+
+void export_interpolated_clip(const string &filename, const Clip &clip)
+{
+ AVFormatContext *avctx = nullptr;
+ avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
+ if (avctx == nullptr) {
+ QMessageBox msgbox;
+ msgbox.setText("Could not allocate FFmpeg context");
+ msgbox.exec();
+ return;
+ }
+ AVFormatContextWithCloser closer(avctx);
+
+ int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
+ if (ret < 0) {
+ QMessageBox msgbox;
+ msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
+ msgbox.exec();
+ return;
+ }
+
+ QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
+ progress.setWindowTitle("Futatabi");
+ progress.setWindowModality(Qt::WindowModal);
+ progress.setMinimumDuration(1000);
+ progress.setMaximum(100000);
+ progress.setValue(0);
+
+ promise<void> done_promise;
+ future<void> done = done_promise.get_future();
+ std::atomic<double> current_value{0.0};
+
+ unique_ptr<Player> player(new Player(/*destination=*/nullptr, Player::FILE_STREAM_OUTPUT, closer.release()));
+ player->set_done_callback([&done_promise] {
+ done_promise.set_value();
+ });
+ player->set_progress_callback([¤t_value] (const std::map<size_t, double> &player_progress) {
+ assert(player_progress.size() == 1);
+ current_value = player_progress.begin()->second;
+ });
+ player->play_clip(clip, /*clip_idx=*/0, clip.stream_idx);
+ while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
+ progress.setValue(lrint(100000.0 * current_value));
+ }
+ if (progress.wasCanceled()) {
+ unlink(filename.c_str());
+ player.reset();
+ return;
+ }
+}