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annotate src/audio/alsa/SDL_alsa_audio.c @ 974:b8427b5151ed

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Restore the user specified window proc after shutdown
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Nov 2004 21:09:54 +0000
parents 41a59de7f2ed
children 05d4b93b911e
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 <stdlib.h>
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28 #include <stdio.h>
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29 #include <string.h>
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <signal.h>
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34 #include <sys/types.h>
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35 #include <sys/time.h>
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36
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37 #include "SDL_audio.h"
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38 #include "SDL_error.h"
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39 #include "SDL_audiomem.h"
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40 #include "SDL_audio_c.h"
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41 #include "SDL_timer.h"
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42 #include "SDL_alsa_audio.h"
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43
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44 #ifdef ALSA_DYNAMIC
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45 #ifdef USE_DLVSYM
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46 #define __USE_GNU
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47 #endif
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48 #include <dlfcn.h>
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49 #include "SDL_name.h"
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50 #include "SDL_loadso.h"
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51 #else
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52 #define SDL_NAME(X) X
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53 #endif
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54
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55
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56 /* The tag name used by ALSA audio */
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57 #define DRIVER_NAME "alsa"
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58
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59 /* The default ALSA audio driver */
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60 #define DEFAULT_DEVICE "default"
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61
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62 /* Audio driver functions */
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63 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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64 static void ALSA_WaitAudio(_THIS);
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65 static void ALSA_PlayAudio(_THIS);
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66 static Uint8 *ALSA_GetAudioBuf(_THIS);
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67 static void ALSA_CloseAudio(_THIS);
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68
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69 #ifdef ALSA_DYNAMIC
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70
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71 static const char *alsa_library = ALSA_DYNAMIC;
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72 static void *alsa_handle = NULL;
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73 static int alsa_loaded = 0;
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74
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75 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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76 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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77 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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78 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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79 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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80 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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81 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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82 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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83 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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84 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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85 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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86 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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87 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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88 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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89 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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90 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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91 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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92 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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93 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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94 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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95
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96 static struct {
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97 const char *name;
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98 void **func;
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99 } alsa_functions[] = {
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100 { "snd_pcm_open", (void**)&SDL_NAME(snd_pcm_open) },
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101 { "snd_pcm_close", (void**)&SDL_NAME(snd_pcm_close) },
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102 { "snd_pcm_writei", (void**)&SDL_NAME(snd_pcm_writei) },
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103 { "snd_pcm_resume", (void**)&SDL_NAME(snd_pcm_resume) },
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104 { "snd_pcm_prepare", (void**)&SDL_NAME(snd_pcm_prepare) },
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105 { "snd_pcm_drain", (void**)&SDL_NAME(snd_pcm_drain) },
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106 { "snd_strerror", (void**)&SDL_NAME(snd_strerror) },
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107 { "snd_pcm_hw_params_sizeof", (void**)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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108 { "snd_pcm_hw_params_any", (void**)&SDL_NAME(snd_pcm_hw_params_any) },
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109 { "snd_pcm_hw_params_set_access", (void**)&SDL_NAME(snd_pcm_hw_params_set_access) },
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110 { "snd_pcm_hw_params_set_format", (void**)&SDL_NAME(snd_pcm_hw_params_set_format) },
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111 { "snd_pcm_hw_params_set_channels", (void**)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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112 { "snd_pcm_hw_params_get_channels", (void**)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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113 { "snd_pcm_hw_params_set_rate_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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114 { "snd_pcm_hw_params_set_period_size_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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115 { "snd_pcm_hw_params_set_periods_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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116 { "snd_pcm_hw_params", (void**)&SDL_NAME(snd_pcm_hw_params) },
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117 { "snd_pcm_nonblock", (void**)&SDL_NAME(snd_pcm_nonblock) },
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118 };
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119
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120 static void UnloadALSALibrary(void) {
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121 if (alsa_loaded) {
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122 /* SDL_UnloadObject(alsa_handle);*/
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123 dlclose(alsa_handle);
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124 alsa_handle = NULL;
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125 alsa_loaded = 0;
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126 }
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127 }
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128
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129 static int LoadALSALibrary(void) {
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130 int i, retval = -1;
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131
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132 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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133 alsa_handle = dlopen(alsa_library,RTLD_NOW);
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134 if (alsa_handle) {
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135 alsa_loaded = 1;
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136 retval = 0;
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137 for (i = 0; i < SDL_TABLESIZE(alsa_functions); i++) {
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138 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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139 #ifdef USE_DLVSYM
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140 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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141 if (!*alsa_functions[i].func)
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142 #endif
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143 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
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144 if (!*alsa_functions[i].func) {
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145 retval = -1;
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146 UnloadALSALibrary();
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147 break;
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148 }
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149 }
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150 }
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151 return retval;
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152 }
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153
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154 #else
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155
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156 static void UnloadALSALibrary(void) {
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157 return;
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158 }
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159
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160 static int LoadALSALibrary(void) {
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161 return 0;
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162 }
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163
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164 #endif /* ALSA_DYNAMIC */
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165
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166 static const char *get_audio_device(int channels)
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167 {
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168 const char *device;
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169
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170 device = getenv("AUDIODEV"); /* Is there a standard variable name? */
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171 if ( device == NULL ) {
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172 if (channels == 6) device = "surround51";
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173 else if (channels == 4) device = "surround40";
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174 else device = DEFAULT_DEVICE;
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175 }
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176 return device;
0
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177 }
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178
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179 /* Audio driver bootstrap functions */
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180
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181 static int Audio_Available(void)
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182 {
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183 int available;
354
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184 int status;
0
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185 snd_pcm_t *handle;
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186
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187 available = 0;
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188 if (LoadALSALibrary() < 0) {
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189 return available;
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190 }
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191 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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192 if ( status >= 0 ) {
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193 available = 1;
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194 SDL_NAME(snd_pcm_close)(handle);
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195 }
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196 UnloadALSALibrary();
0
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197 return(available);
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198 }
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199
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200 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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201 {
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202 free(device->hidden);
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203 free(device);
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204 UnloadALSALibrary();
0
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205 }
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206
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207 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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208 {
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209 SDL_AudioDevice *this;
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210
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211 /* Initialize all variables that we clean on shutdown */
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212 LoadALSALibrary();
0
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213 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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214 if ( this ) {
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215 memset(this, 0, (sizeof *this));
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216 this->hidden = (struct SDL_PrivateAudioData *)
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217 malloc((sizeof *this->hidden));
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218 }
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219 if ( (this == NULL) || (this->hidden == NULL) ) {
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220 SDL_OutOfMemory();
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221 if ( this ) {
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222 free(this);
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diff changeset
223 }
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224 return(0);
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225 }
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226 memset(this->hidden, 0, (sizeof *this->hidden));
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227
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228 /* Set the function pointers */
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diff changeset
229 this->OpenAudio = ALSA_OpenAudio;
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diff changeset
230 this->WaitAudio = ALSA_WaitAudio;
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231 this->PlayAudio = ALSA_PlayAudio;
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232 this->GetAudioBuf = ALSA_GetAudioBuf;
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233 this->CloseAudio = ALSA_CloseAudio;
0
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234
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235 this->free = Audio_DeleteDevice;
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236
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237 return this;
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238 }
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239
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240 AudioBootStrap ALSA_bootstrap = {
354
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diff changeset
241 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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diff changeset
242 Audio_Available, Audio_CreateDevice
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diff changeset
243 };
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244
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245 /* This function waits until it is possible to write a full sound buffer */
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diff changeset
246 static void ALSA_WaitAudio(_THIS)
0
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diff changeset
247 {
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diff changeset
248 /* Check to see if the thread-parent process is still alive */
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249 { static int cnt = 0;
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diff changeset
250 /* Note that this only works with thread implementations
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diff changeset
251 that use a different process id for each thread.
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252 */
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diff changeset
253 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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diff changeset
254 if ( kill(parent, 0) < 0 ) {
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diff changeset
255 this->enabled = 0;
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diff changeset
256 }
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257 }
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258 }
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259 }
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diff changeset
260
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diff changeset
261 static void ALSA_PlayAudio(_THIS)
0
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262 {
354
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diff changeset
263 int status;
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diff changeset
264 int sample_len;
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diff changeset
265 signed short *sample_buf;
765
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diff changeset
266
354
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diff changeset
267 sample_len = this->spec.samples;
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diff changeset
268 sample_buf = (signed short *)mixbuf;
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diff changeset
269 while ( sample_len > 0 ) {
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270 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354
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diff changeset
271 if ( status < 0 ) {
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diff changeset
272 if ( status == -EAGAIN ) {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
273 SDL_Delay(1);
354
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diff changeset
274 continue;
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diff changeset
275 }
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diff changeset
276 if ( status == -ESTRPIPE ) {
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diff changeset
277 do {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
278 SDL_Delay(1);
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diff changeset
279 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
280 } while ( status == -EAGAIN );
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diff changeset
281 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
282 if ( status < 0 ) {
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diff changeset
283 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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parents: 297
diff changeset
284 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
285 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
286 /* Hmm, not much we can do - abort */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
287 this->enabled = 0;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
288 return;
0
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parents:
diff changeset
289 }
356
a1e54d1ba16f *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 354
diff changeset
290 continue;
0
74212992fb08 Initial revision
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parents:
diff changeset
291 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
292 sample_buf += status * this->spec.channels;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
293 sample_len -= status;
0
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parents:
diff changeset
294 }
74212992fb08 Initial revision
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parents:
diff changeset
295 }
74212992fb08 Initial revision
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parents:
diff changeset
296
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
297 static Uint8 *ALSA_GetAudioBuf(_THIS)
0
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parents:
diff changeset
298 {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
299 return(mixbuf);
0
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parents:
diff changeset
300 }
74212992fb08 Initial revision
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parents:
diff changeset
301
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
302 static void ALSA_CloseAudio(_THIS)
0
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parents:
diff changeset
303 {
354
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diff changeset
304 if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
305 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
306 mixbuf = NULL;
0
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parents:
diff changeset
307 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
308 if ( pcm_handle ) {
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parents: 769
diff changeset
309 SDL_NAME(snd_pcm_drain)(pcm_handle);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
310 SDL_NAME(snd_pcm_close)(pcm_handle);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
311 pcm_handle = NULL;
0
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parents:
diff changeset
312 }
74212992fb08 Initial revision
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parents:
diff changeset
313 }
74212992fb08 Initial revision
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parents:
diff changeset
314
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
315 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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diff changeset
316 {
354
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diff changeset
317 int status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
318 snd_pcm_hw_params_t *params;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
319 snd_pcm_format_t format;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
320 snd_pcm_uframes_t frames;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
321 Uint16 test_format;
0
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diff changeset
322
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diff changeset
323 /* Open the audio device */
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
324 /* Name of device should depend on # channels in spec */
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
325 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
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
326
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
327 if ( status < 0 ) {
865
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diff changeset
328 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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parents: 297
diff changeset
329 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
330 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
331
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
332 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
333 snd_pcm_hw_params_alloca(&params);
865
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parents: 769
diff changeset
334 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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parents: 297
diff changeset
335 if ( status < 0 ) {
865
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parents: 769
diff changeset
336 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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parents: 297
diff changeset
337 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
338 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
339 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
340
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
341 /* SDL only uses interleaved sample output */
865
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diff changeset
342 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
343 if ( status < 0 ) {
865
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diff changeset
344 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
345 ALSA_CloseAudio(this);
0
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diff changeset
346 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
347 }
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parents:
diff changeset
348
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diff changeset
349 /* Try for a closest match on audio format */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
350 status = -1;
0
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parents:
diff changeset
351 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
352 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
353 switch ( test_format ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
354 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
355 format = SND_PCM_FORMAT_U8;
0
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parents:
diff changeset
356 break;
74212992fb08 Initial revision
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parents:
diff changeset
357 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
358 format = SND_PCM_FORMAT_S8;
0
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parents:
diff changeset
359 break;
74212992fb08 Initial revision
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parents:
diff changeset
360 case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
361 format = SND_PCM_FORMAT_S16_LE;
0
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parents:
diff changeset
362 break;
74212992fb08 Initial revision
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parents:
diff changeset
363 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
364 format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
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parents:
diff changeset
365 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
366 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
367 format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
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parents:
diff changeset
368 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
369 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
370 format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
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parents:
diff changeset
371 break;
74212992fb08 Initial revision
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parents:
diff changeset
372 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
373 format = 0;
0
74212992fb08 Initial revision
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parents:
diff changeset
374 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
375 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
376 if ( format != 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
377 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
378 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
379 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
380 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
381 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
382 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
383 if ( status < 0 ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
384 SDL_SetError("Couldn't find any hardware audio formats");
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
385 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388 spec->format = test_format;
74212992fb08 Initial revision
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parents:
diff changeset
389
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
390 /* Set the number of channels */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
391 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
392 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
393 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
394 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
395 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
396 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
397 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
398 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
399 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
400 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
402 /* Set the audio rate */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
403 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
404 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
405 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
406 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
407 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
408 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
409 spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
411 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
412 frames = spec->samples;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
413 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
414 spec->samples = frames;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
415 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
416
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
417 /* "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
418 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
419 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
420 SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
421 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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425 /* Calculate the final parameters for this audio specification */
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426 SDL_CalculateAudioSpec(spec);
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427
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428 /* Allocate mixing buffer */
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429 mixlen = spec->size;
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430 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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431 if ( mixbuf == NULL ) {
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432 ALSA_CloseAudio(this);
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433 return(-1);
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434 }
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435 memset(mixbuf, spec->silence, spec->size);
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436
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437 /* Get the parent process id (we're the parent of the audio thread) */
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438 parent = getpid();
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439
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440 /* Switch to blocking mode for playback */
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441 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
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442
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443 /* We're ready to rock and roll. :-) */
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444 return(0);
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445 }