git.sesse.net Git - nageru/blob - futatabi/player.cpp

   1 #include "player.h"
   2
   3 #include "clip_list.h"
   4 #include "defs.h"
   5 #include "flags.h"
   6 #include "frame_on_disk.h"
   7 #include "jpeg_frame_view.h"
   8 #include "shared/context.h"
   9 #include "shared/ffmpeg_raii.h"
  10 #include "shared/httpd.h"
  11 #include "shared/metrics.h"
  12 #include "shared/mux.h"
  13 #include "shared/timebase.h"
  14 #include "video_stream.h"
  15
  16 #include <algorithm>
  17 #include <chrono>
  18 #include <condition_variable>
  19 #include <movit/util.h>
  20 #include <mutex>
  21 #include <stdio.h>
  22 #include <thread>
  23 #include <vector>
  24
  25 using namespace std;
  26 using namespace std::chrono;
  27
  28 extern HTTPD *global_httpd;
  29
  30 void Player::thread_func(AVFormatContext *file_avctx)
  31 {
  32         pthread_setname_np(pthread_self(), "Player");
  33
  34         QSurface *surface = create_surface();
  35         QOpenGLContext *context = create_context(surface);
  36         if (!make_current(context, surface)) {
  37                 printf("oops\n");
  38                 exit(1);
  39         }
  40
  41         check_error();
  42
  43         // Create the VideoStream object, now that we have an OpenGL context.
  44         if (stream_output != NO_STREAM_OUTPUT) {
  45                 video_stream.reset(new VideoStream(file_avctx));
  46                 video_stream->start();
  47         }
  48
  49         check_error();
  50
  51         while (!should_quit) {
  52                 play_playlist_once();
  53         }
  54 }
  55
  56 namespace {
  57
  58 double calc_progress(const Clip &clip, int64_t pts)
  59 {
  60         return double(pts - clip.pts_in) / (clip.pts_out - clip.pts_in);
  61 }
  62
  63 void do_splice(const vector<ClipWithID> &new_list, size_t playing_index1, ssize_t playing_index2, vector<ClipWithID> *old_list)
  64 {
  65         assert(playing_index2 == -1 || size_t(playing_index2) == playing_index1 + 1);
  66
  67         // First see if we can do the simple thing; find an element in the new
  68         // list that we are already playing, which will serve as our splice point.
  69         int splice_start_new_list = -1;
  70         for (size_t clip_idx = 0; clip_idx < new_list.size(); ++clip_idx) {
  71                 if (new_list[clip_idx].id == (*old_list)[playing_index1].id) {
  72                         splice_start_new_list = clip_idx + 1;
  73                 } else if (playing_index2 != -1 && new_list[clip_idx].id == (*old_list)[playing_index2].id) {
  74                         splice_start_new_list = clip_idx + 1;
  75                 }
  76         }
  77         if (splice_start_new_list == -1) {
  78                 // OK, so the playing items are no longer in the new list. Most likely,
  79                 // that means we deleted some range that included them. But the ones
  80                 // before should stay put -- and we don't want to play them. So find
  81                 // the ones that we've already played, and ignore them. Hopefully,
  82                 // they're contiguous; the last one that's not seen will be our cut point.
  83                 //
  84                 // Keeping track of the playlist range explicitly in the UI would remove
  85                 // the need for these heuristics, but it would probably also mean we'd
  86                 // have to lock the playing clip, which sounds annoying.
  87                 unordered_map<uint64_t, size_t> played_ids;
  88                 for (size_t clip_idx = 0; clip_idx < playing_index1; ++old_list) {
  89                         played_ids.emplace((*old_list)[clip_idx].id, clip_idx);
  90                 }
  91                 for (size_t clip_idx = 0; clip_idx < new_list.size(); ++clip_idx) {
  92                         if (played_ids.count(new_list[clip_idx].id)) {
  93                                 splice_start_new_list = clip_idx + 1;
  94                         }
  95                 }
  96
  97                 if (splice_start_new_list == -1) {
  98                         // OK, we didn't find any matches; the lists are totally distinct.
  99                         // So probably the entire thing was deleted; leave it alone.
 100                         return;
 101                 }
 102         }
 103
 104         size_t splice_start_old_list = ((playing_index2 == -1) ? playing_index1 : playing_index2) + 1;
 105         old_list->erase(old_list->begin() + splice_start_old_list, old_list->end());
 106         old_list->insert(old_list->end(), new_list.begin() + splice_start_new_list, new_list.end());
 107 }
 108
 109 }  // namespace
 110
 111 void Player::play_playlist_once()
 112 {
 113         vector<ClipWithID> clip_list;
 114         bool clip_ready;
 115         steady_clock::time_point before_sleep = steady_clock::now();
 116         string pause_status;
 117         float master_speed = 1.0f;
 118
 119         // Wait until we're supposed to play something.
 120         {
 121                 unique_lock<mutex> lock(queue_state_mu);
 122                 playing = false;
 123                 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
 124                         return should_quit || new_clip_ready;
 125                 });
 126                 if (should_quit) {
 127                         return;
 128                 }
 129                 if (clip_ready) {
 130                         new_clip_ready = false;
 131                         playing = true;
 132                         clip_list = move(queued_clip_list);
 133                         queued_clip_list.clear();
 134                         assert(!clip_list.empty());
 135                         assert(!splice_ready);  // This corner case should have been handled in splice_play().
 136                 } else {
 137                         pause_status = this->pause_status;
 138                 }
 139         }
 140
 141         steady_clock::duration time_slept = steady_clock::now() - before_sleep;
 142         pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
 143
 144         if (!clip_ready) {
 145                 if (video_stream != nullptr) {
 146                         ++metric_refresh_frame;
 147                         string subtitle = "Futatabi " NAGERU_VERSION ";PAUSED;0.000;" + pause_status;
 148                         video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder(),
 149                                 subtitle);
 150                 }
 151                 return;
 152         }
 153
 154         steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
 155         int64_t in_pts_origin = clip_list[0].clip.pts_in;
 156         for (size_t clip_idx = 0; clip_idx < clip_list.size(); ++clip_idx) {
 157                 const Clip *clip = &clip_list[clip_idx].clip;
 158                 const Clip *next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
 159                 int64_t out_pts_origin = pts;
 160
 161                 double next_clip_fade_time = -1.0;
 162                 if (next_clip != nullptr) {
 163                         double duration_this_clip = double(clip->pts_out - in_pts_origin) / TIMEBASE / clip->speed;
 164                         double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
 165                         next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
 166                 }
 167
 168                 int stream_idx = clip->stream_idx;
 169
 170                 // Start playing exactly at a frame.
 171                 // TODO: Snap secondary (fade-to) clips in the same fashion
 172                 // so that we don't get jank here).
 173                 {
 174                         lock_guard<mutex> lock(frame_mu);
 175
 176                         // Find the first frame such that frame.pts <= in_pts.
 177                         auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
 178                         if (it != frames[stream_idx].end()) {
 179                                 in_pts_origin = it->pts;
 180                         }
 181                 }
 182
 183                 steady_clock::time_point next_frame_start;
 184                 for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 185                         double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
 186                         next_frame_start =
 187                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 188                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip->speed * master_speed / global_flags.output_framerate);
 189                         pts = lrint(out_pts);
 190
 191                         float new_master_speed = change_master_speed.exchange(0.0f / 0.0f);
 192                         if (!std::isnan(new_master_speed)) {
 193                                 master_speed = new_master_speed;
 194                                 in_pts_origin = in_pts - TIMEBASE * frameno * clip->speed * master_speed / global_flags.output_framerate;
 195                                 out_pts_origin = out_pts - TIMEBASE * frameno / global_flags.output_framerate;
 196                         }
 197
 198                         if (in_pts >= clip->pts_out) {
 199                                 break;
 200                         }
 201
 202                         {
 203                                 lock_guard<mutex> lock(queue_state_mu);
 204                                 if (splice_ready) {
 205                                         if (next_clip == nullptr) {
 206                                                 do_splice(to_splice_clip_list, clip_idx, -1, &clip_list);
 207                                         } else {
 208                                                 do_splice(to_splice_clip_list, clip_idx, clip_idx + 1, &clip_list);
 209                                         }
 210                                         to_splice_clip_list.clear();
 211                                         splice_ready = false;
 212
 213                                         // Refresh the clip pointer, since the clip list may have been reallocated.
 214                                         clip = &clip_list[clip_idx].clip;
 215
 216                                         // Recompute next_clip and any needed fade times, since the next clip may have changed
 217                                         // (or we may have gone from no new clip to having one, or the other way).
 218                                         next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
 219                                         if (next_clip != nullptr) {
 220                                                 double duration_this_clip = double(clip->pts_out - in_pts) / TIMEBASE / clip->speed;
 221                                                 double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
 222                                                 next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
 223                                         }
 224                                 }
 225                         }
 226
 227                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 228                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
 229                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 230                                         lrint(1e3 * duration<double>(time_behind).count()));
 231                                 ++metric_dropped_unconditional_frame;
 232                                 continue;
 233                         }
 234
 235                         // pts not affected by the swapping below.
 236                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 237
 238                         int primary_stream_idx = stream_idx;
 239                         FrameOnDisk secondary_frame;
 240                         int secondary_stream_idx = -1;
 241                         float fade_alpha = 0.0f;
 242                         double time_left_this_clip = double(clip->pts_out - in_pts) / TIMEBASE / clip->speed;
 243                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 244                                 // We're in a fade to the next clip->
 245                                 secondary_stream_idx = next_clip->stream_idx;
 246                                 int64_t in_pts_secondary = lrint(next_clip->pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip->speed);
 247                                 in_pts_secondary_for_progress = in_pts_secondary;
 248                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 249
 250                                 // If more than half-way through the fade, interpolate the next clip
 251                                 // instead of the current one, since it's more visible.
 252                                 if (fade_alpha >= 0.5f) {
 253                                         swap(primary_stream_idx, secondary_stream_idx);
 254                                         swap(in_pts, in_pts_secondary);
 255                                         fade_alpha = 1.0f - fade_alpha;
 256                                 }
 257
 258                                 FrameOnDisk frame_lower, frame_upper;
 259                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 260                                 if (ok) {
 261                                         secondary_frame = frame_lower;
 262                                 }
 263                         }
 264
 265                         // NOTE: None of this will take into account any snapping done below.
 266                         double clip_progress = calc_progress(*clip, in_pts_for_progress);
 267                         map<uint64_t, double> progress{ { clip_list[clip_idx].id, clip_progress } };
 268                         double time_remaining;
 269                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 270                                 double next_clip_progress = calc_progress(*next_clip, in_pts_secondary_for_progress);
 271                                 progress[clip_list[clip_idx + 1].id] = next_clip_progress;
 272                                 time_remaining = compute_time_left(clip_list, clip_idx + 1, next_clip_progress);
 273                         } else {
 274                                 time_remaining = compute_time_left(clip_list, clip_idx, clip_progress);
 275                         }
 276                         if (progress_callback != nullptr) {
 277                                 progress_callback(progress, time_remaining);
 278                         }
 279
 280                         FrameOnDisk frame_lower, frame_upper;
 281                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 282                         if (!ok) {
 283                                 break;
 284                         }
 285
 286                         // Wait until we should, or (given buffering) can, output the frame.
 287                         {
 288                                 unique_lock<mutex> lock(queue_state_mu);
 289                                 if (video_stream == nullptr) {
 290                                         // No queue, just wait until the right time and then show the frame.
 291                                         new_clip_changed.wait_until(lock, next_frame_start, [this] {
 292                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 293                                         });
 294                                         if (should_quit) {
 295                                                 return;
 296                                         }
 297                                 } else {
 298                                         // If the queue is full (which is really the state we'd like to be in),
 299                                         // wait until there's room for one more frame (ie., one was output from
 300                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 301                                         //
 302                                         // In this case, we don't sleep until next_frame_start; the displaying is
 303                                         // done by the queue.
 304                                         new_clip_changed.wait(lock, [this] {
 305                                                 if (num_queued_frames < max_queued_frames) {
 306                                                         return true;
 307                                                 }
 308                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 309                                         });
 310                                 }
 311                                 if (should_quit) {
 312                                         return;
 313                                 }
 314                                 if (new_clip_ready) {
 315                                         if (video_stream != nullptr) {
 316                                                 lock.unlock();  // Urg.
 317                                                 video_stream->clear_queue();
 318                                                 lock.lock();
 319                                         }
 320                                         return;
 321                                 }
 322                                 // Honor if we got an override request for the camera.
 323                                 if (override_stream_idx != -1) {
 324                                         stream_idx = override_stream_idx;
 325                                         override_stream_idx = -1;
 326                                         continue;
 327                                 }
 328                         }
 329
 330                         string subtitle;
 331                         {
 332                                 stringstream ss;
 333                                 ss.imbue(locale("C"));
 334                                 ss.precision(3);
 335                                 ss << "Futatabi " NAGERU_VERSION ";PLAYING;";
 336                                 ss << fixed << time_remaining;
 337                                 ss << ";" << format_duration(time_remaining) << " left";
 338                                 subtitle = ss.str();
 339                         }
 340
 341                         // If there's nothing to interpolate between, or if interpolation is turned off,
 342                         // or we're a preview, then just display the frame.
 343                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0 || video_stream == nullptr) {
 344                                 display_single_frame(primary_stream_idx, frame_lower, secondary_stream_idx,
 345                                                      secondary_frame, fade_alpha, next_frame_start, /*snapped=*/false,
 346                                                      subtitle);
 347                                 continue;
 348                         }
 349
 350                         // Snap to input frame: If we can do so with less than 1% jitter
 351                         // (ie., move less than 1% of an _output_ frame), do so.
 352                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 353                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) / global_flags.output_framerate;
 354                         bool snapped = false;
 355                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 356                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 357                                         display_single_frame(primary_stream_idx, snap_frame, secondary_stream_idx,
 358                                                              secondary_frame, fade_alpha, next_frame_start, /*snapped=*/true,
 359                                                              subtitle);
 360                                         in_pts_origin += snap_frame.pts - in_pts;
 361                                         snapped = true;
 362                                         break;
 363                                 }
 364                         }
 365                         if (snapped) {
 366                                 continue;
 367                         }
 368
 369                         // The snapping above makes us lock to the input framerate, even in the presence
 370                         // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
 371                         // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
 372                         // get a snap very rarely (in the given case, once every 24 output frames), and by
 373                         // that time, we'd have drifted out. We could have solved this by changing the overall
 374                         // speed ever so slightly, but it requires that we know the actual frame rate (which
 375                         // is difficult in the presence of jitter and missed frames), or at least do some kind
 376                         // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
 377                         // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
 378                         // an original frame every other frame; we would also snap to exactly alpha=0.5 every
 379                         // in-between frame. Of course, we will still need to interpolate, but we get a lot
 380                         // closer when we actually get close to an original frame. In other words: Snap more
 381                         // often, but snap less each time. Unless the input and output frame rates are completely
 382                         // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
 383                         // really never see in practice).
 384                         for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
 385                                                  1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
 386                                 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
 387                                 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
 388                                         in_pts_origin += lrint(subsnap_pts) - in_pts;
 389                                         in_pts = lrint(subsnap_pts);
 390                                         break;
 391                                 }
 392                         }
 393
 394                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 395                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 396                                         lrint(1e3 * duration<double>(time_behind).count()));
 397                                 ++metric_dropped_interpolated_frame;
 398                                 continue;
 399                         }
 400
 401                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 402                         auto display_func = [this](shared_ptr<Frame> frame) {
 403                                 if (destination != nullptr) {
 404                                         destination->setFrame(frame);
 405                                 }
 406                         };
 407                         if (secondary_stream_idx == -1) {
 408                                 ++metric_interpolated_frame;
 409                         } else {
 410                                 ++metric_interpolated_faded_frame;
 411                         }
 412                         video_stream->schedule_interpolated_frame(
 413                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 414                                 frame_lower, frame_upper, alpha,
 415                                 secondary_frame, fade_alpha, subtitle);
 416                         last_pts_played = in_pts;  // Not really needed; only previews use last_pts_played.
 417                 }
 418
 419                 // The clip ended.
 420                 if (should_quit) {
 421                         return;
 422                 }
 423
 424                 // Start the next clip from the point where the fade went out.
 425                 if (next_clip != nullptr) {
 426                         origin = next_frame_start;
 427                         in_pts_origin = next_clip->pts_in + lrint(next_clip_fade_time * TIMEBASE * clip->speed);
 428                 }
 429         }
 430
 431         if (done_callback != nullptr) {
 432                 done_callback();
 433         }
 434 }
 435
 436 void Player::display_single_frame(int primary_stream_idx, const FrameOnDisk &primary_frame, int secondary_stream_idx, const FrameOnDisk &secondary_frame, double fade_alpha, steady_clock::time_point frame_start, bool snapped, const std::string &subtitle)
 437 {
 438         auto display_func = [this, primary_stream_idx, primary_frame, secondary_frame, fade_alpha] {
 439                 if (destination != nullptr) {
 440                         destination->setFrame(primary_stream_idx, primary_frame, secondary_frame, fade_alpha);
 441                 }
 442         };
 443         if (video_stream == nullptr) {
 444                 display_func();
 445         } else {
 446                 if (secondary_stream_idx == -1) {
 447                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 448                         if (snapped) {
 449                                 ++metric_original_snapped_frame;
 450                         } else {
 451                                 ++metric_original_frame;
 452                         }
 453                         video_stream->schedule_original_frame(
 454                                 frame_start, pts, display_func, QueueSpotHolder(this),
 455                                 primary_frame, subtitle);
 456                 } else {
 457                         assert(secondary_frame.pts != -1);
 458                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 459                         if (snapped) {
 460                                 ++metric_faded_snapped_frame;
 461                         } else {
 462                                 ++metric_faded_frame;
 463                         }
 464                         video_stream->schedule_faded_frame(frame_start, pts, display_func,
 465                                                            QueueSpotHolder(this), primary_frame,
 466                                                            secondary_frame, fade_alpha, subtitle);
 467                 }
 468         }
 469         last_pts_played = primary_frame.pts;
 470 }
 471
 472 // Find the frame immediately before and after this point.
 473 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 474 {
 475         lock_guard<mutex> lock(frame_mu);
 476
 477         // Find the first frame such that frame.pts >= pts.
 478         auto it = find_last_frame_before(frames[stream_idx], pts);
 479         if (it == frames[stream_idx].end()) {
 480                 return false;
 481         }
 482         *frame_upper = *it;
 483
 484         // Find the last frame such that in_pts <= frame.pts (if any).
 485         if (it == frames[stream_idx].begin()) {
 486                 *frame_lower = *it;
 487         } else {
 488                 *frame_lower = *(it - 1);
 489         }
 490         assert(pts >= frame_lower->pts);
 491         assert(pts <= frame_upper->pts);
 492         return true;
 493 }
 494
 495 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 496         : destination(destination), stream_output(stream_output)
 497 {
 498         player_thread = thread(&Player::thread_func, this, file_avctx);
 499
 500         if (stream_output == HTTPD_STREAM_OUTPUT) {
 501                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_original_frame);
 502                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_faded_frame);
 503                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "snapped" } }, &metric_original_snapped_frame);
 504                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "snapped" } }, &metric_faded_snapped_frame);
 505                 global_metrics.add("http_output_frames", { { "type", "interpolated" } }, &metric_interpolated_frame);
 506                 global_metrics.add("http_output_frames", { { "type", "interpolated_faded" } }, &metric_interpolated_faded_frame);
 507                 global_metrics.add("http_output_frames", { { "type", "refresh" } }, &metric_refresh_frame);
 508                 global_metrics.add("http_dropped_frames", { { "type", "interpolated" } }, &metric_dropped_interpolated_frame);
 509                 global_metrics.add("http_dropped_frames", { { "type", "unconditional" } }, &metric_dropped_unconditional_frame);
 510         }
 511 }
 512
 513 Player::~Player()
 514 {
 515         should_quit = true;
 516         new_clip_changed.notify_all();
 517         player_thread.join();
 518
 519         if (video_stream != nullptr) {
 520                 video_stream->stop();
 521         }
 522 }
 523
 524 void Player::play(const vector<ClipWithID> &clips)
 525 {
 526         lock_guard<mutex> lock(queue_state_mu);
 527         new_clip_ready = true;
 528         queued_clip_list = clips;
 529         splice_ready = false;
 530         override_stream_idx = -1;
 531         new_clip_changed.notify_all();
 532 }
 533
 534 void Player::splice_play(const vector<ClipWithID> &clips)
 535 {
 536         lock_guard<mutex> lock(queue_state_mu);
 537         if (new_clip_ready) {
 538                 queued_clip_list = clips;
 539                 assert(!splice_ready);
 540                 return;
 541         }
 542
 543         splice_ready = true;
 544         to_splice_clip_list = clips;  // Overwrite any queued but not executed splice.
 545 }
 546
 547 void Player::override_angle(unsigned stream_idx)
 548 {
 549         int64_t last_pts;
 550
 551         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 552         {
 553                 lock_guard<mutex> lock(queue_state_mu);
 554                 if (new_clip_ready) {
 555                         assert(queued_clip_list.size() == 1);
 556                         queued_clip_list[0].clip.stream_idx = stream_idx;
 557                         return;
 558                 }
 559
 560                 // If we are playing a clip, set override_stream_idx, and the player thread will
 561                 // pick it up and change its internal index.
 562                 if (playing) {
 563                         override_stream_idx = stream_idx;
 564                         new_clip_changed.notify_all();
 565                         return;
 566                 }
 567
 568                 // OK, so we're standing still, presumably at the end of a clip.
 569                 // Look at the last frame played (if it exists), and show the closest
 570                 // thing we've got.
 571                 if (last_pts_played < 0) {
 572                         return;
 573                 }
 574                 last_pts = last_pts_played;
 575         }
 576
 577         lock_guard<mutex> lock(frame_mu);
 578         auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
 579         if (it == frames[stream_idx].end()) {
 580                 return;
 581         }
 582         destination->setFrame(stream_idx, *it);
 583 }
 584
 585 void Player::take_queue_spot()
 586 {
 587         lock_guard<mutex> lock(queue_state_mu);
 588         ++num_queued_frames;
 589 }
 590
 591 void Player::release_queue_spot()
 592 {
 593         lock_guard<mutex> lock(queue_state_mu);
 594         assert(num_queued_frames > 0);
 595         --num_queued_frames;
 596         new_clip_changed.notify_all();
 597 }
 598
 599 double compute_time_left(const vector<ClipWithID> &clips, size_t currently_playing_idx, double progress_currently_playing)
 600 {
 601         // Look at the last clip and then start counting from there.
 602         double remaining = 0.0;
 603         double last_fade_time_seconds = 0.0;
 604         for (size_t row = currently_playing_idx; row < clips.size(); ++row) {
 605                 const Clip &clip = clips[row].clip;
 606                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 607                 if (row == currently_playing_idx) {
 608                         // A clip we're playing: Subtract the part we've already played.
 609                         remaining = clip_length * (1.0 - progress_currently_playing);
 610                 } else {
 611                         // A clip we haven't played yet: Subtract the part that's overlapping
 612                         // with a previous clip (due to fade).
 613                         remaining += max(clip_length - last_fade_time_seconds, 0.0);
 614                 }
 615                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 616         }
 617         return remaining;
 618 }
 619
 620 string format_duration(double t)
 621 {
 622         int t_ms = lrint(t * 1e3);
 623
 624         int ms = t_ms % 1000;
 625         t_ms /= 1000;
 626         int s = t_ms % 60;
 627         t_ms /= 60;
 628         int m = t_ms;
 629
 630         char buf[256];
 631         snprintf(buf, sizeof(buf), "%d:%02d.%03d", m, s, ms);
 632         return buf;
 633 }