fix typo in c212c16eb

[ardour.git] / libs / ardour / beats_frames_converter.cc

diff --git a/libs/ardour/beats_frames_converter.cc b/libs/ardour/beats_frames_converter.cc
index 03a581e276d9f85163ce97c676c8c31f559de552..94042b1b03c0ae84ccece34fa4eaefc6f2464223 100644 (file)
--- a/libs/ardour/beats_frames_converter.cc
+++ b/libs/ardour/beats_frames_converter.cc
@@ -19,21 +19,27 @@
     $Id: midiregion.h 733 2006-08-01 17:19:38Z drobilla $
 */
 
+#include "pbd/stacktrace.h"
+
 #include "ardour/beats_frames_converter.h"
 #include "ardour/tempo.h"
 
 namespace ARDOUR {
 
-/** Takes a duration in beats and considers it as a distance from the origin
+/** Takes a positive duration in beats and considers it as a distance from the origin
  *  supplied to the constructor.  Returns the equivalent number of frames,
  *  taking tempo changes into account.
  */
-framecnt_t
+framepos_t
 BeatsFramesConverter::to (double beats) const
 {
+       if (beats < 0) {
+               std::cerr << "negative beats passed to BFC: " << beats << std::endl;
+               PBD::stacktrace (std::cerr, 30);
+       }
        assert (beats >= 0);
-
-       return _tempo_map.framepos_plus_beats (_origin_b, beats) - _origin_b;
+       framecnt_t r = _tempo_map.framepos_plus_beats (_origin_b, beats) - _origin_b;
+       return r;
 }
 
 /** Takes a duration in frames and considers it as a distance from the origin
@@ -41,9 +47,10 @@ BeatsFramesConverter::to (double beats) const
  *  taking tempo changes into account.
  */
 double
-BeatsFramesConverter::from (framecnt_t frames) const
+BeatsFramesConverter::from (framepos_t frames) const
 {
-       return _tempo_map.framewalk_to_beats (_origin_b, frames);
+       double b = _tempo_map.framewalk_to_beats (_origin_b, frames);
+       return b;
 }
 
 } /* namespace ARDOUR */