diff options
| author | Anton Khirnov <anton@khirnov.net> | 2013-11-14 12:19:04 +0100 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2014-03-10 10:27:17 +0100 |
| commit | e854b8f9f4097a3c560b746895e9da6721aa4cdb (patch) | |
| tree | 003241c26cefa79a5cbd2c27a462c42022ea9109 /compat | |
| parent | 8cafeb8bca5d079041739dbd72ccec0ead138eaf (diff) | |
| download | ffmpeg-e854b8f9f4097a3c560b746895e9da6721aa4cdb.tar.gz | |
Work around broken floating point limits on some systems.
The values of {FLT,DBL}_{MAX,MIN} macros on some systems (older musl
libc, some BSD flavours) are not exactly representable, i.e.
(double)DBL_MAX == DBL_MAX is false
This violates (at least some interpretations of) the C99 standard and
breaks code (e.g. in vf_fps) like
double f = DBL_MAX;
[...]
if (f == DBL_MAX) { // f has not been changed yet
[....]
}
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/float/float.h | 35 | ||||
| -rw-r--r-- | compat/float/limits.h | 22 |
2 files changed, 57 insertions, 0 deletions
diff --git a/compat/float/float.h b/compat/float/float.h new file mode 100644 index 0000000000..c69f728e32 --- /dev/null +++ b/compat/float/float.h @@ -0,0 +1,35 @@ +/* + * Work around broken floating point limits on some systems. + * + * This file is part of Libav. + * + * Libav 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 2.1 of the License, or (at your option) any later version. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include_next <float.h> + +#ifdef FLT_MAX +#undef FLT_MAX +#define FLT_MAX 3.40282346638528859812e+38F + +#undef FLT_MIN +#define FLT_MIN 1.17549435082228750797e-38F + +#undef DBL_MAX +#define DBL_MAX ((double)1.79769313486231570815e+308L) + +#undef DBL_MIN +#define DBL_MIN ((double)2.22507385850720138309e-308L) +#endif diff --git a/compat/float/limits.h b/compat/float/limits.h new file mode 100644 index 0000000000..9150bc8134 --- /dev/null +++ b/compat/float/limits.h @@ -0,0 +1,22 @@ +/* + * Work around broken floating point limits on some systems. + * + * This file is part of Libav. + * + * Libav 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 2.1 of the License, or (at your option) any later version. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include_next <limits.h> +#include <float.h> |