/usr/include/spandsp/private/fsk.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 95 96 97 98 | /*
* 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.
*/
#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 ------------------------------------------------------------*/
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