1 | //driver_alsa.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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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 roard 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 | * RoarAudio 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 | */ |
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26 | |
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27 | #include "roard.h" |
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28 | |
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29 | #ifdef ROAR_HAVE_LIBASOUND |
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30 | |
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31 | #define ALSA_PCM_NEW_HW_PARAMS_API |
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32 | |
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33 | static snd_pcm_format_t driver_alsa_roar_fmt_to_alsa(struct roar_audio_info * info) { |
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34 | snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN; |
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35 | |
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36 | switch (info->codec) { |
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37 | case ROAR_CODEC_PCM_S_LE: |
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38 | switch (info->bits) { |
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39 | case 8: format = SND_PCM_FORMAT_S8; break; |
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40 | case 16: format = SND_PCM_FORMAT_S16_LE; break; |
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41 | case 24: format = SND_PCM_FORMAT_S24_3LE; break; |
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42 | case 32: format = SND_PCM_FORMAT_S32_LE; break; |
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43 | } |
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44 | break; |
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45 | case ROAR_CODEC_PCM_S_BE: |
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46 | switch (info->bits) { |
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47 | case 8: format = SND_PCM_FORMAT_S8; break; |
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48 | case 16: format = SND_PCM_FORMAT_S16_BE; break; |
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49 | case 24: format = SND_PCM_FORMAT_S24_3BE; break; |
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50 | case 32: format = SND_PCM_FORMAT_S32_BE; break; |
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51 | } |
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52 | break; |
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53 | case ROAR_CODEC_PCM_U_LE: |
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54 | switch (info->bits) { |
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55 | case 8: format = SND_PCM_FORMAT_U8; break; |
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56 | case 16: format = SND_PCM_FORMAT_U16_LE; break; |
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57 | case 24: format = SND_PCM_FORMAT_U24_3LE; break; |
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58 | case 32: format = SND_PCM_FORMAT_U32_LE; break; |
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59 | } |
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60 | break; |
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61 | case ROAR_CODEC_PCM_U_BE: |
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62 | switch (info->bits) { |
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63 | case 8: format = SND_PCM_FORMAT_U8; break; |
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64 | case 16: format = SND_PCM_FORMAT_U16_BE; break; |
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65 | case 24: format = SND_PCM_FORMAT_U24_3BE; break; |
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66 | case 32: format = SND_PCM_FORMAT_U32_BE; break; |
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67 | } |
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68 | break; |
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69 | case ROAR_CODEC_ALAW: |
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70 | format = SND_PCM_FORMAT_A_LAW; |
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71 | break; |
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72 | case ROAR_CODEC_MULAW: |
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73 | format = SND_PCM_FORMAT_MU_LAW; |
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74 | break; |
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75 | case ROAR_CODEC_GSM: |
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76 | format = SND_PCM_FORMAT_GSM; |
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77 | break; |
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78 | } |
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79 | |
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80 | return format; |
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81 | } |
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82 | |
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83 | static int driver_alsa_set_params(roar_alsa_t * device) { |
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84 | unsigned int buffer_time = 32000; // 32ms buffer if possible. |
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85 | // *_buffer_time_near() will pick something as close as possible. |
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86 | snd_pcm_uframes_t frames = ROAR_OUTPUT_BUFFER_SAMPLES; |
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87 | int rc; |
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88 | |
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89 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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90 | |
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91 | if ( snd_pcm_hw_params_malloc(&device->params) < 0 ) |
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92 | return -1; |
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93 | |
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94 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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95 | |
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96 | if ( snd_pcm_hw_params_any(device->handle, device->params) < 0 ) |
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97 | goto error; |
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98 | |
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99 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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100 | |
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101 | if ( snd_pcm_hw_params_set_access(device->handle, device->params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ) |
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102 | goto error; |
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103 | |
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104 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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105 | |
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106 | if ( snd_pcm_hw_params_set_format(device->handle, device->params, device->format) < 0) |
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107 | goto error; |
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108 | |
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109 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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110 | |
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111 | ROAR_DBG("driver_alsa_set_params(device=%p): device->info.channels=%i", device, device->info.channels); |
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112 | |
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113 | if ( snd_pcm_hw_params_set_channels(device->handle, device->params, device->info.channels) < 0 ) |
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114 | goto error; |
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115 | |
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116 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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117 | |
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118 | if ( snd_pcm_hw_params_set_rate(device->handle, device->params, device->info.rate, 0) < 0 ) |
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119 | goto error; |
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120 | |
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121 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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122 | |
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123 | if ( snd_pcm_hw_params_set_buffer_time_near(device->handle, device->params, &buffer_time, NULL) < 0 ) |
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124 | goto error; |
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125 | |
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126 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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127 | |
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128 | if ( snd_pcm_hw_params_set_period_size_near(device->handle, device->params, &frames, NULL) < 0 ) |
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129 | goto error; |
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130 | |
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131 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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132 | |
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133 | rc = snd_pcm_hw_params(device->handle, device->params); |
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134 | if (rc < 0) { |
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135 | ROAR_ERR("driver_alsa_open_vio(*): unable to set hw parameters: %s", snd_strerror(rc)); |
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136 | goto error; |
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137 | } |
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138 | |
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139 | ROAR_DBG("driver_alsa_set_params(device=%p) = ?", device); |
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140 | |
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141 | snd_pcm_hw_params_free(device->params); |
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142 | |
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143 | ROAR_DBG("driver_alsa_set_params(device=%p) = 0", device); |
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144 | |
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145 | return 0; |
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146 | |
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147 | error: |
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148 | snd_pcm_hw_params_free(device->params); |
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149 | ROAR_DBG("driver_alsa_set_params(device=%p) = -1", device); |
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150 | return -1; |
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151 | } |
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152 | |
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153 | int driver_alsa_open_vio(struct roar_vio_calls * inst, char * device, struct roar_audio_info * info, int fh, struct roar_stream_server * sstream) { |
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154 | roar_alsa_t * interface; |
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155 | char * alsa_dev; |
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156 | int rc; |
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157 | int autoconf; |
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158 | |
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159 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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160 | |
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161 | if ( fh != -1 ) |
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162 | return -1; |
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163 | |
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164 | if ( (interface = roar_mm_calloc(1, sizeof(roar_alsa_t))) == NULL ) |
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165 | return -1; |
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166 | |
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167 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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168 | |
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169 | if ( device == NULL ) { |
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170 | alsa_dev = "default"; |
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171 | } else { |
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172 | alsa_dev = device; |
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173 | } |
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174 | |
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175 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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176 | |
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177 | rc = snd_pcm_open(&(interface->handle), alsa_dev, SND_PCM_STREAM_PLAYBACK, 0); |
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178 | if ( rc < 0 ) { |
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179 | ROAR_ERR("driver_alsa_open_vio(*): Unable to open PCM device: %s", snd_strerror(rc)); |
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180 | roar_mm_free(interface); |
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181 | return -1; |
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182 | } |
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183 | |
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184 | // Setting sample format, yay. |
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185 | interface->format = driver_alsa_roar_fmt_to_alsa(info); |
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186 | |
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187 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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188 | |
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189 | // We did not find a codec |
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190 | if ( interface->format == SND_PCM_FORMAT_UNKNOWN ) { |
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191 | autoconf = streams_get_flag(ROAR_STREAM(sstream)->id, ROAR_FLAG_AUTOCONF); |
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192 | if ( autoconf == -1 ) { |
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193 | ROAR_ERR("driver_alsa_open_vio(*): Could not get autoconf flag."); |
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194 | goto init_error; |
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195 | } |
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196 | |
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197 | if ( autoconf ) { |
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198 | info->bits = 16; |
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199 | |
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200 | #if ROAR_CODEC_DEFAULT == ROAR_CODEC_PCM_S_LE |
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201 | interface->format = SND_PCM_FORMAT_S16_LE; |
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202 | info->codec = ROAR_CODEC_PCM_S_LE; |
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203 | #elif ROAR_CODEC_DEFAULT == ROAR_CODEC_PCM_S_BE |
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204 | interface->format = SND_PCM_FORMAT_S16_BE; |
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205 | info->codec = ROAR_CODEC_PCM_S_BE; |
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206 | #else |
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207 | ROAR_ERR("driver_alsa_open_vio(*): ALSA only support little- or big-endian sample format. Please select -oO codec=pcm_s_le or pcm_s_be"); |
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208 | goto init_error; |
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209 | #endif |
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210 | ROAR_WARN("driver_alsa_open_vio(*): Supplied codec type not available. Using 16 bit sample format."); |
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211 | } else { |
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212 | ROAR_ERR("driver_alsa_open_vio(*): can not set requested codec, set codec manually with -oO codec=<codec>."); |
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213 | goto init_error; |
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214 | } |
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215 | } |
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216 | |
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217 | memcpy(&(interface->info), info, sizeof(struct roar_audio_info)); |
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218 | |
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219 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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220 | |
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221 | if ( driver_alsa_set_params(interface) < 0 ) |
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222 | goto init_error; |
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223 | |
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224 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = ?", inst, device, info, fh, sstream); |
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225 | |
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226 | memset(inst, 0, sizeof(struct roar_vio_calls)); |
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227 | |
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228 | inst->inst = (void*) interface; |
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229 | inst->write = driver_alsa_write; |
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230 | inst->close = driver_alsa_close; |
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231 | inst->sync = driver_alsa_sync; |
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232 | inst->ctl = driver_alsa_ctl; |
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233 | inst->nonblock = driver_dummy_nonblock; |
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234 | |
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235 | ROAR_DBG("driver_alsa_open_vio(inst=%p, device='%s', info=%p, fh=%i, sstream=%p) = 0", inst, device, info, fh, sstream); |
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236 | |
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237 | return 0; |
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238 | |
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239 | init_error: |
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240 | snd_pcm_close(interface->handle); |
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241 | roar_mm_free(interface); |
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242 | return -1; |
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243 | } |
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244 | |
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245 | int driver_alsa_close(struct roar_vio_calls * vio) { |
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246 | roar_alsa_t * device = vio->inst; |
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247 | |
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248 | if ( device->handle != NULL ) { |
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249 | snd_pcm_drain(device->handle); |
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250 | snd_pcm_close(device->handle); |
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251 | } |
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252 | |
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253 | roar_mm_free(device); |
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254 | |
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255 | return 0; |
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256 | } |
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257 | |
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258 | static ssize_t driver_alsa_write_int(struct roar_vio_calls * vio, void *buf, size_t size) { |
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259 | roar_alsa_t * device = vio->inst; |
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260 | snd_pcm_sframes_t write_size = snd_pcm_bytes_to_frames(device->handle, size); |
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261 | snd_pcm_sframes_t rc; |
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262 | |
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263 | ROAR_DBG("driver_alsa_write(vio=%p, buf=%p, size=%llu) = ?", vio, buf, (long long unsigned int)size); |
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264 | |
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265 | rc = snd_pcm_writei(device->handle, buf, write_size); |
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266 | |
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267 | if ( rc == -EPIPE || rc == -EINTR || rc == -ESTRPIPE ) { |
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268 | if ( snd_pcm_recover(device->handle, rc, 1) < 0 ) |
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269 | return -1; |
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270 | return size; |
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271 | } else if (rc < 0) { |
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272 | ROAR_ERR("driver_alsa_write(*): Error from snd_pcm_writei(*): %s", snd_strerror(rc)); |
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273 | return -1; |
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274 | } |
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275 | |
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276 | return snd_pcm_frames_to_bytes(device->handle, rc); |
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277 | } |
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278 | |
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279 | ssize_t driver_alsa_write(struct roar_vio_calls * vio, void *buf, size_t size) { |
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280 | char* mutable_buf = (char*)buf; |
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281 | ssize_t have = 0; |
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282 | ssize_t ret; |
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283 | |
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284 | while (size) { |
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285 | ret = driver_alsa_write_int(vio, mutable_buf, size); |
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286 | if ( ret < 0 ) |
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287 | return -1; |
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288 | |
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289 | have += ret; |
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290 | mutable_buf += ret; |
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291 | size -= ret; |
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292 | } |
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293 | |
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294 | return have; |
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295 | } |
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296 | |
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297 | int driver_alsa_sync(struct roar_vio_calls * vio) { |
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298 | roar_alsa_t * device = vio->inst; |
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299 | return snd_pcm_drain(device->handle); |
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300 | } |
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301 | |
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302 | /* Stop the driver, set new params, and restart */ |
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303 | /* Not been able to test this function. */ |
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304 | /* Assuming that params can be reset after halting the PCM device */ |
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305 | static int driver_alsa_reopen_device(roar_alsa_t * device) { |
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306 | |
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307 | if ( snd_pcm_drop(device->handle) < 0 ) { |
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308 | ROAR_ERR("driver_alsa_reopen_device(*): snd_pcm_drop() failed."); |
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309 | return -1; |
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310 | } |
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311 | |
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312 | if ( driver_alsa_set_params(device) < 0 ) { |
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313 | ROAR_ERR("driver_alsa_reopen_device(*): driver_alsa_set_params() failed."); |
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314 | return -1; |
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315 | } |
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316 | |
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317 | return 0; |
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318 | } |
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319 | |
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320 | /* Not completely tested. |
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321 | * Tested: |
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322 | * ROAR_VIO_CTL_GET_DELAY |
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323 | * ROAR_VIO_CTL_SET_SSTREAMID |
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324 | * ROAR_VIO_CTL_SET_SSTREAM |
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325 | */ |
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326 | |
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327 | int driver_alsa_ctl(struct roar_vio_calls * vio, int cmd, void * data) { |
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328 | roar_alsa_t * device = vio->inst; |
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329 | snd_pcm_sframes_t alsa_delay; |
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330 | |
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331 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=0x%.8x, data=%p) = ?", vio, cmd, data); |
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332 | |
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333 | switch (cmd) { |
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334 | case ROAR_VIO_CTL_GET_DELAY: |
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335 | if ( snd_pcm_delay(device->handle, &alsa_delay) < 0 ) |
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336 | return -1; |
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337 | else { |
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338 | *(uint_least32_t *)data = snd_pcm_frames_to_bytes(device->handle, alsa_delay); |
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339 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=ROAR_VIO_CTL_GET_DELAY(0x%.8x), data=%p): %i bytes.", vio, cmd, data, (int)(*(uint_least32_t*)data)); |
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340 | } |
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341 | break; |
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342 | |
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343 | case ROAR_VIO_CTL_SET_SSTREAMID: |
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344 | device->ssid = *(int *)data; |
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345 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=ROAR_VIO_CTL_SET_SSTREAMID(0x%.8x), data=%p): ssid=%i", vio, cmd, data, device->ssid); |
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346 | break; |
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347 | |
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348 | case ROAR_VIO_CTL_SET_SSTREAM: |
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349 | device->sstream = data; |
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350 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=ROAR_VIO_CTL_SET_SSTREAM(0x%.8x), data=%p): sstream=%p", vio, cmd, data, device->sstream); |
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351 | break; |
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352 | |
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353 | case ROAR_VIO_CTL_GET_AUINFO: |
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354 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=ROAR_VIO_CTL_GET_AUINFO(0x%.8x), data=%p) = ?", vio, cmd, data); |
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355 | memcpy(data, &(device->info), sizeof(struct roar_audio_info)); |
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356 | break; |
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357 | |
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358 | case ROAR_VIO_CTL_SET_AUINFO: |
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359 | ROAR_DBG("driver_alsa_ctl(vio=%p, cmd=ROAR_VIO_CTL_SET_AUINFO(0x%.8x), data=%p) = ?", vio, cmd, data); |
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360 | memcpy(&(device->info), data, sizeof(struct roar_audio_info)); |
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361 | return driver_alsa_reopen_device(device); |
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362 | |
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363 | default: |
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364 | return -1; |
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365 | } |
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366 | |
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367 | return 0; |
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368 | } |
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369 | |
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370 | #endif |
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371 | |
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