--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/private/fsk.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,100 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * private/fsk.h - FSK modem transmit and receive parts
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * 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 program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: fsk.h,v 1.5 2009/04/01 13:22:40 steveu Exp $
+ */
+
+#if !defined(_SPANDSP_PRIVATE_FSK_H_)
+#define _SPANDSP_PRIVATE_FSK_H_
+
+/*!
+    FSK modem transmit descriptor. This defines the state of a single working
+    instance of an FSK modem transmitter.
+*/
+struct fsk_tx_state_s
+{
+    int baud_rate;
+    /*! \brief The callback function used to get the next bit to be transmitted. */
+    get_bit_func_t get_bit;
+    /*! \brief A user specified opaque pointer passed to the get_bit function. */
+    void *get_bit_user_data;
+
+    /*! \brief The callback function used to report modem status changes. */
+    modem_tx_status_func_t status_handler;
+    /*! \brief A user specified opaque pointer passed to the status function. */
+    void *status_user_data;
+
+    int32_t phase_rates[2];
+    int16_t scaling;
+    int32_t current_phase_rate;
+    uint32_t phase_acc;
+    int baud_frac;
+    int shutdown;
+};
+
+/*!
+    FSK modem receive descriptor. This defines the state of a single working
+    instance of an FSK modem receiver.
+*/
+struct fsk_rx_state_s
+{
+    int baud_rate;
+    /*! \brief Synchronous/asynchronous framing control */
+    int framing_mode;
+    /*! \brief The callback function used to put each bit received. */
+    put_bit_func_t put_bit;
+    /*! \brief A user specified opaque pointer passed to the put_bit routine. */
+    void *put_bit_user_data;
+
+    /*! \brief The callback function used to report modem status changes. */
+    modem_tx_status_func_t status_handler;
+    /*! \brief A user specified opaque pointer passed to the status function. */
+    void *status_user_data;
+
+    int32_t carrier_on_power;
+    int32_t carrier_off_power;
+    power_meter_t power;
+    /*! \brief The value of the last signal sample, using the a simple HPF for signal power estimation. */
+    int16_t last_sample;
+    /*! \brief >0 if a signal above the minimum is present. It may or may not be a V.29 signal. */
+    int signal_present;
+
+    int32_t phase_rate[2];
+    uint32_t phase_acc[2];
+
+    int correlation_span;
+
+    complexi32_t window[2][FSK_MAX_WINDOW_LEN];
+    complexi32_t dot[2];
+    int buf_ptr;
+
+    int frame_state;
+    int frame_bits;
+    int baud_phase;
+    int last_bit;
+    int scaling_shift;
+};
+
+#endif
+/*- End of file ------------------------------------------------------------*/