Don't interpolate&smooth playhead pos during export.

diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index 4a83bf65710ead1fe0e6112c8815c07aee25668d..41cad5b64cbb6b251037b93740a06581339c66d1 100644 (file)
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -5819,7 +5819,15 @@ Editor::super_rapid_screen_update ()
        const int64_t now = g_get_monotonic_time ();
        double err = 0;
 
+       if (_session->exporting ()) {
+               /* freewheel/export may be faster or slower than transport_speed() / SR.
+                * Also exporting multiple ranges locates/jumps without a _pending_locate_request.
+                */
+               _last_update_time = 0;
+       }
+
        if (_last_update_time > 0) {
+               /* interpolate and smoothen playhead position */
                const double ds =  (now - _last_update_time) * _session->transport_speed() * _session->nominal_frame_rate () * 1e-6;
                framepos_t guess = playhead_cursor->current_frame () + rint (ds);
                err = frame - guess;
@@ -5841,6 +5849,7 @@ Editor::super_rapid_screen_update ()
        if (err > 8192 || latent_locate) {
                // in case of x-runs or freewheeling
                _last_update_time = 0;
+               frame = _session->audible_frame ();
        } else {
                _last_update_time = now;
        }