Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/private/modem_connect_tones.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * private/modem_connect_tones.c - Generation and detection of tones | |
| 5 * associated with modems calling and | |
| 6 * answering calls. | |
| 7 * | |
| 8 * Written by Steve Underwood <steveu@coppice.org> | |
| 9 * | |
| 10 * Copyright (C) 2006 Steve Underwood | |
| 11 * | |
| 12 * All rights reserved. | |
| 13 * | |
| 14 * This program is free software; you can redistribute it and/or modify | |
| 15 * it under the terms of the GNU Lesser General Public License version 2.1, | |
| 16 * as published by the Free Software Foundation. | |
| 17 * | |
| 18 * This program is distributed in the hope that it will be useful, | |
| 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 21 * GNU Lesser General Public License for more details. | |
| 22 * | |
| 23 * You should have received a copy of the GNU Lesser General Public | |
| 24 * License along with this program; if not, write to the Free Software | |
| 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 26 * | |
| 27 * $Id: modem_connect_tones.h,v 1.3 2009/11/02 13:25:20 steveu Exp $ | |
| 28 */ | |
| 29 | |
| 30 /*! \file */ | |
| 31 | |
| 32 #if !defined(_SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_) | |
| 33 #define _SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_ | |
| 34 | |
| 35 /*! | |
| 36 Modem connect tones generator descriptor. This defines the state | |
| 37 of a single working instance of the tone generator. | |
| 38 */ | |
| 39 struct modem_connect_tones_tx_state_s | |
| 40 { | |
| 41 int tone_type; | |
| 42 | |
| 43 int32_t tone_phase_rate; | |
| 44 uint32_t tone_phase; | |
| 45 int16_t level; | |
| 46 /*! \brief Countdown to the next phase hop */ | |
| 47 int hop_timer; | |
| 48 /*! \brief Maximum duration timer */ | |
| 49 int duration_timer; | |
| 50 uint32_t mod_phase; | |
| 51 int32_t mod_phase_rate; | |
| 52 int16_t mod_level; | |
| 53 }; | |
| 54 | |
| 55 /*! | |
| 56 Modem connect tones receiver descriptor. This defines the state | |
| 57 of a single working instance of the tone detector. | |
| 58 */ | |
| 59 struct modem_connect_tones_rx_state_s | |
| 60 { | |
| 61 /*! \brief The tone type being detected. */ | |
| 62 int tone_type; | |
| 63 /*! \brief Callback routine, using to report detection of the tone. */ | |
| 64 tone_report_func_t tone_callback; | |
| 65 /*! \brief An opaque pointer passed to tone_callback. */ | |
| 66 void *callback_data; | |
| 67 | |
| 68 /*! \brief The notch filter state. */ | |
| 69 float znotch_1; | |
| 70 float znotch_2; | |
| 71 /*! \brief The 15Hz AM filter state. */ | |
| 72 float z15hz_1; | |
| 73 float z15hz_2; | |
| 74 /*! \brief The in notch power estimate */ | |
| 75 int32_t notch_level; | |
| 76 /*! \brief The total channel power estimate */ | |
| 77 int32_t channel_level; | |
| 78 /*! \brief The 15Hz AM power estimate */ | |
| 79 int32_t am_level; | |
| 80 /*! \brief Sample counter for the small chunks of samples, after which a test is conducted. */ | |
| 81 int chunk_remainder; | |
| 82 /*! \brief TRUE is the tone is currently confirmed present in the audio. */ | |
| 83 int tone_present; | |
| 84 /*! \brief */ | |
| 85 int tone_on; | |
| 86 /*! \brief A millisecond counter, to time the duration of tone sections. */ | |
| 87 int tone_cycle_duration; | |
| 88 /*! \brief A count of the number of good cycles of tone reversal seen. */ | |
| 89 int good_cycles; | |
| 90 /*! \brief TRUE if the tone has been seen since the last time the user tested for it */ | |
| 91 int hit; | |
| 92 /*! \brief A V.21 FSK modem context used when searching for FAX preamble. */ | |
| 93 fsk_rx_state_t v21rx; | |
| 94 /*! \brief The raw (stuffed) bit stream buffer. */ | |
| 95 unsigned int raw_bit_stream; | |
| 96 /*! \brief The current number of bits in the octet in progress. */ | |
| 97 int num_bits; | |
| 98 /*! \brief Number of consecutive flags seen so far. */ | |
| 99 int flags_seen; | |
| 100 /*! \brief TRUE if framing OK has been announced. */ | |
| 101 int framing_ok_announced; | |
| 102 }; | |
| 103 | |
| 104 #endif | |
| 105 /*- End of file ------------------------------------------------------------*/ |