fix #6208, negative broadcast timestamps

1 files changed, 27 insertions, 3 deletions

diff --git a/libs/ardour/sndfileimportable.cc b/libs/ardour/sndfileimportable.cc
index ceb88eddc9..2c55886502 100644
--- a/libs/ardour/sndfileimportable.cc
+++ b/libs/ardour/sndfileimportable.cc
@@ -1,8 +1,10 @@
-#include "ardour/sndfileimportable.h"
 #include <sndfile.h>
 #include <iostream>
 #include <cstring>
 
+#include "pbd/error.h"
+#include "ardour/sndfileimportable.h"
+
 using namespace ARDOUR;
 using namespace std;
 
@@ -15,10 +17,32 @@ SndFileImportableSource::get_timecode_info (SNDFILE* sf, SF_BROADCAST_INFO* binf
 		return 0;
 	}
 
+	/* see http://tracker.ardour.org/view.php?id=6208
+	 * 0xffffffff 0xfffc5680
+	 * seems to be a bug in Presonus Capture (which generated the file)
+	 *
+	 * still since framepos_t is a signed int, ignore files that could
+	 * lead to negative timestamps for now.
+	 */
+
+	if (binfo->time_reference_high & 0x80000000) {
+		char tmp[64];
+		snprintf(tmp, sizeof(tmp), "%x%08x", binfo->time_reference_high, binfo->time_reference_low);
+		PBD::warning << "Invalid Timestamp " << tmp << endmsg;
+		exists = false;
+		return 0;
+	}
+
 	exists = true;
-	int64_t ret = (uint32_t) binfo->time_reference_high;
+	/* libsndfile reads eactly 4 bytes for high and low, but
+	 * uses "unsigned int" which may or may not be 32 bit little
+	 * endian.
+	 */
+	int64_t ret = (uint32_t) (binfo->time_reference_high & 0x7fffffff);
 	ret <<= 32;
-	ret |= (uint32_t) binfo->time_reference_low;
+	ret |= (uint32_t) (binfo->time_reference_low & 0xffffffff);
+
+	assert(ret >= 0);
 	return ret;
 }