4 #include "shared/context.h"
6 #include "shared/ffmpeg_raii.h"
8 #include "frame_on_disk.h"
9 #include "shared/httpd.h"
10 #include "jpeg_frame_view.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) {
56 void Player::play_playlist_once()
58 vector<Clip> clip_list;
60 steady_clock::time_point before_sleep = steady_clock::now();
62 // Wait until we're supposed to play something.
64 unique_lock<mutex> lock(queue_state_mu);
66 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
67 return should_quit || new_clip_ready;
73 new_clip_ready = false;
75 clip_list = move(queued_clip_list);
76 queued_clip_list.clear();
77 assert(!clip_list.empty());
81 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
82 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
85 if (video_stream != nullptr) {
86 ++metric_refresh_frame;
87 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
92 steady_clock::time_point origin = steady_clock::now(); // TODO: Add a 100 ms buffer for ramp-up?
93 int64_t in_pts_origin = clip_list[0].pts_in;
94 for (size_t clip_idx = 0; clip_idx < clip_list.size(); ++clip_idx) {
95 const Clip &clip = clip_list[clip_idx];
96 const Clip *next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1] : nullptr;
97 int64_t out_pts_origin = pts;
99 double next_clip_fade_time = -1.0;
100 if (next_clip != nullptr) {
101 double duration_this_clip = double(clip.pts_out - in_pts_origin) / TIMEBASE / clip.speed;
102 double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip.speed;
103 next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip.fade_time_seconds);
106 int stream_idx = clip.stream_idx;
108 // Start playing exactly at a frame.
109 // TODO: Snap secondary (fade-to) clips in the same fashion
110 // so that we don't get jank here).
112 lock_guard<mutex> lock(frame_mu);
114 // Find the first frame such that frame.pts <= in_pts.
115 auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
116 if (it != frames[stream_idx].end()) {
117 in_pts_origin = it->pts;
121 steady_clock::time_point next_frame_start;
122 for (int frameno = 0; !should_quit; ++frameno) { // Ends when the clip ends.
123 double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
125 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
126 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
127 pts = lrint(out_pts);
129 if (in_pts >= clip.pts_out) {
133 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
134 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
135 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
136 lrint(1e3 * duration<double>(time_behind).count()));
137 ++metric_dropped_unconditional_frame;
142 // pts not affected by the swapping below.
143 int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
145 int primary_stream_idx = stream_idx;
146 FrameOnDisk secondary_frame;
147 int secondary_stream_idx = -1;
148 float fade_alpha = 0.0f;
149 double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
150 if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
151 // We're in a fade to the next clip.
152 secondary_stream_idx = next_clip->stream_idx;
153 int64_t in_pts_secondary = lrint(next_clip->pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
154 in_pts_secondary_for_progress = in_pts_secondary;
155 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
157 // If more than half-way through the fade, interpolate the next clip
158 // instead of the current one, since it's more visible.
159 if (fade_alpha >= 0.5f) {
160 swap(primary_stream_idx, secondary_stream_idx);
161 swap(in_pts, in_pts_secondary);
162 fade_alpha = 1.0f - fade_alpha;
165 FrameOnDisk frame_lower, frame_upper;
166 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
168 secondary_frame = frame_lower;
172 if (progress_callback != nullptr) {
173 // NOTE: None of this will take into account any snapping done below.
174 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
175 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
176 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
178 if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
179 double played_next_clip = double(in_pts_secondary_for_progress - next_clip->pts_in) / TIMEBASE / next_clip->speed;
180 double total_next_length = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / next_clip->speed;
181 progress[clip_idx + 1] = played_next_clip / total_next_length;
183 progress_callback(progress);
186 FrameOnDisk frame_lower, frame_upper;
187 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
192 // Wait until we should, or (given buffering) can, output the frame.
194 unique_lock<mutex> lock(queue_state_mu);
195 if (video_stream == nullptr) {
196 // No queue, just wait until the right time and then show the frame.
197 new_clip_changed.wait_until(lock, next_frame_start, [this]{
198 return should_quit || new_clip_ready || override_stream_idx != -1;
204 // If the queue is full (which is really the state we'd like to be in),
205 // wait until there's room for one more frame (ie., one was output from
206 // VideoStream), or until or until there's a new clip we're supposed to play.
208 // In this case, we don't sleep until next_frame_start; the displaying is
209 // done by the queue.
210 new_clip_changed.wait(lock, [this]{
211 if (num_queued_frames < max_queued_frames) {
214 return should_quit || new_clip_ready || override_stream_idx != -1;
220 if (new_clip_ready) {
221 if (video_stream != nullptr) {
222 lock.unlock(); // Urg.
223 video_stream->clear_queue();
228 // Honor if we got an override request for the camera.
229 if (override_stream_idx != -1) {
230 stream_idx = override_stream_idx;
231 override_stream_idx = -1;
236 if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
237 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
238 if (destination != nullptr) {
239 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
242 if (video_stream == nullptr) {
245 if (secondary_stream_idx == -1) {
246 ++metric_original_frame;
247 video_stream->schedule_original_frame(
248 next_frame_start, pts, display_func, QueueSpotHolder(this),
251 assert(secondary_frame.pts != -1);
252 ++metric_faded_frame;
253 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
254 QueueSpotHolder(this), frame_lower,
255 secondary_frame, fade_alpha);
258 last_pts_played = frame_lower.pts;
262 // Snap to input frame: If we can do so with less than 1% jitter
263 // (ie., move less than 1% of an _output_ frame), do so.
264 // TODO: Snap secondary (fade-to) clips in the same fashion.
265 double pts_snap_tolerance = 0.01 * double(TIMEBASE) / global_flags.output_framerate;
266 bool snapped = false;
267 for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
268 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
269 auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
270 if (destination != nullptr) {
271 destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
274 if (video_stream == nullptr) {
277 if (secondary_stream_idx == -1) {
278 ++metric_original_snapped_frame;
279 video_stream->schedule_original_frame(
280 next_frame_start, pts, display_func,
281 QueueSpotHolder(this), snap_frame);
283 assert(secondary_frame.pts != -1);
284 ++metric_faded_snapped_frame;
285 video_stream->schedule_faded_frame(
286 next_frame_start, pts, display_func, QueueSpotHolder(this),
287 snap_frame, secondary_frame, fade_alpha);
290 in_pts_origin += snap_frame.pts - in_pts;
292 last_pts_played = snap_frame.pts;
300 // The snapping above makes us lock to the input framerate, even in the presence
301 // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
302 // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
303 // get a snap very rarely (in the given case, once every 24 output frames), and by
304 // that time, we'd have drifted out. We could have solved this by changing the overall
305 // speed ever so slightly, but it requires that we know the actual frame rate (which
306 // is difficult in the presence of jitter and missed frames), or at least do some kind
307 // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
308 // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
309 // an original frame every other frame; we would also snap to exactly alpha=0.5 every
310 // in-between frame. Of course, we will still need to interpolate, but we get a lot
311 // closer when we actually get close to an original frame. In other words: Snap more
312 // often, but snap less each time. Unless the input and output frame rates are completely
313 // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
314 // really never see in practice).
315 for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
316 1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
317 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
318 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
319 in_pts_origin += lrint(subsnap_pts) - in_pts;
320 in_pts = lrint(subsnap_pts);
325 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
326 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
327 lrint(1e3 * duration<double>(time_behind).count()));
328 ++metric_dropped_interpolated_frame;
332 double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
334 if (video_stream == nullptr) {
335 // Previews don't do any interpolation.
336 assert(secondary_stream_idx == -1);
337 if (destination != nullptr) {
338 destination->setFrame(primary_stream_idx, frame_lower);
340 last_pts_played = frame_lower.pts;
342 auto display_func = [this](shared_ptr<Frame> frame) {
343 if (destination != nullptr) {
344 destination->setFrame(frame);
347 if (secondary_stream_idx == -1) {
348 ++metric_interpolated_frame;
350 ++metric_interpolated_faded_frame;
352 video_stream->schedule_interpolated_frame(
353 next_frame_start, pts, display_func, QueueSpotHolder(this),
354 frame_lower, frame_upper, alpha,
355 secondary_frame, fade_alpha);
356 last_pts_played = in_pts; // Not really needed; only previews use last_pts_played.
364 if (done_callback != nullptr) {
368 // Start the next clip from the point where the fade went out.
369 if (next_clip != nullptr) {
370 origin = next_frame_start;
371 in_pts_origin = next_clip->pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
375 if (done_callback != nullptr) {
380 // Find the frame immediately before and after this point.
381 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
383 lock_guard<mutex> lock(frame_mu);
385 // Find the first frame such that frame.pts >= pts.
386 auto it = find_last_frame_before(frames[stream_idx], pts);
387 if (it == frames[stream_idx].end()) {
392 // Find the last frame such that in_pts <= frame.pts (if any).
393 if (it == frames[stream_idx].begin()) {
396 *frame_lower = *(it - 1);
398 assert(pts >= frame_lower->pts);
399 assert(pts <= frame_upper->pts);
403 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
404 : destination(destination), stream_output(stream_output)
406 player_thread = thread(&Player::thread_func, this, file_avctx);
408 if (stream_output == HTTPD_STREAM_OUTPUT) {
409 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_original_frame);
410 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_faded_frame);
411 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "snapped" }}, &metric_original_snapped_frame);
412 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "snapped" }}, &metric_faded_snapped_frame);
413 global_metrics.add("http_output_frames", {{ "type", "interpolated" }}, &metric_interpolated_frame);
414 global_metrics.add("http_output_frames", {{ "type", "interpolated_faded" }}, &metric_interpolated_faded_frame);
415 global_metrics.add("http_output_frames", {{ "type", "refresh" }}, &metric_refresh_frame);
416 global_metrics.add("http_dropped_frames", {{ "type", "interpolated" }}, &metric_dropped_interpolated_frame);
417 global_metrics.add("http_dropped_frames", {{ "type", "unconditional" }}, &metric_dropped_unconditional_frame);
424 if (video_stream != nullptr) {
425 video_stream->stop();
427 new_clip_changed.notify_all();
428 player_thread.join();
431 void Player::play(const vector<Clip> &clips)
433 lock_guard<mutex> lock(queue_state_mu);
434 new_clip_ready = true;
435 queued_clip_list = clips;
436 override_stream_idx = -1;
437 new_clip_changed.notify_all();
440 void Player::override_angle(unsigned stream_idx)
444 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
446 lock_guard<mutex> lock(queue_state_mu);
447 if (new_clip_ready) {
448 assert(queued_clip_list.size() == 1);
449 queued_clip_list[0].stream_idx = stream_idx;
453 // If we are playing a clip, set override_stream_idx, and the player thread will
454 // pick it up and change its internal index.
456 override_stream_idx = stream_idx;
457 new_clip_changed.notify_all();
461 // OK, so we're standing still, presumably at the end of a clip.
462 // Look at the last frame played (if it exists), and show the closest
464 if (last_pts_played < 0) {
467 last_pts = last_pts_played;
470 lock_guard<mutex> lock(frame_mu);
471 auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
472 if (it == frames[stream_idx].end()) {
475 destination->setFrame(stream_idx, *it);
478 void Player::take_queue_spot()
480 lock_guard<mutex> lock(queue_state_mu);
484 void Player::release_queue_spot()
486 lock_guard<mutex> lock(queue_state_mu);
487 assert(num_queued_frames > 0);
489 new_clip_changed.notify_all();
492 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
494 // Look at the last clip and then start counting from there.
495 assert(!progress.empty());
496 auto last_it = progress.end();
498 double remaining = 0.0;
499 double last_fade_time_seconds = 0.0;
500 for (size_t row = last_it->first; row < clips.size(); ++row) {
501 const Clip &clip = clips[row];
502 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
503 if (row == last_it->first) {
504 // A clip we're playing: Subtract the part we've already played.
505 remaining = clip_length * (1.0 - last_it->second);
507 // A clip we haven't played yet: Subtract the part that's overlapping
508 // with a previous clip (due to fade).
509 remaining += max(clip_length - last_fade_time_seconds, 0.0);
511 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);