1 | //dtmf.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2012 |
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5 | * |
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6 | * This file is part of libroardsp a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroardsp is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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22 | * |
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23 | */ |
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24 | |
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25 | #include "libroardsp.h" |
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26 | |
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27 | ssize_t roar_dtmf_mus2samples(const int_least32_t t, const uint32_t rate) { |
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28 | int64_t ret = t; |
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29 | |
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30 | if ( t < 0 || rate == 0 ) { |
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31 | roar_err_set(ROAR_ERROR_INVAL); |
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32 | return -1; |
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33 | } |
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34 | |
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35 | ret *= (int64_t)rate; |
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36 | ret /= (int64_t)1000000; |
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37 | |
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38 | return ret; |
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39 | } |
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40 | |
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41 | int roar_dtmf_break(int16_t * samples, const size_t len, const uint32_t rate, const int options) { |
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42 | (void)rate, (void)options; |
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43 | |
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44 | ROAR_DBG("roar_dtmf_break(samples=%p, len=%llu, rate=%lu, options=%i) = ?", samples, (long long unsigned int)len, (long unsigned int)rate, options); |
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45 | |
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46 | if ( samples == NULL ) { |
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47 | roar_err_set(ROAR_ERROR_FAULT); |
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48 | return -1; |
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49 | } |
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50 | |
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51 | memset(samples, 0, len*sizeof(int16_t)); |
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52 | |
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53 | return 0; |
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54 | } |
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55 | |
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56 | static const struct tone { |
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57 | const uint16_t c; |
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58 | const float f0; |
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59 | const float f1; |
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60 | } _roardsp_tones[] = { |
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61 | {'1', 697, 1209}, |
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62 | {'2', 697, 1336}, |
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63 | {'3', 697, 1477}, |
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64 | {'A', 697, 1633}, |
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65 | |
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66 | {'4', 770, 1209}, |
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67 | {'5', 770, 1336}, |
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68 | {'6', 770, 1477}, |
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69 | {'B', 770, 1633}, |
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70 | |
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71 | {'7', 852, 1209}, |
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72 | {'8', 852, 1336}, |
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73 | {'9', 852, 1477}, |
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74 | {'C', 852, 1633}, |
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75 | |
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76 | {'*', 941, 1209}, |
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77 | {'0', 941, 1336}, |
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78 | {'#', 941, 1477}, |
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79 | {'D', 941, 1633}, |
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80 | |
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81 | {0, -1, -1} |
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82 | }; |
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83 | |
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84 | static const struct tone * __lookup_tone(const int options, uint16_t c) { |
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85 | size_t i; |
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86 | |
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87 | (void)options; |
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88 | |
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89 | if ( c >= 'a' ) |
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90 | c -= 'a' - 'A'; |
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91 | |
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92 | for (i = 0; _roardsp_tones[i].c != 0; i++) { |
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93 | if ( _roardsp_tones[i].c == c ) { |
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94 | return &(_roardsp_tones[i]); |
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95 | } |
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96 | } |
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97 | |
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98 | roar_err_set(ROAR_ERROR_NOENT); |
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99 | return NULL; |
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100 | } |
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101 | |
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102 | int roar_dtmf_tone (int16_t * samples, const size_t len, const uint32_t rate, const int options, const uint16_t c) { |
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103 | const struct tone * ct = NULL; |
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104 | size_t i; |
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105 | float t; |
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106 | float t_inc = 1./rate; |
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107 | float fc0, fc1; |
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108 | |
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109 | ROAR_DBG("roar_dtmf_tone(samples=%p, len=%llu, rate=%lu, options=%i, c=%i) = ?", samples, (long long unsigned int)len, (long unsigned int)rate, options, (int)c); |
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110 | |
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111 | if ( samples == NULL ) { |
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112 | roar_err_set(ROAR_ERROR_FAULT); |
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113 | return -1; |
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114 | } |
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115 | |
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116 | ct = __lookup_tone(options, c); |
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117 | |
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118 | if ( ct == NULL ) { |
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119 | roar_err_set(ROAR_ERROR_NOENT); |
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120 | return -1; |
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121 | } |
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122 | |
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123 | fc0 = 2. * M_PI * ct->f0; |
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124 | fc1 = 2. * M_PI * ct->f1; |
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125 | |
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126 | // memset(samples, 0, len); |
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127 | |
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128 | for (i = 0, t = 0.; i < len; t += t_inc, i++) { |
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129 | samples[i] = (sinf(fc0*t) + sinf(fc1*t))*8192.0; |
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130 | } |
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131 | |
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132 | return 0; |
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133 | } |
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134 | |
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135 | |
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136 | //ll |
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