4 files changed, 35 insertions, 0 deletions
diff --git a/libs/ardour/ardour/smf_source.h b/libs/ardour/ardour/smf_source.h
index 9c0a78f282..a068a3e385 100644
--- a/libs/ardour/ardour/smf_source.h
+++ b/libs/ardour/ardour/smf_source.h
@@ -77,6 +77,7 @@ public:
 	void ensure_disk_file ();
 
 	static bool safe_midi_file_extension (const std::string& path);
+	static bool valid_midi_file (const std::string& path);
 
 	void prevent_deletion ();
 
diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index d52923c302..c3bc78c83d 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -34,6 +34,7 @@
 #include <glibmm/fileutils.h>
 
 #include "evoral/Control.hpp"
+#include "evoral/evoral/SMF.hpp"
 
 #include "ardour/event_type_map.h"
 #include "ardour/midi_model.h"
@@ -48,6 +49,7 @@
 using namespace ARDOUR;
 using namespace Glib;
 using namespace PBD;
+using namespace Evoral;
 
 /** Constructor used for new internal-to-session files.  File cannot exist. */
 SMFSource::SMFSource (Session& s, const string& path, Source::Flag flags)
@@ -497,6 +499,15 @@ SMFSource::mark_midi_streaming_write_completed (Evoral::Sequence<Evoral::Musical
 }
 
 bool
+SMFSource::valid_midi_file (const string& file)
+{
+	if (safe_midi_file_extension (file) ) {
+		return (SMF::test (file) );
+	}
+	return false;
+}
+
+bool
 SMFSource::safe_midi_file_extension (const string& file)
 {
 	static regex_t compiled_pattern;
diff --git a/libs/evoral/evoral/SMF.hpp b/libs/evoral/evoral/SMF.hpp
index 8bd05444c4..02d0710409 100644
--- a/libs/evoral/evoral/SMF.hpp
+++ b/libs/evoral/evoral/SMF.hpp
@@ -50,6 +50,7 @@ public:
 	SMF() : _smf(0), _smf_track(0), _empty(true) {};
 	virtual ~SMF();
 
+	static bool test(const std::string& path);
 	int  open(const std::string& path, int track=1) THROW_FILE_ERROR;
 	int  create(const std::string& path, int track=1, uint16_t ppqn=19200) THROW_FILE_ERROR;
 	void close() THROW_FILE_ERROR;
diff --git a/libs/evoral/src/SMF.cpp b/libs/evoral/src/SMF.cpp
index b84507818c..6557a01b80 100644
--- a/libs/evoral/src/SMF.cpp
+++ b/libs/evoral/src/SMF.cpp
@@ -67,6 +67,28 @@ SMF::seek_to_track(int track)
 	}
 }
 
+/** Attempt to open the SMF file just to see if it is valid.
+ *
+ * \return  true on success
+ *          false on failure
+ */
+bool
+SMF::test(const std::string& path)
+{
+	PBD::StdioFileDescriptor d (path, "r");
+	FILE* f = d.allocate ();
+	if (f == 0) {
+		return false;
+	}
+
+	smf_t* test_smf;
+	if ((test_smf = smf_load (f)) == NULL) {
+		return false;
+	}
+	smf_delete (test_smf);
+	return true;
+}
+
 /** Attempt to open the SMF file for reading and/or writing.
  *
  * \return  0 on success