- if( local_session->preview_end > length ) local_session->preview_end = length;
- if( local_session->preview_start >= local_session->preview_end ) {
- local_session->preview_start = 0;
- local_session->preview_end = length;
- }
+ double preview_start = local_session->preview_start;
+ double preview_end = local_session->preview_end;
+ if( preview_end < 0 || preview_end > length )
+ preview_end = length;
+ if( preview_start == 0 && preview_end >= length )
+ local_session->preview_end = -1;
+ if( preview_start > preview_end )
+ local_session->preview_start = preview_end;