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 - 2008-2010 |
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5 | * Copyright (C) Hans-Kristian 'maister' Arntzen - 2010 |
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6 | * |
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7 | * This file is part of 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 | typedef struct roar_alsa { |
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34 | snd_pcm_t *handle; |
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35 | snd_pcm_hw_params_t* params; |
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36 | } roar_alsa_t; |
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37 | |
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38 | 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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39 | roar_alsa_t * interface; |
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40 | char * alsa_dev; |
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41 | int rc; |
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42 | unsigned buffer_time = 200000; // 200ms buffer |
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43 | snd_pcm_uframes_t frames = ROAR_OUTPUT_BUFFER_SAMPLES; // ALSA frames |
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44 | snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN; // If this isn't set further down, we pick 16 bit audio if we're using autoconf. |
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45 | uint16_t channels = info->channels; |
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46 | uint32_t samplerate = info->rate; |
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47 | int autoconf; |
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48 | |
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49 | |
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50 | if ( fh != -1 ) |
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51 | return -1; |
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52 | |
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53 | if ( (interface = roar_mm_calloc(1, sizeof(roar_alsa_t))) == NULL ) |
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54 | return -1; |
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55 | |
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56 | if ( device == NULL ) { |
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57 | alsa_dev = "default"; |
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58 | } else { |
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59 | alsa_dev = device; |
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60 | } |
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61 | |
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62 | rc = snd_pcm_open(&(interface->handle), alsa_dev, SND_PCM_STREAM_PLAYBACK, 0); |
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63 | if ( rc < 0 ) { |
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64 | ROAR_ERR("driver_alsa_open_vio(*): Unable to open PCM device: %s", snd_strerror(rc)); |
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65 | roar_mm_free(interface); |
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66 | return -1; |
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67 | } |
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68 | |
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69 | // Setting sample format, yay. |
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70 | if ( info->codec == ROAR_CODEC_PCM_S_LE ) { |
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71 | switch (info->bits) { |
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72 | case 8: |
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73 | format = SND_PCM_FORMAT_S8; |
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74 | break; |
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75 | case 16: |
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76 | format = SND_PCM_FORMAT_S16_LE; |
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77 | break; |
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78 | case 32: |
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79 | format = SND_PCM_FORMAT_S32_LE; |
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80 | break; |
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81 | } |
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82 | } else if ( info->codec == ROAR_CODEC_PCM_U_LE ) { |
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83 | switch (info->bits) { |
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84 | case 8: |
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85 | format = SND_PCM_FORMAT_U8; |
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86 | break; |
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87 | case 16: |
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88 | format = SND_PCM_FORMAT_U16_LE; |
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89 | break; |
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90 | case 32: |
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91 | format = SND_PCM_FORMAT_U32_LE; |
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92 | break; |
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93 | } |
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94 | } else if ( info->codec == ROAR_CODEC_PCM_S_BE ) { |
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95 | switch (info->bits) { |
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96 | case 8: |
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97 | format = SND_PCM_FORMAT_S8; |
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98 | break; |
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99 | case 16: |
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100 | format = SND_PCM_FORMAT_S16_BE; |
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101 | break; |
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102 | case 32: |
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103 | format = SND_PCM_FORMAT_S32_BE; |
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104 | break; |
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105 | } |
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106 | } else if ( info->codec == ROAR_CODEC_PCM_U_BE ) { |
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107 | switch (info->bits) { |
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108 | case 8: |
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109 | format = SND_PCM_FORMAT_U8; |
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110 | break; |
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111 | case 16: |
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112 | format = SND_PCM_FORMAT_U16_BE; |
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113 | break; |
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114 | case 32: |
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115 | format = SND_PCM_FORMAT_U32_BE; |
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116 | break; |
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117 | } |
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118 | } |
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119 | |
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120 | // We did not find a codec |
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121 | if ( format == SND_PCM_FORMAT_UNKNOWN ) { |
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122 | autoconf = streams_get_flag(ROAR_STREAM(sstream)->id, ROAR_FLAG_AUTOCONF); |
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123 | if ( autoconf == -1 ) { |
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124 | ROAR_ERR("driver_alsa_open_vio(*): Could not get autoconf flag."); |
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125 | goto init_error; |
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126 | } |
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127 | |
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128 | if ( autoconf ) { |
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129 | info->bits = 16; |
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130 | |
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131 | #if ROAR_CODEC_DEFAULT == ROAR_CODEC_PCM_S_LE |
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132 | format = SND_PCM_FORMAT_S16_LE; |
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133 | info->codec = ROAR_CODEC_PCM_S_LE; |
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134 | #elif ROAR_CODEC_DEFAULT == ROAR_CODEC_PCM_S_BE |
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135 | format = SND_PCM_FORMAT_S16_BE; |
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136 | info->codec = ROAR_CODEC_PCM_S_BE; |
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137 | #else |
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138 | 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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139 | goto init_error; |
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140 | #endif |
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141 | ROAR_WARN("driver_alsa_open_vio(*): Supplied codec type not available. Using 16 bit sample format."); |
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142 | } else { |
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143 | ROAR_ERR("driver_alsa_open_vio(*): can not set requested codec, set codec manually with -oO codec=<codec>."); |
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144 | goto init_error; |
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145 | } |
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146 | } |
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147 | |
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148 | |
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149 | if ( snd_pcm_hw_params_malloc(&interface->params) < 0 ) |
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150 | goto init_error; |
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151 | |
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152 | if ( snd_pcm_hw_params_any(interface->handle, interface->params) < 0 ) |
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153 | goto init_error; |
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154 | if ( snd_pcm_hw_params_set_access(interface->handle, interface->params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ) |
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155 | goto init_error; |
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156 | if ( snd_pcm_hw_params_set_format(interface->handle, interface->params, format) < 0) |
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157 | goto init_error; |
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158 | if ( snd_pcm_hw_params_set_channels(interface->handle, interface->params, channels) < 0 ) |
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159 | goto init_error; |
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160 | if ( snd_pcm_hw_params_set_rate_near(interface->handle, interface->params, &samplerate, NULL) < 0 ) |
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161 | goto init_error; |
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162 | if ( snd_pcm_hw_params_set_buffer_time_near(interface->handle, interface->params, &buffer_time, NULL) < 0 ) |
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163 | goto init_error; |
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164 | if ( snd_pcm_hw_params_set_period_size_near(interface->handle, interface->params, &frames, NULL) < 0 ) |
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165 | goto init_error; |
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166 | |
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167 | rc = snd_pcm_hw_params(interface->handle, interface->params); |
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168 | if (rc < 0) { |
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169 | ROAR_ERR("driver_alsa_open_vio(*): unable to set hw parameters: %s", snd_strerror(rc)); |
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170 | snd_pcm_hw_params_free(interface->params); |
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171 | goto init_error; |
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172 | } |
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173 | |
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174 | snd_pcm_hw_params_free(interface->params); |
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175 | |
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176 | memset(inst, 0, sizeof(struct roar_vio_calls)); |
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177 | |
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178 | inst->inst = (void*) interface; |
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179 | inst->write = driver_alsa_write; |
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180 | inst->close = driver_alsa_close; |
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181 | |
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182 | return 0; |
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183 | |
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184 | init_error: |
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185 | snd_pcm_close(interface->handle); |
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186 | roar_mm_free(interface); |
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187 | return -1; |
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188 | } |
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189 | |
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190 | int driver_alsa_close(struct roar_vio_calls * vio) { |
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191 | roar_alsa_t * device = vio->inst; |
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192 | |
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193 | if ( device->handle != NULL ) { |
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194 | snd_pcm_drain(device->handle); |
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195 | snd_pcm_close(device->handle); |
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196 | } |
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197 | |
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198 | roar_mm_free(device); |
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199 | |
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200 | return 0; |
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201 | } |
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202 | |
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203 | static ssize_t driver_alsa_write_int(struct roar_vio_calls * vio, void *buf, size_t size) { |
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204 | roar_alsa_t * device = vio->inst; |
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205 | snd_pcm_sframes_t write_size = snd_pcm_bytes_to_frames(device->handle, size); |
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206 | snd_pcm_sframes_t rc; |
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207 | |
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208 | ROAR_DBG("driver_alsa_write(vio=%p, buf=%p, size=%llu) = ?", vio, buf, (long long unsigned int)size); |
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209 | |
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210 | rc = snd_pcm_writei(device->handle, buf, write_size); |
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211 | |
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212 | if ( rc == -EPIPE || rc == -EINTR || rc == -ESTRPIPE ) { |
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213 | if ( snd_pcm_recover(device->handle, rc, 1) < 0 ) |
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214 | return -1; |
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215 | return size; |
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216 | } else if (rc < 0) { |
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217 | ROAR_ERR("driver_alsa_write(*): Error from snd_pcm_writei(*): %s", snd_strerror(rc)); |
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218 | return -1; |
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219 | } |
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220 | |
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221 | return snd_pcm_frames_to_bytes(device->handle, rc); |
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222 | } |
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223 | |
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224 | ssize_t driver_alsa_write(struct roar_vio_calls * vio, void *buf, size_t size) { |
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225 | ssize_t have = 0; |
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226 | ssize_t ret; |
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227 | |
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228 | while (size) { |
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229 | ret = driver_alsa_write_int(vio, buf, size); |
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230 | if ( ret < 0 ) |
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231 | return -1; |
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232 | |
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233 | have += ret; |
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234 | buf += ret; |
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235 | size -= ret; |
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236 | } |
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237 | |
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238 | return have; |
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239 | } |
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240 | |
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241 | #endif |
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242 | |
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