If we don't know the length of a song from the metadata, get it from the pipeline which has the real length. Fixes #2818 when the length isn't in the podcast metadata.

src/engines/gstengine.cpp

@@ -192,15 +192,21 @@ void GstEngine::ReloadSettings() {
 qint64 GstEngine::position_nanosec() const {
   if (!current_pipeline_) return 0;
 
-  qint64 result = current_pipeline_->position() - beginning_nanosec_;
+  const qint64 result = current_pipeline_->position() - beginning_nanosec_;
   return qint64(qMax(0ll, result));
 }
 
 qint64 GstEngine::length_nanosec() const {
   if (!current_pipeline_) return 0;
 
-  qint64 result = end_nanosec_ - beginning_nanosec_;
-  return qint64(qMax(0ll, result));
+  const qint64 result = end_nanosec_ - beginning_nanosec_;
+
+  if (result > 0) {
+    return result;
+  } else {
+    // Get the length from the pipeline if we don't know.
+    return current_pipeline_->length();
+  }
 }
 
 Engine::State GstEngine::state() const {

src/ui/mainwindow.cpp

@@ -1280,7 +1280,7 @@ void MainWindow::UpdateTrackPosition() {
   PlaylistItemPtr item(app_->player()->GetCurrentItem());
   const int position = std::floor(
       float(app_->player()->engine()->position_nanosec()) / kNsecPerSec + 0.5);
-  const int length = item->Metadata().length_nanosec() / kNsecPerSec;
+  const int length = app_->player()->engine()->length_nanosec() / kNsecPerSec;
   const int scrobble_point = playlist->scrobble_point_nanosec() / kNsecPerSec;
 
   if (length <= 0) {
@@ -1339,7 +1339,8 @@ void MainWindow::UpdateTrackSliderPosition() {
 
   const int slider_position = std::floor(
       float(app_->player()->engine()->position_nanosec()) / kNsecPerMsec);
-  const int slider_length = item->Metadata().length_nanosec() / kNsecPerMsec;
+  const int slider_length =
+      app_->player()->engine()->length_nanosec() / kNsecPerMsec;
 
   // Update the slider
   ui_->track_slider->SetValue(slider_position, slider_length);