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(Player::StreamOutput stream_output, AVFormatContext *file_avctx)
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 (stream_output != NO_STREAM_OUTPUT) {
44 video_stream.reset(new VideoStream(file_avctx));
45 video_stream->start();
52 size_t next_clip_idx = size_t(-1);
53 bool got_next_clip = false;
54 double next_clip_fade_time = -1.0;
56 while (!should_quit) {
59 steady_clock::time_point before_sleep = steady_clock::now();
61 // Wait until we're supposed to play something.
63 unique_lock<mutex> lock(queue_state_mu);
64 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
65 return should_quit || (new_clip_ready && current_clip.pts_in != -1);
70 new_clip_ready = false;
74 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
75 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
78 if (video_stream != nullptr) {
79 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
88 lock_guard<mutex> lock(mu);
90 clip_idx = current_clip_idx;
91 stream_idx = current_stream_idx;
93 steady_clock::time_point origin = steady_clock::now(); // TODO: Add a 100 ms buffer for ramp-up?
94 int64_t in_pts_origin = clip.pts_in;
96 int64_t out_pts_origin = pts;
98 // Start playing exactly at a frame.
99 // TODO: Snap secondary (fade-to) clips in the same fashion
100 // so that we don't get jank here).
102 lock_guard<mutex> lock(frame_mu);
104 // Find the first frame such that frame.pts <= in_pts.
105 auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
106 if (it != frames[stream_idx].end()) {
107 in_pts_origin = it->pts;
111 // TODO: Lock the speed to a rational multiple of the frame rate if possible.
113 int64_t in_pts_start_next_clip = -1;
114 steady_clock::time_point next_frame_start;
115 for (int frameno = 0; !should_quit; ++frameno) { // Ends when the clip ends.
116 double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
118 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
119 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
120 pts = lrint(out_pts);
122 if (in_pts >= clip.pts_out) {
126 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
127 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
128 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
129 lrint(1e3 * duration<double>(time_behind).count()));
133 double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
134 if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
135 // Find the next clip so that we can begin a fade.
136 tie(next_clip, next_clip_idx) = next_clip_callback();
137 if (next_clip.pts_in != -1) {
138 got_next_clip = true;
140 double duration_next_clip = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / clip.speed;
141 next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
142 in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
146 // pts not affected by the swapping below.
147 int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
149 int primary_stream_idx = stream_idx;
150 FrameOnDisk secondary_frame;
151 int secondary_stream_idx = -1;
152 float fade_alpha = 0.0f;
153 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
154 secondary_stream_idx = next_clip.stream_idx;
155 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
156 in_pts_secondary_for_progress = in_pts_secondary;
157 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
159 // If more than half-way through the fade, interpolate the next clip
160 // instead of the current one, since it's more visible.
161 if (fade_alpha >= 0.5f) {
162 swap(primary_stream_idx, secondary_stream_idx);
163 swap(in_pts, in_pts_secondary);
164 fade_alpha = 1.0f - fade_alpha;
167 FrameOnDisk frame_lower, frame_upper;
168 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
170 secondary_frame = frame_lower;
174 if (progress_callback != nullptr) {
175 // NOTE: None of this will take into account any snapping done below.
176 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
177 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
178 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
180 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
181 double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / next_clip.speed;
182 double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / next_clip.speed;
183 progress[next_clip_idx] = played_next_clip / total_next_length;
185 progress_callback(progress);
188 FrameOnDisk frame_lower, frame_upper;
189 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
195 unique_lock<mutex> lock(queue_state_mu);
196 if (video_stream == nullptr) {
197 // No queue, just wait until the right time and then show the frame.
198 new_clip_changed.wait_until(lock, next_frame_start, [this]{
199 return should_quit || new_clip_ready || override_stream_idx != -1;
205 // If the queue is full (which is really the state we'd like to be in),
206 // wait until there's room for one more frame (ie., one was output from
207 // VideoStream), or until or until there's a new clip we're supposed to play.
209 // In this case, we don't sleep until next_frame_start; the displaying is
210 // done by the queue.
211 new_clip_changed.wait(lock, [this]{
212 if (num_queued_frames < max_queued_frames) {
215 return should_quit || new_clip_ready || override_stream_idx != -1;
221 if (new_clip_ready) {
222 if (video_stream != nullptr) {
223 lock.unlock(); // Urg.
224 video_stream->clear_queue();
227 got_next_clip = false;
230 if (override_stream_idx != -1) {
231 stream_idx = override_stream_idx;
232 override_stream_idx = -1;
237 if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
238 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
239 if (destination != nullptr) {
240 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
243 if (video_stream == nullptr) {
246 if (secondary_stream_idx == -1) {
247 video_stream->schedule_original_frame(
248 next_frame_start, pts, display_func, QueueSpotHolder(this),
251 assert(secondary_frame.pts != -1);
252 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
253 QueueSpotHolder(this), frame_lower,
254 secondary_frame, fade_alpha);
260 // Snap to input frame: If we can do so with less than 1% jitter
261 // (ie., move less than 1% of an _output_ frame), do so.
262 // TODO: Snap secondary (fade-to) clips in the same fashion.
263 bool snapped = false;
264 for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
265 double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * global_flags.output_framerate / TIMEBASE / clip.speed;
266 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
267 auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
268 if (destination != nullptr) {
269 destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
272 if (video_stream == nullptr) {
275 if (secondary_stream_idx == -1) {
276 video_stream->schedule_original_frame(
277 next_frame_start, pts, display_func,
278 QueueSpotHolder(this), snap_frame);
280 assert(secondary_frame.pts != -1);
281 video_stream->schedule_faded_frame(
282 next_frame_start, pts, display_func, QueueSpotHolder(this),
283 snap_frame, secondary_frame, fade_alpha);
286 in_pts_origin += snap_frame.pts - in_pts;
295 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
296 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
297 lrint(1e3 * duration<double>(time_behind).count()));
301 double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
303 if (video_stream == nullptr) {
304 // Previews don't do any interpolation.
305 assert(secondary_stream_idx == -1);
306 if (destination != nullptr) {
307 destination->setFrame(primary_stream_idx, frame_lower);
310 auto display_func = [this](shared_ptr<Frame> frame) {
311 if (destination != nullptr) {
312 destination->setFrame(frame);
315 video_stream->schedule_interpolated_frame(
316 next_frame_start, pts, display_func, QueueSpotHolder(this),
317 frame_lower, frame_upper, alpha,
318 secondary_frame, fade_alpha);
328 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
329 if (!got_next_clip && next_clip_callback != nullptr) {
330 tie(next_clip, next_clip_idx) = next_clip_callback();
331 if (next_clip.pts_in != -1) {
332 got_next_clip = true;
333 in_pts_start_next_clip = next_clip.pts_in;
337 // Switch to next clip if we got it.
340 clip_idx = next_clip_idx;
341 stream_idx = next_clip.stream_idx; // Override is used for previews only, and next_clip is used for live ony.
342 if (done_callback != nullptr) {
345 got_next_clip = false;
347 // Start the next clip from the point where the fade went out.
348 origin = next_frame_start;
349 in_pts_origin = in_pts_start_next_clip;
354 unique_lock<mutex> lock(queue_state_mu);
357 if (done_callback != nullptr) {
363 // Find the frame immediately before and after this point.
364 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
366 lock_guard<mutex> lock(frame_mu);
368 // Find the first frame such that frame.pts >= pts.
369 auto it = find_last_frame_before(frames[stream_idx], 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, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
387 : destination(destination)
389 player_thread = thread(&Player::thread_func, this, stream_output, file_avctx);
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 = find_first_frame_at_or_after(frames[stream_idx], pts_out);
455 if (it == frames[stream_idx].end()) {
458 destination->setFrame(stream_idx, *it);
461 void Player::take_queue_spot()
463 unique_lock<mutex> lock(queue_state_mu);
467 void Player::release_queue_spot()
469 unique_lock<mutex> lock(queue_state_mu);
470 assert(num_queued_frames > 0);
472 new_clip_changed.notify_all();
475 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
477 // Look at the last clip and then start counting from there.
478 assert(!progress.empty());
479 auto last_it = progress.end();
481 double remaining = 0.0;
482 double last_fade_time_seconds = 0.0;
483 for (size_t row = last_it->first; row < clips.size(); ++row) {
484 const Clip &clip = clips[row];
485 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
486 if (row == last_it->first) {
487 // A clip we're playing: Subtract the part we've already played.
488 remaining = clip_length * (1.0 - last_it->second);
490 // A clip we haven't played yet: Subtract the part that's overlapping
491 // with a previous clip (due to fade).
492 remaining += max(clip_length - last_fade_time_seconds, 0.0);
494 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);