fix an aggressive assert that crashes out when reading the wrong regions ... why are we reading the wrong regions?

git-svn-id: svn://localhost/ardour2/branches/3.0@10257 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 8 insertions, 2 deletions

diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc
index 4e02c83ed5..5d9935935e 100644
--- a/libs/ardour/audioregion.cc
+++ b/libs/ardour/audioregion.cc
@@ -400,8 +400,14 @@ AudioRegion::_read_at (const SourceList& srcs, framecnt_t limit,
 		internal_offset = 0;
 		buf_offset = _position - position;
 		/* if this fails then the requested section is entirely
-		   before the position of this region */
-		assert (cnt >= buf_offset);
+		   before the position of this region 
+		*/
+		if (cnt < buf_offset) {
+			error << "trying to read region " << name() << " @ " << position << " which is outside region bounds " 
+			      << _position << " .. " << last_frame() << " (len = " << length() << ')'
+			      << endmsg;
+			return 0; // read nothing
+		}
 		cnt -= buf_offset;
 	} else {
 		internal_offset = position - _position;