1 | //pcm_roar.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 | * Copyright (C) Hans-Kristian 'maister' Arntzen - 2010 |
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6 | * |
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7 | * This file is part of libroar a part of RoarAudio, |
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8 | * a cross-platform sound system for both, home and professional use. |
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9 | * See README for details. |
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10 | * |
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11 | * This file is free software; you can redistribute it and/or modify |
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12 | * it under the terms of the GNU General Public License version 3 |
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13 | * as published by the Free Software Foundation. |
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14 | * |
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15 | * libroar is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 | * GNU General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with this software; see the file COPYING. If not, write to |
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22 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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23 | * Boston, MA 02110-1301, USA. |
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24 | * |
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25 | * NOTE for everyone want's to change something and send patches: |
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26 | * read README and HACKING! There a addition information on |
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27 | * the license of this document you need to read before you send |
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28 | * any patches. |
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29 | * |
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30 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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31 | * or libpulse*: |
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32 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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33 | * and are therefore GPL. Because of this it may be illigal to use |
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34 | * them with any software that uses libesd, libartsc or libpulse*. |
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35 | */ |
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36 | |
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37 | #include "roar.h" |
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38 | |
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39 | // Equvivalent to prepare(). Starts a stream. Might/will be called several times during a program! |
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40 | ///////////////////////////////////////////////// |
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41 | // Status: Should be mostly complete. |
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42 | // Condition for invalid fh is not solved here. |
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43 | //////////////////////////////////////////////// |
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44 | static int roar_pcm_start (snd_pcm_ioplug_t * io) { |
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45 | struct roar_alsa_pcm * self = io->private_data; |
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46 | |
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47 | ROAR_DBG("roar_pcm_start(*) = ?"); |
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48 | |
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49 | // If start is called several times in a row, just ignore it. |
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50 | if (self->stream_opened) |
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51 | return 0; |
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52 | |
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53 | if ( roar_vio_simple_new_stream_obj(&(self->stream_vio), &(self->roar.con), &(self->stream), |
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54 | self->info.rate, self->info.channels, self->info.bits, self->info.codec, |
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55 | io->stream == SND_PCM_STREAM_PLAYBACK ? ROAR_DIR_PLAY : ROAR_DIR_MONITOR |
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56 | ) == -1 ) { |
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57 | return -EINVAL; |
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58 | } |
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59 | |
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60 | int fh; |
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61 | if ( roar_vio_ctl(&(self->stream_vio), |
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62 | io->stream == SND_PCM_STREAM_PLAYBACK ? ROAR_VIO_CTL_GET_SELECT_WRITE_FH : |
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63 | ROAR_VIO_CTL_GET_SELECT_READ_FH, &fh) != 1 ) { |
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64 | io->poll_fd = fh; |
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65 | io->poll_events = io->stream == SND_PCM_STREAM_PLAYBACK ? POLLOUT : POLLIN; |
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66 | } |
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67 | |
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68 | // Oh, no, what should we do here if roar_vio_ctl() fails to grab a valid fh to poll? |
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69 | // In any case, ALSA will error out the next time it tries to poll() if we don't give it a valid fh. |
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70 | |
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71 | snd_pcm_ioplug_reinit_status(io); |
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72 | |
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73 | // Stream is now active, yay. |
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74 | self->stream_opened = 1; |
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75 | |
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76 | self->bufptr = 0; |
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77 | self->thread_active = 1; // We have to activate the thread before starting it, because the thread lives on that thread_active is 1. |
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78 | if ( pthread_create(&(self->thread), NULL, roar_thread, self) < 0 ) { |
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79 | self->thread_active = 0; |
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80 | return -1; |
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81 | } |
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82 | |
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83 | return 0; |
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84 | } |
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85 | |
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86 | void roar_reset(struct roar_alsa_pcm *self) { |
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87 | if ( !self->stream_opened ) |
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88 | return; |
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89 | |
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90 | roar_vio_close(&(self->stream_vio)); |
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91 | self->stream_opened = 0; |
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92 | self->thread_active = 0; |
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93 | self->bufptr = 0; |
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94 | self->last_ptr = 0; |
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95 | self->total_written = 0; |
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96 | self->has_written = 0; |
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97 | } |
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98 | |
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99 | |
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100 | |
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101 | // Simply stopping the stream. Will need to be restarted to play more. |
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102 | // Will be called several times together with roar_pcm_start() |
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103 | /////////////////////////////////////////////////// |
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104 | // Status: Still needs some error checking for the pthread calls, but |
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105 | // should work. |
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106 | ////////////////////////////////////////////////// |
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107 | static int roar_pcm_stop (snd_pcm_ioplug_t *io) { |
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108 | struct roar_alsa_pcm * self = io->private_data; |
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109 | |
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110 | // If this is called several times in a row, just ignore. |
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111 | |
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112 | ROAR_DBG("roar_pcm_stop(*) = 0"); |
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113 | |
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114 | |
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115 | if ( self->thread_active ) { |
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116 | self->thread_active = 0; |
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117 | pthread_cond_signal(&(self->cond)); |
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118 | pthread_join(self->thread, NULL); |
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119 | } |
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120 | |
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121 | roar_reset(self); |
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122 | |
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123 | return 0; |
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124 | } |
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125 | |
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126 | /////////////////////////////// |
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127 | // Status: Should be complete. |
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128 | /////////////////////////////// |
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129 | static int roar_hw_constraint(struct roar_alsa_pcm * self) { |
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130 | snd_pcm_ioplug_t *io = &(self->io); |
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131 | static const snd_pcm_access_t access_list[] = { |
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132 | SND_PCM_ACCESS_RW_INTERLEAVED |
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133 | }; |
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134 | static const unsigned int formats[] = { |
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135 | SND_PCM_FORMAT_S8, |
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136 | SND_PCM_FORMAT_U8, |
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137 | SND_PCM_FORMAT_A_LAW, |
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138 | SND_PCM_FORMAT_MU_LAW, |
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139 | SND_PCM_FORMAT_S16_LE, |
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140 | SND_PCM_FORMAT_S16_BE, |
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141 | SND_PCM_FORMAT_U16_LE, |
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142 | SND_PCM_FORMAT_U16_BE, |
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143 | SND_PCM_FORMAT_S32_LE, |
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144 | SND_PCM_FORMAT_S32_BE, |
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145 | SND_PCM_FORMAT_U32_LE, |
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146 | SND_PCM_FORMAT_U32_BE, |
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147 | SND_PCM_FORMAT_S24_3LE, |
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148 | SND_PCM_FORMAT_S24_3BE, |
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149 | SND_PCM_FORMAT_U24_3LE, |
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150 | SND_PCM_FORMAT_U24_3BE, |
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151 | }; |
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152 | int ret; |
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153 | |
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154 | ROAR_DBG("roar_hw_constraint(*) = ?"); |
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155 | |
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156 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_ACCESS, |
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157 | _as(access_list), access_list)) < 0 ) |
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158 | return ret; |
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159 | |
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160 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_FORMAT, |
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161 | _as(formats), formats)) < 0 ) |
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162 | return ret; |
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163 | |
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164 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_CHANNELS, |
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165 | 1, ROAR_MAX_CHANNELS)) < 0 ) |
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166 | return ret; |
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167 | |
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168 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_RATE, 8000, 192000)) < 0 ) |
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169 | return ret; |
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170 | |
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171 | // We shouldn't let ALSA use extremely low or high values, it will kill a kitty most likely. :v |
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172 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, 1 << 6, 1 << 18)) < 0 ) |
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173 | return ret; |
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174 | |
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175 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIODS, 1, 1024)) < 0 ) |
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176 | return ret; |
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177 | |
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178 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES, 1 << 13, 1 << 24)) < 0 ) |
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179 | return ret; |
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180 | |
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181 | ROAR_DBG("roar_hw_constraint(*) = 0"); |
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182 | |
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183 | return 0; |
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184 | } |
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185 | |
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186 | // Referring to alsa-lib/src/pcm/pcm_ioplug.c : snd_pcm_ioplug_hw_ptr_update |
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187 | /////////////////////////////////////////////////////////// |
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188 | // Status: Mostly complete, but uses a really nasty hack! |
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189 | /////////////////////////////////////////////////////////// |
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190 | static snd_pcm_sframes_t roar_pcm_pointer(snd_pcm_ioplug_t *io) { |
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191 | struct roar_alsa_pcm * self = io->private_data; |
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192 | int ptr; |
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193 | |
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194 | ROAR_DBG("roar_pcm_pointer(*) = ?"); |
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195 | // Did ALSA just call snd_pcm_reset() or something like that without calling the plugin? |
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196 | // We should restart our stream as well. |
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197 | if ( io->appl_ptr < self->last_ptr ) { |
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198 | roar_pcm_stop(io); |
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199 | roar_pcm_start(io); |
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200 | } |
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201 | |
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202 | // ALSA has a weird way of calculating how much data can be written to the audio buffer. |
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203 | // It uses the formula: |
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204 | // avail = bufsize + ptr - io->appl_ptr; (??!?) |
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205 | // We really want this: |
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206 | // avail = bufsize - ptr; |
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207 | // This is the obvious way, so we have to manipulate ptr like this: |
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208 | // ptr = io->appl_ptr - ptr; |
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209 | |
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210 | pthread_mutex_lock(&(self->lock)); |
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211 | ptr = snd_pcm_bytes_to_frames(io->pcm, self->bufptr); |
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212 | pthread_mutex_unlock(&(self->lock)); |
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213 | |
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214 | ptr = io->appl_ptr - ptr; |
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215 | self->last_ptr = io->appl_ptr; |
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216 | |
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217 | ROAR_DBG("roar_pcm_pointer(*) appl_ptr: %i, ptr: %i, calculated avail frames: %i", (int)io->appl_ptr, (int)ptr, (int)(io->appl_ptr - ptr)); |
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218 | ROAR_DBG("roar_pcm_pointer(*) = %i", ptr); |
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219 | return ptr; |
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220 | } |
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221 | |
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222 | // TODO: FIXME: add support for reading data! |
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223 | ////////////////////////////////////////////////// |
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224 | // Status: For writing, this should be complete. |
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225 | ////////////////////////////////////////////////// |
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226 | static snd_pcm_sframes_t roar_pcm_transfer(snd_pcm_ioplug_t *io, |
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227 | const snd_pcm_channel_area_t *areas, |
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228 | snd_pcm_uframes_t offset, |
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229 | snd_pcm_uframes_t size) { |
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230 | struct roar_alsa_pcm * self = io->private_data; |
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231 | char * buf; |
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232 | size_t len = size * self->info.channels * self->info.bits / 8; |
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233 | ssize_t ret; |
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234 | |
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235 | ROAR_DBG("roar_pcm_transfer(*) = ?"); |
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236 | ROAR_DBG("roar_pcm_transfer(*): len=%lu", (long unsigned int) len); |
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237 | |
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238 | // Weird ALSA stuff. |
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239 | buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8; |
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240 | |
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241 | ret = roar_write(self, buf, len); |
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242 | |
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243 | if ( ret == -1 ) |
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244 | return -EIO; |
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245 | |
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246 | ROAR_DBG("roar_pcm_transfer(*) = %lli", (long long int)size); |
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247 | return size; |
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248 | } |
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249 | |
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250 | /////////////////////////////////////////////////////////////////// |
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251 | // Status: Still missing proper delay measurements from the roar server. |
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252 | // Only uses a blind timer now. In ideal conditions, this will work well. |
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253 | /////////////////////////////////////////////////////////////////// |
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254 | static int roar_pcm_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp) { |
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255 | struct roar_alsa_pcm * self = io->private_data; |
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256 | |
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257 | ROAR_DBG("roar_pcm_delay(*) = ?"); |
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258 | |
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259 | // TODO: We need to set *delayp the latency in frames. |
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260 | pthread_mutex_lock(&(self->lock)); |
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261 | roar_drain(self); |
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262 | *delayp = snd_pcm_bytes_to_frames(io->pcm, self->bytes_in_buffer); |
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263 | pthread_mutex_unlock(&(self->lock)); |
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264 | |
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265 | return 0; |
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266 | } |
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267 | |
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268 | //////////////////// |
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269 | // Status: Complete |
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270 | //////////////////// |
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271 | static int roar_pcm_prepare(snd_pcm_ioplug_t *io) { |
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272 | ROAR_DBG("roar_pcm_prepare(*) = ?"); |
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273 | |
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274 | return roar_pcm_start(io); |
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275 | } |
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276 | |
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277 | /////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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278 | // Status: This should be mostly complete. |
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279 | // I'm not sure if hw_params can be called several times during one stream without stop() start() in between. |
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280 | // This will mean a memory leak, and possibly breakage should the buffer size change itself. |
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281 | /////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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282 | static int roar_pcm_hw_params(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params) { |
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283 | struct roar_alsa_pcm * self = io->private_data; |
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284 | |
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285 | ROAR_DBG("roar_pcm_hw_params(*) = ?"); |
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286 | |
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287 | self->info.channels = io->channels; |
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288 | self->info.rate = io->rate; |
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289 | |
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290 | switch (io->format) { |
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291 | case SND_PCM_FORMAT_S8: |
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292 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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293 | self->info.bits = 8; |
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294 | break; |
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295 | case SND_PCM_FORMAT_U8: |
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296 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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297 | self->info.bits = 8; |
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298 | break; |
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299 | case SND_PCM_FORMAT_A_LAW: |
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300 | self->info.codec = ROAR_CODEC_ALAW; |
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301 | self->info.bits = 8; |
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302 | break; |
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303 | case SND_PCM_FORMAT_MU_LAW: |
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304 | self->info.codec = ROAR_CODEC_MULAW; |
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305 | self->info.bits = 8; |
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306 | break; |
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307 | case SND_PCM_FORMAT_S16_LE: |
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308 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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309 | self->info.bits = 16; |
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310 | break; |
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311 | case SND_PCM_FORMAT_S16_BE: |
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312 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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313 | self->info.bits = 16; |
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314 | break; |
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315 | case SND_PCM_FORMAT_U16_LE: |
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316 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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317 | self->info.bits = 16; |
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318 | break; |
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319 | case SND_PCM_FORMAT_U16_BE: |
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320 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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321 | self->info.bits = 16; |
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322 | break; |
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323 | case SND_PCM_FORMAT_S32_LE: |
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324 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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325 | self->info.bits = 32; |
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326 | break; |
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327 | case SND_PCM_FORMAT_S32_BE: |
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328 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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329 | self->info.bits = 32; |
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330 | break; |
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331 | case SND_PCM_FORMAT_U32_LE: |
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332 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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333 | self->info.bits = 32; |
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334 | break; |
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335 | case SND_PCM_FORMAT_U32_BE: |
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336 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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337 | self->info.bits = 32; |
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338 | break; |
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339 | case SND_PCM_FORMAT_S24_3LE: |
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340 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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341 | self->info.bits = 24; |
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342 | break; |
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343 | case SND_PCM_FORMAT_S24_3BE: |
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344 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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345 | self->info.bits = 24; |
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346 | break; |
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347 | case SND_PCM_FORMAT_U24_3LE: |
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348 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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349 | self->info.bits = 24; |
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350 | break; |
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351 | case SND_PCM_FORMAT_U24_3BE: |
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352 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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353 | self->info.bits = 24; |
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354 | break; |
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355 | default: |
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356 | return -EINVAL; |
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357 | } |
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358 | |
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359 | snd_pcm_uframes_t buffersize; |
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360 | int err; |
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361 | |
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362 | if ((err = snd_pcm_hw_params_get_buffer_size(params, &buffersize) < 0)) |
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363 | return err; |
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364 | |
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365 | ROAR_DBG("roar_pcm_hw_params(*) buffersize (bytes): %i", (int)buffersize); |
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366 | |
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367 | //self->bufsize = snd_pcm_frames_to_bytes(io->pcm, buffersize); |
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368 | self->bufsize = self->info.bits * self->info.channels * buffersize / 8; |
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369 | self->buffer = malloc(self->bufsize); |
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370 | if (self->buffer == NULL) |
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371 | return -1; |
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372 | self->bufptr = 0; |
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373 | |
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374 | ROAR_DBG("roar_pcm_hw_params(*) Setting buffersize (bytes): %i", (int)self->bufsize); |
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375 | ROAR_DBG("roar_pcm_hw_params(*) = 0"); |
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376 | return 0; |
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377 | } |
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378 | |
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379 | /////////////////////////////////// |
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380 | // Status: This should be complete. |
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381 | // This is the last cleanup function to be called by ALSA. |
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382 | /////////////////////////////////// |
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383 | static int roar_pcm_close (snd_pcm_ioplug_t * io) { |
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384 | struct roar_alsa_pcm * self = io->private_data; |
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385 | |
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386 | ROAR_DBG("roar_pcm_close(*) = ?"); |
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387 | |
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388 | roar_disconnect(&(self->roar.con)); |
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389 | |
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390 | pthread_mutex_destroy(&(self->lock)); |
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391 | pthread_mutex_destroy(&(self->cond_lock)); |
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392 | pthread_cond_destroy(&(self->cond)); |
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393 | |
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394 | free(self->buffer); |
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395 | free(self); |
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396 | |
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397 | return 0; |
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398 | } |
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399 | |
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400 | static snd_pcm_ioplug_callback_t roar_pcm_callback = { |
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401 | .start = roar_pcm_start, |
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402 | .stop = roar_pcm_stop, |
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403 | .pointer = roar_pcm_pointer, |
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404 | .transfer = roar_pcm_transfer, |
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405 | .delay = roar_pcm_delay, |
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406 | .prepare = roar_pcm_prepare, |
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407 | .hw_params = roar_pcm_hw_params, |
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408 | .close = roar_pcm_close, |
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409 | }; |
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410 | |
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411 | SND_PCM_PLUGIN_DEFINE_FUNC(roar) { |
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412 | struct roar_alsa_pcm * self; |
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413 | snd_config_iterator_t i, next; |
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414 | snd_config_t * n; |
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415 | const char * para; |
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416 | const char * server = NULL; |
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417 | int ret; |
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418 | |
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419 | (void)root; |
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420 | |
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421 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = ?"); |
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422 | |
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423 | snd_config_for_each(i, next, conf) { |
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424 | n = snd_config_iterator_entry(i); |
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425 | if ( snd_config_get_id(n, ¶) < 0 ) |
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426 | continue; |
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427 | |
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428 | if ( !strcmp(para, "type") || !strcmp(para, "comment") ) |
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429 | continue; |
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430 | |
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431 | if ( !strcmp(para, "server") ) { |
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432 | if (snd_config_get_string(n, &server) < 0) { |
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433 | return -EINVAL; |
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434 | } |
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435 | } else { |
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436 | return -EINVAL; |
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437 | } |
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438 | } |
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439 | |
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440 | errno = ENOSYS; |
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441 | |
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442 | if ( (self = malloc(sizeof(struct roar_alsa_pcm))) == NULL ) |
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443 | return -errno; |
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444 | |
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445 | memset(self, 0, sizeof(struct roar_alsa_pcm)); |
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446 | |
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447 | errno = ENOSYS; |
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448 | if ( roar_simple_connect(&(self->roar.con), (char*)server, "ALSA Plugin") == -1 ) { |
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449 | free(self); |
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450 | return -errno; |
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451 | } |
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452 | |
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453 | self->io.version = SND_PCM_IOPLUG_VERSION; |
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454 | self->io.name = "RoarAudio Plugin"; |
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455 | self->io.poll_fd = -1; |
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456 | self->io.poll_events = POLLOUT; |
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457 | self->io.mmap_rw = 0; |
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458 | self->io.callback = &roar_pcm_callback; |
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459 | self->io.private_data = self; |
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460 | |
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461 | if ( (ret = snd_pcm_ioplug_create(&(self->io), name, stream, mode)) < 0 ) { |
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462 | roar_disconnect(&(self->roar.con)); |
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463 | free(self); |
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464 | return ret; |
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465 | } |
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466 | |
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467 | pthread_mutex_init(&(self->lock), NULL); |
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468 | pthread_mutex_init(&(self->cond_lock), NULL); |
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469 | pthread_cond_init(&(self->cond), NULL); |
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470 | |
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471 | |
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472 | if ( (ret = roar_hw_constraint(self)) < 0 ) { |
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473 | snd_pcm_ioplug_delete(&(self->io)); |
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474 | roar_disconnect(&(self->roar.con)); |
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475 | free(self); |
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476 | return ret; |
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477 | } |
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478 | |
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479 | *pcmp = self->io.pcm; |
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480 | |
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481 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = 0"); |
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482 | |
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483 | return 0; |
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484 | } |
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485 | |
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486 | SND_PCM_PLUGIN_SYMBOL(roar); |
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487 | |
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488 | int __snd_pcm_roar_open_dlsym_pcm_001 (void) { |
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489 | ROAR_DBG("__snd_pcm_roar_open_dlsym_pcm_001(void) = 0"); |
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490 | return 0; |
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491 | } |
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492 | |
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493 | //ll |
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