Handle unicode file names on windows

All file names should be in UTF-8 within libavformat.

This is handled by mapping the open() function to an internal one
in os_support.h for windows.

fopen() could be overridden in the same way, but if that would be
used from ffmpeg.c, it would add a dependency on an ff prefixed
internal lavf function.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 28 insertions, 0 deletions

diff --git a/libavformat/os_support.c b/libavformat/os_support.c
index 5a3a1bbfe0..05577b7553 100644
--- a/libavformat/os_support.c
+++ b/libavformat/os_support.c
@@ -28,6 +28,34 @@
 #include "avformat.h"
 #include "os_support.h"
 
+#if defined(_WIN32) && !defined(__MINGW32CE__)
+#include <windows.h>
+
+#undef open
+int ff_win32_open(const char *filename_utf8, int oflag, int pmode)
+{
+    int fd;
+    int num_chars;
+    wchar_t *filename_w;
+
+    /* convert UTF-8 to wide chars */
+    num_chars = MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, NULL, 0);
+    if (num_chars <= 0)
+        return -1;
+    filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
+    MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
+
+    fd = _wopen(filename_w, oflag, pmode);
+    av_freep(&filename_w);
+
+    /* filename maybe be in CP_ACP */
+    if (fd == -1 && !(oflag & O_CREAT))
+        return open(filename_utf8, oflag, pmode);
+
+    return fd;
+}
+#endif
+
 #if CONFIG_NETWORK
 #include <fcntl.h>
 #include <unistd.h>