--- a
+++ b/src/decoder.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2000, 2001 Martin Norbäck, Hĺkan Hjort
+ * 
+ * This file is part of libdvdnav, a DVD navigation library. It is modified
+ * from a file originally part of the Ogle DVD player.
+ * 
+ * libdvdnav is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * libdvdnav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
+ *
+ * $Id$
+ *
+ */
+
+#ifndef DECODER_H_INCLUDED
+#define DECODER_H_INCLUDED
+
+#include "config.h"
+#include <inttypes.h>
+#include <dvdread/ifo_types.h> /*  vm_cmd_t */
+
+/* Uncomment for tracing */
+#define TRACE 
+
+typedef enum {
+  LinkNoLink  = 0,
+
+  LinkTopC    = 1,
+  LinkNextC   = 2,
+  LinkPrevC   = 3,
+
+  LinkTopPG   = 5,
+  LinkNextPG  = 6,
+  LinkPrevPG  = 7,
+
+  LinkTopPGC  = 9,
+  LinkNextPGC = 10,
+  LinkPrevPGC = 11,
+  LinkGoUpPGC = 12,
+  LinkTailPGC = 13,
+
+  LinkRSM     = 16,
+
+  LinkPGCN,
+  LinkPTTN,
+  LinkPGN,
+  LinkCN,
+
+  Exit,
+
+  JumpTT, /* 22 */
+  JumpVTS_TT,
+  JumpVTS_PTT,
+
+  JumpSS_FP,
+  JumpSS_VMGM_MENU,
+  JumpSS_VTSM,
+  JumpSS_VMGM_PGC,
+
+  CallSS_FP, /* 29 */
+  CallSS_VMGM_MENU,
+  CallSS_VTSM,
+  CallSS_VMGM_PGC,
+
+  PlayThis
+} link_cmd_t;
+
+typedef struct {
+  link_cmd_t command;
+  uint16_t   data1;
+  uint16_t   data2;
+  uint16_t   data3;
+} link_t;
+
+typedef struct {
+  uint16_t SPRM[24];
+  uint16_t GPRM[16];
+  /* Need to have some thing to indicate normal/counter mode for every GPRM */
+  /* int GPRM_mode[16]; */
+} registers_t;
+
+int vmEval_CMD(vm_cmd_t commands[], int num_commands, 
+	       registers_t *registers, link_t *return_values);
+
+void vmPrint_LINK(link_t value);
+
+#endif /* DECODER_H_INCLUDED */