Mercurial > sdl-ios-xcode

annotate src/audio/alsa/SDL_alsa_audio.c @ 3824:25052dd25810 SDL-ryan-multiple-audio-device

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Minor ALSA dynamic loading fix.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 07 Oct 2006 07:23:52 +0000
parents b225d9820ee3
children ee5dfa7f7993
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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202 static const char *
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203 get_audio_device(int channels)
354
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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;
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224 int status;
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225 snd_pcm_t *handle;
0
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226
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227 if (LoadALSALibrary() >= 0) {
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228 int status = ALSA_snd_pcm_open(&handle, get_audio_device(2),
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229 SND_PCM_STREAM_PLAYBACK,
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230 SND_PCM_NONBLOCK);
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231 if (status >= 0) {
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232 available = 1;
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233 ALSA_snd_pcm_close(handle);
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234 }
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235 UnloadALSALibrary();
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236 }
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237 return (available);
0
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238 }
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239
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240
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241
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242 /* This function waits until it is possible to write a full sound buffer */
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243 static void
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244 ALSA_WaitDevice(_THIS)
0
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245 {
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246 /* Check to see if the thread-parent process is still alive */
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247 {
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248 static int cnt = 0;
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249 /* Note that this only works with thread implementations
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250 that use a different process id for each thread.
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251 */
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252 /* Check every 10 loops */
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253 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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254 if (kill(this->hidden->parent, 0) < 0) {
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255 this->enabled = 0;
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256 }
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257 }
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258 }
0
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259 }
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260
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261
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262 /* !!! FIXME: is there a channel swizzler in alsalib instead? */
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263 /*
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264 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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265 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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266 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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267 */
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268 #define SWIZ6(T) \
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269 T *ptr = (T *) this->hidden->mixbuf; \
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270 const Uint32 count = (this->spec.samples / 6); \
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271 Uint32 i; \
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272 for (i = 0; i < count; i++, ptr += 6) { \
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273 T tmp; \
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274 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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275 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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276 }
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277
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278 static __inline__ void
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279 swizzle_alsa_channels_6_64bit(_THIS)
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280 {
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281 SWIZ6(Uint64);
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282 }
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283 static __inline__ void
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284 swizzle_alsa_channels_6_32bit(_THIS)
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285 {
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286 SWIZ6(Uint32);
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287 }
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288 static __inline__ void
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289 swizzle_alsa_channels_6_16bit(_THIS)
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290 {
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291 SWIZ6(Uint16);
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292 }
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293 static __inline__ void
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294 swizzle_alsa_channels_6_8bit(_THIS)
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295 {
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296 SWIZ6(Uint8);
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297 }
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298
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299 #undef SWIZ6
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300
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301
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302 /*
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303 * Called right before feeding this->hidden->mixbuf to the hardware. Swizzle
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304 * channels from Windows/Mac order to the format alsalib will want.
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305 */
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306 static __inline__ void
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307 swizzle_alsa_channels(_THIS)
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308 {
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309 if (this->spec.channels == 6) {
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310 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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311 if (fmtsize == 16)
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312 swizzle_alsa_channels_6_16bit(this);
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313 else if (fmtsize == 8)
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314 swizzle_alsa_channels_6_8bit(this);
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315 else if (fmtsize == 32)
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316 swizzle_alsa_channels_6_32bit(this);
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317 else if (fmtsize == 64)
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318 swizzle_alsa_channels_6_64bit(this);
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319 }
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320
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321 /* !!! FIXME: update this for 7.1 if needed, later. */
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322 }
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323
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324
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325 static void
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326 ALSA_PlayDevice(_THIS)
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327 {
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328 int status;
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329 int sample_len;
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330 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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331
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332 swizzle_alsa_channels(this);
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333
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334 sample_len = this->spec.samples;
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335 sample_buf = (signed short *) this->hidden->mixbuf;
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336
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337 while (sample_len > 0) {
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338 status = ALSA_snd_pcm_writei(this->hidden->pcm_handle,
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339 sample_buf, sample_len);
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340
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341 if (status < 0) {
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342 if (status == -EAGAIN) {
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343 SDL_Delay(1);
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344 continue;
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345 }
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346 if (status == -ESTRPIPE) {
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347 do {
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348 SDL_Delay(1);
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349 status = ALSA_snd_pcm_resume(this->hidden->pcm_handle);
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350 } while (status == -EAGAIN);
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351 }
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352 if (status < 0) {
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353 status = ALSA_snd_pcm_prepare(this->hidden->pcm_handle);
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354 }
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355 if (status < 0) {
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356 /* Hmm, not much we can do - abort */
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357 this->enabled = 0;
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358 return;
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359 }
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360 continue;
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361 }
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362 sample_buf += status * this->spec.channels;
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363 sample_len -= status;
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364 }
0
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365 }
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366
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367 static Uint8 *
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368 ALSA_GetDeviceBuf(_THIS)
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369 {
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370 return (this->hidden->mixbuf);
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371 }
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372
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373 static void
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374 ALSA_CloseDevice(_THIS)
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375 {
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376 if (this->hidden != NULL) {
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377 if (this->hidden->mixbuf != NULL) {
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parents: 3818
diff changeset
378 SDL_FreeAudioMem(this->hidden->mixbuf);
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->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
380 }
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
381 if (this->hidden->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
382 ALSA_snd_pcm_drain(this->hidden->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
383 ALSA_snd_pcm_close(this->hidden->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
384 this->hidden->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
385 }
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
386 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
387 this->hidden = NULL;
3824
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
388 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
389 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391
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
392 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
393 ALSA_OpenDevice(_THIS, const char *devname, int iscapture)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 {
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
395 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
396 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
397 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
398 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
399 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
400 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
401 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
402
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
403 /* 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
404 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
405 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
406 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
407 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
408 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
409 }
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
410 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411
3824
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
412 if (LoadALSALibrary() < 0) {
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
413 ALSA_CloseDevice(this);
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
414 return 0;
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
415 }
25052dd25810 Minor ALSA dynamic loading fix.
Ryan C. Gordon <icculus@icculus.org>
parents: 3819
diff changeset
416
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
417 /* 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
418 /* 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
419 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
420 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
421 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
422
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 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
424 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
425 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
426 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
427 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
428 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
429
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
430 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
431
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 /* 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
433 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
434 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
435 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
436 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
437 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
438 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
439 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
440 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
441
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 /* 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
443 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
444 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
445 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
446 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
447 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
448 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
449 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
450 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451
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
452 /* 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
453 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
454 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
455 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
456 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
457 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
458 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
459 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
460 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
461 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
462 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
463 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
464 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
465 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
466 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
467 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
468 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
469 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
470 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
471 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
472 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
473 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
474 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
475 break;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
476 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
477 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
478 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
479 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
480 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
481 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
482 case AUDIO_F32LSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
483 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
484 break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
485 case AUDIO_F32MSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
486 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
487 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
488 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
489 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
490 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
491 }
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
492 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
493 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
494 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
495 }
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 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
497 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
498 }
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 }
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
500 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
501 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
502 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
503 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
504 }
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 this->spec.format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506
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
507 /* 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
508 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
509 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
510 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
511 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
512 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
513 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
514 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
515 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
516 }
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
517 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
518 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519
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 /* 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
521 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
522 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
523 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
524 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
525 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
526 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
527 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
528 }
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
529 this->spec.freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530
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
531 /* 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
532 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
533 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
534 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
535 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
536 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
537
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
538 /* "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
539 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
540 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
541 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
542 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
543 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
544 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
545 }
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 #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
548 {
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
549 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
550 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
551 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
552 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
553 fprintf(stderr,"ALSA: bufsize = %ld, fragments = %d\n",bufsize,fragments);
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
554 }
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
555 #endif
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
556
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 /* 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
558 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
559 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
560 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
561 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
562 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
563 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
564 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
565 }
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
566 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
567 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
568 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
569 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
570 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
571 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
572 }
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
573 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
574 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
575 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
576 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
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 }
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
579 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
580 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
581 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
582 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
583 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
584 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
585 }
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 /* 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
588 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
589
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
590 /* 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
591 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
592 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
593 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
594 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
595 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
596 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
597 }
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
598 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599
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 /* 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
601 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
602
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
603 /* 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
604 ALSA_snd_pcm_nonblock(pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605
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
606 /* 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
607 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
608 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609
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
610 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
611 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
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 /* 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
614 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
615 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
616 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
617 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
618 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
619 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
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 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
622 }
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
623
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
624
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
625 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
626 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
627 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
628 };
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
629
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
630 /* vi: set ts=4 sw=4 expandtab: */