diff --git a/FFmpegSource/stdiostream.c b/FFmpegSource/stdiostream.c
index 3002d9f03..98200e533 100644
--- a/FFmpegSource/stdiostream.c
+++ b/FFmpegSource/stdiostream.c
@@ -1,12 +1,4 @@
-/* first we need to create an I/O object that the parser will use to read the
- * source file
- */
-struct StdIoStream {
-  struct InputStream  base;
-  FILE		      *fp;
-  int		      error;
-};
-typedef struct StdIoStream StdIoStream;
+#include "stdiostream.h"
 
 #define	CACHESIZE     65536
 
@@ -79,4 +71,4 @@ void  StdIoFree(StdIoStream *st, void *mem) {
  */
 int   StdIoProgress(StdIoStream *st, ulonglong cur, ulonglong max) {
   return 1;
-}
\ No newline at end of file
+}
diff --git a/FFmpegSource/stdiostream.h b/FFmpegSource/stdiostream.h
new file mode 100644
index 000000000..3a5fc35db
--- /dev/null
+++ b/FFmpegSource/stdiostream.h
@@ -0,0 +1,58 @@
+#ifndef STDIOSTREAM_H
+#define STDIOSTREAM_H
+
+#include "MatroskaParser.h"
+
+
+/************\
+* Structures *
+\************/
+
+
+/* first we need to create an I/O object that the parser will use to read the
+ * source file
+ */
+struct StdIoStream {
+  struct InputStream  base;
+  FILE		      *fp;
+  int		      error;
+};
+
+typedef struct StdIoStream StdIoStream;
+
+
+
+/***********\
+* Functions *
+\***********/
+
+/* read count bytes into buffer starting at file position pos
+ * return the number of bytes read, -1 on error or 0 on EOF
+ */
+int StdIoRead(StdIoStream *st, ulonglong pos, void *buffer, int count);
+
+/* scan for a signature sig(big-endian) starting at file position pos
+ * return position of the first byte of signature or -1 if error/not found
+ */
+longlong StdIoScan(StdIoStream *st, ulonglong start, unsigned signature);
+
+/* return cache size, this is used to limit readahead */
+unsigned StdIoGetCacheSize(StdIoStream *st);
+
+/* return last error message */
+const char *StdIoGetLastError(StdIoStream *st);
+
+/* memory allocation, this is done via stdlib */
+void  *StdIoMalloc(StdIoStream *st, size_t size);
+
+void  *StdIoRealloc(StdIoStream *st, void *mem, size_t size);
+
+void  StdIoFree(StdIoStream *st, void *mem);
+
+/* progress report handler for lengthy operations
+ * returns 0 to abort operation, nonzero to continue
+ */
+int   StdIoProgress(StdIoStream *st, ulonglong cur, ulonglong max);
+
+
+#endif /* #ifndef STDIOSTREAM_H */