try fixed crash on sample optimize

fluid/CMakeLists.txt

@@ -37,6 +37,10 @@ else (NOT MSVC)
    set(_all_h_file "${PROJECT_SOURCE_DIR}/all.h")
 endif (NOT MSVC)
 
+include_directories (
+      ${PROJECT_SOURCE_DIR}/global
+      )
+
 add_library (fluid STATIC
       ${_all_h_file}
       ${PCH}

fluid/voice.cpp

@@ -18,6 +18,8 @@
  * 02111-1307, USA
  */
 
+#include "log.h"
+
 #include "conv.h"
 #include "fluid.h"
 #include "sfont.h"
@@ -1810,6 +1812,14 @@ void Sample::optimize()
       if (!s->valid())
             return;
 
+      IF_ASSERT(s->loopstart >= s->start) {
+            s->loopstart = s->start;
+            }
+
+      IF_ASSERT(s->loopend <= s->end) {
+            s->loopend = s->end;
+            }
+
       if (!s->amplitude_that_reaches_noise_floor_is_valid) { /* Only once */
             /* Scan the loop */
             for (size_t i = s->loopstart; i < s->loopend; i++) {

global/log.h

@@ -0,0 +1,42 @@
+//=============================================================================
+//  MuseScore
+//  Music Composition & Notation
+//
+//  Copyright (C) 2020 MuseScore BVBA and others
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License version 2.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//=============================================================================
+
+#ifndef MS_LOG_H
+#define MS_LOG_H
+
+#include <QDebug>
+
+#define LOGD() qDebug()
+#define LOGI() qInfo()
+#define LOGW() qWarning()
+#define LOGE() qCritical()
+
+#define IF_ASSERT(cond) if (!(cond)) { \
+    LOGE() << "\"ASSERT FAILED!\":" << #cond << __FILE__ << __LINE__; \
+    Q_ASSERT(cond); \
+} \
+if (!(cond)) \
+
+#define IF_FAILED(cond) if (!(cond)) { \
+    LOGE() << "\"FAILED!\":" << #cond << __FILE__ << __LINE__; \
+} \
+if (!(cond)) \
+
+
+#endif // MS_LOG_H