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+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ * \brief FSK Modem Support
+ * \note Includes code and algorithms from the Zapata library.
+ */
+
+#ifndef _ASTERISK_FSKMODEM_H
+#define _ASTERISK_FSKMODEM_H
+
+#define PARITY_NONE 0
+#define PARITY_EVEN 1
+#define PARITY_ODD 2
+
+
+#define NCOLA 0x4000
+
+/* new filter structure */
+struct filter_struct {
+
+ int icoefs[8];
+ int ip;
+ int ixv[8];
+ int iyv[8];
+};
+
+typedef struct {
+ int nbit; /*!< Number of Data Bits (5,7,8) */
+ int parity; /*!< Parity 0=none 1=even 2=odd */
+ int instop; /*!< Number of Stop Bits */
+ int hdlc; /*!< Modo Packet */
+ int xi0;
+ int xi1;
+ int xi2;
+
+ int ispb;
+ int icont;
+ int bw; /*!< Band Selector*/
+ int f_mark_idx; /*!< Mark Frequency Index (f_M-500)/5 */
+ int f_space_idx; /*!< Space Frequency Index (f_S-500)/5 */
+ int state;
+
+ int pllispb; /*!<Pll autosense */
+ int pllids;
+ int pllispb2;
+
+ struct filter_struct mark_filter;
+ struct filter_struct space_filter;
+ struct filter_struct demod_filter;
+
+} fsk_data;
+
+/* \brief Retrieve a serial byte into outbyte.
+ Buffer is a pointer into a series of
+ shorts and len records the number of bytes in the buffer. len will be
+ overwritten with the number of bytes left that were not consumed.
+ \return return value is as follows:
+ \arg 0: Still looking for something...
+ \arg 1: An output byte was received and stored in outbyte
+ \arg -1: An error occured in the transmission
+ This must be called with at least 80 bytes of buffer. */
+int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte);
+int fskmodem_init(fsk_data *fskd);
+
+#endif /* _ASTERISK_FSKMODEM_H */