1 | //pcm.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 "roar.h" |
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37 | |
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38 | static int roar_hw_constraint(struct roar_alsa_pcm * self) { |
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39 | snd_pcm_ioplug_t *io = &(self->io); |
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40 | static const snd_pcm_access_t access_list[] = { |
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41 | SND_PCM_ACCESS_RW_INTERLEAVED |
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42 | }; |
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43 | static const unsigned int formats[] = { |
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44 | // TODO: add list of additioal formats we support |
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45 | SND_PCM_FORMAT_U8, |
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46 | SND_PCM_FORMAT_A_LAW, |
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47 | SND_PCM_FORMAT_MU_LAW, |
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48 | SND_PCM_FORMAT_S16_LE, |
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49 | SND_PCM_FORMAT_S16_BE, |
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50 | }; |
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51 | int ret; |
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52 | |
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53 | ROAR_DBG("roar_hw_constraint(*) = ?"); |
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54 | |
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55 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_ACCESS, |
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56 | _as(access_list), access_list)) < 0 ) |
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57 | return ret; |
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58 | |
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59 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_FORMAT, |
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60 | _as(formats), formats)) < 0 ) |
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61 | return ret; |
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62 | |
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63 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_CHANNELS, |
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64 | 1, ROAR_MAX_CHANNELS)) < 0 ) |
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65 | return ret; |
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66 | |
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67 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_RATE, 8000, 192000)) < 0 ) |
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68 | return ret; |
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69 | |
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70 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, 1, 4294967295U)) < 0 ) |
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71 | return ret; |
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72 | |
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73 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIODS, 1, 4294967295U)) < 0 ) |
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74 | return ret; |
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75 | |
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76 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES, 1, 4294967295U)) < 0 ) |
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77 | return ret; |
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78 | |
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79 | ROAR_DBG("roar_hw_constraint(*) = 0"); |
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80 | |
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81 | return 0; |
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82 | } |
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83 | |
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84 | static int roar_pcm_dummy (snd_pcm_ioplug_t * io) { |
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85 | ROAR_DBG("roar_pcm_dummy(*) = 0"); |
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86 | return 0; |
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87 | } |
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88 | |
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89 | static snd_pcm_sframes_t roar_pcm_pointer(snd_pcm_ioplug_t *io) { |
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90 | struct roar_alsa_pcm * self = io->private_data; |
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91 | |
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92 | ROAR_DBG("roar_pcm_pointer(*) = ?"); |
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93 | |
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94 | return snd_pcm_bytes_to_frames(io->pcm, self->writec); |
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95 | } |
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96 | |
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97 | // TODO: FIXME: add support for reading data! |
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98 | static snd_pcm_sframes_t roar_pcm_transfer(snd_pcm_ioplug_t *io, |
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99 | const snd_pcm_channel_area_t *areas, |
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100 | snd_pcm_uframes_t offset, |
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101 | snd_pcm_uframes_t size) { |
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102 | struct roar_alsa_pcm * self = io->private_data; |
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103 | char * buf; |
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104 | size_t len = size * self->info.channels * self->info.bits / 8; |
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105 | ssize_t ret; |
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106 | |
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107 | ROAR_DBG("roar_pcm_transfer(*) = ?"); |
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108 | ROAR_DBG("roar_pcm_transfer(*): len=%lu", (long unsigned int) len); |
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109 | |
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110 | buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8; |
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111 | |
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112 | ret = roar_vio_write(&(self->stream_vio), buf, len); |
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113 | |
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114 | if ( ret != -1 ) |
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115 | self->writec += ret; |
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116 | |
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117 | ROAR_DBG("roar_pcm_transfer(*) = %lli", (long long int)size); |
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118 | return size; |
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119 | } |
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120 | |
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121 | static int roar_pcm_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp) { |
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122 | ROAR_DBG("roar_pcm_delay(*) = ?"); |
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123 | return 0; |
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124 | } |
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125 | |
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126 | static int roar_pcm_prepare(snd_pcm_ioplug_t *io) { |
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127 | struct roar_alsa_pcm * self = io->private_data; |
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128 | |
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129 | ROAR_DBG("roar_pcm_prepare(*) = ?"); |
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130 | |
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131 | if ( self->stream_opened ) { |
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132 | roar_vio_close(&(self->stream_vio)); |
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133 | self->stream_opened = 0; |
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134 | } |
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135 | |
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136 | if ( roar_vio_simple_new_stream_obj(&(self->stream_vio), &(self->roar.con), &(self->stream), |
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137 | self->info.rate, self->info.channels, self->info.bits, self->info.codec, |
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138 | io->stream == SND_PCM_STREAM_PLAYBACK ? ROAR_DIR_PLAY : ROAR_DIR_MONITOR |
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139 | ) == -1 ) { |
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140 | return -EINVAL; |
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141 | } |
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142 | |
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143 | self->stream_opened = 1; |
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144 | |
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145 | ROAR_DBG("roar_pcm_prepare(*) = 0"); |
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146 | return 0; |
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147 | } |
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148 | |
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149 | static int roar_pcm_hw_params(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params) { |
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150 | struct roar_alsa_pcm * self = io->private_data; |
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151 | |
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152 | ROAR_DBG("roar_pcm_hw_params(*) = ?"); |
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153 | |
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154 | self->info.channels = io->channels; |
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155 | self->info.rate = io->rate; |
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156 | |
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157 | switch (io->format) { |
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158 | case SND_PCM_FORMAT_U8: |
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159 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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160 | self->info.bits = 8; |
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161 | break; |
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162 | case SND_PCM_FORMAT_A_LAW: |
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163 | self->info.codec = ROAR_CODEC_ALAW; |
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164 | self->info.bits = 8; |
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165 | break; |
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166 | case SND_PCM_FORMAT_MU_LAW: |
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167 | self->info.codec = ROAR_CODEC_MULAW; |
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168 | self->info.bits = 8; |
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169 | break; |
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170 | case SND_PCM_FORMAT_S16_LE: |
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171 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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172 | self->info.bits = 16; |
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173 | break; |
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174 | case SND_PCM_FORMAT_S16_BE: |
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175 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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176 | self->info.bits = 16; |
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177 | break; |
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178 | default: |
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179 | return-EINVAL; |
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180 | } |
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181 | |
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182 | ROAR_DBG("roar_pcm_hw_params(*) = 0"); |
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183 | return 0; |
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184 | } |
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185 | |
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186 | static int roar_pcm_close (snd_pcm_ioplug_t * io) { |
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187 | struct roar_alsa_pcm * self = io->private_data; |
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188 | |
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189 | ROAR_DBG("roar_pcm_close(*) = ?"); |
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190 | |
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191 | roar_disconnect(&(self->roar.con)); |
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192 | |
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193 | free(self); |
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194 | |
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195 | return 0; |
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196 | } |
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197 | |
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198 | static snd_pcm_ioplug_callback_t roar_pcm_callback = { |
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199 | .start = roar_pcm_dummy, |
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200 | .stop = roar_pcm_dummy, |
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201 | .drain = roar_pcm_dummy, |
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202 | .pointer = roar_pcm_pointer, |
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203 | .transfer = roar_pcm_transfer, |
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204 | .delay = roar_pcm_delay, |
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205 | .poll_descriptors_count = NULL, |
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206 | .poll_descriptors = NULL, |
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207 | .poll_revents = NULL, |
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208 | .prepare = roar_pcm_prepare, |
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209 | .hw_params = roar_pcm_hw_params, |
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210 | .hw_free = NULL, |
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211 | .sw_params = NULL, |
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212 | .pause = NULL, |
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213 | .resume = NULL, |
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214 | .dump = NULL, |
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215 | .close = roar_pcm_close, |
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216 | }; |
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217 | |
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218 | SND_PCM_PLUGIN_DEFINE_FUNC(roar) { |
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219 | struct roar_alsa_pcm * self; |
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220 | snd_config_iterator_t i, next; |
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221 | snd_config_t * n; |
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222 | const char * para; |
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223 | const char * server = NULL; |
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224 | int ret; |
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225 | |
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226 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = ?"); |
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227 | |
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228 | snd_config_for_each(i, next, conf) { |
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229 | n = snd_config_iterator_entry(i); |
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230 | if ( snd_config_get_id(n, ¶) < 0 ) |
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231 | continue; |
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232 | |
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233 | if ( !strcmp(para, "type") || !strcmp(para, "comment") ) |
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234 | continue; |
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235 | |
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236 | if ( !strcmp(para, "server") ) { |
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237 | if (snd_config_get_string(n, &server) < 0) { |
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238 | return -EINVAL; |
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239 | } |
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240 | } else { |
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241 | return -EINVAL; |
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242 | } |
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243 | } |
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244 | |
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245 | errno = ENOSYS; |
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246 | |
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247 | if ( (self = malloc(sizeof(struct roar_alsa_pcm))) == NULL ) |
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248 | return -errno; |
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249 | |
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250 | memset(self, 0, sizeof(struct roar_alsa_pcm)); |
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251 | |
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252 | errno = ENOSYS; |
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253 | if ( roar_simple_connect(&(self->roar.con), (char*)server, "ALSA Plugin") == -1 ) { |
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254 | free(self); |
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255 | return -errno; |
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256 | } |
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257 | |
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258 | self->io.version = SND_PCM_IOPLUG_VERSION; |
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259 | self->io.name = "RoarAudio Plugin"; |
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260 | self->io.poll_fd = -1; |
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261 | self->io.poll_events = 0; |
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262 | self->io.mmap_rw = 0; |
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263 | self->io.callback = &roar_pcm_callback; |
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264 | self->io.private_data = self; |
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265 | |
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266 | if ( (ret = snd_pcm_ioplug_create(&(self->io), name, stream, mode)) < 0 ) { |
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267 | roar_disconnect(&(self->roar.con)); |
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268 | free(self); |
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269 | return ret; |
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270 | } |
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271 | |
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272 | if ( (ret = roar_hw_constraint(self)) < 0 ) { |
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273 | snd_pcm_ioplug_delete(&(self->io)); |
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274 | roar_disconnect(&(self->roar.con)); |
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275 | free(self); |
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276 | return ret; |
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277 | } |
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278 | |
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279 | *pcmp = self->io.pcm; |
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280 | |
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281 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = 0"); |
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282 | |
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283 | return 0; |
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284 | } |
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285 | |
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286 | SND_PCM_PLUGIN_SYMBOL(roar); |
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287 | |
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288 | int __snd_pcm_roar_open_dlsym_pcm_001 (void) { |
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289 | ROAR_DBG("__snd_pcm_roar_open_dlsym_pcm_001(void) = 0"); |
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290 | return 0; |
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291 | } |
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292 | |
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293 | //ll |
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