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diff --git a/lib/libdvben50221/en50221_stdcam.h b/lib/libdvben50221/en50221_stdcam.h
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+/*
+	en50221 encoder An implementation for libdvb
+	an implementation for the en50221 transport layer
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as
+	published by the Free Software Foundation; either version 2.1 of
+	the License, or (at your option) any later version.
+
+	This program 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 Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public
+	License along with this library; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+*/
+
+#ifndef EN50221_STDCAM_H
+#define EN50221_STDCAM_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libdvben50221/en50221_app_ai.h>
+#include <libdvben50221/en50221_app_ca.h>
+#include <libdvben50221/en50221_app_mmi.h>
+#include <libdvben50221/en50221_session.h>
+#include <libdvben50221/en50221_transport.h>
+
+enum en50221_stdcam_status {
+	EN50221_STDCAM_CAM_NONE,
+	EN50221_STDCAM_CAM_INRESET,
+	EN50221_STDCAM_CAM_OK,
+	EN50221_STDCAM_CAM_BAD,
+};
+
+struct en50221_stdcam {
+	/* one of more of the following may be NULL if a CAM does not support it */
+	struct en50221_app_ai *ai_resource;
+	struct en50221_app_ca *ca_resource;
+	struct en50221_app_mmi *mmi_resource;
+
+	/* if any of these are -1, no connection is in place to this resource yet */
+	int ai_session_number;
+	int ca_session_number;
+	int mmi_session_number;
+
+	/* poll the stdcam instance */
+	enum en50221_stdcam_status (*poll)(struct en50221_stdcam *stdcam);
+
+	/* inform the stdcam of the current DVB time */
+	void (*dvbtime)(struct en50221_stdcam *stdcam, time_t dvbtime);
+
+	/* destroy the stdcam instance */
+	void (*destroy)(struct en50221_stdcam *stdcam, int closefd);
+};
+
+/**
+ * Create an instance of the STDCAM for an LLCI interface.
+ *
+ * @param cafd FD of the CA device.
+ * @param slotnum Slotnum on that CA device.
+ * @param tl Transport layer instance to use.
+ * @param sl Session layer instance to use.
+ * @return en50221_stdcam instance, or NULL on error.
+ */
+extern struct en50221_stdcam *en50221_stdcam_llci_create(int cafd, int slotnum,
+						  struct en50221_transport_layer *tl,
+						  struct en50221_session_layer *sl);
+
+/**
+ * Create an instance of the STDCAM for an HLCI interface.
+ *
+ * @param cafd FD of the CA device.
+ * @param slotnum Slotnum on that CA device.
+ * @return en50221_stdcam instance, or NULL on error.
+ */
+extern struct en50221_stdcam *en50221_stdcam_hlci_create(int cafd, int slotnum);
+
+/**
+ * Convenience method to create a STDCAM interface for a ca device on a particular adapter.
+ *
+ * @param adapter The DVB adapter concerned.
+ * @param slotnum The ca slot number on that adapter.
+ * @param tl Transport layer instance to use (unused for HLCI cams).
+ * @param sl Session layer instance to use (unused for HLCI cams).
+ * @return en50221_stdcam instance, or NULL on error.
+ */
+extern struct en50221_stdcam *en50221_stdcam_create(int adapter, int slotnum,
+						    struct en50221_transport_layer *tl,
+						    struct en50221_session_layer *sl);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif