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

   1 #include "mainwindow.h"
   2
   3 #include "clip_list.h"
   4 #include "disk_space_estimator.h"
   5 #include "player.h"
   6 #include "post_to_main_thread.h"
   7 #include "timebase.h"
   8 #include "ui_mainwindow.h"
   9
  10 #include <string>
  11 #include <vector>
  12
  13 #include <QMouseEvent>
  14 #include <QWheelEvent>
  15 #include <QShortcut>
  16 #include <QTimer>
  17
  18 #include <sqlite3.h>
  19
  20 using namespace std;
  21 using namespace std::placeholders;
  22
  23 MainWindow *global_mainwindow = nullptr;
  24 ClipList *cliplist_clips;
  25 PlayList *playlist_clips;
  26
  27 extern int64_t current_pts;
  28 extern mutex frame_mu;
  29 extern vector<int64_t> frames[MAX_STREAMS];
  30
  31 MainWindow::MainWindow()
  32         : ui(new Ui::MainWindow),
  33           db("futatabi.db")
  34 {
  35         global_mainwindow = this;
  36         ui->setupUi(this);
  37
  38         // The menus.
  39         connect(ui->exit_action, &QAction::triggered, this, &MainWindow::exit_triggered);
  40
  41         global_disk_space_estimator = new DiskSpaceEstimator(bind(&MainWindow::report_disk_space, this, _1, _2));
  42         disk_free_label = new QLabel(this);
  43         disk_free_label->setStyleSheet("QLabel {padding-right: 5px;}");
  44         ui->menuBar->setCornerWidget(disk_free_label);
  45
  46         StateProto state = db.get_state();
  47
  48         cliplist_clips = new ClipList(state.clip_list());
  49         ui->clip_list->setModel(cliplist_clips);
  50         connect(cliplist_clips, &ClipList::any_content_changed, this, &MainWindow::content_changed);
  51
  52         playlist_clips = new PlayList(state.play_list());
  53         ui->playlist->setModel(playlist_clips);
  54         connect(playlist_clips, &PlayList::any_content_changed, this, &MainWindow::content_changed);
  55
  56         // For scrubbing in the pts columns.
  57         ui->clip_list->viewport()->installEventFilter(this);
  58         ui->playlist->viewport()->installEventFilter(this);
  59
  60         QShortcut *cue_in = new QShortcut(QKeySequence(Qt::Key_A), this);
  61         connect(cue_in, &QShortcut::activated, ui->cue_in_btn, &QPushButton::click);
  62         connect(ui->cue_in_btn, &QPushButton::clicked, this, &MainWindow::cue_in_clicked);
  63
  64         QShortcut *cue_out = new QShortcut(QKeySequence(Qt::Key_S), this);
  65         connect(cue_out, &QShortcut::activated, ui->cue_out_btn, &QPushButton::click);
  66         connect(ui->cue_out_btn, &QPushButton::clicked, this, &MainWindow::cue_out_clicked);
  67
  68         QShortcut *queue = new QShortcut(QKeySequence(Qt::Key_Q), this);
  69         connect(queue, &QShortcut::activated, ui->queue_btn, &QPushButton::click);
  70         connect(ui->queue_btn, &QPushButton::clicked, this, &MainWindow::queue_clicked);
  71
  72         QShortcut *preview = new QShortcut(QKeySequence(Qt::Key_W), this);
  73         connect(preview, &QShortcut::activated, ui->preview_btn, &QPushButton::click);
  74         connect(ui->preview_btn, &QPushButton::clicked, this, &MainWindow::preview_clicked);
  75
  76         QShortcut *play = new QShortcut(QKeySequence(Qt::Key_Space), this);
  77         connect(play, &QShortcut::activated, ui->play_btn, &QPushButton::click);
  78         connect(ui->play_btn, &QPushButton::clicked, this, &MainWindow::play_clicked);
  79
  80         QShortcut *preview_1 = new QShortcut(QKeySequence(Qt::Key_1), this);
  81         connect(preview_1, &QShortcut::activated, ui->preview_1_btn, &QPushButton::click);
  82         connect(ui->input1_display, &JPEGFrameView::clicked, ui->preview_1_btn, &QPushButton::click);
  83         connect(ui->preview_1_btn, &QPushButton::clicked, [this]{ preview_angle_clicked(0); });
  84         ui->input1_display->set_overlay("1");
  85
  86         QShortcut *preview_2 = new QShortcut(QKeySequence(Qt::Key_2), this);
  87         connect(preview_2, &QShortcut::activated, ui->preview_2_btn, &QPushButton::click);
  88         connect(ui->input2_display, &JPEGFrameView::clicked, ui->preview_2_btn, &QPushButton::click);
  89         connect(ui->preview_2_btn, &QPushButton::clicked, [this]{ preview_angle_clicked(1); });
  90         ui->input2_display->set_overlay("2");
  91
  92         QShortcut *preview_3 = new QShortcut(QKeySequence(Qt::Key_3), this);
  93         connect(preview_3, &QShortcut::activated, ui->preview_3_btn, &QPushButton::click);
  94         connect(ui->input3_display, &JPEGFrameView::clicked, ui->preview_3_btn, &QPushButton::click);
  95         connect(ui->preview_3_btn, &QPushButton::clicked, [this]{ preview_angle_clicked(2); });
  96         ui->input3_display->set_overlay("3");
  97
  98         QShortcut *preview_4 = new QShortcut(QKeySequence(Qt::Key_4), this);
  99         connect(preview_4, &QShortcut::activated, ui->preview_4_btn, &QPushButton::click);
 100         connect(ui->input4_display, &JPEGFrameView::clicked, ui->preview_4_btn, &QPushButton::click);
 101         connect(ui->preview_4_btn, &QPushButton::clicked, [this]{ preview_angle_clicked(3); });
 102         ui->input4_display->set_overlay("4");
 103
 104         connect(ui->playlist_duplicate_btn, &QPushButton::clicked, this, &MainWindow::playlist_duplicate);
 105
 106         connect(ui->playlist_remove_btn, &QPushButton::clicked, this, &MainWindow::playlist_remove);
 107         QShortcut *delete_key = new QShortcut(QKeySequence(Qt::Key_Delete), ui->playlist);
 108         connect(delete_key, &QShortcut::activated, [this] {
 109                 if (ui->playlist->hasFocus()) {
 110                         playlist_remove();
 111                 }
 112         });
 113
 114         // TODO: support drag-and-drop.
 115         connect(ui->playlist_move_up_btn, &QPushButton::clicked, [this]{ playlist_move(-1); });
 116         connect(ui->playlist_move_down_btn, &QPushButton::clicked, [this]{ playlist_move(1); });
 117
 118         connect(ui->playlist->selectionModel(), &QItemSelectionModel::selectionChanged,
 119                 this, &MainWindow::playlist_selection_changed);
 120         playlist_selection_changed();  // First time set-up.
 121
 122         preview_player = new Player(ui->preview_display, /*also_output_to_stream=*/false);
 123         live_player = new Player(ui->live_display, /*also_output_to_stream=*/true);
 124         live_player->set_done_callback([this]{
 125                 post_to_main_thread([this]{
 126                         live_player_clip_done();
 127                 });
 128         });
 129         live_player->set_next_clip_callback(bind(&MainWindow::live_player_get_next_clip, this));
 130         live_player->set_progress_callback([this](double played_this_clip, double total_length) {
 131                 post_to_main_thread([this, played_this_clip, total_length] {
 132                         live_player_clip_progress(played_this_clip, total_length);
 133                 });
 134         });
 135
 136         defer_timeout = new QTimer(this);
 137         defer_timeout->setSingleShot(true);
 138         connect(defer_timeout, &QTimer::timeout, this, &MainWindow::defer_timer_expired);
 139 }
 140
 141 void MainWindow::cue_in_clicked()
 142 {
 143         if (!cliplist_clips->empty() && cliplist_clips->back()->pts_out < 0) {
 144                 cliplist_clips->mutable_back()->pts_in = current_pts;
 145                 return;
 146         }
 147         Clip clip;
 148         clip.pts_in = current_pts;
 149         cliplist_clips->add_clip(clip);
 150         playlist_selection_changed();
 151 }
 152
 153 void MainWindow::cue_out_clicked()
 154 {
 155         if (!cliplist_clips->empty()) {
 156                 cliplist_clips->mutable_back()->pts_out = current_pts;
 157                 // TODO: select the row in the clip list?
 158         }
 159 }
 160
 161 void MainWindow::queue_clicked()
 162 {
 163         if (cliplist_clips->empty()) {
 164                 return;
 165         }
 166
 167         QItemSelectionModel *selected = ui->clip_list->selectionModel();
 168         if (!selected->hasSelection()) {
 169                 Clip clip = *cliplist_clips->back();
 170                 clip.stream_idx = 0;
 171                 if (clip.pts_out != -1) {
 172                         playlist_clips->add_clip(clip);
 173                         playlist_selection_changed();
 174                 }
 175                 return;
 176         }
 177
 178         QModelIndex index = selected->currentIndex();
 179         Clip clip = *cliplist_clips->clip(index.row());
 180         if (index.column() >= int(ClipList::Column::CAMERA_1) &&
 181             index.column() <= int(ClipList::Column::CAMERA_4)) {
 182                 clip.stream_idx = index.column() - int(ClipList::Column::CAMERA_1);
 183         } else {
 184                 clip.stream_idx = ui->preview_display->get_stream_idx();
 185         }
 186
 187         if (clip.pts_out != -1) {
 188                 playlist_clips->add_clip(clip);
 189                 playlist_selection_changed();
 190         }
 191 }
 192
 193 void MainWindow::preview_clicked()
 194 {
 195         if (cliplist_clips->empty()) return;
 196
 197         QItemSelectionModel *selected = ui->clip_list->selectionModel();
 198         if (!selected->hasSelection()) {
 199                 preview_player->play_clip(*cliplist_clips->back(), 0);
 200                 return;
 201         }
 202
 203         QModelIndex index = selected->currentIndex();
 204         unsigned stream_idx;
 205         if (index.column() >= int(ClipList::Column::CAMERA_1) &&
 206             index.column() <= int(ClipList::Column::CAMERA_4)) {
 207                 stream_idx = index.column() - int(ClipList::Column::CAMERA_1);
 208         } else {
 209                 stream_idx = ui->preview_display->get_stream_idx();
 210         }
 211         preview_player->play_clip(*cliplist_clips->clip(index.row()), stream_idx);
 212 }
 213
 214 void MainWindow::preview_angle_clicked(unsigned stream_idx)
 215 {
 216         preview_player->override_angle(stream_idx);
 217
 218         // Change the selection if we were previewing a clip from the clip list.
 219         // (The only other thing we could be showing is a pts scrub, and if so,
 220         // that would be selected.)
 221         QItemSelectionModel *selected = ui->clip_list->selectionModel();
 222         if (selected->hasSelection()) {
 223                 QModelIndex cell = selected->selectedIndexes()[0];
 224                 int column = int(ClipList::Column::CAMERA_1) + stream_idx;
 225                 selected->setCurrentIndex(cell.sibling(cell.row(), column), QItemSelectionModel::ClearAndSelect);
 226         }
 227 }
 228
 229 void MainWindow::playlist_duplicate()
 230 {
 231         QItemSelectionModel *selected = ui->playlist->selectionModel();
 232         if (!selected->hasSelection()) {
 233                 // Should have been grayed out, but OK.
 234                 return;
 235         }
 236         QModelIndexList rows = selected->selectedRows();
 237         int first = rows.front().row(), last = rows.back().row();
 238         playlist_clips->duplicate_clips(first, last);
 239         playlist_selection_changed();
 240 }
 241
 242 void MainWindow::playlist_remove()
 243 {
 244         QItemSelectionModel *selected = ui->playlist->selectionModel();
 245         if (!selected->hasSelection()) {
 246                 // Should have been grayed out, but OK.
 247                 return;
 248         }
 249         QModelIndexList rows = selected->selectedRows();
 250         int first = rows.front().row(), last = rows.back().row();
 251         playlist_clips->erase_clips(first, last);
 252
 253         // TODO: select the next one in the list?
 254
 255         playlist_selection_changed();
 256 }
 257
 258 void MainWindow::playlist_move(int delta)
 259 {
 260         QItemSelectionModel *selected = ui->playlist->selectionModel();
 261         if (!selected->hasSelection()) {
 262                 // Should have been grayed out, but OK.
 263                 return;
 264         }
 265
 266         QModelIndexList rows = selected->selectedRows();
 267         int first = rows.front().row(), last = rows.back().row();
 268         if ((delta == -1 && first == 0) ||
 269             (delta == 1 && size_t(last) == playlist_clips->size() - 1)) {
 270                 // Should have been grayed out, but OK.
 271                 return;
 272         }
 273
 274         playlist_clips->move_clips(first, last, delta);
 275         playlist_selection_changed();
 276 }
 277
 278 void MainWindow::defer_timer_expired()
 279 {
 280         state_changed(deferred_state);
 281 }
 282
 283 void MainWindow::content_changed()
 284 {
 285         if (defer_timeout->isActive() &&
 286             (!currently_deferring_model_changes || deferred_change_id != current_change_id)) {
 287                 // There's some deferred event waiting, but this event is unrelated.
 288                 // So it's time to short-circuit that timer and do the work it wanted to do.
 289                 defer_timeout->stop();
 290                 state_changed(deferred_state);
 291         }
 292         StateProto state;
 293         *state.mutable_clip_list() = cliplist_clips->serialize();
 294         *state.mutable_play_list() = playlist_clips->serialize();
 295         if (currently_deferring_model_changes) {
 296                 deferred_change_id = current_change_id;
 297                 deferred_state = std::move(state);
 298                 defer_timeout->start(200);
 299                 return;
 300         }
 301         state_changed(state);
 302 }
 303
 304 void MainWindow::state_changed(const StateProto &state)
 305 {
 306         db.store_state(state);
 307 }
 308
 309 void MainWindow::play_clicked()
 310 {
 311         if (playlist_clips->empty()) return;
 312
 313         QItemSelectionModel *selected = ui->playlist->selectionModel();
 314         int row;
 315         if (!selected->hasSelection()) {
 316                 row = 0;
 317         } else {
 318                 row = selected->selectedRows(0)[0].row();
 319         }
 320
 321         const Clip &clip = *playlist_clips->clip(row);
 322         live_player->play_clip(clip, clip.stream_idx);
 323         playlist_clips->set_currently_playing(row, 0.0f);
 324         playlist_selection_changed();
 325 }
 326
 327 void MainWindow::live_player_clip_done()
 328 {
 329         int row = playlist_clips->get_currently_playing();
 330         if (row == -1 || row == int(playlist_clips->size()) - 1) {
 331                 ui->live_label->setText("Current output (paused)");
 332                 playlist_clips->set_currently_playing(-1, 0.0f);
 333         } else {
 334                 playlist_clips->set_currently_playing(row + 1, 0.0f);
 335         }
 336 }
 337
 338 Clip MainWindow::live_player_get_next_clip()
 339 {
 340         // FIXME: threading
 341         int row = playlist_clips->get_currently_playing();
 342         if (row != -1 && row < int(playlist_clips->size()) - 1) {
 343                 return *playlist_clips->clip(row + 1);
 344         } else {
 345                 return Clip();
 346         }
 347 }
 348
 349 void MainWindow::live_player_clip_progress(double played_this_clip, double total_length)
 350 {
 351         playlist_clips->set_currently_playing(playlist_clips->get_currently_playing(), played_this_clip / total_length);
 352
 353         double remaining = total_length - played_this_clip;
 354         for (int row = playlist_clips->get_currently_playing() + 1; row < int(playlist_clips->size()); ++row) {
 355                 const Clip clip = *playlist_clips->clip(row);
 356                 remaining += double(clip.pts_out - clip.pts_in) / TIMEBASE / 0.5;   // FIXME: stop hardcoding speed.
 357         }
 358         int remaining_ms = lrint(remaining * 1e3);
 359
 360         int ms = remaining_ms % 1000;
 361         remaining_ms /= 1000;
 362         int s = remaining_ms % 60;
 363         remaining_ms /= 60;
 364         int m = remaining_ms;
 365
 366         char buf[256];
 367         snprintf(buf, sizeof(buf), "Current output (%d:%02d.%03d left)", m, s, ms);
 368         ui->live_label->setText(buf);
 369 }
 370
 371 void MainWindow::resizeEvent(QResizeEvent *event)
 372 {
 373         QMainWindow::resizeEvent(event);
 374
 375         // Ask for a relayout, but only after the event loop is done doing relayout
 376         // on everything else.
 377         QMetaObject::invokeMethod(this, "relayout", Qt::QueuedConnection);
 378 }
 379
 380 void MainWindow::relayout()
 381 {
 382         ui->live_display->setMinimumWidth(ui->live_display->height() * 16 / 9);
 383         ui->preview_display->setMinimumWidth(ui->preview_display->height() * 16 / 9);
 384 }
 385
 386 void set_pts_in(int64_t pts, int64_t current_pts, ClipProxy &clip)
 387 {
 388         pts = std::max<int64_t>(pts, 0);
 389         if (clip->pts_out == -1) {
 390                 pts = std::min(pts, current_pts);
 391         } else {
 392                 pts = std::min(pts, clip->pts_out);
 393         }
 394         clip->pts_in = pts;
 395 }
 396
 397 bool MainWindow::eventFilter(QObject *watched, QEvent *event)
 398 {
 399         constexpr int dead_zone_pixels = 3;  // To avoid that simple clicks get misinterpreted.
 400         constexpr int scrub_sensitivity = 100;  // pts units per pixel.
 401         constexpr int wheel_sensitivity = 100;  // pts units per degree.
 402         constexpr int camera_degrees_per_pixel = 15;  // One click of most mice.
 403
 404         unsigned stream_idx = ui->preview_display->get_stream_idx();
 405
 406         if (event->type() != QEvent::Wheel) {
 407                 last_mousewheel_camera_row = -1;
 408         }
 409
 410         if (event->type() == QEvent::MouseButtonPress) {
 411                 QMouseEvent *mouse = (QMouseEvent *)event;
 412
 413                 QTableView *destination;
 414                 ScrubType type;
 415
 416                 if (watched == ui->clip_list->viewport()) {
 417                         destination = ui->clip_list;
 418                         type = SCRUBBING_CLIP_LIST;
 419                 } else if (watched == ui->playlist->viewport()) {
 420                         destination = ui->playlist;
 421                         type = SCRUBBING_PLAYLIST;
 422                 } else {
 423                         return false;
 424                 }
 425                 int column = destination->columnAt(mouse->x());
 426                 int row = destination->rowAt(mouse->y());
 427                 if (column == -1 || row == -1) return false;
 428
 429                 if (type == SCRUBBING_CLIP_LIST) {
 430                         if (ClipList::Column(column) == ClipList::Column::IN) {
 431                                 scrub_pts_origin = cliplist_clips->clip(row)->pts_in;
 432                                 preview_single_frame(scrub_pts_origin, stream_idx, FIRST_AT_OR_AFTER);
 433                         } else if (ClipList::Column(column) == ClipList::Column::OUT) {
 434                                 scrub_pts_origin = cliplist_clips->clip(row)->pts_out;
 435                                 preview_single_frame(scrub_pts_origin, stream_idx, LAST_BEFORE);
 436                         } else {
 437                                 return false;
 438                         }
 439                 } else {
 440                         if (PlayList::Column(column) == PlayList::Column::IN) {
 441                                 scrub_pts_origin = playlist_clips->clip(row)->pts_in;
 442                                 preview_single_frame(scrub_pts_origin, stream_idx, FIRST_AT_OR_AFTER);
 443                         } else if (PlayList::Column(column) == PlayList::Column::OUT) {
 444                                 scrub_pts_origin = playlist_clips->clip(row)->pts_out;
 445                                 preview_single_frame(scrub_pts_origin, stream_idx, LAST_BEFORE);
 446                         } else {
 447                                 return false;
 448                         }
 449                 }
 450
 451                 scrubbing = true;
 452                 scrub_row = row;
 453                 scrub_column = column;
 454                 scrub_x_origin = mouse->x();
 455                 scrub_type = type;
 456         } else if (event->type() == QEvent::MouseMove) {
 457                 if (scrubbing) {
 458                         QMouseEvent *mouse = (QMouseEvent *)event;
 459                         int offset = mouse->x() - scrub_x_origin;
 460                         int adjusted_offset;
 461                         if (offset >= dead_zone_pixels) {
 462                                 adjusted_offset = offset - dead_zone_pixels;
 463                         } else if (offset < -dead_zone_pixels) {
 464                                 adjusted_offset = offset + dead_zone_pixels;
 465                         } else {
 466                                 adjusted_offset = 0;
 467                         }
 468
 469                         int64_t pts = scrub_pts_origin + adjusted_offset * scrub_sensitivity;
 470                         currently_deferring_model_changes = true;
 471                         if (scrub_type == SCRUBBING_CLIP_LIST) {
 472                                 ClipProxy clip = cliplist_clips->mutable_clip(scrub_row);
 473                                 if (scrub_column == int(ClipList::Column::IN)) {
 474                                         current_change_id = "cliplist:in:" + to_string(scrub_row);
 475                                         set_pts_in(pts, current_pts, clip);
 476                                         preview_single_frame(pts, stream_idx, FIRST_AT_OR_AFTER);
 477                                 } else {
 478                                         current_change_id = "cliplist:out" + to_string(scrub_row);
 479                                         pts = std::max(pts, clip->pts_in);
 480                                         pts = std::min(pts, current_pts);
 481                                         clip->pts_out = pts;
 482                                         preview_single_frame(pts, stream_idx, LAST_BEFORE);
 483                                 }
 484                         } else {
 485                                 ClipProxy clip = playlist_clips->mutable_clip(scrub_row);
 486                                 if (scrub_column == int(PlayList::Column::IN)) {
 487                                         current_change_id = "playlist:in:" + to_string(scrub_row);
 488                                         set_pts_in(pts, current_pts, clip);
 489                                         preview_single_frame(pts, clip->stream_idx, FIRST_AT_OR_AFTER);
 490                                 } else {
 491                                         current_change_id = "playlist:out:" + to_string(scrub_row);
 492                                         pts = std::max(pts, clip->pts_in);
 493                                         pts = std::min(pts, current_pts);
 494                                         clip->pts_out = pts;
 495                                         preview_single_frame(pts, clip->stream_idx, LAST_BEFORE);
 496                                 }
 497                         }
 498                         currently_deferring_model_changes = false;
 499
 500                         return true;  // Don't use this mouse movement for selecting things.
 501                 }
 502         } else if (event->type() == QEvent::Wheel) {
 503                 QWheelEvent *wheel = (QWheelEvent *)event;
 504
 505                 QTableView *destination;
 506                 int in_column, out_column, camera_column;
 507                 if (watched == ui->clip_list->viewport()) {
 508                         destination = ui->clip_list;
 509                         in_column = int(ClipList::Column::IN);
 510                         out_column = int(ClipList::Column::OUT);
 511                         camera_column = -1;
 512                         last_mousewheel_camera_row = -1;
 513                 } else if (watched == ui->playlist->viewport()) {
 514                         destination = ui->playlist;
 515                         in_column = int(PlayList::Column::IN);
 516                         out_column = int(PlayList::Column::OUT);
 517                         camera_column = int(PlayList::Column::CAMERA);
 518                 } else {
 519                         last_mousewheel_camera_row = -1;
 520                         return false;
 521                 }
 522                 int column = destination->columnAt(wheel->x());
 523                 int row = destination->rowAt(wheel->y());
 524                 if (column == -1 || row == -1) return false;
 525
 526                 currently_deferring_model_changes = true;
 527                 {
 528                         current_change_id = (watched == ui->clip_list->viewport()) ? "cliplist:" : "playlist:";
 529                         ClipProxy clip = (watched == ui->clip_list->viewport()) ?
 530                                 cliplist_clips->mutable_clip(row) : playlist_clips->mutable_clip(row);
 531                         if (watched == ui->playlist->viewport()) {
 532                                 stream_idx = clip->stream_idx;
 533                         }
 534
 535                         if (column != camera_column) {
 536                                 last_mousewheel_camera_row = -1;
 537                         }
 538                         if (column == in_column) {
 539                                 current_change_id += "in:" + to_string(row);
 540                                 int64_t pts = clip->pts_in + wheel->angleDelta().y() * wheel_sensitivity;
 541                                 set_pts_in(pts, current_pts, clip);
 542                                 preview_single_frame(pts, stream_idx, FIRST_AT_OR_AFTER);
 543                         } else if (column == out_column) {
 544                                 current_change_id += "out:" + to_string(row);
 545                                 int64_t pts = clip->pts_out + wheel->angleDelta().y() * wheel_sensitivity;
 546                                 pts = std::max(pts, clip->pts_in);
 547                                 pts = std::min(pts, current_pts);
 548                                 clip->pts_out = pts;
 549                                 preview_single_frame(pts, stream_idx, LAST_BEFORE);
 550                         } else if (column == camera_column) {
 551                                 current_change_id += "camera:" + to_string(row);
 552                                 int angle_degrees = wheel->angleDelta().y();
 553                                 if (last_mousewheel_camera_row == row) {
 554                                         angle_degrees += leftover_angle_degrees;
 555                                 }
 556
 557                                 int stream_idx = clip->stream_idx + angle_degrees / camera_degrees_per_pixel;
 558                                 stream_idx = std::max(stream_idx, 0);
 559                                 stream_idx = std::min(stream_idx, NUM_CAMERAS - 1);
 560                                 clip->stream_idx = stream_idx;
 561
 562                                 last_mousewheel_camera_row = row;
 563                                 leftover_angle_degrees = angle_degrees % camera_degrees_per_pixel;
 564
 565                                 // Don't update the live view, that's rarely what the operator wants.
 566                         }
 567                 }
 568                 currently_deferring_model_changes = false;
 569         } else if (event->type() == QEvent::MouseButtonRelease) {
 570                 scrubbing = false;
 571         }
 572         return false;
 573 }
 574
 575 void MainWindow::preview_single_frame(int64_t pts, unsigned stream_idx, MainWindow::Rounding rounding)
 576 {
 577         if (rounding == LAST_BEFORE) {
 578                 lock_guard<mutex> lock(frame_mu);
 579                 if (frames[stream_idx].empty()) return;
 580                 auto it = lower_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts);
 581                 if (it != frames[stream_idx].end()) {
 582                         pts = *it;
 583                 }
 584         } else {
 585                 assert(rounding == FIRST_AT_OR_AFTER);
 586                 lock_guard<mutex> lock(frame_mu);
 587                 if (frames[stream_idx].empty()) return;
 588                 auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts - 1);
 589                 if (it != frames[stream_idx].end()) {
 590                         pts = *it;
 591                 }
 592         }
 593
 594         Clip fake_clip;
 595         fake_clip.pts_in = pts;
 596         fake_clip.pts_out = pts + 1;
 597         preview_player->play_clip(fake_clip, stream_idx);
 598 }
 599
 600 void MainWindow::playlist_selection_changed()
 601 {
 602         QItemSelectionModel *selected = ui->playlist->selectionModel();
 603         bool any_selected = selected->hasSelection();
 604         ui->playlist_duplicate_btn->setEnabled(any_selected);
 605         ui->playlist_remove_btn->setEnabled(any_selected);
 606         ui->playlist_move_up_btn->setEnabled(
 607                 any_selected && selected->selectedRows().front().row() > 0);
 608         ui->playlist_move_down_btn->setEnabled(
 609                 any_selected && selected->selectedRows().back().row() < int(playlist_clips->size()) - 1);
 610         ui->play_btn->setEnabled(!playlist_clips->empty());
 611 }
 612
 613 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
 614 {
 615         char time_str[256];
 616         if (estimated_seconds_left < 60.0) {
 617                 strcpy(time_str, "<font color=\"red\">Less than a minute</font>");
 618         } else if (estimated_seconds_left < 1800.0) {  // Less than half an hour: Xm Ys (red).
 619                 int s = lrintf(estimated_seconds_left);
 620                 int m = s / 60;
 621                 s %= 60;
 622                 snprintf(time_str, sizeof(time_str), "<font color=\"red\">%dm %ds</font>", m, s);
 623         } else if (estimated_seconds_left < 3600.0) {  // Less than an hour: Xm.
 624                 int m = lrintf(estimated_seconds_left / 60.0);
 625                 snprintf(time_str, sizeof(time_str), "%dm", m);
 626         } else if (estimated_seconds_left < 36000.0) {  // Less than ten hours: Xh Ym.
 627                 int m = lrintf(estimated_seconds_left / 60.0);
 628                 int h = m / 60;
 629                 m %= 60;
 630                 snprintf(time_str, sizeof(time_str), "%dh %dm", h, m);
 631         } else {  // More than ten hours: Xh.
 632                 int h = lrintf(estimated_seconds_left / 3600.0);
 633                 snprintf(time_str, sizeof(time_str), "%dh", h);
 634         }
 635         char buf[256];
 636         snprintf(buf, sizeof(buf), "Disk free: %'.0f MB (approx. %s)", free_bytes / 1048576.0, time_str);
 637
 638         std::string label = buf;
 639
 640         post_to_main_thread([this, label]{
 641                         disk_free_label->setText(QString::fromStdString(label));
 642                         ui->menuBar->setCornerWidget(disk_free_label);  // Need to set this again for the sizing to get right.
 643                         });
 644 }
 645
 646 void MainWindow::exit_triggered()
 647 {
 648         close();
 649 }
 650