constexpr double output_framerate = 60000.0 / 1001.0; // FIXME: make configurable
int64_t pts = 0;
+ Clip next_clip;
+ bool got_next_clip = false;
+ double next_clip_fade_time = -1.0;
for ( ;; ) {
// Wait until we're supposed to play something.
clip = current_clip;
stream_idx = current_stream_idx;
}
+got_clip:
steady_clock::time_point origin = steady_clock::now();
int64_t in_pts_origin = clip.pts_in;
int64_t out_pts_origin = pts;
// TODO: Lock to a rational multiple of the frame rate if possible.
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 =
continue;
}
+ double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
+ if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
+ // Find the next clip so that we can begin a fade.
+ next_clip = next_clip_callback();
+ if (next_clip.pts_in != -1) {
+ got_next_clip = true;
+
+ double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
+ next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
+ }
+ }
+
+ int primary_stream_idx = stream_idx;
+ int secondary_stream_idx = -1;
+ float fade_alpha = 0.0f;
+ if (got_next_clip) {
+ secondary_stream_idx = next_clip.stream_idx;
+ fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
+
+ // If more than half-way through the fade, interpolate the next clip
+ // instead of the current one, since it's more visible.
+ if (fade_alpha >= 0.5f) {
+ swap(primary_stream_idx, secondary_stream_idx);
+ fade_alpha = 1.0f - fade_alpha;
+ }
+ }
+
+ int64_t secondary_pts = -1;
+ if (got_next_clip) {
+ int64_t in_pts_lower, in_pts_upper;
+ bool ok = find_surrounding_frames(in_pts, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
+ if (ok) {
+ secondary_pts = in_pts_lower;
+ } else {
+ secondary_stream_idx = -1;
+ }
+ }
+
+ 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);
+ }
+
int64_t in_pts_lower, in_pts_upper;
- bool ok = find_surrounding_frames(in_pts, stream_idx, &in_pts_lower, &in_pts_upper);
+ bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
if (!ok || in_pts_upper >= clip.pts_out) {
break;
}
}
}
- 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);
+ destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
if (video_stream != nullptr) {
- video_stream->schedule_original_frame(pts, stream_idx, in_pts_lower);
+ if (secondary_stream_idx == -1) {
+ video_stream->schedule_original_frame(pts, primary_stream_idx, in_pts_lower);
+ } else {
+ video_stream->schedule_faded_frame(pts, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha);
+ }
}
continue;
}
for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
- destination->setFrame(stream_idx, snap_pts, /*interpolated=*/false);
+ destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
if (video_stream != nullptr) {
- video_stream->schedule_original_frame(pts, stream_idx, snap_pts);
+ if (secondary_stream_idx == -1) {
+ video_stream->schedule_original_frame(pts, primary_stream_idx, snap_pts);
+ } else {
+ video_stream->schedule_faded_frame(pts, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
+ }
}
in_pts_origin += snap_pts - in_pts;
snapped = true;
if (video_stream == nullptr) {
// Previews don't do any interpolation.
- destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
+ assert(secondary_stream_idx == -1);
+ destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, fade_alpha);
} else {
// Calculate the interpolated frame. When it's done, the destination
// will be unblocked.
- destination->setFrame(stream_idx, pts, /*interpolated=*/true);
- video_stream->schedule_interpolated_frame(pts, stream_idx, in_pts_lower, in_pts_upper, alpha);
+ destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
+ video_stream->schedule_interpolated_frame(pts, primary_stream_idx, in_pts_lower, in_pts_upper, alpha, secondary_stream_idx, secondary_pts, fade_alpha);
+ }
+ }
+
+ // The clip ended.
+
+ // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
+ if (!got_next_clip && next_clip_callback != nullptr) {
+ next_clip = next_clip_callback();
+ if (next_clip.pts_in != -1) {
+ got_next_clip = true;
+ }
+ }
+
+ // Switch to next clip if we got it.
+ if (got_next_clip) {
+ clip = next_clip;
+ stream_idx = next_clip.stream_idx; // Override is used for previews only, and next_clip is used for live ony.
+ if (done_callback != nullptr) {
+ done_callback();
}
+ got_next_clip = false;
+ goto got_clip;
}
{
unique_lock<mutex> lock(queue_state_mu);
playing = false;
}
- if (done_callback != nullptr && !aborted) {
+ if (done_callback != nullptr) {
done_callback();
}
}
projects / nageru / blobdiff