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 to a rational multiple of the frame rate if possible.
114 int64_t in_pts_start_next_clip = -1;
115 steady_clock::time_point next_frame_start;
116 for (int frameno = 0; !should_quit; ++frameno) { // Ends when the clip ends.
117 double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
119 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
120 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / global_flags.output_framerate);
121 pts = lrint(out_pts);
123 if (in_pts >= clip.pts_out) {
127 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
128 if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
129 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
130 lrint(1e3 * duration<double>(time_behind).count()));
134 double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
135 if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
136 // Find the next clip so that we can begin a fade.
137 tie(next_clip, next_clip_idx) = next_clip_callback();
138 if (next_clip.pts_in != -1) {
139 got_next_clip = true;
141 double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
142 next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
143 in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
147 // pts not affected by the swapping below.
148 int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
150 int primary_stream_idx = stream_idx;
151 FrameOnDisk secondary_frame;
152 int secondary_stream_idx = -1;
153 float fade_alpha = 0.0f;
154 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
155 secondary_stream_idx = next_clip.stream_idx;
156 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
157 in_pts_secondary_for_progress = in_pts_secondary;
158 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
160 // If more than half-way through the fade, interpolate the next clip
161 // instead of the current one, since it's more visible.
162 if (fade_alpha >= 0.5f) {
163 swap(primary_stream_idx, secondary_stream_idx);
164 swap(in_pts, in_pts_secondary);
165 fade_alpha = 1.0f - fade_alpha;
168 FrameOnDisk frame_lower, frame_upper;
169 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
171 secondary_frame = frame_lower;
175 if (progress_callback != nullptr) {
176 // NOTE: None of this will take into account any snapping done below.
177 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / speed;
178 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
179 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
181 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
182 double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / speed;
183 double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
184 progress[next_clip_idx] = played_next_clip / total_next_length;
186 progress_callback(progress);
189 FrameOnDisk frame_lower, frame_upper;
190 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
196 unique_lock<mutex> lock(queue_state_mu);
197 if (video_stream == nullptr) {
198 // No queue, just wait until the right time and then show the frame.
199 new_clip_changed.wait_until(lock, next_frame_start, [this]{
200 return should_quit || new_clip_ready || override_stream_idx != -1;
206 // If the queue is full (which is really the state we'd like to be in),
207 // wait until there's room for one more frame (ie., one was output from
208 // VideoStream), or until or until there's a new clip we're supposed to play.
210 // In this case, we don't sleep until next_frame_start; the displaying is
211 // done by the queue.
212 new_clip_changed.wait(lock, [this]{
213 if (num_queued_frames < max_queued_frames) {
216 return should_quit || new_clip_ready || override_stream_idx != -1;
222 if (new_clip_ready) {
223 if (video_stream != nullptr) {
224 lock.unlock(); // Urg.
225 video_stream->clear_queue();
228 got_next_clip = false;
231 if (override_stream_idx != -1) {
232 stream_idx = override_stream_idx;
233 override_stream_idx = -1;
238 if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
239 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
240 if (destination != nullptr) {
241 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
244 if (video_stream == nullptr) {
247 if (secondary_stream_idx == -1) {
248 video_stream->schedule_original_frame(
249 next_frame_start, pts, display_func, QueueSpotHolder(this),
252 assert(secondary_frame.pts != -1);
253 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
254 QueueSpotHolder(this), frame_lower,
255 secondary_frame, fade_alpha);
261 // Snap to input frame: If we can do so with less than 1% jitter
262 // (ie., move less than 1% of an _output_ frame), do so.
263 // TODO: Snap secondary (fade-to) clips in the same fashion.
264 bool snapped = false;
265 for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
266 double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * global_flags.output_framerate / TIMEBASE / speed;
267 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
268 auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
269 if (destination != nullptr) {
270 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 (stream_output != FILE_STREAM_OUTPUT && 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 if (destination != nullptr) {
308 destination->setFrame(primary_stream_idx, frame_lower);
311 auto display_func = [this](shared_ptr<Frame> frame) {
312 if (destination != nullptr) {
313 destination->setFrame(frame);
316 video_stream->schedule_interpolated_frame(
317 next_frame_start, pts, display_func, QueueSpotHolder(this),
318 frame_lower, frame_upper, alpha,
319 secondary_frame, fade_alpha);
329 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
330 if (!got_next_clip && next_clip_callback != nullptr) {
331 tie(next_clip, next_clip_idx) = next_clip_callback();
332 if (next_clip.pts_in != -1) {
333 got_next_clip = true;
334 in_pts_start_next_clip = next_clip.pts_in;
338 // Switch to next clip if we got it.
341 clip_idx = next_clip_idx;
342 stream_idx = next_clip.stream_idx; // Override is used for previews only, and next_clip is used for live ony.
343 if (done_callback != nullptr) {
346 got_next_clip = false;
348 // Start the next clip from the point where the fade went out.
349 origin = next_frame_start;
350 in_pts_origin = in_pts_start_next_clip;
355 unique_lock<mutex> lock(queue_state_mu);
358 if (done_callback != nullptr) {
364 // Find the frame immediately before and after this point.
365 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
367 lock_guard<mutex> lock(frame_mu);
369 // Find the first frame such that frame.pts >= pts.
370 auto it = find_last_frame_before(frames[stream_idx], pts);
371 if (it == frames[stream_idx].end()) {
376 // Find the last frame such that in_pts <= frame.pts (if any).
377 if (it == frames[stream_idx].begin()) {
380 *frame_lower = *(it - 1);
382 assert(pts >= frame_lower->pts);
383 assert(pts <= frame_upper->pts);
387 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
388 : destination(destination)
390 player_thread = thread(&Player::thread_func, this, stream_output, file_avctx);
396 if (video_stream != nullptr) {
397 video_stream->stop();
399 new_clip_changed.notify_all();
400 player_thread.join();
403 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
406 lock_guard<mutex> lock(mu);
408 current_stream_idx = stream_idx;
409 current_clip_idx = clip_idx;
413 lock_guard<mutex> lock(queue_state_mu);
414 new_clip_ready = true;
415 override_stream_idx = -1;
416 new_clip_changed.notify_all();
420 void Player::override_angle(unsigned stream_idx)
422 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
424 unique_lock<mutex> lock(queue_state_mu);
425 if (new_clip_ready) {
426 lock_guard<mutex> lock2(mu);
427 current_stream_idx = stream_idx;
432 // If we are playing a clip, set override_stream_idx, and the player thread will
433 // pick it up and change its internal index.
435 unique_lock<mutex> lock(queue_state_mu);
437 override_stream_idx = stream_idx;
438 new_clip_changed.notify_all();
442 // OK, so we're standing still, presumably at the end of a clip.
443 // Look at the current pts_out (if it exists), and show the closest
447 lock_guard<mutex> lock(mu);
448 if (current_clip.pts_out < 0) {
451 pts_out = current_clip.pts_out;
454 lock_guard<mutex> lock(frame_mu);
455 auto it = find_first_frame_at_or_after(frames[stream_idx], pts_out);
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();