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
55 // Wait until we're supposed to play something.
57 unique_lock<mutex> lock(queue_state_mu);
58 new_clip_changed.wait(lock, [this]{
59 return new_clip_ready && current_clip.pts_in != -1;
61 new_clip_ready = false;
68 lock_guard<mutex> lock(mu);
70 stream_idx = current_stream_idx;
72 steady_clock::time_point origin = steady_clock::now();
73 int64_t in_pts_origin = clip.pts_in;
74 int64_t out_pts_origin = pts;
76 // Start playing exactly at a frame.
78 lock_guard<mutex> lock(frame_mu);
80 // Find the first frame such that frame.pts <= in_pts.
81 auto it = lower_bound(frames[stream_idx].begin(),
82 frames[stream_idx].end(),
84 if (it != frames[stream_idx].end()) {
89 // TODO: Lock to a rational multiple of the frame rate if possible.
92 for (int frameno = 0; ; ++frameno) { // Ends when the clip ends.
93 double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
94 steady_clock::time_point next_frame_start =
95 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
96 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
99 steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
100 if (time_behind >= milliseconds(200)) {
101 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
102 lrint(1e3 * duration<double>(time_behind).count()));
106 int64_t in_pts_lower, in_pts_upper;
107 bool ok = find_surrounding_frames(in_pts, stream_idx, &in_pts_lower, &in_pts_upper);
108 if (!ok || in_pts_upper >= clip.pts_out) {
112 // Sleep until the next frame start, or until there's a new clip we're supposed to play.
114 unique_lock<mutex> lock(queue_state_mu);
115 new_clip_changed.wait_until(lock, next_frame_start, [this]{
116 return new_clip_ready || override_stream_idx != -1;
118 if (new_clip_ready) break;
119 if (override_stream_idx != -1) {
120 stream_idx = override_stream_idx;
121 override_stream_idx = -1;
126 if (progress_callback != nullptr) {
127 // NOTE: None of this will take into account any snapping done below.
128 double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
129 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
130 progress_callback(played_this_clip, total_length);
133 if (in_pts_lower == in_pts_upper) {
134 destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
135 if (video_stream != nullptr) {
136 video_stream->schedule_original_frame(pts, stream_idx, in_pts_lower);
141 // Snap to input frame: If we can do so with less than 1% jitter
142 // (ie., move less than 1% of an _output_ frame), do so.
143 bool snapped = false;
144 for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
145 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
146 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
147 destination->setFrame(stream_idx, snap_pts, /*interpolated=*/false);
148 if (video_stream != nullptr) {
149 video_stream->schedule_original_frame(pts, stream_idx, snap_pts);
151 in_pts_origin += snap_pts - in_pts;
160 if (time_behind >= milliseconds(100)) {
161 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
162 lrint(1e3 * duration<double>(time_behind).count()));
166 double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
168 if (video_stream == nullptr) {
169 // Previews don't do any interpolation.
170 destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
172 // Calculate the interpolated frame. When it's done, the destination
173 // will be unblocked.
174 destination->setFrame(stream_idx, pts, /*interpolated=*/true);
175 video_stream->schedule_interpolated_frame(pts, stream_idx, in_pts_lower, in_pts_upper, alpha);
180 unique_lock<mutex> lock(queue_state_mu);
183 if (done_callback != nullptr) {
189 // Find the frame immediately before and after this point.
190 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
192 lock_guard<mutex> lock(frame_mu);
194 // Find the first frame such that frame.pts >= pts.
195 auto it = lower_bound(frames[stream_idx].begin(),
196 frames[stream_idx].end(),
198 if (it == frames[stream_idx].end()) {
203 // Find the last frame such that in_pts <= frame.pts (if any).
204 if (it == frames[stream_idx].begin()) {
207 *pts_lower = *(it - 1);
209 assert(pts >= *pts_lower);
210 assert(pts <= *pts_upper);
214 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
215 : destination(destination)
217 thread(&Player::thread_func, this, also_output_to_stream).detach();
220 void Player::play_clip(const Clip &clip, unsigned stream_idx)
223 lock_guard<mutex> lock(mu);
225 current_stream_idx = stream_idx;
229 lock_guard<mutex> lock(queue_state_mu);
230 new_clip_ready = true;
231 override_stream_idx = -1;
232 new_clip_changed.notify_all();
236 void Player::override_angle(unsigned stream_idx)
238 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
240 unique_lock<mutex> lock(queue_state_mu);
241 if (new_clip_ready) {
242 lock_guard<mutex> lock2(mu);
243 current_stream_idx = stream_idx;
248 // If we are playing a clip, set override_stream_idx, and the player thread will
249 // pick it up and change its internal index.
251 unique_lock<mutex> lock(queue_state_mu);
253 override_stream_idx = stream_idx;
254 new_clip_changed.notify_all();
258 // OK, so we're standing still, presumably at the end of a clip.
259 // Look at the current pts_out (if it exists), and show the closest
263 lock_guard<mutex> lock(mu);
264 if (current_clip.pts_out < 0) {
267 pts_out = current_clip.pts_out;
270 lock_guard<mutex> lock(frame_mu);
271 auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
272 if (it == frames[stream_idx].end()) {
275 destination->setFrame(stream_idx, *it, /*interpolated=*/false);