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annotate src/audio/alsa/SDL_alsa_audio.c @ 1338:604d73db6802

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Removed uses of stdlib.h and string.h
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 09:29:18 +0000
parents 3692456e7b0f
children c71e05b4dc2e
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
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23
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24
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25 /* Allow access to a raw mixing buffer */
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26
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27 #include <sys/types.h>
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28 #include <signal.h> /* For kill() */
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29
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30 #include "SDL_stdlib.h"
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31 #include "SDL_string.h"
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32 #include "SDL_audio.h"
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33 #include "SDL_error.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_timer.h"
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37 #include "SDL_alsa_audio.h"
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38
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39 #ifdef ALSA_DYNAMIC
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40 #ifdef USE_DLVSYM
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41 #ifndef __USE_GNU
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42 #define __USE_GNU
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43 #endif
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44 #endif
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45 #include <dlfcn.h>
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46 #include "SDL_name.h"
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47 #include "SDL_loadso.h"
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48 #else
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49 #define SDL_NAME(X) X
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50 #endif
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51
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52
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53 /* The tag name used by ALSA audio */
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54 #define DRIVER_NAME "alsa"
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55
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56 /* The default ALSA audio driver */
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57 #define DEFAULT_DEVICE "default"
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58
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59 /* Audio driver functions */
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60 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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61 static void ALSA_WaitAudio(_THIS);
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62 static void ALSA_PlayAudio(_THIS);
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63 static Uint8 *ALSA_GetAudioBuf(_THIS);
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64 static void ALSA_CloseAudio(_THIS);
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65
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66 #ifdef ALSA_DYNAMIC
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67
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68 static const char *alsa_library = ALSA_DYNAMIC;
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69 static void *alsa_handle = NULL;
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70 static int alsa_loaded = 0;
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71
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72 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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73 static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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74 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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75 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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76 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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77 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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78 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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79 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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80 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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81 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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82 static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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83 static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
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84 static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
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85 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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86 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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87 static snd_pcm_uframes_t (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int *dir);
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88 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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89 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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90 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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91 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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92
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93 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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94 static struct {
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95 const char *name;
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96 void **func;
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97 } alsa_functions[] = {
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98 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) },
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99 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) },
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100 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) },
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101 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) },
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102 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) },
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103 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) },
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104 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) },
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105 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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106 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) },
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107 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) },
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108 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) },
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109 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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110 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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111 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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112 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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113 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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114 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) },
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115 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) },
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116 };
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117
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118 static void UnloadALSALibrary(void) {
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119 if (alsa_loaded) {
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120 /* SDL_UnloadObject(alsa_handle);*/
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121 dlclose(alsa_handle);
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122 alsa_handle = NULL;
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123 alsa_loaded = 0;
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124 }
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125 }
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126
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127 static int LoadALSALibrary(void) {
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128 int i, retval = -1;
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129
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130 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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131 alsa_handle = dlopen(alsa_library,RTLD_NOW);
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132 if (alsa_handle) {
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133 alsa_loaded = 1;
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134 retval = 0;
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135 for (i = 0; i < SDL_TABLESIZE(alsa_functions); i++) {
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136 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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137 #ifdef USE_DLVSYM
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138 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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139 if (!*alsa_functions[i].func)
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140 #endif
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141 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
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142 if (!*alsa_functions[i].func) {
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143 retval = -1;
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144 UnloadALSALibrary();
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145 break;
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146 }
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147 }
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148 }
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149 return retval;
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150 }
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151
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152 #else
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153
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154 static void UnloadALSALibrary(void) {
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155 return;
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156 }
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157
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158 static int LoadALSALibrary(void) {
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159 return 0;
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160 }
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161
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162 #endif /* ALSA_DYNAMIC */
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163
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164 static const char *get_audio_device(int channels)
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165 {
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166 const char *device;
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167
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168 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
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169 if ( device == NULL ) {
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170 if (channels == 6) device = "surround51";
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171 else if (channels == 4) device = "surround40";
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172 else device = DEFAULT_DEVICE;
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173 }
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174 return device;
0
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175 }
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176
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177 /* Audio driver bootstrap functions */
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178
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179 static int Audio_Available(void)
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180 {
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181 int available;
354
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182 int status;
0
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183 snd_pcm_t *handle;
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184
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185 available = 0;
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186 if (LoadALSALibrary() < 0) {
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187 return available;
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188 }
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189 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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190 if ( status >= 0 ) {
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191 available = 1;
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192 SDL_NAME(snd_pcm_close)(handle);
0
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193 }
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194 UnloadALSALibrary();
0
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195 return(available);
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196 }
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197
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198 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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199 {
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200 SDL_free(device->hidden);
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201 SDL_free(device);
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202 UnloadALSALibrary();
0
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203 }
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204
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205 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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206 {
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207 SDL_AudioDevice *this;
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208
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209 /* Initialize all variables that we clean on shutdown */
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210 LoadALSALibrary();
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211 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0
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212 if ( this ) {
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213 SDL_memset(this, 0, (sizeof *this));
0
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214 this->hidden = (struct SDL_PrivateAudioData *)
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215 SDL_malloc((sizeof *this->hidden));
0
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diff changeset
216 }
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diff changeset
217 if ( (this == NULL) || (this->hidden == NULL) ) {
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diff changeset
218 SDL_OutOfMemory();
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219 if ( this ) {
1336
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220 SDL_free(this);
0
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diff changeset
221 }
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diff changeset
222 return(0);
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diff changeset
223 }
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diff changeset
224 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
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diff changeset
225
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226 /* Set the function pointers */
354
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diff changeset
227 this->OpenAudio = ALSA_OpenAudio;
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diff changeset
228 this->WaitAudio = ALSA_WaitAudio;
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diff changeset
229 this->PlayAudio = ALSA_PlayAudio;
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diff changeset
230 this->GetAudioBuf = ALSA_GetAudioBuf;
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diff changeset
231 this->CloseAudio = ALSA_CloseAudio;
0
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232
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233 this->free = Audio_DeleteDevice;
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diff changeset
234
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235 return this;
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diff changeset
236 }
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237
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238 AudioBootStrap ALSA_bootstrap = {
354
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diff changeset
239 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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diff changeset
240 Audio_Available, Audio_CreateDevice
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diff changeset
241 };
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242
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243 /* This function waits until it is possible to write a full sound buffer */
354
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diff changeset
244 static void ALSA_WaitAudio(_THIS)
0
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diff changeset
245 {
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diff changeset
246 /* Check to see if the thread-parent process is still alive */
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diff changeset
247 { static int cnt = 0;
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diff changeset
248 /* Note that this only works with thread implementations
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diff changeset
249 that use a different process id for each thread.
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diff changeset
250 */
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parents:
diff changeset
251 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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parents:
diff changeset
252 if ( kill(parent, 0) < 0 ) {
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diff changeset
253 this->enabled = 0;
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diff changeset
254 }
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diff changeset
255 }
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256 }
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257 }
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258
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diff changeset
259 static void ALSA_PlayAudio(_THIS)
0
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260 {
354
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diff changeset
261 int status;
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diff changeset
262 int sample_len;
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diff changeset
263 signed short *sample_buf;
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
264
354
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diff changeset
265 sample_len = this->spec.samples;
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diff changeset
266 sample_buf = (signed short *)mixbuf;
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diff changeset
267 while ( sample_len > 0 ) {
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268 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354
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diff changeset
269 if ( status < 0 ) {
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diff changeset
270 if ( status == -EAGAIN ) {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
271 SDL_Delay(1);
354
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diff changeset
272 continue;
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diff changeset
273 }
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diff changeset
274 if ( status == -ESTRPIPE ) {
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diff changeset
275 do {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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parents: 547
diff changeset
276 SDL_Delay(1);
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diff changeset
277 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
278 } while ( status == -EAGAIN );
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
279 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
280 if ( status < 0 ) {
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diff changeset
281 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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diff changeset
282 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
283 if ( status < 0 ) {
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diff changeset
284 /* Hmm, not much we can do - abort */
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diff changeset
285 this->enabled = 0;
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diff changeset
286 return;
0
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diff changeset
287 }
356
a1e54d1ba16f *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 354
diff changeset
288 continue;
0
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parents:
diff changeset
289 }
354
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diff changeset
290 sample_buf += status * this->spec.channels;
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diff changeset
291 sample_len -= status;
0
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diff changeset
292 }
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293 }
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diff changeset
294
354
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diff changeset
295 static Uint8 *ALSA_GetAudioBuf(_THIS)
0
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diff changeset
296 {
354
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diff changeset
297 return(mixbuf);
0
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diff changeset
298 }
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diff changeset
299
354
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diff changeset
300 static void ALSA_CloseAudio(_THIS)
0
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diff changeset
301 {
354
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diff changeset
302 if ( mixbuf != NULL ) {
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diff changeset
303 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
304 mixbuf = NULL;
0
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diff changeset
305 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
306 if ( pcm_handle ) {
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diff changeset
307 SDL_NAME(snd_pcm_drain)(pcm_handle);
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diff changeset
308 SDL_NAME(snd_pcm_close)(pcm_handle);
354
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diff changeset
309 pcm_handle = NULL;
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310 }
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311 }
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diff changeset
312
354
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diff changeset
313 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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diff changeset
314 {
354
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diff changeset
315 int status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
316 snd_pcm_hw_params_t *params;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
317 snd_pcm_format_t format;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
318 snd_pcm_uframes_t frames;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
319 Uint16 test_format;
0
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320
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321 /* Open the audio device */
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
diff changeset
322 /* Name of device should depend on # channels in spec */
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
diff changeset
323 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
diff changeset
324
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
325 if ( status < 0 ) {
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diff changeset
326 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
327 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
328 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
329
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
330 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
331 snd_pcm_hw_params_alloca(&params);
865
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diff changeset
332 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
333 if ( status < 0 ) {
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diff changeset
334 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
335 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
336 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
337 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
338
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
339 /* SDL only uses interleaved sample output */
865
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diff changeset
340 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
341 if ( status < 0 ) {
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diff changeset
342 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
343 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
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344 return(-1);
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diff changeset
345 }
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diff changeset
346
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diff changeset
347 /* Try for a closest match on audio format */
354
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diff changeset
348 status = -1;
0
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diff changeset
349 for ( test_format = SDL_FirstAudioFormat(spec->format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
350 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
351 switch ( test_format ) {
0
74212992fb08 Initial revision
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diff changeset
352 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
353 format = SND_PCM_FORMAT_U8;
0
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parents:
diff changeset
354 break;
74212992fb08 Initial revision
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diff changeset
355 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
356 format = SND_PCM_FORMAT_S8;
0
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parents:
diff changeset
357 break;
74212992fb08 Initial revision
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diff changeset
358 case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
359 format = SND_PCM_FORMAT_S16_LE;
0
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parents:
diff changeset
360 break;
74212992fb08 Initial revision
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parents:
diff changeset
361 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
362 format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
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parents:
diff changeset
363 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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diff changeset
364 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
365 format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
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parents:
diff changeset
366 break;
74212992fb08 Initial revision
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parents:
diff changeset
367 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
368 format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
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parents:
diff changeset
369 break;
74212992fb08 Initial revision
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parents:
diff changeset
370 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
371 format = 0;
0
74212992fb08 Initial revision
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parents:
diff changeset
372 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
373 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
374 if ( format != 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
375 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
376 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
377 if ( status < 0 ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
378 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
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parents:
diff changeset
379 }
74212992fb08 Initial revision
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parents:
diff changeset
380 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
381 if ( status < 0 ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
382 SDL_SetError("Couldn't find any hardware audio formats");
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
383 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
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parents:
diff changeset
384 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 spec->format = test_format;
74212992fb08 Initial revision
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parents:
diff changeset
387
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
388 /* Set the number of channels */
865
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parents: 769
diff changeset
389 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, params, spec->channels);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
390 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
391 status = SDL_NAME(snd_pcm_hw_params_get_channels)(params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
392 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
393 SDL_SetError("Couldn't set audio channels");
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
394 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
395 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
396 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
397 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
398 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
400 /* Set the audio rate */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
401 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, params, spec->freq, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
402 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
403 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
404 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
405 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
406 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
407 spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
409 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
410 frames = spec->samples;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
411 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, params, frames, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
412 spec->samples = frames;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
413 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, params, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
414
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
415 /* "set" the hardware with the desired parameters */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
416 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
417 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
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418 SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
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419 ALSA_CloseAudio(this);
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420 return(-1);
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421 }
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422
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423 /* Calculate the final parameters for this audio specification */
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424 SDL_CalculateAudioSpec(spec);
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425
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426 /* Allocate mixing buffer */
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427 mixlen = spec->size;
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428 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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429 if ( mixbuf == NULL ) {
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430 ALSA_CloseAudio(this);
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431 return(-1);
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432 }
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433 SDL_memset(mixbuf, spec->silence, spec->size);
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434
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435 /* Get the parent process id (we're the parent of the audio thread) */
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436 parent = getpid();
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437
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438 /* Switch to blocking mode for playback */
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439 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
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440
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441 /* We're ready to rock and roll. :-) */
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442 return(0);
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443 }