nu774 authored Dec 27, 2012 and Erik de Castro Lopo committed Dec 28, 2012

WAVEFORMATEXTENSIBLE format.

MinGW's fseeko() doesn't return error for the attempt to seek on non
seekable file (same behavior as MSVC).
The simplest solution would be to change #ifdef _MSC_VER to #ifdef
_WIN32 here.
Instead, this patch tests file with fstat(), and use fseeko() only when
it is a regular file.
This is confirmed to work properly both on MSVC and MinGW, can seek if
stdin is a redirected regular file, and doesn't require #ifdef.

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>