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

   1 #undef Success
   2
   3 #include "mixer.h"
   4
   5 #include <assert.h>
   6 #include <endian.h>
   7 #include <epoxy/egl.h>
   8 #include <movit/effect_chain.h>
   9 #include <movit/effect_util.h>
  10 #include <movit/flat_input.h>
  11 #include <movit/image_format.h>
  12 #include <movit/init.h>
  13 #include <movit/resource_pool.h>
  14 #include <movit/util.h>
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <sys/resource.h>
  19 #include <sys/time.h>
  20 #include <time.h>
  21 #include <algorithm>
  22 #include <chrono>
  23 #include <cmath>
  24 #include <condition_variable>
  25 #include <cstddef>
  26 #include <memory>
  27 #include <mutex>
  28 #include <string>
  29 #include <thread>
  30 #include <utility>
  31 #include <vector>
  32
  33 #include "bmusb/bmusb.h"
  34 #include "bmusb/fake_capture.h"
  35 #include "context.h"
  36 #include "db.h"
  37 #include "decklink_capture.h"
  38 #include "defs.h"
  39 #include "disk_space_estimator.h"
  40 #include "flags.h"
  41 #include "pbo_frame_allocator.h"
  42 #include "ref_counted_gl_sync.h"
  43 #include "timebase.h"
  44 #include "video_encoder.h"
  45
  46 class QOpenGLContext;
  47
  48 using namespace movit;
  49 using namespace std;
  50 using namespace std::chrono;
  51 using namespace std::placeholders;
  52 using namespace bmusb;
  53
  54 Mixer *global_mixer = nullptr;
  55 bool uses_mlock = false;
  56
  57 namespace {
  58
  59 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
  60 {
  61         if (interlaced) {
  62                 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) {  // :-)
  63                         input_state->buffered_frames[card_index][frame_num] =
  64                                 input_state->buffered_frames[card_index][frame_num - 1];
  65                 }
  66                 input_state->buffered_frames[card_index][0] = { frame, field_num };
  67         } else {
  68                 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
  69                         input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
  70                 }
  71         }
  72 }
  73
  74 }  // namespace
  75
  76 void QueueLengthPolicy::update_policy(int queue_length)
  77 {
  78         if (queue_length < 0) {  // Starvation.
  79                 if (been_at_safe_point_since_last_starvation && safe_queue_length < 5) {
  80                         ++safe_queue_length;
  81                         fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frames\n",
  82                                 card_index, safe_queue_length);
  83                 }
  84                 frames_with_at_least_one = 0;
  85                 been_at_safe_point_since_last_starvation = false;
  86                 return;
  87         }
  88         if (queue_length > 0) {
  89                 if (queue_length >= int(safe_queue_length)) {
  90                         been_at_safe_point_since_last_starvation = true;
  91                 }
  92                 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 0) {
  93                         --safe_queue_length;
  94                         fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frames\n",
  95                                 card_index, safe_queue_length);
  96                         frames_with_at_least_one = 0;
  97                 }
  98         } else {
  99                 frames_with_at_least_one = 0;
 100         }
 101 }
 102
 103 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 104         : httpd(),
 105           num_cards(num_cards),
 106           mixer_surface(create_surface(format)),
 107           h264_encoder_surface(create_surface(format)),
 108           audio_mixer(num_cards)
 109 {
 110         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
 111         check_error();
 112
 113         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
 114         // will be halved when sampling them, and we need to compensate here.
 115         movit_texel_subpixel_precision /= 2.0;
 116
 117         resource_pool.reset(new ResourcePool);
 118         theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
 119         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
 120                 output_channel[i].parent = this;
 121                 output_channel[i].channel = i;
 122         }
 123
 124         ImageFormat inout_format;
 125         inout_format.color_space = COLORSPACE_sRGB;
 126         inout_format.gamma_curve = GAMMA_sRGB;
 127
 128         // Display chain; shows the live output produced by the main chain (its RGBA version).
 129         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
 130         check_error();
 131         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
 132         display_chain->add_input(display_input);
 133         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 134         display_chain->set_dither_bits(0);  // Don't bother.
 135         display_chain->finalize();
 136
 137         video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd, global_disk_space_estimator));
 138
 139         // Start listening for clients only once VideoEncoder has written its header, if any.
 140         httpd.start(9095);
 141
 142         // First try initializing the then PCI devices, then USB, then
 143         // fill up with fake cards until we have the desired number of cards.
 144         unsigned num_pci_devices = 0;
 145         unsigned card_index = 0;
 146
 147         {
 148                 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
 149                 if (decklink_iterator != nullptr) {
 150                         for ( ; card_index < num_cards; ++card_index) {
 151                                 IDeckLink *decklink;
 152                                 if (decklink_iterator->Next(&decklink) != S_OK) {
 153                                         break;
 154                                 }
 155
 156                                 configure_card(card_index, new DeckLinkCapture(decklink, card_index), /*is_fake_capture=*/false);
 157                                 ++num_pci_devices;
 158                         }
 159                         decklink_iterator->Release();
 160                         fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
 161                 } else {
 162                         fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
 163                 }
 164         }
 165         unsigned num_usb_devices = BMUSBCapture::num_cards();
 166         for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
 167                 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
 168                 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
 169                 configure_card(card_index, capture, /*is_fake_capture=*/false);
 170         }
 171         fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
 172
 173         unsigned num_fake_cards = 0;
 174         for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
 175                 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 176                 configure_card(card_index, capture, /*is_fake_capture=*/true);
 177         }
 178
 179         if (num_fake_cards > 0) {
 180                 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
 181         }
 182
 183         BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
 184         BMUSBCapture::start_bm_thread();
 185
 186         for (card_index = 0; card_index < num_cards; ++card_index) {
 187                 cards[card_index].queue_length_policy.reset(card_index);
 188                 cards[card_index].capture->start_bm_capture();
 189         }
 190
 191         // Set up stuff for NV12 conversion.
 192
 193         // Cb/Cr shader.
 194         string cbcr_vert_shader =
 195                 "#version 130 \n"
 196                 " \n"
 197                 "in vec2 position; \n"
 198                 "in vec2 texcoord; \n"
 199                 "out vec2 tc0; \n"
 200                 "uniform vec2 foo_chroma_offset_0; \n"
 201                 " \n"
 202                 "void main() \n"
 203                 "{ \n"
 204                 "    // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is: \n"
 205                 "    // \n"
 206                 "    //   2.000  0.000  0.000 -1.000 \n"
 207                 "    //   0.000  2.000  0.000 -1.000 \n"
 208                 "    //   0.000  0.000 -2.000 -1.000 \n"
 209                 "    //   0.000  0.000  0.000  1.000 \n"
 210                 "    gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
 211                 "    vec2 flipped_tc = texcoord; \n"
 212                 "    tc0 = flipped_tc + foo_chroma_offset_0; \n"
 213                 "} \n";
 214         string cbcr_frag_shader =
 215                 "#version 130 \n"
 216                 "in vec2 tc0; \n"
 217                 "uniform sampler2D cbcr_tex; \n"
 218                 "out vec4 FragColor; \n"
 219                 "void main() { \n"
 220                 "    FragColor = texture(cbcr_tex, tc0); \n"
 221                 "} \n";
 222         vector<string> frag_shader_outputs;
 223         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
 224
 225         float vertices[] = {
 226                 0.0f, 2.0f,
 227                 0.0f, 0.0f,
 228                 2.0f, 0.0f
 229         };
 230         cbcr_vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
 231         cbcr_position_attribute_index = glGetAttribLocation(cbcr_program_num, "position");
 232         cbcr_texcoord_attribute_index = glGetAttribLocation(cbcr_program_num, "texcoord");
 233
 234         if (global_flags.enable_alsa_output) {
 235                 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
 236         }
 237 }
 238
 239 Mixer::~Mixer()
 240 {
 241         resource_pool->release_glsl_program(cbcr_program_num);
 242         glDeleteBuffers(1, &cbcr_vbo);
 243         BMUSBCapture::stop_bm_thread();
 244
 245         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 246                 {
 247                         unique_lock<mutex> lock(bmusb_mutex);
 248                         cards[card_index].should_quit = true;  // Unblock thread.
 249                         cards[card_index].new_frames_changed.notify_all();
 250                 }
 251                 cards[card_index].capture->stop_dequeue_thread();
 252         }
 253
 254         video_encoder.reset(nullptr);
 255 }
 256
 257 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture)
 258 {
 259         printf("Configuring card %d...\n", card_index);
 260
 261         CaptureCard *card = &cards[card_index];
 262         if (card->capture != nullptr) {
 263                 card->capture->stop_dequeue_thread();
 264                 delete card->capture;
 265         }
 266         card->capture = capture;
 267         card->is_fake_capture = is_fake_capture;
 268         card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 269         if (card->frame_allocator == nullptr) {
 270                 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT));  // 8 MB.
 271         }
 272         card->capture->set_video_frame_allocator(card->frame_allocator.get());
 273         if (card->surface == nullptr) {
 274                 card->surface = create_surface_with_same_format(mixer_surface);
 275         }
 276         while (!card->new_frames.empty()) card->new_frames.pop();
 277         card->fractional_samples = 0;
 278         card->last_timecode = -1;
 279         card->capture->configure_card();
 280
 281         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 282         audio_mixer.reset_resampler(device);
 283         audio_mixer.set_name(device, card->capture->get_description());
 284 }
 285
 286
 287 namespace {
 288
 289 int unwrap_timecode(uint16_t current_wrapped, int last)
 290 {
 291         uint16_t last_wrapped = last & 0xffff;
 292         if (current_wrapped > last_wrapped) {
 293                 return (last & ~0xffff) | current_wrapped;
 294         } else {
 295                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 296         }
 297 }
 298
 299 }  // namespace
 300
 301 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 302                      FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
 303                      FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
 304 {
 305         DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
 306         CaptureCard *card = &cards[card_index];
 307
 308         if (is_mode_scanning[card_index]) {
 309                 if (video_format.has_signal) {
 310                         // Found a stable signal, so stop scanning.
 311                         is_mode_scanning[card_index] = false;
 312                 } else {
 313                         static constexpr double switch_time_s = 0.5;  // Should be enough time for the signal to stabilize.
 314                         steady_clock::time_point now = steady_clock::now();
 315                         double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
 316                         if (sec_since_last_switch > switch_time_s) {
 317                                 // It isn't this mode; try the next one.
 318                                 mode_scanlist_index[card_index]++;
 319                                 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
 320                                 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
 321                                 last_mode_scan_change[card_index] = now;
 322                         }
 323                 }
 324         }
 325
 326         int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
 327         assert(frame_length > 0);
 328
 329         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;
 330         if (num_samples > OUTPUT_FREQUENCY / 10) {
 331                 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",
 332                         card_index, int(audio_frame.len), int(audio_offset),
 333                         timecode, int(video_frame.len), int(video_offset), video_format.id);
 334                 if (video_frame.owner) {
 335                         video_frame.owner->release_frame(video_frame);
 336                 }
 337                 if (audio_frame.owner) {
 338                         audio_frame.owner->release_frame(audio_frame);
 339                 }
 340                 return;
 341         }
 342
 343         int dropped_frames = 0;
 344         if (card->last_timecode != -1) {
 345                 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
 346         }
 347
 348         // Number of samples per frame if we need to insert silence.
 349         // (Could be nonintegral, but resampling will save us then.)
 350         const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
 351
 352         if (dropped_frames > MAX_FPS * 2) {
 353                 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
 354                         card_index, card->last_timecode, timecode);
 355                 audio_mixer.reset_resampler(device);
 356                 dropped_frames = 0;
 357         } else if (dropped_frames > 0) {
 358                 // Insert silence as needed.
 359                 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 360                         card_index, dropped_frames, timecode);
 361
 362                 bool success;
 363                 do {
 364                         success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
 365                 } while (!success);
 366         }
 367
 368         audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
 369
 370         // Done with the audio, so release it.
 371         if (audio_frame.owner) {
 372                 audio_frame.owner->release_frame(audio_frame);
 373         }
 374
 375         card->last_timecode = timecode;
 376
 377         size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
 378         if (video_frame.len - video_offset == 0 ||
 379             video_frame.len - video_offset != expected_length) {
 380                 if (video_frame.len != 0) {
 381                         printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
 382                                 card_index, video_frame.len - video_offset, expected_length);
 383                 }
 384                 if (video_frame.owner) {
 385                         video_frame.owner->release_frame(video_frame);
 386                 }
 387
 388                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 389                 // so that pts can go up accordingly.
 390                 {
 391                         unique_lock<mutex> lock(bmusb_mutex);
 392                         CaptureCard::NewFrame new_frame;
 393                         new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
 394                         new_frame.length = frame_length;
 395                         new_frame.interlaced = false;
 396                         new_frame.dropped_frames = dropped_frames;
 397                         card->new_frames.push(move(new_frame));
 398                         card->new_frames_changed.notify_all();
 399                 }
 400                 return;
 401         }
 402
 403         PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
 404
 405         unsigned num_fields = video_format.interlaced ? 2 : 1;
 406         steady_clock::time_point frame_upload_start;
 407         if (video_format.interlaced) {
 408                 // Send the two fields along as separate frames; the other side will need to add
 409                 // a deinterlacer to actually get this right.
 410                 assert(video_format.height % 2 == 0);
 411                 video_format.height /= 2;
 412                 assert(frame_length % 2 == 0);
 413                 frame_length /= 2;
 414                 num_fields = 2;
 415                 frame_upload_start = steady_clock::now();
 416         }
 417         userdata->last_interlaced = video_format.interlaced;
 418         userdata->last_has_signal = video_format.has_signal;
 419         userdata->last_is_connected = video_format.is_connected;
 420         userdata->last_frame_rate_nom = video_format.frame_rate_nom;
 421         userdata->last_frame_rate_den = video_format.frame_rate_den;
 422         RefCountedFrame frame(video_frame);
 423
 424         // Upload the textures.
 425         size_t cbcr_width = video_format.width / 2;
 426         size_t cbcr_offset = video_offset / 2;
 427         size_t y_offset = video_frame.size / 2 + video_offset / 2;
 428
 429         for (unsigned field = 0; field < num_fields; ++field) {
 430                 // Put the actual texture upload in a lambda that is executed in the main thread.
 431                 // It is entirely possible to do this in the same thread (and it might even be
 432                 // faster, depending on the GPU and driver), but it appears to be trickling
 433                 // driver bugs very easily.
 434                 //
 435                 // Note that this means we must hold on to the actual frame data in <userdata>
 436                 // until the upload command is run, but we hold on to <frame> much longer than that
 437                 // (in fact, all the way until we no longer use the texture in rendering).
 438                 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
 439                         unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
 440
 441                         if (userdata->tex_y[field] == 0 ||
 442                             userdata->tex_cbcr[field] == 0 ||
 443                             video_format.width != userdata->last_width[field] ||
 444                             video_format.height != userdata->last_height[field]) {
 445                                 // We changed resolution since last use of this texture, so we need to create
 446                                 // a new object. Note that this each card has its own PBOFrameAllocator,
 447                                 // we don't need to worry about these flip-flopping between resolutions.
 448                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 449                                 check_error();
 450                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
 451                                 check_error();
 452                                 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 453                                 check_error();
 454                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
 455                                 check_error();
 456                                 userdata->last_width[field] = video_format.width;
 457                                 userdata->last_height[field] = video_format.height;
 458                         }
 459
 460                         GLuint pbo = userdata->pbo;
 461                         check_error();
 462                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
 463                         check_error();
 464
 465                         size_t field_y_start = y_offset + video_format.width * field_start_line;
 466                         size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
 467
 468                         if (global_flags.flush_pbos) {
 469                                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
 470                                 check_error();
 471                                 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
 472                                 check_error();
 473                         }
 474
 475                         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
 476                         check_error();
 477                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
 478                         check_error();
 479                         glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
 480                         check_error();
 481                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
 482                         check_error();
 483                         glBindTexture(GL_TEXTURE_2D, 0);
 484                         check_error();
 485                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 486                         check_error();
 487                 };
 488
 489                 if (field == 1) {
 490                         // Don't upload the second field as fast as we can; wait until
 491                         // the field time has approximately passed. (Otherwise, we could
 492                         // get timing jitter against the other sources, and possibly also
 493                         // against the video display, although the latter is not as critical.)
 494                         // This requires our system clock to be reasonably close to the
 495                         // video clock, but that's not an unreasonable assumption.
 496                         steady_clock::time_point second_field_start = frame_upload_start +
 497                                 nanoseconds(frame_length * 1000000000 / TIMEBASE);
 498                         this_thread::sleep_until(second_field_start);
 499                 }
 500
 501                 {
 502                         unique_lock<mutex> lock(bmusb_mutex);
 503                         CaptureCard::NewFrame new_frame;
 504                         new_frame.frame = frame;
 505                         new_frame.length = frame_length;
 506                         new_frame.field = field;
 507                         new_frame.interlaced = video_format.interlaced;
 508                         new_frame.upload_func = upload_func;
 509                         new_frame.dropped_frames = dropped_frames;
 510                         card->new_frames.push(move(new_frame));
 511                         card->new_frames_changed.notify_all();
 512                 }
 513         }
 514 }
 515
 516 void Mixer::bm_hotplug_add(libusb_device *dev)
 517 {
 518         lock_guard<mutex> lock(hotplug_mutex);
 519         hotplugged_cards.push_back(dev);
 520 }
 521
 522 void Mixer::bm_hotplug_remove(unsigned card_index)
 523 {
 524         cards[card_index].new_frames_changed.notify_all();
 525 }
 526
 527 void Mixer::thread_func()
 528 {
 529         eglBindAPI(EGL_OPENGL_API);
 530         QOpenGLContext *context = create_context(mixer_surface);
 531         if (!make_current(context, mixer_surface)) {
 532                 printf("oops\n");
 533                 exit(1);
 534         }
 535
 536         steady_clock::time_point start, now;
 537         start = steady_clock::now();
 538
 539         int frame = 0;
 540         int stats_dropped_frames = 0;
 541
 542         while (!should_quit) {
 543                 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
 544                 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
 545                 int num_samples[MAX_VIDEO_CARDS] = { 0 };
 546
 547                 unsigned master_card_index = theme->map_signal(master_clock_channel);
 548                 assert(master_card_index < num_cards);
 549
 550                 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
 551                 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
 552                 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
 553
 554                 handle_hotplugged_cards();
 555
 556                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 557                         if (card_index == master_card_index || !has_new_frame[card_index]) {
 558                                 continue;
 559                         }
 560                         if (new_frames[card_index].frame->len == 0) {
 561                                 ++new_frames[card_index].dropped_frames;
 562                         }
 563                         if (new_frames[card_index].dropped_frames > 0) {
 564                                 printf("Card %u dropped %d frames before this\n",
 565                                         card_index, int(new_frames[card_index].dropped_frames));
 566                         }
 567                 }
 568
 569                 // If the first card is reporting a corrupted or otherwise dropped frame,
 570                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 571                 if (new_frames[master_card_index].frame->len == 0) {
 572                         ++stats_dropped_frames;
 573                         pts_int += new_frames[master_card_index].length;
 574                         continue;
 575                 }
 576
 577                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 578                         if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
 579                                 continue;
 580
 581                         CaptureCard::NewFrame *new_frame = &new_frames[card_index];
 582                         assert(new_frame->frame != nullptr);
 583                         insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
 584                         check_error();
 585
 586                         // The new texture might need uploading before use.
 587                         if (new_frame->upload_func) {
 588                                 new_frame->upload_func();
 589                                 new_frame->upload_func = nullptr;
 590                         }
 591                 }
 592
 593                 int64_t frame_duration = new_frames[master_card_index].length;
 594                 render_one_frame(frame_duration);
 595                 ++frame;
 596                 pts_int += frame_duration;
 597
 598                 now = steady_clock::now();
 599                 double elapsed = duration<double>(now - start).count();
 600                 if (frame % 100 == 0) {
 601                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
 602                                 frame, stats_dropped_frames, elapsed, frame / elapsed,
 603                                 1e3 * elapsed / frame);
 604                 //      chain->print_phase_timing();
 605
 606                         // Check our memory usage, to see if we are close to our mlockall()
 607                         // limit (if at all set).
 608                         rusage used;
 609                         if (getrusage(RUSAGE_SELF, &used) == -1) {
 610                                 perror("getrusage(RUSAGE_SELF)");
 611                                 assert(false);
 612                         }
 613
 614                         if (uses_mlock) {
 615                                 rlimit limit;
 616                                 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
 617                                         perror("getrlimit(RLIMIT_MEMLOCK)");
 618                                         assert(false);
 619                                 }
 620
 621                                 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
 622                                         long(used.ru_maxrss / 1024),
 623                                         long(limit.rlim_cur / 1048576),
 624                                         float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
 625                         } else {
 626                                 printf(", using %ld MB memory (not locked)",
 627                                         long(used.ru_maxrss / 1024));
 628                         }
 629
 630                         printf("\n");
 631                 }
 632
 633
 634                 if (should_cut.exchange(false)) {  // Test and clear.
 635                         video_encoder->do_cut(frame);
 636                 }
 637
 638 #if 0
 639                 // Reset every 100 frames, so that local variations in frame times
 640                 // (especially for the first few frames, when the shaders are
 641                 // compiled etc.) don't make it hard to measure for the entire
 642                 // remaining duration of the program.
 643                 if (frame == 10000) {
 644                         frame = 0;
 645                         start = now;
 646                 }
 647 #endif
 648                 check_error();
 649         }
 650
 651         resource_pool->clean_context();
 652 }
 653
 654 void Mixer::get_one_frame_from_each_card(unsigned master_card_index, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS], int num_samples[MAX_VIDEO_CARDS])
 655 {
 656 start:
 657         // The first card is the master timer, so wait for it to have a new frame.
 658         // TODO: Add a timeout.
 659         unique_lock<mutex> lock(bmusb_mutex);
 660         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(); });
 661
 662         if (cards[master_card_index].new_frames.empty()) {
 663                 // We were woken up, but not due to a new frame. Deal with it
 664                 // and then restart.
 665                 assert(cards[master_card_index].capture->get_disconnected());
 666                 handle_hotplugged_cards();
 667                 goto start;
 668         }
 669
 670         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 671                 CaptureCard *card = &cards[card_index];
 672                 if (card->new_frames.empty()) {
 673                         assert(card_index != master_card_index);
 674                         card->queue_length_policy.update_policy(-1);
 675                         continue;
 676                 }
 677                 new_frames[card_index] = move(card->new_frames.front());
 678                 has_new_frame[card_index] = true;
 679                 card->new_frames.pop();
 680                 card->new_frames_changed.notify_all();
 681
 682                 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
 683                 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
 684                 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
 685                 assert(num_samples[card_index] >= 0);
 686
 687                 if (card_index == master_card_index) {
 688                         // We don't use the queue length policy for the master card,
 689                         // but we will if it stops being the master. Thus, clear out
 690                         // the policy in case we switch in the future.
 691                         card->queue_length_policy.reset(card_index);
 692                 } else {
 693                         // If we have excess frames compared to the policy for this card,
 694                         // drop frames from the head.
 695                         card->queue_length_policy.update_policy(card->new_frames.size());
 696                         while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
 697                                 card->new_frames.pop();
 698                         }
 699                 }
 700         }
 701 }
 702
 703 void Mixer::handle_hotplugged_cards()
 704 {
 705         // Check for cards that have been disconnected since last frame.
 706         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 707                 CaptureCard *card = &cards[card_index];
 708                 if (card->capture->get_disconnected()) {
 709                         fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
 710                         FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
 711                         configure_card(card_index, capture, /*is_fake_capture=*/true);
 712                         card->queue_length_policy.reset(card_index);
 713                         card->capture->start_bm_capture();
 714                 }
 715         }
 716
 717         // Check for cards that have been connected since last frame.
 718         vector<libusb_device *> hotplugged_cards_copy;
 719         {
 720                 lock_guard<mutex> lock(hotplug_mutex);
 721                 swap(hotplugged_cards, hotplugged_cards_copy);
 722         }
 723         for (libusb_device *new_dev : hotplugged_cards_copy) {
 724                 // Look for a fake capture card where we can stick this in.
 725                 int free_card_index = -1;
 726                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 727                         if (cards[card_index].is_fake_capture) {
 728                                 free_card_index = int(card_index);
 729                                 break;
 730                         }
 731                 }
 732
 733                 if (free_card_index == -1) {
 734                         fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
 735                         libusb_unref_device(new_dev);
 736                 } else {
 737                         // BMUSBCapture takes ownership.
 738                         fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
 739                         CaptureCard *card = &cards[free_card_index];
 740                         BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
 741                         configure_card(free_card_index, capture, /*is_fake_capture=*/false);
 742                         card->queue_length_policy.reset(free_card_index);
 743                         capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
 744                         capture->start_bm_capture();
 745                 }
 746         }
 747 }
 748
 749
 750 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
 751 {
 752         // Resample the audio as needed, including from previously dropped frames.
 753         assert(num_cards > 0);
 754         for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
 755                 const bool dropped_frame = (frame_num != dropped_frames);
 756                 {
 757                         // Signal to the audio thread to process this frame.
 758                         // Note that if the frame is a dropped frame, we signal that
 759                         // we don't want to use this frame as base for adjusting
 760                         // the resampler rate. The reason for this is that the timing
 761                         // of these frames is often way too late; they typically don't
 762                         // “arrive” before we synthesize them. Thus, we could end up
 763                         // in a situation where we have inserted e.g. five audio frames
 764                         // into the queue before we then start pulling five of them
 765                         // back out. This makes ResamplingQueue overestimate the delay,
 766                         // causing undue resampler changes. (We _do_ use the last,
 767                         // non-dropped frame; perhaps we should just discard that as well,
 768                         // since dropped frames are expected to be rare, and it might be
 769                         // better to just wait until we have a slightly more normal situation).
 770                         unique_lock<mutex> lock(audio_mutex);
 771                         bool adjust_rate = !dropped_frame;
 772                         audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
 773                         audio_task_queue_changed.notify_one();
 774                 }
 775                 if (dropped_frame) {
 776                         // For dropped frames, increase the pts. Note that if the format changed
 777                         // in the meantime, we have no way of detecting that; we just have to
 778                         // assume the frame length is always the same.
 779                         pts_int += length_per_frame;
 780                 }
 781         }
 782 }
 783
 784 void Mixer::render_one_frame(int64_t duration)
 785 {
 786         // Get the main chain from the theme, and set its state immediately.
 787         Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
 788         EffectChain *chain = theme_main_chain.chain;
 789         theme_main_chain.setup_chain();
 790         //theme_main_chain.chain->enable_phase_timing(true);
 791
 792         GLuint y_tex, cbcr_tex;
 793         bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
 794         assert(got_frame);
 795
 796         // Render main chain.
 797         GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 798         GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 799         GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 800         check_error();
 801         chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 802         resource_pool->release_fbo(fbo);
 803
 804         subsample_chroma(cbcr_full_tex, cbcr_tex);
 805         resource_pool->release_2d_texture(cbcr_full_tex);
 806
 807         // Set the right state for rgba_tex.
 808         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 809         glBindTexture(GL_TEXTURE_2D, rgba_tex);
 810         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 811         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 812         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 813
 814         const int64_t av_delay = TIMEBASE / 10;  // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
 815         RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
 816
 817         // The live frame just shows the RGBA texture we just rendered.
 818         // It owns rgba_tex now.
 819         DisplayFrame live_frame;
 820         live_frame.chain = display_chain.get();
 821         live_frame.setup_chain = [this, rgba_tex]{
 822                 display_input->set_texture_num(rgba_tex);
 823         };
 824         live_frame.ready_fence = fence;
 825         live_frame.input_frames = {};
 826         live_frame.temp_textures = { rgba_tex };
 827         output_channel[OUTPUT_LIVE].output_frame(live_frame);
 828
 829         // Set up preview and any additional channels.
 830         for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
 831                 DisplayFrame display_frame;
 832                 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state);  // FIXME: dimensions
 833                 display_frame.chain = chain.chain;
 834                 display_frame.setup_chain = chain.setup_chain;
 835                 display_frame.ready_fence = fence;
 836                 display_frame.input_frames = chain.input_frames;
 837                 display_frame.temp_textures = {};
 838                 output_channel[i].output_frame(display_frame);
 839         }
 840 }
 841
 842 void Mixer::audio_thread_func()
 843 {
 844         while (!should_quit) {
 845                 AudioTask task;
 846
 847                 {
 848                         unique_lock<mutex> lock(audio_mutex);
 849                         audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
 850                         if (should_quit) {
 851                                 return;
 852                         }
 853                         task = audio_task_queue.front();
 854                         audio_task_queue.pop();
 855                 }
 856
 857                 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
 858                         task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
 859                 vector<float> samples_out = audio_mixer.get_output(double(task.pts_int) / TIMEBASE, task.num_samples, rate_adjustment_policy);
 860
 861                 // Send the samples to the sound card, then add them to the output.
 862                 if (alsa) {
 863                         alsa->write(samples_out);
 864                 }
 865                 video_encoder->add_audio(task.pts_int, move(samples_out));
 866         }
 867 }
 868
 869 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 870 {
 871         GLuint vao;
 872         glGenVertexArrays(1, &vao);
 873         check_error();
 874
 875         glBindVertexArray(vao);
 876         check_error();
 877
 878         // Extract Cb/Cr.
 879         GLuint fbo = resource_pool->create_fbo(dst_tex);
 880         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 881         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 882         check_error();
 883
 884         glUseProgram(cbcr_program_num);
 885         check_error();
 886
 887         glActiveTexture(GL_TEXTURE0);
 888         check_error();
 889         glBindTexture(GL_TEXTURE_2D, src_tex);
 890         check_error();
 891         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 892         check_error();
 893         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 894         check_error();
 895         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 896         check_error();
 897
 898         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 899         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 900
 901         glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
 902         check_error();
 903
 904         for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
 905                 glEnableVertexAttribArray(attr_index);
 906                 check_error();
 907                 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
 908                 check_error();
 909         }
 910
 911         glDrawArrays(GL_TRIANGLES, 0, 3);
 912         check_error();
 913
 914         for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
 915                 glDisableVertexAttribArray(attr_index);
 916                 check_error();
 917         }
 918
 919         glUseProgram(0);
 920         check_error();
 921         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 922         check_error();
 923
 924         resource_pool->release_fbo(fbo);
 925         glDeleteVertexArrays(1, &vao);
 926 }
 927
 928 void Mixer::release_display_frame(DisplayFrame *frame)
 929 {
 930         for (GLuint texnum : frame->temp_textures) {
 931                 resource_pool->release_2d_texture(texnum);
 932         }
 933         frame->temp_textures.clear();
 934         frame->ready_fence.reset();
 935         frame->input_frames.clear();
 936 }
 937
 938 void Mixer::start()
 939 {
 940         mixer_thread = thread(&Mixer::thread_func, this);
 941         audio_thread = thread(&Mixer::audio_thread_func, this);
 942 }
 943
 944 void Mixer::quit()
 945 {
 946         should_quit = true;
 947         audio_task_queue_changed.notify_one();
 948         mixer_thread.join();
 949         audio_thread.join();
 950 }
 951
 952 void Mixer::transition_clicked(int transition_num)
 953 {
 954         theme->transition_clicked(transition_num, pts());
 955 }
 956
 957 void Mixer::channel_clicked(int preview_num)
 958 {
 959         theme->channel_clicked(preview_num);
 960 }
 961
 962 void Mixer::start_mode_scanning(unsigned card_index)
 963 {
 964         assert(card_index < num_cards);
 965         if (is_mode_scanning[card_index]) {
 966                 return;
 967         }
 968         is_mode_scanning[card_index] = true;
 969         mode_scanlist[card_index].clear();
 970         for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
 971                 mode_scanlist[card_index].push_back(mode.first);
 972         }
 973         assert(!mode_scanlist[card_index].empty());
 974         mode_scanlist_index[card_index] = 0;
 975         cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
 976         last_mode_scan_change[card_index] = steady_clock::now();
 977 }
 978
 979 Mixer::OutputChannel::~OutputChannel()
 980 {
 981         if (has_current_frame) {
 982                 parent->release_display_frame(&current_frame);
 983         }
 984         if (has_ready_frame) {
 985                 parent->release_display_frame(&ready_frame);
 986         }
 987 }
 988
 989 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 990 {
 991         // Store this frame for display. Remove the ready frame if any
 992         // (it was seemingly never used).
 993         {
 994                 unique_lock<mutex> lock(frame_mutex);
 995                 if (has_ready_frame) {
 996                         parent->release_display_frame(&ready_frame);
 997                 }
 998                 ready_frame = frame;
 999                 has_ready_frame = true;
1000         }
1001
1002         if (new_frame_ready_callback) {
1003                 new_frame_ready_callback();
1004         }
1005
1006         // Reduce the number of callbacks by filtering duplicates. The reason
1007         // why we bother doing this is that Qt seemingly can get into a state
1008         // where its builds up an essentially unbounded queue of signals,
1009         // consuming more and more memory, and there's no good way of collapsing
1010         // user-defined signals or limiting the length of the queue.
1011         if (transition_names_updated_callback) {
1012                 vector<string> transition_names = global_mixer->get_transition_names();
1013                 bool changed = false;
1014                 if (transition_names.size() != last_transition_names.size()) {
1015                         changed = true;
1016                 } else {
1017                         for (unsigned i = 0; i < transition_names.size(); ++i) {
1018                                 if (transition_names[i] != last_transition_names[i]) {
1019                                         changed = true;
1020                                         break;
1021                                 }
1022                         }
1023                 }
1024                 if (changed) {
1025                         transition_names_updated_callback(transition_names);
1026                         last_transition_names = transition_names;
1027                 }
1028         }
1029         if (name_updated_callback) {
1030                 string name = global_mixer->get_channel_name(channel);
1031                 if (name != last_name) {
1032                         name_updated_callback(name);
1033                         last_name = name;
1034                 }
1035         }
1036         if (color_updated_callback) {
1037                 string color = global_mixer->get_channel_color(channel);
1038                 if (color != last_color) {
1039                         color_updated_callback(color);
1040                         last_color = color;
1041                 }
1042         }
1043 }
1044
1045 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1046 {
1047         unique_lock<mutex> lock(frame_mutex);
1048         if (!has_current_frame && !has_ready_frame) {
1049                 return false;
1050         }
1051
1052         if (has_current_frame && has_ready_frame) {
1053                 // We have a new ready frame. Toss the current one.
1054                 parent->release_display_frame(&current_frame);
1055                 has_current_frame = false;
1056         }
1057         if (has_ready_frame) {
1058                 assert(!has_current_frame);
1059                 current_frame = ready_frame;
1060                 ready_frame.ready_fence.reset();  // Drop the refcount.
1061                 ready_frame.input_frames.clear();  // Drop the refcounts.
1062                 has_current_frame = true;
1063                 has_ready_frame = false;
1064         }
1065
1066         *frame = current_frame;
1067         return true;
1068 }
1069
1070 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1071 {
1072         new_frame_ready_callback = callback;
1073 }
1074
1075 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1076 {
1077         transition_names_updated_callback = callback;
1078 }
1079
1080 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1081 {
1082         name_updated_callback = callback;
1083 }
1084
1085 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1086 {
1087         color_updated_callback = callback;
1088 }
1089
1090 mutex RefCountedGLsync::fence_lock;