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annotate spandsp-0.0.6pre17/src/spandsp/bell_r2_mf.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 * bell_r2_mf.h - Bell MF and MFC/R2 tone generation and detection.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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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) 2001 Steve Underwood
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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
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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>
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19 * GNU Lesser General Public License for more details.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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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
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22 * License along with this program; if not, write to the Free Software
26cd8f1ef0b1 import spandsp-0.0.6pre17
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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25 * $Id: bell_r2_mf.h,v 1.24 2009/02/10 13:06:47 steveu Exp $
26cd8f1ef0b1 import spandsp-0.0.6pre17
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26 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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27
26cd8f1ef0b1 import spandsp-0.0.6pre17
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28 /*! \file */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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29
26cd8f1ef0b1 import spandsp-0.0.6pre17
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30 #if !defined(_SPANDSP_BELL_R2_MF_H_)
26cd8f1ef0b1 import spandsp-0.0.6pre17
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31 #define _SPANDSP_BELL_R2_MF_H_
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32
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33 /*! \page mfc_r2_tone_generation_page MFC/R2 tone generation
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34 \section mfc_r2_tone_generation_page_sec_1 What does it do?
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35 The MFC/R2 tone generation module provides for the generation of the
26cd8f1ef0b1 import spandsp-0.0.6pre17
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36 repertoire of 15 dual tones needs for the digital MFC/R2 signalling protocol.
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37
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38 \section mfc_r2_tone_generation_page_sec_2 How does it work?
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39 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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40
26cd8f1ef0b1 import spandsp-0.0.6pre17
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41 /*! \page bell_mf_tone_generation_page Bell MF tone generation
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42 \section bell_mf_tone_generation_page_sec_1 What does it do?
26cd8f1ef0b1 import spandsp-0.0.6pre17
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43 The Bell MF tone generation module provides for the generation of the
26cd8f1ef0b1 import spandsp-0.0.6pre17
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44 repertoire of 15 dual tones needs for various Bell MF signalling protocols.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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45
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46 \section bell_mf_tone_generation_page_sec_2 How does it work?
26cd8f1ef0b1 import spandsp-0.0.6pre17
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47 Basic Bell MF tone generation specs:
26cd8f1ef0b1 import spandsp-0.0.6pre17
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48 - Tone on time = KP: 100+-7ms. All other signals: 68+-7ms
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49 - Tone off time (between digits) = 68+-7ms
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50 - Frequency tolerance +- 1.5%
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51 - Signal level -7+-1dBm per frequency
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52 */
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53
26cd8f1ef0b1 import spandsp-0.0.6pre17
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54 /*! \page mfc_r2_tone_rx_page MFC/R2 tone receiver
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55
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56 \section mfc_r2_tone_rx_page_sec_1 What does it do?
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57 The MFC/R2 tone receiver module provides for the detection of the
26cd8f1ef0b1 import spandsp-0.0.6pre17
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58 repertoire of 15 dual tones needs for the digital MFC/R2 signalling protocol.
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59 It is compliant with ITU-T Q.441D.
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60
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61 \section mfc_r2_tone_rx_page_sec_2 How does it work?
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62 Basic MFC/R2 tone detection specs:
26cd8f1ef0b1 import spandsp-0.0.6pre17
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63 - Receiver response range: -5dBm to -35dBm
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64 - Difference in level for a pair of frequencies
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65 - Adjacent tones: <5dB
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66 - Non-adjacent tones: <7dB
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67 - Receiver not to detect a signal of 2 frequencies of level -5dB and
26cd8f1ef0b1 import spandsp-0.0.6pre17
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68 duration <7ms.
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69 - Receiver not to recognise a signal of 2 frequencies having a difference
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70 in level >=20dB.
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71 - Max received signal frequency error: +-10Hz
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72 - The sum of the operate and release times of a 2 frequency signal not to
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73 exceed 80ms (there are no individual specs for the operate and release
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74 times).
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75 - Receiver not to release for signal interruptions <=7ms.
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76 - System malfunction due to signal interruptions >7ms (typically 20ms) is
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77 prevented by further logic elements.
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78 */
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79
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80 /*! \page bell_mf_tone_rx_page Bell MF tone receiver
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81
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82 \section bell_mf_tone_rx_page_sec_1 What does it do?
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83 The Bell MF tone receiver module provides for the detection of the
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84 repertoire of 15 dual tones needs for various Bell MF signalling protocols.
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85 It is compliant with ITU-T Q.320, ITU-T Q.322, ITU-T Q.323B.
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86
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87 \section bell_mf_tone_rx_page_sec_2 How does it work?
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88 Basic Bell MF tone detection specs:
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89 - Frequency tolerance +- 1.5% +-10Hz
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90 - Signal level -14dBm to 0dBm
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91 - Perform a "two and only two tones present" test.
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92 - Twist <= 6dB accepted
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93 - Receiver sensitive to signals above -22dBm per frequency
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94 - Test for a minimum of 55ms if KP, or 30ms of other signals.
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95 - Signals to be recognised if the two tones arrive within 8ms of each other.
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96 - Invalid signals result in the return of the re-order tone.
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97
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98 Note: Above -3dBm the signal starts to clip. We can detect with a little clipping,
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99 but not up to 0dBm, which the above spec seems to require. There isn't a lot
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100 we can do about that. Is the spec. incorrectly worded about the dBm0 reference
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101 point, or have I misunderstood it?
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102 */
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103
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104 /*! The maximum number of Bell MF digits we can buffer. */
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105 #define MAX_BELL_MF_DIGITS 128
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106
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107 /*!
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108 Bell MF generator state descriptor. This defines the state of a single
26cd8f1ef0b1 import spandsp-0.0.6pre17
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109 working instance of a Bell MF generator.
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110 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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111 typedef struct bell_mf_tx_state_s bell_mf_tx_state_t;
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112
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113 /*!
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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114 Bell MF digit detector descriptor.
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115 */
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116 typedef struct bell_mf_rx_state_s bell_mf_rx_state_t;
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117
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118 /*!
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119 MFC/R2 tone detector descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
120 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
121 typedef struct r2_mf_tx_state_s r2_mf_tx_state_t;
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
122
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
123 /*!
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
124 MFC/R2 tone detector descriptor.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
125 */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
126 typedef struct r2_mf_rx_state_s r2_mf_rx_state_t;
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
127
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
128 #if defined(__cplusplus)
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
129 extern "C"
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
130 {
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
131 #endif
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
132
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
133 /*! \brief Generate a buffer of Bell MF tones.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
134 \param s The Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
135 \param amp The buffer for the generated signal.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
136 \param max_samples The required number of generated samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
137 \return The number of samples actually generated. This may be less than
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
138 max_samples if the input buffer empties. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
139 SPAN_DECLARE(int) bell_mf_tx(bell_mf_tx_state_t *s, int16_t amp[], int max_samples);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
140
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
141 /*! \brief Put a string of digits in a Bell MF generator's input buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
142 \param s The Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
143 \param digits The string of digits to be added.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
144 \param len The length of the string of digits. If negative, the string is
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
145 assumed to be a NULL terminated string.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
146 \return The number of digits actually added. This may be less than the
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
147 length of the digit string, if the buffer fills up. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
148 SPAN_DECLARE(int) bell_mf_tx_put(bell_mf_tx_state_t *s, const char *digits, int len);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
149
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
150 /*! \brief Initialise a Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
151 \param s The Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
152 \return A pointer to the Bell MF generator context.*/
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
153 SPAN_DECLARE(bell_mf_tx_state_t *) bell_mf_tx_init(bell_mf_tx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
154
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
155 /*! \brief Release a Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
156 \param s The Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
157 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
158 SPAN_DECLARE(int) bell_mf_tx_release(bell_mf_tx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
159
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
160 /*! \brief Free a Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
161 \param s The Bell MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
162 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
163 SPAN_DECLARE(int) bell_mf_tx_free(bell_mf_tx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
164
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
165 /*! \brief Generate a block of R2 MF tones.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
166 \param s The R2 MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
167 \param amp The buffer for the generated signal.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
168 \param samples The required number of generated samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
169 \return The number of samples actually generated. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
170 SPAN_DECLARE(int) r2_mf_tx(r2_mf_tx_state_t *s, int16_t amp[], int samples);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
171
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
172 /*! \brief Generate a block of R2 MF tones.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
173 \param s The R2 MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
174 \param digit The digit to be generated.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
175 \return 0 for OK, or -1 for a bad request. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
176 SPAN_DECLARE(int) r2_mf_tx_put(r2_mf_tx_state_t *s, char digit);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
177
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
178 /*! \brief Initialise an R2 MF tone generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
179 \param s The R2 MF generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
180 \param fwd TRUE if the context is for forward signals. FALSE if the
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
181 context is for backward signals.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
182 \return A pointer to the MFC/R2 generator context.*/
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
183 SPAN_DECLARE(r2_mf_tx_state_t *) r2_mf_tx_init(r2_mf_tx_state_t *s, int fwd);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
184
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
185 /*! \brief Release an R2 MF tone generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
186 \param s The R2 MF tone generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
187 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
188 SPAN_DECLARE(int) r2_mf_tx_release(r2_mf_tx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
189
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
190 /*! \brief Free an R2 MF tone generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
191 \param s The R2 MF tone generator context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
192 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
193 SPAN_DECLARE(int) r2_mf_tx_free(r2_mf_tx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
194
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
195 /*! Process a block of received Bell MF audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
196 \brief Process a block of received Bell MF audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
197 \param s The Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
198 \param amp The audio sample buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
199 \param samples The number of samples in the buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
200 \return The number of samples unprocessed. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
201 SPAN_DECLARE(int) bell_mf_rx(bell_mf_rx_state_t *s, const int16_t amp[], int samples);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
202
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
203 /*! \brief Get a string of digits from a Bell MF receiver's output buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
204 \param s The Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
205 \param buf The buffer for the received digits.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
206 \param max The maximum number of digits to be returned,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
207 \return The number of digits actually returned. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
208 SPAN_DECLARE(size_t) bell_mf_rx_get(bell_mf_rx_state_t *s, char *buf, int max);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
209
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
210 /*! \brief Initialise a Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
211 \param s The Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
212 \param callback An optional callback routine, used to report received digits. If
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
213 no callback routine is set, digits may be collected, using the bell_mf_rx_get()
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
214 function.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
215 \param user_data An opaque pointer which is associated with the context,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
216 and supplied in callbacks.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
217 \return A pointer to the Bell MF receiver context.*/
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
218 SPAN_DECLARE(bell_mf_rx_state_t *) bell_mf_rx_init(bell_mf_rx_state_t *s,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
219 digits_rx_callback_t callback,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
220 void *user_data);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
221
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
222 /*! \brief Release a Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
223 \param s The Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
224 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
225 SPAN_DECLARE(int) bell_mf_rx_release(bell_mf_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
226
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
227 /*! \brief Free a Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
228 \param s The Bell MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
229 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
230 SPAN_DECLARE(int) bell_mf_rx_free(bell_mf_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
231
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
232 /*! Process a block of received R2 MF audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
233 \brief Process a block of received R2 MF audio samples.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
234 \param s The R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
235 \param amp The audio sample buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
236 \param samples The number of samples in the buffer.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
237 \return The number of samples unprocessed. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
diff changeset
238 SPAN_DECLARE(int) r2_mf_rx(r2_mf_rx_state_t *s, const int16_t amp[], int samples);
26cd8f1ef0b1 import spandsp-0.0.6pre17
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239
26cd8f1ef0b1 import spandsp-0.0.6pre17
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240 /*! \brief Get the current digit from an R2 MF receiver.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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241 \param s The R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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242 \return The number digits being received. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
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243 SPAN_DECLARE(int) r2_mf_rx_get(r2_mf_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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244
26cd8f1ef0b1 import spandsp-0.0.6pre17
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245 /*! \brief Initialise an R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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246 \param s The R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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247 \param fwd TRUE if the context is for forward signals. FALSE if the
26cd8f1ef0b1 import spandsp-0.0.6pre17
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248 context is for backward signals.
26cd8f1ef0b1 import spandsp-0.0.6pre17
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249 \param callback An optional callback routine, used to report received digits. If
26cd8f1ef0b1 import spandsp-0.0.6pre17
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250 no callback routine is set, digits may be collected, using the r2_mf_rx_get()
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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251 function.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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252 \param user_data An opaque pointer which is associated with the context,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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253 and supplied in callbacks.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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254 \return A pointer to the R2 MF receiver context. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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255 SPAN_DECLARE(r2_mf_rx_state_t *) r2_mf_rx_init(r2_mf_rx_state_t *s,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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256 int fwd,
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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257 tone_report_func_t callback,
26cd8f1ef0b1 import spandsp-0.0.6pre17
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258 void *user_data);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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259
26cd8f1ef0b1 import spandsp-0.0.6pre17
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260 /*! \brief Release an R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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261 \param s The R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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262 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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263 SPAN_DECLARE(int) r2_mf_rx_release(r2_mf_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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264
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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265 /*! \brief Free an R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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266 \param s The R2 MF receiver context.
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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267 \return 0 for OK, else -1. */
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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268 SPAN_DECLARE(int) r2_mf_rx_free(r2_mf_rx_state_t *s);
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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269
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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270 #if defined(__cplusplus)
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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271 }
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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272 #endif
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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273
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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274 #endif
26cd8f1ef0b1 import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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275 /*- End of file ------------------------------------------------------------*/

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