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.
93 for (int frameno = 0; ; ++frameno) { // Ends when the clip ends.
94 double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
95 steady_clock::time_point next_frame_start =
96 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
97 int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
100 int64_t in_pts_lower, in_pts_upper;
102 // Find the frame immediately before and after this point.
104 lock_guard<mutex> lock(frame_mu);
106 // Find the first frame such that in_pts >= frame.pts.
107 auto it = lower_bound(frames[stream_idx].begin(),
108 frames[stream_idx].end(),
110 if (it == frames[stream_idx].end() || *it >= clip.pts_out) {
115 // Find the last frame such that in_pts <= frame.pts (if any).
116 if (it == frames[stream_idx].begin()) {
119 in_pts_lower = *(it - 1);
122 assert(in_pts >= in_pts_lower);
123 assert(in_pts <= in_pts_upper);
125 // Sleep until the next frame start, or until there's a new clip we're supposed to play.
127 unique_lock<mutex> lock(queue_state_mu);
128 new_clip_changed.wait_until(lock, next_frame_start, [this]{
129 return new_clip_ready || override_stream_idx != -1;
131 if (new_clip_ready) break;
132 if (override_stream_idx != -1) {
133 stream_idx = override_stream_idx;
134 override_stream_idx = -1;
139 if (in_pts_lower == in_pts_upper) {
140 destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
141 if (video_stream != nullptr) {
142 video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_lower);
147 // Snap to input frame: If we can do so with less than 1% jitter
148 // (ie., move less than 1% of an _output_ frame), do so.
149 double in_pts_lower_as_frameno = (in_pts_lower - in_pts_origin) * output_framerate / TIMEBASE / speed;
150 double in_pts_upper_as_frameno = (in_pts_upper - in_pts_origin) * output_framerate / TIMEBASE / speed;
151 if (fabs(in_pts_lower_as_frameno - frameno) < 0.01) {
152 destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
153 if (video_stream != nullptr) {
154 video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_lower);
156 in_pts_origin += in_pts_lower - in_pts;
158 } else if (fabs(in_pts_upper_as_frameno - frameno) < 0.01) {
159 destination->setFrame(stream_idx, in_pts_upper, /*interpolated=*/false);
160 if (video_stream != nullptr) {
161 video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_upper);
163 in_pts_origin += in_pts_upper - in_pts;
167 double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
169 if (video_stream == nullptr) {
170 // Previews don't do any interpolation.
171 destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
173 // Calculate the interpolated frame. When it's done, the destination
174 // will be unblocked.
175 destination->setFrame(stream_idx, lrint(out_pts), /*interpolated=*/true);
176 video_stream->schedule_interpolated_frame(lrint(out_pts), stream_idx, in_pts_lower, in_pts_upper, alpha);
181 unique_lock<mutex> lock(queue_state_mu);
184 if (done_callback != nullptr && !aborted) {
190 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
191 : destination(destination)
193 thread(&Player::thread_func, this, also_output_to_stream).detach();
196 void Player::play_clip(const Clip &clip, unsigned stream_idx)
199 lock_guard<mutex> lock(mu);
201 current_stream_idx = stream_idx;
205 lock_guard<mutex> lock(queue_state_mu);
206 new_clip_ready = true;
207 override_stream_idx = -1;
208 new_clip_changed.notify_all();
212 void Player::override_angle(unsigned stream_idx)
214 // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
216 unique_lock<mutex> lock(queue_state_mu);
217 if (new_clip_ready) {
218 lock_guard<mutex> lock2(mu);
219 current_stream_idx = stream_idx;
224 // If we are playing a clip, set override_stream_idx, and the player thread will
225 // pick it up and change its internal index.
227 unique_lock<mutex> lock(queue_state_mu);
229 override_stream_idx = stream_idx;
230 new_clip_changed.notify_all();
234 // OK, so we're standing still, presumably at the end of a clip.
235 // Look at the current pts_out (if it exists), and show the closest
239 lock_guard<mutex> lock(mu);
240 if (current_clip.pts_out < 0) {
243 pts_out = current_clip.pts_out;
246 lock_guard<mutex> lock(frame_mu);
247 auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
248 if (it == frames[stream_idx].end()) {
251 destination->setFrame(stream_idx, *it, /*interpolated=*/false);