Add forgotten eval.h...

Originally committed as revision 6387 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/eval.h

+/*
+ * simple arithmetic expression evaluator
+ *
+ * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file eval.h
+ * eval header.
+ */
+
+#ifndef AVCODEC_EVAL_H
+#define AVCODEC_EVAL_H
+
+#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
+double ff_eval(char *s, double *const_value, const char **const_name,
+               double (**func1)(void *, double), const char **func1_name,
+               double (**func2)(void *, double, double), char **func2_name,
+               void *opaque);
+#endif
+double ff_eval2(char *s, double *const_value, const char **const_name,
+               double (**func1)(void *, double), const char **func1_name,
+               double (**func2)(void *, double, double), char **func2_name,
+               void *opaque, char **error);
+
+#endif /* AVCODEC_EVAL_H */