--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/private/v17tx.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,111 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * private/v17tx.h - ITU V.17 modem transmit part
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2004 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: v17tx.h,v 1.2.4.1 2009/12/24 16:52:30 steveu Exp $
+ */
+
+/*! \file */
+
+#if !defined(_SPANDSP_PRIVATE_V17TX_H_)
+#define _SPANDSP_PRIVATE_V17TX_H_
+
+/*! The number of taps in the pulse shaping/bandpass filter */
+#define V17_TX_FILTER_STEPS     9
+
+/*!
+    V.17 modem transmit side descriptor. This defines the working state for a
+    single instance of a V.17 modem transmitter.
+*/
+struct v17_tx_state_s
+{
+    /*! \brief The bit rate of the modem. Valid values are 4800, 7200 and 9600. */
+    int bit_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;
+
+    /*! \brief The gain factor needed to achieve the specified output power. */
+#if defined(SPANDSP_USE_FIXED_POINT)
+    int32_t gain;
+#else
+    float gain;
+#endif
+
+    /*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */
+#if defined(SPANDSP_USE_FIXED_POINT)
+    complexi16_t rrc_filter[2*V17_TX_FILTER_STEPS];
+#else
+    complexf_t rrc_filter[2*V17_TX_FILTER_STEPS];
+#endif
+    /*! \brief Current offset into the RRC pulse shaping filter buffer. */
+    int rrc_filter_step;
+
+    /*! \brief The current state of the differential encoder. */
+    int diff;
+    /*! \brief The current state of the convolutional encoder. */
+    int convolution;
+    /*! \brief The code number for the current position in the constellation. */
+    int constellation_state;
+
+    /*! \brief The register for the data scrambler. */
+    uint32_t scramble_reg;
+    /*! \brief Scrambler tap */
+    //int scrambler_tap;
+    /*! \brief TRUE if transmitting the training sequence. FALSE if transmitting user data. */
+    int in_training;
+    /*! \brief TRUE if the short training sequence is to be used. */
+    int short_train;
+    /*! \brief A counter used to track progress through sending the training sequence. */
+    int training_step;
+
+    /*! \brief The current phase of the carrier (i.e. the DDS parameter). */
+    uint32_t carrier_phase;
+    /*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
+    int32_t carrier_phase_rate;
+    /*! \brief The current fractional phase of the baud timing. */
+    int baud_phase;
+    
+    /*! \brief A pointer to the constellation currently in use. */
+#if defined(SPANDSP_USE_FIXED_POINT)
+    const complexi16_t *constellation;
+#else
+    const complexf_t *constellation;
+#endif
+    /*! \brief The current number of data bits per symbol. This does not include
+               the redundant bit. */
+    int bits_per_symbol;
+    /*! \brief The get_bit function in use at any instant. */
+    get_bit_func_t current_get_bit;
+    /*! \brief Error and flow logging control */
+    logging_state_t logging;
+};
+
+#endif
+/*- End of file ------------------------------------------------------------*/