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diff --git a/src/libsndfile-virtual.ads b/src/libsndfile-virtual.ads
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+
+
+--  Programmed by Jedidiah Barber
+--  Released into the public domain
+
+
+private with
+
+    Interfaces,
+    System;
+
+
+package Libsndfile.Virtual is
+
+
+    ---------------------------------
+    --  Data Types and Structures  --
+    ---------------------------------
+
+    type Virtual_Sound_File is new Sound_File with private;
+
+    type File_Length_Function is access function
+        return Count_Type;
+
+    type Seek_Function is access function
+           (Offset : in Count_Type;
+            Whence : in Seek_From)
+        return Count_Type;
+
+    type Read_Function is access function
+           (Data  :    out Raw_Data;
+            Bytes : in     Count_Type)
+        return Count_Type;
+
+    type Write_Function is access function
+           (Data  : in Raw_Data;
+            Bytes : in Count_Type)
+        return Count_Type;
+
+    type Tell_Function is access function
+        return Count_Type;
+
+
+
+
+    ---------------------
+    --  API Interface  --
+    ---------------------
+
+    procedure Open
+           (File   : in out Virtual_Sound_File;
+            Mode   : in     File_Mode;
+            Info   : in out File_Info;
+            Length : in     File_Length_Function;
+            Seek   : in     Seek_Function;
+            Read   : in     Read_Function;
+            Write  : in     Write_Function;
+            Tell   : in     Tell_Function)
+    with Pre => not Is_Open (File),
+        Post => Is_Open (File);
+
+
+private
+
+
+    type Virtual_Data is limited record
+        My_Length : File_Length_Function;
+        My_Seek   : Seek_Function;
+        My_Read   : Read_Function;
+        My_Write  : Write_Function;
+        My_Tell   : Tell_Function;
+    end record with Convention => C;
+
+
+    type Virtual_Sound_File is new Sound_File with record
+        My_Virtual : Virtual_Data;
+    end record;
+
+
+
+
+    function Ada_Filelen_Hook
+           (Data : in System.Address)
+        return Interfaces.Integer_64;
+    pragma Export (C, Ada_Filelen_Hook, "ada_filelen_hook");
+
+    function Ada_Seek_Hook
+           (Offset : in Interfaces.Integer_64;
+            Whence : in Interfaces.C.int;
+            Data   : in System.Address)
+        return Interfaces.Integer_64;
+    pragma Export (C, Ada_Seek_Hook, "ada_seek_hook");
+
+    function Ada_Read_Hook
+           (Ptr   : in System.Address;
+            Count : in Interfaces.Integer_64;
+            Data  : in System.Address)
+        return Interfaces.Integer_64;
+    pragma Export (C, Ada_Read_Hook, "ada_read_hook");
+
+    function Ada_Write_Hook
+           (Ptr   : in System.Address;
+            Count : in Interfaces.Integer_64;
+            Data  : in System.Address)
+        return Interfaces.Integer_64;
+    pragma Export (C, Ada_Write_Hook, "ada_write_hook");
+
+    function Ada_Tell_Hook
+           (Data : in System.Address)
+        return Interfaces.Integer_64;
+    pragma Export (C, Ada_Tell_Hook, "ada_tell_hook");
+
+
+end Libsndfile.Virtual;
+
+