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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect_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 "shared/context.h"
  41 #include "decklink_capture.h"
  42 #include "decklink_output.h"
  43 #include "defs.h"
  44 #include "shared/disk_space_estimator.h"
  45 #include "ffmpeg_capture.h"
  46 #include "flags.h"
  47 #include "input_mapping.h"
  48 #include "shared/metrics.h"
  49 #include "mjpeg_encoder.h"
  50 #include "pbo_frame_allocator.h"
  51 #include "shared/ref_counted_gl_sync.h"
  52 #include "resampling_queue.h"
  53 #include "shared/timebase.h"
  54 #include "timecode_renderer.h"
  55 #include "v210_converter.h"
  56 #include "va_display_with_cleanup.h"
  57 #include "video_encoder.h"
  58
  59 #undef Status
  60 #include <google/protobuf/util/json_util.h>
  61 #include "json.pb.h"
  62
  63 class IDeckLink;
  64 class QOpenGLContext;
  65
  66 using namespace movit;
  67 using namespace std;
  68 using namespace std::chrono;
  69 using namespace std::placeholders;
  70 using namespace bmusb;
  71
  72 Mixer *global_mixer = nullptr;
  73
  74 namespace {
  75
  76 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  77 {
  78         if (interlaced) {
  79                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  80                         input_state->buffered_frames[card_index][frame_num] =
  81                                 input_state->buffered_frames[card_index][frame_num - 1];
  82                 }
  83                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  84         } else {
  85                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  86                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  87                 }
  88         }
  89 }
  90
  91 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
  92 {
  93         bool first;
  94         switch (userdata->pixel_format) {
  95         case PixelFormat_10BitYCbCr:
  96                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  97                 break;
  98         case PixelFormat_8BitYCbCr:
  99                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
 100                 break;
 101         case PixelFormat_8BitBGRA:
 102                 first = userdata->tex_rgba[field] == 0;
 103                 break;
 104         case PixelFormat_8BitYCbCrPlanar:
 105                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 106                 break;
 107         default:
 108                 assert(false);
 109         }
 110
 111         if (first ||
 112             width != userdata->last_width[field] ||
 113             height != userdata->last_height[field] ||
 114             cbcr_width != userdata->last_cbcr_width[field] ||
 115             cbcr_height != userdata->last_cbcr_height[field]) {
 116                 // We changed resolution since last use of this texture, so we need to create
 117                 // a new object. Note that this each card has its own PBOFrameAllocator,
 118                 // we don't need to worry about these flip-flopping between resolutions.
 119                 switch (userdata->pixel_format) {
 120                 case PixelFormat_10BitYCbCr:
 121                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 122                         check_error();
 123                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 124                         check_error();
 125                         break;
 126                 case PixelFormat_8BitYCbCr: {
 127                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 128                         check_error();
 129                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 130                         check_error();
 131                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 132                         check_error();
 133                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 134                         check_error();
 135                         break;
 136                 }
 137                 case PixelFormat_8BitYCbCrPlanar: {
 138                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 139                         check_error();
 140                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 141                         check_error();
 142                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 143                         check_error();
 144                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 145                         check_error();
 146                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 147                         check_error();
 148                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 149                         check_error();
 150                         break;
 151                 }
 152                 case PixelFormat_8BitBGRA:
 153                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 154                         check_error();
 155                         if (global_flags.can_disable_srgb_decoder) {  // See the comments in tweaked_inputs.h.
 156                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 157                         } else {
 158                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 159                         }
 160                         check_error();
 161                         break;
 162                 default:
 163                         assert(false);
 164                 }
 165                 userdata->last_width[field] = width;
 166                 userdata->last_height[field] = height;
 167                 userdata->last_cbcr_width[field] = cbcr_width;
 168                 userdata->last_cbcr_height[field] = cbcr_height;
 169         }
 170         if (global_flags.ten_bit_input &&
 171             (first || v210_width != userdata->last_v210_width[field])) {
 172                 // Same as above; we need to recreate the texture.
 173                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 174                 check_error();
 175                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 176                 check_error();
 177                 userdata->last_v210_width[field] = v210_width;
 178         }
 179 }
 180
 181 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 182 {
 183         if (interlaced_stride) {
 184                 stride *= 2;
 185         }
 186         if (global_flags.flush_pbos) {
 187                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 188                 check_error();
 189         }
 190
 191         glBindTexture(GL_TEXTURE_2D, tex);
 192         check_error();
 193         if (interlaced_stride) {
 194                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 195                 check_error();
 196         } else {
 197                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 198                 check_error();
 199         }
 200
 201         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 202         check_error();
 203         glBindTexture(GL_TEXTURE_2D, 0);
 204         check_error();
 205         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 206         check_error();
 207 }
 208
 209 }  // namespace
 210
 211 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 212 {
 213         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 214         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 215 }
 216
 217 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 218 {
 219         global_metrics.remove("input_underestimated_jitter_frames", labels);
 220         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 221 }
 222
 223 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 224 {
 225         if (expected_timestamp > steady_clock::time_point::min()) {
 226                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 227                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 228                 history.push_back(orders.insert(jitter_seconds));
 229                 if (jitter_seconds > estimate_max_jitter()) {
 230                         ++metric_input_underestimated_jitter_frames;
 231                 }
 232
 233                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 234
 235                 if (history.size() > history_length) {
 236                         orders.erase(history.front());
 237                         history.pop_front();
 238                 }
 239                 assert(history.size() <= history_length);
 240         }
 241         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 242 }
 243
 244 double JitterHistory::estimate_max_jitter() const
 245 {
 246         if (orders.empty()) {
 247                 return 0.0;
 248         }
 249         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 250         if (percentile <= 0.5) {
 251                 return *next(orders.begin(), elem_idx) * multiplier;
 252         } else {
 253                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 254         }
 255 }
 256
 257 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 258 {
 259         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 260 }
 261
 262 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 263 {
 264         global_metrics.remove("input_queue_safe_length_frames", labels);
 265 }
 266
 267 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 268                                       steady_clock::time_point expected_next_frame,
 269                                       int64_t input_frame_duration,
 270                                       int64_t master_frame_duration,
 271                                       double max_input_card_jitter_seconds,
 272                                       double max_master_card_jitter_seconds)
 273 {
 274         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 275         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 276
 277         // Figure out when we can expect the next frame for this card, assuming
 278         // worst-case jitter (ie., the frame is maximally late).
 279         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 280
 281         // How many times are the master card expected to tick in that time?
 282         // We assume the master clock has worst-case jitter but not any rate
 283         // discrepancy, ie., it ticks as early as possible every time, but not
 284         // cumulatively.
 285         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 286
 287         // As a special case, if the master card ticks faster than the input card,
 288         // we expect the queue to drain by itself even without dropping. But if
 289         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 290         // go slowly enough that the effect wouldn't really be appreciable.
 291         // We account for this by looking at the situation five frames ahead,
 292         // assuming everything else is the same.
 293         double frames_allowed;
 294         if (master_frame_duration < input_frame_duration) {
 295                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 296         } else {
 297                 frames_allowed = frames_needed;
 298         }
 299
 300         safe_queue_length = max<int>(floor(frames_allowed), 0);
 301         metric_input_queue_safe_length_frames = safe_queue_length;
 302 }
 303
 304 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 305         : httpd(),
 306           num_cards(num_cards),
 307           mixer_surface(create_surface(format)),
 308           h264_encoder_surface(create_surface(format)),
 309           decklink_output_surface(create_surface(format))
 310 {
 311         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 312         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 313         check_error();
 314
 315         // This nearly always should be true.
 316         global_flags.can_disable_srgb_decoder =
 317                 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
 318                 epoxy_has_gl_extension("GL_ARB_sampler_objects");
 319
 320         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 321         // will be halved when sampling them, and we need to compensate here.
 322         movit_texel_subpixel_precision /= 2.0;
 323
 324         resource_pool.reset(new ResourcePool);
 325         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 326                 output_channel[i].parent = this;
 327                 output_channel[i].channel = i;
 328         }
 329
 330         ImageFormat inout_format;
 331         inout_format.color_space = COLORSPACE_sRGB;
 332         inout_format.gamma_curve = GAMMA_sRGB;
 333
 334         // Matches the 4:2:0 format created by the main chain.
 335         YCbCrFormat ycbcr_format;
 336         ycbcr_format.chroma_subsampling_x = 2;
 337         ycbcr_format.chroma_subsampling_y = 2;
 338         if (global_flags.ycbcr_rec709_coefficients) {
 339                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 340         } else {
 341                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 342         }
 343         ycbcr_format.full_range = false;
 344         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 345         ycbcr_format.cb_x_position = 0.0f;
 346         ycbcr_format.cr_x_position = 0.0f;
 347         ycbcr_format.cb_y_position = 0.5f;
 348         ycbcr_format.cr_y_position = 0.5f;
 349
 350         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 351         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 352         check_error();
 353         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 354         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 355         display_chain->add_input(display_input);
 356         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 357         display_chain->set_dither_bits(0);  // Don't bother.
 358         display_chain->finalize();
 359
 360         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));
 361         mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 362
 363         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 364         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 365
 366         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 367         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 368         audio_mixer.reset(new AudioMixer(num_cards, video_inputs.size()));
 369
 370         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 371         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
 372                 char url[256];
 373                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
 374                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
 375         }
 376
 377         // Start listening for clients only once VideoEncoder has written its header, if any.
 378         httpd.start(global_flags.http_port);
 379
 380         // First try initializing the then PCI devices, then USB, then
 381         // fill up with fake cards until we have the desired number of cards.
 382         unsigned num_pci_devices = 0;
 383         unsigned card_index = 0;
 384
 385         {
 386                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 387                 if (decklink_iterator != nullptr) {
 388                         for ( ; card_index < num_cards; ++card_index) {
 389                                 IDeckLink *decklink;
 390                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 391                                         break;
 392                                 }
 393
 394                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 395                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 396                                 if (!output->set_device(decklink)) {
 397                                         delete output;
 398                                         output = nullptr;
 399                                 }
 400                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 401                                 ++num_pci_devices;
 402                         }
 403                         decklink_iterator->Release();
 404                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 405                 } else {
 406                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 407                 }
 408         }
 409
 410         unsigned num_usb_devices = BMUSBCapture::num_cards();
 411         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 412                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 413                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 414                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 415         }
 416         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 417
 418         unsigned num_fake_cards = 0;
 419         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 420                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 421                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 422         }
 423
 424         if (num_fake_cards > 0) {
 425                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 426         }
 427
 428         // Initialize all video inputs the theme asked for. Note that these are
 429         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 430         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 431                 if (card_index >= MAX_VIDEO_CARDS) {
 432                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 433                         exit(1);
 434                 }
 435                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 436                 video_inputs[video_card_index]->set_card_index(card_index);
 437         }
 438         num_video_inputs = video_inputs.size();
 439
 440 #ifdef HAVE_CEF
 441         // Same, for HTML inputs.
 442         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 443         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 444                 if (card_index >= MAX_VIDEO_CARDS) {
 445                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 446                         exit(1);
 447                 }
 448                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
 449                 html_inputs[html_card_index]->set_card_index(card_index);
 450         }
 451         num_html_inputs = html_inputs.size();
 452 #endif
 453
 454         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 455         BMUSBCapture::start_bm_thread();
 456
 457         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 458                 cards[card_index].queue_length_policy.reset(card_index);
 459         }
 460
 461         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 462
 463         if (global_flags.ten_bit_input) {
 464                 if (!v210Converter::has_hardware_support()) {
 465                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 466                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 467                         exit(1);
 468                 }
 469                 v210_converter.reset(new v210Converter());
 470
 471                 // These are all the widths listed in the Blackmagic SDK documentation
 472                 // (section 2.7.3, “Display Modes”).
 473                 v210_converter->precompile_shader(720);
 474                 v210_converter->precompile_shader(1280);
 475                 v210_converter->precompile_shader(1920);
 476                 v210_converter->precompile_shader(2048);
 477                 v210_converter->precompile_shader(3840);
 478                 v210_converter->precompile_shader(4096);
 479         }
 480         if (global_flags.ten_bit_output) {
 481                 if (!v210Converter::has_hardware_support()) {
 482                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 483                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 484                         exit(1);
 485                 }
 486         }
 487
 488         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 489         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 490         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 491
 492         if (global_flags.enable_alsa_output) {
 493                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 494         }
 495         if (global_flags.output_card != -1) {
 496                 desired_output_card_index = global_flags.output_card;
 497                 set_output_card_internal(global_flags.output_card);
 498         }
 499
 500         output_jitter_history.register_metrics({{ "card", "output" }});
 501 }
 502
 503 Mixer::~Mixer()
 504 {
 505         mjpeg_encoder->stop();
 506         httpd.stop();
 507         BMUSBCapture::stop_bm_thread();
 508
 509         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 510                 cards[card_index].capture->stop_dequeue_thread();
 511                 if (cards[card_index].output) {
 512                         cards[card_index].output->end_output();
 513                         cards[card_index].output.reset();
 514                 }
 515         }
 516
 517         video_encoder.reset(nullptr);
 518 }
 519
 520 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 521 {
 522         printf("Configuring card %d...\n", card_index);
 523
 524         CaptureCard *card = &cards[card_index];
 525         if (card->capture != nullptr) {
 526                 card->capture->stop_dequeue_thread();
 527         }
 528         card->capture.reset(capture);
 529         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 530         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 531         card->may_have_dropped_last_frame = false;
 532         card->type = card_type;
 533         if (card->output.get() != output) {
 534                 card->output.reset(output);
 535         }
 536
 537         PixelFormat pixel_format;
 538         if (card_type == CardType::FFMPEG_INPUT) {
 539                 pixel_format = capture->get_current_pixel_format();
 540         } else if (card_type == CardType::CEF_INPUT) {
 541                 pixel_format = PixelFormat_8BitBGRA;
 542         } else if (global_flags.ten_bit_input) {
 543                 pixel_format = PixelFormat_10BitYCbCr;
 544         } else {
 545                 pixel_format = PixelFormat_8BitYCbCr;
 546         }
 547
 548         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 549         if (card->frame_allocator == nullptr) {
 550                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 551         }
 552         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 553         if (card->surface == nullptr) {
 554                 card->surface = create_surface_with_same_format(mixer_surface);
 555         }
 556         while (!card->new_frames.empty()) card->new_frames.pop_front();
 557         card->last_timecode = -1;
 558         card->capture->set_pixel_format(pixel_format);
 559         card->capture->configure_card();
 560
 561         // NOTE: start_bm_capture() happens in thread_func().
 562
 563         DeviceSpec device;
 564         if (card_type == CardType::FFMPEG_INPUT) {
 565                 device = DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 566         } else {
 567                 device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 568         }
 569         audio_mixer->reset_resampler(device);
 570         audio_mixer->set_display_name(device, card->capture->get_description());
 571         audio_mixer->trigger_state_changed_callback();
 572
 573         // Unregister old metrics, if any.
 574         if (!card->labels.empty()) {
 575                 const vector<pair<string, string>> &labels = card->labels;
 576                 card->jitter_history.unregister_metrics(labels);
 577                 card->queue_length_policy.unregister_metrics(labels);
 578                 global_metrics.remove("input_received_frames", labels);
 579                 global_metrics.remove("input_dropped_frames_jitter", labels);
 580                 global_metrics.remove("input_dropped_frames_error", labels);
 581                 global_metrics.remove("input_dropped_frames_resets", labels);
 582                 global_metrics.remove("input_queue_length_frames", labels);
 583                 global_metrics.remove("input_queue_duped_frames", labels);
 584
 585                 global_metrics.remove("input_has_signal_bool", labels);
 586                 global_metrics.remove("input_is_connected_bool", labels);
 587                 global_metrics.remove("input_interlaced_bool", labels);
 588                 global_metrics.remove("input_width_pixels", labels);
 589                 global_metrics.remove("input_height_pixels", labels);
 590                 global_metrics.remove("input_frame_rate_nom", labels);
 591                 global_metrics.remove("input_frame_rate_den", labels);
 592                 global_metrics.remove("input_sample_rate_hz", labels);
 593         }
 594
 595         // Register metrics.
 596         vector<pair<string, string>> labels;
 597         char card_name[64];
 598         snprintf(card_name, sizeof(card_name), "%d", card_index);
 599         labels.emplace_back("card", card_name);
 600
 601         switch (card_type) {
 602         case CardType::LIVE_CARD:
 603                 labels.emplace_back("cardtype", "live");
 604                 break;
 605         case CardType::FAKE_CAPTURE:
 606                 labels.emplace_back("cardtype", "fake");
 607                 break;
 608         case CardType::FFMPEG_INPUT:
 609                 labels.emplace_back("cardtype", "ffmpeg");
 610                 break;
 611         case CardType::CEF_INPUT:
 612                 labels.emplace_back("cardtype", "cef");
 613                 break;
 614         default:
 615                 assert(false);
 616         }
 617         card->jitter_history.register_metrics(labels);
 618         card->queue_length_policy.register_metrics(labels);
 619         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 620         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 621         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 622         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 623         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 624         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 625
 626         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 627         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 628         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 629         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 630         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 631         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 632         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 633         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 634         card->labels = labels;
 635 }
 636
 637 void Mixer::set_output_card_internal(int card_index)
 638 {
 639         // We don't really need to take card_mutex, since we're in the mixer
 640         // thread and don't mess with any queues (which is the only thing that happens
 641         // from other threads), but it's probably the safest in the long run.
 642         unique_lock<mutex> lock(card_mutex);
 643         if (output_card_index != -1) {
 644                 // Switch the old card from output to input.
 645                 CaptureCard *old_card = &cards[output_card_index];
 646                 old_card->output->end_output();
 647
 648                 // Stop the fake card that we put into place.
 649                 // This needs to _not_ happen under the mutex, to avoid deadlock
 650                 // (delivering the last frame needs to take the mutex).
 651                 CaptureInterface *fake_capture = old_card->capture.get();
 652                 lock.unlock();
 653                 fake_capture->stop_dequeue_thread();
 654                 lock.lock();
 655                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 656                 old_card->is_fake_capture = false;
 657                 old_card->capture->start_bm_capture();
 658         }
 659         if (card_index != -1) {
 660                 CaptureCard *card = &cards[card_index];
 661                 CaptureInterface *capture = card->capture.get();
 662                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 663                 // several seconds to complete (blocking on DisableVideoInput);
 664                 // see if we can maybe do it asynchronously.
 665                 lock.unlock();
 666                 capture->stop_dequeue_thread();
 667                 lock.lock();
 668                 card->parked_capture = move(card->capture);
 669                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 670                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 671                 card->queue_length_policy.reset(card_index);
 672                 card->capture->start_bm_capture();
 673                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 674                 card->output->start_output(desired_output_video_mode, pts_int);
 675         }
 676         output_card_index = card_index;
 677         output_jitter_history.clear();
 678 }
 679
 680 namespace {
 681
 682 int unwrap_timecode(uint16_t current_wrapped, int last)
 683 {
 684         uint16_t last_wrapped = last & 0xffff;
 685         if (current_wrapped > last_wrapped) {
 686                 return (last & ~0xffff) | current_wrapped;
 687         } else {
 688                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 689         }
 690 }
 691
 692 DeviceSpec card_index_to_device(unsigned card_index, unsigned num_cards)
 693 {
 694         if (card_index >= num_cards) {
 695                 return DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 696         } else {
 697                 return DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 698         }
 699 }
 700
 701 }  // namespace
 702
 703 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 704                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 705                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 706 {
 707         DeviceSpec device = card_index_to_device(card_index, num_cards);
 708         CaptureCard *card = &cards[card_index];
 709
 710         ++card->metric_input_received_frames;
 711         card->metric_input_has_signal_bool = video_format.has_signal;
 712         card->metric_input_is_connected_bool = video_format.is_connected;
 713         card->metric_input_interlaced_bool = video_format.interlaced;
 714         card->metric_input_width_pixels = video_format.width;
 715         card->metric_input_height_pixels = video_format.height;
 716         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 717         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 718         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 719
 720         if (is_mode_scanning[card_index]) {
 721                 if (video_format.has_signal) {
 722                         // Found a stable signal, so stop scanning.
 723                         is_mode_scanning[card_index] = false;
 724                 } else {
 725                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 726                         steady_clock::time_point now = steady_clock::now();
 727                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 728                         if (sec_since_last_switch > switch_time_s) {
 729                                 // It isn't this mode; try the next one.
 730                                 mode_scanlist_index[card_index]++;
 731                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 732                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 733                                 last_mode_scan_change[card_index] = now;
 734                         }
 735                 }
 736         }
 737
 738         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 739         assert(frame_length > 0);
 740
 741         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;
 742         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 743                 printf("%s: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
 744                         spec_to_string(device).c_str(), int(audio_frame.len), int(audio_offset),
 745                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 746                 if (video_frame.owner) {
 747                         video_frame.owner->release_frame(video_frame);
 748                 }
 749                 if (audio_frame.owner) {
 750                         audio_frame.owner->release_frame(audio_frame);
 751                 }
 752                 return;
 753         }
 754
 755         int dropped_frames = 0;
 756         if (card->last_timecode != -1) {
 757                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 758         }
 759
 760         // Number of samples per frame if we need to insert silence.
 761         // (Could be nonintegral, but resampling will save us then.)
 762         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 763
 764         if (dropped_frames > MAX_FPS * 2) {
 765                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 766                         spec_to_string(device).c_str(), card->last_timecode, timecode);
 767                 audio_mixer->reset_resampler(device);
 768                 dropped_frames = 0;
 769                 ++card->metric_input_resets;
 770         } else if (dropped_frames > 0) {
 771                 // Insert silence as needed.
 772                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 773                         spec_to_string(device).c_str(), dropped_frames, timecode);
 774                 card->metric_input_dropped_frames_error += dropped_frames;
 775
 776                 bool success;
 777                 do {
 778                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames, frame_length);
 779                 } while (!success);
 780         }
 781
 782         if (num_samples > 0) {
 783                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 784         }
 785
 786         // Done with the audio, so release it.
 787         if (audio_frame.owner) {
 788                 audio_frame.owner->release_frame(audio_frame);
 789         }
 790
 791         card->last_timecode = timecode;
 792
 793         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 794
 795         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 796         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 797         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 798                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 799                 assert(card->type == CardType::FFMPEG_INPUT);
 800                 assert(video_offset == 0);
 801                 expected_length = video_frame.len;
 802
 803                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 804                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 805                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 806                 cbcr_offset = video_format.width * video_format.height;
 807                 y_offset = 0;
 808         } else {
 809                 // All the other Y'CbCr formats are 4:2:2.
 810                 cbcr_width = video_format.width / 2;
 811                 cbcr_height = video_format.height;
 812                 cbcr_offset = video_offset / 2;
 813                 y_offset = video_frame.size / 2 + video_offset / 2;
 814         }
 815         if (video_frame.len - video_offset == 0 ||
 816             video_frame.len - video_offset != expected_length) {
 817                 if (video_frame.len != 0) {
 818                         printf("%s: Dropping video frame with wrong length (%ld; expected %ld)\n",
 819                                 spec_to_string(device).c_str(), video_frame.len - video_offset, expected_length);
 820                 }
 821                 if (video_frame.owner) {
 822                         video_frame.owner->release_frame(video_frame);
 823                 }
 824
 825                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 826                 // so that pts can go up accordingly.
 827                 {
 828                         unique_lock<mutex> lock(card_mutex);
 829                         CaptureCard::NewFrame new_frame;
 830                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 831                         new_frame.length = frame_length;
 832                         new_frame.interlaced = false;
 833                         new_frame.dropped_frames = dropped_frames;
 834                         new_frame.received_timestamp = video_frame.received_timestamp;
 835                         card->new_frames.push_back(move(new_frame));
 836                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 837                 }
 838                 card->new_frames_changed.notify_all();
 839                 return;
 840         }
 841
 842         unsigned num_fields = video_format.interlaced ? 2 : 1;
 843         steady_clock::time_point frame_upload_start;
 844         bool interlaced_stride = false;
 845         if (video_format.interlaced) {
 846                 // Send the two fields along as separate frames; the other side will need to add
 847                 // a deinterlacer to actually get this right.
 848                 assert(video_format.height % 2 == 0);
 849                 video_format.height /= 2;
 850                 cbcr_height /= 2;
 851                 assert(frame_length % 2 == 0);
 852                 frame_length /= 2;
 853                 num_fields = 2;
 854                 if (video_format.second_field_start == 1) {
 855                         interlaced_stride = true;
 856                 }
 857                 frame_upload_start = steady_clock::now();
 858         }
 859         userdata->last_interlaced = video_format.interlaced;
 860         userdata->last_has_signal = video_format.has_signal;
 861         userdata->last_is_connected = video_format.is_connected;
 862         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 863         userdata->last_frame_rate_den = video_format.frame_rate_den;
 864         RefCountedFrame frame(video_frame);
 865
 866         // Upload the textures.
 867         for (unsigned field = 0; field < num_fields; ++field) {
 868                 // Put the actual texture upload in a lambda that is executed in the main thread.
 869                 // It is entirely possible to do this in the same thread (and it might even be
 870                 // faster, depending on the GPU and driver), but it appears to be trickling
 871                 // driver bugs very easily.
 872                 //
 873                 // Note that this means we must hold on to the actual frame data in <userdata>
 874                 // until the upload command is run, but we hold on to <frame> much longer than that
 875                 // (in fact, all the way until we no longer use the texture in rendering).
 876                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 877                         unsigned field_start_line;
 878                         if (field == 1) {
 879                                 field_start_line = video_format.second_field_start;
 880                         } else {
 881                                 field_start_line = video_format.extra_lines_top;
 882                         }
 883
 884                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 885                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 886                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 887
 888                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 889                         check_error();
 890
 891                         switch (userdata->pixel_format) {
 892                         case PixelFormat_10BitYCbCr: {
 893                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 894                                 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);
 895                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 896                                 break;
 897                         }
 898                         case PixelFormat_8BitYCbCr: {
 899                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 900                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 901
 902                                 // Make up our own strides, since we are interleaving.
 903                                 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);
 904                                 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);
 905                                 break;
 906                         }
 907                         case PixelFormat_8BitYCbCrPlanar: {
 908                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 909                                 size_t field_y_start = y_offset;
 910                                 size_t field_cb_start = cbcr_offset;
 911                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 912
 913                                 // Make up our own strides, since we are interleaving.
 914                                 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);
 915                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 916                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 917                                 break;
 918                         }
 919                         case PixelFormat_8BitBGRA: {
 920                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 921                                 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);
 922                                 // These could be asked to deliver mipmaps at any time.
 923                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 924                                 check_error();
 925                                 glGenerateMipmap(GL_TEXTURE_2D);
 926                                 check_error();
 927                                 glBindTexture(GL_TEXTURE_2D, 0);
 928                                 check_error();
 929                                 break;
 930                         }
 931                         default:
 932                                 assert(false);
 933                         }
 934
 935                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 936                         check_error();
 937                 };
 938
 939                 if (field == 1) {
 940                         // Don't upload the second field as fast as we can; wait until
 941                         // the field time has approximately passed. (Otherwise, we could
 942                         // get timing jitter against the other sources, and possibly also
 943                         // against the video display, although the latter is not as critical.)
 944                         // This requires our system clock to be reasonably close to the
 945                         // video clock, but that's not an unreasonable assumption.
 946                         steady_clock::time_point second_field_start = frame_upload_start +
 947                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 948                         this_thread::sleep_until(second_field_start);
 949                 }
 950
 951                 {
 952                         unique_lock<mutex> lock(card_mutex);
 953                         CaptureCard::NewFrame new_frame;
 954                         new_frame.frame = frame;
 955                         new_frame.length = frame_length;
 956                         new_frame.field = field;
 957                         new_frame.interlaced = video_format.interlaced;
 958                         new_frame.upload_func = upload_func;
 959                         new_frame.dropped_frames = dropped_frames;
 960                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 961                         new_frame.video_format = video_format;
 962                         new_frame.y_offset = y_offset;
 963                         new_frame.cbcr_offset = cbcr_offset;
 964                         card->new_frames.push_back(move(new_frame));
 965                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 966                         card->may_have_dropped_last_frame = false;
 967                 }
 968                 card->new_frames_changed.notify_all();
 969         }
 970 }
 971
 972 void Mixer::bm_hotplug_add(libusb_device *dev)
 973 {
 974         lock_guard<mutex> lock(hotplug_mutex);
 975         hotplugged_cards.push_back(dev);
 976 }
 977
 978 void Mixer::bm_hotplug_remove(unsigned card_index)
 979 {
 980         cards[card_index].new_frames_changed.notify_all();
 981 }
 982
 983 void Mixer::thread_func()
 984 {
 985         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 986
 987         eglBindAPI(EGL_OPENGL_API);
 988         QOpenGLContext *context = create_context(mixer_surface);
 989         if (!make_current(context, mixer_surface)) {
 990                 printf("oops\n");
 991                 exit(1);
 992         }
 993
 994         // Start the actual capture. (We don't want to do it before we're actually ready
 995         // to process output frames.)
 996         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 997                 if (int(card_index) != output_card_index) {
 998                         cards[card_index].capture->start_bm_capture();
 999                 }
1000         }
1001
1002         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1003         int stats_dropped_frames = 0;
1004
1005         while (!should_quit) {
1006                 if (desired_output_card_index != output_card_index) {
1007                         set_output_card_internal(desired_output_card_index);
1008                 }
1009                 if (output_card_index != -1 &&
1010                     desired_output_video_mode != output_video_mode) {
1011                         DeckLinkOutput *output = cards[output_card_index].output.get();
1012                         output->end_output();
1013                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1014                         output->start_output(desired_output_video_mode, pts_int);
1015                 }
1016
1017                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1018                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1019
1020                 bool master_card_is_output;
1021                 unsigned master_card_index;
1022                 if (output_card_index != -1) {
1023                         master_card_is_output = true;
1024                         master_card_index = output_card_index;
1025                 } else {
1026                         master_card_is_output = false;
1027                         master_card_index = theme->map_signal(master_clock_channel);
1028                         assert(master_card_index < num_cards + num_video_inputs);
1029                 }
1030
1031                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1032                 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);
1033                 stats_dropped_frames += output_frame_info.dropped_frames;
1034
1035                 handle_hotplugged_cards();
1036
1037                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1038                         DeviceSpec device = card_index_to_device(card_index, num_cards);
1039                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1040                                 continue;
1041                         }
1042                         if (new_frames[card_index].frame->len == 0) {
1043                                 ++new_frames[card_index].dropped_frames;
1044                         }
1045                         if (new_frames[card_index].dropped_frames > 0) {
1046                                 printf("%s dropped %d frames before this\n",
1047                                         spec_to_string(device).c_str(), int(new_frames[card_index].dropped_frames));
1048                         }
1049                 }
1050
1051                 // If the first card is reporting a corrupted or otherwise dropped frame,
1052                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1053                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1054                         ++stats_dropped_frames;
1055                         pts_int += new_frames[master_card_index].length;
1056                         continue;
1057                 }
1058
1059                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1060                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1061                                 continue;
1062
1063                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1064                         assert(new_frame->frame != nullptr);
1065                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1066                         check_error();
1067
1068                         // The new texture might need uploading before use.
1069                         if (new_frame->upload_func) {
1070                                 new_frame->upload_func();
1071                                 new_frame->upload_func = nullptr;
1072                         }
1073
1074                         // Only bother doing MJPEG encoding if there are any connected clients
1075                         // that want the stream.
1076                         if (httpd.get_num_connected_multicam_clients() > 0) {
1077                                 // There are situations where we could possibly want to
1078                                 // include FFmpeg inputs (CEF inputs are unlikely),
1079                                 // but they're not necessarily in 4:2:2 Y'CbCr, so it would
1080                                 // require more functionality the the JPEG encoder.
1081                                 if (card_index < num_cards) {
1082                                         mjpeg_encoder->upload_frame(pts_int, card_index, new_frame->frame, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset);
1083                                 }
1084                         }
1085                 }
1086
1087                 int64_t frame_duration = output_frame_info.frame_duration;
1088                 render_one_frame(frame_duration);
1089                 {
1090                         lock_guard<mutex> lock(frame_num_mutex);
1091                         ++frame_num;
1092                 }
1093                 frame_num_updated.notify_all();
1094                 pts_int += frame_duration;
1095
1096                 basic_stats.update(frame_num, stats_dropped_frames);
1097                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1098
1099                 if (should_cut.exchange(false)) {  // Test and clear.
1100                         video_encoder->do_cut(frame_num);
1101                 }
1102
1103 #if 0
1104                 // Reset every 100 frames, so that local variations in frame times
1105                 // (especially for the first few frames, when the shaders are
1106                 // compiled etc.) don't make it hard to measure for the entire
1107                 // remaining duration of the program.
1108                 if (frame == 10000) {
1109                         frame = 0;
1110                         start = now;
1111                 }
1112 #endif
1113                 check_error();
1114         }
1115
1116         resource_pool->clean_context();
1117 }
1118
1119 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1120 {
1121         if (output_card_index != -1) {
1122                 // The output card (ie., cards[output_card_index].output) is the master clock,
1123                 // so no input card (ie., cards[card_index].capture) is.
1124                 return false;
1125         }
1126         return (card_index == master_card_index);
1127 }
1128
1129 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1130 {
1131         // Count the number of frames in the queue, including any frames
1132         // we dropped. It's hard to know exactly how we should deal with
1133         // dropped (corrupted) input frames; they don't help our goal of
1134         // avoiding starvation, but they still add to the problem of latency.
1135         // Since dropped frames is going to mean a bump in the signal anyway,
1136         // we err on the side of having more stable latency instead.
1137         unsigned queue_length = 0;
1138         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1139                 queue_length += frame.dropped_frames + 1;
1140         }
1141
1142         // If needed, drop frames until the queue is below the safe limit.
1143         // We prefer to drop from the head, because all else being equal,
1144         // we'd like more recent frames (less latency).
1145         unsigned dropped_frames = 0;
1146         while (queue_length > safe_queue_length) {
1147                 assert(!card->new_frames.empty());
1148                 assert(queue_length > card->new_frames.front().dropped_frames);
1149                 queue_length -= card->new_frames.front().dropped_frames;
1150
1151                 if (queue_length <= safe_queue_length) {
1152                         // No need to drop anything.
1153                         break;
1154                 }
1155
1156                 card->new_frames.pop_front();
1157                 card->new_frames_changed.notify_all();
1158                 --queue_length;
1159                 ++dropped_frames;
1160
1161                 if (queue_length == 0 && card->is_cef_capture) {
1162                         card->may_have_dropped_last_frame = true;
1163                 }
1164         }
1165
1166         card->metric_input_dropped_frames_jitter += dropped_frames;
1167         card->metric_input_queue_length_frames = queue_length;
1168
1169 #if 0
1170         if (dropped_frames > 0) {
1171                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1172                         card_index, dropped_frames);
1173         }
1174 #endif
1175 }
1176
1177 pair<string, string> Mixer::get_channels_json()
1178 {
1179         Channels ret;
1180         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1181                 Channel *channel = ret.add_channel();
1182                 channel->set_index(channel_idx);
1183                 channel->set_name(theme->get_channel_name(channel_idx));
1184                 channel->set_color(theme->get_channel_color(channel_idx));
1185         }
1186         string contents;
1187         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1188         return make_pair(contents, "text/json");
1189 }
1190
1191 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1192 {
1193         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1194 }
1195
1196 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])
1197 {
1198         OutputFrameInfo output_frame_info;
1199 start:
1200         unique_lock<mutex> lock(card_mutex, defer_lock);
1201         if (master_card_is_output) {
1202                 // Clocked to the output, so wait for it to be ready for the next frame.
1203                 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);
1204                 lock.lock();
1205         } else {
1206                 // Wait for the master card to have a new frame.
1207                 // TODO: Add a timeout.
1208                 output_frame_info.is_preroll = false;
1209                 lock.lock();
1210                 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(); });
1211         }
1212
1213         if (master_card_is_output) {
1214                 handle_hotplugged_cards();
1215         } else if (cards[master_card_index].new_frames.empty()) {
1216                 // We were woken up, but not due to a new frame. Deal with it
1217                 // and then restart.
1218                 assert(cards[master_card_index].capture->get_disconnected());
1219                 handle_hotplugged_cards();
1220                 lock.unlock();
1221                 goto start;
1222         }
1223
1224         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1225                 CaptureCard *card = &cards[card_index];
1226                 if (card->new_frames.empty()) {  // Starvation.
1227                         ++card->metric_input_duped_frames;
1228 #ifdef HAVE_CEF
1229                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1230                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1231                                 // stream of frames, so we'll have to ask it to repaint the frame
1232                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1233                                 // trim the queue completely away, and cleared when we actually
1234                                 // get a new frame.)
1235                                 ((CEFCapture *)card->capture.get())->request_new_frame();
1236                         }
1237 #endif
1238                 } else {
1239                         new_frames[card_index] = move(card->new_frames.front());
1240                         has_new_frame[card_index] = true;
1241                         card->new_frames.pop_front();
1242                         card->new_frames_changed.notify_all();
1243                 }
1244         }
1245
1246         if (!master_card_is_output) {
1247                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1248                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1249                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1250         }
1251
1252         if (!output_frame_info.is_preroll) {
1253                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1254         }
1255
1256         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1257                 CaptureCard *card = &cards[card_index];
1258                 if (has_new_frame[card_index] &&
1259                     !input_card_is_master_clock(card_index, master_card_index) &&
1260                     !output_frame_info.is_preroll) {
1261                         card->queue_length_policy.update_policy(
1262                                 output_frame_info.frame_timestamp,
1263                                 card->jitter_history.get_expected_next_frame(),
1264                                 new_frames[master_card_index].length,
1265                                 output_frame_info.frame_duration,
1266                                 card->jitter_history.estimate_max_jitter(),
1267                                 output_jitter_history.estimate_max_jitter());
1268                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1269                                                   card->queue_length_policy.get_safe_queue_length()));
1270                 }
1271         }
1272
1273         // This might get off by a fractional sample when changing master card
1274         // between ones with different frame rates, but that's fine.
1275         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1276         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1277         fractional_samples = num_samples_times_timebase % TIMEBASE;
1278         assert(output_frame_info.num_samples >= 0);
1279
1280         return output_frame_info;
1281 }
1282
1283 void Mixer::handle_hotplugged_cards()
1284 {
1285         // Check for cards that have been disconnected since last frame.
1286         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1287                 CaptureCard *card = &cards[card_index];
1288                 if (card->capture->get_disconnected()) {
1289                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1290                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1291                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1292                         card->queue_length_policy.reset(card_index);
1293                         card->capture->start_bm_capture();
1294                 }
1295         }
1296
1297         // Check for cards that have been connected since last frame.
1298         vector<libusb_device *> hotplugged_cards_copy;
1299         {
1300                 lock_guard<mutex> lock(hotplug_mutex);
1301                 swap(hotplugged_cards, hotplugged_cards_copy);
1302         }
1303         for (libusb_device *new_dev : hotplugged_cards_copy) {
1304                 // Look for a fake capture card where we can stick this in.
1305                 int free_card_index = -1;
1306                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1307                         if (cards[card_index].is_fake_capture) {
1308                                 free_card_index = card_index;
1309                                 break;
1310                         }
1311                 }
1312
1313                 if (free_card_index == -1) {
1314                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1315                         libusb_unref_device(new_dev);
1316                 } else {
1317                         // BMUSBCapture takes ownership.
1318                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1319                         CaptureCard *card = &cards[free_card_index];
1320                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1321                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1322                         card->queue_length_policy.reset(free_card_index);
1323                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1324                         capture->start_bm_capture();
1325                 }
1326         }
1327 }
1328
1329
1330 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)
1331 {
1332         // Resample the audio as needed, including from previously dropped frames.
1333         assert(num_cards > 0);
1334         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1335                 const bool dropped_frame = (frame_num != dropped_frames);
1336                 {
1337                         // Signal to the audio thread to process this frame.
1338                         // Note that if the frame is a dropped frame, we signal that
1339                         // we don't want to use this frame as base for adjusting
1340                         // the resampler rate. The reason for this is that the timing
1341                         // of these frames is often way too late; they typically don't
1342                         // “arrive” before we synthesize them. Thus, we could end up
1343                         // in a situation where we have inserted e.g. five audio frames
1344                         // into the queue before we then start pulling five of them
1345                         // back out. This makes ResamplingQueue overestimate the delay,
1346                         // causing undue resampler changes. (We _do_ use the last,
1347                         // non-dropped frame; perhaps we should just discard that as well,
1348                         // since dropped frames are expected to be rare, and it might be
1349                         // better to just wait until we have a slightly more normal situation).
1350                         unique_lock<mutex> lock(audio_mutex);
1351                         bool adjust_rate = !dropped_frame && !is_preroll;
1352                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1353                         audio_task_queue_changed.notify_one();
1354                 }
1355                 if (dropped_frame) {
1356                         // For dropped frames, increase the pts. Note that if the format changed
1357                         // in the meantime, we have no way of detecting that; we just have to
1358                         // assume the frame length is always the same.
1359                         pts_int += length_per_frame;
1360                 }
1361         }
1362 }
1363
1364 void Mixer::render_one_frame(int64_t duration)
1365 {
1366         // Determine the time code for this frame before we start rendering.
1367         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1368         if (display_timecode_on_stdout) {
1369                 printf("Timecode: '%s'\n", timecode_text.c_str());
1370         }
1371
1372         // Update Y'CbCr settings for all cards.
1373         {
1374                 unique_lock<mutex> lock(card_mutex);
1375                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1376                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1377                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1378                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1379                         input_state.full_range[card_index] = interpretation->full_range;
1380                 }
1381         }
1382
1383         // Get the main chain from the theme, and set its state immediately.
1384         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1385         EffectChain *chain = theme_main_chain.chain;
1386         theme_main_chain.setup_chain();
1387         //theme_main_chain.chain->enable_phase_timing(true);
1388
1389         // If HDMI/SDI output is active and the user has requested auto mode,
1390         // its mode overrides the existing Y'CbCr setting for the chain.
1391         YCbCrLumaCoefficients ycbcr_output_coefficients;
1392         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1393                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1394         } else {
1395                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1396         }
1397
1398         // TODO: Reduce the duplication against theme.cpp.
1399         YCbCrFormat output_ycbcr_format;
1400         output_ycbcr_format.chroma_subsampling_x = 1;
1401         output_ycbcr_format.chroma_subsampling_y = 1;
1402         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1403         output_ycbcr_format.full_range = false;
1404         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1405         chain->change_ycbcr_output_format(output_ycbcr_format);
1406
1407         // Render main chain. If we're using zerocopy Quick Sync encoding
1408         // (the default case), we take an extra copy of the created outputs,
1409         // so that we can display it back to the screen later (it's less memory
1410         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1411         // Ideally, we'd like to avoid taking copies and just use the main textures
1412         // for display as well, but they're just views into VA-API memory and must be
1413         // unmapped during encoding, so we can't use them for display, unfortunately.
1414         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1415         GLuint y_copy_tex, cbcr_copy_tex = 0;
1416         GLuint y_display_tex, cbcr_display_tex;
1417         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1418         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1419         const bool is_zerocopy = video_encoder->is_zerocopy();
1420         if (is_zerocopy) {
1421                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1422                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1423                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1424
1425                 y_display_tex = y_copy_tex;
1426                 cbcr_display_tex = cbcr_copy_tex;
1427
1428                 // y_tex and cbcr_tex will be given by VideoEncoder.
1429         } else {
1430                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1431                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1432                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1433
1434                 y_display_tex = y_tex;
1435                 cbcr_display_tex = cbcr_tex;
1436         }
1437
1438         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1439         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1440         assert(got_frame);
1441
1442         GLuint fbo;
1443         if (is_zerocopy) {
1444                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1445         } else {
1446                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1447         }
1448         check_error();
1449         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1450
1451         if (display_timecode_in_stream) {
1452                 // Render the timecode on top.
1453                 timecode_renderer->render_timecode(fbo, timecode_text);
1454         }
1455
1456         resource_pool->release_fbo(fbo);
1457
1458         if (is_zerocopy) {
1459                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1460         } else {
1461                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1462         }
1463         if (output_card_index != -1) {
1464                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1465         }
1466         resource_pool->release_2d_texture(cbcr_full_tex);
1467
1468         // Set the right state for the Y' and CbCr textures we use for display.
1469         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1470         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1471         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1472         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1473         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1474
1475         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1476         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1477         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1478         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1479
1480         RefCountedGLsync fence = video_encoder->end_frame();
1481
1482         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1483         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1484         DisplayFrame live_frame;
1485         live_frame.chain = display_chain.get();
1486         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1487                 display_input->set_texture_num(0, y_display_tex);
1488                 display_input->set_texture_num(1, cbcr_display_tex);
1489         };
1490         live_frame.ready_fence = fence;
1491         live_frame.input_frames = {};
1492         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1493         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1494
1495         // Set up preview and any additional channels.
1496         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1497                 DisplayFrame display_frame;
1498                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1499                 display_frame.chain = move(chain.chain);
1500                 display_frame.setup_chain = move(chain.setup_chain);
1501                 display_frame.ready_fence = fence;
1502                 display_frame.input_frames = move(chain.input_frames);
1503                 display_frame.temp_textures = {};
1504                 output_channel[i].output_frame(move(display_frame));
1505         }
1506 }
1507
1508 void Mixer::audio_thread_func()
1509 {
1510         pthread_setname_np(pthread_self(), "Mixer_Audio");
1511
1512         while (!should_quit) {
1513                 AudioTask task;
1514
1515                 {
1516                         unique_lock<mutex> lock(audio_mutex);
1517                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1518                         if (should_quit) {
1519                                 return;
1520                         }
1521                         task = audio_task_queue.front();
1522                         audio_task_queue.pop();
1523                 }
1524
1525                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1526                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1527                 vector<float> samples_out = audio_mixer->get_output(
1528                         task.frame_timestamp,
1529                         task.num_samples,
1530                         rate_adjustment_policy);
1531
1532                 // Send the samples to the sound card, then add them to the output.
1533                 if (alsa) {
1534                         alsa->write(samples_out);
1535                 }
1536                 if (output_card_index != -1) {
1537                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1538                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1539                 }
1540                 video_encoder->add_audio(task.pts_int, move(samples_out));
1541         }
1542 }
1543
1544 void Mixer::release_display_frame(DisplayFrame *frame)
1545 {
1546         for (GLuint texnum : frame->temp_textures) {
1547                 resource_pool->release_2d_texture(texnum);
1548         }
1549         frame->temp_textures.clear();
1550         frame->ready_fence.reset();
1551         frame->input_frames.clear();
1552 }
1553
1554 void Mixer::start()
1555 {
1556         mixer_thread = thread(&Mixer::thread_func, this);
1557         audio_thread = thread(&Mixer::audio_thread_func, this);
1558 }
1559
1560 void Mixer::quit()
1561 {
1562         should_quit = true;
1563         audio_task_queue_changed.notify_one();
1564         mixer_thread.join();
1565         audio_thread.join();
1566 }
1567
1568 void Mixer::transition_clicked(int transition_num)
1569 {
1570         theme->transition_clicked(transition_num, pts());
1571 }
1572
1573 void Mixer::channel_clicked(int preview_num)
1574 {
1575         theme->channel_clicked(preview_num);
1576 }
1577
1578 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1579 {
1580         unique_lock<mutex> lock(card_mutex);
1581         return ycbcr_interpretation[card_index];
1582 }
1583
1584 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1585 {
1586         unique_lock<mutex> lock(card_mutex);
1587         ycbcr_interpretation[card_index] = interpretation;
1588 }
1589
1590 void Mixer::start_mode_scanning(unsigned card_index)
1591 {
1592         assert(card_index < num_cards);
1593         if (is_mode_scanning[card_index]) {
1594                 return;
1595         }
1596         is_mode_scanning[card_index] = true;
1597         mode_scanlist[card_index].clear();
1598         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1599                 mode_scanlist[card_index].push_back(mode.first);
1600         }
1601         assert(!mode_scanlist[card_index].empty());
1602         mode_scanlist_index[card_index] = 0;
1603         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1604         last_mode_scan_change[card_index] = steady_clock::now();
1605 }
1606
1607 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1608 {
1609         assert(desired_output_card_index != -1);
1610         unique_lock<mutex> lock(card_mutex);
1611         return cards[desired_output_card_index].output->get_available_video_modes();
1612 }
1613
1614 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1615 {
1616         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1617         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1618 }
1619
1620 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1621         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1622         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1623 }
1624
1625 void Mixer::wait_for_next_frame()
1626 {
1627         unique_lock<mutex> lock(frame_num_mutex);
1628         unsigned old_frame_num = frame_num;
1629         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
1630                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1631 }
1632
1633 Mixer::OutputChannel::~OutputChannel()
1634 {
1635         if (has_current_frame) {
1636                 parent->release_display_frame(&current_frame);
1637         }
1638         if (has_ready_frame) {
1639                 parent->release_display_frame(&ready_frame);
1640         }
1641 }
1642
1643 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1644 {
1645         // Store this frame for display. Remove the ready frame if any
1646         // (it was seemingly never used).
1647         {
1648                 unique_lock<mutex> lock(frame_mutex);
1649                 if (has_ready_frame) {
1650                         parent->release_display_frame(&ready_frame);
1651                 }
1652                 ready_frame = move(frame);
1653                 has_ready_frame = true;
1654
1655                 // Call the callbacks under the mutex (they should be short),
1656                 // so that we don't race against a callback removal.
1657                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1658                         key_and_callback.second();
1659                 }
1660         }
1661
1662         // Reduce the number of callbacks by filtering duplicates. The reason
1663         // why we bother doing this is that Qt seemingly can get into a state
1664         // where its builds up an essentially unbounded queue of signals,
1665         // consuming more and more memory, and there's no good way of collapsing
1666         // user-defined signals or limiting the length of the queue.
1667         if (transition_names_updated_callback) {
1668                 vector<string> transition_names = global_mixer->get_transition_names();
1669                 bool changed = false;
1670                 if (transition_names.size() != last_transition_names.size()) {
1671                         changed = true;
1672                 } else {
1673                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1674                                 if (transition_names[i] != last_transition_names[i]) {
1675                                         changed = true;
1676                                         break;
1677                                 }
1678                         }
1679                 }
1680                 if (changed) {
1681                         transition_names_updated_callback(transition_names);
1682                         last_transition_names = transition_names;
1683                 }
1684         }
1685         if (name_updated_callback) {
1686                 string name = global_mixer->get_channel_name(channel);
1687                 if (name != last_name) {
1688                         name_updated_callback(name);
1689                         last_name = name;
1690                 }
1691         }
1692         if (color_updated_callback) {
1693                 string color = global_mixer->get_channel_color(channel);
1694                 if (color != last_color) {
1695                         color_updated_callback(color);
1696                         last_color = color;
1697                 }
1698         }
1699 }
1700
1701 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1702 {
1703         unique_lock<mutex> lock(frame_mutex);
1704         if (!has_current_frame && !has_ready_frame) {
1705                 return false;
1706         }
1707
1708         if (has_current_frame && has_ready_frame) {
1709                 // We have a new ready frame. Toss the current one.
1710                 parent->release_display_frame(&current_frame);
1711                 has_current_frame = false;
1712         }
1713         if (has_ready_frame) {
1714                 assert(!has_current_frame);
1715                 current_frame = move(ready_frame);
1716                 ready_frame.ready_fence.reset();  // Drop the refcount.
1717                 ready_frame.input_frames.clear();  // Drop the refcounts.
1718                 has_current_frame = true;
1719                 has_ready_frame = false;
1720         }
1721
1722         *frame = current_frame;
1723         return true;
1724 }
1725
1726 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1727 {
1728         unique_lock<mutex> lock(frame_mutex);
1729         new_frame_ready_callbacks[key] = callback;
1730 }
1731
1732 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1733 {
1734         unique_lock<mutex> lock(frame_mutex);
1735         new_frame_ready_callbacks.erase(key);
1736 }
1737
1738 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1739 {
1740         transition_names_updated_callback = callback;
1741 }
1742
1743 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1744 {
1745         name_updated_callback = callback;
1746 }
1747
1748 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1749 {
1750         color_updated_callback = callback;
1751 }
1752
1753 mutex RefCountedGLsync::fence_lock;