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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <epoxy/egl.h>
   7 #include <movit/effect_chain.h>
   8 #include <movit/effect_util.h>
   9 #include <movit/flat_input.h>
  10 #include <movit/image_format.h>
  11 #include <movit/init.h>
  12 #include <movit/resource_pool.h>
  13 #include <pthread.h>
  14 #include <stdint.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <algorithm>
  18 #include <chrono>
  19 #include <condition_variable>
  20 #include <cstddef>
  21 #include <cstdint>
  22 #include <memory>
  23 #include <mutex>
  24 #include <ratio>
  25 #include <string>
  26 #include <thread>
  27 #include <utility>
  28 #include <vector>
  29
  30 #include "DeckLinkAPI.h"
  31 #include "LinuxCOM.h"
  32 #include "alsa_output.h"
  33 #include "basic_stats.h"
  34 #include "bmusb/bmusb.h"
  35 #include "bmusb/fake_capture.h"
  36 #ifdef HAVE_CEF
  37 #include "cef_capture.h"
  38 #endif
  39 #include "chroma_subsampler.h"
  40 #include "context.h"
  41 #include "decklink_capture.h"
  42 #include "decklink_output.h"
  43 #include "defs.h"
  44 #include "disk_space_estimator.h"
  45 #include "ffmpeg_capture.h"
  46 #include "flags.h"
  47 #include "input_mapping.h"
  48 #include "metrics.h"
  49 #include "pbo_frame_allocator.h"
  50 #include "ref_counted_gl_sync.h"
  51 #include "resampling_queue.h"
  52 #include "timebase.h"
  53 #include "timecode_renderer.h"
  54 #include "v210_converter.h"
  55 #include "video_encoder.h"
  56
  57 #undef Status
  58 #include <google/protobuf/util/json_util.h>
  59 #include "json.pb.h"
  60
  61 class IDeckLink;
  62 class QOpenGLContext;
  63
  64 using namespace movit;
  65 using namespace std;
  66 using namespace std::chrono;
  67 using namespace std::placeholders;
  68 using namespace bmusb;
  69
  70 Mixer *global_mixer = nullptr;
  71
  72 namespace {
  73
  74 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  75 {
  76         if (interlaced) {
  77                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  78                         input_state->buffered_frames[card_index][frame_num] =
  79                                 input_state->buffered_frames[card_index][frame_num - 1];
  80                 }
  81                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  82         } else {
  83                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  84                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  85                 }
  86         }
  87 }
  88
  89 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
  90 {
  91         bool first;
  92         switch (userdata->pixel_format) {
  93         case PixelFormat_10BitYCbCr:
  94                 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
  95                 break;
  96         case PixelFormat_8BitYCbCr:
  97                 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
  98                 break;
  99         case PixelFormat_8BitBGRA:
 100                 first = userdata->tex_rgba[field] == 0;
 101                 break;
 102         case PixelFormat_8BitYCbCrPlanar:
 103                 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
 104                 break;
 105         default:
 106                 assert(false);
 107         }
 108
 109         if (first ||
 110             width != userdata->last_width[field] ||
 111             height != userdata->last_height[field] ||
 112             cbcr_width != userdata->last_cbcr_width[field] ||
 113             cbcr_height != userdata->last_cbcr_height[field]) {
 114                 // We changed resolution since last use of this texture, so we need to create
 115                 // a new object. Note that this each card has its own PBOFrameAllocator,
 116                 // we don't need to worry about these flip-flopping between resolutions.
 117                 switch (userdata->pixel_format) {
 118                 case PixelFormat_10BitYCbCr:
 119                         glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
 120                         check_error();
 121                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 122                         check_error();
 123                         break;
 124                 case PixelFormat_8BitYCbCr: {
 125                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 126                         check_error();
 127                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 128                         check_error();
 129                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 130                         check_error();
 131                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 132                         check_error();
 133                         break;
 134                 }
 135                 case PixelFormat_8BitYCbCrPlanar: {
 136                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 137                         check_error();
 138                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 139                         check_error();
 140                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
 141                         check_error();
 142                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 143                         check_error();
 144                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
 145                         check_error();
 146                         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 147                         check_error();
 148                         break;
 149                 }
 150                 case PixelFormat_8BitBGRA:
 151                         glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 152                         check_error();
 153                         if (global_flags.can_disable_srgb_decoder) {  // See the comments in tweaked_inputs.h.
 154                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 155                         } else {
 156                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
 157                         }
 158                         check_error();
 159                         break;
 160                 default:
 161                         assert(false);
 162                 }
 163                 userdata->last_width[field] = width;
 164                 userdata->last_height[field] = height;
 165                 userdata->last_cbcr_width[field] = cbcr_width;
 166                 userdata->last_cbcr_height[field] = cbcr_height;
 167         }
 168         if (global_flags.ten_bit_input &&
 169             (first || v210_width != userdata->last_v210_width[field])) {
 170                 // Same as above; we need to recreate the texture.
 171                 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
 172                 check_error();
 173                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
 174                 check_error();
 175                 userdata->last_v210_width[field] = v210_width;
 176         }
 177 }
 178
 179 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
 180 {
 181         if (interlaced_stride) {
 182                 stride *= 2;
 183         }
 184         if (global_flags.flush_pbos) {
 185                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
 186                 check_error();
 187         }
 188
 189         glBindTexture(GL_TEXTURE_2D, tex);
 190         check_error();
 191         if (interlaced_stride) {
 192                 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
 193                 check_error();
 194         } else {
 195                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 196                 check_error();
 197         }
 198
 199         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
 200         check_error();
 201         glBindTexture(GL_TEXTURE_2D, 0);
 202         check_error();
 203         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 204         check_error();
 205 }
 206
 207 }  // namespace
 208
 209 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
 210 {
 211         global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
 212         global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
 213 }
 214
 215 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
 216 {
 217         global_metrics.remove("input_underestimated_jitter_frames", labels);
 218         global_metrics.remove("input_estimated_max_jitter_seconds", labels);
 219 }
 220
 221 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
 222 {
 223         if (expected_timestamp > steady_clock::time_point::min()) {
 224                 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 225                 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
 226                 history.push_back(orders.insert(jitter_seconds));
 227                 if (jitter_seconds > estimate_max_jitter()) {
 228                         ++metric_input_underestimated_jitter_frames;
 229                 }
 230
 231                 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
 232
 233                 if (history.size() > history_length) {
 234                         orders.erase(history.front());
 235                         history.pop_front();
 236                 }
 237                 assert(history.size() <= history_length);
 238         }
 239         expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
 240 }
 241
 242 double JitterHistory::estimate_max_jitter() const
 243 {
 244         if (orders.empty()) {
 245                 return 0.0;
 246         }
 247         size_t elem_idx = lrint((orders.size() - 1) * percentile);
 248         if (percentile <= 0.5) {
 249                 return *next(orders.begin(), elem_idx) * multiplier;
 250         } else {
 251                 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
 252         }
 253 }
 254
 255 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
 256 {
 257         global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
 258 }
 259
 260 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
 261 {
 262         global_metrics.remove("input_queue_safe_length_frames", labels);
 263 }
 264
 265 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
 266                                       steady_clock::time_point expected_next_frame,
 267                                       int64_t input_frame_duration,
 268                                       int64_t master_frame_duration,
 269                                       double max_input_card_jitter_seconds,
 270                                       double max_master_card_jitter_seconds)
 271 {
 272         double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
 273         double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
 274
 275         // Figure out when we can expect the next frame for this card, assuming
 276         // worst-case jitter (ie., the frame is maximally late).
 277         double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
 278
 279         // How many times are the master card expected to tick in that time?
 280         // We assume the master clock has worst-case jitter but not any rate
 281         // discrepancy, ie., it ticks as early as possible every time, but not
 282         // cumulatively.
 283         double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
 284
 285         // As a special case, if the master card ticks faster than the input card,
 286         // we expect the queue to drain by itself even without dropping. But if
 287         // the difference is small (e.g. 60 Hz master and 59.94 input), it would
 288         // go slowly enough that the effect wouldn't really be appreciable.
 289         // We account for this by looking at the situation five frames ahead,
 290         // assuming everything else is the same.
 291         double frames_allowed;
 292         if (master_frame_duration < input_frame_duration) {
 293                 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
 294         } else {
 295                 frames_allowed = frames_needed;
 296         }
 297
 298         safe_queue_length = max<int>(floor(frames_allowed), 0);
 299         metric_input_queue_safe_length_frames = safe_queue_length;
 300 }
 301
 302 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 303         : httpd(),
 304           num_cards(num_cards),
 305           mixer_surface(create_surface(format)),
 306           h264_encoder_surface(create_surface(format)),
 307           decklink_output_surface(create_surface(format)),
 308           audio_mixer(num_cards)
 309 {
 310         memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
 311         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 312         check_error();
 313
 314         // This nearly always should be true.
 315         global_flags.can_disable_srgb_decoder =
 316                 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
 317                 epoxy_has_gl_extension("GL_ARB_sampler_objects");
 318
 319         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 320         // will be halved when sampling them, and we need to compensate here.
 321         movit_texel_subpixel_precision /= 2.0;
 322
 323         resource_pool.reset(new ResourcePool);
 324         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 325                 output_channel[i].parent = this;
 326                 output_channel[i].channel = i;
 327         }
 328
 329         ImageFormat inout_format;
 330         inout_format.color_space = COLORSPACE_sRGB;
 331         inout_format.gamma_curve = GAMMA_sRGB;
 332
 333         // Matches the 4:2:0 format created by the main chain.
 334         YCbCrFormat ycbcr_format;
 335         ycbcr_format.chroma_subsampling_x = 2;
 336         ycbcr_format.chroma_subsampling_y = 2;
 337         if (global_flags.ycbcr_rec709_coefficients) {
 338                 ycbcr_format.luma_coefficients = YCBCR_REC_709;
 339         } else {
 340                 ycbcr_format.luma_coefficients = YCBCR_REC_601;
 341         }
 342         ycbcr_format.full_range = false;
 343         ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
 344         ycbcr_format.cb_x_position = 0.0f;
 345         ycbcr_format.cr_x_position = 0.0f;
 346         ycbcr_format.cb_y_position = 0.5f;
 347         ycbcr_format.cr_y_position = 0.5f;
 348
 349         // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
 350         display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
 351         check_error();
 352         GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 353         display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
 354         display_chain->add_input(display_input);
 355         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 356         display_chain->set_dither_bits(0);  // Don't bother.
 357         display_chain->finalize();
 358
 359         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));
 360
 361         // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
 362         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 363
 364         httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
 365         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
 366                 char url[256];
 367                 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
 368                 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
 369         }
 370
 371         // Start listening for clients only once VideoEncoder has written its header, if any.
 372         httpd.start(global_flags.http_port);
 373
 374         // First try initializing the then PCI devices, then USB, then
 375         // fill up with fake cards until we have the desired number of cards.
 376         unsigned num_pci_devices = 0;
 377         unsigned card_index = 0;
 378
 379         {
 380                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 381                 if (decklink_iterator != nullptr) {
 382                         for ( ; card_index < num_cards; ++card_index) {
 383                                 IDeckLink *decklink;
 384                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 385                                         break;
 386                                 }
 387
 388                                 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
 389                                 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
 390                                 if (!output->set_device(decklink)) {
 391                                         delete output;
 392                                         output = nullptr;
 393                                 }
 394                                 configure_card(card_index, capture, CardType::LIVE_CARD, output);
 395                                 ++num_pci_devices;
 396                         }
 397                         decklink_iterator->Release();
 398                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 399                 } else {
 400                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 401                 }
 402         }
 403
 404         unsigned num_usb_devices = BMUSBCapture::num_cards();
 405         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 406                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 407                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 408                 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
 409         }
 410         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 411
 412         unsigned num_fake_cards = 0;
 413         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 414                 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 415                 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
 416         }
 417
 418         if (num_fake_cards > 0) {
 419                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 420         }
 421
 422         // Initialize all video inputs the theme asked for. Note that these are
 423         // all put _after_ the regular cards, which stop at <num_cards> - 1.
 424         std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
 425         for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
 426                 if (card_index >= MAX_VIDEO_CARDS) {
 427                         fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
 428                         exit(1);
 429                 }
 430                 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
 431                 video_inputs[video_card_index]->set_card_index(card_index);
 432         }
 433         num_video_inputs = video_inputs.size();
 434
 435 #ifdef HAVE_CEF
 436         // Same, for HTML inputs.
 437         std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
 438         for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
 439                 if (card_index >= MAX_VIDEO_CARDS) {
 440                         fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
 441                         exit(1);
 442                 }
 443                 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
 444                 html_inputs[html_card_index]->set_card_index(card_index);
 445         }
 446         num_html_inputs = html_inputs.size();
 447 #endif
 448
 449         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 450         BMUSBCapture::start_bm_thread();
 451
 452         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 453                 cards[card_index].queue_length_policy.reset(card_index);
 454         }
 455
 456         chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
 457
 458         if (global_flags.ten_bit_input) {
 459                 if (!v210Converter::has_hardware_support()) {
 460                         fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
 461                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 462                         exit(1);
 463                 }
 464                 v210_converter.reset(new v210Converter());
 465
 466                 // These are all the widths listed in the Blackmagic SDK documentation
 467                 // (section 2.7.3, “Display Modes”).
 468                 v210_converter->precompile_shader(720);
 469                 v210_converter->precompile_shader(1280);
 470                 v210_converter->precompile_shader(1920);
 471                 v210_converter->precompile_shader(2048);
 472                 v210_converter->precompile_shader(3840);
 473                 v210_converter->precompile_shader(4096);
 474         }
 475         if (global_flags.ten_bit_output) {
 476                 if (!v210Converter::has_hardware_support()) {
 477                         fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
 478                         fprintf(stderr, "       (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
 479                         exit(1);
 480                 }
 481         }
 482
 483         timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
 484         display_timecode_in_stream = global_flags.display_timecode_in_stream;
 485         display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
 486
 487         if (global_flags.enable_alsa_output) {
 488                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 489         }
 490         if (global_flags.output_card != -1) {
 491                 desired_output_card_index = global_flags.output_card;
 492                 set_output_card_internal(global_flags.output_card);
 493         }
 494
 495         output_jitter_history.register_metrics({{ "card", "output" }});
 496 }
 497
 498 Mixer::~Mixer()
 499 {
 500         BMUSBCapture::stop_bm_thread();
 501
 502         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 503                 {
 504                         unique_lock<mutex> lock(card_mutex);
 505                         cards[card_index].should_quit = true;  // Unblock thread.
 506                         cards[card_index].new_frames_changed.notify_all();
 507                 }
 508                 cards[card_index].capture->stop_dequeue_thread();
 509                 if (cards[card_index].output) {
 510                         cards[card_index].output->end_output();
 511                         cards[card_index].output.reset();
 512                 }
 513         }
 514
 515         video_encoder.reset(nullptr);
 516 }
 517
 518 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
 519 {
 520         printf("Configuring card %d...\n", card_index);
 521
 522         CaptureCard *card = &cards[card_index];
 523         if (card->capture != nullptr) {
 524                 card->capture->stop_dequeue_thread();
 525         }
 526         card->capture.reset(capture);
 527         card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
 528         card->is_cef_capture = (card_type == CardType::CEF_INPUT);
 529         card->may_have_dropped_last_frame = false;
 530         card->type = card_type;
 531         if (card->output.get() != output) {
 532                 card->output.reset(output);
 533         }
 534
 535         PixelFormat pixel_format;
 536         if (card_type == CardType::FFMPEG_INPUT) {
 537                 pixel_format = capture->get_current_pixel_format();
 538         } else if (card_type == CardType::CEF_INPUT) {
 539                 pixel_format = PixelFormat_8BitBGRA;
 540         } else if (global_flags.ten_bit_input) {
 541                 pixel_format = PixelFormat_10BitYCbCr;
 542         } else {
 543                 pixel_format = PixelFormat_8BitYCbCr;
 544         }
 545
 546         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 547         if (card->frame_allocator == nullptr) {
 548                 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height));  // 8 MB.
 549         }
 550         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 551         if (card->surface == nullptr) {
 552                 card->surface = create_surface_with_same_format(mixer_surface);
 553         }
 554         while (!card->new_frames.empty()) card->new_frames.pop_front();
 555         card->last_timecode = -1;
 556         card->capture->set_pixel_format(pixel_format);
 557         card->capture->configure_card();
 558
 559         // NOTE: start_bm_capture() happens in thread_func().
 560
 561         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 562         audio_mixer.reset_resampler(device);
 563         audio_mixer.set_display_name(device, card->capture->get_description());
 564         audio_mixer.trigger_state_changed_callback();
 565
 566         // Unregister old metrics, if any.
 567         if (!card->labels.empty()) {
 568                 const vector<pair<string, string>> &labels = card->labels;
 569                 card->jitter_history.unregister_metrics(labels);
 570                 card->queue_length_policy.unregister_metrics(labels);
 571                 global_metrics.remove("input_received_frames", labels);
 572                 global_metrics.remove("input_dropped_frames_jitter", labels);
 573                 global_metrics.remove("input_dropped_frames_error", labels);
 574                 global_metrics.remove("input_dropped_frames_resets", labels);
 575                 global_metrics.remove("input_queue_length_frames", labels);
 576                 global_metrics.remove("input_queue_duped_frames", labels);
 577
 578                 global_metrics.remove("input_has_signal_bool", labels);
 579                 global_metrics.remove("input_is_connected_bool", labels);
 580                 global_metrics.remove("input_interlaced_bool", labels);
 581                 global_metrics.remove("input_width_pixels", labels);
 582                 global_metrics.remove("input_height_pixels", labels);
 583                 global_metrics.remove("input_frame_rate_nom", labels);
 584                 global_metrics.remove("input_frame_rate_den", labels);
 585                 global_metrics.remove("input_sample_rate_hz", labels);
 586         }
 587
 588         // Register metrics.
 589         vector<pair<string, string>> labels;
 590         char card_name[64];
 591         snprintf(card_name, sizeof(card_name), "%d", card_index);
 592         labels.emplace_back("card", card_name);
 593
 594         switch (card_type) {
 595         case CardType::LIVE_CARD:
 596                 labels.emplace_back("cardtype", "live");
 597                 break;
 598         case CardType::FAKE_CAPTURE:
 599                 labels.emplace_back("cardtype", "fake");
 600                 break;
 601         case CardType::FFMPEG_INPUT:
 602                 labels.emplace_back("cardtype", "ffmpeg");
 603                 break;
 604         case CardType::CEF_INPUT:
 605                 labels.emplace_back("cardtype", "cef");
 606                 break;
 607         default:
 608                 assert(false);
 609         }
 610         card->jitter_history.register_metrics(labels);
 611         card->queue_length_policy.register_metrics(labels);
 612         global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
 613         global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
 614         global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
 615         global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
 616         global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
 617         global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
 618
 619         global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
 620         global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
 621         global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
 622         global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
 623         global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
 624         global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
 625         global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
 626         global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
 627         card->labels = labels;
 628 }
 629
 630 void Mixer::set_output_card_internal(int card_index)
 631 {
 632         // We don't really need to take card_mutex, since we're in the mixer
 633         // thread and don't mess with any queues (which is the only thing that happens
 634         // from other threads), but it's probably the safest in the long run.
 635         unique_lock<mutex> lock(card_mutex);
 636         if (output_card_index != -1) {
 637                 // Switch the old card from output to input.
 638                 CaptureCard *old_card = &cards[output_card_index];
 639                 old_card->output->end_output();
 640
 641                 // Stop the fake card that we put into place.
 642                 // This needs to _not_ happen under the mutex, to avoid deadlock
 643                 // (delivering the last frame needs to take the mutex).
 644                 CaptureInterface *fake_capture = old_card->capture.get();
 645                 lock.unlock();
 646                 fake_capture->stop_dequeue_thread();
 647                 lock.lock();
 648                 old_card->capture = move(old_card->parked_capture);  // TODO: reset the metrics
 649                 old_card->is_fake_capture = false;
 650                 old_card->capture->start_bm_capture();
 651         }
 652         if (card_index != -1) {
 653                 CaptureCard *card = &cards[card_index];
 654                 CaptureInterface *capture = card->capture.get();
 655                 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
 656                 // several seconds to complete (blocking on DisableVideoInput);
 657                 // see if we can maybe do it asynchronously.
 658                 lock.unlock();
 659                 capture->stop_dequeue_thread();
 660                 lock.lock();
 661                 card->parked_capture = move(card->capture);
 662                 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 663                 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
 664                 card->queue_length_policy.reset(card_index);
 665                 card->capture->start_bm_capture();
 666                 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
 667                 card->output->start_output(desired_output_video_mode, pts_int);
 668         }
 669         output_card_index = card_index;
 670         output_jitter_history.clear();
 671 }
 672
 673 namespace {
 674
 675 int unwrap_timecode(uint16_t current_wrapped, int last)
 676 {
 677         uint16_t last_wrapped = last & 0xffff;
 678         if (current_wrapped > last_wrapped) {
 679                 return (last & ~0xffff) | current_wrapped;
 680         } else {
 681                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 682         }
 683 }
 684
 685 }  // namespace
 686
 687 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 688                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 689                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 690 {
 691         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 692         CaptureCard *card = &cards[card_index];
 693
 694         ++card->metric_input_received_frames;
 695         card->metric_input_has_signal_bool = video_format.has_signal;
 696         card->metric_input_is_connected_bool = video_format.is_connected;
 697         card->metric_input_interlaced_bool = video_format.interlaced;
 698         card->metric_input_width_pixels = video_format.width;
 699         card->metric_input_height_pixels = video_format.height;
 700         card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
 701         card->metric_input_frame_rate_den = video_format.frame_rate_den;
 702         card->metric_input_sample_rate_hz = audio_format.sample_rate;
 703
 704         if (is_mode_scanning[card_index]) {
 705                 if (video_format.has_signal) {
 706                         // Found a stable signal, so stop scanning.
 707                         is_mode_scanning[card_index] = false;
 708                 } else {
 709                         static constexpr double switch_time_s = 0.1;  // Should be enough time for the signal to stabilize.
 710                         steady_clock::time_point now = steady_clock::now();
 711                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 712                         if (sec_since_last_switch > switch_time_s) {
 713                                 // It isn't this mode; try the next one.
 714                                 mode_scanlist_index[card_index]++;
 715                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 716                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 717                                 last_mode_scan_change[card_index] = now;
 718                         }
 719                 }
 720         }
 721
 722         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 723         assert(frame_length > 0);
 724
 725         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;
 726         if (num_samples > OUTPUT_FREQUENCY / 10) {
 727                 printf("Card %d: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
 728                         card_index, int(audio_frame.len), int(audio_offset),
 729                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 730                 if (video_frame.owner) {
 731                         video_frame.owner->release_frame(video_frame);
 732                 }
 733                 if (audio_frame.owner) {
 734                         audio_frame.owner->release_frame(audio_frame);
 735                 }
 736                 return;
 737         }
 738
 739         int dropped_frames = 0;
 740         if (card->last_timecode != -1) {
 741                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 742         }
 743
 744         // Number of samples per frame if we need to insert silence.
 745         // (Could be nonintegral, but resampling will save us then.)
 746         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 747
 748         if (dropped_frames > MAX_FPS * 2) {
 749                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 750                         card_index, card->last_timecode, timecode);
 751                 audio_mixer.reset_resampler(device);
 752                 dropped_frames = 0;
 753                 ++card->metric_input_resets;
 754         } else if (dropped_frames > 0) {
 755                 // Insert silence as needed.
 756                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 757                         card_index, dropped_frames, timecode);
 758                 card->metric_input_dropped_frames_error += dropped_frames;
 759
 760                 bool success;
 761                 do {
 762                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 763                 } while (!success);
 764         }
 765
 766         if (num_samples > 0) {
 767                 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
 768         }
 769
 770         // Done with the audio, so release it.
 771         if (audio_frame.owner) {
 772                 audio_frame.owner->release_frame(audio_frame);
 773         }
 774
 775         card->last_timecode = timecode;
 776
 777         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 778
 779         size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
 780         size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
 781         if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
 782                 // The calculation above is wrong for planar Y'CbCr, so just override it.
 783                 assert(card->type == CardType::FFMPEG_INPUT);
 784                 assert(video_offset == 0);
 785                 expected_length = video_frame.len;
 786
 787                 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
 788                 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
 789                 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
 790                 cbcr_offset = video_format.width * video_format.height;
 791                 y_offset = 0;
 792         } else {
 793                 // All the other Y'CbCr formats are 4:2:2.
 794                 cbcr_width = video_format.width / 2;
 795                 cbcr_height = video_format.height;
 796                 cbcr_offset = video_offset / 2;
 797                 y_offset = video_frame.size / 2 + video_offset / 2;
 798         }
 799         if (video_frame.len - video_offset == 0 ||
 800             video_frame.len - video_offset != expected_length) {
 801                 if (video_frame.len != 0) {
 802                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 803                                 card_index, video_frame.len - video_offset, expected_length);
 804                 }
 805                 if (video_frame.owner) {
 806                         video_frame.owner->release_frame(video_frame);
 807                 }
 808
 809                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 810                 // so that pts can go up accordingly.
 811                 {
 812                         unique_lock<mutex> lock(card_mutex);
 813                         CaptureCard::NewFrame new_frame;
 814                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 815                         new_frame.length = frame_length;
 816                         new_frame.interlaced = false;
 817                         new_frame.dropped_frames = dropped_frames;
 818                         new_frame.received_timestamp = video_frame.received_timestamp;
 819                         card->new_frames.push_back(move(new_frame));
 820                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 821                 }
 822                 card->new_frames_changed.notify_all();
 823                 return;
 824         }
 825
 826         unsigned num_fields = video_format.interlaced ? 2 : 1;
 827         steady_clock::time_point frame_upload_start;
 828         bool interlaced_stride = false;
 829         if (video_format.interlaced) {
 830                 // Send the two fields along as separate frames; the other side will need to add
 831                 // a deinterlacer to actually get this right.
 832                 assert(video_format.height % 2 == 0);
 833                 video_format.height /= 2;
 834                 cbcr_height /= 2;
 835                 assert(frame_length % 2 == 0);
 836                 frame_length /= 2;
 837                 num_fields = 2;
 838                 if (video_format.second_field_start == 1) {
 839                         interlaced_stride = true;
 840                 }
 841                 frame_upload_start = steady_clock::now();
 842         }
 843         userdata->last_interlaced = video_format.interlaced;
 844         userdata->last_has_signal = video_format.has_signal;
 845         userdata->last_is_connected = video_format.is_connected;
 846         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 847         userdata->last_frame_rate_den = video_format.frame_rate_den;
 848         RefCountedFrame frame(video_frame);
 849
 850         // Upload the textures.
 851         for (unsigned field = 0; field < num_fields; ++field) {
 852                 // Put the actual texture upload in a lambda that is executed in the main thread.
 853                 // It is entirely possible to do this in the same thread (and it might even be
 854                 // faster, depending on the GPU and driver), but it appears to be trickling
 855                 // driver bugs very easily.
 856                 //
 857                 // Note that this means we must hold on to the actual frame data in <userdata>
 858                 // until the upload command is run, but we hold on to <frame> much longer than that
 859                 // (in fact, all the way until we no longer use the texture in rendering).
 860                 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
 861                         unsigned field_start_line;
 862                         if (field == 1) {
 863                                 field_start_line = video_format.second_field_start;
 864                         } else {
 865                                 field_start_line = video_format.extra_lines_top;
 866                         }
 867
 868                         // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
 869                         size_t v210_width = video_format.stride / sizeof(uint32_t);
 870                         ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
 871
 872                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
 873                         check_error();
 874
 875                         switch (userdata->pixel_format) {
 876                         case PixelFormat_10BitYCbCr: {
 877                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 878                                 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);
 879                                 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
 880                                 break;
 881                         }
 882                         case PixelFormat_8BitYCbCr: {
 883                                 size_t field_y_start = y_offset + video_format.width * field_start_line;
 884                                 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 885
 886                                 // Make up our own strides, since we are interleaving.
 887                                 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);
 888                                 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);
 889                                 break;
 890                         }
 891                         case PixelFormat_8BitYCbCrPlanar: {
 892                                 assert(field_start_line == 0);  // We don't really support interlaced here.
 893                                 size_t field_y_start = y_offset;
 894                                 size_t field_cb_start = cbcr_offset;
 895                                 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
 896
 897                                 // Make up our own strides, since we are interleaving.
 898                                 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);
 899                                 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
 900                                 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
 901                                 break;
 902                         }
 903                         case PixelFormat_8BitBGRA: {
 904                                 size_t field_start = video_offset + video_format.stride * field_start_line;
 905                                 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);
 906                                 // These could be asked to deliver mipmaps at any time.
 907                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
 908                                 check_error();
 909                                 glGenerateMipmap(GL_TEXTURE_2D);
 910                                 check_error();
 911                                 glBindTexture(GL_TEXTURE_2D, 0);
 912                                 check_error();
 913                                 break;
 914                         }
 915                         default:
 916                                 assert(false);
 917                         }
 918
 919                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 920                         check_error();
 921                 };
 922
 923                 if (field == 1) {
 924                         // Don't upload the second field as fast as we can; wait until
 925                         // the field time has approximately passed. (Otherwise, we could
 926                         // get timing jitter against the other sources, and possibly also
 927                         // against the video display, although the latter is not as critical.)
 928                         // This requires our system clock to be reasonably close to the
 929                         // video clock, but that's not an unreasonable assumption.
 930                         steady_clock::time_point second_field_start = frame_upload_start +
 931                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 932                         this_thread::sleep_until(second_field_start);
 933                 }
 934
 935                 {
 936                         unique_lock<mutex> lock(card_mutex);
 937                         CaptureCard::NewFrame new_frame;
 938                         new_frame.frame = frame;
 939                         new_frame.length = frame_length;
 940                         new_frame.field = field;
 941                         new_frame.interlaced = video_format.interlaced;
 942                         new_frame.upload_func = upload_func;
 943                         new_frame.dropped_frames = dropped_frames;
 944                         new_frame.received_timestamp = video_frame.received_timestamp;  // Ignore the audio timestamp.
 945                         card->new_frames.push_back(move(new_frame));
 946                         card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
 947                         card->may_have_dropped_last_frame = false;
 948                 }
 949                 card->new_frames_changed.notify_all();
 950         }
 951 }
 952
 953 void Mixer::bm_hotplug_add(libusb_device *dev)
 954 {
 955         lock_guard<mutex> lock(hotplug_mutex);
 956         hotplugged_cards.push_back(dev);
 957 }
 958
 959 void Mixer::bm_hotplug_remove(unsigned card_index)
 960 {
 961         cards[card_index].new_frames_changed.notify_all();
 962 }
 963
 964 void Mixer::thread_func()
 965 {
 966         pthread_setname_np(pthread_self(), "Mixer_OpenGL");
 967
 968         eglBindAPI(EGL_OPENGL_API);
 969         QOpenGLContext *context = create_context(mixer_surface);
 970         if (!make_current(context, mixer_surface)) {
 971                 printf("oops\n");
 972                 exit(1);
 973         }
 974
 975         // Start the actual capture. (We don't want to do it before we're actually ready
 976         // to process output frames.)
 977         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
 978                 if (int(card_index) != output_card_index) {
 979                         cards[card_index].capture->start_bm_capture();
 980                 }
 981         }
 982
 983         BasicStats basic_stats(/*verbose=*/true);
 984         int stats_dropped_frames = 0;
 985
 986         while (!should_quit) {
 987                 if (desired_output_card_index != output_card_index) {
 988                         set_output_card_internal(desired_output_card_index);
 989                 }
 990                 if (output_card_index != -1 &&
 991                     desired_output_video_mode != output_video_mode) {
 992                         DeckLinkOutput *output = cards[output_card_index].output.get();
 993                         output->end_output();
 994                         desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
 995                         output->start_output(desired_output_video_mode, pts_int);
 996                 }
 997
 998                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 999                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1000
1001                 bool master_card_is_output;
1002                 unsigned master_card_index;
1003                 if (output_card_index != -1) {
1004                         master_card_is_output = true;
1005                         master_card_index = output_card_index;
1006                 } else {
1007                         master_card_is_output = false;
1008                         master_card_index = theme->map_signal(master_clock_channel);
1009                         assert(master_card_index < num_cards);
1010                 }
1011
1012                 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1013                 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);
1014                 stats_dropped_frames += output_frame_info.dropped_frames;
1015
1016                 handle_hotplugged_cards();
1017
1018                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1019                         if (card_index == master_card_index || !has_new_frame[card_index]) {
1020                                 continue;
1021                         }
1022                         if (new_frames[card_index].frame->len == 0) {
1023                                 ++new_frames[card_index].dropped_frames;
1024                         }
1025                         if (new_frames[card_index].dropped_frames > 0) {
1026                                 printf("Card %u dropped %d frames before this\n",
1027                                         card_index, int(new_frames[card_index].dropped_frames));
1028                         }
1029                 }
1030
1031                 // If the first card is reporting a corrupted or otherwise dropped frame,
1032                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1033                 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1034                         ++stats_dropped_frames;
1035                         pts_int += new_frames[master_card_index].length;
1036                         continue;
1037                 }
1038
1039                 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1040                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1041                                 continue;
1042
1043                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1044                         assert(new_frame->frame != nullptr);
1045                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1046                         check_error();
1047
1048                         // The new texture might need uploading before use.
1049                         if (new_frame->upload_func) {
1050                                 new_frame->upload_func();
1051                                 new_frame->upload_func = nullptr;
1052                         }
1053                 }
1054
1055                 int64_t frame_duration = output_frame_info.frame_duration;
1056                 render_one_frame(frame_duration);
1057                 ++frame_num;
1058                 pts_int += frame_duration;
1059
1060                 basic_stats.update(frame_num, stats_dropped_frames);
1061                 // if (frame_num % 100 == 0) chain->print_phase_timing();
1062
1063                 if (should_cut.exchange(false)) {  // Test and clear.
1064                         video_encoder->do_cut(frame_num);
1065                 }
1066
1067 #if 0
1068                 // Reset every 100 frames, so that local variations in frame times
1069                 // (especially for the first few frames, when the shaders are
1070                 // compiled etc.) don't make it hard to measure for the entire
1071                 // remaining duration of the program.
1072                 if (frame == 10000) {
1073                         frame = 0;
1074                         start = now;
1075                 }
1076 #endif
1077                 check_error();
1078         }
1079
1080         resource_pool->clean_context();
1081 }
1082
1083 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1084 {
1085         if (output_card_index != -1) {
1086                 // The output card (ie., cards[output_card_index].output) is the master clock,
1087                 // so no input card (ie., cards[card_index].capture) is.
1088                 return false;
1089         }
1090         return (card_index == master_card_index);
1091 }
1092
1093 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1094 {
1095         // Count the number of frames in the queue, including any frames
1096         // we dropped. It's hard to know exactly how we should deal with
1097         // dropped (corrupted) input frames; they don't help our goal of
1098         // avoiding starvation, but they still add to the problem of latency.
1099         // Since dropped frames is going to mean a bump in the signal anyway,
1100         // we err on the side of having more stable latency instead.
1101         unsigned queue_length = 0;
1102         for (const CaptureCard::NewFrame &frame : card->new_frames) {
1103                 queue_length += frame.dropped_frames + 1;
1104         }
1105
1106         // If needed, drop frames until the queue is below the safe limit.
1107         // We prefer to drop from the head, because all else being equal,
1108         // we'd like more recent frames (less latency).
1109         unsigned dropped_frames = 0;
1110         while (queue_length > safe_queue_length) {
1111                 assert(!card->new_frames.empty());
1112                 assert(queue_length > card->new_frames.front().dropped_frames);
1113                 queue_length -= card->new_frames.front().dropped_frames;
1114
1115                 if (queue_length <= safe_queue_length) {
1116                         // No need to drop anything.
1117                         break;
1118                 }
1119
1120                 card->new_frames.pop_front();
1121                 card->new_frames_changed.notify_all();
1122                 --queue_length;
1123                 ++dropped_frames;
1124
1125                 if (queue_length == 0 && card->is_cef_capture) {
1126                         card->may_have_dropped_last_frame = true;
1127                 }
1128         }
1129
1130         card->metric_input_dropped_frames_jitter += dropped_frames;
1131         card->metric_input_queue_length_frames = queue_length;
1132
1133 #if 0
1134         if (dropped_frames > 0) {
1135                 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1136                         card_index, dropped_frames);
1137         }
1138 #endif
1139 }
1140
1141 pair<string, string> Mixer::get_channels_json()
1142 {
1143         Channels ret;
1144         for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1145                 Channel *channel = ret.add_channel();
1146                 channel->set_index(channel_idx);
1147                 channel->set_name(theme->get_channel_name(channel_idx));
1148                 channel->set_color(theme->get_channel_color(channel_idx));
1149         }
1150         string contents;
1151         google::protobuf::util::MessageToJsonString(ret, &contents);  // Ignore any errors.
1152         return make_pair(contents, "text/json");
1153 }
1154
1155 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1156 {
1157         return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1158 }
1159
1160 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])
1161 {
1162         OutputFrameInfo output_frame_info;
1163 start:
1164         unique_lock<mutex> lock(card_mutex, defer_lock);
1165         if (master_card_is_output) {
1166                 // Clocked to the output, so wait for it to be ready for the next frame.
1167                 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);
1168                 lock.lock();
1169         } else {
1170                 // Wait for the master card to have a new frame.
1171                 // TODO: Add a timeout.
1172                 output_frame_info.is_preroll = false;
1173                 lock.lock();
1174                 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(); });
1175         }
1176
1177         if (master_card_is_output) {
1178                 handle_hotplugged_cards();
1179         } else if (cards[master_card_index].new_frames.empty()) {
1180                 // We were woken up, but not due to a new frame. Deal with it
1181                 // and then restart.
1182                 assert(cards[master_card_index].capture->get_disconnected());
1183                 handle_hotplugged_cards();
1184                 lock.unlock();
1185                 goto start;
1186         }
1187
1188         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1189                 CaptureCard *card = &cards[card_index];
1190                 if (card->new_frames.empty()) {  // Starvation.
1191                         ++card->metric_input_duped_frames;
1192 #ifdef HAVE_CEF
1193                         if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1194                                 // Unlike other sources, CEF is not guaranteed to send us a steady
1195                                 // stream of frames, so we'll have to ask it to repaint the frame
1196                                 // we dropped. (may_have_dropped_last_frame is set whenever we
1197                                 // trim the queue completely away, and cleared when we actually
1198                                 // get a new frame.)
1199                                 ((CEFCapture *)card->capture.get())->request_new_frame();
1200                         }
1201 #endif
1202                 } else {
1203                         new_frames[card_index] = move(card->new_frames.front());
1204                         has_new_frame[card_index] = true;
1205                         card->new_frames.pop_front();
1206                         card->new_frames_changed.notify_all();
1207                 }
1208         }
1209
1210         if (!master_card_is_output) {
1211                 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1212                 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1213                 output_frame_info.frame_duration = new_frames[master_card_index].length;
1214         }
1215
1216         if (!output_frame_info.is_preroll) {
1217                 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1218         }
1219
1220         for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1221                 CaptureCard *card = &cards[card_index];
1222                 if (has_new_frame[card_index] &&
1223                     !input_card_is_master_clock(card_index, master_card_index) &&
1224                     !output_frame_info.is_preroll) {
1225                         card->queue_length_policy.update_policy(
1226                                 output_frame_info.frame_timestamp,
1227                                 card->jitter_history.get_expected_next_frame(),
1228                                 new_frames[master_card_index].length,
1229                                 output_frame_info.frame_duration,
1230                                 card->jitter_history.estimate_max_jitter(),
1231                                 output_jitter_history.estimate_max_jitter());
1232                         trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1233                                                   card->queue_length_policy.get_safe_queue_length()));
1234                 }
1235         }
1236
1237         // This might get off by a fractional sample when changing master card
1238         // between ones with different frame rates, but that's fine.
1239         int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1240         output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1241         fractional_samples = num_samples_times_timebase % TIMEBASE;
1242         assert(output_frame_info.num_samples >= 0);
1243
1244         return output_frame_info;
1245 }
1246
1247 void Mixer::handle_hotplugged_cards()
1248 {
1249         // Check for cards that have been disconnected since last frame.
1250         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1251                 CaptureCard *card = &cards[card_index];
1252                 if (card->capture->get_disconnected()) {
1253                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1254                         FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1255                         configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1256                         card->queue_length_policy.reset(card_index);
1257                         card->capture->start_bm_capture();
1258                 }
1259         }
1260
1261         // Check for cards that have been connected since last frame.
1262         vector<libusb_device *> hotplugged_cards_copy;
1263         {
1264                 lock_guard<mutex> lock(hotplug_mutex);
1265                 swap(hotplugged_cards, hotplugged_cards_copy);
1266         }
1267         for (libusb_device *new_dev : hotplugged_cards_copy) {
1268                 // Look for a fake capture card where we can stick this in.
1269                 int free_card_index = -1;
1270                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1271                         if (cards[card_index].is_fake_capture) {
1272                                 free_card_index = card_index;
1273                                 break;
1274                         }
1275                 }
1276
1277                 if (free_card_index == -1) {
1278                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1279                         libusb_unref_device(new_dev);
1280                 } else {
1281                         // BMUSBCapture takes ownership.
1282                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1283                         CaptureCard *card = &cards[free_card_index];
1284                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1285                         configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1286                         card->queue_length_policy.reset(free_card_index);
1287                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1288                         capture->start_bm_capture();
1289                 }
1290         }
1291 }
1292
1293
1294 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)
1295 {
1296         // Resample the audio as needed, including from previously dropped frames.
1297         assert(num_cards > 0);
1298         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1299                 const bool dropped_frame = (frame_num != dropped_frames);
1300                 {
1301                         // Signal to the audio thread to process this frame.
1302                         // Note that if the frame is a dropped frame, we signal that
1303                         // we don't want to use this frame as base for adjusting
1304                         // the resampler rate. The reason for this is that the timing
1305                         // of these frames is often way too late; they typically don't
1306                         // “arrive” before we synthesize them. Thus, we could end up
1307                         // in a situation where we have inserted e.g. five audio frames
1308                         // into the queue before we then start pulling five of them
1309                         // back out. This makes ResamplingQueue overestimate the delay,
1310                         // causing undue resampler changes. (We _do_ use the last,
1311                         // non-dropped frame; perhaps we should just discard that as well,
1312                         // since dropped frames are expected to be rare, and it might be
1313                         // better to just wait until we have a slightly more normal situation).
1314                         unique_lock<mutex> lock(audio_mutex);
1315                         bool adjust_rate = !dropped_frame && !is_preroll;
1316                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1317                         audio_task_queue_changed.notify_one();
1318                 }
1319                 if (dropped_frame) {
1320                         // For dropped frames, increase the pts. Note that if the format changed
1321                         // in the meantime, we have no way of detecting that; we just have to
1322                         // assume the frame length is always the same.
1323                         pts_int += length_per_frame;
1324                 }
1325         }
1326 }
1327
1328 void Mixer::render_one_frame(int64_t duration)
1329 {
1330         // Determine the time code for this frame before we start rendering.
1331         string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1332         if (display_timecode_on_stdout) {
1333                 printf("Timecode: '%s'\n", timecode_text.c_str());
1334         }
1335
1336         // Update Y'CbCr settings for all cards.
1337         {
1338                 unique_lock<mutex> lock(card_mutex);
1339                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1340                         YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1341                         input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1342                         input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1343                         input_state.full_range[card_index] = interpretation->full_range;
1344                 }
1345         }
1346
1347         // Get the main chain from the theme, and set its state immediately.
1348         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1349         EffectChain *chain = theme_main_chain.chain;
1350         theme_main_chain.setup_chain();
1351         //theme_main_chain.chain->enable_phase_timing(true);
1352
1353         // The theme can't (or at least shouldn't!) call connect_signal() on
1354         // each FFmpeg or CEF input, so we'll do it here.
1355         for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_video_signal_connections()) {
1356                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1357         }
1358 #ifdef HAVE_CEF
1359         for (const pair<LiveInputWrapper *, CEFCapture *> &conn : theme->get_html_signal_connections()) {
1360                 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1361         }
1362 #endif
1363
1364         // If HDMI/SDI output is active and the user has requested auto mode,
1365         // its mode overrides the existing Y'CbCr setting for the chain.
1366         YCbCrLumaCoefficients ycbcr_output_coefficients;
1367         if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1368                 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1369         } else {
1370                 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1371         }
1372
1373         // TODO: Reduce the duplication against theme.cpp.
1374         YCbCrFormat output_ycbcr_format;
1375         output_ycbcr_format.chroma_subsampling_x = 1;
1376         output_ycbcr_format.chroma_subsampling_y = 1;
1377         output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1378         output_ycbcr_format.full_range = false;
1379         output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1380         chain->change_ycbcr_output_format(output_ycbcr_format);
1381
1382         // Render main chain. If we're using zerocopy Quick Sync encoding
1383         // (the default case), we take an extra copy of the created outputs,
1384         // so that we can display it back to the screen later (it's less memory
1385         // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1386         // Ideally, we'd like to avoid taking copies and just use the main textures
1387         // for display as well, but they're just views into VA-API memory and must be
1388         // unmapped during encoding, so we can't use them for display, unfortunately.
1389         GLuint y_tex, cbcr_full_tex, cbcr_tex;
1390         GLuint y_copy_tex, cbcr_copy_tex = 0;
1391         GLuint y_display_tex, cbcr_display_tex;
1392         GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1393         GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1394         const bool is_zerocopy = video_encoder->is_zerocopy();
1395         if (is_zerocopy) {
1396                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1397                 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1398                 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1399
1400                 y_display_tex = y_copy_tex;
1401                 cbcr_display_tex = cbcr_copy_tex;
1402
1403                 // y_tex and cbcr_tex will be given by VideoEncoder.
1404         } else {
1405                 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1406                 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1407                 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1408
1409                 y_display_tex = y_tex;
1410                 cbcr_display_tex = cbcr_tex;
1411         }
1412
1413         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1414         bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1415         assert(got_frame);
1416
1417         GLuint fbo;
1418         if (is_zerocopy) {
1419                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1420         } else {
1421                 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1422         }
1423         check_error();
1424         chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1425
1426         if (display_timecode_in_stream) {
1427                 // Render the timecode on top.
1428                 timecode_renderer->render_timecode(fbo, timecode_text);
1429         }
1430
1431         resource_pool->release_fbo(fbo);
1432
1433         if (is_zerocopy) {
1434                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1435         } else {
1436                 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1437         }
1438         if (output_card_index != -1) {
1439                 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1440         }
1441         resource_pool->release_2d_texture(cbcr_full_tex);
1442
1443         // Set the right state for the Y' and CbCr textures we use for display.
1444         glBindFramebuffer(GL_FRAMEBUFFER, 0);
1445         glBindTexture(GL_TEXTURE_2D, y_display_tex);
1446         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1447         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1448         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1449
1450         glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1451         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1452         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1453         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1454
1455         RefCountedGLsync fence = video_encoder->end_frame();
1456
1457         // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1458         // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1459         DisplayFrame live_frame;
1460         live_frame.chain = display_chain.get();
1461         live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1462                 display_input->set_texture_num(0, y_display_tex);
1463                 display_input->set_texture_num(1, cbcr_display_tex);
1464         };
1465         live_frame.ready_fence = fence;
1466         live_frame.input_frames = {};
1467         live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1468         output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1469
1470         // Set up preview and any additional channels.
1471         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1472                 DisplayFrame display_frame;
1473                 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state);  // FIXME: dimensions
1474                 display_frame.chain = move(chain.chain);
1475                 display_frame.setup_chain = move(chain.setup_chain);
1476                 display_frame.ready_fence = fence;
1477                 display_frame.input_frames = move(chain.input_frames);
1478                 display_frame.temp_textures = {};
1479                 output_channel[i].output_frame(move(display_frame));
1480         }
1481 }
1482
1483 void Mixer::audio_thread_func()
1484 {
1485         pthread_setname_np(pthread_self(), "Mixer_Audio");
1486
1487         while (!should_quit) {
1488                 AudioTask task;
1489
1490                 {
1491                         unique_lock<mutex> lock(audio_mutex);
1492                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1493                         if (should_quit) {
1494                                 return;
1495                         }
1496                         task = audio_task_queue.front();
1497                         audio_task_queue.pop();
1498                 }
1499
1500                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1501                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1502                 vector<float> samples_out = audio_mixer.get_output(
1503                         task.frame_timestamp,
1504                         task.num_samples,
1505                         rate_adjustment_policy);
1506
1507                 // Send the samples to the sound card, then add them to the output.
1508                 if (alsa) {
1509                         alsa->write(samples_out);
1510                 }
1511                 if (output_card_index != -1) {
1512                         const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE);  // Corresponds to the delay in ResamplingQueue.
1513                         cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1514                 }
1515                 video_encoder->add_audio(task.pts_int, move(samples_out));
1516         }
1517 }
1518
1519 void Mixer::release_display_frame(DisplayFrame *frame)
1520 {
1521         for (GLuint texnum : frame->temp_textures) {
1522                 resource_pool->release_2d_texture(texnum);
1523         }
1524         frame->temp_textures.clear();
1525         frame->ready_fence.reset();
1526         frame->input_frames.clear();
1527 }
1528
1529 void Mixer::start()
1530 {
1531         mixer_thread = thread(&Mixer::thread_func, this);
1532         audio_thread = thread(&Mixer::audio_thread_func, this);
1533 }
1534
1535 void Mixer::quit()
1536 {
1537         should_quit = true;
1538         audio_task_queue_changed.notify_one();
1539         mixer_thread.join();
1540         audio_thread.join();
1541 }
1542
1543 void Mixer::transition_clicked(int transition_num)
1544 {
1545         theme->transition_clicked(transition_num, pts());
1546 }
1547
1548 void Mixer::channel_clicked(int preview_num)
1549 {
1550         theme->channel_clicked(preview_num);
1551 }
1552
1553 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1554 {
1555         unique_lock<mutex> lock(card_mutex);
1556         return ycbcr_interpretation[card_index];
1557 }
1558
1559 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1560 {
1561         unique_lock<mutex> lock(card_mutex);
1562         ycbcr_interpretation[card_index] = interpretation;
1563 }
1564
1565 void Mixer::start_mode_scanning(unsigned card_index)
1566 {
1567         assert(card_index < num_cards);
1568         if (is_mode_scanning[card_index]) {
1569                 return;
1570         }
1571         is_mode_scanning[card_index] = true;
1572         mode_scanlist[card_index].clear();
1573         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1574                 mode_scanlist[card_index].push_back(mode.first);
1575         }
1576         assert(!mode_scanlist[card_index].empty());
1577         mode_scanlist_index[card_index] = 0;
1578         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1579         last_mode_scan_change[card_index] = steady_clock::now();
1580 }
1581
1582 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1583 {
1584         assert(desired_output_card_index != -1);
1585         unique_lock<mutex> lock(card_mutex);
1586         return cards[desired_output_card_index].output->get_available_video_modes();
1587 }
1588
1589 Mixer::OutputChannel::~OutputChannel()
1590 {
1591         if (has_current_frame) {
1592                 parent->release_display_frame(&current_frame);
1593         }
1594         if (has_ready_frame) {
1595                 parent->release_display_frame(&ready_frame);
1596         }
1597 }
1598
1599 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1600 {
1601         // Store this frame for display. Remove the ready frame if any
1602         // (it was seemingly never used).
1603         {
1604                 unique_lock<mutex> lock(frame_mutex);
1605                 if (has_ready_frame) {
1606                         parent->release_display_frame(&ready_frame);
1607                 }
1608                 ready_frame = move(frame);
1609                 has_ready_frame = true;
1610
1611                 // Call the callbacks under the mutex (they should be short),
1612                 // so that we don't race against a callback removal.
1613                 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1614                         key_and_callback.second();
1615                 }
1616         }
1617
1618         // Reduce the number of callbacks by filtering duplicates. The reason
1619         // why we bother doing this is that Qt seemingly can get into a state
1620         // where its builds up an essentially unbounded queue of signals,
1621         // consuming more and more memory, and there's no good way of collapsing
1622         // user-defined signals or limiting the length of the queue.
1623         if (transition_names_updated_callback) {
1624                 vector<string> transition_names = global_mixer->get_transition_names();
1625                 bool changed = false;
1626                 if (transition_names.size() != last_transition_names.size()) {
1627                         changed = true;
1628                 } else {
1629                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1630                                 if (transition_names[i] != last_transition_names[i]) {
1631                                         changed = true;
1632                                         break;
1633                                 }
1634                         }
1635                 }
1636                 if (changed) {
1637                         transition_names_updated_callback(transition_names);
1638                         last_transition_names = transition_names;
1639                 }
1640         }
1641         if (name_updated_callback) {
1642                 string name = global_mixer->get_channel_name(channel);
1643                 if (name != last_name) {
1644                         name_updated_callback(name);
1645                         last_name = name;
1646                 }
1647         }
1648         if (color_updated_callback) {
1649                 string color = global_mixer->get_channel_color(channel);
1650                 if (color != last_color) {
1651                         color_updated_callback(color);
1652                         last_color = color;
1653                 }
1654         }
1655 }
1656
1657 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1658 {
1659         unique_lock<mutex> lock(frame_mutex);
1660         if (!has_current_frame && !has_ready_frame) {
1661                 return false;
1662         }
1663
1664         if (has_current_frame && has_ready_frame) {
1665                 // We have a new ready frame. Toss the current one.
1666                 parent->release_display_frame(&current_frame);
1667                 has_current_frame = false;
1668         }
1669         if (has_ready_frame) {
1670                 assert(!has_current_frame);
1671                 current_frame = move(ready_frame);
1672                 ready_frame.ready_fence.reset();  // Drop the refcount.
1673                 ready_frame.input_frames.clear();  // Drop the refcounts.
1674                 has_current_frame = true;
1675                 has_ready_frame = false;
1676         }
1677
1678         *frame = current_frame;
1679         return true;
1680 }
1681
1682 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1683 {
1684         unique_lock<mutex> lock(frame_mutex);
1685         new_frame_ready_callbacks[key] = callback;
1686 }
1687
1688 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1689 {
1690         unique_lock<mutex> lock(frame_mutex);
1691         new_frame_ready_callbacks.erase(key);
1692 }
1693
1694 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1695 {
1696         transition_names_updated_callback = callback;
1697 }
1698
1699 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1700 {
1701         name_updated_callback = callback;
1702 }
1703
1704 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1705 {
1706         color_updated_callback = callback;
1707 }
1708
1709 mutex RefCountedGLsync::fence_lock;