[FFmpeg-cvslog] libx264: Define X264_API_IMPORTS on MSVC/ICL

[Derek Buitenhuis]

ffmpeg | branch: master | Derek Buitenhuis <derek.buitenhuis at gmail.com> | Fri Jul 19 14:25:57 2013 -0400| [4719040cd1b54381796b22056a9ae37bd2b4668d] | committer: Derek Buitenhuis

libx264: Define X264_API_IMPORTS on MSVC/ICL

libx264 has a few data exports which require X264_API_IMPORTS
to be defined if we link to libx264 dynamically on Windows.

In a similar fashion to how we handle our compat snprintf
implementation, if we define it all the time, the compiler
will first try and link to __imp_x264_symbol_name, and failing
that, as in the case of a static libx264, will attempt to link
to the non-prefixed symbol, which has already been pulled in by
other x264 functions' object files.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4719040cd1b54381796b22056a9ae37bd2b4668d
---

 libavcodec/libx264.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index bb92110..665b31e 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -25,6 +25,11 @@
 #include "libavutil/pixdesc.h"
 #include "avcodec.h"
 #include "internal.h"
+
+#if defined(_MSC_VER)
+#define X264_API_IMPORTS 1
+#endif
+
 #include <x264.h>
 #include <float.h>
 #include <math.h>