1 | //libartsc.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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5 | * The code (may) include prototypes and comments (and maybe |
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6 | * other code fragements) from libarts*. They are mostly copyrighted by: |
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7 | * Stefan Westerfeld <stefan@space.twc.de> |
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8 | * |
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9 | * This file is part of libroararts a part of RoarAudio, |
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10 | * a cross-platform sound system for both, home and professional use. |
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11 | * See README for details. |
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12 | * |
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13 | * This file is free software; you can redistribute it and/or modify |
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14 | * it under the terms of the GNU General Public License version 3 |
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15 | * as published by the Free Software Foundation. |
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16 | * |
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17 | * RoarAudio is distributed in the hope that it will be useful, |
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
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23 | * along with this software; see the file COPYING. If not, write to |
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24 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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25 | * |
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26 | * NOTE for everyone want's to change something and send patches: |
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27 | * read README and HACKING! There a addition information on |
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28 | * the license of this document you need to read before you send |
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29 | * any patches. |
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30 | * |
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31 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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32 | * or libpulse*: |
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33 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
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34 | * and are therefore GPL. Because of this it may be illigal to use |
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35 | * them with any software that uses libesd, libartsc or libpulse*. |
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36 | */ |
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37 | |
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38 | #include <roaraudio.h> |
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39 | #include <kde/artsc/artsc.h> |
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40 | |
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41 | struct roar_connection _libroarartsc_connection[1]; |
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42 | |
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43 | struct _libroarartsc_stream { |
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44 | struct roar_stream stream; |
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45 | int fh; |
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46 | int blocking; |
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47 | int block_size; |
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48 | int dir; |
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49 | }; |
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50 | |
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51 | int arts_init(void) { |
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52 | return roar_simple_connect(_libroarartsc_connection, NULL, "libroarartsc client"); |
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53 | } |
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54 | |
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55 | void arts_free(void) { |
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56 | roar_disconnect(_libroarartsc_connection); |
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57 | } |
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58 | |
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59 | /** |
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60 | * asks aRtsd to free the DSP device and return 1 if it was successful, |
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61 | * 0 if there were active non-suspendable modules |
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62 | */ |
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63 | int arts_suspend(void) { |
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64 | return roar_set_standby(_libroarartsc_connection, ROAR_STANDBY_ACTIVE) == 0 ? 1 : 0; |
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65 | } |
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66 | |
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67 | /** |
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68 | * asks aRtsd if the DSP device is free and return 1 if it is, |
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69 | * 0 if not |
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70 | */ |
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71 | int arts_suspended(void) { |
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72 | return roar_get_standby(_libroarartsc_connection) == ROAR_STANDBY_ACTIVE; |
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73 | } |
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74 | |
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75 | |
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76 | /** |
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77 | * converts an error code to a human readable error message |
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78 | * |
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79 | * @param errorcode the errorcode (from another arts function that failed) |
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80 | * @returns a text string with the error message |
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81 | */ |
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82 | const char *arts_error_text(int errorcode) { |
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83 | return strerror(errorcode); |
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84 | } |
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85 | |
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86 | /** |
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87 | * open a stream for playing |
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88 | * |
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89 | * @param rate the sampling rate (something like 44100) |
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90 | * @param bits how many bits each sample has (8 or 16) |
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91 | * @param channels how many channels, 1 is mono, 2 is stereo |
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92 | * @param name the name of the stream (these will be used so that the user can |
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93 | * assign streams to effects/mixer channels and similar) |
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94 | * |
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95 | * @return a stream |
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96 | */ |
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97 | arts_stream_t arts_play_stream(int rate, int bits, int channels, const char *name) { |
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98 | struct _libroarartsc_stream * s = malloc(sizeof(struct _libroarartsc_stream)); |
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99 | struct roar_meta meta; |
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100 | struct roar_stream_info info; |
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101 | |
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102 | if ( !s ) |
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103 | return NULL; |
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104 | |
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105 | if ( (s->fh = roar_simple_new_stream_obj(_libroarartsc_connection, &(s->stream), |
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106 | rate, channels, bits, ROAR_CODEC_DEFAULT, ROAR_DIR_PLAY)) == -1 ) { |
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107 | free(s); |
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108 | return NULL; |
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109 | } |
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110 | |
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111 | s->dir = ROAR_DIR_PLAY; |
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112 | |
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113 | s->blocking = 1; |
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114 | |
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115 | if ( roar_stream_get_info(_libroarartsc_connection, &(s->stream), &info) != -1 ) { |
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116 | s->block_size = info.block_size; |
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117 | } else { |
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118 | close(s->fh); |
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119 | free(s); |
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120 | return NULL; |
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121 | } |
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122 | |
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123 | if ( name && *name ) { |
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124 | meta.value = (char*)name; |
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125 | meta.key[0] = 0; |
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126 | meta.type = ROAR_META_TYPE_DESCRIPTION; |
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127 | |
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128 | roar_stream_meta_set(_libroarartsc_connection, &(s->stream), ROAR_META_MODE_SET, &meta); |
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129 | } |
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130 | |
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131 | return (arts_stream_t) s; |
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132 | } |
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133 | |
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134 | /** |
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135 | * open a stream for recording |
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136 | * |
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137 | * @param rate the sampling rate (something like 44100) |
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138 | * @param bits how many bits each sample has (8 or 16) |
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139 | * @param channels how many channels, 1 is mono, 2 is stereo |
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140 | * @param name the name of the stream (these will be used so that the user can |
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141 | * assign streams to effects/mixer channels and similar) |
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142 | * |
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143 | * @return a stream |
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144 | */ |
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145 | arts_stream_t arts_record_stream(int rate, int bits, int channels, const char *name) { |
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146 | struct _libroarartsc_stream * s = malloc(sizeof(struct _libroarartsc_stream)); |
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147 | struct roar_meta meta; |
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148 | struct roar_stream_info info; |
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149 | |
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150 | if ( !s ) |
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151 | return NULL; |
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152 | |
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153 | if ( (s->fh = roar_simple_new_stream_obj(_libroarartsc_connection, &(s->stream), |
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154 | rate, channels, bits, ROAR_CODEC_DEFAULT, ROAR_DIR_RECORD)) == -1 ) { |
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155 | free(s); |
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156 | return NULL; |
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157 | } |
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158 | |
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159 | s->dir = ROAR_DIR_RECORD; |
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160 | |
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161 | s->blocking = 1; |
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162 | |
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163 | if ( roar_stream_get_info(_libroarartsc_connection, &(s->stream), &info) != -1 ) { |
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164 | s->block_size = info.block_size; |
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165 | } else { |
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166 | close(s->fh); |
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167 | free(s); |
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168 | return NULL; |
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169 | } |
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170 | |
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171 | if ( name && *name ) { |
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172 | meta.value = (char*)name; |
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173 | meta.key[0] = 0; |
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174 | meta.type = ROAR_META_TYPE_DESCRIPTION; |
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175 | |
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176 | roar_stream_meta_set(_libroarartsc_connection, &(s->stream), ROAR_META_MODE_SET, &meta); |
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177 | } |
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178 | |
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179 | return (arts_stream_t) s; |
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180 | } |
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181 | |
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182 | /** |
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183 | * close a stream |
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184 | */ |
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185 | void arts_close_stream(arts_stream_t stream) { |
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186 | struct _libroarartsc_stream * s = (struct _libroarartsc_stream *) stream; |
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187 | if ( !stream ) |
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188 | return; |
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189 | |
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190 | close(s->fh); |
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191 | |
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192 | free(stream); |
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193 | } |
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194 | |
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195 | /** |
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196 | * read samples from stream |
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197 | * |
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198 | * @param stream a previously opened record stream |
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199 | * @param buffer a buffer with sample data |
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200 | * @param count the number of bytes contained in the buffer |
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201 | * |
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202 | * @returns number of read bytes on success or error code |
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203 | */ |
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204 | int arts_read(arts_stream_t stream, void *buffer, int count) { |
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205 | struct _libroarartsc_stream * s = (struct _libroarartsc_stream *) stream; |
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206 | if ( !stream ) |
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207 | return -1; |
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208 | |
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209 | return read(s->fh, buffer, count); |
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210 | } |
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211 | |
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212 | /** |
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213 | * write samples to to stream |
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214 | * |
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215 | * @param stream a previously opened play stream |
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216 | * @param buffer a buffer with sample data |
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217 | * @param count the number of bytes contained in the buffer |
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218 | * |
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219 | * @returns number of written bytes on success or error code |
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220 | */ |
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221 | int arts_write(arts_stream_t stream, const void *buffer, int count) { |
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222 | struct _libroarartsc_stream * s = (struct _libroarartsc_stream *) stream; |
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223 | if ( !stream ) |
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224 | return -1; |
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225 | |
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226 | return write(s->fh, buffer, count); |
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227 | } |
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228 | |
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229 | /** |
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230 | * configure a parameter of a stream |
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231 | * |
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232 | * @param stream an opened record or play stream |
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233 | * @param parameter the parameter you want to modify |
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234 | * @param value the new value |
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235 | * |
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236 | * @returns the new value of the parameter (which may or may not be the value |
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237 | * you wanted to have), or an error code if something went wrong |
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238 | */ |
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239 | int arts_stream_set(arts_stream_t stream, arts_parameter_t param, int value) { |
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240 | struct _libroarartsc_stream * s = (struct _libroarartsc_stream *) stream; |
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241 | if ( !stream ) |
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242 | return -1; |
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243 | |
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244 | if ( param == ARTS_P_BLOCKING ) { |
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245 | if ( roar_socket_nonblock(s->fh, value ? ROAR_SOCKET_BLOCK : ROAR_SOCKET_NONBLOCK) == -1 ) |
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246 | return -1; |
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247 | return arts_stream_get(stream, param); |
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248 | } |
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249 | |
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250 | return arts_stream_get(stream, param); |
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251 | } |
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252 | |
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253 | /** |
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254 | * query a parameter of a stream |
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255 | * |
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256 | * @param stream an opened record or play stream |
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257 | * @param parameter the parameter you want to query |
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258 | * |
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259 | * @returns the value of the parameter, or an error code |
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260 | */ |
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261 | int arts_stream_get(arts_stream_t stream, arts_parameter_t param) { |
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262 | struct _libroarartsc_stream * s = (struct _libroarartsc_stream *) stream; |
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263 | fd_set sl; |
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264 | struct timeval tv; |
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265 | |
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266 | if ( !stream ) |
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267 | return -1; |
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268 | |
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269 | if ( param == ARTS_P_PACKET_SIZE ) { |
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270 | return s->block_size; |
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271 | } else if ( param == ARTS_P_BUFFER_SPACE ) { |
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272 | FD_ZERO(&sl); |
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273 | FD_SET(s->fh, &sl); |
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274 | |
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275 | tv.tv_sec = 0; |
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276 | tv.tv_usec = 1; |
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277 | |
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278 | if ( s->dir == ROAR_DIR_PLAY ) { |
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279 | if (select(s->fh + 1, NULL, &sl, NULL, &tv) > 0) |
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280 | return s->block_size; |
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281 | } else { |
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282 | if (select(s->fh + 1, &sl, NULL, NULL, &tv) > 0) |
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283 | return s->block_size; |
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284 | } |
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285 | |
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286 | return 0; |
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287 | } else if ( param == ARTS_P_BUFFER_SIZE ) { |
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288 | return s->block_size*2; |
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289 | } else if ( param == ARTS_P_PACKET_COUNT ) { |
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290 | return 1; |
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291 | } else if ( param == ARTS_P_BLOCKING ) { |
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292 | return s->blocking; |
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293 | } |
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294 | |
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295 | return -1; |
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296 | } |
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297 | |
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298 | //ll |
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