void Player::thread_func(bool also_output_to_stream)
{
+ pthread_setname_np(pthread_self(), "Player");
+
QSurface *surface = create_surface();
QOpenGLContext *context = create_context(surface);
if (!make_current(context, surface)) {
check_error();
+ constexpr double output_framerate = 60000.0 / 1001.0; // FIXME: make configurable
+ int64_t pts = 0;
+
for ( ;; ) {
// Wait until we're supposed to play something.
{
stream_idx = current_stream_idx;
}
steady_clock::time_point origin = steady_clock::now();
- int64_t pts_origin = clip.pts_in;
+ int64_t in_pts_origin = clip.pts_in;
+ int64_t out_pts_origin = pts;
- int64_t next_pts = pts_origin - 1; // Make sure we play the frame at clip.pts_in if it exists.
+ // Start playing exactly at a frame.
+ {
+ lock_guard<mutex> lock(frame_mu);
- bool aborted = false;
- for ( ;; ) {
- // Find the next frame.
- {
- lock_guard<mutex> lock(frame_mu);
- auto it = upper_bound(frames[stream_idx].begin(),
- frames[stream_idx].end(),
- next_pts);
- if (it == frames[stream_idx].end() || *it >= clip.pts_out) {
- break;
- }
- next_pts = *it;
+ // Find the first frame such that frame.pts <= in_pts.
+ auto it = lower_bound(frames[stream_idx].begin(),
+ frames[stream_idx].end(),
+ in_pts_origin);
+ if (it != frames[stream_idx].end()) {
+ in_pts_origin = *it;
}
+ }
+
+ // TODO: Lock to a rational multiple of the frame rate if possible.
+ double speed = 0.5;
- double speed = 0.5;
+ bool aborted = false;
+ for (int frameno = 0; ; ++frameno) { // Ends when the clip ends.
+ double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
steady_clock::time_point next_frame_start =
- origin + microseconds((next_pts - pts_origin) * int(1000000 / speed) / TIMEBASE);
+ origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
+ int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
+ pts = lrint(out_pts);
+
+ steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
+ if (time_behind >= milliseconds(200)) {
+ fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
+ lrint(1e3 * duration<double>(time_behind).count()));
+ continue;
+ }
+
+ int64_t in_pts_lower, in_pts_upper;
+ bool ok = find_surrounding_frames(in_pts, stream_idx, &in_pts_lower, &in_pts_upper);
+ if (!ok || in_pts_upper >= clip.pts_out) {
+ break;
+ }
// Sleep until the next frame start, or until there's a new clip we're supposed to play.
{
}
}
- destination->setFrame(stream_idx, next_pts);
-
- if (video_stream != nullptr) {
- // Send the frame to the stream.
- // FIXME: Vaguely less crazy pts, perhaps.
- double pts_float = fmod(duration<double>(next_frame_start.time_since_epoch()).count(), 86400.0f);
- int64_t pts = lrint(pts_float * TIMEBASE);
- video_stream->schedule_original_frame(pts, stream_idx, next_pts);
-
- // HACK: test interpolation by frame-doubling.
- int64_t next_next_pts = -1;
- {
- lock_guard<mutex> lock(frame_mu);
- auto it = upper_bound(frames[stream_idx].begin(),
- frames[stream_idx].end(),
- next_pts);
- if (it == frames[stream_idx].end() || *it >= clip.pts_out) {
- break;
- }
- next_next_pts = *it;
+ if (progress_callback != nullptr) {
+ // NOTE: None of this will take into account any snapping done below.
+ double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
+ double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
+ progress_callback(played_this_clip, total_length);
+ }
+
+ if (in_pts_lower == in_pts_upper) {
+ destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
+ if (video_stream != nullptr) {
+ video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_lower);
+ }
+ continue;
+ }
+
+ // Snap to input frame: If we can do so with less than 1% jitter
+ // (ie., move less than 1% of an _output_ frame), do so.
+ double in_pts_lower_as_frameno = (in_pts_lower - in_pts_origin) * output_framerate / TIMEBASE / speed;
+ double in_pts_upper_as_frameno = (in_pts_upper - in_pts_origin) * output_framerate / TIMEBASE / speed;
+ if (fabs(in_pts_lower_as_frameno - frameno) < 0.01) {
+ destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
+ if (video_stream != nullptr) {
+ video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_lower);
}
- if (next_next_pts != -1) {
- auto frame_len = microseconds((next_next_pts - next_pts) * int(1000000 / speed) / TIMEBASE) / 2;
- int64_t interpolated_pts = pts + lrint(duration<double>(frame_len).count() * TIMEBASE);
- video_stream->schedule_interpolated_frame(interpolated_pts, stream_idx, next_pts, next_next_pts, 0.5f);
+ in_pts_origin += in_pts_lower - in_pts;
+ continue;
+ } else if (fabs(in_pts_upper_as_frameno - frameno) < 0.01) {
+ destination->setFrame(stream_idx, in_pts_upper, /*interpolated=*/false);
+ if (video_stream != nullptr) {
+ video_stream->schedule_original_frame(lrint(out_pts), stream_idx, in_pts_upper);
}
+ in_pts_origin += in_pts_upper - in_pts;
+ continue;
+ }
+
+ if (time_behind >= milliseconds(100)) {
+ fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
+ lrint(1e3 * duration<double>(time_behind).count()));
+ continue;
+ }
+
+ double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
+
+ if (video_stream == nullptr) {
+ // Previews don't do any interpolation.
+ destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
+ } else {
+ // Calculate the interpolated frame. When it's done, the destination
+ // will be unblocked.
+ destination->setFrame(stream_idx, lrint(out_pts), /*interpolated=*/true);
+ video_stream->schedule_interpolated_frame(lrint(out_pts), stream_idx, in_pts_lower, in_pts_upper, alpha);
}
}
}
}
+// Find the frame immediately before and after this point.
+bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
+{
+ lock_guard<mutex> lock(frame_mu);
+
+ // Find the first frame such that frame.pts >= pts.
+ auto it = lower_bound(frames[stream_idx].begin(),
+ frames[stream_idx].end(),
+ pts);
+ if (it == frames[stream_idx].end()) {
+ return false;
+ }
+ *pts_upper = *it;
+
+ // Find the last frame such that in_pts <= frame.pts (if any).
+ if (it == frames[stream_idx].begin()) {
+ *pts_lower = *it;
+ } else {
+ *pts_lower = *(it - 1);
+ }
+ assert(pts >= *pts_lower);
+ assert(pts <= *pts_upper);
+ return true;
+}
+
Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
: destination(destination)
{
if (it == frames[stream_idx].end()) {
return;
}
- destination->setFrame(stream_idx, *it);
+ destination->setFrame(stream_idx, *it, /*interpolated=*/false);
}
projects / nageru / blobdiff