_switch > switch_time_s) {
 711                                 // It isn't this mode; try the next one.
 712                                 mode_scanlist_index[card_index]++;
 713                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 714                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 715                                 last_mode_scan_change[card_index] = now;
 716                         }
 717                 }
 718         }
 719
 720         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 721         assert(frame_length > 0);
 722
 723         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;
 724         if (num_samples > OUTPUT_FREQUENCY / 10) {
 725                 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",
 726                         card_index, int(audio_frame.len), int(audio_offset),
 727                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 728                 if (video_frame.owner) {
 729                         video_frame.owner->release_frame(video_frame);
 730                 }
 731                 if (audio_frame.owner) {
 732                         audio_frame.owner->release_frame(audio_frame);
 733                 }
 734                 return;
 735         }
 736
 737         int dropped_frames = 0;
 738         if (card->last_timecode != -1) {
 739                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 740         }
 741
 742         // Number of samples per frame if we need to insert silence.
 743         // (Could be nonintegral, but resampling will save us then.)
 744         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 745
 746         if (dropped_frames > MAX_FPS * 2) {
 747                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 748                         card_index, card->last_timecode, timecode);
 749                 audio_mixer.reset_resampler(device);
 750                 dropped_frames = 0;
 751                 ++card->metric_input_resets;
 752         } else if (dropped_frames > 0) {
 753                 // Insert silence as needed.
 754                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 755                         card_index, dropped_frames, timecode);
 756                 card->metric_input_dropped_frames_error += dropped_frames;
 757
 758                 bool success;
 759                 do {
 760                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 761                 } while (!success);
 762         }
 763
 764         if (num_samples > 0) {
 765                 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 766         }
 767
 768         // Done with the audio, so release it.
 769         if (audio_frame.owner) {
 770                 audio_frame.owner->release_frame(audio_frame);
 771         }
 772
 773         card->last_timecode = timecode;
 774
 775         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 776
 777         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 778         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 779         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 780                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 781                 assert(card->type == CardType::FFMPEG_INPUT);
 782                 assert(video_offset == 0);
 783                 expected_length = video_frame.len;
 784
 785                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 786                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 787                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 788                 cbcr_offset = video_format.width * video_format.height;
 789                 y_offset = 0;
 790         } else {
 791                 // All the other Y'CbCr formats are 4:2:2.
 792                 cbcr_width = video_format.width / 2;
 793                 cbcr_height = video_format.height;
 794                 cbcr_offset = video_offset / 2;
 795                 y_offset = video_frame.size / 2 + video_offset / 2;
 796         }
 797         if (video_frame.len - video_offset == 0 ||
 798             video_frame.len - video_offset != expected_length) {
 799                 if (video_frame.len != 0) {
 800                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 801                                 card_index, video_frame.len - video_offset, expected_length);
 802                 }
 803                 if (video_frame.owner) {
 804                         video_frame.owner->release_frame(video_frame);
 805                 }
 806
 807                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 808                 // so that pts can go up accordingly.
 809                 {
 810                         unique_lock<mutex> lock(card_mutex);
 811                         CaptureCard::NewFrame new_frame;
 812                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 813                         new_frame.length = frame_length;
 814                         new_frame.interlaced = false;
 815                         new_frame.dropped_frames = dropped_frames;
 816                         new_frame.received_timestamp = video_frame.received_timestamp;
 817                         card->new_frames.push_back(move(new_frame));
 818                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 819                 }
 820                 card->new_frames_changed.notify_all();
 821                 return;
 822         }
 823
 824         unsigned num_fields = video_format.interlaced ? 2 : 1;
 825         steady_clock::time_point frame_upload_start;
 826         bool interlaced_stride = false;
 827         if (video_format.interlaced) {
 828                 // Send the two fields along as separate frames; the other side will need to add
 829                 // a deinterlacer to actually get this right.
 830                 assert(video_format.height % 2 == 0);
 831                 video_format.height /= 2;
 832                 cbcr_height /= 2;
 833                 assert(frame_length % 2 == 0);
 834                 frame_length /= 2;
 835                 num_fields = 2;
 836                 if (video_format.second_field_start == 1) {
 837                         interlaced_stride = true;
 838                 }
 839                 frame_upload_start = steady_clock::now();
 840         }
 841         userdata->last_interlaced = video_format.interlaced;
 842         userdata->last_has_signal = video_format.has_signal;
 843         userdata->last_is_connected = video_format.is_connected;
 844         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 845         userdata->last_frame_rate_den = video_format.frame_rate_den;
 846         RefCountedFrame frame(video_frame);
 847
 848         // Upload the textures.
 849         for (unsigned field = 0; field < num_fields; ++field) {
 850                 // Put the actual texture upload in a lambda that is executed in the main thread.
 851                 // It is entirely possible to do this in the same thread (and it might even be
 852                 // faster, depending on the GPU and driver), but it appears to be trickling
 853                 // driver bugs very easily.
 854                 //
 855                 // Note that this means we must hold on to the actual frame data in <userdata>
 856                 // until the upload command is run, but we hold on to <frame> much longer than that
 857                 // (in fact, all the way until we no longer use the texture in rendering).
 858                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 859                         unsigned field_start_line;
 860                         if (field == 1) {
 861                                 field_start_line = video_format.second_field_start;
 862                         } else {
 863                                 field_start_line = video_format.extra_lines_top;
 864                         }
 865
 866                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 867                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 868                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 869
 870                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 871                         check_error();
 872
 873                         switch (userdata->pixel_format) {
 874                         case PixelFormat_10BitYCbCr: {
 875                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 876                                 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);
 877                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 878                                 break;
 879                         }
 880                         case PixelFormat_8BitYCbCr: {
 881                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 882                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 883
 884                                 // Make up our own strides, since we are interleaving.
 885                                 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);
 886                                 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);
 887                                 break;
 888                         }
 889                         case PixelFormat_8BitYCbCrPlanar: {
 890                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 891                                 size_t field_y_start = y_offset;
 892                                 size_t field_cb_start = cbcr_offset;
 893                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 894
 895                                 // Make up our own strides, since we are interleaving.
 896                                 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);
 897                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 898                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 899                                 break;
 900                         }
 901                         case PixelFormat_8BitBGRA: {
 902                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 903                                 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);
 904                                 // These could be asked to deliver mipmaps at any time.
 905                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 906                                 check_error();
 907                                 glGenerateMipmap(GL_TEXTURE_2D);
 908                                 check_error();
 909                                 glBindTexture(GL_TEXTURE_2D, 0);
 910                                 check_error();
 911                                 break;
 912                         }
 913                         default:
 914                                 assert(false);
 915                         }
 916
 917                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 918                         check_error();
 919                 };
 920
 921                 if (field == 1) {
 922                         // Don't upload the second field as fast as we can; wait until
 923                         // the field time has approximately passed. (Otherwise, we could
 924                         // get timing jitter against the other sources, and possibly also
 925                         // against the video display, although the latter is not as critical.)
 926                         // This requires our system clock to be reasonably close to the
 927                         // video clock, but that's not an unreasonable assumption.
 928                         steady_clock::time_point second_field_start = frame_upload_start +
 929                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 930                         this_thread::sleep_until(second_field_start);
 931                 }
 932
 933                 {
 934                         unique_lock<mutex> lock(card_mutex);
 935                         CaptureCard::NewFrame new_frame;
 936                         new_frame.frame = frame;
 937                         new_frame.length = frame_length;
 938                         new_frame.field = field;
 939                         new_frame.interlaced = video_format.interlaced;
 940                         new_frame.upload_func = upload_func;
 941                         new_frame.dropped_frames = dropped_frames;
 942                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 943                         card->new_frames.push_back(move(new_frame));
 944                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 945                         card->may_have_dropped_last_frame = false;
 946                 }
 947                 card->new_frames_changed.notify_all();
 948         }
 949 }
 950
 951 void Mixer::bm_hotplug_add(libusb_device *dev)
 952 {
 953         lock_guard<mutex> lock(hotplug_mutex);
 954         hotplugged_cards.push_back(dev);
 955 }
 956
 957 void Mixer::bm_hotplug_remove(unsigned card_index)
 958 {
 959         cards[card_index].new_frames_changed.notify_all();
 960 }
 961
 962 void Mixer::thread_func()
 963 {
 964         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 965
 966         eglBindAPI(EGL_OPENGL_API);
 967         QOpenGLContext *context = create_context(mixer_surface);
 968         if (!make_current(context, mixer_surface)) {
 969                 printf("oops\n");
 970                 exit(1);
 971         }
 972
 973         // Start the actual capture. (We don't want to do it before we're actually ready
 974         // to process output frames.)
 975         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 976                 if (int(card_index) != output_card_index) {
 977                         cards[card_index].capture->start_bm_capture();
 978                 }
 979         }
 980
 981         BasicStats basic_stats(/*verbose=*/true);
 982         int stats_dropped_frames = 0;
 983
 984         while (!should_quit) {
 985                 if (desired_output_card_index != output_card_index) {
 986                         set_output_card_internal(desired_output_card_index);
 987                 }
 988                 if (output_card_index != -1 &&
 989                     desired_output_video_mode != output_video_mode) {
 990                         DeckLinkOutput *output = cards[output_card_index].output.get();
 991                         output->end_output();
 992                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 993                         output->start_output(desired_output_video_mode, pts_int);
 994                 }
 995
 996                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 997                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 998
 999                 bool master_card_is_output;
1000                 unsigned master_card_index;
1001                 if (output_card_index != -1) {
1002                         master_card_is_output = true;
1003                         master_card_index = output_card_index;
1004                 } else {
1005                         master_card_is_output = false;
1006                         master_card_index = theme->map_signal(master_clock_channel);
1007                         assert(master_card_index < num_cards);
1008                 }
1009
1010                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1011                 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);
1012                 stats_dropped_frames += output_frame_info.dropped_frames;
1013
1014                 handle_hotplugged_cards();
1015
1016                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1017                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1018                                 continue;
1019                         }
1020                         if (new_frames[card_index].frame->len == 0) {
1021                                 ++new_frames[card_index].dropped_frames;
1022                         }
1023                         if (new_frames[card_index].dropped_frames > 0) {
1024                                 printf("Card %u dropped %d frames before this\n",
1025                                         card_index, int(new_frames[card_index].dropped_frames));
1026                         }
1027                 }
1028
1029                 // If the first card is reporting a corrupted or otherwise dropped frame,
1030                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1031                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1032                         ++stats_dropped_frames;
1033                         pts_int += new_frames[master_card_index].length;
1034                         continue;
1035                 }
1036
1037                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1038                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1039                                 continue;
1040
1041                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1042                         assert(new_frame->frame != nullptr);
1043                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1044                         check_error();
1045
1046                         // The new texture might need uploading before use.
1047                         if (new_frame->upload_func) {
1048                                 new_frame->upload_func();
1049                                 new_frame->upload_func = nullptr;
1050                         }
1051                 }
1052
1053                 int64_t frame_duration = output_frame_info.frame_duration;
1054                 render_one_frame(frame_duration);
1055                 ++frame_num;
1056                 pts_int += frame_duration;
1057
1058                 basic_stats.update(frame_num, stats_dropped_frames);
1059                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1060
1061                 if (should_cut.exchange(false)) {  // Test and clear.
1062                         video_encoder->do_cut(frame_num);
1063                 }
1064
1065 #if 0
1066                 // Reset every 100 frames, so that local variations in frame times
1067                 // (especially for the first few frames, when the shaders are
1068                 // compiled etc.) don't make it hard to measure for the entire
1069                 // remaining duration of the program.
1070                 if (frame == 10000) {
1071                         frame = 0;
1072                         start = now;
1073                 }
1074 #endif
1075                 check_error();
1076         }
1077
1078         resource_pool->clean_context();
1079 }
1080
1081 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1082 {
1083         if (output_card_index != -1) {
1084                 // The output card (ie., cards[output_card_index].output) is the master clock,
1085                 // so no input card (ie., cards[card_index].capture) is.
1086                 return false;
1087         }
1088         return (card_index == master_card_index);
1089 }
1090
1091 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1092 {
1093         // Count the number of frames in the queue, including any frames
1094         // we dropped. It's hard to know exactly how we should deal with
1095         // dropped (corrupted) input frames; they don't help our goal of
1096         // avoiding starvation, but they still add to the problem of latency.
1097         // Since dropped frames is going to mean a bump in the signal anyway,
1098         // we err on the side of having more stable latency instead.
1099         unsigned queue_length = 0;
1100         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1101                 queue_length += frame.dropped_frames + 1;
1102         }
1103
1104         // If needed, drop frames until the queue is below the safe limit.
1105         // We prefer to drop from the head, because all else being equal,
1106         // we'd like more recent frames (less latency).
1107         unsigned dropped_frames = 0;
1108         while (queue_length > safe_queue_length) {
1109                 assert(!card->new_frames.empty());
1110                 assert(queue_length > card->new_frames.front().dropped_frames);
1111                 queue_length -= card->new_frames.front().dropped_frames;
1112
1113                 if (queue_length <= safe_queue_length) {
1114                         // No need to drop anything.
1115                         break;
1116                 }
1117
1118                 card->new_frames.pop_front();
1119                 card->new_frames_changed.notify_all();
1120                 --queue_length;
1121                 ++dropped_frames;
1122
1123                 if (queue_length == 0 && card->is_cef_capture) {
1124                         card->may_have_dropped_last_frame = true;
1125                 }
1126         }
1127
1128         card->metric_input_dropped_frames_jitter += dropped_frames;
1129         card->metric_input_queue_length_frames = queue_length;
1130
1131 #if 0
1132         if (dropped_frames > 0) {
1133                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1134                         card_index, dropped_frames);
1135         }
1136 #endif
1137 }
1138
1139 pair<string, string> Mixer::get_channels_json()
1140 {
1141         Channels ret;
1142         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1143                 Channel *channel = ret.add_channel();
1144                 channel->set_index(channel_idx);
1145                 channel->set_name(theme->get_channel_name(channel_idx));
1146                 channel->set_color(theme->get_channel_color(channel_idx));
1147         }
1148         string contents;
1149         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1150         return make_pair(contents, "text/json");
1151 }
1152
1153 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1154 {
1155         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1156 }
1157
1158 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])
1159 {
1160         OutputFrameInfo output_frame_info;
1161 start:
1162         unique_lock<mutex> lock(card_mutex, defer_lock);
1163         if (master_card_is_output) {
1164                 // Clocked to the output, so wait for it to be ready for the next frame.
1165                 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);
1166                 lock.lock();
1167         } else {
1168                 // Wait for the master card to have a new frame.
1169                 // TODO: Add a timeout.
1170                 output_frame_info.is_preroll = false;
1171                 lock.lock();
1172                 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(); });
1173         }
1174
1175         if (master_card_is_output) {
1176                 handle_hotplugged_cards();
1177         } else if (cards[master_card_index].new_frames.empty()) {
1178                 // We were woken up, but not due to a new frame. Deal with it
1179                 // and then restart.
1180                 assert(cards[master_card_index].capture->get_disconnected());
1181                 handle_hotplugged_cards();
1182                 lock.unlock();
1183                 goto start;
1184         }
1185
1186         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1187                 CaptureCard *card = &cards[card_index];
1188                 if (card->new_frames.empty()) {  // Starvation.
1189                         ++card->metric_input_duped_frames;
1190                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1191                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1192                                 // stream of frames, so we'll have to ask it to repaint the frame
1193                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1194                                 // trim the queue completely away, and cleared when we actually
1195                                 // get a new frame.)
1196                                 ((CEFCapture *)card->capture.get())->request_new_frame();
1197                         }
1198                 } else {
1199                         new_frames[card_index] = move(card->new_frames.front());
1200                         has_new_frame[card_index] = true;
1201                         card->new_frames.pop_front();
1202                         card->new_frames_changed.notify_all();
1203                 }
1204         }
1205
1206         if (!master_card_is_output) {
1207                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1208                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1209                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1210         }
1211
1212         if (!output_frame_info.is_preroll) {
1213                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1214         }
1215
1216         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1217                 CaptureCard *card = &cards[card_index];
1218                 if (has_new_frame[card_index] &&
1219                     !input_card_is_master_clock(card_index, master_card_index) &&
1220                     !output_frame_info.is_preroll) {
1221                         card->queue_length_policy.update_policy(
1222                                 output_frame_info.frame_timestamp,
1223                                 card->jitter_history.get_expected_next_frame(),
1224                                 new_frames[master_card_index].length,
1225                                 output_frame_info.frame_duration,
1226                                 card->jitter_history.estimate_max_jitter(),
1227                                 output_jitter_history.estimate_max_jitter());
1228                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1229                                                   card->queue_length_policy.get_safe_queue_length()));
1230                 }
1231         }
1232
1233         // This might get off by a fractional sample when changing master card
1234         // between ones with different frame rates, but that's fine.
1235         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1236         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1237         fractional_samples = num_samples_times_timebase % TIMEBASE;
1238         assert(output_frame_info.num_samples >= 0);
1239
1240         return output_frame_info;
1241 }
1242
1243 void Mixer::handle_hotplugged_cards()
1244 {
1245         // Check for cards that have been disconnected since last frame.
1246         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1247                 CaptureCard *card = &cards[card_index];
1248                 if (card->capture->get_disconnected()) {
1249                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1250                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1251                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1252                         card->queue_length_policy.reset(card_index);
1253                         card->capture->start_bm_capture();
1254                 }
1255         }
1256
1257         // Check for cards that have been connected since last frame.
1258         vector<libusb_device *> hotplugged_cards_copy;
1259         {
1260                 lock_guard<mutex> lock(hotplug_mutex);
1261                 swap(hotplugged_cards, hotplugged_cards_copy);
1262         }
1263         for (libusb_device *new_dev : hotplugged_cards_copy) {
1264                 // Look for a fake capture card where we can stick this in.
1265                 int free_card_index = -1;
1266                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1267                         if (cards[card_index].is_fake_capture) {
1268                                 free_card_index = card_index;
1269                                 break;
1270                         }
1271                 }
1272
1273                 if (free_card_index == -1) {
1274                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1275                         libusb_unref_device(new_dev);
1276                 } else {
1277                         // BMUSBCapture takes ownership.
1278                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1279                         CaptureCard *card = &cards[free_card_index];
1280                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1281                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1282                         card->queue_length_policy.reset(free_card_index);
1283                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1284                         capture->start_bm_capture();
1285                 }
1286         }
1287 }
1288
1289
1290 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)
1291 {
1292         // Resample the audio as needed, including from previously dropped frames.
1293         assert(num_cards > 0);
1294         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1295                 const bool dropped_frame = (frame_num != dropped_frames);
1296                 {
1297                         // Signal to the audio thread to process this frame.
1298                         // Note that if the frame is a dropped frame, we signal that
1299                         // we don't want to use this frame as base for adjusting
1300                         // the resampler rate. The reason for this is that the timing
1301                         // of these frames is often way too late; they typically don't
1302                         // “arrive” before we synthesize them. Thus, we could end up
1303                         // in a situation where we have inserted e.g. five audio frames
1304                         // into the queue before we then start pulling five of them
1305                         // back out. This makes ResamplingQueue overestimate the delay,
1306                         // causing undue resampler changes. (We _do_ use the last,
1307                         // non-dropped frame; perhaps we should just discard that as well,
1308                         // since dropped frames are expected to be rare, and it might be
1309                         // better to just wait until we have a slightly more normal situation).
1310                         unique_lock<mutex> lock(audio_mutex);
1311                         bool adjust_rate = !dropped_frame && !is_preroll;
1312                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1313                         audio_task_queue_changed.notify_one();
1314                 }
1315                 if (dropped_frame) {
1316                         // For dropped frames, increase the pts. Note that if the format changed
1317                         // in the meantime, we have no way of detecting that; we just have to
1318                         // assume the frame length is always the same.
1319                         pts_int += length_per_frame;
1320                 }
1321         }
1322 }
1323
1324 void Mixer::render_one_frame(int64_t duration)
1325 {
1326         // Determine the time code for this frame before we start rendering.
1327         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1328         if (display_timecode_on_stdout) {
1329                 printf("Timecode: '%s'\n", timecode_text.c_str());
1330         }
1331
1332         // Update Y'CbCr settings for all cards.
1333         {
1334                 unique_lock<mutex> lock(card_mutex);
1335                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1336                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1337                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1338                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1339                         input_state.full_range[card_index] = interpretation->full_range;
1340                 }
1341         }
1342
1343         // Get the main chain from the theme, and set its state immediately.
1344         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1345         EffectChain *chain = theme_main_chain.chain;
1346         theme_main_chain.setup_chain();
1347         //theme_main_chain.chain->enable_phase_timing(true);
1348
1349         // The theme can't (or at least shouldn't!) call connect_signal() on
1350         // each FFmpeg or CEF input, so we'll do it here.
1351         for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_video_signal_connections()) {
1352                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1353         }
1354 #ifdef HAVE_CEF
1355         for (const pair<LiveInputWrapper *, CEFCapture *> &conn : theme->get_html_signal_connections()) {
1356                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1357         }
1358 #endif
1359
1360         // If HDMI/SDI output is active and the user has requested auto mode,
1361         // its mode overrides the existing Y'CbCr setting for the chain.
1362         YCbCrLumaCoefficients ycbcr_output_coefficients;
1363         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1364                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1365         } else {
1366                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1367         }
1368
1369         // TODO: Reduce the duplication against theme.cpp.
1370         YCbCrFormat output_ycbcr_format;
1371         output_ycbcr_format.chroma_subsampling_x = 1;
1372         output_ycbcr_format.chroma_subsampling_y = 1;
1373         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1374         output_ycbcr_format.full_range = false;
1375         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1376         chain->change_ycbcr_output_format(output_ycbcr_format);
1377
1378         // Render main chain. If we're using zerocopy Quick Sync encoding
1379         // (the default case), we take an extra copy of the created outputs,
1380         // so that we can display it back to the screen later (it's less memory
1381         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1382         // Ideally, we'd like to avoid taking copies and just use the main textures
1383         // for display as well, but they're just views into VA-API memory and must be
1384         // unmapped during encoding, so we can't use them for display, unfortunately.
1385         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1386         GLuint y_copy_tex, cbcr_copy_tex = 0;
1387         GLuint y_display_tex, cbcr_display_tex;
1388         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1389         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1390         const bool is_zerocopy = video_encoder->is_zerocopy();
1391         if (is_zerocopy) {
1392                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1393                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1394                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1395
1396                 y_display_tex = y_copy_tex;
1397                 cbcr_display_tex = cbcr_copy_tex;
1398
1399                 // y_tex and cbcr_tex will be given by VideoEncoder.
1400         } else {
1401                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1402                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1403                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1404
1405                 y_display_tex = y_tex;
1406                 cbcr_display_tex = cbcr_tex;
1407         }
1408
1409         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1410         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1411         assert(got_frame);
1412
1413         GLuint fbo;
1414         if (is_zerocopy) {
1415                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1416         } else {
1417                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1418         }
1419         check_error();
1420         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1421
1422         if (display_timecode_in_stream) {
1423                 // Render the timecode on top.
1424                 timecode_renderer->render_timecode(fbo, timecode_text);
1425         }
1426
1427         resource_pool->release_fbo(fbo);
1428
1429         if (is_zerocopy) {
1430                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1431         } else {
1432                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1433         }
1434         if (output_card_index != -1) {
1435                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1436         }
1437         resource_pool->release_2d_texture(cbcr_full_tex);
1438
1439         // Set the right state for the Y' and CbCr textures we use for display.
1440         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1441         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1442         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1443         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1444         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1445
1446         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1447         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1448         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1449         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1450
1451         RefCountedGLsync fence = video_encoder->end_frame();
1452
1453         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1454         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1455         DisplayFrame live_frame;
1456         live_frame.chain = display_chain.get();
1457         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1458                 display_input->set_texture_num(0, y_display_tex);
1459                 display_input->set_texture_num(1, cbcr_display_tex);
1460         };
1461         live_frame.ready_fence = fence;
1462         live_frame.input_frames = {};
1463         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1464         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1465
1466         // Set up preview and any additional channels.
1467         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1468                 DisplayFrame display_frame;
1469                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1470                 display_frame.chain = move(chain.chain);
1471                 display_frame.setup_chain = move(chain.setup_chain);
1472                 display_frame.ready_fence = fence;
1473                 display_frame.input_frames = move(chain.input_frames);
1474                 display_frame.temp_textures = {};
1475                 output_channel[i].output_frame(move(display_frame));
1476         }
1477 }
1478
1479 void Mixer::audio_thread_func()
1480 {
1481         pthread_setname_np(pthread_self(), "Mixer_Audio");
1482
1483         while (!should_quit) {
1484                 AudioTask task;
1485
1486                 {
1487                         unique_lock<mutex> lock(audio_mutex);
1488                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1489                         if (should_quit) {
1490                                 return;
1491                         }
1492                         task = audio_task_queue.front();
1493                         audio_task_queue.pop();
1494                 }
1495
1496                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1497                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1498                 vector<float> samples_out = audio_mixer.get_output(
1499                         task.frame_timestamp,
1500                         task.num_samples,
1501                         rate_adjustment_policy);
1502
1503                 // Send the samples to the sound card, then add them to the output.
1504                 if (alsa) {
1505                         alsa->write(samples_out);
1506                 }
1507                 if (output_card_index != -1) {
1508                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1509                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1510                 }
1511                 video_encoder->add_audio(task.pts_int, move(samples_out));
1512         }
1513 }
1514
1515 void Mixer::release_display_frame(DisplayFrame *frame)
1516 {
1517         for (GLuint texnum : frame->temp_textures) {
1518                 resource_pool->release_2d_texture(texnum);
1519         }
1520         frame->temp_textures.clear();
1521         frame->ready_fence.reset();
1522         frame->input_frames.clear();
1523 }
1524
1525 void Mixer::start()
1526 {
1527         mixer_thread = thread(&Mixer::thread_func, this);
1528         audio_thread = thread(&Mixer::audio_thread_func, this);
1529 }
1530
1531 void Mixer::quit()
1532 {
1533         should_quit = true;
1534         audio_task_queue_changed.notify_one();
1535         mixer_thread.join();
1536         audio_thread.join();
1537 }
1538
1539 void Mixer::transition_clicked(int transition_num)
1540 {
1541         theme->transition_clicked(transition_num, pts());
1542 }
1543
1544 void Mixer::channel_clicked(int preview_num)
1545 {
1546         theme->channel_clicked(preview_num);
1547 }
1548
1549 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1550 {
1551         unique_lock<mutex> lock(card_mutex);
1552         return ycbcr_interpretation[card_index];
1553 }
1554
1555 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1556 {
1557         unique_lock<mutex> lock(card_mutex);
1558         ycbcr_interpretation[card_index] = interpretation;
1559 }
1560
1561 void Mixer::start_mode_scanning(unsigned card_index)
1562 {
1563         assert(card_index < num_cards);
1564         if (is_mode_scanning[card_index]) {
1565                 return;
1566         }
1567         is_mode_scanning[card_index] = true;
1568         mode_scanlist[card_index].clear();
1569         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1570                 mode_scanlist[card_index].push_back(mode.first);
1571         }
1572         assert(!mode_scanlist[card_index].empty());
1573         mode_scanlist_index[card_index] = 0;
1574         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1575         last_mode_scan_change[card_index] = steady_clock::now();
1576 }
1577
1578 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1579 {
1580         assert(desired_output_card_index != -1);
1581         unique_lock<mutex> lock(card_mutex);
1582         return cards[desired_output_card_index].output->get_available_video_modes();
1583 }
1584
1585 Mixer::OutputChannel::~OutputChannel()
1586 {
1587         if (has_current_frame) {
1588                 parent->release_display_frame(&current_frame);
1589         }
1590         if (has_ready_frame) {
1591                 parent->release_display_frame(&ready_frame);
1592         }
1593 }
1594
1595 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1596 {
1597         // Store this frame for display. Remove the ready frame if any
1598         // (it was seemingly never used).
1599         {
1600                 unique_lock<mutex> lock(frame_mutex);
1601                 if (has_ready_frame) {
1602                         parent->release_display_frame(&ready_frame);
1603                 }
1604                 ready_frame = move(frame);
1605                 has_ready_frame = true;
1606
1607                 // Call the callbacks under the mutex (they should be short),
1608                 // so that we don't race against a callback removal.
1609                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1610                         key_and_callback.second();
1611                 }
1612         }
1613
1614         // Reduce the number of callbacks by filtering duplicates. The reason
1615         // why we bother doing this is that Qt seemingly can get into a state
1616         // where its builds up an essentially unbounded queue of signals,
1617         // consuming more and more memory, and there's no good way of collapsing
1618         // user-defined signals or limiting the length of the queue.
1619         if (transition_names_updated_callback) {
1620                 vector<string> transition_names = global_mixer->get_transition_names();
1621                 bool changed = false;
1622                 if (transition_names.size() != last_transition_names.size()) {
1623                         changed = true;
1624                 } else {
1625                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1626                                 if (transition_names[i] != last_transition_names[i]) {
1627                                         changed = true;
1628                                         break;
1629                                 }
1630                         }
1631                 }
1632                 if (changed) {
1633                         transition_names_updated_callback(transition_names);
1634                         last_transition_names = transition_names;
1635                 }
1636         }
1637         if (name_updated_callback) {
1638                 string name = global_mixer->get_channel_name(channel);
1639                 if (name != last_name) {
1640                         name_updated_callback(name);
1641                         last_name = name;
1642                 }
1643         }
1644         if (color_updated_callback) {
1645                 string color = global_mixer->get_channel_color(channel);
1646                 if (color != last_color) {
1647                         color_updated_callback(color);
1648                         last_color = color;
1649                 }
1650         }
1651 }
1652
1653 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1654 {
1655         unique_lock<mutex> lock(frame_mutex);
1656         if (!has_current_frame && !has_ready_frame) {
1657                 return false;
1658         }
1659
1660         if (has_current_frame && has_ready_frame) {
1661                 // We have a new ready frame. Toss the current one.
1662                 parent->release_display_frame(&current_frame);
1663                 has_current_frame = false;
1664         }
1665         if (has_ready_frame) {
1666                 assert(!has_current_frame);
1667                 current_frame = move(ready_frame);
1668                 ready_frame.ready_fence.reset();  // Drop the refcount.
1669                 ready_frame.input_frames.clear();  // Drop the refcounts.
1670                 has_current_frame = true;
1671                 has_ready_frame = false;
1672         }
1673
1674         *frame = current_frame;
1675         return true;
1676 }
1677
1678 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1679 {
1680         unique_lock<mutex> lock(frame_mutex);
1681         new_frame_ready_callbacks[key] = callback;
1682 }
1683
1684 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1685 {
1686         unique_lock<mutex> lock(frame_mutex);
1687         new_frame_ready_callbacks.erase(key);
1688 }
1689
1690 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1691 {
1692         transition_names_updated_callback = callback;
1693 }
1694
1695 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1696 {
1697         name_updated_callback = callback;
1698 }
1699
1700 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1701 {
1702         color_updated_callback = callback;
1703 }
1704
1705 mutex RefCountedGLsync::fence_lock;