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         if (!global_flags.card_to_mjpeg_stream_export.empty()) {
 362                 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
 363         }
 364
 365         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 366         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 367
 368         // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
 369         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 370         audio_mixer.reset(new AudioMixer(num_cards, video_inputs.size()));
 371
 372         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 373         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
 374                 char url[256];
 375                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
 376                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
 377         }
 378
 379         // Start listening for clients only once VideoEncoder has written its header, if any.
 380         httpd.start(global_flags.http_port);
 381
 382         // First try initializing the then PCI devices, then USB, then
 383         // fill up with fake cards until we have the desired number of cards.
 384         unsigned num_pci_devices = 0;
 385         unsigned card_index = 0;
 386
 387         {
 388                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 389                 if (decklink_iterator != nullptr) {
 390                         for ( ; card_index < num_cards; ++card_index) {
 391                                 IDeckLink *decklink;
 392                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 393                                         break;
 394                                 }
 395
 396                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 397                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 398                                 if (!output->set_device(decklink)) {
 399                                         delete output;
 400                                         output = nullptr;
 401                                 }
 402                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 403                                 ++num_pci_devices;
 404                         }
 405                         decklink_iterator->Release();
 406                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 407                 } else {
 408                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 409                 }
 410         }
 411
 412         unsigned num_usb_devices = BMUSBCapture::num_cards();
 413         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 414                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 415                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 416                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 417         }
 418         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 419
 420         unsigned num_fake_cards = 0;
 421         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 422                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 423                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 424         }
 425
 426         if (num_fake_cards > 0) {
 427                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 428         }
 429
 430         // Initialize all video inputs the theme asked for. Note that these are
 431         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 432         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 433                 if (card_index >= MAX_VIDEO_CARDS) {
 434                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 435                         exit(1);
 436                 }
 437                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 438                 video_inputs[video_card_index]->set_card_index(card_index);
 439         }
 440         num_video_inputs = video_inputs.size();
 441
 442 #ifdef HAVE_CEF
 443         // Same, for HTML inputs.
 444         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 445         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 446                 if (card_index >= MAX_VIDEO_CARDS) {
 447                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 448                         exit(1);
 449                 }
 450                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
 451                 html_inputs[html_card_index]->set_card_index(card_index);
 452         }
 453         num_html_inputs = html_inputs.size();
 454 #endif
 455
 456         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 457         BMUSBCapture::start_bm_thread();
 458
 459         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 460                 cards[card_index].queue_length_policy.reset(card_index);
 461         }
 462
 463         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 464
 465         if (global_flags.ten_bit_input) {
 466                 if (!v210Converter::has_hardware_support()) {
 467                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 468                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 469                         exit(1);
 470                 }
 471                 v210_converter.reset(new v210Converter());
 472
 473                 // These are all the widths listed in the Blackmagic SDK documentation
 474                 // (section 2.7.3, “Display Modes”).
 475                 v210_converter->precompile_shader(720);
 476                 v210_converter->precompile_shader(1280);
 477                 v210_converter->precompile_shader(1920);
 478                 v210_converter->precompile_shader(2048);
 479                 v210_converter->precompile_shader(3840);
 480                 v210_converter->precompile_shader(4096);
 481         }
 482         if (global_flags.ten_bit_output) {
 483                 if (!v210Converter::has_hardware_support()) {
 484                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 485                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 486                         exit(1);
 487                 }
 488         }
 489
 490         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 491         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 492         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 493
 494         if (global_flags.enable_alsa_output) {
 495                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 496         }
 497         if (global_flags.output_card != -1) {
 498                 desired_output_card_index = global_flags.output_card;
 499                 set_output_card_internal(global_flags.output_card);
 500         }
 501
 502         output_jitter_history.register_metrics({{ "card", "output" }});
 503 }
 504
 505 Mixer::~Mixer()
 506 {
 507         if (mjpeg_encoder != nullptr) {
 508                 mjpeg_encoder->stop();
 509         }
 510         httpd.stop();
 511         BMUSBCapture::stop_bm_thread();
 512
 513         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 514                 cards[card_index].capture->stop_dequeue_thread();
 515                 if (cards[card_index].output) {
 516                         cards[card_index].output->end_output();
 517                         cards[card_index].output.reset();
 518                 }
 519         }
 520
 521         video_encoder.reset(nullptr);
 522 }
 523
 524 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 525 {
 526         printf("Configuring card %d...\n", card_index);
 527
 528         CaptureCard *card = &cards[card_index];
 529         if (card->capture != nullptr) {
 530                 card->capture->stop_dequeue_thread();
 531         }
 532         card->capture.reset(capture);
 533         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 534         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 535         card->may_have_dropped_last_frame = false;
 536         card->type = card_type;
 537         if (card->output.get() != output) {
 538                 card->output.reset(output);
 539         }
 540
 541         PixelFormat pixel_format;
 542         if (card_type == CardType::FFMPEG_INPUT) {
 543                 pixel_format = capture->get_current_pixel_format();
 544         } else if (card_type == CardType::CEF_INPUT) {
 545                 pixel_format = PixelFormat_8BitBGRA;
 546         } else if (global_flags.ten_bit_input) {
 547                 pixel_format = PixelFormat_10BitYCbCr;
 548         } else {
 549                 pixel_format = PixelFormat_8BitYCbCr;
 550         }
 551
 552         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 553         if (card->frame_allocator == nullptr) {
 554                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 555         }
 556         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 557         if (card->surface == nullptr) {
 558                 card->surface = create_surface_with_same_format(mixer_surface);
 559         }
 560         while (!card->new_frames.empty()) card->new_frames.pop_front();
 561         card->last_timecode = -1;
 562         card->capture->set_pixel_format(pixel_format);
 563         card->capture->configure_card();
 564
 565         // NOTE: start_bm_capture() happens in thread_func().
 566
 567         DeviceSpec device;
 568         if (card_type == CardType::FFMPEG_INPUT) {
 569                 device = DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 570         } else {
 571                 device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 572         }
 573         audio_mixer->reset_resampler(device);
 574         audio_mixer->set_display_name(device, card->capture->get_description());
 575         audio_mixer->trigger_state_changed_callback();
 576
 577         // Unregister old metrics, if any.
 578         if (!card->labels.empty()) {
 579                 const vector<pair<string, string>> &labels = card->labels;
 580                 card->jitter_history.unregister_metrics(labels);
 581                 card->queue_length_policy.unregister_metrics(labels);
 582                 global_metrics.remove("input_received_frames", labels);
 583                 global_metrics.remove("input_dropped_frames_jitter", labels);
 584                 global_metrics.remove("input_dropped_frames_error", labels);
 585                 global_metrics.remove("input_dropped_frames_resets", labels);
 586                 global_metrics.remove("input_queue_length_frames", labels);
 587                 global_metrics.remove("input_queue_duped_frames", labels);
 588
 589                 global_metrics.remove("input_has_signal_bool", labels);
 590                 global_metrics.remove("input_is_connected_bool", labels);
 591                 global_metrics.remove("input_interlaced_bool", labels);
 592                 global_metrics.remove("input_width_pixels", labels);
 593                 global_metrics.remove("input_height_pixels", labels);
 594                 global_metrics.remove("input_frame_rate_nom", labels);
 595                 global_metrics.remove("input_frame_rate_den", labels);
 596                 global_metrics.remove("input_sample_rate_hz", labels);
 597         }
 598
 599         // Register metrics.
 600         vector<pair<string, string>> labels;
 601         char card_name[64];
 602         snprintf(card_name, sizeof(card_name), "%d", card_index);
 603         labels.emplace_back("card", card_name);
 604
 605         switch (card_type) {
 606         case CardType::LIVE_CARD:
 607                 labels.emplace_back("cardtype", "live");
 608                 break;
 609         case CardType::FAKE_CAPTURE:
 610                 labels.emplace_back("cardtype", "fake");
 611                 break;
 612         case CardType::FFMPEG_INPUT:
 613                 labels.emplace_back("cardtype", "ffmpeg");
 614                 break;
 615         case CardType::CEF_INPUT:
 616                 labels.emplace_back("cardtype", "cef");
 617                 break;
 618         default:
 619                 assert(false);
 620         }
 621         card->jitter_history.register_metrics(labels);
 622         card->queue_length_policy.register_metrics(labels);
 623         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 624         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 625         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 626         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 627         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 628         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 629
 630         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 631         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 632         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 633         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 634         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 635         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 636         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 637         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 638         card->labels = labels;
 639 }
 640
 641 void Mixer::set_output_card_internal(int card_index)
 642 {
 643         // We don't really need to take card_mutex, since we're in the mixer
 644         // thread and don't mess with any queues (which is the only thing that happens
 645         // from other threads), but it's probably the safest in the long run.
 646         unique_lock<mutex> lock(card_mutex);
 647         if (output_card_index != -1) {
 648                 // Switch the old card from output to input.
 649                 CaptureCard *old_card = &cards[output_card_index];
 650                 old_card->output->end_output();
 651
 652                 // Stop the fake card that we put into place.
 653                 // This needs to _not_ happen under the mutex, to avoid deadlock
 654                 // (delivering the last frame needs to take the mutex).
 655                 CaptureInterface *fake_capture = old_card->capture.get();
 656                 lock.unlock();
 657                 fake_capture->stop_dequeue_thread();
 658                 lock.lock();
 659                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 660                 old_card->is_fake_capture = false;
 661                 old_card->capture->start_bm_capture();
 662         }
 663         if (card_index != -1) {
 664                 CaptureCard *card = &cards[card_index];
 665                 CaptureInterface *capture = card->capture.get();
 666                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 667                 // several seconds to complete (blocking on DisableVideoInput);
 668                 // see if we can maybe do it asynchronously.
 669                 lock.unlock();
 670                 capture->stop_dequeue_thread();
 671                 lock.lock();
 672                 card->parked_capture = move(card->capture);
 673                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 674                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 675                 card->queue_length_policy.reset(card_index);
 676                 card->capture->start_bm_capture();
 677                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 678                 card->output->start_output(desired_output_video_mode, pts_int);
 679         }
 680         output_card_index = card_index;
 681         output_jitter_history.clear();
 682 }
 683
 684 namespace {
 685
 686 int unwrap_timecode(uint16_t current_wrapped, int last)
 687 {
 688         uint16_t last_wrapped = last & 0xffff;
 689         if (current_wrapped > last_wrapped) {
 690                 return (last & ~0xffff) | current_wrapped;
 691         } else {
 692                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 693         }
 694 }
 695
 696 DeviceSpec card_index_to_device(unsigned card_index, unsigned num_cards)
 697 {
 698         if (card_index >= num_cards) {
 699                 return DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
 700         } else {
 701                 return DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
 702         }
 703 }
 704
 705 }  // namespace
 706
 707 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 708                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 709                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 710 {
 711         DeviceSpec device = card_index_to_device(card_index, num_cards);
 712         CaptureCard *card = &cards[card_index];
 713
 714         ++card->metric_input_received_frames;
 715         card->metric_input_has_signal_bool = video_format.has_signal;
 716         card->metric_input_is_connected_bool = video_format.is_connected;
 717         card->metric_input_interlaced_bool = video_format.interlaced;
 718         card->metric_input_width_pixels = video_format.width;
 719         card->metric_input_height_pixels = video_format.height;
 720         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 721         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 722         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 723
 724         if (is_mode_scanning[card_index]) {
 725                 if (video_format.has_signal) {
 726                         // Found a stable signal, so stop scanning.
 727                         is_mode_scanning[card_index] = false;
 728                 } else {
 729                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 730                         steady_clock::time_point now = steady_clock::now();
 731                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 732                         if (sec_since_last_switch > switch_time_s) {
 733                                 // It isn't this mode; try the next one.
 734                                 mode_scanlist_index[card_index]++;
 735                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 736                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 737                                 last_mode_scan_change[card_index] = now;
 738                         }
 739                 }
 740         }
 741
 742         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 743         assert(frame_length > 0);
 744
 745         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;
 746         if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
 747                 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",
 748                         spec_to_string(device).c_str(), int(audio_frame.len), int(audio_offset),
 749                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 750                 if (video_frame.owner) {
 751                         video_frame.owner->release_frame(video_frame);
 752                 }
 753                 if (audio_frame.owner) {
 754                         audio_frame.owner->release_frame(audio_frame);
 755                 }
 756                 return;
 757         }
 758
 759         int dropped_frames = 0;
 760         if (card->last_timecode != -1) {
 761                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 762         }
 763
 764         // Number of samples per frame if we need to insert silence.
 765         // (Could be nonintegral, but resampling will save us then.)
 766         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 767
 768         if (dropped_frames > MAX_FPS * 2) {
 769                 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 770                         spec_to_string(device).c_str(), card->last_timecode, timecode);
 771                 audio_mixer->reset_resampler(device);
 772                 dropped_frames = 0;
 773                 ++card->metric_input_resets;
 774         } else if (dropped_frames > 0) {
 775                 // Insert silence as needed.
 776                 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 777                         spec_to_string(device).c_str(), dropped_frames, timecode);
 778                 card->metric_input_dropped_frames_error += dropped_frames;
 779
 780                 bool success;
 781                 do {
 782                         success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
 783                 } while (!success);
 784         }
 785
 786         if (num_samples > 0) {
 787                 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
 788         }
 789
 790         // Done with the audio, so release it.
 791         if (audio_frame.owner) {
 792                 audio_frame.owner->release_frame(audio_frame);
 793         }
 794
 795         card->last_timecode = timecode;
 796
 797         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 798         if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
 799                 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
 800                 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
 801                 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
 802         }
 803
 804         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 805         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 806         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 807                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 808                 assert(card->type == CardType::FFMPEG_INPUT);
 809                 assert(video_offset == 0);
 810                 expected_length = video_frame.len;
 811
 812                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 813                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 814                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 815                 cbcr_offset = video_format.width * video_format.height;
 816                 y_offset = 0;
 817         } else {
 818                 // All the other Y'CbCr formats are 4:2:2.
 819                 cbcr_width = video_format.width / 2;
 820                 cbcr_height = video_format.height;
 821                 cbcr_offset = video_offset / 2;
 822                 y_offset = video_frame.size / 2 + video_offset / 2;
 823         }
 824         if (video_frame.len - video_offset == 0 ||
 825             video_frame.len - video_offset != expected_length) {
 826                 if (video_frame.len != 0) {
 827                         printf("%s: Dropping video frame with wrong length (%ld; expected %ld)\n",
 828                                 spec_to_string(device).c_str(), video_frame.len - video_offset, expected_length);
 829                 }
 830                 if (video_frame.owner) {
 831                         video_frame.owner->release_frame(video_frame);
 832                 }
 833
 834                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 835                 // so that pts can go up accordingly.
 836                 {
 837                         lock_guard<mutex> lock(card_mutex);
 838                         CaptureCard::NewFrame new_frame;
 839                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 840                         new_frame.length = frame_length;
 841                         new_frame.interlaced = false;
 842                         new_frame.dropped_frames = dropped_frames;
 843                         new_frame.received_timestamp = video_frame.received_timestamp;
 844                         card->new_frames.push_back(move(new_frame));
 845                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 846                 }
 847                 card->new_frames_changed.notify_all();
 848                 return;
 849         }
 850
 851         unsigned num_fields = video_format.interlaced ? 2 : 1;
 852         steady_clock::time_point frame_upload_start;
 853         bool interlaced_stride = false;
 854         if (video_format.interlaced) {
 855                 // Send the two fields along as separate frames; the other side will need to add
 856                 // a deinterlacer to actually get this right.
 857                 assert(video_format.height % 2 == 0);
 858                 video_format.height /= 2;
 859                 cbcr_height /= 2;
 860                 assert(frame_length % 2 == 0);
 861                 frame_length /= 2;
 862                 num_fields = 2;
 863                 if (video_format.second_field_start == 1) {
 864                         interlaced_stride = true;
 865                 }
 866                 frame_upload_start = steady_clock::now();
 867         }
 868         assert(userdata != nullptr);
 869         userdata->last_interlaced = video_format.interlaced;
 870         userdata->last_has_signal = video_format.has_signal;
 871         userdata->last_is_connected = video_format.is_connected;
 872         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 873         userdata->last_frame_rate_den = video_format.frame_rate_den;
 874         RefCountedFrame frame(video_frame);
 875
 876         // Upload the textures.
 877         for (unsigned field = 0; field < num_fields; ++field) {
 878                 // Put the actual texture upload in a lambda that is executed in the main thread.
 879                 // It is entirely possible to do this in the same thread (and it might even be
 880                 // faster, depending on the GPU and driver), but it appears to be trickling
 881                 // driver bugs very easily.
 882                 //
 883                 // Note that this means we must hold on to the actual frame data in <userdata>
 884                 // until the upload command is run, but we hold on to <frame> much longer than that
 885                 // (in fact, all the way until we no longer use the texture in rendering).
 886                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 887                         unsigned field_start_line;
 888                         if (field == 1) {
 889                                 field_start_line = video_format.second_field_start;
 890                         } else {
 891                                 field_start_line = video_format.extra_lines_top;
 892                         }
 893
 894                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 895                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 896                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 897
 898                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 899                         check_error();
 900
 901                         switch (userdata->pixel_format) {
 902                         case PixelFormat_10BitYCbCr: {
 903                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 904                                 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);
 905                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 906                                 break;
 907                         }
 908                         case PixelFormat_8BitYCbCr: {
 909                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 910                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 911
 912                                 // Make up our own strides, since we are interleaving.
 913                                 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);
 914                                 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);
 915                                 break;
 916                         }
 917                         case PixelFormat_8BitYCbCrPlanar: {
 918                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 919                                 size_t field_y_start = y_offset;
 920                                 size_t field_cb_start = cbcr_offset;
 921                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 922
 923                                 // Make up our own strides, since we are interleaving.
 924                                 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);
 925                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 926                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 927                                 break;
 928                         }
 929                         case PixelFormat_8BitBGRA: {
 930                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 931                                 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);
 932                                 // These could be asked to deliver mipmaps at any time.
 933                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 934                                 check_error();
 935                                 glGenerateMipmap(GL_TEXTURE_2D);
 936                                 check_error();
 937                                 glBindTexture(GL_TEXTURE_2D, 0);
 938                                 check_error();
 939                                 break;
 940                         }
 941                         default:
 942                                 assert(false);
 943                         }
 944
 945                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 946                         check_error();
 947                 };
 948
 949                 if (field == 1) {
 950                         // Don't upload the second field as fast as we can; wait until
 951                         // the field time has approximately passed. (Otherwise, we could
 952                         // get timing jitter against the other sources, and possibly also
 953                         // against the video display, although the latter is not as critical.)
 954                         // This requires our system clock to be reasonably close to the
 955                         // video clock, but that's not an unreasonable assumption.
 956                         steady_clock::time_point second_field_start = frame_upload_start +
 957                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 958                         this_thread::sleep_until(second_field_start);
 959                 }
 960
 961                 {
 962                         lock_guard<mutex> lock(card_mutex);
 963                         CaptureCard::NewFrame new_frame;
 964                         new_frame.frame = frame;
 965                         new_frame.length = frame_length;
 966                         new_frame.field = field;
 967                         new_frame.interlaced = video_format.interlaced;
 968                         new_frame.upload_func = upload_func;
 969                         new_frame.dropped_frames = dropped_frames;
 970                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 971                         new_frame.video_format = video_format;
 972                         new_frame.y_offset = y_offset;
 973                         new_frame.cbcr_offset = cbcr_offset;
 974                         card->new_frames.push_back(move(new_frame));
 975                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 976                         card->may_have_dropped_last_frame = false;
 977                 }
 978                 card->new_frames_changed.notify_all();
 979         }
 980 }
 981
 982 void Mixer::bm_hotplug_add(libusb_device *dev)
 983 {
 984         lock_guard<mutex> lock(hotplug_mutex);
 985         hotplugged_cards.push_back(dev);
 986 }
 987
 988 void Mixer::bm_hotplug_remove(unsigned card_index)
 989 {
 990         cards[card_index].new_frames_changed.notify_all();
 991 }
 992
 993 void Mixer::thread_func()
 994 {
 995         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 996
 997         eglBindAPI(EGL_OPENGL_API);
 998         QOpenGLContext *context = create_context(mixer_surface);
 999         if (!make_current(context, mixer_surface)) {
1000                 printf("oops\n");
1001                 exit(1);
1002         }
1003
1004         // Start the actual capture. (We don't want to do it before we're actually ready
1005         // to process output frames.)
1006         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1007                 if (int(card_index) != output_card_index) {
1008                         cards[card_index].capture->start_bm_capture();
1009                 }
1010         }
1011
1012         BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1013         int stats_dropped_frames = 0;
1014
1015         while (!should_quit) {
1016                 if (desired_output_card_index != output_card_index) {
1017                         set_output_card_internal(desired_output_card_index);
1018                 }
1019                 if (output_card_index != -1 &&
1020                     desired_output_video_mode != output_video_mode) {
1021                         DeckLinkOutput *output = cards[output_card_index].output.get();
1022                         output->end_output();
1023                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1024                         output->start_output(desired_output_video_mode, pts_int);
1025                 }
1026
1027                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1028                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1029
1030                 bool master_card_is_output;
1031                 unsigned master_card_index;
1032                 if (output_card_index != -1) {
1033                         master_card_is_output = true;
1034                         master_card_index = output_card_index;
1035                 } else {
1036                         master_card_is_output = false;
1037                         master_card_index = theme->map_signal(master_clock_channel);
1038                         assert(master_card_index < num_cards + num_video_inputs);
1039                 }
1040
1041                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1042                 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);
1043                 stats_dropped_frames += output_frame_info.dropped_frames;
1044
1045                 handle_hotplugged_cards();
1046
1047                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1048                         DeviceSpec device = card_index_to_device(card_index, num_cards);
1049                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1050                                 continue;
1051                         }
1052                         if (new_frames[card_index].frame->len == 0) {
1053                                 ++new_frames[card_index].dropped_frames;
1054                         }
1055                         if (new_frames[card_index].dropped_frames > 0) {
1056                                 printf("%s dropped %d frames before this\n",
1057                                         spec_to_string(device).c_str(), int(new_frames[card_index].dropped_frames));
1058                         }
1059                 }
1060
1061                 // If the first card is reporting a corrupted or otherwise dropped frame,
1062                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1063                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1064                         ++stats_dropped_frames;
1065                         pts_int += new_frames[master_card_index].length;
1066                         continue;
1067                 }
1068
1069                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1070                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1071                                 continue;
1072
1073                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1074                         assert(new_frame->frame != nullptr);
1075                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1076                         check_error();
1077
1078                         // The new texture might need uploading before use.
1079                         if (new_frame->upload_func) {
1080                                 new_frame->upload_func();
1081                                 new_frame->upload_func = nullptr;
1082                         }
1083
1084                         // Only bother doing MJPEG encoding if there are any connected clients
1085                         // that want the stream. FIXME: We should also stop memcpy-ing if there are none!
1086                         if (httpd.get_num_connected_multicam_clients() > 0) {
1087                                 auto stream_it = global_flags.card_to_mjpeg_stream_export.find(card_index);
1088                                 if (stream_it != global_flags.card_to_mjpeg_stream_export.end()) {
1089                                         mjpeg_encoder->upload_frame(pts_int, stream_it->second, new_frame->frame, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset);
1090                                 }
1091                         }
1092                 }
1093
1094                 int64_t frame_duration = output_frame_info.frame_duration;
1095                 render_one_frame(frame_duration);
1096                 {
1097                         lock_guard<mutex> lock(frame_num_mutex);
1098                         ++frame_num;
1099                 }
1100                 frame_num_updated.notify_all();
1101                 pts_int += frame_duration;
1102
1103                 basic_stats.update(frame_num, stats_dropped_frames);
1104                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1105
1106                 if (should_cut.exchange(false)) {  // Test and clear.
1107                         video_encoder->do_cut(frame_num);
1108                 }
1109
1110 #if 0
1111                 // Reset every 100 frames, so that local variations in frame times
1112                 // (especially for the first few frames, when the shaders are
1113                 // compiled etc.) don't make it hard to measure for the entire
1114                 // remaining duration of the program.
1115                 if (frame == 10000) {
1116                         frame = 0;
1117                         start = now;
1118                 }
1119 #endif
1120                 check_error();
1121         }
1122
1123         resource_pool->clean_context();
1124 }
1125
1126 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1127 {
1128         if (output_card_index != -1) {
1129                 // The output card (ie., cards[output_card_index].output) is the master clock,
1130                 // so no input card (ie., cards[card_index].capture) is.
1131                 return false;
1132         }
1133         return (card_index == master_card_index);
1134 }
1135
1136 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1137 {
1138         // Count the number of frames in the queue, including any frames
1139         // we dropped. It's hard to know exactly how we should deal with
1140         // dropped (corrupted) input frames; they don't help our goal of
1141         // avoiding starvation, but they still add to the problem of latency.
1142         // Since dropped frames is going to mean a bump in the signal anyway,
1143         // we err on the side of having more stable latency instead.
1144         unsigned queue_length = 0;
1145         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1146                 queue_length += frame.dropped_frames + 1;
1147         }
1148
1149         // If needed, drop frames until the queue is below the safe limit.
1150         // We prefer to drop from the head, because all else being equal,
1151         // we'd like more recent frames (less latency).
1152         unsigned dropped_frames = 0;
1153         while (queue_length > safe_queue_length) {
1154                 assert(!card->new_frames.empty());
1155                 assert(queue_length > card->new_frames.front().dropped_frames);
1156                 queue_length -= card->new_frames.front().dropped_frames;
1157
1158                 if (queue_length <= safe_queue_length) {
1159                         // No need to drop anything.
1160                         break;
1161                 }
1162
1163                 card->new_frames.pop_front();
1164                 card->new_frames_changed.notify_all();
1165                 --queue_length;
1166                 ++dropped_frames;
1167
1168                 if (queue_length == 0 && card->is_cef_capture) {
1169                         card->may_have_dropped_last_frame = true;
1170                 }
1171         }
1172
1173         card->metric_input_dropped_frames_jitter += dropped_frames;
1174         card->metric_input_queue_length_frames = queue_length;
1175
1176 #if 0
1177         if (dropped_frames > 0) {
1178                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1179                         card_index, dropped_frames);
1180         }
1181 #endif
1182 }
1183
1184 pair<string, string> Mixer::get_channels_json()
1185 {
1186         Channels ret;
1187         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1188                 Channel *channel = ret.add_channel();
1189                 channel->set_index(channel_idx);
1190                 channel->set_name(theme->get_channel_name(channel_idx));
1191                 channel->set_color(theme->get_channel_color(channel_idx));
1192         }
1193         string contents;
1194         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1195         return make_pair(contents, "text/json");
1196 }
1197
1198 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1199 {
1200         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1201 }
1202
1203 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])
1204 {
1205         OutputFrameInfo output_frame_info;
1206 start:
1207         unique_lock<mutex> lock(card_mutex, defer_lock);
1208         if (master_card_is_output) {
1209                 // Clocked to the output, so wait for it to be ready for the next frame.
1210                 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);
1211                 lock.lock();
1212         } else {
1213                 // Wait for the master card to have a new frame.
1214                 // TODO: Add a timeout.
1215                 output_frame_info.is_preroll = false;
1216                 lock.lock();
1217                 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(); });
1218         }
1219
1220         if (master_card_is_output) {
1221                 handle_hotplugged_cards();
1222         } else if (cards[master_card_index].new_frames.empty()) {
1223                 // We were woken up, but not due to a new frame. Deal with it
1224                 // and then restart.
1225                 assert(cards[master_card_index].capture->get_disconnected());
1226                 handle_hotplugged_cards();
1227                 lock.unlock();
1228                 goto start;
1229         }
1230
1231         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1232                 CaptureCard *card = &cards[card_index];
1233                 if (card->new_frames.empty()) {  // Starvation.
1234                         ++card->metric_input_duped_frames;
1235 #ifdef HAVE_CEF
1236                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1237                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1238                                 // stream of frames, so we'll have to ask it to repaint the frame
1239                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1240                                 // trim the queue completely away, and cleared when we actually
1241                                 // get a new frame.)
1242                                 ((CEFCapture *)card->capture.get())->request_new_frame();
1243                         }
1244 #endif
1245                 } else {
1246                         new_frames[card_index] = move(card->new_frames.front());
1247                         has_new_frame[card_index] = true;
1248                         card->new_frames.pop_front();
1249                         card->new_frames_changed.notify_all();
1250                 }
1251         }
1252
1253         if (!master_card_is_output) {
1254                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1255                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1256                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1257         }
1258
1259         if (!output_frame_info.is_preroll) {
1260                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1261         }
1262
1263         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1264                 CaptureCard *card = &cards[card_index];
1265                 if (has_new_frame[card_index] &&
1266                     !input_card_is_master_clock(card_index, master_card_index) &&
1267                     !output_frame_info.is_preroll) {
1268                         card->queue_length_policy.update_policy(
1269                                 output_frame_info.frame_timestamp,
1270                                 card->jitter_history.get_expected_next_frame(),
1271                                 new_frames[master_card_index].length,
1272                                 output_frame_info.frame_duration,
1273                                 card->jitter_history.estimate_max_jitter(),
1274                                 output_jitter_history.estimate_max_jitter());
1275                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1276                                                   card->queue_length_policy.get_safe_queue_length()));
1277                 }
1278         }
1279
1280         // This might get off by a fractional sample when changing master card
1281         // between ones with different frame rates, but that's fine.
1282         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1283         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1284         fractional_samples = num_samples_times_timebase % TIMEBASE;
1285         assert(output_frame_info.num_samples >= 0);
1286
1287         return output_frame_info;
1288 }
1289
1290 void Mixer::handle_hotplugged_cards()
1291 {
1292         // Check for cards that have been disconnected since last frame.
1293         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1294                 CaptureCard *card = &cards[card_index];
1295                 if (card->capture->get_disconnected()) {
1296                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1297                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1298                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1299                         card->queue_length_policy.reset(card_index);
1300                         card->capture->start_bm_capture();
1301                 }
1302         }
1303
1304         // Check for cards that have been connected since last frame.
1305         vector<libusb_device *> hotplugged_cards_copy;
1306         {
1307                 lock_guard<mutex> lock(hotplug_mutex);
1308                 swap(hotplugged_cards, hotplugged_cards_copy);
1309         }
1310         for (libusb_device *new_dev : hotplugged_cards_copy) {
1311                 // Look for a fake capture card where we can stick this in.
1312                 int free_card_index = -1;
1313                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1314                         if (cards[card_index].is_fake_capture) {
1315                                 free_card_index = card_index;
1316                                 break;
1317                         }
1318                 }
1319
1320                 if (free_card_index == -1) {
1321                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1322                         libusb_unref_device(new_dev);
1323                 } else {
1324                         // BMUSBCapture takes ownership.
1325                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1326                         CaptureCard *card = &cards[free_card_index];
1327                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1328                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1329                         card->queue_length_policy.reset(free_card_index);
1330                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1331                         capture->start_bm_capture();
1332                 }
1333         }
1334 }
1335
1336
1337 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)
1338 {
1339         // Resample the audio as needed, including from previously dropped frames.
1340         assert(num_cards > 0);
1341         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1342                 const bool dropped_frame = (frame_num != dropped_frames);
1343                 {
1344                         // Signal to the audio thread to process this frame.
1345                         // Note that if the frame is a dropped frame, we signal that
1346                         // we don't want to use this frame as base for adjusting
1347                         // the resampler rate. The reason for this is that the timing
1348                         // of these frames is often way too late; they typically don't
1349                         // “arrive” before we synthesize them. Thus, we could end up
1350                         // in a situation where we have inserted e.g. five audio frames
1351                         // into the queue before we then start pulling five of them
1352                         // back out. This makes ResamplingQueue overestimate the delay,
1353                         // causing undue resampler changes. (We _do_ use the last,
1354                         // non-dropped frame; perhaps we should just discard that as well,
1355                         // since dropped frames are expected to be rare, and it might be
1356                         // better to just wait until we have a slightly more normal situation).
1357                         lock_guard<mutex> lock(audio_mutex);
1358                         bool adjust_rate = !dropped_frame && !is_preroll;
1359                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1360                         audio_task_queue_changed.notify_one();
1361                 }
1362                 if (dropped_frame) {
1363                         // For dropped frames, increase the pts. Note that if the format changed
1364                         // in the meantime, we have no way of detecting that; we just have to
1365                         // assume the frame length is always the same.
1366                         pts_int += length_per_frame;
1367                 }
1368         }
1369 }
1370
1371 void Mixer::render_one_frame(int64_t duration)
1372 {
1373         // Determine the time code for this frame before we start rendering.
1374         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1375         if (display_timecode_on_stdout) {
1376                 printf("Timecode: '%s'\n", timecode_text.c_str());
1377         }
1378
1379         // Update Y'CbCr settings for all cards.
1380         {
1381                 lock_guard<mutex> lock(card_mutex);
1382                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1383                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1384                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1385                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1386                         input_state.full_range[card_index] = interpretation->full_range;
1387                 }
1388         }
1389
1390         // Get the main chain from the theme, and set its state immediately.
1391         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1392         EffectChain *chain = theme_main_chain.chain;
1393         theme_main_chain.setup_chain();
1394         //theme_main_chain.chain->enable_phase_timing(true);
1395
1396         // If HDMI/SDI output is active and the user has requested auto mode,
1397         // its mode overrides the existing Y'CbCr setting for the chain.
1398         YCbCrLumaCoefficients ycbcr_output_coefficients;
1399         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1400                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1401         } else {
1402                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1403         }
1404
1405         // TODO: Reduce the duplication against theme.cpp.
1406         YCbCrFormat output_ycbcr_format;
1407         output_ycbcr_format.chroma_subsampling_x = 1;
1408         output_ycbcr_format.chroma_subsampling_y = 1;
1409         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1410         output_ycbcr_format.full_range = false;
1411         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1412         chain->change_ycbcr_output_format(output_ycbcr_format);
1413
1414         // Render main chain. If we're using zerocopy Quick Sync encoding
1415         // (the default case), we take an extra copy of the created outputs,
1416         // so that we can display it back to the screen later (it's less memory
1417         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1418         // Ideally, we'd like to avoid taking copies and just use the main textures
1419         // for display as well, but they're just views into VA-API memory and must be
1420         // unmapped during encoding, so we can't use them for display, unfortunately.
1421         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1422         GLuint y_copy_tex, cbcr_copy_tex = 0;
1423         GLuint y_display_tex, cbcr_display_tex;
1424         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1425         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1426         const bool is_zerocopy = video_encoder->is_zerocopy();
1427         if (is_zerocopy) {
1428                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1429                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1430                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1431
1432                 y_display_tex = y_copy_tex;
1433                 cbcr_display_tex = cbcr_copy_tex;
1434
1435                 // y_tex and cbcr_tex will be given by VideoEncoder.
1436         } else {
1437                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1438                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1439                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1440
1441                 y_display_tex = y_tex;
1442                 cbcr_display_tex = cbcr_tex;
1443         }
1444
1445         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1446         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1447         assert(got_frame);
1448
1449         GLuint fbo;
1450         if (is_zerocopy) {
1451                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1452         } else {
1453                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1454         }
1455         check_error();
1456         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1457
1458         if (display_timecode_in_stream) {
1459                 // Render the timecode on top.
1460                 timecode_renderer->render_timecode(fbo, timecode_text);
1461         }
1462
1463         resource_pool->release_fbo(fbo);
1464
1465         if (is_zerocopy) {
1466                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1467         } else {
1468                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1469         }
1470         if (output_card_index != -1) {
1471                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1472         }
1473         resource_pool->release_2d_texture(cbcr_full_tex);
1474
1475         // Set the right state for the Y' and CbCr textures we use for display.
1476         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1477         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1478         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1479         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1480         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1481
1482         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1483         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1484         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1485         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1486
1487         RefCountedGLsync fence = video_encoder->end_frame();
1488
1489         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1490         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1491         DisplayFrame live_frame;
1492         live_frame.chain = display_chain.get();
1493         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1494                 display_input->set_texture_num(0, y_display_tex);
1495                 display_input->set_texture_num(1, cbcr_display_tex);
1496         };
1497         live_frame.ready_fence = fence;
1498         live_frame.input_frames = {};
1499         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1500         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1501
1502         // Set up preview and any additional channels.
1503         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1504                 DisplayFrame display_frame;
1505                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1506                 display_frame.chain = move(chain.chain);
1507                 display_frame.setup_chain = move(chain.setup_chain);
1508                 display_frame.ready_fence = fence;
1509                 display_frame.input_frames = move(chain.input_frames);
1510                 display_frame.temp_textures = {};
1511                 output_channel[i].output_frame(move(display_frame));
1512         }
1513 }
1514
1515 void Mixer::audio_thread_func()
1516 {
1517         pthread_setname_np(pthread_self(), "Mixer_Audio");
1518
1519         while (!should_quit) {
1520                 AudioTask task;
1521
1522                 {
1523                         unique_lock<mutex> lock(audio_mutex);
1524                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1525                         if (should_quit) {
1526                                 return;
1527                         }
1528                         task = audio_task_queue.front();
1529                         audio_task_queue.pop();
1530                 }
1531
1532                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1533                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1534                 vector<float> samples_out = audio_mixer->get_output(
1535                         task.frame_timestamp,
1536                         task.num_samples,
1537                         rate_adjustment_policy);
1538
1539                 // Send the samples to the sound card, then add them to the output.
1540                 if (alsa) {
1541                         alsa->write(samples_out);
1542                 }
1543                 if (output_card_index != -1) {
1544                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1545                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1546                 }
1547                 video_encoder->add_audio(task.pts_int, move(samples_out));
1548         }
1549 }
1550
1551 void Mixer::release_display_frame(DisplayFrame *frame)
1552 {
1553         for (GLuint texnum : frame->temp_textures) {
1554                 resource_pool->release_2d_texture(texnum);
1555         }
1556         frame->temp_textures.clear();
1557         frame->ready_fence.reset();
1558         frame->input_frames.clear();
1559 }
1560
1561 void Mixer::start()
1562 {
1563         mixer_thread = thread(&Mixer::thread_func, this);
1564         audio_thread = thread(&Mixer::audio_thread_func, this);
1565 }
1566
1567 void Mixer::quit()
1568 {
1569         should_quit = true;
1570         audio_task_queue_changed.notify_one();
1571         mixer_thread.join();
1572         audio_thread.join();
1573 }
1574
1575 void Mixer::transition_clicked(int transition_num)
1576 {
1577         theme->transition_clicked(transition_num, pts());
1578 }
1579
1580 void Mixer::channel_clicked(int preview_num)
1581 {
1582         theme->channel_clicked(preview_num);
1583 }
1584
1585 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1586 {
1587         lock_guard<mutex> lock(card_mutex);
1588         return ycbcr_interpretation[card_index];
1589 }
1590
1591 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1592 {
1593         lock_guard<mutex> lock(card_mutex);
1594         ycbcr_interpretation[card_index] = interpretation;
1595 }
1596
1597 void Mixer::start_mode_scanning(unsigned card_index)
1598 {
1599         assert(card_index < num_cards);
1600         if (is_mode_scanning[card_index]) {
1601                 return;
1602         }
1603         is_mode_scanning[card_index] = true;
1604         mode_scanlist[card_index].clear();
1605         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1606                 mode_scanlist[card_index].push_back(mode.first);
1607         }
1608         assert(!mode_scanlist[card_index].empty());
1609         mode_scanlist_index[card_index] = 0;
1610         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1611         last_mode_scan_change[card_index] = steady_clock::now();
1612 }
1613
1614 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1615 {
1616         assert(desired_output_card_index != -1);
1617         lock_guard<mutex> lock(card_mutex);
1618         return cards[desired_output_card_index].output->get_available_video_modes();
1619 }
1620
1621 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1622 {
1623         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1624         return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1625 }
1626
1627 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1628         assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1629         ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1630 }
1631
1632 void Mixer::wait_for_next_frame()
1633 {
1634         unique_lock<mutex> lock(frame_num_mutex);
1635         unsigned old_frame_num = frame_num;
1636         frame_num_updated.wait_for(lock, seconds(1),  // Timeout is just in case.
1637                 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1638 }
1639
1640 Mixer::OutputChannel::~OutputChannel()
1641 {
1642         if (has_current_frame) {
1643                 parent->release_display_frame(&current_frame);
1644         }
1645         if (has_ready_frame) {
1646                 parent->release_display_frame(&ready_frame);
1647         }
1648 }
1649
1650 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1651 {
1652         // Store this frame for display. Remove the ready frame if any
1653         // (it was seemingly never used).
1654         {
1655                 lock_guard<mutex> lock(frame_mutex);
1656                 if (has_ready_frame) {
1657                         parent->release_display_frame(&ready_frame);
1658                 }
1659                 ready_frame = move(frame);
1660                 has_ready_frame = true;
1661
1662                 // Call the callbacks under the mutex (they should be short),
1663                 // so that we don't race against a callback removal.
1664                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1665                         key_and_callback.second();
1666                 }
1667         }
1668
1669         // Reduce the number of callbacks by filtering duplicates. The reason
1670         // why we bother doing this is that Qt seemingly can get into a state
1671         // where its builds up an essentially unbounded queue of signals,
1672         // consuming more and more memory, and there's no good way of collapsing
1673         // user-defined signals or limiting the length of the queue.
1674         if (transition_names_updated_callback) {
1675                 vector<string> transition_names = global_mixer->get_transition_names();
1676                 bool changed = false;
1677                 if (transition_names.size() != last_transition_names.size()) {
1678                         changed = true;
1679                 } else {
1680                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1681                                 if (transition_names[i] != last_transition_names[i]) {
1682                                         changed = true;
1683                                         break;
1684                                 }
1685                         }
1686                 }
1687                 if (changed) {
1688                         transition_names_updated_callback(transition_names);
1689                         last_transition_names = transition_names;
1690                 }
1691         }
1692         if (name_updated_callback) {
1693                 string name = global_mixer->get_channel_name(channel);
1694                 if (name != last_name) {
1695                         name_updated_callback(name);
1696                         last_name = name;
1697                 }
1698         }
1699         if (color_updated_callback) {
1700                 string color = global_mixer->get_channel_color(channel);
1701                 if (color != last_color) {
1702                         color_updated_callback(color);
1703                         last_color = color;
1704                 }
1705         }
1706 }
1707
1708 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1709 {
1710         lock_guard<mutex> lock(frame_mutex);
1711         if (!has_current_frame && !has_ready_frame) {
1712                 return false;
1713         }
1714
1715         if (has_current_frame && has_ready_frame) {
1716                 // We have a new ready frame. Toss the current one.
1717                 parent->release_display_frame(&current_frame);
1718                 has_current_frame = false;
1719         }
1720         if (has_ready_frame) {
1721                 assert(!has_current_frame);
1722                 current_frame = move(ready_frame);
1723                 ready_frame.ready_fence.reset();  // Drop the refcount.
1724                 ready_frame.input_frames.clear();  // Drop the refcounts.
1725                 has_current_frame = true;
1726                 has_ready_frame = false;
1727         }
1728
1729         *frame = current_frame;
1730         return true;
1731 }
1732
1733 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1734 {
1735         lock_guard<mutex> lock(frame_mutex);
1736         new_frame_ready_callbacks[key] = callback;
1737 }
1738
1739 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1740 {
1741         lock_guard<mutex> lock(frame_mutex);
1742         new_frame_ready_callbacks.erase(key);
1743 }
1744
1745 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1746 {
1747         transition_names_updated_callback = callback;
1748 }
1749
1750 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1751 {
1752         name_updated_callback = callback;
1753 }
1754
1755 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1756 {
1757         color_updated_callback = callback;
1758 }
1759
1760 mutex RefCountedGLsync::fence_lock;