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/mux.h"
12 #include "shared/timebase.h"
13 #include "video_stream.h"
17 #include <condition_variable>
18 #include <movit/util.h>
25 using namespace std::chrono;
27 extern HTTPD *global_httpd;
29 void Player::thread_func(bool also_output_to_stream)
31 pthread_setname_np(pthread_self(), "Player");
33 QSurface *surface = create_surface();
34 QOpenGLContext *context = create_context(surface);
35 if (!make_current(context, surface)) {
42 // Create the VideoStream object, now that we have an OpenGL context.
43 if (also_output_to_stream) {
44 video_stream.reset(new VideoStream);
45 video_stream->start();
50 constexpr double output_framerate = 60000.0 / 1001.0; // FIXME: make configurable
53 size_t next_clip_idx = size_t(-1);
54 bool got_next_clip = false;
55 double next_clip_fade_time = -1.0;
57 while (!should_quit) {
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);
65 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
66 return should_quit || (new_clip_ready && current_clip.pts_in != -1);
71 new_clip_ready = false;
75 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
76 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
79 if (video_stream != nullptr) {
80 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
89 lock_guard<mutex> lock(mu);
91 clip_idx = current_clip_idx;
92 stream_idx = current_stream_idx;
94 steady_clock::time_point origin = steady_clock::now(); // TODO: Add a 100 ms buffer for ramp-up?
95 int64_t in_pts_origin = clip.pts_in;
97 int64_t out_pts_origin = pts;
99 // Start playing exactly at a frame.
100 // TODO: Snap secondary (fade-to) clips in the same fashion
101 // so that we don't get jank here).
103 lock_guard<mutex> lock(frame_mu);
105 // Find the first frame such that frame.pts <= in_pts.
106 auto it = lower_bound(frames[stream_idx].begin(),
107 frames[stream_idx].end(),
109 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
110 if (it != frames[stream_idx].end()) {
111 in_pts_origin = it->pts;
115 // TODO: Lock to a rational multiple of the frame rate if possible.
118 int64_t in_pts_start_next_clip = -1;
119 steady_clock::time_point next_frame_start;
120 for (int frameno = 0; !should_quit; ++frameno) { // Ends when the clip ends.
121 double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
123 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
124 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
125 pts = lrint(out_pts);
127 if (in_pts >= clip.pts_out) {
131 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
132 if (time_behind >= milliseconds(200)) {
133 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
134 lrint(1e3 * duration<double>(time_behind).count()));
138 double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
139 if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
140 // Find the next clip so that we can begin a fade.
141 tie(next_clip, next_clip_idx) = next_clip_callback();
142 if (next_clip.pts_in != -1) {
143 got_next_clip = true;
145 double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
146 next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
147 in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
151 // pts not affected by the swapping below.
152 int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
154 int primary_stream_idx = stream_idx;
155 FrameOnDisk secondary_frame;
156 int secondary_stream_idx = -1;
157 float fade_alpha = 0.0f;
158 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
159 secondary_stream_idx = next_clip.stream_idx;
160 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
161 in_pts_secondary_for_progress = in_pts_secondary;
162 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
164 // If more than half-way through the fade, interpolate the next clip
165 // instead of the current one, since it's more visible.
166 if (fade_alpha >= 0.5f) {
167 swap(primary_stream_idx, secondary_stream_idx);
168 swap(in_pts, in_pts_secondary);
169 fade_alpha = 1.0f - fade_alpha;
172 FrameOnDisk frame_lower, frame_upper;
173 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
175 secondary_frame = frame_lower;
179 if (progress_callback != nullptr) {
180 // NOTE: None of this will take into account any snapping done below.
181 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / speed;
182 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
183 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
185 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
186 double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / speed;
187 double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
188 progress[next_clip_idx] = played_next_clip / total_next_length;
190 progress_callback(progress);
193 FrameOnDisk frame_lower, frame_upper;
194 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
200 unique_lock<mutex> lock(queue_state_mu);
201 if (video_stream == nullptr) {
202 // No queue, just wait until the right time and then show the frame.
203 new_clip_changed.wait_until(lock, next_frame_start, [this]{
204 return should_quit || new_clip_ready || override_stream_idx != -1;
210 // If the queue is full (which is really the state we'd like to be in),
211 // wait until there's room for one more frame (ie., one was output from
212 // VideoStream), or until or until there's a new clip we're supposed to play.
214 // In this case, we don't sleep until next_frame_start; the displaying is
215 // done by the queue.
216 new_clip_changed.wait(lock, [this]{
217 if (num_queued_frames < max_queued_frames) {
220 return should_quit || new_clip_ready || override_stream_idx != -1;
226 if (new_clip_ready) {
227 if (video_stream != nullptr) {
228 lock.unlock(); // Urg.
229 video_stream->clear_queue();
232 got_next_clip = false;
235 if (override_stream_idx != -1) {
236 stream_idx = override_stream_idx;
237 override_stream_idx = -1;
242 if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
243 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
244 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
246 if (video_stream == nullptr) {
249 if (secondary_stream_idx == -1) {
250 video_stream->schedule_original_frame(
251 next_frame_start, pts, display_func, QueueSpotHolder(this),
254 assert(secondary_frame.pts != -1);
255 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
256 QueueSpotHolder(this), frame_lower,
257 secondary_frame, fade_alpha);
263 // Snap to input frame: If we can do so with less than 1% jitter
264 // (ie., move less than 1% of an _output_ frame), do so.
265 // TODO: Snap secondary (fade-to) clips in the same fashion.
266 bool snapped = false;
267 for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
268 double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
269 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
270 auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
271 destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
273 if (video_stream == nullptr) {
276 if (secondary_stream_idx == -1) {
277 video_stream->schedule_original_frame(
278 next_frame_start, pts, display_func,
279 QueueSpotHolder(this), snap_frame);
281 assert(secondary_frame.pts != -1);
282 video_stream->schedule_faded_frame(
283 next_frame_start, pts, display_func, QueueSpotHolder(this),
284 snap_frame, secondary_frame, fade_alpha);
287 in_pts_origin += snap_frame.pts - in_pts;
296 if (time_behind >= milliseconds(100)) {
297 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
298 lrint(1e3 * duration<double>(time_behind).count()));
302 double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
304 if (video_stream == nullptr) {
305 // Previews don't do any interpolation.
306 assert(secondary_stream_idx == -1);
307 destination->setFrame(primary_stream_idx, frame_lower);
309 auto display_func = [this](shared_ptr<Frame> frame) {
310 destination->setFrame(frame);
312 video_stream->schedule_interpolated_frame(
313 next_frame_start, pts, display_func, QueueSpotHolder(this),
314 frame_lower, frame_upper, alpha,
315 secondary_frame, fade_alpha);
325 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
326 if (!got_next_clip && next_clip_callback != nullptr) {
327 tie(next_clip, next_clip_idx) = next_clip_callback();
328 if (next_clip.pts_in != -1) {
329 got_next_clip = true;
330 in_pts_start_next_clip = next_clip.pts_in;
334 // Switch to next clip if we got it.
337 clip_idx = next_clip_idx;
338 stream_idx = next_clip.stream_idx; // Override is used for previews only, and next_clip is used for live ony.
339 if (done_callback != nullptr) {
342 got_next_clip = false;
344 // Start the next clip from the point where the fade went out.
345 origin = next_frame_start;
346 in_pts_origin = in_pts_start_next_clip;
351 unique_lock<mutex> lock(queue_state_mu);
354 if (done_callback != nullptr) {
360 // Find the frame immediately before and after this point.
361 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
363 lock_guard<mutex> lock(frame_mu);
365 // Find the first frame such that frame.pts >= pts.
366 auto it = lower_bound(frames[stream_idx].begin(),
367 frames[stream_idx].end(),
369 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
370 if (it == frames[stream_idx].end()) {
375 // Find the last frame such that in_pts <= frame.pts (if any).
376 if (it == frames[stream_idx].begin()) {
379 *frame_lower = *(it - 1);
381 assert(pts >= frame_lower->pts);
382 assert(pts <= frame_upper->pts);
386 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
387 : destination(destination)
389 player_thread = thread(&Player::thread_func, this, also_output_to_stream);
395 if (video_stream != nullptr) {
396 video_stream->stop();
398 new_clip_changed.notify_all();
399 player_thread.join();
402 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
405 lock_guard<mutex> lock(mu);
407 current_stream_idx = stream_idx;
408 current_clip_idx = clip_idx;
412 lock_guard<mutex> lock(queue_state_mu);
413 new_clip_ready = true;
414 override_stream_idx = -1;
415 new_clip_changed.notify_all();
419 void Player::override_angle(unsigned stream_idx)
421 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
423 unique_lock<mutex> lock(queue_state_mu);
424 if (new_clip_ready) {
425 lock_guard<mutex> lock2(mu);
426 current_stream_idx = stream_idx;
431 // If we are playing a clip, set override_stream_idx, and the player thread will
432 // pick it up and change its internal index.
434 unique_lock<mutex> lock(queue_state_mu);
436 override_stream_idx = stream_idx;
437 new_clip_changed.notify_all();
441 // OK, so we're standing still, presumably at the end of a clip.
442 // Look at the current pts_out (if it exists), and show the closest
446 lock_guard<mutex> lock(mu);
447 if (current_clip.pts_out < 0) {
450 pts_out = current_clip.pts_out;
453 lock_guard<mutex> lock(frame_mu);
454 auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out,
455 [](int64_t pts, const FrameOnDisk &frame) { return pts < frame.pts; });
456 if (it == frames[stream_idx].end()) {
459 destination->setFrame(stream_idx, *it);
462 void Player::take_queue_spot()
464 unique_lock<mutex> lock(queue_state_mu);
468 void Player::release_queue_spot()
470 unique_lock<mutex> lock(queue_state_mu);
471 assert(num_queued_frames > 0);
473 new_clip_changed.notify_all();