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diff --git a/src/xine-engine/nvtv/backend.h b/src/xine-engine/nvtv/backend.h
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+++ b/src/xine-engine/nvtv/backend.h
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+/* NVTV backend (header) -- Dirk Thierbach <dthierbach@gmx.de>
+ *
+ * This file is part of nvtv, a tool for tv-output on NVidia cards.
+ * 
+ * nvtv 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.
+ * 
+ * nvtv 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: backend.h,v 1.1 2003/01/18 15:29:22 miguelfreitas Exp $
+ *
+ * Contents:
+ *
+ * Common header for all backends
+ */
+
+#ifndef _BACKEND_H
+#define _BACKEND_H
+
+#include "debug.h"
+#include "tv_chip.h"
+
+#ifdef DEBUG_PROBE
+#include "tv_common.h"
+#endif
+
+#include "local.h" /* for Bool, after xfree.h */
+
+/* WARNING! The first entry of the two following data structures MUST be
+   the 'next' field, and the second entry MUST be a string. If they are not,
+   the pipe routines will crash. Other pointers besides those two are
+   transfered through the pipe, but should be ignored, as there value is 
+   invalid. */
+
+/* List of chips accessible on one card. Most of the time, there will
+   be only one tv chip, though in theory one could use two on dual-head
+   cards. Other chips can be stored here as well. We duplicate the
+   information in I2Chain and I2CDev to make the frontend independent
+   of the back end. 
+*/
+
+typedef struct chip_info {
+  struct chip_info *next; /* must be 1st entry! */
+  char *name;    /* must be 2nd entry! (name including version and I2C addr) */
+  TVChip chip;   /* chip type */
+  int bus, addr; /* I2C bus and address */
+  void *private; /* identify device, backend private */
+} ChipInfo, *ChipPtr;
+
+/* List of all NVidia cards available */
+
+typedef struct card_info {
+  struct card_info *next; /* must be 1st entry! */
+  char *name; /* must be 2nd entry! (name including bus addr) */
+  char *dev;  /* name of device for mmap (not via pipe) */
+  char *arch; /* architecture (not via pipe) */
+  CardType type;
+  unsigned long reg_base;
+  unsigned long pio_base;
+  int addr_bus, addr_slot, addr_func;
+  int pci_id;
+  ChipPtr chips;  
+} CardInfo, *CardPtr;
+
+#define BACK_SERVICE_CURSOR		(1 << 0)
+#define BACK_SERVICE_VIDEO		(1 << 1)
+#define BACK_SERVICE_VIEW_CURSOR	(1 << 2)
+#define BACK_SERVICE_VIEW_MAIN		(1 << 3)
+
+typedef struct {
+  void (*openCard) (CardPtr card);
+  void (*closeCard) (void);
+#ifdef DEBUG_PROBE
+  void (*probeSystem) (CardPtr card_list);
+#endif
+} BackAccessRec, *BackAccessPtr;
+
+typedef struct {
+  void (*openCard) (CardPtr card);
+  void (*closeCard) (void);
+  void (*probeChips) (void);
+#ifdef DEBUG_PROBE
+  void (*probeCard) (void);
+  I2CChainPtr (*probeBus) (void);
+#endif
+  void (*setHeads) (int main, int tv, int video);
+  void (*getHeads) (int *main, int *tv, int *video, int *max);
+  void (*getHeadDev) (int head, int *devFlags);
+  void (*setChip) (ChipPtr chip, Bool init);
+  void (*setSettings) (TVSettings *set);
+  void (*getSettings) (TVSettings *set);
+  void (*setMode) (TVRegs *r);
+  void (*getMode) (TVRegs *r);
+  void (*setModeSettings) (TVRegs *r, TVSettings *set);
+  void (*setTestImage) (TVEncoderRegs *tv, TVSettings *set);
+  long (*getStatus) (int index);
+  TVConnect (*getConnection) (void);
+  Bool (*findBySize) (TVSystem system, int xres, int yres, char *size, 
+    TVMode *mode);
+  Bool (*findByOverscan) (TVSystem system, int xres, int yres, 
+    double hoc, double voc, TVMode *mode);
+  void (*initSharedView) (int *view_x, int *view_y);
+  Bool (*getTwinView) (int *view_x, int *view_y);
+  Bool (*adjustViewport) (int flags, int *view_x, int *view_y);
+  Bool (*serviceViewportCursor) (int flags, int cursor_x, int cursor_y, 
+    int *view_x, int *view_y);
+} BackCardRec, *BackCardPtr;
+
+/* The backend(s) use static information, so there can only be one
+   backend active: */
+
+extern BackAccessPtr back_access;
+extern BackCardPtr back_card;
+
+#endif /* _BACKEND_H */