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annotate spandsp-0.0.6pre17/src/spandsp/super_tone_rx.h @ 4:26cd8f1ef0b1

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import spandsp-0.0.6pre17
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 15:50:58 +0200
parents
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26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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1 /*
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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2 * SpanDSP - a series of DSP components for telephony
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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3 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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4 * super_tone_rx.h - Flexible telephony supervisory tone detection.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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5 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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6 * Written by Steve Underwood <steveu@coppice.org>
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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7 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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8 * Copyright (C) 2003 Steve Underwood
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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9 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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10 * All rights reserved.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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11 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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12 * This program is free software; you can redistribute it and/or modify
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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13 * it under the terms of the GNU Lesser General Public License version 2.1,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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14 * as published by the Free Software Foundation.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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15 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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16 * This program is distributed in the hope that it will be useful,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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19 * GNU Lesser General Public License for more details.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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20 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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21 * You should have received a copy of the GNU Lesser General Public
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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22 * License along with this program; if not, write to the Free Software
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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24 *
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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25 * $Id: super_tone_rx.h,v 1.21 2009/02/10 13:06:47 steveu Exp $
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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26 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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27
26cd8f1ef0b1 import spandsp-0.0.6pre17
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28 #if !defined(_SPANDSP_SUPER_TONE_RX_H_)
26cd8f1ef0b1 import spandsp-0.0.6pre17
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29 #define _SPANDSP_SUPER_TONE_RX_H_
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30
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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31 /*! \page super_tone_rx_page Supervisory tone detection
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32
26cd8f1ef0b1 import spandsp-0.0.6pre17
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33 \section super_tone_rx_page_sec_1 What does it do?
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34
26cd8f1ef0b1 import spandsp-0.0.6pre17
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35 The supervisory tone detector may be configured to detect most of the world's
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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36 telephone supervisory tones - things like ringback, busy, number unobtainable,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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37 and so on.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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38
26cd8f1ef0b1 import spandsp-0.0.6pre17
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39 \section super_tone_rx_page_sec_2 How does it work?
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40
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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41 The supervisory tone detector is passed a series of data structures describing
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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42 the tone patterns - the frequencies and cadencing - of the tones to be searched
26cd8f1ef0b1 import spandsp-0.0.6pre17
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43 for. It constructs one or more Goertzel filters to monitor the required tones.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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44 If tones are close in frequency a single Goertzel set to the centre of the
26cd8f1ef0b1 import spandsp-0.0.6pre17
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45 frequency range will be used. This optimises the efficiency of the detector. The
26cd8f1ef0b1 import spandsp-0.0.6pre17
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46 Goertzel filters are applied without applying any special window functional
26cd8f1ef0b1 import spandsp-0.0.6pre17
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47 (i.e. they use a rectangular window), so they have a sinc like response.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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48 However, for most tone patterns their rejection qualities are adequate.
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49
26cd8f1ef0b1 import spandsp-0.0.6pre17
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50 The detector aims to meet the need of the standard call progress tones, to
26cd8f1ef0b1 import spandsp-0.0.6pre17
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51 ITU-T E.180/Q.35 (busy, dial, ringback, reorder). Also, the extended tones,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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52 to ITU-T E.180, Supplement 2 and EIA/TIA-464-A (recall dial tone, special
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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53 ringback tone, intercept tone, call waiting tone, busy verification tone,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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54 executive override tone, confirmation tone).
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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55 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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56
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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57 /*! Tone detection indication callback routine */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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58 typedef void (*tone_report_func_t)(void *user_data, int code, int level, int delay);
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59
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60 typedef struct super_tone_rx_segment_s super_tone_rx_segment_t;
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61
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62 typedef struct super_tone_rx_descriptor_s super_tone_rx_descriptor_t;
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63
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64 typedef struct super_tone_rx_state_s super_tone_rx_state_t;
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65
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66 #if defined(__cplusplus)
26cd8f1ef0b1 import spandsp-0.0.6pre17
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67 extern "C"
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68 {
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69 #endif
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70
26cd8f1ef0b1 import spandsp-0.0.6pre17
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71 /*! Create a new supervisory tone detector descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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72 \param desc The supervisory tone set desciptor. If NULL, the routine will allocate space for a
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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73 descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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74 \return The supervisory tone set descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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75 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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76 SPAN_DECLARE(super_tone_rx_descriptor_t *) super_tone_rx_make_descriptor(super_tone_rx_descriptor_t *desc);
26cd8f1ef0b1 import spandsp-0.0.6pre17
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77
26cd8f1ef0b1 import spandsp-0.0.6pre17
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78 /*! Free a supervisory tone detector descriptor.
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79 \param desc The supervisory tone set desciptor.
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80 \return 0 for OK, -1 for fail.
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81 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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82 SPAN_DECLARE(int) super_tone_rx_free_descriptor(super_tone_rx_descriptor_t *desc);
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83
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84 /*! Add a new tone pattern to a supervisory tone detector set.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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85 \param desc The supervisory tone set descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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86 \return The new tone ID. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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87 SPAN_DECLARE(int) super_tone_rx_add_tone(super_tone_rx_descriptor_t *desc);
26cd8f1ef0b1 import spandsp-0.0.6pre17
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88
26cd8f1ef0b1 import spandsp-0.0.6pre17
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89 /*! Add a new tone pattern element to a tone pattern in a supervisory tone detector.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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90 \param desc The supervisory tone set desciptor.
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91 \param tone The tone ID within the descriptor.
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92 \param f1 Frequency 1 (-1 for a silent period).
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93 \param f2 Frequency 2 (-1 for a silent period, or only one frequency).
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94 \param min The minimum duration, in ms.
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95 \param max The maximum duration, in ms.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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96 \return The new number of elements in the tone description.
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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97 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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98 SPAN_DECLARE(int) super_tone_rx_add_element(super_tone_rx_descriptor_t *desc,
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99 int tone,
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100 int f1,
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101 int f2,
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102 int min,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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103 int max);
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104
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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105 /*! Initialise a supervisory tone detector.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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parents:
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106 \param s The supervisory tone detector context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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107 \param desc The tone descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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108 \param callback The callback routine called to report the valid detection or termination of
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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109 one of the monitored tones.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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110 \param user_data An opaque pointer passed when calling the callback routine.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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111 \return The supervisory tone detector context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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112 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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113 SPAN_DECLARE(super_tone_rx_state_t *) super_tone_rx_init(super_tone_rx_state_t *s,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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114 super_tone_rx_descriptor_t *desc,
26cd8f1ef0b1 import spandsp-0.0.6pre17
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115 tone_report_func_t callback,
26cd8f1ef0b1 import spandsp-0.0.6pre17
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116 void *user_data);
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117
26cd8f1ef0b1 import spandsp-0.0.6pre17
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118 /*! Release a supervisory tone detector.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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119 \param s The supervisory tone context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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120 \return 0 for OK, -1 for fail.
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121 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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122 SPAN_DECLARE(int) super_tone_rx_release(super_tone_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
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123
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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124 /*! Free a supervisory tone detector.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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125 \param s The supervisory tone context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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126 \return 0 for OK, -1 for fail.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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127 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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128 SPAN_DECLARE(int) super_tone_rx_free(super_tone_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
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129
26cd8f1ef0b1 import spandsp-0.0.6pre17
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130 /*! Define a callback routine to be called each time a tone pattern element is complete. This is
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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131 mostly used when analysing a tone.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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132 \param s The supervisory tone context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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133 \param callback The callback routine.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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134 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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135 SPAN_DECLARE(void) super_tone_rx_segment_callback(super_tone_rx_state_t *s,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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136 void (*callback)(void *data, int f1, int f2, int duration));
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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137
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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138 /*! Apply supervisory tone detection processing to a block of audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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139 \brief Apply supervisory tone detection processing to a block of audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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140 \param super The supervisory tone context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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141 \param amp The audio sample buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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142 \param samples The number of samples in the buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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143 \return The number of samples processed.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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144 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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145 SPAN_DECLARE(int) super_tone_rx(super_tone_rx_state_t *super, const int16_t amp[], int samples);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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146
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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147 #if defined(__cplusplus)
26cd8f1ef0b1 import spandsp-0.0.6pre17
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148 }
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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149 #endif
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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150
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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151 #endif
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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152 /*- End of file ------------------------------------------------------------*/

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