/usr/include/spandsp/private/v27ter_tx.h is in libspandsp-dev 0.0.6-2+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | /*
* SpanDSP - a series of DSP components for telephony
*
* private/v27ter_tx.h - ITU V.27ter modem transmit part
*
* 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.
*/
#if !defined(_SPANDSP_PRIVATE_V27TER_TX_H_)
#define _SPANDSP_PRIVATE_V27TER_TX_H_
/*! The number of taps in the pulse shaping/bandpass filter */
#define V27TER_TX_FILTER_STEPS 9
/*!
V.27ter modem transmit side descriptor. This defines the working state for a
single instance of a V.27ter modem transmitter.
*/
struct v27ter_tx_state_s
{
/*! \brief The bit rate of the modem. Valid values are 2400 and 4800. */
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_status_func_t status_handler;
/*! \brief A user specified opaque pointer passed to the status function. */
void *status_user_data;
#if defined(SPANDSP_USE_FIXED_POINT)
/*! \brief The gain factor needed to achieve the specified output power at 2400bps. */
int32_t gain_2400;
/*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
int32_t gain_4800;
/*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
complexi16_t rrc_filter[2*V27TER_TX_FILTER_STEPS];
#else
/*! \brief The gain factor needed to achieve the specified output power at 2400bps. */
float gain_2400;
/*! \brief The gain factor needed to achieve the specified output power at 4800bps. */
float gain_4800;
/*! \brief The root raised cosine (RRC) pulse shaping filter buffer. */
complexf_t rrc_filter[2*V27TER_TX_FILTER_STEPS];
#endif
/*! \brief Current offset into the RRC pulse shaping filter buffer. */
int rrc_filter_step;
/*! \brief The register for the training and data scrambler. */
uint32_t scramble_reg;
/*! \brief A counter for the number of consecutive bits of repeating pattern through
the scrambler. */
int scrambler_pattern_count;
/*! \brief TRUE if transmitting the training sequence, or shutting down transmission.
FALSE if transmitting user data. */
int in_training;
/*! \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 The code number for the current position in the constellation. */
int constellation_state;
/*! \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 ------------------------------------------------------------*/
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