106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/modem_connect_tones.c - Generation and detection of tones
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* associated with modems calling and
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* answering calls.
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2006 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: modem_connect_tones.h,v 1.3 2009/11/02 13:25:20 steveu Exp $
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*/
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/*! \file */
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#if !defined(_SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_)
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#define _SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_
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/*!
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Modem connect tones generator descriptor. This defines the state
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of a single working instance of the tone generator.
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*/
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struct modem_connect_tones_tx_state_s
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{
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int tone_type;
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int32_t tone_phase_rate;
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uint32_t tone_phase;
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int16_t level;
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/*! \brief Countdown to the next phase hop */
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int hop_timer;
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/*! \brief Maximum duration timer */
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int duration_timer;
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uint32_t mod_phase;
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int32_t mod_phase_rate;
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int16_t mod_level;
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};
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/*!
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Modem connect tones receiver descriptor. This defines the state
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of a single working instance of the tone detector.
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*/
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struct modem_connect_tones_rx_state_s
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{
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/*! \brief The tone type being detected. */
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int tone_type;
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/*! \brief Callback routine, using to report detection of the tone. */
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tone_report_func_t tone_callback;
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/*! \brief An opaque pointer passed to tone_callback. */
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void *callback_data;
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/*! \brief The notch filter state. */
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float znotch_1;
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float znotch_2;
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/*! \brief The 15Hz AM filter state. */
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float z15hz_1;
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float z15hz_2;
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/*! \brief The in notch power estimate */
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int32_t notch_level;
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/*! \brief The total channel power estimate */
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int32_t channel_level;
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/*! \brief The 15Hz AM power estimate */
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int32_t am_level;
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/*! \brief Sample counter for the small chunks of samples, after which a test is conducted. */
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int chunk_remainder;
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/*! \brief TRUE is the tone is currently confirmed present in the audio. */
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int tone_present;
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/*! \brief */
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int tone_on;
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/*! \brief A millisecond counter, to time the duration of tone sections. */
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int tone_cycle_duration;
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/*! \brief A count of the number of good cycles of tone reversal seen. */
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int good_cycles;
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/*! \brief TRUE if the tone has been seen since the last time the user tested for it */
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int hit;
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/*! \brief A V.21 FSK modem context used when searching for FAX preamble. */
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fsk_rx_state_t v21rx;
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/*! \brief The raw (stuffed) bit stream buffer. */
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unsigned int raw_bit_stream;
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/*! \brief The current number of bits in the octet in progress. */
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int num_bits;
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/*! \brief Number of consecutive flags seen so far. */
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int flags_seen;
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/*! \brief TRUE if framing OK has been announced. */
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int framing_ok_announced;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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