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annotate src/audio/alsa/SDL_alsa_audio.c @ 3845:ee5dfa7f7993 SDL-ryan-multiple-audio-device

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ALSA's availability test was wrong in multi-device land. If the ALSA libraries are available, we should use them and report zero available devices instead.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 08:04:51 +0000
parents 25052dd25810
children 66fb40445587
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 <dlfcn.h>
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29 #include <errno.h>
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30 #include <string.h>
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31
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32 #include "SDL_timer.h"
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33 #include "SDL_audio.h"
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34 #include "../SDL_audiomem.h"
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35 #include "../SDL_audio_c.h"
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36 #include "SDL_alsa_audio.h"
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37
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38
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39 /* The tag name used by ALSA audio */
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40 #define DRIVER_NAME "alsa"
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41
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42 /* The default ALSA audio driver */
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43 #define DEFAULT_DEVICE "default"
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44
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45 static int (*ALSA_snd_pcm_open)
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46 (snd_pcm_t **, const char *, snd_pcm_stream_t, int);
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47 static int (*ALSA_snd_pcm_close)(snd_pcm_t * pcm);
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48 static snd_pcm_sframes_t(*ALSA_snd_pcm_writei)
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49 (snd_pcm_t *,const void *, snd_pcm_uframes_t);
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50 static int (*ALSA_snd_pcm_resume)(snd_pcm_t *);
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51 static int (*ALSA_snd_pcm_prepare)(snd_pcm_t *);
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52 static int (*ALSA_snd_pcm_drain)(snd_pcm_t *);
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53 static const char *(*ALSA_snd_strerror)(int);
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54 static size_t(*ALSA_snd_pcm_hw_params_sizeof)(void);
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55 static size_t(*ALSA_snd_pcm_sw_params_sizeof)(void);
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56 static int (*ALSA_snd_pcm_hw_params_any)(snd_pcm_t *, snd_pcm_hw_params_t *);
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57 static int (*ALSA_snd_pcm_hw_params_set_access)
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58 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_access_t);
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59 static int (*ALSA_snd_pcm_hw_params_set_format)
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60 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
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61 static int (*ALSA_snd_pcm_hw_params_set_channels)
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62 (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int);
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63 static int (*ALSA_snd_pcm_hw_params_get_channels)(const snd_pcm_hw_params_t *);
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64 static unsigned int (*ALSA_snd_pcm_hw_params_set_rate_near)
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65 (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int, int *);
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66 static snd_pcm_uframes_t (*ALSA_snd_pcm_hw_params_set_period_size_near)
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67 (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_uframes_t, int *);
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68 static snd_pcm_sframes_t (*ALSA_snd_pcm_hw_params_get_period_size)
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69 (const snd_pcm_hw_params_t *);
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70 static unsigned int (*ALSA_snd_pcm_hw_params_set_periods_near)
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71 (snd_pcm_t *,snd_pcm_hw_params_t *, unsigned int, int *);
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72 static int (*ALSA_snd_pcm_hw_params_get_periods)(snd_pcm_hw_params_t *);
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73 static int (*ALSA_snd_pcm_hw_params)(snd_pcm_t *, snd_pcm_hw_params_t *);
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74 static int (*ALSA_snd_pcm_sw_params_current)(snd_pcm_t*, snd_pcm_sw_params_t*);
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75 static int (*ALSA_snd_pcm_sw_params_set_start_threshold)
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76 (snd_pcm_t *, snd_pcm_sw_params_t *, snd_pcm_uframes_t);
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77 static int (*ALSA_snd_pcm_sw_params_set_avail_min)
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78 (snd_pcm_t *, snd_pcm_sw_params_t *, snd_pcm_uframes_t);
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79 static int (*ALSA_snd_pcm_sw_params)(snd_pcm_t *, snd_pcm_sw_params_t *);
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80 static int (*ALSA_snd_pcm_nonblock)(snd_pcm_t *, int);
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81 #define snd_pcm_hw_params_sizeof ALSA_snd_pcm_hw_params_sizeof
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82 #define snd_pcm_sw_params_sizeof ALSA_snd_pcm_sw_params_sizeof
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83
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84
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85 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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86
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87 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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88 static void *alsa_handle = NULL;
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89
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90 static int
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91 load_alsa_sym(const char *fn, void **addr)
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92 {
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93 /*
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94 * !!! FIXME:
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95 * Eventually, this will deal with fallbacks, version changes, and
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96 * missing symbols we can workaround. But for now, it doesn't.
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97 */
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98
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99 #if HAVE_DLVSYM
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100 *addr = dlvsym(alsa_handle, fn, "ALSA_0.9");
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101 if (*addr == NULL)
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102 #endif
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103 {
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104 *addr = dlsym(alsa_handle, fn);
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105 if (*addr == NULL) {
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106 SDL_SetError("dlsym('%s') failed: %s", fn, strerror(errno));
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107 return 0;
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108 }
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109 }
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110
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111 return 1;
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112 }
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113
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114 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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115 #define SDL_ALSA_SYM(x) \
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116 if (!load_alsa_sym(#x, (void **) (char *) &ALSA_##x)) return -1
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117 #else
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118 #define SDL_ALSA_SYM(x) ALSA_##x = x
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119 #endif
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120
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121 static int load_alsa_syms(void)
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122 {
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123 SDL_ALSA_SYM(snd_pcm_open);
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124 SDL_ALSA_SYM(snd_pcm_close);
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125 SDL_ALSA_SYM(snd_pcm_writei);
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126 SDL_ALSA_SYM(snd_pcm_resume);
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127 SDL_ALSA_SYM(snd_pcm_prepare);
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128 SDL_ALSA_SYM(snd_pcm_drain);
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129 SDL_ALSA_SYM(snd_strerror);
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130 SDL_ALSA_SYM(snd_pcm_hw_params_sizeof);
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131 SDL_ALSA_SYM(snd_pcm_sw_params_sizeof);
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132 SDL_ALSA_SYM(snd_pcm_hw_params_any);
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133 SDL_ALSA_SYM(snd_pcm_hw_params_set_access);
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134 SDL_ALSA_SYM(snd_pcm_hw_params_set_format);
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135 SDL_ALSA_SYM(snd_pcm_hw_params_set_channels);
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136 SDL_ALSA_SYM(snd_pcm_hw_params_get_channels);
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137 SDL_ALSA_SYM(snd_pcm_hw_params_set_rate_near);
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138 SDL_ALSA_SYM(snd_pcm_hw_params_set_period_size_near);
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139 SDL_ALSA_SYM(snd_pcm_hw_params_get_period_size);
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140 SDL_ALSA_SYM(snd_pcm_hw_params_set_periods_near);
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141 SDL_ALSA_SYM(snd_pcm_hw_params_get_periods);
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142 SDL_ALSA_SYM(snd_pcm_hw_params);
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143 SDL_ALSA_SYM(snd_pcm_sw_params_current);
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144 SDL_ALSA_SYM(snd_pcm_sw_params_set_start_threshold);
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145 SDL_ALSA_SYM(snd_pcm_sw_params_set_avail_min);
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146 SDL_ALSA_SYM(snd_pcm_sw_params);
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147 SDL_ALSA_SYM(snd_pcm_nonblock);
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148 return 0;
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149 }
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150 #undef SDL_ALSA_SYM
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151
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152 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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153
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154 static int library_load_count = 0;
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155
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156 static void
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157 UnloadALSALibrary(void)
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158 {
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159 if ((alsa_handle != NULL) && (--library_load_count == 0)) {
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160 dlclose(alsa_handle);
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161 alsa_handle = NULL;
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162 }
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163 }
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164
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165 static int
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166 LoadALSALibrary(void)
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167 {
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168 int retval = 0;
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169 if (library_load_count++ == 0) {
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170 alsa_handle = dlopen(alsa_library, RTLD_NOW);
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171 if (alsa_handle == NULL) {
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172 library_load_count--;
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173 retval = -1;
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174 SDL_SetError("ALSA: dlopen('%s') failed: %s\n",
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175 alsa_library, strerror(errno));
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176 } else {
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177 retval = load_alsa_syms();
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178 if (retval < 0) {
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179 UnloadALSALibrary();
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180 }
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181 }
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182 }
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183 return retval;
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184 }
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185
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186 #else
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187
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188 static void
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189 UnloadALSALibrary(void)
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190 {
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191 }
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192
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193 static int
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194 LoadALSALibrary(void)
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195 {
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196 load_alsa_syms();
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197 return 0;
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198 }
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199
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200 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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201
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diff changeset
202 static const char *
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203 get_audio_device(int channels)
354
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diff changeset
204 {
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205 const char *device;
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206
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207 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
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208 if (device == NULL) {
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209 if (channels == 6)
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210 device = "surround51";
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211 else if (channels == 4)
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212 device = "surround40";
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213 else
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214 device = DEFAULT_DEVICE;
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215 }
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216 return device;
0
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217 }
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218
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219
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220 static int
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221 ALSA_Available(void)
0
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222 {
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223 int available = 0;
0
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224
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diff changeset
225 if (LoadALSALibrary() >= 0) {
3845
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226 available = 1;
3819
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227 UnloadALSALibrary();
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228 }
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229 return (available);
0
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230 }
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231
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232
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233
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234 /* This function waits until it is possible to write a full sound buffer */
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235 static void
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236 ALSA_WaitDevice(_THIS)
0
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237 {
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238 /* Check to see if the thread-parent process is still alive */
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239 {
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240 static int cnt = 0;
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241 /* Note that this only works with thread implementations
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242 that use a different process id for each thread.
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243 */
3819
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244 /* Check every 10 loops */
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245 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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246 if (kill(this->hidden->parent, 0) < 0) {
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247 this->enabled = 0;
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248 }
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249 }
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250 }
0
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251 }
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252
1878
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253
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254 /* !!! FIXME: is there a channel swizzler in alsalib instead? */
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255 /*
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256 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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257 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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258 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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259 */
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260 #define SWIZ6(T) \
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261 T *ptr = (T *) this->hidden->mixbuf; \
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262 const Uint32 count = (this->spec.samples / 6); \
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263 Uint32 i; \
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264 for (i = 0; i < count; i++, ptr += 6) { \
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265 T tmp; \
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266 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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267 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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268 }
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269
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270 static __inline__ void
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271 swizzle_alsa_channels_6_64bit(_THIS)
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272 {
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273 SWIZ6(Uint64);
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274 }
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275 static __inline__ void
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276 swizzle_alsa_channels_6_32bit(_THIS)
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277 {
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278 SWIZ6(Uint32);
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279 }
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280 static __inline__ void
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281 swizzle_alsa_channels_6_16bit(_THIS)
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282 {
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283 SWIZ6(Uint16);
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284 }
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285 static __inline__ void
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286 swizzle_alsa_channels_6_8bit(_THIS)
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287 {
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288 SWIZ6(Uint8);
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289 }
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290
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291 #undef SWIZ6
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292
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293
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294 /*
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295 * Called right before feeding this->hidden->mixbuf to the hardware. Swizzle
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296 * channels from Windows/Mac order to the format alsalib will want.
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297 */
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298 static __inline__ void
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299 swizzle_alsa_channels(_THIS)
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300 {
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301 if (this->spec.channels == 6) {
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302 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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303 if (fmtsize == 16)
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304 swizzle_alsa_channels_6_16bit(this);
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305 else if (fmtsize == 8)
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306 swizzle_alsa_channels_6_8bit(this);
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307 else if (fmtsize == 32)
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308 swizzle_alsa_channels_6_32bit(this);
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309 else if (fmtsize == 64)
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310 swizzle_alsa_channels_6_64bit(this);
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311 }
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312
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313 /* !!! FIXME: update this for 7.1 if needed, later. */
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314 }
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315
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316
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317 static void
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318 ALSA_PlayDevice(_THIS)
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319 {
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320 int status;
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321 int sample_len;
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322 signed short *sample_buf;
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4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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323
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324 swizzle_alsa_channels(this);
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325
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326 sample_len = this->spec.samples;
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327 sample_buf = (signed short *) this->hidden->mixbuf;
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328
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329 while (sample_len > 0) {
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330 status = ALSA_snd_pcm_writei(this->hidden->pcm_handle,
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331 sample_buf, sample_len);
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332
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333 if (status < 0) {
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334 if (status == -EAGAIN) {
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335 SDL_Delay(1);
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336 continue;
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337 }
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338 if (status == -ESTRPIPE) {
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339 do {
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340 SDL_Delay(1);
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341 status = ALSA_snd_pcm_resume(this->hidden->pcm_handle);
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342 } while (status == -EAGAIN);
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343 }
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344 if (status < 0) {
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345 status = ALSA_snd_pcm_prepare(this->hidden->pcm_handle);
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346 }
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347 if (status < 0) {
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348 /* Hmm, not much we can do - abort */
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349 this->enabled = 0;
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350 return;
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351 }
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352 continue;
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353 }
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354 sample_buf += status * this->spec.channels;
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355 sample_len -= status;
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356 }
0
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357 }
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358
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359 static Uint8 *
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360 ALSA_GetDeviceBuf(_THIS)
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361 {
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362 return (this->hidden->mixbuf);
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363 }
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364
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365 static void
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366 ALSA_CloseDevice(_THIS)
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367 {
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368 if (this->hidden != NULL) {
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369 if (this->hidden->mixbuf != NULL) {
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370 SDL_FreeAudioMem(this->hidden->mixbuf);
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371 this->hidden->mixbuf = NULL;
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372 }
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373 if (this->hidden->pcm_handle) {
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374 ALSA_snd_pcm_drain(this->hidden->pcm_handle);
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375 ALSA_snd_pcm_close(this->hidden->pcm_handle);
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376 this->hidden->pcm_handle = NULL;
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377 }
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
378 SDL_free(this->hidden);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
379 this->hidden = NULL;
3824
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
380 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
381 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
382 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
383
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
384 static int
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
385 ALSA_OpenDevice(_THIS, const char *devname, int iscapture)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
387 int status = 0;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
388 snd_pcm_t *pcm_handle = NULL;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
389 snd_pcm_hw_params_t *hwparams = NULL;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
390 snd_pcm_sw_params_t *swparams = NULL;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
391 snd_pcm_format_t format = 0;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
392 snd_pcm_uframes_t frames = 0;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
393 SDL_AudioFormat test_format = 0;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
394
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
395 /* Initialize all variables that we clean on shutdown */
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
396 this->hidden = (struct SDL_PrivateAudioData *)
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
397 SDL_malloc((sizeof *this->hidden));
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
398 if (this->hidden == NULL) {
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
399 SDL_OutOfMemory();
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
400 return 0;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
401 }
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
402 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403
3824
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
404 if (LoadALSALibrary() < 0) {
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
405 ALSA_CloseDevice(this);
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
406 return 0;
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
407 }
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
408
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
409 /* 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
410 /* Name of device should depend on # channels in spec */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
411 status = ALSA_snd_pcm_open(&pcm_handle,
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
412 get_audio_device(this->spec.channels),
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
413 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
414
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
415 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
416 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
417 SDL_SetError("ALSA: Couldn't open audio device: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
418 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
419 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
420 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
421
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
422 this->hidden->pcm_handle = pcm_handle;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
423
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
424 /* 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
425 snd_pcm_hw_params_alloca(&hwparams);
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
426 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
427 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
428 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
429 SDL_SetError("ALSA: Couldn't get hardware config: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
430 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
431 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
432 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
433
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
434 /* SDL only uses interleaved sample output */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
435 status = ALSA_snd_pcm_hw_params_set_access(pcm_handle, hwparams,
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
436 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
437 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
438 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
439 SDL_SetError("ALSA: Couldn't set interleaved access: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
440 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
441 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
442 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443
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
444 /* 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
445 status = -1;
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
446 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
447 test_format && (status < 0);) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
448 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
449 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
450 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
451 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
452 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
453 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
454 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
455 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
456 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
457 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
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 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
460 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
461 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
462 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
463 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
464 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
465 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
466 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
467 break;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
468 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
469 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
470 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
471 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
472 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
473 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
474 case AUDIO_F32LSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
475 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
476 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
477 case AUDIO_F32MSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
478 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
479 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
480 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
481 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
482 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
483 }
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
484 if (status >= 0) {
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
485 status = ALSA_snd_pcm_hw_params_set_format(pcm_handle,
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
486 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
487 }
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
488 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
489 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
490 }
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
491 }
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
492 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
493 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
494 SDL_SetError("ALSA: Couldn't find any hardware audio formats");
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
495 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
496 }
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
497 this->spec.format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498
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
499 /* Set the number of channels */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
500 status = ALSA_snd_pcm_hw_params_set_channels(pcm_handle, hwparams,
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
501 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
502 if (status < 0) {
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
503 status = ALSA_snd_pcm_hw_params_get_channels(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
504 if ((status <= 0) || (status > 2)) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
505 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
506 SDL_SetError("ALSA: Couldn't set audio channels");
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
507 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
508 }
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
509 this->spec.channels = status;
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
510 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
511
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
512 /* Set the audio rate */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
513 status = ALSA_snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams,
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
514 this->spec.freq, 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
515 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
516 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
517 SDL_SetError("ALSA: Couldn't set audio frequency: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
518 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
519 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
520 }
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
521 this->spec.freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522
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
523 /* Set the buffer size, in samples */
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
524 frames = this->spec.samples;
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
525 frames = ALSA_snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams,
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
526 frames, NULL);
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
527 this->spec.samples = frames;
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
528 ALSA_snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
529
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
530 /* "set" the hardware with the desired parameters */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
531 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
532 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
533 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
534 SDL_SetError("ALSA: Couldn't set hardware audio parameters: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
535 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
536 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
537 }
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
538
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
539 #if AUDIO_DEBUG
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
540 {
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
541 snd_pcm_sframes_t bufsize;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
542 int fragments;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
543 bufsize = ALSA_snd_pcm_hw_params_get_period_size(hwparams);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
544 fragments = ALSA_snd_pcm_hw_params_get_periods(hwparams);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
545 fprintf(stderr,"ALSA: bufsize = %ld, fragments = %d\n",bufsize,fragments);
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
546 }
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
547 #endif
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
548
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
549 /* 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
550 snd_pcm_sw_params_alloca(&swparams);
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
551 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
552 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
553 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
554 SDL_SetError("ALSA: Couldn't get software config: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
555 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
556 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
557 }
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
558 status = ALSA_snd_pcm_sw_params_set_start_threshold(pcm_handle,swparams,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 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
560 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
561 SDL_SetError("ALSA: Couldn't set start threshold: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
562 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
563 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
564 }
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
565 status = 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
566 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
567 ALSA_CloseDevice(this);
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
568 SDL_SetError("Couldn't set avail min: %s", ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
569 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
570 }
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
571 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
572 if (status < 0) {
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
573 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
574 SDL_SetError("Couldn't set software audio parameters: %s",
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
575 ALSA_snd_strerror(status));
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
576 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
577 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
578
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
579 /* Calculate the final parameters for this audio specification */
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
580 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
581
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
582 /* Allocate mixing buffer */
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
583 this->hidden->mixlen = this->spec.size;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
584 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
585 if (this->hidden->mixbuf == NULL) {
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
586 ALSA_CloseDevice(this);
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
587 SDL_OutOfMemory();
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
588 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
589 }
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
590 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
591
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
592 /* Get the parent process id (we're the parent of the audio thread) */
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
593 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
594
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 /* Switch to blocking mode for playback */
3818
49eadd6e8962 Mangled ALSA dynamic loading...static loading will still work if you have the
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
596 ALSA_snd_pcm_nonblock(pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
597
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
598 /* We're ready to rock and roll. :-) */
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
599 return 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
600 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601
3819
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
602 static int
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
603 ALSA_Init(SDL_AudioDriverImpl *impl)
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
604 {
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
605 /* Set the function pointers */
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
606 impl->OpenDevice = ALSA_OpenDevice;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
607 impl->WaitDevice = ALSA_WaitDevice;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
608 impl->GetDeviceBuf = ALSA_GetDeviceBuf;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
609 impl->PlayDevice = ALSA_PlayDevice;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
610 impl->CloseDevice = ALSA_CloseDevice;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
611 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Add device enum! */
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
612
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
613 return 1;
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
614 }
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
615
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
616
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
617 AudioBootStrap ALSA_bootstrap = {
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
618 DRIVER_NAME, "ALSA 0.9 PCM audio",
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
619 ALSA_Available, ALSA_Init, 0
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
620 };
b225d9820ee3 Updated a bunch of audio backends to 1.3 API (Dreamcast, OS/2, ALSA, and
Ryan C. Gordon <icculus@icculus.org>
parents: 3818
diff changeset
621
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
622 /* vi: set ts=4 sw=4 expandtab: */