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annotate src/audio/alsa/SDL_alsa_audio.c @ 1379:c0a74f199ecf

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Use only safe string functions
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Feb 2006 23:46:34 +0000
parents 19418e4422cb
children d910939febfa
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_timer.h"
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31 #include "SDL_audio.h"
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32 #include "../SDL_audiomem.h"
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33 #include "../SDL_audio_c.h"
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34 #include "SDL_alsa_audio.h"
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35
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36 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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37 #include <dlfcn.h>
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38 #include "SDL_name.h"
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39 #include "SDL_loadso.h"
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40 #else
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41 #define SDL_NAME(X) X
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42 #endif
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43
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44
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45 /* The tag name used by ALSA audio */
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46 #define DRIVER_NAME "alsa"
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47
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48 /* The default ALSA audio driver */
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49 #define DEFAULT_DEVICE "default"
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50
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51 /* Audio driver functions */
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52 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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53 static void ALSA_WaitAudio(_THIS);
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54 static void ALSA_PlayAudio(_THIS);
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55 static Uint8 *ALSA_GetAudioBuf(_THIS);
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56 static void ALSA_CloseAudio(_THIS);
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57
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58 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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59
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60 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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61 static void *alsa_handle = NULL;
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62 static int alsa_loaded = 0;
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63
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64 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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65 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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66 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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67 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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68 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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69 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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70 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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71 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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72 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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73 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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74 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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75 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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76 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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77 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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78 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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79 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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80 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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81 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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82 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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83 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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84
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85 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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86 static struct {
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87 const char *name;
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88 void **func;
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89 } alsa_functions[] = {
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90 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) },
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91 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) },
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92 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) },
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93 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) },
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94 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) },
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95 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) },
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96 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) },
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97 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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98 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) },
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99 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) },
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100 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) },
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101 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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102 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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103 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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104 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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105 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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106 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) },
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107 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) },
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108 };
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109
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110 static void UnloadALSALibrary(void) {
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111 if (alsa_loaded) {
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112 /* SDL_UnloadObject(alsa_handle);*/
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113 dlclose(alsa_handle);
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114 alsa_handle = NULL;
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115 alsa_loaded = 0;
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116 }
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117 }
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118
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119 static int LoadALSALibrary(void) {
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120 int i, retval = -1;
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121
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122 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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123 alsa_handle = dlopen(alsa_library,RTLD_NOW);
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124 if (alsa_handle) {
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125 alsa_loaded = 1;
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126 retval = 0;
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127 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
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128 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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129 #if HAVE_DLVSYM
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130 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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131 if (!*alsa_functions[i].func)
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132 #endif
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133 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
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134 if (!*alsa_functions[i].func) {
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135 retval = -1;
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136 UnloadALSALibrary();
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137 break;
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138 }
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139 }
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140 }
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141 return retval;
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142 }
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143
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144 #else
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145
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146 static void UnloadALSALibrary(void) {
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147 return;
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148 }
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149
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150 static int LoadALSALibrary(void) {
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151 return 0;
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152 }
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153
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154 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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155
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156 static const char *get_audio_device(int channels)
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157 {
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158 const char *device;
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159
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160 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
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161 if ( device == NULL ) {
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162 if (channels == 6) device = "surround51";
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163 else if (channels == 4) device = "surround40";
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164 else device = DEFAULT_DEVICE;
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165 }
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166 return device;
0
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167 }
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168
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169 /* Audio driver bootstrap functions */
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170
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171 static int Audio_Available(void)
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172 {
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173 int available;
354
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174 int status;
0
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175 snd_pcm_t *handle;
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176
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177 available = 0;
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178 if (LoadALSALibrary() < 0) {
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179 return available;
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180 }
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181 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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diff changeset
182 if ( status >= 0 ) {
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183 available = 1;
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184 SDL_NAME(snd_pcm_close)(handle);
0
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185 }
865
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186 UnloadALSALibrary();
0
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187 return(available);
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188 }
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189
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190 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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191 {
1336
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192 SDL_free(device->hidden);
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193 SDL_free(device);
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194 UnloadALSALibrary();
0
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195 }
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196
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197 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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198 {
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199 SDL_AudioDevice *this;
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200
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201 /* Initialize all variables that we clean on shutdown */
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202 LoadALSALibrary();
1336
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203 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0
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204 if ( this ) {
1336
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205 SDL_memset(this, 0, (sizeof *this));
0
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parents:
diff changeset
206 this->hidden = (struct SDL_PrivateAudioData *)
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
207 SDL_malloc((sizeof *this->hidden));
0
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diff changeset
208 }
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parents:
diff changeset
209 if ( (this == NULL) || (this->hidden == NULL) ) {
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parents:
diff changeset
210 SDL_OutOfMemory();
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parents:
diff changeset
211 if ( this ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
212 SDL_free(this);
0
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parents:
diff changeset
213 }
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diff changeset
214 return(0);
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parents:
diff changeset
215 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
216 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
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parents:
diff changeset
217
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diff changeset
218 /* Set the function pointers */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
219 this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
220 this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
221 this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
222 this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
223 this->CloseAudio = ALSA_CloseAudio;
0
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parents:
diff changeset
224
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diff changeset
225 this->free = Audio_DeleteDevice;
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parents:
diff changeset
226
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diff changeset
227 return this;
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parents:
diff changeset
228 }
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diff changeset
229
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parents:
diff changeset
230 AudioBootStrap ALSA_bootstrap = {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
231 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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parents:
diff changeset
232 Audio_Available, Audio_CreateDevice
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parents:
diff changeset
233 };
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diff changeset
234
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diff changeset
235 /* This function waits until it is possible to write a full sound buffer */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
236 static void ALSA_WaitAudio(_THIS)
0
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parents:
diff changeset
237 {
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parents:
diff changeset
238 /* Check to see if the thread-parent process is still alive */
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parents:
diff changeset
239 { static int cnt = 0;
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parents:
diff changeset
240 /* Note that this only works with thread implementations
74212992fb08 Initial revision
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parents:
diff changeset
241 that use a different process id for each thread.
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parents:
diff changeset
242 */
74212992fb08 Initial revision
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parents:
diff changeset
243 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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parents:
diff changeset
244 if ( kill(parent, 0) < 0 ) {
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parents:
diff changeset
245 this->enabled = 0;
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parents:
diff changeset
246 }
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diff changeset
247 }
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248 }
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diff changeset
249 }
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diff changeset
250
354
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diff changeset
251 static void ALSA_PlayAudio(_THIS)
0
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diff changeset
252 {
354
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diff changeset
253 int status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
254 int sample_len;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
255 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
256
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
257 sample_len = this->spec.samples;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
258 sample_buf = (signed short *)mixbuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
259 while ( sample_len > 0 ) {
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diff changeset
260 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354
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diff changeset
261 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
262 if ( status == -EAGAIN ) {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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parents: 547
diff changeset
263 SDL_Delay(1);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
264 continue;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
265 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
266 if ( status == -ESTRPIPE ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
267 do {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
268 SDL_Delay(1);
865
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diff changeset
269 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
270 } while ( status == -EAGAIN );
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
271 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
272 if ( status < 0 ) {
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diff changeset
273 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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diff changeset
274 }
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diff changeset
275 if ( status < 0 ) {
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diff changeset
276 /* Hmm, not much we can do - abort */
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diff changeset
277 this->enabled = 0;
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diff changeset
278 return;
0
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diff changeset
279 }
356
a1e54d1ba16f *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 354
diff changeset
280 continue;
0
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parents:
diff changeset
281 }
354
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diff changeset
282 sample_buf += status * this->spec.channels;
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diff changeset
283 sample_len -= status;
0
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diff changeset
284 }
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parents:
diff changeset
285 }
74212992fb08 Initial revision
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parents:
diff changeset
286
354
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diff changeset
287 static Uint8 *ALSA_GetAudioBuf(_THIS)
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diff changeset
288 {
354
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diff changeset
289 return(mixbuf);
0
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parents:
diff changeset
290 }
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diff changeset
291
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
292 static void ALSA_CloseAudio(_THIS)
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diff changeset
293 {
354
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diff changeset
294 if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
295 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
296 mixbuf = NULL;
0
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diff changeset
297 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
298 if ( pcm_handle ) {
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diff changeset
299 SDL_NAME(snd_pcm_drain)(pcm_handle);
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diff changeset
300 SDL_NAME(snd_pcm_close)(pcm_handle);
354
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diff changeset
301 pcm_handle = NULL;
0
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parents:
diff changeset
302 }
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parents:
diff changeset
303 }
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304
354
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diff changeset
305 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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diff changeset
306 {
354
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diff changeset
307 int status;
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diff changeset
308 snd_pcm_hw_params_t *params;
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diff changeset
309 snd_pcm_format_t format;
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diff changeset
310 snd_pcm_uframes_t frames;
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diff changeset
311 Uint16 test_format;
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312
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313 /* 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
314 /* 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
315 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
316
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
317 if ( status < 0 ) {
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diff changeset
318 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
319 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
320 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
321
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
322 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
323 snd_pcm_hw_params_alloca(&params);
865
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parents: 769
diff changeset
324 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
325 if ( status < 0 ) {
865
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diff changeset
326 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
327 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
328 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
329 }
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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diff changeset
331 /* SDL only uses interleaved sample output */
865
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diff changeset
332 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
333 if ( status < 0 ) {
865
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diff changeset
334 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
335 ALSA_CloseAudio(this);
0
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336 return(-1);
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diff changeset
337 }
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diff changeset
338
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diff changeset
339 /* Try for a closest match on audio format */
354
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diff changeset
340 status = -1;
0
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diff changeset
341 for ( test_format = SDL_FirstAudioFormat(spec->format);
354
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parents: 297
diff changeset
342 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
343 switch ( test_format ) {
0
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diff changeset
344 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
345 format = SND_PCM_FORMAT_U8;
0
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diff changeset
346 break;
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diff changeset
347 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
348 format = SND_PCM_FORMAT_S8;
0
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diff changeset
349 break;
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diff changeset
350 case AUDIO_S16LSB:
354
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diff changeset
351 format = SND_PCM_FORMAT_S16_LE;
0
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parents:
diff changeset
352 break;
74212992fb08 Initial revision
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diff changeset
353 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
354 format = SND_PCM_FORMAT_S16_BE;
0
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parents:
diff changeset
355 break;
74212992fb08 Initial revision
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diff changeset
356 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
357 format = SND_PCM_FORMAT_U16_LE;
0
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parents:
diff changeset
358 break;
74212992fb08 Initial revision
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diff changeset
359 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
360 format = SND_PCM_FORMAT_U16_BE;
0
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parents:
diff changeset
361 break;
74212992fb08 Initial revision
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parents:
diff changeset
362 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
363 format = 0;
0
74212992fb08 Initial revision
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parents:
diff changeset
364 break;
74212992fb08 Initial revision
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parents:
diff changeset
365 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
366 if ( format != 0 ) {
865
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parents: 769
diff changeset
367 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
368 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
369 if ( status < 0 ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
370 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
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parents:
diff changeset
371 }
74212992fb08 Initial revision
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parents:
diff changeset
372 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
373 if ( status < 0 ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
374 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
375 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
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parents:
diff changeset
376 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 }
74212992fb08 Initial revision
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parents:
diff changeset
378 spec->format = test_format;
74212992fb08 Initial revision
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parents:
diff changeset
379
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
380 /* Set the number of channels */
865
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parents: 769
diff changeset
381 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
382 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
383 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
384 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
385 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
386 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
387 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
388 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
389 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
390 }
0
74212992fb08 Initial revision
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parents:
diff changeset
391
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
392 /* Set the audio rate */
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_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
394 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
395 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
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
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parents: 297
diff changeset
399 spec->freq = status;
0
74212992fb08 Initial revision
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parents:
diff changeset
400
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
401 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
402 frames = spec->samples;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
403 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
404 spec->samples = frames;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
405 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
406
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
407 /* "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
408 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
409 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
410 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
411 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
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parents:
diff changeset
412 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
415 /* Calculate the final parameters for this audio specification */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
416 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
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parents:
diff changeset
417
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
418 /* Allocate mixing buffer */
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419 mixlen = spec->size;
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420 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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421 if ( mixbuf == NULL ) {
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422 ALSA_CloseAudio(this);
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423 return(-1);
0
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424 }
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425 SDL_memset(mixbuf, spec->silence, spec->size);
0
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426
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427 /* Get the parent process id (we're the parent of the audio thread) */
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428 parent = getpid();
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429
765
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430 /* Switch to blocking mode for playback */
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431 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
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432
0
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433 /* We're ready to rock and roll. :-) */
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434 return(0);
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435 }