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                 abort();
  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 = start_master_speed;
 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         int64_t slept_pts = duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
 143         if (slept_pts > 0) {
 144                 if (video_stream != nullptr) {
 145                         // Add silence for the time we're waiting.
 146                         video_stream->schedule_silence(steady_clock::now(), pts, slept_pts, QueueSpotHolder());
 147                 }
 148                 pts += slept_pts;
 149         }
 150
 151         if (!clip_ready) {
 152                 if (video_stream != nullptr) {
 153                         ++metric_refresh_frame;
 154                         string subtitle = "Futatabi " NAGERU_VERSION ";PAUSED;0.000;" + pause_status;
 155                         video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder(),
 156                                 subtitle);
 157                 }
 158                 return;
 159         }
 160
 161         should_skip_to_next = false;  // To make sure we don't have a lingering click from before play.
 162         steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
 163         int64_t in_pts_origin = clip_list[0].clip.pts_in;
 164         for (size_t clip_idx = 0; clip_idx < clip_list.size(); ++clip_idx) {
 165                 const Clip *clip = &clip_list[clip_idx].clip;
 166                 const Clip *next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
 167                 int64_t out_pts_origin = pts;
 168
 169                 double next_clip_fade_time = -1.0;
 170                 if (next_clip != nullptr) {
 171                         double duration_this_clip = double(clip->pts_out - in_pts_origin) / TIMEBASE / clip->speed;
 172                         double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
 173                         next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
 174                 }
 175
 176                 int stream_idx = clip->stream_idx;
 177
 178                 // Start playing exactly at a frame.
 179                 // TODO: Snap secondary (fade-to) clips in the same fashion
 180                 // so that we don't get jank here).
 181                 {
 182                         lock_guard<mutex> lock(frame_mu);
 183
 184                         // Find the first frame such that frame.pts <= in_pts.
 185                         auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
 186                         if (it != frames[stream_idx].end()) {
 187                                 in_pts_origin = it->pts;
 188                         }
 189                 }
 190
 191                 steady_clock::time_point next_frame_start;
 192                 for (int64_t frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 193                         double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
 194                         next_frame_start =
 195                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 196                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip->speed * master_speed / global_flags.output_framerate);
 197                         pts = lrint(out_pts);
 198
 199                         float new_master_speed = change_master_speed.exchange(0.0f / 0.0f);
 200                         if (!std::isnan(new_master_speed)) {
 201                                 master_speed = new_master_speed;
 202                                 in_pts_origin = in_pts - TIMEBASE * frameno * clip->speed * master_speed / global_flags.output_framerate;
 203                                 out_pts_origin = out_pts - TIMEBASE * frameno / global_flags.output_framerate;
 204                         }
 205
 206                         if (should_skip_to_next.exchange(false)) {  // Test and clear.
 207                                 Clip *clip = &clip_list[clip_idx].clip;  // Get a non-const pointer.
 208                                 clip->pts_out = std::min<int64_t>(clip->pts_out, llrint(in_pts + clip->fade_time_seconds * clip->speed * TIMEBASE));
 209                         }
 210
 211                         if (in_pts >= clip->pts_out) {
 212                                 break;
 213                         }
 214
 215                         // Only play audio if we're within 0.1% of normal speed. We could do
 216                         // stretching or pitch shift later if it becomes needed.
 217                         bool play_audio = clip->speed * master_speed >= 0.999 && clip->speed * master_speed <= 1.001;
 218
 219                         {
 220                                 lock_guard<mutex> lock(queue_state_mu);
 221                                 if (splice_ready) {
 222                                         if (next_clip == nullptr) {
 223                                                 do_splice(to_splice_clip_list, clip_idx, -1, &clip_list);
 224                                         } else {
 225                                                 do_splice(to_splice_clip_list, clip_idx, clip_idx + 1, &clip_list);
 226                                         }
 227                                         to_splice_clip_list.clear();
 228                                         splice_ready = false;
 229
 230                                         // Refresh the clip pointer, since the clip list may have been reallocated.
 231                                         clip = &clip_list[clip_idx].clip;
 232
 233                                         // Recompute next_clip and any needed fade times, since the next clip may have changed
 234                                         // (or we may have gone from no new clip to having one, or the other way).
 235                                         next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
 236                                         if (next_clip != nullptr) {
 237                                                 double duration_this_clip = double(clip->pts_out - in_pts) / TIMEBASE / clip->speed;
 238                                                 double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
 239                                                 next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
 240                                         }
 241                                 }
 242                         }
 243
 244                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 245                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
 246                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 247                                         lrint(1e3 * duration<double>(time_behind).count()));
 248                                 ++metric_dropped_unconditional_frame;
 249                                 continue;
 250                         }
 251
 252                         // pts not affected by the swapping below.
 253                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 254
 255                         int primary_stream_idx = stream_idx;
 256                         FrameOnDisk secondary_frame;
 257                         int secondary_stream_idx = -1;
 258                         float fade_alpha = 0.0f;
 259                         double time_left_this_clip = double(clip->pts_out - in_pts) / TIMEBASE / clip->speed;
 260                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 261                                 // We're in a fade to the next clip->
 262                                 secondary_stream_idx = next_clip->stream_idx;
 263                                 int64_t in_pts_secondary = lrint(next_clip->pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip->speed);
 264                                 in_pts_secondary_for_progress = in_pts_secondary;
 265                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 266
 267                                 // If more than half-way through the fade, interpolate the next clip
 268                                 // instead of the current one, since it's more visible.
 269                                 if (fade_alpha >= 0.5f) {
 270                                         swap(primary_stream_idx, secondary_stream_idx);
 271                                         swap(in_pts, in_pts_secondary);
 272                                         fade_alpha = 1.0f - fade_alpha;
 273                                 }
 274
 275                                 FrameOnDisk frame_lower, frame_upper;
 276                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 277                                 if (ok) {
 278                                         secondary_frame = frame_lower;
 279                                 }
 280                         }
 281
 282                         // NOTE: None of this will take into account any snapping done below.
 283                         double clip_progress = calc_progress(*clip, in_pts_for_progress);
 284                         map<uint64_t, double> progress{ { clip_list[clip_idx].id, clip_progress } };
 285                         TimeRemaining time_remaining;
 286                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 287                                 double next_clip_progress = calc_progress(*next_clip, in_pts_secondary_for_progress);
 288                                 progress[clip_list[clip_idx + 1].id] = next_clip_progress;
 289                                 time_remaining = compute_time_left(clip_list, clip_idx + 1, next_clip_progress);
 290                         } else {
 291                                 time_remaining = compute_time_left(clip_list, clip_idx, clip_progress);
 292                         }
 293                         if (progress_callback != nullptr) {
 294                                 progress_callback(progress, time_remaining);
 295                         }
 296
 297                         FrameOnDisk frame_lower, frame_upper;
 298                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 299                         if (!ok) {
 300                                 break;
 301                         }
 302
 303                         // Wait until we should, or (given buffering) can, output the frame.
 304                         {
 305                                 unique_lock<mutex> lock(queue_state_mu);
 306                                 if (video_stream == nullptr) {
 307                                         // No queue, just wait until the right time and then show the frame.
 308                                         new_clip_changed.wait_until(lock, next_frame_start, [this] {
 309                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 310                                         });
 311                                         if (should_quit) {
 312                                                 return;
 313                                         }
 314                                 } else {
 315                                         // If the queue is full (which is really the state we'd like to be in),
 316                                         // wait until there's room for one more frame (ie., one was output from
 317                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 318                                         //
 319                                         // In this case, we don't sleep until next_frame_start; the displaying is
 320                                         // done by the queue.
 321                                         new_clip_changed.wait(lock, [this] {
 322                                                 if (num_queued_frames < max_queued_frames) {
 323                                                         return true;
 324                                                 }
 325                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 326                                         });
 327                                 }
 328                                 if (should_quit) {
 329                                         return;
 330                                 }
 331                                 if (new_clip_ready) {
 332                                         if (video_stream != nullptr) {
 333                                                 lock.unlock();  // Urg.
 334                                                 video_stream->clear_queue();
 335                                                 lock.lock();
 336                                         }
 337                                         return;
 338                                 }
 339                                 // Honor if we got an override request for the camera.
 340                                 if (override_stream_idx != -1) {
 341                                         stream_idx = override_stream_idx;
 342                                         override_stream_idx = -1;
 343                                         continue;
 344                                 }
 345                         }
 346
 347                         string subtitle;
 348                         {
 349                                 stringstream ss;
 350                                 ss.imbue(locale("C"));
 351                                 ss.precision(3);
 352                                 ss << "Futatabi " NAGERU_VERSION ";PLAYING;";
 353                                 ss << fixed << (time_remaining.num_infinite * 86400.0 + time_remaining.t);
 354                                 ss << ";" << format_duration(time_remaining) << " left";
 355                                 subtitle = ss.str();
 356                         }
 357
 358                         // Snap to input frame: If we can do so with less than 1% jitter
 359                         // (ie., move less than 1% of an _output_ frame), do so.
 360                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 361                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) * clip->speed / global_flags.output_framerate;
 362                         bool snapped = false;
 363                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 364                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 365                                         display_single_frame(primary_stream_idx, snap_frame, secondary_stream_idx,
 366                                                              secondary_frame, fade_alpha, next_frame_start, /*snapped=*/true,
 367                                                              subtitle, play_audio);
 368                                         in_pts_origin += snap_frame.pts - in_pts;
 369                                         snapped = true;
 370                                         break;
 371                                 }
 372                         }
 373                         if (snapped) {
 374                                 continue;
 375                         }
 376
 377                         // If there's nothing to interpolate between, or if interpolation is turned off,
 378                         // or we're a preview, then just display the frame.
 379                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0 || video_stream == nullptr) {
 380                                 display_single_frame(primary_stream_idx, frame_lower, secondary_stream_idx,
 381                                                      secondary_frame, fade_alpha, next_frame_start, /*snapped=*/false,
 382                                                      subtitle, play_audio);
 383                                 continue;
 384                         }
 385
 386                         // The snapping above makes us lock to the input framerate, even in the presence
 387                         // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
 388                         // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
 389                         // get a snap very rarely (in the given case, once every 24 output frames), and by
 390                         // that time, we'd have drifted out. We could have solved this by changing the overall
 391                         // speed ever so slightly, but it requires that we know the actual frame rate (which
 392                         // is difficult in the presence of jitter and missed frames), or at least do some kind
 393                         // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
 394                         // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
 395                         // an original frame every other frame; we would also snap to exactly alpha=0.5 every
 396                         // in-between frame. Of course, we will still need to interpolate, but we get a lot
 397                         // closer when we actually get close to an original frame. In other words: Snap more
 398                         // often, but snap less each time. Unless the input and output frame rates are completely
 399                         // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
 400                         // really never see in practice).
 401                         for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
 402                                                  1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
 403                                 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
 404                                 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
 405                                         in_pts_origin += lrint(subsnap_pts) - in_pts;
 406                                         in_pts = lrint(subsnap_pts);
 407                                         break;
 408                                 }
 409                         }
 410
 411                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 412                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 413                                         lrint(1e3 * duration<double>(time_behind).count()));
 414                                 ++metric_dropped_interpolated_frame;
 415                                 continue;
 416                         }
 417
 418                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 419                         auto display_func = [this](shared_ptr<Frame> frame) {
 420                                 if (destination != nullptr) {
 421                                         destination->setFrame(frame);
 422                                 }
 423                         };
 424                         if (secondary_stream_idx == -1) {
 425                                 ++metric_interpolated_frame;
 426                         } else {
 427                                 ++metric_interpolated_faded_frame;
 428                         }
 429                         video_stream->schedule_interpolated_frame(
 430                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 431                                 frame_lower, frame_upper, alpha,
 432                                 secondary_frame, fade_alpha, subtitle, play_audio);
 433                         last_pts_played = in_pts;  // Not really needed; only previews use last_pts_played.
 434                 }
 435
 436                 // The clip ended.
 437                 if (should_quit) {
 438                         return;
 439                 }
 440
 441                 // Start the next clip from the point where the fade went out.
 442                 if (next_clip != nullptr) {
 443                         origin = next_frame_start;
 444                         in_pts_origin = next_clip->pts_in + lrint(next_clip_fade_time * TIMEBASE * clip->speed);
 445                 }
 446         }
 447
 448         if (done_callback != nullptr) {
 449                 done_callback();
 450         }
 451 }
 452
 453 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, bool play_audio)
 454 {
 455         auto display_func = [this, primary_stream_idx, primary_frame, secondary_frame, fade_alpha] {
 456                 if (destination != nullptr) {
 457                         destination->setFrame(primary_stream_idx, primary_frame, secondary_frame, fade_alpha);
 458                 }
 459         };
 460         if (video_stream == nullptr) {
 461                 display_func();
 462         } else {
 463                 if (secondary_stream_idx == -1) {
 464                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 465                         if (snapped) {
 466                                 ++metric_original_snapped_frame;
 467                         } else {
 468                                 ++metric_original_frame;
 469                         }
 470                         video_stream->schedule_original_frame(
 471                                 frame_start, pts, display_func, QueueSpotHolder(this),
 472                                 primary_frame, subtitle, play_audio);
 473                 } else {
 474                         assert(secondary_frame.pts != -1);
 475                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 476                         if (snapped) {
 477                                 ++metric_faded_snapped_frame;
 478                         } else {
 479                                 ++metric_faded_frame;
 480                         }
 481                         video_stream->schedule_faded_frame(frame_start, pts, display_func,
 482                                                            QueueSpotHolder(this), primary_frame,
 483                                                            secondary_frame, fade_alpha, subtitle);
 484                 }
 485         }
 486         last_pts_played = primary_frame.pts;
 487 }
 488
 489 // Find the frame immediately before and after this point.
 490 // If we have an exact match, return it immediately.
 491 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 492 {
 493         lock_guard<mutex> lock(frame_mu);
 494
 495         // Find the first frame such that frame.pts >= pts.
 496         auto it = find_last_frame_before(frames[stream_idx], pts);
 497         if (it == frames[stream_idx].end()) {
 498                 return false;
 499         }
 500         *frame_upper = *it;
 501
 502         // If we have an exact match, return it immediately.
 503         if (frame_upper->pts == pts) {
 504                 *frame_lower = *it;
 505                 return true;
 506         }
 507
 508         // Find the last frame such that in_pts <= frame.pts (if any).
 509         if (it == frames[stream_idx].begin()) {
 510                 *frame_lower = *it;
 511         } else {
 512                 *frame_lower = *(it - 1);
 513         }
 514         assert(pts >= frame_lower->pts);
 515         assert(pts <= frame_upper->pts);
 516         return true;
 517 }
 518
 519 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 520         : destination(destination), stream_output(stream_output)
 521 {
 522         player_thread = thread(&Player::thread_func, this, file_avctx);
 523
 524         if (stream_output == HTTPD_STREAM_OUTPUT) {
 525                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_original_frame);
 526                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_faded_frame);
 527                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "snapped" } }, &metric_original_snapped_frame);
 528                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "snapped" } }, &metric_faded_snapped_frame);
 529                 global_metrics.add("http_output_frames", { { "type", "interpolated" } }, &metric_interpolated_frame);
 530                 global_metrics.add("http_output_frames", { { "type", "interpolated_faded" } }, &metric_interpolated_faded_frame);
 531                 global_metrics.add("http_output_frames", { { "type", "refresh" } }, &metric_refresh_frame);
 532                 global_metrics.add("http_dropped_frames", { { "type", "interpolated" } }, &metric_dropped_interpolated_frame);
 533                 global_metrics.add("http_dropped_frames", { { "type", "unconditional" } }, &metric_dropped_unconditional_frame);
 534         }
 535 }
 536
 537 Player::~Player()
 538 {
 539         should_quit = true;
 540         new_clip_changed.notify_all();
 541         player_thread.join();
 542
 543         if (video_stream != nullptr) {
 544                 video_stream->stop();
 545         }
 546 }
 547
 548 void Player::play(const vector<ClipWithID> &clips)
 549 {
 550         lock_guard<mutex> lock(queue_state_mu);
 551         new_clip_ready = true;
 552         queued_clip_list = clips;
 553         splice_ready = false;
 554         override_stream_idx = -1;
 555         new_clip_changed.notify_all();
 556 }
 557
 558 void Player::splice_play(const vector<ClipWithID> &clips)
 559 {
 560         lock_guard<mutex> lock(queue_state_mu);
 561         if (new_clip_ready) {
 562                 queued_clip_list = clips;
 563                 assert(!splice_ready);
 564                 return;
 565         }
 566
 567         splice_ready = true;
 568         to_splice_clip_list = clips;  // Overwrite any queued but not executed splice.
 569 }
 570
 571 void Player::override_angle(unsigned stream_idx)
 572 {
 573         int64_t last_pts;
 574
 575         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 576         {
 577                 lock_guard<mutex> lock(queue_state_mu);
 578                 if (new_clip_ready) {
 579                         assert(queued_clip_list.size() == 1);
 580                         queued_clip_list[0].clip.stream_idx = stream_idx;
 581                         return;
 582                 }
 583
 584                 // If we are playing a clip, set override_stream_idx, and the player thread will
 585                 // pick it up and change its internal index.
 586                 if (playing) {
 587                         override_stream_idx = stream_idx;
 588                         new_clip_changed.notify_all();
 589                         return;
 590                 }
 591
 592                 // OK, so we're standing still, presumably at the end of a clip.
 593                 // Look at the last frame played (if it exists), and show the closest
 594                 // thing we've got.
 595                 if (last_pts_played < 0) {
 596                         return;
 597                 }
 598                 last_pts = last_pts_played;
 599         }
 600
 601         lock_guard<mutex> lock(frame_mu);
 602         auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
 603         if (it == frames[stream_idx].end()) {
 604                 return;
 605         }
 606         destination->setFrame(stream_idx, *it);
 607 }
 608
 609 void Player::take_queue_spot()
 610 {
 611         lock_guard<mutex> lock(queue_state_mu);
 612         ++num_queued_frames;
 613 }
 614
 615 void Player::release_queue_spot()
 616 {
 617         lock_guard<mutex> lock(queue_state_mu);
 618         assert(num_queued_frames > 0);
 619         --num_queued_frames;
 620         new_clip_changed.notify_all();
 621 }
 622
 623 TimeRemaining compute_time_left(const vector<ClipWithID> &clips, size_t currently_playing_idx, double progress_currently_playing)
 624 {
 625         // Look at the last clip and then start counting from there.
 626         TimeRemaining remaining { 0, 0.0 };
 627         double last_fade_time_seconds = 0.0;
 628         for (size_t row = currently_playing_idx; row < clips.size(); ++row) {
 629                 const Clip &clip = clips[row].clip;
 630                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 631                 if (clip_length >= 86400.0 || clip.pts_out == -1) {  // More than one day.
 632                         ++remaining.num_infinite;
 633                 } else {
 634                         if (row == currently_playing_idx) {
 635                                 // A clip we're playing: Subtract the part we've already played.
 636                                 remaining.t = clip_length * (1.0 - progress_currently_playing);
 637                         } else {
 638                                 // A clip we haven't played yet: Subtract the part that's overlapping
 639                                 // with a previous clip (due to fade).
 640                                 remaining.t += max(clip_length - last_fade_time_seconds, 0.0);
 641                         }
 642                 }
 643                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 644         }
 645         return remaining;
 646 }
 647
 648 string format_duration(TimeRemaining t)
 649 {
 650         int t_ms = lrint(t.t * 1e3);
 651
 652         int ms = t_ms % 1000;
 653         t_ms /= 1000;
 654         int s = t_ms % 60;
 655         t_ms /= 60;
 656         int m = t_ms;
 657
 658         char buf[256];
 659         if (t.num_infinite > 1 && t.t > 0.0) {
 660                 snprintf(buf, sizeof(buf), "%zu clips + %d:%02d.%03d", t.num_infinite, m, s, ms);
 661         } else if (t.num_infinite > 1) {
 662                 snprintf(buf, sizeof(buf), "%zu clips", t.num_infinite);
 663         } else if (t.num_infinite == 1 && t.t > 0.0) {
 664                 snprintf(buf, sizeof(buf), "%zu clip + %d:%02d.%03d", t.num_infinite, m, s, ms);
 665         } else if (t.num_infinite == 1) {
 666                 snprintf(buf, sizeof(buf), "%zu clip", t.num_infinite);
 667         } else {
 668                 snprintf(buf, sizeof(buf), "%d:%02d.%03d", m, s, ms);
 669         }
 670         return buf;
 671 }