Support per-clip variable speed.

[nageru] / futatabi / player.cpp

diff --git a/futatabi/player.cpp b/futatabi/player.cpp
index 80e77d1bda6fccf2faf2bb276e740cff05b20635..8aac5777cc7ef24cdc87db6112cf33b41d4dd1c7 100644 (file)
--- a/futatabi/player.cpp
+++ b/futatabi/player.cpp
@@ -47,7 +47,6 @@ void Player::thread_func(Player::StreamOutput stream_output, AVFormatContext *fi
 
        check_error();
 
-       constexpr double output_framerate = 60000.0 / 1001.0;  // FIXME: make configurable
        int64_t pts = 0;
        Clip next_clip;
        size_t next_clip_idx = size_t(-1);
@@ -109,16 +108,15 @@ got_clip:
                        }
                }
 
-               // TODO: Lock to a rational multiple of the frame rate if possible.
-               double speed = 0.5;
+               // TODO: Lock the speed to a rational multiple of the frame rate if possible.
 
                int64_t in_pts_start_next_clip = -1;
                steady_clock::time_point next_frame_start;
                for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
-                       double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
+                       double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
                        next_frame_start =
                                origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
-                       int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
+                       int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
                        pts = lrint(out_pts);
 
                        if (in_pts >= clip.pts_out) {
@@ -132,16 +130,16 @@ got_clip:
                                continue;
                        }
 
-                       double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
+                       double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.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.
                                tie(next_clip, next_clip_idx) = 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;
+                                       double duration_next_clip = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / clip.speed;
                                        next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
-                                       in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
+                                       in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
                                }
                        }
 
@@ -154,7 +152,7 @@ got_clip:
                        float fade_alpha = 0.0f;
                        if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
                                secondary_stream_idx = next_clip.stream_idx;
-                               int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
+                               int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
                                in_pts_secondary_for_progress = in_pts_secondary;
                                fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 
@@ -175,13 +173,13 @@ got_clip:
 
                        if (progress_callback != nullptr) {
                                // NOTE: None of this will take into account any snapping done below.
-                               double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / speed;
-                               double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
+                               double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
+                               double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
                                map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 
                                if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
-                                       double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / speed;
-                                       double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
+                                       double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / next_clip.speed;
+                                       double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / next_clip.speed;
                                        progress[next_clip_idx] = played_next_clip / total_next_length;
                                }
                                progress_callback(progress);
@@ -264,7 +262,7 @@ got_clip:
                        // TODO: Snap secondary (fade-to) clips in the same fashion.
                        bool snapped = false;
                        for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
-                               double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
+                               double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * global_flags.output_framerate / TIMEBASE / clip.speed;
                                if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
                                        auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
                                                if (destination != nullptr) {
@@ -473,3 +471,27 @@ void Player::release_queue_spot()
        --num_queued_frames;
        new_clip_changed.notify_all();
 }
+
+double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
+{
+       // Look at the last clip and then start counting from there.
+       assert(!progress.empty());
+       auto last_it = progress.end();
+       --last_it;
+       double remaining = 0.0;
+       double last_fade_time_seconds = 0.0;
+       for (size_t row = last_it->first; row < clips.size(); ++row) {
+               const Clip &clip = clips[row];
+               double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
+               if (row == last_it->first) {
+                       // A clip we're playing: Subtract the part we've already played.
+                       remaining = clip_length * (1.0 - last_it->second);
+               } else {
+                       // A clip we haven't played yet: Subtract the part that's overlapping
+                       // with a previous clip (due to fade).
+                       remaining += max(clip_length - last_fade_time_seconds, 0.0);
+               }
+               last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
+       }
+       return remaining;
+}