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"
18 #include <condition_variable>
19 #include <movit/util.h>
26 using namespace std::chrono;
28 extern HTTPD *global_httpd;
30 void Player::thread_func(AVFormatContext *file_avctx)
32 pthread_setname_np(pthread_self(), "Player");
34 QSurface *surface = create_surface();
35 QOpenGLContext *context = create_context(surface);
36 if (!make_current(context, surface)) {
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();
51 while (!should_quit) {
58 double calc_progress(const Clip &clip, int64_t pts)
60 return double(pts - clip.pts_in) / (clip.pts_out - clip.pts_in);
63 void do_splice(const vector<ClipWithID> &new_list, size_t playing_index1, ssize_t playing_index2, vector<ClipWithID> *old_list)
65 assert(playing_index2 == -1 || size_t(playing_index2) == playing_index1 + 1);
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;
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.
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);
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;
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.
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());
109 // Keeps track of the various timelines (wall clock time, output pts,
110 // position in the clip we are playing). Generally we keep an origin
111 // and assume we increase linearly from there; the intention is to
112 // avoid getting compounded accuracy errors, although with double,
113 // that is perhaps overkill. (Whenever we break the linear assumption,
114 // we need to reset said origin.)
115 class TimelineTracker
119 steady_clock::time_point wallclock_time;
125 TimelineTracker(double master_speed, int64_t out_pts_origin)
126 : master_speed(master_speed), last_out_pts(out_pts_origin) {
127 origin.out_pts = out_pts_origin;
130 void new_clip(steady_clock::time_point wallclock_origin, const Clip *clip, int64_t start_pts_offset)
133 origin.wallclock_time = wallclock_origin;
134 origin.in_pts = clip->pts_in + start_pts_offset;
135 origin.out_pts = last_out_pts;
139 // Returns the current time for said frame.
140 Instant advance_to_frame(int64_t frameno);
142 int64_t get_in_pts_origin() const { return origin.in_pts; }
143 bool playing_at_normal_speed() const {
144 const double effective_speed = clip->speed * master_speed;
145 return effective_speed >= 0.999 && effective_speed <= 1.001;
148 void snap_by(int64_t offset) {
149 origin.in_pts += offset;
152 void change_master_speed(double new_master_speed, Instant now);
156 const Clip *clip = nullptr;
158 int64_t last_out_pts;
161 TimelineTracker::Instant TimelineTracker::advance_to_frame(int64_t frameno)
164 double in_pts_double = origin.in_pts + TIMEBASE * clip->speed * (frameno - origin.frameno) * master_speed / global_flags.output_framerate;
165 ret.in_pts = lrint(in_pts_double);
166 double out_pts_double = origin.out_pts + TIMEBASE * (frameno - origin.frameno) / global_flags.output_framerate;
167 ret.out_pts = lrint(out_pts_double);
168 ret.wallclock_time = origin.wallclock_time + microseconds(lrint((out_pts_double - origin.out_pts) * 1e6 / TIMEBASE));
169 ret.frameno = frameno;
171 last_out_pts = ret.out_pts;
176 void TimelineTracker::change_master_speed(double new_master_speed, Instant now)
178 master_speed = new_master_speed;
180 // Reset the origins, since the calculations depend on linear interpolation
181 // based on the master speed.
187 void Player::play_playlist_once()
189 vector<ClipWithID> clip_list;
191 steady_clock::time_point before_sleep = steady_clock::now();
194 // Wait until we're supposed to play something.
196 unique_lock<mutex> lock(queue_state_mu);
198 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
199 return should_quit || new_clip_ready;
205 new_clip_ready = false;
207 clip_list = move(queued_clip_list);
208 queued_clip_list.clear();
209 assert(!clip_list.empty());
210 assert(!splice_ready); // This corner case should have been handled in splice_play().
212 pause_status = this->pause_status;
216 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
217 int64_t slept_pts = duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
219 if (video_stream != nullptr) {
220 // Add silence for the time we're waiting.
221 video_stream->schedule_silence(steady_clock::now(), pts, slept_pts, QueueSpotHolder());
227 if (video_stream != nullptr) {
228 ++metric_refresh_frame;
229 string subtitle = "Futatabi " NAGERU_VERSION ";PAUSED;0.000;" + pause_status;
230 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder(),
236 should_skip_to_next = false; // To make sure we don't have a lingering click from before play.
237 steady_clock::time_point origin = steady_clock::now(); // TODO: Add a 100 ms buffer for ramp-up?
238 TimelineTracker timeline(start_master_speed, pts);
239 timeline.new_clip(origin, &clip_list[0].clip, /*pts_offset=*/0);
240 for (size_t clip_idx = 0; clip_idx < clip_list.size(); ++clip_idx) {
241 const Clip *clip = &clip_list[clip_idx].clip;
242 const Clip *next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
244 double next_clip_fade_time = -1.0;
245 if (next_clip != nullptr) {
246 double duration_this_clip = double(clip->pts_out - timeline.get_in_pts_origin()) / TIMEBASE / clip->speed;
247 double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
248 next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
251 int stream_idx = clip->stream_idx;
253 // Start playing exactly at a frame.
254 // TODO: Snap secondary (fade-to) clips in the same fashion
255 // so that we don't get jank here).
257 lock_guard<mutex> lock(frame_mu);
259 // Find the first frame such that frame.pts <= in_pts.
260 auto it = find_last_frame_before(frames[stream_idx], timeline.get_in_pts_origin());
261 if (it != frames[stream_idx].end()) {
262 timeline.snap_by(it->pts - timeline.get_in_pts_origin());
266 steady_clock::time_point next_frame_start;
267 for (int64_t frameno = 0; !should_quit; ++frameno) { // Ends when the clip ends.
268 TimelineTracker::Instant instant = timeline.advance_to_frame(frameno);
269 int64_t in_pts = instant.in_pts;
270 pts = instant.out_pts;
271 next_frame_start = instant.wallclock_time;
273 float new_master_speed = change_master_speed.exchange(0.0f / 0.0f);
274 if (!std::isnan(new_master_speed)) {
275 timeline.change_master_speed(new_master_speed, instant);
278 if (should_skip_to_next.exchange(false)) { // Test and clear.
279 Clip *clip = &clip_list[clip_idx].clip; // Get a non-const pointer.
280 clip->pts_out = std::min<int64_t>(clip->pts_out, llrint(in_pts + clip->fade_time_seconds * clip->speed * TIMEBASE));
283 if (in_pts >= clip->pts_out) {
287 // Only play audio if we're within 0.1% of normal speed. We could do
288 // stretching or pitch shift later if it becomes needed.
289 const bool play_audio = timeline.playing_at_normal_speed();
292 lock_guard<mutex> lock(queue_state_mu);
294 if (next_clip == nullptr) {
295 do_splice(to_splice_clip_list, clip_idx, -1, &clip_list);
297 do_splice(to_splice_clip_list, clip_idx, clip_idx + 1, &clip_list);
299 to_splice_clip_list.clear();
300 splice_ready = false;
302 // Refresh the clip pointer, since the clip list may have been reallocated.
303 clip = &clip_list[clip_idx].clip;
305 // Recompute next_clip and any needed fade times, since the next clip may have changed
306 // (or we may have gone from no new clip to having one, or the other way).
307 next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1].clip : nullptr;
308 if (next_clip != nullptr) {
309 double duration_this_clip = double(clip->pts_out - timeline.get_in_pts_origin()) / TIMEBASE / clip->speed;
310 double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip->speed;
311 next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip->fade_time_seconds);
316 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
317 metric_player_ahead_seconds.count_event(-duration<double>(time_behind).count());
318 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
319 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
320 lrint(1e3 * duration<double>(time_behind).count()));
321 ++metric_dropped_unconditional_frame;
325 // pts not affected by the swapping below.
326 int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
328 int primary_stream_idx = stream_idx;
329 FrameOnDisk secondary_frame;
330 int secondary_stream_idx = -1;
331 float fade_alpha = 0.0f;
332 double time_left_this_clip = double(clip->pts_out - in_pts) / TIMEBASE / clip->speed;
333 if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
334 // We're in a fade to the next clip->
335 secondary_stream_idx = next_clip->stream_idx;
336 int64_t in_pts_secondary = lrint(next_clip->pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip->speed);
337 in_pts_secondary_for_progress = in_pts_secondary;
338 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
340 // If more than half-way through the fade, interpolate the next clip
341 // instead of the current one, since it's more visible.
342 if (fade_alpha >= 0.5f) {
343 swap(primary_stream_idx, secondary_stream_idx);
344 swap(in_pts, in_pts_secondary);
345 fade_alpha = 1.0f - fade_alpha;
348 FrameOnDisk frame_lower, frame_upper;
349 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
352 secondary_frame = frame_lower;
354 secondary_stream_idx = -1;
358 // NOTE: None of this will take into account any snapping done below.
359 double clip_progress = calc_progress(*clip, in_pts_for_progress);
360 map<uint64_t, double> progress{ { clip_list[clip_idx].id, clip_progress } };
361 TimeRemaining time_remaining;
362 if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
363 double next_clip_progress = calc_progress(*next_clip, in_pts_secondary_for_progress);
364 progress[clip_list[clip_idx + 1].id] = next_clip_progress;
365 time_remaining = compute_time_left(clip_list, clip_idx + 1, next_clip_progress);
367 time_remaining = compute_time_left(clip_list, clip_idx, clip_progress);
369 if (progress_callback != nullptr) {
370 progress_callback(progress, time_remaining);
373 FrameOnDisk frame_lower, frame_upper;
374 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
379 // Wait until we should, or (given buffering) can, output the frame.
381 unique_lock<mutex> lock(queue_state_mu);
382 if (video_stream == nullptr) {
383 // No queue, just wait until the right time and then show the frame.
384 new_clip_changed.wait_until(lock, next_frame_start, [this] {
385 return should_quit || new_clip_ready || override_stream_idx != -1;
391 // If the queue is full (which is really the state we'd like to be in),
392 // wait until there's room for one more frame (ie., one was output from
393 // VideoStream), or until or until there's a new clip we're supposed to play.
395 // In this case, we don't sleep until next_frame_start; the displaying is
396 // done by the queue.
397 new_clip_changed.wait(lock, [this] {
398 if (num_queued_frames < max_queued_frames) {
401 return should_quit || new_clip_ready || override_stream_idx != -1;
407 if (new_clip_ready) {
408 if (video_stream != nullptr) {
409 lock.unlock(); // Urg.
410 video_stream->clear_queue();
415 // Honor if we got an override request for the camera.
416 if (override_stream_idx != -1) {
417 stream_idx = override_stream_idx;
418 override_stream_idx = -1;
426 ss.imbue(locale("C"));
428 ss << "Futatabi " NAGERU_VERSION ";PLAYING;";
429 ss << fixed << (time_remaining.num_infinite * 86400.0 + time_remaining.t);
430 ss << ";" << format_duration(time_remaining) << " left";
434 // Snap to input frame: If we can do so with less than 1% jitter
435 // (ie., move less than 1% of an _output_ frame), do so.
436 // TODO: Snap secondary (fade-to) clips in the same fashion.
437 double pts_snap_tolerance = 0.01 * double(TIMEBASE) * clip->speed / global_flags.output_framerate;
438 bool snapped = false;
439 for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
440 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
441 display_single_frame(primary_stream_idx, snap_frame, secondary_stream_idx,
442 secondary_frame, fade_alpha, next_frame_start, /*snapped=*/true,
443 subtitle, play_audio);
444 timeline.snap_by(snap_frame.pts - in_pts);
453 // If there's nothing to interpolate between, or if interpolation is turned off,
454 // or we're a preview, then just display the frame.
455 if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0 || video_stream == nullptr) {
456 display_single_frame(primary_stream_idx, frame_lower, secondary_stream_idx,
457 secondary_frame, fade_alpha, next_frame_start, /*snapped=*/false,
458 subtitle, play_audio);
462 // The snapping above makes us lock to the input framerate, even in the presence
463 // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
464 // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
465 // get a snap very rarely (in the given case, once every 24 output frames), and by
466 // that time, we'd have drifted out. We could have solved this by changing the overall
467 // speed ever so slightly, but it requires that we know the actual frame rate (which
468 // is difficult in the presence of jitter and missed frames), or at least do some kind
469 // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
470 // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
471 // an original frame every other frame; we would also snap to exactly alpha=0.5 every
472 // in-between frame. Of course, we will still need to interpolate, but we get a lot
473 // closer when we actually get close to an original frame. In other words: Snap more
474 // often, but snap less each time. Unless the input and output frame rates are completely
475 // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
476 // really never see in practice).
477 for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
478 1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
479 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
480 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
481 timeline.snap_by(lrint(subsnap_pts) - in_pts);
482 in_pts = lrint(subsnap_pts);
487 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
488 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
489 lrint(1e3 * duration<double>(time_behind).count()));
490 ++metric_dropped_interpolated_frame;
494 double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
495 auto display_func = [this](shared_ptr<Frame> frame) {
496 if (destination != nullptr) {
497 destination->setFrame(frame);
500 if (secondary_stream_idx == -1) {
501 ++metric_interpolated_frame;
503 ++metric_interpolated_faded_frame;
505 video_stream->schedule_interpolated_frame(
506 next_frame_start, pts, display_func, QueueSpotHolder(this),
507 frame_lower, frame_upper, alpha,
508 secondary_frame, fade_alpha, subtitle, play_audio);
509 last_pts_played = in_pts; // Not really needed; only previews use last_pts_played.
517 // Start the next clip from the point where the fade went out.
518 if (next_clip != nullptr) {
519 timeline.new_clip(next_frame_start, next_clip, /*pts_start_offset=*/lrint(next_clip_fade_time * TIMEBASE * clip->speed));
523 if (done_callback != nullptr) {
528 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)
530 auto display_func = [this, primary_stream_idx, primary_frame, secondary_frame, fade_alpha] {
531 if (destination != nullptr) {
532 destination->setFrame(primary_stream_idx, primary_frame, secondary_frame, fade_alpha);
535 if (video_stream == nullptr) {
538 if (secondary_stream_idx == -1) {
539 // NOTE: We could be increasing unused metrics for previews, but that's harmless.
541 ++metric_original_snapped_frame;
543 ++metric_original_frame;
545 video_stream->schedule_original_frame(
546 frame_start, pts, display_func, QueueSpotHolder(this),
547 primary_frame, subtitle, play_audio);
549 assert(secondary_frame.pts != -1);
550 // NOTE: We could be increasing unused metrics for previews, but that's harmless.
552 ++metric_faded_snapped_frame;
554 ++metric_faded_frame;
556 video_stream->schedule_faded_frame(frame_start, pts, display_func,
557 QueueSpotHolder(this), primary_frame,
558 secondary_frame, fade_alpha, subtitle);
561 last_pts_played = primary_frame.pts;
564 // Find the frame immediately before and after this point.
565 // If we have an exact match, return it immediately.
566 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
568 lock_guard<mutex> lock(frame_mu);
570 // Find the first frame such that frame.pts >= pts.
571 auto it = find_last_frame_before(frames[stream_idx], pts);
572 if (it == frames[stream_idx].end()) {
577 // If we have an exact match, return it immediately.
578 if (frame_upper->pts == pts) {
583 // Find the last frame such that in_pts <= frame.pts (if any).
584 if (it == frames[stream_idx].begin()) {
587 *frame_lower = *(it - 1);
589 assert(pts >= frame_lower->pts);
590 assert(pts <= frame_upper->pts);
594 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
595 : destination(destination), stream_output(stream_output)
597 player_thread = thread(&Player::thread_func, this, file_avctx);
599 if (stream_output == HTTPD_STREAM_OUTPUT) {
600 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_original_frame);
601 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" } }, &metric_faded_frame);
602 global_metrics.add("http_output_frames", { { "type", "original" }, { "reason", "snapped" } }, &metric_original_snapped_frame);
603 global_metrics.add("http_output_frames", { { "type", "faded" }, { "reason", "snapped" } }, &metric_faded_snapped_frame);
604 global_metrics.add("http_output_frames", { { "type", "interpolated" } }, &metric_interpolated_frame);
605 global_metrics.add("http_output_frames", { { "type", "interpolated_faded" } }, &metric_interpolated_faded_frame);
606 global_metrics.add("http_output_frames", { { "type", "refresh" } }, &metric_refresh_frame);
607 global_metrics.add("http_dropped_frames", { { "type", "interpolated" } }, &metric_dropped_interpolated_frame);
608 global_metrics.add("http_dropped_frames", { { "type", "unconditional" } }, &metric_dropped_unconditional_frame);
610 vector<double> quantiles{ 0.01, 0.1, 0.25, 0.5, 0.75, 0.9, 0.99 };
611 metric_player_ahead_seconds.init(quantiles, 60.0);
612 global_metrics.add("player_ahead_seconds", &metric_player_ahead_seconds);
619 new_clip_changed.notify_all();
620 player_thread.join();
622 if (video_stream != nullptr) {
623 video_stream->stop();
627 void Player::play(const vector<ClipWithID> &clips)
629 lock_guard<mutex> lock(queue_state_mu);
630 new_clip_ready = true;
631 queued_clip_list = clips;
632 splice_ready = false;
633 override_stream_idx = -1;
634 new_clip_changed.notify_all();
637 void Player::splice_play(const vector<ClipWithID> &clips)
639 lock_guard<mutex> lock(queue_state_mu);
640 if (new_clip_ready) {
641 queued_clip_list = clips;
642 assert(!splice_ready);
647 to_splice_clip_list = clips; // Overwrite any queued but not executed splice.
650 void Player::override_angle(unsigned stream_idx)
654 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
656 lock_guard<mutex> lock(queue_state_mu);
657 if (new_clip_ready) {
658 assert(queued_clip_list.size() == 1);
659 queued_clip_list[0].clip.stream_idx = stream_idx;
663 // If we are playing a clip, set override_stream_idx, and the player thread will
664 // pick it up and change its internal index.
666 override_stream_idx = stream_idx;
667 new_clip_changed.notify_all();
671 // OK, so we're standing still, presumably at the end of a clip.
672 // Look at the last frame played (if it exists), and show the closest
674 if (last_pts_played < 0) {
677 last_pts = last_pts_played;
680 lock_guard<mutex> lock(frame_mu);
681 auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
682 if (it == frames[stream_idx].end()) {
685 destination->setFrame(stream_idx, *it);
688 void Player::take_queue_spot()
690 lock_guard<mutex> lock(queue_state_mu);
694 void Player::release_queue_spot()
696 lock_guard<mutex> lock(queue_state_mu);
697 assert(num_queued_frames > 0);
699 new_clip_changed.notify_all();
702 TimeRemaining compute_time_left(const vector<ClipWithID> &clips, size_t currently_playing_idx, double progress_currently_playing)
704 // Look at the last clip and then start counting from there.
705 TimeRemaining remaining { 0, 0.0 };
706 double last_fade_time_seconds = 0.0;
707 for (size_t row = currently_playing_idx; row < clips.size(); ++row) {
708 const Clip &clip = clips[row].clip;
709 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
710 if (clip_length >= 86400.0 || clip.pts_out == -1) { // More than one day.
711 ++remaining.num_infinite;
713 if (row == currently_playing_idx) {
714 // A clip we're playing: Subtract the part we've already played.
715 remaining.t = clip_length * (1.0 - progress_currently_playing);
717 // A clip we haven't played yet: Subtract the part that's overlapping
718 // with a previous clip (due to fade).
719 remaining.t += max(clip_length - last_fade_time_seconds, 0.0);
722 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
727 string format_duration(TimeRemaining t)
729 int t_ms = lrint(t.t * 1e3);
731 int ms = t_ms % 1000;
738 if (t.num_infinite > 1 && t.t > 0.0) {
739 snprintf(buf, sizeof(buf), "%zu clips + %d:%02d.%03d", t.num_infinite, m, s, ms);
740 } else if (t.num_infinite > 1) {
741 snprintf(buf, sizeof(buf), "%zu clips", t.num_infinite);
742 } else if (t.num_infinite == 1 && t.t > 0.0) {
743 snprintf(buf, sizeof(buf), "%zu clip + %d:%02d.%03d", t.num_infinite, m, s, ms);
744 } else if (t.num_infinite == 1) {
745 snprintf(buf, sizeof(buf), "%zu clip", t.num_infinite);
747 snprintf(buf, sizeof(buf), "%d:%02d.%03d", m, s, ms);