3 #include <condition_variable>
10 #include <movit/util.h>
12 #include "clip_list.h"
15 #include "ffmpeg_raii.h"
17 #include "jpeg_frame_view.h"
21 #include "video_stream.h"
24 using namespace std::chrono;
26 extern mutex frame_mu;
27 extern vector<int64_t> frames[MAX_STREAMS];
28 extern HTTPD *global_httpd;
30 void Player::thread_func(bool also_output_to_stream)
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 (also_output_to_stream) {
45 video_stream.reset(new VideoStream);
46 video_stream->start();
51 constexpr double output_framerate = 60000.0 / 1001.0; // FIXME: make configurable
54 bool got_next_clip = false;
55 double next_clip_fade_time = -1.0;
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 new_clip_ready && current_clip.pts_in != -1;
67 new_clip_ready = false;
71 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
72 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
75 if (video_stream != nullptr) {
76 video_stream->schedule_refresh_frame(pts);
84 lock_guard<mutex> lock(mu);
86 stream_idx = current_stream_idx;
88 steady_clock::time_point origin = steady_clock::now();
89 int64_t in_pts_origin = clip.pts_in;
91 int64_t out_pts_origin = pts;
93 // Start playing exactly at a frame.
94 // TODO: Snap secondary (fade-to) clips in the same fashion
95 // so that we don't get jank here).
97 lock_guard<mutex> lock(frame_mu);
99 // Find the first frame such that frame.pts <= in_pts.
100 auto it = lower_bound(frames[stream_idx].begin(),
101 frames[stream_idx].end(),
103 if (it != frames[stream_idx].end()) {
108 // TODO: Lock to a rational multiple of the frame rate if possible.
111 int64_t in_pts_start_next_clip = -1;
112 for (int frameno = 0; ; ++frameno) { // Ends when the clip ends.
113 double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
114 steady_clock::time_point next_frame_start =
115 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
116 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
117 pts = lrint(out_pts);
119 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
120 if (time_behind >= milliseconds(200)) {
121 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
122 lrint(1e3 * duration<double>(time_behind).count()));
126 double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
127 if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
128 // Find the next clip so that we can begin a fade.
129 next_clip = next_clip_callback();
130 if (next_clip.pts_in != -1) {
131 got_next_clip = true;
133 double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
134 next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
135 in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
139 int primary_stream_idx = stream_idx;
140 int secondary_stream_idx = -1;
141 float fade_alpha = 0.0f;
143 secondary_stream_idx = next_clip.stream_idx;
144 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
146 // If more than half-way through the fade, interpolate the next clip
147 // instead of the current one, since it's more visible.
148 if (fade_alpha >= 0.5f) {
149 swap(primary_stream_idx, secondary_stream_idx);
150 fade_alpha = 1.0f - fade_alpha;
154 int64_t secondary_pts = -1;
156 int64_t in_pts_secondary = lrint(next_clip.pts_in + TIMEBASE * frameno * speed / output_framerate);
157 int64_t in_pts_lower, in_pts_upper;
158 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
160 secondary_pts = in_pts_lower;
162 secondary_stream_idx = -1;
166 if (progress_callback != nullptr) {
167 // NOTE: None of this will take into account any snapping done below.
168 double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
169 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
170 progress_callback(played_this_clip, total_length);
173 int64_t in_pts_lower, in_pts_upper;
174 bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
175 if (!ok || in_pts_upper >= clip.pts_out) {
179 // Sleep until the next frame start, or until there's a new clip we're supposed to play.
181 unique_lock<mutex> lock(queue_state_mu);
182 new_clip_changed.wait_until(lock, next_frame_start, [this]{
183 return new_clip_ready || override_stream_idx != -1;
185 if (new_clip_ready) break;
186 if (override_stream_idx != -1) {
187 stream_idx = override_stream_idx;
188 override_stream_idx = -1;
193 if (in_pts_lower == in_pts_upper) {
194 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
195 if (video_stream != nullptr) {
196 if (secondary_stream_idx == -1) {
197 video_stream->schedule_original_frame(pts, primary_stream_idx, in_pts_lower);
199 video_stream->schedule_faded_frame(pts, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha);
205 // Snap to input frame: If we can do so with less than 1% jitter
206 // (ie., move less than 1% of an _output_ frame), do so.
207 // TODO: Snap secondary (fade-to) clips in the same fashion.
208 bool snapped = false;
209 for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
210 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
211 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
212 destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
213 if (video_stream != nullptr) {
214 if (secondary_stream_idx == -1) {
215 video_stream->schedule_original_frame(pts, primary_stream_idx, snap_pts);
217 video_stream->schedule_faded_frame(pts, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
220 in_pts_origin += snap_pts - in_pts;
229 if (time_behind >= milliseconds(100)) {
230 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
231 lrint(1e3 * duration<double>(time_behind).count()));
235 double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
237 if (video_stream == nullptr) {
238 // Previews don't do any interpolation.
239 assert(secondary_stream_idx == -1);
240 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false);
242 // Calculate the interpolated frame. When it's done, the destination
243 // will be unblocked.
244 destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
245 video_stream->schedule_interpolated_frame(pts, primary_stream_idx, in_pts_lower, in_pts_upper, alpha, secondary_stream_idx, secondary_pts, fade_alpha);
251 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
252 if (!got_next_clip && next_clip_callback != nullptr) {
253 next_clip = next_clip_callback();
254 if (next_clip.pts_in != -1) {
255 got_next_clip = true;
256 in_pts_start_next_clip = next_clip.pts_in;
260 // Switch to next clip if we got it.
263 stream_idx = next_clip.stream_idx; // Override is used for previews only, and next_clip is used for live ony.
264 if (done_callback != nullptr) {
267 got_next_clip = false;
269 // Start the next clip from the point where the fade went out.
270 origin = steady_clock::now();
271 in_pts_origin = in_pts_start_next_clip;
276 unique_lock<mutex> lock(queue_state_mu);
279 if (done_callback != nullptr) {
285 // Find the frame immediately before and after this point.
286 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
288 lock_guard<mutex> lock(frame_mu);
290 // Find the first frame such that frame.pts >= pts.
291 auto it = lower_bound(frames[stream_idx].begin(),
292 frames[stream_idx].end(),
294 if (it == frames[stream_idx].end()) {
299 // Find the last frame such that in_pts <= frame.pts (if any).
300 if (it == frames[stream_idx].begin()) {
303 *pts_lower = *(it - 1);
305 assert(pts >= *pts_lower);
306 assert(pts <= *pts_upper);
310 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
311 : destination(destination)
313 thread(&Player::thread_func, this, also_output_to_stream).detach();
316 void Player::play_clip(const Clip &clip, unsigned stream_idx)
319 lock_guard<mutex> lock(mu);
321 current_stream_idx = stream_idx;
325 lock_guard<mutex> lock(queue_state_mu);
326 new_clip_ready = true;
327 override_stream_idx = -1;
328 new_clip_changed.notify_all();
332 void Player::override_angle(unsigned stream_idx)
334 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
336 unique_lock<mutex> lock(queue_state_mu);
337 if (new_clip_ready) {
338 lock_guard<mutex> lock2(mu);
339 current_stream_idx = stream_idx;
344 // If we are playing a clip, set override_stream_idx, and the player thread will
345 // pick it up and change its internal index.
347 unique_lock<mutex> lock(queue_state_mu);
349 override_stream_idx = stream_idx;
350 new_clip_changed.notify_all();
354 // OK, so we're standing still, presumably at the end of a clip.
355 // Look at the current pts_out (if it exists), and show the closest
359 lock_guard<mutex> lock(mu);
360 if (current_clip.pts_out < 0) {
363 pts_out = current_clip.pts_out;
366 lock_guard<mutex> lock(frame_mu);
367 auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
368 if (it == frames[stream_idx].end()) {
371 destination->setFrame(stream_idx, *it, /*interpolated=*/false);