Mercurial > sdl-ios-xcode
annotate src/audio/alsa/SDL_alsa_audio.c @ 1552:b2462b772cce
Fixed bug #79
Implemented snd_pcm_sw_params_set_start_threshold() and snd_pcm_sw_params_set_avail_min() in the ALSA 0.9 driver.
This doesn't actually change any latency for me, but it's the right thing to do...
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 10:41:49 +0000 |
parents | d910939febfa |
children | 63fa37538842 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Allow access to a raw mixing buffer */ | |
25 | |
26 #include <sys/types.h> | |
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27 #include <signal.h> /* For kill() */ |
0 | 28 |
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29 #include "SDL_timer.h" |
0 | 30 #include "SDL_audio.h" |
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31 #include "../SDL_audiomem.h" |
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32 #include "../SDL_audio_c.h" |
0 | 33 #include "SDL_alsa_audio.h" |
34 | |
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35 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC |
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36 #include <dlfcn.h> |
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37 #include "SDL_name.h" |
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38 #include "SDL_loadso.h" |
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39 #else |
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40 #define SDL_NAME(X) X |
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41 #endif |
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42 |
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43 |
0 | 44 /* The tag name used by ALSA audio */ |
45 #define DRIVER_NAME "alsa" | |
46 | |
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47 /* The default ALSA audio driver */ |
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48 #define DEFAULT_DEVICE "default" |
0 | 49 |
50 /* Audio driver functions */ | |
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51 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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52 static void ALSA_WaitAudio(_THIS); |
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53 static void ALSA_PlayAudio(_THIS); |
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54 static Uint8 *ALSA_GetAudioBuf(_THIS); |
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55 static void ALSA_CloseAudio(_THIS); |
0 | 56 |
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57 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC |
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58 |
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59 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC; |
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60 static void *alsa_handle = NULL; |
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61 static int alsa_loaded = 0; |
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62 |
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63 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode); |
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64 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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65 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm); |
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66 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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67 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm); |
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68 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm); |
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69 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm); |
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70 static const char *(*SDL_NAME(snd_strerror))(int errnum); |
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71 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void); |
1552 | 72 static size_t (*SDL_NAME(snd_pcm_sw_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); |
1552 | 83 /* |
84 static unsigned int (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params); | |
85 static int (*SDL_NAME(snd_pcm_hw_params_get_periods))(snd_pcm_hw_params_t *params); | |
86 */ | |
87 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams); | |
88 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val); | |
89 static int (*SDL_NAME(snd_pcm_sw_params_set_avail_min))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val); | |
90 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params); | |
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91 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof) |
1552 | 92 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof) |
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93 |
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94 /* cast funcs to char* first, to please GCC's strict aliasing rules. */ |
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95 static struct { |
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96 const char *name; |
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97 void **func; |
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98 } alsa_functions[] = { |
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99 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) }, |
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100 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) }, |
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101 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) }, |
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102 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) }, |
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103 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) }, |
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104 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) }, |
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105 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) }, |
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106 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) }, |
1552 | 107 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) }, |
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108 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) }, |
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109 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) }, |
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110 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) }, |
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111 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) }, |
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112 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) }, |
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113 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) }, |
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114 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) }, |
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115 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) }, |
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116 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) }, |
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117 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) }, |
1552 | 118 /* |
119 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) }, | |
120 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) }, | |
121 */ | |
122 { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) }, | |
123 { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) }, | |
124 { "snd_pcm_sw_params_set_avail_min", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_avail_min) }, | |
125 { "snd_pcm_sw_params", (void**)(char*)&SDL_NAME(snd_pcm_sw_params) }, | |
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126 }; |
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127 |
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128 static void UnloadALSALibrary(void) { |
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129 if (alsa_loaded) { |
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130 /* SDL_UnloadObject(alsa_handle);*/ |
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131 dlclose(alsa_handle); |
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132 alsa_handle = NULL; |
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133 alsa_loaded = 0; |
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134 } |
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135 } |
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136 |
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137 static int LoadALSALibrary(void) { |
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138 int i, retval = -1; |
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139 |
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140 /* alsa_handle = SDL_LoadObject(alsa_library);*/ |
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141 alsa_handle = dlopen(alsa_library,RTLD_NOW); |
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142 if (alsa_handle) { |
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143 alsa_loaded = 1; |
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144 retval = 0; |
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145 for (i = 0; i < SDL_arraysize(alsa_functions); i++) { |
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146 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/ |
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147 #if HAVE_DLVSYM |
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148 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9"); |
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149 if (!*alsa_functions[i].func) |
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150 #endif |
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151 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name); |
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152 if (!*alsa_functions[i].func) { |
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153 retval = -1; |
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154 UnloadALSALibrary(); |
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155 break; |
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156 } |
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157 } |
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158 } |
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159 return retval; |
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160 } |
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161 |
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162 #else |
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163 |
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164 static void UnloadALSALibrary(void) { |
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165 return; |
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166 } |
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167 |
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168 static int LoadALSALibrary(void) { |
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169 return 0; |
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170 } |
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171 |
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172 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */ |
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173 |
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174 static const char *get_audio_device(int channels) |
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175 { |
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176 const char *device; |
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177 |
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178 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */ |
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179 if ( device == NULL ) { |
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180 if (channels == 6) device = "surround51"; |
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181 else if (channels == 4) device = "surround40"; |
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182 else device = DEFAULT_DEVICE; |
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183 } |
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184 return device; |
0 | 185 } |
186 | |
187 /* Audio driver bootstrap functions */ | |
188 | |
189 static int Audio_Available(void) | |
190 { | |
191 int available; | |
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192 int status; |
0 | 193 snd_pcm_t *handle; |
194 | |
195 available = 0; | |
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196 if (LoadALSALibrary() < 0) { |
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197 return available; |
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198 } |
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199 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); |
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200 if ( status >= 0 ) { |
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201 available = 1; |
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202 SDL_NAME(snd_pcm_close)(handle); |
0 | 203 } |
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204 UnloadALSALibrary(); |
0 | 205 return(available); |
206 } | |
207 | |
208 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
209 { | |
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210 SDL_free(device->hidden); |
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211 SDL_free(device); |
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212 UnloadALSALibrary(); |
0 | 213 } |
214 | |
215 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
216 { | |
217 SDL_AudioDevice *this; | |
218 | |
219 /* Initialize all variables that we clean on shutdown */ | |
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220 LoadALSALibrary(); |
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221 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
0 | 222 if ( this ) { |
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223 SDL_memset(this, 0, (sizeof *this)); |
0 | 224 this->hidden = (struct SDL_PrivateAudioData *) |
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225 SDL_malloc((sizeof *this->hidden)); |
0 | 226 } |
227 if ( (this == NULL) || (this->hidden == NULL) ) { | |
228 SDL_OutOfMemory(); | |
229 if ( this ) { | |
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230 SDL_free(this); |
0 | 231 } |
232 return(0); | |
233 } | |
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234 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
0 | 235 |
236 /* Set the function pointers */ | |
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237 this->OpenAudio = ALSA_OpenAudio; |
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238 this->WaitAudio = ALSA_WaitAudio; |
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239 this->PlayAudio = ALSA_PlayAudio; |
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240 this->GetAudioBuf = ALSA_GetAudioBuf; |
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241 this->CloseAudio = ALSA_CloseAudio; |
0 | 242 |
243 this->free = Audio_DeleteDevice; | |
244 | |
245 return this; | |
246 } | |
247 | |
248 AudioBootStrap ALSA_bootstrap = { | |
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249 DRIVER_NAME, "ALSA 0.9 PCM audio", |
0 | 250 Audio_Available, Audio_CreateDevice |
251 }; | |
252 | |
253 /* This function waits until it is possible to write a full sound buffer */ | |
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254 static void ALSA_WaitAudio(_THIS) |
0 | 255 { |
256 /* Check to see if the thread-parent process is still alive */ | |
257 { static int cnt = 0; | |
258 /* Note that this only works with thread implementations | |
259 that use a different process id for each thread. | |
260 */ | |
261 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
262 if ( kill(parent, 0) < 0 ) { | |
263 this->enabled = 0; | |
264 } | |
265 } | |
266 } | |
267 } | |
268 | |
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269 static void ALSA_PlayAudio(_THIS) |
0 | 270 { |
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271 int status; |
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272 int sample_len; |
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273 signed short *sample_buf; |
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274 |
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275 sample_len = this->spec.samples; |
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276 sample_buf = (signed short *)mixbuf; |
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277 while ( sample_len > 0 ) { |
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278 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len); |
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279 if ( status < 0 ) { |
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280 if ( status == -EAGAIN ) { |
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281 SDL_Delay(1); |
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282 continue; |
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283 } |
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284 if ( status == -ESTRPIPE ) { |
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285 do { |
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286 SDL_Delay(1); |
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287 status = SDL_NAME(snd_pcm_resume)(pcm_handle); |
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288 } while ( status == -EAGAIN ); |
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289 } |
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290 if ( status < 0 ) { |
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291 status = SDL_NAME(snd_pcm_prepare)(pcm_handle); |
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292 } |
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293 if ( status < 0 ) { |
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294 /* Hmm, not much we can do - abort */ |
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295 this->enabled = 0; |
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296 return; |
0 | 297 } |
356
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298 continue; |
0 | 299 } |
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300 sample_buf += status * this->spec.channels; |
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301 sample_len -= status; |
0 | 302 } |
303 } | |
304 | |
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305 static Uint8 *ALSA_GetAudioBuf(_THIS) |
0 | 306 { |
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307 return(mixbuf); |
0 | 308 } |
309 | |
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310 static void ALSA_CloseAudio(_THIS) |
0 | 311 { |
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312 if ( mixbuf != NULL ) { |
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313 SDL_FreeAudioMem(mixbuf); |
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314 mixbuf = NULL; |
0 | 315 } |
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316 if ( pcm_handle ) { |
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317 SDL_NAME(snd_pcm_drain)(pcm_handle); |
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318 SDL_NAME(snd_pcm_close)(pcm_handle); |
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319 pcm_handle = NULL; |
0 | 320 } |
321 } | |
322 | |
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323 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec) |
0 | 324 { |
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325 int status; |
1552 | 326 snd_pcm_hw_params_t *hwparams; |
327 snd_pcm_sw_params_t *swparams; | |
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328 snd_pcm_format_t format; |
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329 snd_pcm_uframes_t frames; |
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330 Uint16 test_format; |
0 | 331 |
332 /* Open the audio device */ | |
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333 /* Name of device should depend on # channels in spec */ |
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334 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); |
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335 |
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336 if ( status < 0 ) { |
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337 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status)); |
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338 return(-1); |
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339 } |
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340 |
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341 /* Figure out what the hardware is capable of */ |
1552 | 342 snd_pcm_hw_params_alloca(&hwparams); |
343 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams); | |
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344 if ( status < 0 ) { |
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345 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status)); |
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346 ALSA_CloseAudio(this); |
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347 return(-1); |
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348 } |
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349 |
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350 /* SDL only uses interleaved sample output */ |
1552 | 351 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED); |
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352 if ( status < 0 ) { |
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353 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status)); |
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354 ALSA_CloseAudio(this); |
0 | 355 return(-1); |
356 } | |
357 | |
358 /* Try for a closest match on audio format */ | |
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359 status = -1; |
0 | 360 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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361 test_format && (status < 0); ) { |
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362 switch ( test_format ) { |
0 | 363 case AUDIO_U8: |
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364 format = SND_PCM_FORMAT_U8; |
0 | 365 break; |
366 case AUDIO_S8: | |
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367 format = SND_PCM_FORMAT_S8; |
0 | 368 break; |
369 case AUDIO_S16LSB: | |
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370 format = SND_PCM_FORMAT_S16_LE; |
0 | 371 break; |
372 case AUDIO_S16MSB: | |
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373 format = SND_PCM_FORMAT_S16_BE; |
0 | 374 break; |
375 case AUDIO_U16LSB: | |
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376 format = SND_PCM_FORMAT_U16_LE; |
0 | 377 break; |
378 case AUDIO_U16MSB: | |
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379 format = SND_PCM_FORMAT_U16_BE; |
0 | 380 break; |
381 default: | |
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382 format = 0; |
0 | 383 break; |
384 } | |
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385 if ( format != 0 ) { |
1552 | 386 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format); |
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387 } |
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388 if ( status < 0 ) { |
0 | 389 test_format = SDL_NextAudioFormat(); |
390 } | |
391 } | |
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392 if ( status < 0 ) { |
0 | 393 SDL_SetError("Couldn't find any hardware audio formats"); |
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394 ALSA_CloseAudio(this); |
0 | 395 return(-1); |
396 } | |
397 spec->format = test_format; | |
398 | |
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399 /* Set the number of channels */ |
1552 | 400 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels); |
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401 if ( status < 0 ) { |
1552 | 402 status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams); |
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403 if ( (status <= 0) || (status > 2) ) { |
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404 SDL_SetError("Couldn't set audio channels"); |
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405 ALSA_CloseAudio(this); |
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406 return(-1); |
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407 } |
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408 spec->channels = status; |
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409 } |
0 | 410 |
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411 /* Set the audio rate */ |
1552 | 412 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, spec->freq, NULL); |
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413 if ( status < 0 ) { |
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414 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status)); |
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415 ALSA_CloseAudio(this); |
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416 return(-1); |
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417 } |
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418 spec->freq = status; |
0 | 419 |
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420 /* Set the buffer size, in samples */ |
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421 frames = spec->samples; |
1552 | 422 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, frames, NULL); |
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423 spec->samples = frames; |
1552 | 424 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, 2, NULL); |
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425 |
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426 /* "set" the hardware with the desired parameters */ |
1552 | 427 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams); |
428 if ( status < 0 ) { | |
429 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status)); | |
430 ALSA_CloseAudio(this); | |
431 return(-1); | |
432 } | |
433 | |
434 /* | |
435 { unsigned int bufsize; int fragments; | |
436 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams); | |
437 fragments = SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams); | |
438 | |
439 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments); | |
440 } | |
441 */ | |
442 | |
443 /* Set the software parameters */ | |
444 snd_pcm_sw_params_alloca(&swparams); | |
445 status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams); | |
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446 if ( status < 0 ) { |
1552 | 447 SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status)); |
448 ALSA_CloseAudio(this); | |
449 return(-1); | |
450 } | |
451 status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 0); | |
452 if ( status < 0 ) { | |
453 SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status)); | |
454 ALSA_CloseAudio(this); | |
455 return(-1); | |
456 } | |
457 status = SDL_NAME(snd_pcm_sw_params_set_avail_min)(pcm_handle, swparams, frames); | |
458 if ( status < 0 ) { | |
459 SDL_SetError("Couldn't set avail min: %s", SDL_NAME(snd_strerror)(status)); | |
460 ALSA_CloseAudio(this); | |
461 return(-1); | |
462 } | |
463 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams); | |
464 if ( status < 0 ) { | |
465 SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status)); | |
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466 ALSA_CloseAudio(this); |
0 | 467 return(-1); |
468 } | |
469 | |
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470 /* Calculate the final parameters for this audio specification */ |
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471 SDL_CalculateAudioSpec(spec); |
0 | 472 |
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473 /* Allocate mixing buffer */ |
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474 mixlen = spec->size; |
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475 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); |
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476 if ( mixbuf == NULL ) { |
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477 ALSA_CloseAudio(this); |
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478 return(-1); |
0 | 479 } |
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480 SDL_memset(mixbuf, spec->silence, spec->size); |
0 | 481 |
482 /* Get the parent process id (we're the parent of the audio thread) */ | |
483 parent = getpid(); | |
484 | |
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485 /* Switch to blocking mode for playback */ |
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486 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0); |
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487 |
0 | 488 /* We're ready to rock and roll. :-) */ |
489 return(0); | |
490 } |