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
 278                                 if (ok) {
 279                                         secondary_frame = frame_lower;
 280                                 } else {
 281                                         secondary_stream_idx = -1;
 282                                 }
 283                         }
 284
 285                         // NOTE: None of this will take into account any snapping done below.
 286                         double clip_progress = calc_progress(*clip, in_pts_for_progress);
 287                         map<uint64_t, double> progress{ { clip_list[clip_idx].id, clip_progress } };
 288                         TimeRemaining time_remaining;
 289                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 290                                 double next_clip_progress = calc_progress(*next_clip, in_pts_secondary_for_progress);
 291                                 progress[clip_list[clip_idx + 1].id] = next_clip_progress;
 292                                 time_remaining = compute_time_left(clip_list, clip_idx + 1, next_clip_progress);
 293                         } else {
 294                                 time_remaining = compute_time_left(clip_list, clip_idx, clip_progress);
 295                         }
 296                         if (progress_callback != nullptr) {
 297                                 progress_callback(progress, time_remaining);
 298                         }
 299
 300                         FrameOnDisk frame_lower, frame_upper;
 301                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 302                         if (!ok) {
 303                                 break;
 304                         }
 305
 306                         // Wait until we should, or (given buffering) can, output the frame.
 307                         {
 308                                 unique_lock<mutex> lock(queue_state_mu);
 309                                 if (video_stream == nullptr) {
 310                                         // No queue, just wait until the right time and then show the frame.
 311                                         new_clip_changed.wait_until(lock, next_frame_start, [this] {
 312                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 313                                         });
 314                                         if (should_quit) {
 315                                                 return;
 316                                         }
 317                                 } else {
 318                                         // If the queue is full (which is really the state we'd like to be in),
 319                                         // wait until there's room for one more frame (ie., one was output from
 320                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 321                                         //
 322                                         // In this case, we don't sleep until next_frame_start; the displaying is
 323                                         // done by the queue.
 324                                         new_clip_changed.wait(lock, [this] {
 325                                                 if (num_queued_frames < max_queued_frames) {
 326                                                         return true;
 327                                                 }
 328                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 329                                         });
 330                                 }
 331                                 if (should_quit) {
 332                                         return;
 333                                 }
 334                                 if (new_clip_ready) {
 335                                         if (video_stream != nullptr) {
 336                                                 lock.unlock();  // Urg.
 337                                                 video_stream->clear_queue();
 338                                                 lock.lock();
 339                                         }
 340                                         return;
 341                                 }
 342                                 // Honor if we got an override request for the camera.
 343                                 if (override_stream_idx != -1) {
 344                                         stream_idx = override_stream_idx;
 345                                         override_stream_idx = -1;
 346                                         continue;
 347                                 }
 348                         }
 349
 350                         string subtitle;
 351                         {
 352                                 stringstream ss;
 353                                 ss.imbue(locale("C"));
 354                                 ss.precision(3);
 355                                 ss << "Futatabi " NAGERU_VERSION ";PLAYING;";
 356                                 ss << fixed << (time_remaining.num_infinite * 86400.0 + time_remaining.t);
 357                                 ss << ";" << format_duration(time_remaining) << " left";
 358                                 subtitle = ss.str();
 359                         }
 360
 361                         // Snap to input frame: If we can do so with less than 1% jitter
 362                         // (ie., move less than 1% of an _output_ frame), do so.
 363                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 364                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) * clip->speed / global_flags.output_framerate;
 365                         bool snapped = false;
 366                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 367                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 368                                         display_single_frame(primary_stream_idx, snap_frame, secondary_stream_idx,
 369                                                              secondary_frame, fade_alpha, next_frame_start, /*snapped=*/true,
 370                                                              subtitle, play_audio);
 371                                         in_pts_origin += snap_frame.pts - in_pts;
 372                                         snapped = true;
 373                                         break;
 374                                 }
 375                         }
 376                         if (snapped) {
 377                                 continue;
 378                         }
 379
 380                         // If there's nothing to interpolate between, or if interpolation is turned off,
 381                         // or we're a preview, then just display the frame.
 382                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0 || video_stream == nullptr) {
 383                                 display_single_frame(primary_stream_idx, frame_lower, secondary_stream_idx,
 384                                                      secondary_frame, fade_alpha, next_frame_start, /*snapped=*/false,
 385                                                      subtitle, play_audio);
 386                                 continue;
 387                         }
 388
 389                         // The snapping above makes us lock to the input framerate, even in the presence
 390                         // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
 391                         // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
 392                         // get a snap very rarely (in the given case, once every 24 output frames), and by
 393                         // that time, we'd have drifted out. We could have solved this by changing the overall
 394                         // speed ever so slightly, but it requires that we know the actual frame rate (which
 395                         // is difficult in the presence of jitter and missed frames), or at least do some kind
 396                         // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
 397                         // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
 398                         // an original frame every other frame; we would also snap to exactly alpha=0.5 every
 399                         // in-between frame. Of course, we will still need to interpolate, but we get a lot
 400                         // closer when we actually get close to an original frame. In other words: Snap more
 401                         // often, but snap less each time. Unless the input and output frame rates are completely
 402                         // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
 403                         // really never see in practice).
 404                         for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
 405                                                  1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
 406                                 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
 407                                 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
 408                                         in_pts_origin += lrint(subsnap_pts) - in_pts;
 409                                         in_pts = lrint(subsnap_pts);
 410                                         break;
 411                                 }
 412                         }
 413
 414                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 415                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 416                                         lrint(1e3 * duration<double>(time_behind).count()));
 417                                 ++metric_dropped_interpolated_frame;
 418                                 continue;
 419                         }
 420
 421                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 422                         auto display_func = [this](shared_ptr<Frame> frame) {
 423                                 if (destination != nullptr) {
 424                                         destination->setFrame(frame);
 425                                 }
 426                         };
 427                         if (secondary_stream_idx == -1) {
 428                                 ++metric_interpolated_frame;
 429                         } else {
 430                                 ++metric_interpolated_faded_frame;
 431                         }
 432                         video_stream->schedule_interpolated_frame(
 433                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 434                                 frame_lower, frame_upper, alpha,
 435                                 secondary_frame, fade_alpha, subtitle, play_audio);
 436                         last_pts_played = in_pts;  // Not really needed; only previews use last_pts_played.
 437                 }
 438
 439                 // The clip ended.
 440                 if (should_quit) {
 441                         return;
 442                 }
 443
 444                 // Start the next clip from the point where the fade went out.
 445                 if (next_clip != nullptr) {
 446                         origin = next_frame_start;
 447                         in_pts_origin = next_clip->pts_in + lrint(next_clip_fade_time * TIMEBASE * clip->speed);
 448                 }
 449         }
 450
 451         if (done_callback != nullptr) {
 452                 done_callback();
 453         }
 454 }
 455
 456 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)
 457 {
 458         auto display_func = [this, primary_stream_idx, primary_frame, secondary_frame, fade_alpha] {
 459                 if (destination != nullptr) {
 460                         destination->setFrame(primary_stream_idx, primary_frame, secondary_frame, fade_alpha);
 461                 }
 462         };
 463         if (video_stream == nullptr) {
 464                 display_func();
 465         } else {
 466                 if (secondary_stream_idx == -1) {
 467                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 468                         if (snapped) {
 469                                 ++metric_original_snapped_frame;
 470                         } else {
 471                                 ++metric_original_frame;
 472                         }
 473                         video_stream->schedule_original_frame(
 474                                 frame_start, pts, display_func, QueueSpotHolder(this),
 475                                 primary_frame, subtitle, play_audio);
 476                 } else {
 477                         assert(secondary_frame.pts != -1);
 478                         // NOTE: We could be increasing unused metrics for previews, but that's harmless.
 479                         if (snapped) {
 480                                 ++metric_faded_snapped_frame;
 481                         } else {
 482                                 ++metric_faded_frame;
 483                         }
 484                         video_stream->schedule_faded_frame(frame_start, pts, display_func,
 485                                                            QueueSpotHolder(this), primary_frame,
 486                                                            secondary_frame, fade_alpha, subtitle);
 487                 }
 488         }
 489         last_pts_played = primary_frame.pts;
 490 }
 491
 492 // Find the frame immediately before and after this point.
 493 // If we have an exact match, return it immediately.
 494 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 495 {
 496         lock_guard<mutex> lock(frame_mu);
 497
 498         // Find the first frame such that frame.pts >= pts.
 499         auto it = find_last_frame_before(frames[stream_idx], pts);
 500         if (it == frames[stream_idx].end()) {
 501                 return false;
 502         }
 503         *frame_upper = *it;
 504
 505         // If we have an exact match, return it immediately.
 506         if (frame_upper->pts == pts) {
 507                 *frame_lower = *it;
 508                 return true;
 509         }
 510
 511         // Find the last frame such that in_pts <= frame.pts (if any).
 512         if (it == frames[stream_idx].begin()) {
 513                 *frame_lower = *it;
 514         } else {
 515                 *frame_lower = *(it - 1);
 516         }
 517         assert(pts >= frame_lower->pts);
 518         assert(pts <= frame_upper->pts);
 519         return true;
 520 }
 521
 522 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 523         : destination(destination), stream_output(stream_output)
 524 {
 525         player_thread = thread(&Player::thread_func, this, file_avctx);
 526
 527         if (stream_output == HTTPD_STREAM_OUTPUT) {
 528                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_original_frame);
 529                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_faded_frame);
 530                 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "snapped" } }, &metric_original_snapped_frame);
 531                 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "snapped" } }, &metric_faded_snapped_frame);
 532                 global_metrics.add("http_output_frames", { { "type", "interpolated" } }, &metric_interpolated_frame);
 533                 global_metrics.add("http_output_frames", { { "type", "interpolated_faded" } }, &metric_interpolated_faded_frame);
 534                 global_metrics.add("http_output_frames", { { "type", "refresh" } }, &metric_refresh_frame);
 535                 global_metrics.add("http_dropped_frames", { { "type", "interpolated" } }, &metric_dropped_interpolated_frame);
 536                 global_metrics.add("http_dropped_frames", { { "type", "unconditional" } }, &metric_dropped_unconditional_frame);
 537         }
 538 }
 539
 540 Player::~Player()
 541 {
 542         should_quit = true;
 543         new_clip_changed.notify_all();
 544         player_thread.join();
 545
 546         if (video_stream != nullptr) {
 547                 video_stream->stop();
 548         }
 549 }
 550
 551 void Player::play(const vector<ClipWithID> &clips)
 552 {
 553         lock_guard<mutex> lock(queue_state_mu);
 554         new_clip_ready = true;
 555         queued_clip_list = clips;
 556         splice_ready = false;
 557         override_stream_idx = -1;
 558         new_clip_changed.notify_all();
 559 }
 560
 561 void Player::splice_play(const vector<ClipWithID> &clips)
 562 {
 563         lock_guard<mutex> lock(queue_state_mu);
 564         if (new_clip_ready) {
 565                 queued_clip_list = clips;
 566                 assert(!splice_ready);
 567                 return;
 568         }
 569
 570         splice_ready = true;
 571         to_splice_clip_list = clips;  // Overwrite any queued but not executed splice.
 572 }
 573
 574 void Player::override_angle(unsigned stream_idx)
 575 {
 576         int64_t last_pts;
 577
 578         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 579         {
 580                 lock_guard<mutex> lock(queue_state_mu);
 581                 if (new_clip_ready) {
 582                         assert(queued_clip_list.size() == 1);
 583                         queued_clip_list[0].clip.stream_idx = stream_idx;
 584                         return;
 585                 }
 586
 587                 // If we are playing a clip, set override_stream_idx, and the player thread will
 588                 // pick it up and change its internal index.
 589                 if (playing) {
 590                         override_stream_idx = stream_idx;
 591                         new_clip_changed.notify_all();
 592                         return;
 593                 }
 594
 595                 // OK, so we're standing still, presumably at the end of a clip.
 596                 // Look at the last frame played (if it exists), and show the closest
 597                 // thing we've got.
 598                 if (last_pts_played < 0) {
 599                         return;
 600                 }
 601                 last_pts = last_pts_played;
 602         }
 603
 604         lock_guard<mutex> lock(frame_mu);
 605         auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
 606         if (it == frames[stream_idx].end()) {
 607                 return;
 608         }
 609         destination->setFrame(stream_idx, *it);
 610 }
 611
 612 void Player::take_queue_spot()
 613 {
 614         lock_guard<mutex> lock(queue_state_mu);
 615         ++num_queued_frames;
 616 }
 617
 618 void Player::release_queue_spot()
 619 {
 620         lock_guard<mutex> lock(queue_state_mu);
 621         assert(num_queued_frames > 0);
 622         --num_queued_frames;
 623         new_clip_changed.notify_all();
 624 }
 625
 626 TimeRemaining compute_time_left(const vector<ClipWithID> &clips, size_t currently_playing_idx, double progress_currently_playing)
 627 {
 628         // Look at the last clip and then start counting from there.
 629         TimeRemaining remaining { 0, 0.0 };
 630         double last_fade_time_seconds = 0.0;
 631         for (size_t row = currently_playing_idx; row < clips.size(); ++row) {
 632                 const Clip &clip = clips[row].clip;
 633                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 634                 if (clip_length >= 86400.0 || clip.pts_out == -1) {  // More than one day.
 635                         ++remaining.num_infinite;
 636                 } else {
 637                         if (row == currently_playing_idx) {
 638                                 // A clip we're playing: Subtract the part we've already played.
 639                                 remaining.t = clip_length * (1.0 - progress_currently_playing);
 640                         } else {
 641                                 // A clip we haven't played yet: Subtract the part that's overlapping
 642                                 // with a previous clip (due to fade).
 643                                 remaining.t += max(clip_length - last_fade_time_seconds, 0.0);
 644                         }
 645                 }
 646                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 647         }
 648         return remaining;
 649 }
 650
 651 string format_duration(TimeRemaining t)
 652 {
 653         int t_ms = lrint(t.t * 1e3);
 654
 655         int ms = t_ms % 1000;
 656         t_ms /= 1000;
 657         int s = t_ms % 60;
 658         t_ms /= 60;
 659         int m = t_ms;
 660
 661         char buf[256];
 662         if (t.num_infinite > 1 && t.t > 0.0) {
 663                 snprintf(buf, sizeof(buf), "%zu clips + %d:%02d.%03d", t.num_infinite, m, s, ms);
 664         } else if (t.num_infinite > 1) {
 665                 snprintf(buf, sizeof(buf), "%zu clips", t.num_infinite);
 666         } else if (t.num_infinite == 1 && t.t > 0.0) {
 667                 snprintf(buf, sizeof(buf), "%zu clip + %d:%02d.%03d", t.num_infinite, m, s, ms);
 668         } else if (t.num_infinite == 1) {
 669                 snprintf(buf, sizeof(buf), "%zu clip", t.num_infinite);
 670         } else {
 671                 snprintf(buf, sizeof(buf), "%d:%02d.%03d", m, s, ms);
 672         }
 673         return buf;
 674 }