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annotate src/audio/alsa/SDL_alsa_audio.c @ 939:c7c04f811994

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Date: Tue, 01 Jun 2004 15:27:44 +0300 From: Martin_Storsj Subject: Update for dynamic loading of ALSA I sent you a patch a few months ago which enables SDL to load ALSA dynamically. Now I've finally got time to tweak this yet some more. I've added code from alsa.m4 (from alsa's dev package) to acinclude.m4, and made the detection of the alsa library name a bit better. I've also fixed up the loading versioned symbols with dlvsym, so that it falls back to dlsym. I wouldn't say the configure script is complete yet, but this is how far I've come this time, and I'm no expert at those things.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 04:20:00 +0000
parents 92615154bb68
children 41a59de7f2ed
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
354
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166 static const char *get_audio_device()
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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 device = DEFAULT_DEVICE;
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173 }
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174 return device;
0
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175 }
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176
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177 /* Audio driver bootstrap functions */
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178
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179 static int Audio_Available(void)
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180 {
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181 int available;
354
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182 int status;
0
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183 snd_pcm_t *handle;
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184
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185 available = 0;
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186 if (LoadALSALibrary() < 0) {
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187 return available;
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188 }
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189 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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190 if ( status >= 0 ) {
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191 available = 1;
865
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192 SDL_NAME(snd_pcm_close)(handle);
0
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193 }
865
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194 UnloadALSALibrary();
0
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195 return(available);
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196 }
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197
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198 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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199 {
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200 free(device->hidden);
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201 free(device);
865
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202 UnloadALSALibrary();
0
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203 }
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204
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205 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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206 {
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207 SDL_AudioDevice *this;
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208
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209 /* Initialize all variables that we clean on shutdown */
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210 LoadALSALibrary();
0
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211 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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212 if ( this ) {
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213 memset(this, 0, (sizeof *this));
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214 this->hidden = (struct SDL_PrivateAudioData *)
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215 malloc((sizeof *this->hidden));
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diff changeset
216 }
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217 if ( (this == NULL) || (this->hidden == NULL) ) {
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218 SDL_OutOfMemory();
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219 if ( this ) {
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220 free(this);
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diff changeset
221 }
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diff changeset
222 return(0);
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diff changeset
223 }
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diff changeset
224 memset(this->hidden, 0, (sizeof *this->hidden));
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diff changeset
225
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diff changeset
226 /* Set the function pointers */
354
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diff changeset
227 this->OpenAudio = ALSA_OpenAudio;
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diff changeset
228 this->WaitAudio = ALSA_WaitAudio;
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diff changeset
229 this->PlayAudio = ALSA_PlayAudio;
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diff changeset
230 this->GetAudioBuf = ALSA_GetAudioBuf;
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diff changeset
231 this->CloseAudio = ALSA_CloseAudio;
0
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diff changeset
232
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233 this->free = Audio_DeleteDevice;
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parents:
diff changeset
234
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235 return this;
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diff changeset
236 }
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237
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diff changeset
238 AudioBootStrap ALSA_bootstrap = {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
239 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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diff changeset
240 Audio_Available, Audio_CreateDevice
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diff changeset
241 };
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diff changeset
242
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diff changeset
243 /* 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
244 static void ALSA_WaitAudio(_THIS)
0
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diff changeset
245 {
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diff changeset
246 /* Check to see if the thread-parent process is still alive */
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diff changeset
247 { static int cnt = 0;
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parents:
diff changeset
248 /* Note that this only works with thread implementations
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parents:
diff changeset
249 that use a different process id for each thread.
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diff changeset
250 */
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parents:
diff changeset
251 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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parents:
diff changeset
252 if ( kill(parent, 0) < 0 ) {
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diff changeset
253 this->enabled = 0;
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parents:
diff changeset
254 }
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diff changeset
255 }
74212992fb08 Initial revision
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diff changeset
256 }
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diff changeset
257 }
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diff changeset
258
354
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diff changeset
259 static void ALSA_PlayAudio(_THIS)
0
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diff changeset
260 {
354
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diff changeset
261 int status;
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diff changeset
262 int sample_len;
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diff changeset
263 signed short *sample_buf;
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
264
354
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diff changeset
265 sample_len = this->spec.samples;
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diff changeset
266 sample_buf = (signed short *)mixbuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
267 while ( sample_len > 0 ) {
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diff changeset
268 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354
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diff changeset
269 if ( status < 0 ) {
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diff changeset
270 if ( status == -EAGAIN ) {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
271 SDL_Delay(1);
354
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diff changeset
272 continue;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
273 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
274 if ( status == -ESTRPIPE ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
275 do {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
276 SDL_Delay(1);
865
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diff changeset
277 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
278 } while ( status == -EAGAIN );
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
279 }
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diff changeset
280 if ( status < 0 ) {
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281 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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diff changeset
282 }
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diff changeset
283 if ( status < 0 ) {
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diff changeset
284 /* Hmm, not much we can do - abort */
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diff changeset
285 this->enabled = 0;
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diff changeset
286 return;
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287 }
356
a1e54d1ba16f *** empty log message ***
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diff changeset
288 continue;
0
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diff changeset
289 }
354
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diff changeset
290 sample_buf += status * this->spec.channels;
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diff changeset
291 sample_len -= status;
0
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292 }
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293 }
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294
354
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diff changeset
295 static Uint8 *ALSA_GetAudioBuf(_THIS)
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296 {
354
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diff changeset
297 return(mixbuf);
0
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298 }
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299
354
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diff changeset
300 static void ALSA_CloseAudio(_THIS)
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301 {
354
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diff changeset
302 if ( mixbuf != NULL ) {
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diff changeset
303 SDL_FreeAudioMem(mixbuf);
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diff changeset
304 mixbuf = NULL;
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305 }
354
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diff changeset
306 if ( pcm_handle ) {
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diff changeset
307 SDL_NAME(snd_pcm_drain)(pcm_handle);
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308 SDL_NAME(snd_pcm_close)(pcm_handle);
354
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diff changeset
309 pcm_handle = NULL;
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310 }
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311 }
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312
354
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diff changeset
313 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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314 {
354
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diff changeset
315 int status;
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diff changeset
316 snd_pcm_hw_params_t *params;
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diff changeset
317 snd_pcm_format_t format;
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diff changeset
318 snd_pcm_uframes_t frames;
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diff changeset
319 Uint16 test_format;
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320
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321 /* Open the audio device */
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322 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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diff changeset
323 if ( status < 0 ) {
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diff changeset
324 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
325 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
326 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
327
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diff changeset
328 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
329 snd_pcm_hw_params_alloca(&params);
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330 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, params);
354
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diff changeset
331 if ( status < 0 ) {
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diff changeset
332 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
333 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
334 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
335 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
336
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
337 /* SDL only uses interleaved sample output */
865
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diff changeset
338 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
354
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diff changeset
339 if ( status < 0 ) {
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diff changeset
340 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
341 ALSA_CloseAudio(this);
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342 return(-1);
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343 }
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344
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diff changeset
345 /* Try for a closest match on audio format */
354
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diff changeset
346 status = -1;
0
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347 for ( test_format = SDL_FirstAudioFormat(spec->format);
354
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diff changeset
348 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
349 switch ( test_format ) {
0
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350 case AUDIO_U8:
354
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diff changeset
351 format = SND_PCM_FORMAT_U8;
0
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352 break;
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353 case AUDIO_S8:
354
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diff changeset
354 format = SND_PCM_FORMAT_S8;
0
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diff changeset
355 break;
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356 case AUDIO_S16LSB:
354
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diff changeset
357 format = SND_PCM_FORMAT_S16_LE;
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diff changeset
358 break;
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diff changeset
359 case AUDIO_S16MSB:
354
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diff changeset
360 format = SND_PCM_FORMAT_S16_BE;
0
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parents:
diff changeset
361 break;
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diff changeset
362 case AUDIO_U16LSB:
354
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diff changeset
363 format = SND_PCM_FORMAT_U16_LE;
0
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parents:
diff changeset
364 break;
74212992fb08 Initial revision
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diff changeset
365 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
366 format = SND_PCM_FORMAT_U16_BE;
0
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parents:
diff changeset
367 break;
74212992fb08 Initial revision
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diff changeset
368 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
369 format = 0;
0
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diff changeset
370 break;
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parents:
diff changeset
371 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
372 if ( format != 0 ) {
865
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diff changeset
373 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
374 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
375 if ( status < 0 ) {
0
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diff changeset
376 test_format = SDL_NextAudioFormat();
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diff changeset
377 }
74212992fb08 Initial revision
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parents:
diff changeset
378 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
379 if ( status < 0 ) {
0
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diff changeset
380 SDL_SetError("Couldn't find any hardware audio formats");
354
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parents: 297
diff changeset
381 ALSA_CloseAudio(this);
0
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parents:
diff changeset
382 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
383 }
74212992fb08 Initial revision
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parents:
diff changeset
384 spec->format = test_format;
74212992fb08 Initial revision
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parents:
diff changeset
385
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
386 /* Set the number of channels */
865
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diff changeset
387 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, params, spec->channels);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
388 if ( status < 0 ) {
865
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diff changeset
389 status = SDL_NAME(snd_pcm_hw_params_get_channels)(params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
390 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
391 SDL_SetError("Couldn't set audio channels");
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
392 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
393 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
394 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
395 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
396 }
0
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parents:
diff changeset
397
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
398 /* Set the audio rate */
865
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parents: 769
diff changeset
399 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, params, spec->freq, NULL);
354
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parents: 297
diff changeset
400 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
401 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
402 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
403 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
404 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
405 spec->freq = status;
0
74212992fb08 Initial revision
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parents:
diff changeset
406
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
407 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
408 frames = spec->samples;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
409 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
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parents: 297
diff changeset
410 spec->samples = frames;
865
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parents: 769
diff changeset
411 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, params, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
412
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
413 /* "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
414 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
415 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
416 SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
417 ALSA_CloseAudio(this);
0
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parents:
diff changeset
418 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
419 }
74212992fb08 Initial revision
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parents:
diff changeset
420
354
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diff changeset
421 /* Calculate the final parameters for this audio specification */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
422 SDL_CalculateAudioSpec(spec);
0
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parents:
diff changeset
423
354
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diff changeset
424 /* Allocate mixing buffer */
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425 mixlen = spec->size;
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426 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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427 if ( mixbuf == NULL ) {
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428 ALSA_CloseAudio(this);
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429 return(-1);
0
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430 }
354
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431 memset(mixbuf, spec->silence, spec->size);
0
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parents:
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432
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433 /* Get the parent process id (we're the parent of the audio thread) */
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434 parent = getpid();
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435
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
436 /* Switch to blocking mode for playback */
865
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parents: 769
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437 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
765
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438
0
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439 /* We're ready to rock and roll. :-) */
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440 return(0);
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441 }