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annotate src/audio/alsa/SDL_alsa_audio.c @ 3362:4e83cdb58134

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Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 10 Oct 2009 07:34:15 +0000
parents b21348d47cab
children 631173ffd68f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include <sys/types.h>
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27 #include <signal.h> /* For kill() */
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28 #include <errno.h>
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29 #include <string.h>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_audio.h"
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33 #include "../SDL_audiomem.h"
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34 #include "../SDL_audio_c.h"
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35 #include "SDL_alsa_audio.h"
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36
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37 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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38 #include "SDL_loadso.h"
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39 #endif
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40
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41 /* The tag name used by ALSA audio */
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42 #define DRIVER_NAME "alsa"
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43
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44 /* The default ALSA audio driver */
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45 #define DEFAULT_DEVICE "default"
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46
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47 static int (*ALSA_snd_pcm_open)
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48 (snd_pcm_t **, const char *, snd_pcm_stream_t, int);
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49 static int (*ALSA_snd_pcm_close) (snd_pcm_t * pcm);
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50 static snd_pcm_sframes_t(*ALSA_snd_pcm_writei)
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51 (snd_pcm_t *, const void *, snd_pcm_uframes_t);
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52 static int (*ALSA_snd_pcm_resume) (snd_pcm_t *);
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53 static int (*ALSA_snd_pcm_prepare) (snd_pcm_t *);
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54 static int (*ALSA_snd_pcm_drain) (snd_pcm_t *);
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55 static const char *(*ALSA_snd_strerror) (int);
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56 static size_t(*ALSA_snd_pcm_hw_params_sizeof) (void);
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57 static size_t(*ALSA_snd_pcm_sw_params_sizeof) (void);
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58 static int (*ALSA_snd_pcm_hw_params_any) (snd_pcm_t *, snd_pcm_hw_params_t *);
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59 static int (*ALSA_snd_pcm_hw_params_set_access)
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60 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_access_t);
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61 static int (*ALSA_snd_pcm_hw_params_set_format)
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62 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
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63 static int (*ALSA_snd_pcm_hw_params_set_channels)
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64 (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int);
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65 static int (*ALSA_snd_pcm_hw_params_set_rate_near)
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66 (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
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67 static int (*ALSA_snd_pcm_hw_params_set_period_size_near)
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68 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
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69 static int (*ALSA_snd_pcm_hw_params_get_channels)
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70 (const snd_pcm_hw_params_t *, unsigned int *);
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71 static snd_pcm_sframes_t(*ALSA_snd_pcm_hw_params_get_period_size)
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72 (const snd_pcm_hw_params_t *);
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73 static int (*ALSA_snd_pcm_hw_params_set_periods_near)
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74 (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
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75 static int (*ALSA_snd_pcm_hw_params_get_periods) (snd_pcm_hw_params_t *);
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76 static int (*ALSA_snd_pcm_hw_params) (snd_pcm_t *, snd_pcm_hw_params_t *);
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77 static int (*ALSA_snd_pcm_sw_params_current) (snd_pcm_t *,
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78 snd_pcm_sw_params_t *);
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79 static int (*ALSA_snd_pcm_sw_params_set_start_threshold)
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80 (snd_pcm_t *, snd_pcm_sw_params_t *, snd_pcm_uframes_t);
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81 static int (*ALSA_snd_pcm_sw_params_set_avail_min)
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82 (snd_pcm_t *, snd_pcm_sw_params_t *, snd_pcm_uframes_t);
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83 static int (*ALSA_snd_pcm_sw_params) (snd_pcm_t *, snd_pcm_sw_params_t *);
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84 static int (*ALSA_snd_pcm_nonblock) (snd_pcm_t *, int);
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85 #define snd_pcm_hw_params_sizeof ALSA_snd_pcm_hw_params_sizeof
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86 #define snd_pcm_sw_params_sizeof ALSA_snd_pcm_sw_params_sizeof
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87
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89 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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90
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91 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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92 static void *alsa_handle = NULL;
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93
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94 static int
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95 load_alsa_sym(const char *fn, void **addr)
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96 {
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97 *addr = SDL_LoadFunction(alsa_handle, fn);
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98 if (*addr == NULL) {
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99 /* Don't call SDL_SetError(): SDL_LoadFunction already did. */
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100 return 0;
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101 }
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102
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103 return 1;
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104 }
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105
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106 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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107 #define SDL_ALSA_SYM(x) \
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108 if (!load_alsa_sym(#x, (void **) (char *) &ALSA_##x)) return -1
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109 #else
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110 #define SDL_ALSA_SYM(x) ALSA_##x = x
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111 #endif
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112
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113 static int
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114 load_alsa_syms(void)
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115 {
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116 SDL_ALSA_SYM(snd_pcm_open);
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117 SDL_ALSA_SYM(snd_pcm_close);
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118 SDL_ALSA_SYM(snd_pcm_writei);
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119 SDL_ALSA_SYM(snd_pcm_resume);
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120 SDL_ALSA_SYM(snd_pcm_prepare);
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121 SDL_ALSA_SYM(snd_pcm_drain);
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122 SDL_ALSA_SYM(snd_strerror);
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123 SDL_ALSA_SYM(snd_pcm_hw_params_sizeof);
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124 SDL_ALSA_SYM(snd_pcm_sw_params_sizeof);
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125 SDL_ALSA_SYM(snd_pcm_hw_params_any);
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126 SDL_ALSA_SYM(snd_pcm_hw_params_set_access);
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127 SDL_ALSA_SYM(snd_pcm_hw_params_set_format);
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128 SDL_ALSA_SYM(snd_pcm_hw_params_set_channels);
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129 SDL_ALSA_SYM(snd_pcm_hw_params_get_channels);
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130 SDL_ALSA_SYM(snd_pcm_hw_params_set_rate_near);
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131 SDL_ALSA_SYM(snd_pcm_hw_params_set_period_size_near);
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132 SDL_ALSA_SYM(snd_pcm_hw_params_get_period_size);
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133 SDL_ALSA_SYM(snd_pcm_hw_params_set_periods_near);
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134 SDL_ALSA_SYM(snd_pcm_hw_params_get_periods);
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135 SDL_ALSA_SYM(snd_pcm_hw_params);
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136 SDL_ALSA_SYM(snd_pcm_sw_params_current);
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137 SDL_ALSA_SYM(snd_pcm_sw_params_set_start_threshold);
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138 SDL_ALSA_SYM(snd_pcm_sw_params_set_avail_min);
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139 SDL_ALSA_SYM(snd_pcm_sw_params);
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140 SDL_ALSA_SYM(snd_pcm_nonblock);
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141 return 0;
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142 }
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143
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144 #undef SDL_ALSA_SYM
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145
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146 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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147
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148 static void
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149 UnloadALSALibrary(void)
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150 {
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151 if (alsa_handle != NULL) {
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152 SDL_UnloadObject(alsa_handle);
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153 alsa_handle = NULL;
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154 }
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155 }
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156
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157 static int
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158 LoadALSALibrary(void)
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159 {
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160 int retval = 0;
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161 if (alsa_handle == NULL) {
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162 alsa_handle = SDL_LoadObject(alsa_library);
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163 if (alsa_handle == NULL) {
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164 retval = -1;
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165 /* Don't call SDL_SetError(): SDL_LoadObject already did. */
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166 } else {
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167 retval = load_alsa_syms();
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168 if (retval < 0) {
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169 UnloadALSALibrary();
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170 }
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171 }
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172 }
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173 return retval;
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174 }
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175
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176 #else
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177
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178 static void
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179 UnloadALSALibrary(void)
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180 {
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181 }
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182
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183 static int
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184 LoadALSALibrary(void)
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185 {
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186 load_alsa_syms();
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187 return 0;
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188 }
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189
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190 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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191
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192 static const char *
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193 get_audio_device(int channels)
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194 {
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195 const char *device;
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196
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197 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
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198 if (device == NULL) {
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199 if (channels == 6)
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200 device = "surround51";
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201 else if (channels == 4)
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202 device = "surround40";
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203 else
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204 device = DEFAULT_DEVICE;
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205 }
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206 return device;
0
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207 }
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208
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209
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210 /* This function waits until it is possible to write a full sound buffer */
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211 static void
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212 ALSA_WaitDevice(_THIS)
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213 {
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214 /* Check to see if the thread-parent process is still alive */
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215 {
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216 static int cnt = 0;
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217 /* Note that this only works with thread implementations
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218 that use a different process id for each thread.
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219 */
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220 /* Check every 10 loops */
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221 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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222 if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) {
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223 this->enabled = 0;
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224 }
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225 }
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226 }
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227 }
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228
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229
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230 /* !!! FIXME: is there a channel swizzler in alsalib instead? */
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231 /*
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232 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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233 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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234 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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235 */
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236 #define SWIZ6(T) \
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237 T *ptr = (T *) this->hidden->mixbuf; \
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238 const Uint32 count = (this->spec.samples / 6); \
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239 Uint32 i; \
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240 for (i = 0; i < count; i++, ptr += 6) { \
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241 T tmp; \
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242 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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243 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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244 }
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245
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246 static __inline__ void
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247 swizzle_alsa_channels_6_64bit(_THIS)
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248 {
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249 SWIZ6(Uint64);
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250 }
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251
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252 static __inline__ void
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253 swizzle_alsa_channels_6_32bit(_THIS)
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254 {
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255 SWIZ6(Uint32);
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256 }
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257
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258 static __inline__ void
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259 swizzle_alsa_channels_6_16bit(_THIS)
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260 {
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261 SWIZ6(Uint16);
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262 }
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263
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264 static __inline__ void
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265 swizzle_alsa_channels_6_8bit(_THIS)
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266 {
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267 SWIZ6(Uint8);
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268 }
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269
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270 #undef SWIZ6
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271
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272
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273 /*
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274 * Called right before feeding this->hidden->mixbuf to the hardware. Swizzle
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275 * channels from Windows/Mac order to the format alsalib will want.
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276 */
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277 static __inline__ void
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278 swizzle_alsa_channels(_THIS)
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279 {
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280 if (this->spec.channels == 6) {
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281 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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282 if (fmtsize == 16)
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283 swizzle_alsa_channels_6_16bit(this);
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284 else if (fmtsize == 8)
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285 swizzle_alsa_channels_6_8bit(this);
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286 else if (fmtsize == 32)
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287 swizzle_alsa_channels_6_32bit(this);
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288 else if (fmtsize == 64)
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289 swizzle_alsa_channels_6_64bit(this);
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290 }
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291
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292 /* !!! FIXME: update this for 7.1 if needed, later. */
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293 }
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294
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295
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296 static void
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297 ALSA_PlayDevice(_THIS)
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298 {
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299 int status;
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300 int sample_len;
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301 signed short *sample_buf;
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302
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303 swizzle_alsa_channels(this);
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304
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305 sample_len = this->spec.samples;
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306 sample_buf = (signed short *) this->hidden->mixbuf;
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307
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308 while (sample_len > 0) {
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309 status = ALSA_snd_pcm_writei(this->hidden->pcm_handle,
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310 sample_buf, sample_len);
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311
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312 if (status < 0) {
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313 if (status == -EAGAIN) {
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314 SDL_Delay(1);
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315 continue;
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316 }
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317 if (status == -ESTRPIPE) {
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318 do {
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319 SDL_Delay(1);
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320 status = ALSA_snd_pcm_resume(this->hidden->pcm_handle);
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321 } while (status == -EAGAIN);
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322 }
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323 if (status < 0) {
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324 status = ALSA_snd_pcm_prepare(this->hidden->pcm_handle);
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325 }
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326 if (status < 0) {
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327 /* Hmm, not much we can do - abort */
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328 this->enabled = 0;
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329 return;
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330 }
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331 continue;
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332 }
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333 sample_buf += status * this->spec.channels;
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334 sample_len -= status;
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335 }
0
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336 }
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337
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338 static Uint8 *
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339 ALSA_GetDeviceBuf(_THIS)
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340 {
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341 return (this->hidden->mixbuf);
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342 }
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343
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344 static void
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345 ALSA_CloseDevice(_THIS)
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346 {
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347 if (this->hidden != NULL) {
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348 if (this->hidden->mixbuf != NULL) {
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349 SDL_FreeAudioMem(this->hidden->mixbuf);
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350 this->hidden->mixbuf = NULL;
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351 }
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352 if (this->hidden->pcm_handle) {
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353 ALSA_snd_pcm_drain(this->hidden->pcm_handle);
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354 ALSA_snd_pcm_close(this->hidden->pcm_handle);
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355 this->hidden->pcm_handle = NULL;
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356 }
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357 SDL_free(this->hidden);
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358 this->hidden = NULL;
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359 }
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360 }
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361
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362 static int
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363 ALSA_OpenDevice(_THIS, const char *devname, int iscapture)
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364 {
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365 int status = 0;
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366 snd_pcm_t *pcm_handle = NULL;
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367 snd_pcm_hw_params_t *hwparams = NULL;
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368 snd_pcm_sw_params_t *swparams = NULL;
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parents: 2043
diff changeset
369 snd_pcm_format_t format = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
370 snd_pcm_uframes_t frames = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
371 SDL_AudioFormat test_format = 0;
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
372 unsigned int rate = 0;
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
373 unsigned int periods = 0;
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
374 unsigned int channels = 0;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
375
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
376 /* Initialize all variables that we clean on shutdown */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
377 this->hidden = (struct SDL_PrivateAudioData *)
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
378 SDL_malloc((sizeof *this->hidden));
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
379 if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
380 SDL_OutOfMemory();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
381 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
382 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
383 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
385 /* Open the audio device */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
386 /* Name of device should depend on # channels in spec */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
387 status = ALSA_snd_pcm_open(&pcm_handle,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
388 get_audio_device(this->spec.channels),
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
389 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
390
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
391 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
392 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
393 SDL_SetError("ALSA: Couldn't open audio device: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
394 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
395 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
396 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
397
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
398 this->hidden->pcm_handle = pcm_handle;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
399
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
400 /* Figure out what the hardware is capable of */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
401 snd_pcm_hw_params_alloca(&hwparams);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
402 status = ALSA_snd_pcm_hw_params_any(pcm_handle, hwparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
403 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
404 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
405 SDL_SetError("ALSA: Couldn't get hardware config: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
406 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
407 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
408 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
409
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
410 /* SDL only uses interleaved sample output */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
411 status = ALSA_snd_pcm_hw_params_set_access(pcm_handle, hwparams,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
412 SND_PCM_ACCESS_RW_INTERLEAVED);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
413 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
414 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
415 SDL_SetError("ALSA: Couldn't set interleaved access: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
416 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
417 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
418 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
420 /* Try for a closest match on audio format */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
421 status = -1;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
422 for (test_format = SDL_FirstAudioFormat(this->spec.format);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
423 test_format && (status < 0);) {
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
424 status = 0; /* if we can't support a format, it'll become -1. */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
425 switch (test_format) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
426 case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
427 format = SND_PCM_FORMAT_U8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
428 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
429 case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
430 format = SND_PCM_FORMAT_S8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
431 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
432 case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
433 format = SND_PCM_FORMAT_S16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
434 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
435 case AUDIO_S16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
436 format = SND_PCM_FORMAT_S16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
437 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
438 case AUDIO_U16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
439 format = SND_PCM_FORMAT_U16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
440 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
441 case AUDIO_U16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
442 format = SND_PCM_FORMAT_U16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
443 break;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
444 case AUDIO_S32LSB:
2010
39897da56f63 Whoops, wrong tokens for int32 support in ALSA driver (specified unsigned
Ryan C. Gordon <icculus@icculus.org>
parents: 2009
diff changeset
445 format = SND_PCM_FORMAT_S32_LE;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
446 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
447 case AUDIO_S32MSB:
2010
39897da56f63 Whoops, wrong tokens for int32 support in ALSA driver (specified unsigned
Ryan C. Gordon <icculus@icculus.org>
parents: 2009
diff changeset
448 format = SND_PCM_FORMAT_S32_BE;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
449 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
450 case AUDIO_F32LSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
451 format = SND_PCM_FORMAT_FLOAT_LE;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
452 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
453 case AUDIO_F32MSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
454 format = SND_PCM_FORMAT_FLOAT_BE;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
455 break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
456 default:
2009
f2058fb367e4 ALSA was testing if (format) was set to zero as an error condition, but
Ryan C. Gordon <icculus@icculus.org>
parents: 1995
diff changeset
457 status = -1;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
458 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
459 }
2009
f2058fb367e4 ALSA was testing if (format) was set to zero as an error condition, but
Ryan C. Gordon <icculus@icculus.org>
parents: 1995
diff changeset
460 if (status >= 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
461 status = ALSA_snd_pcm_hw_params_set_format(pcm_handle,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
462 hwparams, format);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
463 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
464 if (status < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
465 test_format = SDL_NextAudioFormat();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
466 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
467 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
468 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
469 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
470 SDL_SetError("ALSA: Couldn't find any hardware audio formats");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
471 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
472 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
473 this->spec.format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
475 /* Set the number of channels */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
476 status = ALSA_snd_pcm_hw_params_set_channels(pcm_handle, hwparams,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
477 this->spec.channels);
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
478 channels = this->spec.channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
479 if (status < 0) {
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
480 status = ALSA_snd_pcm_hw_params_get_channels(hwparams, &channels);
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
481 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
482 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
483 SDL_SetError("ALSA: Couldn't set audio channels");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
484 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
485 }
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
486 this->spec.channels = channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
487 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
489 /* Set the audio rate */
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
490 rate = this->spec.freq;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
491 status = ALSA_snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams,
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
492 &rate, NULL);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
493 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
494 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
495 SDL_SetError("ALSA: Couldn't set audio frequency: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
496 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
497 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
498 }
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
499 this->spec.freq = rate;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
501 /* Set the buffer size, in samples */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
502 frames = this->spec.samples;
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
503 status = ALSA_snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams,
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
504 &frames, NULL);
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
505 if ( status < 0 ) {
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
506 ALSA_CloseDevice(this);
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
507 SDL_SetError("ALSA: Couldn't set audio frequency: %s",
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
508 ALSA_snd_strerror(status));
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
509 return(-1);
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
510 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
511 this->spec.samples = frames;
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
512
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
513 periods = 2;
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
514 ALSA_snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams,
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
515 &periods, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
516
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
517 /* "set" the hardware with the desired parameters */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
518 status = ALSA_snd_pcm_hw_params(pcm_handle, hwparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
519 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
520 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
521 SDL_SetError("ALSA: Couldn't set hardware audio parameters: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
522 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
523 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
524 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
525 #if AUDIO_DEBUG
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
526 {
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
527 snd_pcm_sframes_t bufsize;
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
528 int fragments;
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
529 bufsize = ALSA_snd_pcm_hw_params_get_period_size(hwparams);
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
530 fragments = ALSA_snd_pcm_hw_params_get_periods(hwparams);
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
531 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize,
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
532 fragments);
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
533 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
534 #endif
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
535
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
536 /* Set the software parameters */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
537 snd_pcm_sw_params_alloca(&swparams);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
538 status = ALSA_snd_pcm_sw_params_current(pcm_handle, swparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
539 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
540 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
541 SDL_SetError("ALSA: Couldn't get software config: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
542 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
543 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
544 }
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
545 status =
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
546 ALSA_snd_pcm_sw_params_set_start_threshold(pcm_handle, swparams, 0);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
547 if (status < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
548 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
549 SDL_SetError("ALSA: Couldn't set start threshold: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
550 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
551 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
552 }
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
553 status =
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
554 ALSA_snd_pcm_sw_params_set_avail_min(pcm_handle, swparams, frames);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
555 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
556 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
557 SDL_SetError("Couldn't set avail min: %s", ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
558 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
559 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
560 status = ALSA_snd_pcm_sw_params(pcm_handle, swparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
561 if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
562 ALSA_CloseDevice(this);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
563 SDL_SetError("Couldn't set software audio parameters: %s",
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
564 ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
565 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
566 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
568 /* Calculate the final parameters for this audio specification */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
569 SDL_CalculateAudioSpec(&this->spec);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
570
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
571 /* Allocate mixing buffer */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
572 this->hidden->mixlen = this->spec.size;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
573 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
574 if (this->hidden->mixbuf == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
575 ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
576 SDL_OutOfMemory();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
577 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
578 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
579 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
580
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
581 /* Get the parent process id (we're the parent of the audio thread) */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
582 this->hidden->parent = getpid();
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
583
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
584 /* Switch to blocking mode for playback */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
585 ALSA_snd_pcm_nonblock(pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
587 /* We're ready to rock and roll. :-) */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
588 return 1;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
589 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
590
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
591 static void
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
592 ALSA_Deinitialize(void)
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
593 {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
594 UnloadALSALibrary();
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
595 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
596
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
597 static int
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
598 ALSA_Init(SDL_AudioDriverImpl * impl)
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
599 {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
600 if (LoadALSALibrary() < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
601 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
602 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
603
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
604 /* Set the function pointers */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
605 impl->OpenDevice = ALSA_OpenDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
606 impl->WaitDevice = ALSA_WaitDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
607 impl->GetDeviceBuf = ALSA_GetDeviceBuf;
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
608 impl->PlayDevice = ALSA_PlayDevice;
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parents: 2043
diff changeset
609 impl->CloseDevice = ALSA_CloseDevice;
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parents: 2043
diff changeset
610 impl->Deinitialize = ALSA_Deinitialize;
2060
866052b01ee5 indent is evil
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parents: 2049
diff changeset
611 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Add device enum! */
2049
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
612
2942
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parents: 2938
diff changeset
613 return 1; /* !!! FIXME: return 2 once device enum is implemented. */
2049
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
614 }
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
615
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
616
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
617 AudioBootStrap ALSA_bootstrap = {
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
618 DRIVER_NAME, "ALSA 0.9 PCM audio", ALSA_Init, 0
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
619 };
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Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
620
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
621 /* vi: set ts=4 sw=4 expandtab: */