1 | //vio_buffer.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 | * |
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6 | * This file is part of libroar 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 | * libroar 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, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | int roar_vio_open_buffer (struct roar_vio_calls * calls, struct roar_vio_calls * dst, ssize_t minsize, int use_re) { |
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39 | struct roar_vio_buffer * self;; |
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40 | |
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41 | if ( calls == NULL || dst == NULL ) |
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42 | return -1; |
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43 | |
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44 | if ( (self = roar_mm_malloc(sizeof(struct roar_vio_buffer))) == NULL ) |
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45 | return -1; |
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46 | |
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47 | memset(self, 0, sizeof(struct roar_vio_buffer)); |
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48 | |
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49 | self->backend = dst; |
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50 | self->min_bufsize = minsize; |
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51 | self->use_re = use_re; |
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52 | |
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53 | if ( use_re ) { |
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54 | if ( roar_vio_open_re(&(self->re_vio), dst) == -1 ) { |
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55 | roar_mm_free(self); |
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56 | return -1; |
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57 | } |
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58 | } |
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59 | |
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60 | memset(calls, 0, sizeof(struct roar_vio_calls)); |
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61 | |
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62 | calls->inst = self; |
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63 | calls->close = roar_vio_buffer_close; |
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64 | calls->write = roar_vio_buffer_write; |
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65 | calls->nonblock = roar_vio_buffer_nonblock; |
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66 | calls->ctl = roar_vio_buffer_ctl; |
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67 | calls->sync = roar_vio_buffer_sync; |
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68 | calls->lseek = roar_vio_buffer_lseek; |
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69 | |
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70 | return 0; |
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71 | } |
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72 | |
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73 | int roar_vio_buffer_close (struct roar_vio_calls * vio) { |
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74 | struct roar_vio_buffer * self = vio->inst; |
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75 | int ret; |
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76 | |
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77 | if ( self->buf_old != NULL ) |
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78 | roar_buffer_free(self->buf_old); |
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79 | |
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80 | if ( self->buf_cur != NULL ) |
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81 | roar_buffer_free(self->buf_cur); |
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82 | |
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83 | if ( self->use_re ) { |
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84 | ret = roar_vio_close(&(self->re_vio)); |
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85 | } else { |
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86 | ret = roar_vio_close(self->backend); |
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87 | } |
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88 | |
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89 | roar_mm_free(self); |
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90 | |
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91 | return ret; |
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92 | } |
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93 | |
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94 | ssize_t roar_vio_buffer_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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95 | struct roar_vio_buffer * self = vio->inst; |
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96 | size_t havelen; |
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97 | size_t buflen; |
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98 | ssize_t ret; |
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99 | |
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100 | if ( count == 0 ) |
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101 | return 0; |
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102 | |
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103 | if ( buf == NULL ) |
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104 | return -1; |
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105 | |
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106 | if ( self->offset.is_old ) { |
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107 | havelen = (self->len_old + self->len_cur) - self->offset.offset; |
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108 | } else { |
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109 | havelen = self->len_cur - self->offset.offset; |
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110 | } |
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111 | |
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112 | if ( havelen == 0 ) { |
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113 | if ( self->use_re ) { |
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114 | ret = roar_vio_read(&(self->re_vio), buf, count); |
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115 | } else { |
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116 | ret = roar_vio_read(self->backend, buf, count); |
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117 | } |
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118 | // TODO... |
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119 | return ret; |
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120 | } else if ( count == havelen ) { |
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121 | if (self->offset.is_old) { |
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122 | buflen = count; |
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123 | if ( roar_buffer_shift_out(&(self->buf_old), buf, &buflen) == -1 ) |
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124 | return -1; |
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125 | |
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126 | if ( self->buf_old != NULL ) // strange error |
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127 | return buflen; |
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128 | |
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129 | buf += buflen; |
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130 | count -= buflen; |
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131 | |
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132 | self->len_old = 0; |
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133 | self->offset.is_old = 0; |
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134 | self->offset.offset = 0; |
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135 | } |
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136 | |
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137 | return -1; |
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138 | |
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139 | } else if ( count < havelen ) { |
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140 | } else if ( count > havelen ) { |
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141 | } |
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142 | |
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143 | return -1; |
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144 | } |
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145 | |
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146 | int roar_vio_buffer_sync (struct roar_vio_calls * vio) { |
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147 | struct roar_vio_buffer * self = vio->inst; |
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148 | struct roar_vio_calls * backend; |
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149 | off_t dst = 0; |
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150 | |
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151 | if ( self->use_re ) { |
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152 | backend = &(self->re_vio); |
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153 | } else { |
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154 | backend = self->backend; |
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155 | } |
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156 | |
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157 | // bring backend in sync state, if this fails we do not need to continue... |
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158 | if ( self->use_re ) { |
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159 | if ( roar_vio_sync(backend) == -1 ) |
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160 | return -1; |
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161 | } else { |
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162 | if ( roar_vio_sync(backend) == -1 ) |
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163 | return -1; |
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164 | } |
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165 | |
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166 | if ( self->buf_old == NULL && self->buf_cur == NULL ) |
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167 | return 0; // we are in sync in case no buffers are currently used. |
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168 | |
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169 | if (self->buf_old != NULL && self->buf_cur == NULL ) { |
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170 | // we just finished the segment |
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171 | roar_buffer_free(self->buf_old); |
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172 | return 0; |
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173 | } |
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174 | |
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175 | // calc seek pos: |
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176 | if ( self->offset.is_old ) { |
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177 | dst = (self->len_cur + self->len_old) - self->offset.offset; |
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178 | } else { |
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179 | dst = self->len_cur - self->offset.offset; |
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180 | } |
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181 | |
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182 | dst = -dst; |
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183 | |
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184 | // do the seek: |
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185 | if ( roar_vio_lseek(backend, dst, SEEK_CUR) == (off_t)-1 ) |
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186 | return -1; |
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187 | |
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188 | // free all internal buffers: |
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189 | if ( self->buf_old != NULL ) |
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190 | roar_buffer_free(self->buf_old); |
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191 | |
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192 | if ( self->buf_cur != NULL ) |
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193 | roar_buffer_free(self->buf_cur); |
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194 | |
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195 | self->offset.is_old = 0; |
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196 | self->offset.offset = 0; |
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197 | |
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198 | // funally bring the backend in sync state again, to be sure all changes are done. |
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199 | if ( self->use_re ) { |
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200 | if ( roar_vio_sync(backend) == -1 ) |
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201 | return -1; |
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202 | } else { |
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203 | if ( roar_vio_sync(backend) == -1 ) |
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204 | return -1; |
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205 | } |
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206 | |
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207 | return 0; |
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208 | } |
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209 | |
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210 | off_t roar_vio_buffer_lseek (struct roar_vio_calls * vio, off_t offset, int whence) { |
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211 | struct roar_vio_buffer * self = vio->inst; |
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212 | size_t newoff; |
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213 | off_t ret; |
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214 | off_t invoff; |
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215 | |
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216 | // in-memory seeking is only supported for SEEK_CUR: |
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217 | if ( whence == SEEK_CUR ) { |
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218 | if ( offset == 0 ) { |
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219 | return 0; |
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220 | } else if ( offset > 0 ) { |
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221 | newoff = self->offset.offset + offset; |
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222 | |
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223 | if ( self->offset.is_old ) { |
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224 | if ( newoff == self->len_old ) { |
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225 | self->offset.is_old = 0; |
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226 | self->offset.offset = 0; |
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227 | self->abspos += offset; |
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228 | return self->abspos; |
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229 | } else if ( newoff < self->len_old ) { |
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230 | self->offset.offset = newoff; |
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231 | self->abspos += offset; |
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232 | return self->abspos; |
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233 | } else if ( newoff > self->len_old ) { |
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234 | if ( newoff < (self->len_old + self->len_cur ) ) { |
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235 | self->offset.is_old = 0; |
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236 | self->offset.offset = offset + self->offset.offset - self->len_old; |
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237 | self->abspos += offset; |
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238 | return self->abspos; |
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239 | } |
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240 | } |
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241 | } else { |
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242 | if ( newoff == self->len_cur ) { |
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243 | roar_buffer_free(self->buf_old); |
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244 | self->buf_old = self->buf_cur; |
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245 | self->buf_cur = NULL; |
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246 | self->offset.offset = 0; |
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247 | self->abspos += offset; |
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248 | return self->abspos; |
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249 | } else if ( newoff < self->len_cur ) { |
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250 | self->offset.offset = newoff; |
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251 | self->abspos += offset; |
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252 | return self->abspos; |
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253 | } |
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254 | } |
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255 | } else { |
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256 | invoff = -offset; |
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257 | |
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258 | if ( invoff <= self->offset.offset ) { |
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259 | self->offset.offset = 0; |
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260 | self->abspos -= invoff; |
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261 | return self->abspos; |
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262 | } |
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263 | |
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264 | if ( !self->offset.is_old ) { |
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265 | if ( invoff > self->offset.offset ) { |
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266 | if ( invoff <= (self->len_old + self->offset.offset) ) { |
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267 | self->offset.is_old = 1; |
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268 | self->offset.offset = (self->len_old + self->offset.offset) - invoff; |
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269 | self->abspos -= invoff; |
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270 | return self->abspos; |
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271 | } |
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272 | } |
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273 | } |
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274 | } |
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275 | } |
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276 | |
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277 | // we need to do a physical seek; |
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278 | // get in sync with current possition, flush all buffers,... |
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279 | if ( roar_vio_buffer_sync(vio) == -1 ) |
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280 | return -1; |
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281 | |
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282 | // do the seek: |
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283 | if ( self->use_re ) { |
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284 | ret = roar_vio_lseek(&(self->re_vio), offset, whence); |
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285 | } else { |
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286 | ret = roar_vio_lseek(self->backend, offset, whence); |
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287 | } |
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288 | |
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289 | if (ret != (off_t)-1) |
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290 | self->abspos = ret; |
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291 | |
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292 | return ret; |
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293 | } |
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294 | |
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295 | int roar_vio_buffer_ctl (struct roar_vio_calls * vio, int cmd, void * data) { |
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296 | struct roar_vio_buffer * self; |
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297 | |
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298 | if (vio == NULL || cmd == -1) |
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299 | return -1; |
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300 | |
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301 | ROAR_DBG("roar_vio_buffer_ctl(vio=%p, cmd=0x%.8x, data=%p) = ?", vio, cmd, data); |
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302 | |
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303 | self = vio->inst; |
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304 | |
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305 | switch (cmd) { |
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306 | case ROAR_VIO_CTL_GET_NAME: |
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307 | if ( data == NULL ) |
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308 | return -1; |
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309 | |
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310 | *(char**)data = "buffer"; |
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311 | return 0; |
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312 | break; |
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313 | case ROAR_VIO_CTL_GET_NEXT: |
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314 | if ( self->use_re ) { |
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315 | *(struct roar_vio_calls **)data = &(self->re_vio); |
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316 | } else { |
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317 | *(struct roar_vio_calls **)data = self->backend; |
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318 | } |
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319 | return 0; |
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320 | break; |
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321 | case ROAR_VIO_CTL_SET_NEXT: |
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322 | if ( self->use_re ) { |
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323 | return roar_vio_ctl(&(self->re_vio), ROAR_VIO_CTL_SET_NEXT, data); |
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324 | } else { |
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325 | self->backend = *(struct roar_vio_calls **)data; |
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326 | } |
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327 | return 0; |
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328 | break; |
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329 | } |
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330 | |
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331 | return roar_vio_ctl((struct roar_vio_calls *) vio->inst, cmd, data); |
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332 | } |
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333 | |
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334 | ssize_t roar_vio_buffer_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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335 | struct roar_vio_buffer * self = vio->inst; |
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336 | |
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337 | if ( self->use_re ) { |
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338 | return roar_vio_write(&(self->re_vio), buf, count); |
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339 | } else { |
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340 | return roar_vio_write(self->backend, buf, count); |
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341 | } |
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342 | } |
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343 | |
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344 | int roar_vio_buffer_nonblock(struct roar_vio_calls * vio, int state) { |
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345 | struct roar_vio_buffer * self = vio->inst; |
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346 | |
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347 | if ( self->use_re ) { |
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348 | return roar_vio_nonblock(&(self->re_vio), state); |
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349 | } else { |
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350 | return roar_vio_nonblock(self->backend, state); |
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351 | } |
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352 | } |
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353 | |
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354 | //ll |
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