1 | //volume.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * The code (may) include prototypes and comments (and maybe |
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6 | * other code fragements) from libpulse*. They are mostly copyrighted by: |
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7 | * Lennart Poettering <poettering@users.sourceforge.net> and |
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8 | * Pierre Ossman <drzeus@drzeus.cx> |
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9 | * |
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10 | * This file is part of libroarpulse a part of RoarAudio, |
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11 | * a cross-platform sound system for both, home and professional use. |
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12 | * See README for details. |
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13 | * |
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14 | * This file is free software; you can redistribute it and/or modify |
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15 | * it under the terms of the GNU General Public License version 3 |
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16 | * as published by the Free Software Foundation. |
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17 | * |
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18 | * RoarAudio is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 | * GNU General Public License for more details. |
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22 | * |
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23 | * You should have received a copy of the GNU General Public License |
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24 | * along with this software; see the file COPYING. If not, write to |
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25 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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26 | * |
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27 | * NOTE for everyone want's to change something and send patches: |
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28 | * read README and HACKING! There a addition information on |
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29 | * the license of this document you need to read before you send |
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30 | * any patches. |
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31 | * |
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32 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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33 | * or libpulse*: |
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34 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
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35 | * and are therefore GPL. Because of this it may be illigal to use |
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36 | * them with any software that uses libesd, libartsc or libpulse*. |
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37 | */ |
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38 | |
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39 | #include <libroarpulse/libroarpulse.h> |
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40 | |
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41 | /** Return non-zero when *a == *b */ |
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42 | int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) { |
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43 | int i; |
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44 | |
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45 | if ( a == b ) |
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46 | return 1; |
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47 | |
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48 | if ( a == NULL || b == NULL ) |
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49 | return 0; |
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50 | |
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51 | if ( a->channels != b->channels ) |
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52 | return 0; |
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53 | |
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54 | for (i = 0; i < a->channels; i++) |
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55 | if ( a->values[i] != b->values[i] ) |
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56 | return 0; |
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57 | |
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58 | return 1; |
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59 | } |
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60 | |
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61 | /** Set the volume of all channels to the specified parameter */ |
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62 | pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) { |
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63 | int i; |
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64 | |
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65 | if ( a == NULL ) |
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66 | return NULL; |
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67 | |
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68 | if ( channels > PA_CHANNELS_MAX ) |
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69 | return NULL; |
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70 | |
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71 | a->channels = channels; |
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72 | |
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73 | for (i = 0; i < channels; i++) { |
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74 | a->values[i] = v; |
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75 | } |
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76 | |
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77 | return a; |
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78 | } |
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79 | |
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80 | /** Pretty print a volume structure */ |
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81 | char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c); |
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82 | |
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83 | /** Return the average volume of all channels */ |
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84 | pa_volume_t pa_cvolume_avg(const pa_cvolume *a) { |
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85 | int64_t sum = 0; |
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86 | int i; |
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87 | |
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88 | #ifndef PA_VOLUME_INVALID |
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89 | #define PA_VOLUME_INVALID ((pa_volume_t) UINT32_MAX) |
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90 | #endif |
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91 | |
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92 | if ( a == NULL ) |
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93 | return PA_VOLUME_INVALID; |
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94 | |
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95 | for (i = 0; i < a->channels; i++) |
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96 | sum += a->values[i]; |
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97 | |
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98 | return sum/a->channels; |
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99 | } |
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100 | |
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101 | /** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */ |
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102 | int pa_cvolume_valid(const pa_cvolume *v) { |
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103 | if ( v == NULL ) |
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104 | return 0; |
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105 | |
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106 | if ( v->channels <= 0 ) |
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107 | return 0; |
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108 | |
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109 | if ( v->channels > PA_CHANNELS_MAX ) |
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110 | return 0; |
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111 | |
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112 | return 1; |
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113 | } |
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114 | |
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115 | /** Return non-zero if the volume of all channels is equal to the specified value */ |
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116 | int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) { |
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117 | int i; |
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118 | |
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119 | if ( a == NULL ) |
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120 | return 0; |
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121 | |
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122 | for (i = 0; i < a->channels; i++) |
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123 | if ( a->values[i] != v ) |
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124 | return 0; |
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125 | |
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126 | return 1; |
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127 | } |
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128 | |
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129 | /** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. This is only valid for software volumes! */ |
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130 | pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b); |
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131 | |
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132 | /** Multiply to per-channel volumes and return the result in *dest. This is only valid for software volumes! */ |
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133 | pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b); |
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134 | |
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135 | /** Convert a decibel value to a volume. This is only valid for software volumes! \since 0.4 */ |
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136 | pa_volume_t pa_sw_volume_from_dB(double f); |
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137 | |
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138 | /** Convert a volume to a decibel value. This is only valid for software volumes! \since 0.4 */ |
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139 | double pa_sw_volume_to_dB(pa_volume_t v); |
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140 | |
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141 | /** Convert a linear factor to a volume. This is only valid for software volumes! \since 0.8 */ |
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142 | pa_volume_t pa_sw_volume_from_linear(double v); |
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143 | |
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144 | /** Convert a volume to a linear factor. This is only valid for software volumes! \since 0.8 */ |
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145 | double pa_sw_volume_to_linear(pa_volume_t v); |
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146 | |
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147 | //ll |
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