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 - 2010-2011 |
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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 | */ |
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31 | |
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32 | #include "roar.h" |
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33 | |
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34 | // Equvivalent to prepare(). Starts a stream. Also needs to reset the writec since pointer() will do funny |
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35 | // things without it. Will be called several times during a program! |
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36 | static int roar_pcm_start (snd_pcm_ioplug_t * io) { |
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37 | struct roar_alsa_pcm * self = io->private_data; |
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38 | int fh; |
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39 | |
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40 | ROAR_DBG("roar_pcm_start(*) = ?"); |
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41 | |
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42 | // If start is called several times in a row, just ignore it. |
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43 | if (self->stream_opened) |
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44 | return 0; |
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45 | |
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46 | if ( roar_vio_simple_new_stream_obj(&(self->stream_vio), &(self->roar.con), &(self->stream), |
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47 | self->info.rate, self->info.channels, self->info.bits, self->info.codec, |
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48 | io->stream == SND_PCM_STREAM_PLAYBACK ? ROAR_DIR_PLAY : ROAR_DIR_MONITOR |
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49 | ) == -1 ) { |
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50 | return -EINVAL; |
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51 | } |
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52 | |
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53 | if ( roar_vio_ctl(&(self->stream_vio), io->stream == SND_PCM_STREAM_PLAYBACK ? |
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54 | ROAR_VIO_CTL_GET_SELECT_WRITE_FH : ROAR_VIO_CTL_GET_SELECT_READ_FH, |
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55 | &fh) != -1 ) { |
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56 | |
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57 | io->poll_fd = fh; |
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58 | io->poll_events = io->stream == SND_PCM_STREAM_PLAYBACK ? POLLOUT : POLLIN; |
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59 | |
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60 | snd_pcm_ioplug_reinit_status(io); |
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61 | } |
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62 | |
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63 | // Stream is now active, yay. |
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64 | self->stream_opened = 1; |
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65 | self->writec = 0; |
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66 | |
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67 | return 0; |
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68 | } |
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69 | |
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70 | // Simply stopping the stream. Will need to be restarted to play more. |
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71 | // Will be called several times together with roar_pcm_start() |
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72 | static int roar_pcm_stop (snd_pcm_ioplug_t *io) { |
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73 | struct roar_alsa_pcm * self = io->private_data; |
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74 | |
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75 | ROAR_DBG("roar_pcm_stop(*) = ?"); |
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76 | |
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77 | // If this is called several times in a row, just ignore. |
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78 | if ( !self->stream_opened ) |
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79 | return 0; |
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80 | |
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81 | roar_vio_close(&(self->stream_vio)); |
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82 | self->stream_opened = 0; |
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83 | |
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84 | ROAR_DBG("roar_pcm_stop(*) = 0"); |
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85 | |
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86 | return 0; |
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87 | } |
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88 | |
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89 | static int roar_hw_constraint(struct roar_alsa_pcm * self) { |
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90 | snd_pcm_ioplug_t *io = &(self->io); |
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91 | static const snd_pcm_access_t access_list[] = { |
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92 | SND_PCM_ACCESS_RW_INTERLEAVED |
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93 | }; |
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94 | static const unsigned int formats[] = { |
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95 | SND_PCM_FORMAT_S8, |
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96 | SND_PCM_FORMAT_U8, |
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97 | SND_PCM_FORMAT_A_LAW, |
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98 | SND_PCM_FORMAT_MU_LAW, |
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99 | SND_PCM_FORMAT_S16_LE, |
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100 | SND_PCM_FORMAT_S16_BE, |
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101 | SND_PCM_FORMAT_U16_LE, |
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102 | SND_PCM_FORMAT_U16_BE, |
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103 | SND_PCM_FORMAT_S32_LE, |
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104 | SND_PCM_FORMAT_S32_BE, |
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105 | SND_PCM_FORMAT_U32_LE, |
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106 | SND_PCM_FORMAT_U32_BE, |
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107 | SND_PCM_FORMAT_S24_3LE, |
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108 | SND_PCM_FORMAT_S24_3BE, |
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109 | SND_PCM_FORMAT_U24_3LE, |
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110 | SND_PCM_FORMAT_U24_3BE, |
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111 | }; |
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112 | int ret; |
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113 | |
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114 | ROAR_DBG("roar_hw_constraint(*) = ?"); |
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115 | |
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116 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_ACCESS, |
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117 | _as(access_list), access_list)) < 0 ) |
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118 | return ret; |
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119 | |
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120 | if ( (ret = snd_pcm_ioplug_set_param_list(io, SND_PCM_IOPLUG_HW_FORMAT, |
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121 | _as(formats), formats)) < 0 ) |
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122 | return ret; |
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123 | |
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124 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_CHANNELS, |
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125 | 1, ROAR_MAX_CHANNELS)) < 0 ) |
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126 | return ret; |
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127 | |
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128 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_RATE, 8000, 192000)) < 0 ) |
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129 | return ret; |
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130 | |
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131 | #if 0 |
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132 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, 1, 4294967295U)) < 0 ) |
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133 | return ret; |
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134 | |
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135 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIODS, 1, 4294967295U)) < 0 ) |
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136 | return ret; |
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137 | |
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138 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES, 1, 4294967295U)) < 0 ) |
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139 | return ret; |
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140 | #else |
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141 | // We shouldn't let ALSA use extremely low or high values, it will kill a kitty most likely. :v |
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142 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, 1 << 6, 1 << 18)) < 0 ) |
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143 | return ret; |
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144 | |
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145 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_PERIODS, 1, 1024)) < 0 ) |
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146 | return ret; |
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147 | |
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148 | if ( (ret = snd_pcm_ioplug_set_param_minmax(io, SND_PCM_IOPLUG_HW_BUFFER_BYTES, 1 << 13, 1 << 24)) < 0 ) |
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149 | return ret; |
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150 | #endif |
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151 | |
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152 | ROAR_DBG("roar_hw_constraint(*) = 0"); |
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153 | |
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154 | return 0; |
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155 | } |
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156 | |
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157 | |
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158 | /////////////////////////////// |
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159 | /// TODO: Needs to be implemented |
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160 | /////////////////////////////// |
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161 | // This hacky hack should not be used, since apparently, using this, ALSA will think the audio buffer is always empty (?), |
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162 | // leading to completely broken blocking audio which will only work with audio players. |
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163 | // Will need a method to determine how much buffer data is available to write to the roar buffer without blocking. |
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164 | // We therefore also need to know the buffersize that ALSA uses. |
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165 | |
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166 | // Referring to alsa-lib/src/pcm/pcm_ioplug.c : snd_pcm_ioplug_hw_ptr_update |
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167 | static snd_pcm_sframes_t roar_pcm_pointer(snd_pcm_ioplug_t *io) { |
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168 | struct roar_alsa_pcm * self = io->private_data; |
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169 | |
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170 | ROAR_DBG("roar_pcm_pointer(*) = ?"); |
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171 | |
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172 | return snd_pcm_bytes_to_frames(io->pcm, self->writec); |
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173 | } |
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174 | |
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175 | // TODO: FIXME: add support for reading data! |
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176 | static snd_pcm_sframes_t roar_pcm_transfer(snd_pcm_ioplug_t *io, |
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177 | const snd_pcm_channel_area_t *areas, |
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178 | snd_pcm_uframes_t offset, |
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179 | snd_pcm_uframes_t size) { |
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180 | struct roar_alsa_pcm * self = io->private_data; |
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181 | char * buf; |
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182 | size_t len = size * self->info.channels * self->info.bits / 8; |
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183 | ssize_t ret; |
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184 | |
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185 | ROAR_DBG("roar_pcm_transfer(*) = ?"); |
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186 | ROAR_DBG("roar_pcm_transfer(*): len=%lu", (long unsigned int) len); |
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187 | |
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188 | // Weird ALSA stuff. |
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189 | buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8; |
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190 | |
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191 | ret = roar_vio_write(&(self->stream_vio), buf, len); |
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192 | |
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193 | if ( ret != -1 ) { |
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194 | // We increment the written counter so that subsequent calls to pointer() will not cause |
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195 | // the library to hang due to several quirks that ALSA uses to determine available size. |
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196 | // This approach is bad, but is needed until pointer() is implemented correctly. |
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197 | self->writec += ret; |
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198 | } else { |
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199 | return -EIO; |
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200 | } |
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201 | |
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202 | ROAR_DBG("roar_pcm_transfer(*) = %lli", (long long int)size); |
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203 | return size; |
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204 | } |
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205 | |
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206 | |
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207 | /////////////////////////////// |
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208 | /// TODO: Needs to be implemented |
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209 | /////////////////////////////// |
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210 | static int roar_pcm_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp) { |
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211 | (void)io; |
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212 | |
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213 | ROAR_DBG("roar_pcm_delay(*) = ?"); |
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214 | |
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215 | // TODO: We need to set *delayp the latency in frames. |
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216 | *delayp = 0; |
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217 | |
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218 | return 0; |
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219 | } |
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220 | |
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221 | static int roar_pcm_prepare(snd_pcm_ioplug_t *io) { |
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222 | ROAR_DBG("roar_pcm_prepare(*) = ?"); |
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223 | |
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224 | return roar_pcm_start(io); |
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225 | } |
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226 | |
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227 | static int roar_pcm_hw_params(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params) { |
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228 | struct roar_alsa_pcm * self = io->private_data; |
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229 | |
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230 | (void) params; |
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231 | |
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232 | ROAR_DBG("roar_pcm_hw_params(*) = ?"); |
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233 | |
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234 | self->info.channels = io->channels; |
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235 | self->info.rate = io->rate; |
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236 | |
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237 | switch (io->format) { |
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238 | case SND_PCM_FORMAT_S8: |
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239 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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240 | self->info.bits = 8; |
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241 | break; |
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242 | case SND_PCM_FORMAT_U8: |
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243 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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244 | self->info.bits = 8; |
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245 | break; |
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246 | case SND_PCM_FORMAT_A_LAW: |
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247 | self->info.codec = ROAR_CODEC_ALAW; |
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248 | self->info.bits = 8; |
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249 | break; |
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250 | case SND_PCM_FORMAT_MU_LAW: |
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251 | self->info.codec = ROAR_CODEC_MULAW; |
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252 | self->info.bits = 8; |
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253 | break; |
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254 | case SND_PCM_FORMAT_S16_LE: |
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255 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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256 | self->info.bits = 16; |
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257 | break; |
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258 | case SND_PCM_FORMAT_S16_BE: |
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259 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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260 | self->info.bits = 16; |
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261 | break; |
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262 | case SND_PCM_FORMAT_U16_LE: |
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263 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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264 | self->info.bits = 16; |
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265 | break; |
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266 | case SND_PCM_FORMAT_U16_BE: |
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267 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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268 | self->info.bits = 16; |
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269 | break; |
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270 | case SND_PCM_FORMAT_S32_LE: |
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271 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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272 | self->info.bits = 32; |
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273 | break; |
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274 | case SND_PCM_FORMAT_S32_BE: |
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275 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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276 | self->info.bits = 32; |
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277 | break; |
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278 | case SND_PCM_FORMAT_U32_LE: |
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279 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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280 | self->info.bits = 32; |
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281 | break; |
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282 | case SND_PCM_FORMAT_U32_BE: |
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283 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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284 | self->info.bits = 32; |
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285 | break; |
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286 | case SND_PCM_FORMAT_S24_3LE: |
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287 | self->info.codec = ROAR_CODEC_PCM_S_LE; |
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288 | self->info.bits = 24; |
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289 | break; |
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290 | case SND_PCM_FORMAT_S24_3BE: |
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291 | self->info.codec = ROAR_CODEC_PCM_S_BE; |
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292 | self->info.bits = 24; |
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293 | break; |
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294 | case SND_PCM_FORMAT_U24_3LE: |
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295 | self->info.codec = ROAR_CODEC_PCM_U_LE; |
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296 | self->info.bits = 24; |
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297 | break; |
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298 | case SND_PCM_FORMAT_U24_3BE: |
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299 | self->info.codec = ROAR_CODEC_PCM_U_BE; |
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300 | self->info.bits = 24; |
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301 | break; |
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302 | default: |
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303 | return-EINVAL; |
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304 | } |
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305 | |
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306 | ROAR_DBG("roar_pcm_hw_params(*) = 0"); |
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307 | return 0; |
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308 | } |
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309 | |
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310 | static int roar_pcm_close (snd_pcm_ioplug_t * io) { |
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311 | struct roar_alsa_pcm * self = io->private_data; |
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312 | |
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313 | ROAR_DBG("roar_pcm_close(*) = ?"); |
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314 | |
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315 | roar_disconnect(&(self->roar.con)); |
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316 | |
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317 | roar_mm_free(self); |
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318 | |
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319 | return 0; |
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320 | } |
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321 | |
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322 | static snd_pcm_ioplug_callback_t roar_pcm_callback = { |
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323 | .start = roar_pcm_start, |
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324 | .stop = roar_pcm_stop, |
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325 | .drain = NULL, |
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326 | .pointer = roar_pcm_pointer, |
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327 | .transfer = roar_pcm_transfer, |
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328 | .delay = roar_pcm_delay, |
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329 | .poll_descriptors_count = NULL, |
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330 | .poll_descriptors = NULL, |
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331 | .poll_revents = NULL, |
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332 | .prepare = roar_pcm_prepare, |
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333 | .hw_params = roar_pcm_hw_params, |
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334 | .hw_free = NULL, |
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335 | .sw_params = NULL, |
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336 | .pause = NULL, |
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337 | .resume = NULL, |
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338 | .dump = NULL, |
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339 | .close = roar_pcm_close, |
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340 | }; |
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341 | |
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342 | SND_PCM_PLUGIN_DEFINE_FUNC(roar) { |
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343 | struct roar_alsa_pcm * self; |
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344 | snd_config_iterator_t i, next; |
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345 | snd_config_t * n; |
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346 | const char * para; |
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347 | const char * server = NULL; |
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348 | int ret; |
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349 | |
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350 | (void)root; |
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351 | |
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352 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = ?"); |
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353 | |
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354 | snd_config_for_each(i, next, conf) { |
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355 | n = snd_config_iterator_entry(i); |
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356 | if ( snd_config_get_id(n, ¶) < 0 ) |
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357 | continue; |
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358 | |
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359 | if ( !strcmp(para, "type") || !strcmp(para, "comment") ) |
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360 | continue; |
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361 | |
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362 | if ( !strcmp(para, "server") ) { |
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363 | if (snd_config_get_string(n, &server) < 0) { |
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364 | return -EINVAL; |
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365 | } |
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366 | } else { |
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367 | return -EINVAL; |
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368 | } |
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369 | } |
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370 | |
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371 | errno = ENOSYS; |
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372 | |
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373 | if ( (self = roar_mm_malloc(sizeof(struct roar_alsa_pcm))) == NULL ) |
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374 | return -errno; |
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375 | |
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376 | memset(self, 0, sizeof(struct roar_alsa_pcm)); |
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377 | |
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378 | errno = ENOSYS; |
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379 | if ( roar_simple_connect(&(self->roar.con), (char*)server, "ALSA Plugin") == -1 ) { |
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380 | roar_mm_free(self); |
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381 | return -errno; |
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382 | } |
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383 | |
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384 | self->io.version = SND_PCM_IOPLUG_VERSION; |
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385 | self->io.name = "RoarAudio Plugin"; |
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386 | self->io.poll_fd = -1; |
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387 | self->io.poll_events = 0; |
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388 | self->io.mmap_rw = 0; |
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389 | self->io.callback = &roar_pcm_callback; |
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390 | self->io.private_data = self; |
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391 | |
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392 | if ( (ret = snd_pcm_ioplug_create(&(self->io), name, stream, mode)) < 0 ) { |
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393 | roar_disconnect(&(self->roar.con)); |
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394 | roar_mm_free(self); |
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395 | return ret; |
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396 | } |
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397 | |
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398 | if ( (ret = roar_hw_constraint(self)) < 0 ) { |
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399 | snd_pcm_ioplug_delete(&(self->io)); |
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400 | roar_disconnect(&(self->roar.con)); |
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401 | roar_mm_free(self); |
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402 | return ret; |
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403 | } |
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404 | |
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405 | *pcmp = self->io.pcm; |
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406 | |
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407 | ROAR_DBG("SND_PCM_PLUGIN_DEFINE_FUNC(roar) = 0"); |
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408 | |
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409 | return 0; |
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410 | } |
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411 | |
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412 | SND_PCM_PLUGIN_SYMBOL(roar); |
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413 | |
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414 | int __snd_pcm_roar_open_dlsym_pcm_001 (void) { |
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415 | ROAR_DBG("__snd_pcm_roar_open_dlsym_pcm_001(void) = 0"); |
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416 | return 0; |
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417 | } |
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418 | |
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419 | //ll |
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