Mercurial > sdl-ios-xcode
annotate src/audio/alsa/SDL_alsa_audio.c @ 4356:ab2dfac9d5c1 SDL-1.2
There's a bug with gcc 4.4.1 and -O2 where srcp doesn't get the correct value after the first scanline. Ugh.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Oct 2009 23:18:28 +0000 |
| parents | 471dac4b41dd |
| children | a10dac5858fe |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 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 "SDL_name.h" |
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37 #include "SDL_loadso.h" |
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38 #else |
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39 #define SDL_NAME(X) X |
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40 #endif |
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41 |
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42 |
| 0 | 43 /* The tag name used by ALSA audio */ |
| 44 #define DRIVER_NAME "alsa" | |
| 45 | |
| 46 /* Audio driver functions */ | |
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47 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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48 static void ALSA_WaitAudio(_THIS); |
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49 static void ALSA_PlayAudio(_THIS); |
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50 static Uint8 *ALSA_GetAudioBuf(_THIS); |
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51 static void ALSA_CloseAudio(_THIS); |
| 0 | 52 |
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53 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC |
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54 |
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55 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC; |
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56 static void *alsa_handle = NULL; |
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57 static int alsa_loaded = 0; |
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58 |
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59 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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60 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm); |
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61 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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62 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm); |
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63 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm); |
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64 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm); |
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65 static const char *(*SDL_NAME(snd_strerror))(int errnum); |
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66 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void); |
| 1552 | 67 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void); |
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68 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); |
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69 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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70 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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71 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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72 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params, unsigned int *val); |
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73 static 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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74 static int (*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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75 static int (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir); |
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76 static 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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77 static int (*SDL_NAME(snd_pcm_hw_params_get_periods))(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir); |
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78 static int (*SDL_NAME(snd_pcm_hw_params_set_buffer_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val); |
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79 static int (*SDL_NAME(snd_pcm_hw_params_get_buffer_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val); |
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80 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); |
| 1552 | 81 /* |
| 82 */ | |
| 83 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams); | |
| 84 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); | |
| 85 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params); | |
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86 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock); |
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87 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof) |
| 1552 | 88 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof) |
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89 |
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90 /* cast funcs to char* first, to please GCC's strict aliasing rules. */ |
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91 static struct { |
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92 const char *name; |
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93 void **func; |
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94 } alsa_functions[] = { |
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95 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) }, |
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96 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) }, |
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97 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) }, |
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98 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) }, |
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99 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) }, |
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100 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) }, |
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101 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) }, |
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102 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) }, |
| 1552 | 103 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) }, |
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104 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) }, |
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105 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) }, |
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106 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) }, |
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107 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) }, |
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108 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) }, |
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109 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) }, |
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110 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) }, |
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111 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) }, |
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112 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) }, |
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113 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) }, |
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114 { "snd_pcm_hw_params_set_buffer_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_buffer_size_near) }, |
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115 { "snd_pcm_hw_params_get_buffer_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_buffer_size) }, |
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116 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) }, |
| 1552 | 117 { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) }, |
| 118 { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) }, | |
| 119 { "snd_pcm_sw_params", (void**)(char*)&SDL_NAME(snd_pcm_sw_params) }, | |
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120 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) }, |
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121 }; |
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122 |
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123 static void UnloadALSALibrary(void) { |
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124 if (alsa_loaded) { |
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125 SDL_UnloadObject(alsa_handle); |
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126 alsa_handle = NULL; |
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127 alsa_loaded = 0; |
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128 } |
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129 } |
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130 |
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131 static int LoadALSALibrary(void) { |
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132 int i, retval = -1; |
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133 |
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134 alsa_handle = SDL_LoadObject(alsa_library); |
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135 if (alsa_handle) { |
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136 alsa_loaded = 1; |
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137 retval = 0; |
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138 for (i = 0; i < SDL_arraysize(alsa_functions); i++) { |
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139 *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name); |
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140 if (!*alsa_functions[i].func) { |
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141 retval = -1; |
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142 UnloadALSALibrary(); |
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143 break; |
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144 } |
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145 } |
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146 } |
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147 return retval; |
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148 } |
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149 |
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150 #else |
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151 |
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152 static void UnloadALSALibrary(void) { |
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153 return; |
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154 } |
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155 |
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156 static int LoadALSALibrary(void) { |
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157 return 0; |
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158 } |
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159 |
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160 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */ |
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161 |
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162 static const char *get_audio_device(int channels) |
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163 { |
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164 const char *device; |
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165 |
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166 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */ |
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167 if ( device == NULL ) { |
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168 switch (channels) { |
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169 case 6: |
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170 device = "plug:surround51"; |
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171 break; |
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172 case 4: |
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173 device = "plug:surround40"; |
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174 break; |
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175 default: |
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176 device = "default"; |
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177 break; |
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178 } |
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179 } |
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180 return device; |
| 0 | 181 } |
| 182 | |
| 183 /* Audio driver bootstrap functions */ | |
| 184 | |
| 185 static int Audio_Available(void) | |
| 186 { | |
| 187 int available; | |
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188 int status; |
| 0 | 189 snd_pcm_t *handle; |
| 190 | |
| 191 available = 0; | |
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192 if (LoadALSALibrary() < 0) { |
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193 return available; |
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194 } |
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195 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); |
|
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196 if ( status >= 0 ) { |
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197 available = 1; |
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198 SDL_NAME(snd_pcm_close)(handle); |
| 0 | 199 } |
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200 UnloadALSALibrary(); |
| 0 | 201 return(available); |
| 202 } | |
| 203 | |
| 204 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 205 { | |
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206 SDL_free(device->hidden); |
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207 SDL_free(device); |
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208 UnloadALSALibrary(); |
| 0 | 209 } |
| 210 | |
| 211 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 212 { | |
| 213 SDL_AudioDevice *this; | |
| 214 | |
| 215 /* Initialize all variables that we clean on shutdown */ | |
|
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216 LoadALSALibrary(); |
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217 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 218 if ( this ) { |
|
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219 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 220 this->hidden = (struct SDL_PrivateAudioData *) |
|
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221 SDL_malloc((sizeof *this->hidden)); |
| 0 | 222 } |
| 223 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 224 SDL_OutOfMemory(); | |
| 225 if ( this ) { | |
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226 SDL_free(this); |
| 0 | 227 } |
| 228 return(0); | |
| 229 } | |
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230 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 231 |
| 232 /* Set the function pointers */ | |
|
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233 this->OpenAudio = ALSA_OpenAudio; |
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234 this->WaitAudio = ALSA_WaitAudio; |
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235 this->PlayAudio = ALSA_PlayAudio; |
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236 this->GetAudioBuf = ALSA_GetAudioBuf; |
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237 this->CloseAudio = ALSA_CloseAudio; |
| 0 | 238 |
| 239 this->free = Audio_DeleteDevice; | |
| 240 | |
| 241 return this; | |
| 242 } | |
| 243 | |
| 244 AudioBootStrap ALSA_bootstrap = { | |
|
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245 DRIVER_NAME, "ALSA PCM audio", |
| 0 | 246 Audio_Available, Audio_CreateDevice |
| 247 }; | |
| 248 | |
| 249 /* This function waits until it is possible to write a full sound buffer */ | |
|
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250 static void ALSA_WaitAudio(_THIS) |
| 0 | 251 { |
| 252 /* Check to see if the thread-parent process is still alive */ | |
| 253 { static int cnt = 0; | |
| 254 /* Note that this only works with thread implementations | |
| 255 that use a different process id for each thread. | |
| 256 */ | |
| 257 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 258 if ( kill(parent, 0) < 0 ) { | |
| 259 this->enabled = 0; | |
| 260 } | |
| 261 } | |
| 262 } | |
| 263 } | |
| 264 | |
|
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265 |
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266 /* |
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267 * http://bugzilla.libsdl.org/show_bug.cgi?id=110 |
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268 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE |
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269 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR" |
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270 */ |
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271 #define SWIZ6(T) \ |
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272 T *ptr = (T *) mixbuf; \ |
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273 const Uint32 count = (this->spec.samples / 6); \ |
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274 Uint32 i; \ |
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275 for (i = 0; i < count; i++, ptr += 6) { \ |
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276 T tmp; \ |
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277 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \ |
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278 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \ |
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279 } |
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280 |
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281 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); } |
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282 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); } |
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283 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); } |
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284 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); } |
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285 |
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286 #undef SWIZ6 |
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287 |
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288 |
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289 /* |
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290 * Called right before feeding this->mixbuf to the hardware. Swizzle channels |
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291 * from Windows/Mac order to the format alsalib will want. |
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292 */ |
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293 static __inline__ void swizzle_alsa_channels(_THIS) |
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294 { |
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295 if (this->spec.channels == 6) { |
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296 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */ |
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297 if (fmtsize == 16) |
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298 swizzle_alsa_channels_6_16bit(this); |
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299 else if (fmtsize == 8) |
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300 swizzle_alsa_channels_6_8bit(this); |
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301 else if (fmtsize == 32) |
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302 swizzle_alsa_channels_6_32bit(this); |
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303 else if (fmtsize == 64) |
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304 swizzle_alsa_channels_6_64bit(this); |
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305 } |
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306 |
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307 /* !!! FIXME: update this for 7.1 if needed, later. */ |
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308 } |
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309 |
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310 |
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311 static void ALSA_PlayAudio(_THIS) |
| 0 | 312 { |
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313 int status; |
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314 snd_pcm_uframes_t frames_left; |
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315 const Uint8 *sample_buf = (const Uint8 *) mixbuf; |
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316 const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels; |
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317 |
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318 swizzle_alsa_channels(this); |
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319 |
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320 frames_left = ((snd_pcm_uframes_t) this->spec.samples); |
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321 |
| 4337 | 322 while ( frames_left > 0 && this->enabled ) { |
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323 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left); |
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324 if ( status < 0 ) { |
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325 if ( status == -EAGAIN ) { |
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326 SDL_Delay(1); |
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327 continue; |
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328 } |
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329 if ( status == -ESTRPIPE ) { |
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330 do { |
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331 SDL_Delay(1); |
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332 status = SDL_NAME(snd_pcm_resume)(pcm_handle); |
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333 } while ( status == -EAGAIN ); |
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334 } |
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335 if ( status < 0 ) { |
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336 status = SDL_NAME(snd_pcm_prepare)(pcm_handle); |
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337 } |
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338 if ( status < 0 ) { |
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339 /* Hmm, not much we can do - abort */ |
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340 this->enabled = 0; |
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341 return; |
| 0 | 342 } |
|
356
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343 continue; |
| 0 | 344 } |
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345 sample_buf += status * frame_size; |
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346 frames_left -= status; |
| 0 | 347 } |
| 348 } | |
| 349 | |
|
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350 static Uint8 *ALSA_GetAudioBuf(_THIS) |
| 0 | 351 { |
|
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352 return(mixbuf); |
| 0 | 353 } |
| 354 | |
|
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355 static void ALSA_CloseAudio(_THIS) |
| 0 | 356 { |
|
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357 if ( mixbuf != NULL ) { |
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358 SDL_FreeAudioMem(mixbuf); |
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359 mixbuf = NULL; |
| 0 | 360 } |
|
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361 if ( pcm_handle ) { |
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362 SDL_NAME(snd_pcm_drain)(pcm_handle); |
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363 SDL_NAME(snd_pcm_close)(pcm_handle); |
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364 pcm_handle = NULL; |
| 0 | 365 } |
| 366 } | |
| 367 | |
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368 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 0 | 369 { |
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370 int status; |
| 1552 | 371 snd_pcm_hw_params_t *hwparams; |
| 372 snd_pcm_sw_params_t *swparams; | |
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373 snd_pcm_format_t format; |
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374 snd_pcm_uframes_t frames; |
|
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375 unsigned int rate; |
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376 unsigned int periods; |
|
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377 unsigned int channels; |
|
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378 Uint16 test_format; |
| 0 | 379 |
| 380 /* Open the audio device */ | |
|
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381 /* Name of device should depend on # channels in spec */ |
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382 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); |
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383 |
|
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384 if ( status < 0 ) { |
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385 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status)); |
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386 return(-1); |
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387 } |
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388 |
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389 /* Figure out what the hardware is capable of */ |
| 1552 | 390 snd_pcm_hw_params_alloca(&hwparams); |
| 391 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams); | |
|
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392 if ( status < 0 ) { |
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393 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status)); |
|
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394 ALSA_CloseAudio(this); |
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395 return(-1); |
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396 } |
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397 |
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398 /* SDL only uses interleaved sample output */ |
| 1552 | 399 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED); |
|
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400 if ( status < 0 ) { |
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401 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status)); |
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402 ALSA_CloseAudio(this); |
| 0 | 403 return(-1); |
| 404 } | |
| 405 | |
| 406 /* Try for a closest match on audio format */ | |
|
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407 status = -1; |
| 0 | 408 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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409 test_format && (status < 0); ) { |
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410 switch ( test_format ) { |
| 0 | 411 case AUDIO_U8: |
|
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412 format = SND_PCM_FORMAT_U8; |
| 0 | 413 break; |
| 414 case AUDIO_S8: | |
|
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415 format = SND_PCM_FORMAT_S8; |
| 0 | 416 break; |
| 417 case AUDIO_S16LSB: | |
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418 format = SND_PCM_FORMAT_S16_LE; |
| 0 | 419 break; |
| 420 case AUDIO_S16MSB: | |
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421 format = SND_PCM_FORMAT_S16_BE; |
| 0 | 422 break; |
| 423 case AUDIO_U16LSB: | |
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424 format = SND_PCM_FORMAT_U16_LE; |
| 0 | 425 break; |
| 426 case AUDIO_U16MSB: | |
|
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427 format = SND_PCM_FORMAT_U16_BE; |
| 0 | 428 break; |
| 429 default: | |
|
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430 format = 0; |
| 0 | 431 break; |
| 432 } | |
|
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433 if ( format != 0 ) { |
| 1552 | 434 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format); |
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435 } |
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436 if ( status < 0 ) { |
| 0 | 437 test_format = SDL_NextAudioFormat(); |
| 438 } | |
| 439 } | |
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440 if ( status < 0 ) { |
| 0 | 441 SDL_SetError("Couldn't find any hardware audio formats"); |
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442 ALSA_CloseAudio(this); |
| 0 | 443 return(-1); |
| 444 } | |
| 445 spec->format = test_format; | |
| 446 | |
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447 /* Set the number of channels */ |
| 1552 | 448 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels); |
|
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449 channels = spec->channels; |
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450 if ( status < 0 ) { |
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451 status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams, &channels); |
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452 if ( status < 0 ) { |
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453 SDL_SetError("Couldn't set audio channels"); |
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454 ALSA_CloseAudio(this); |
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455 return(-1); |
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456 } |
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457 spec->channels = channels; |
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458 } |
| 0 | 459 |
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460 /* Set the audio rate */ |
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461 rate = spec->freq; |
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462 |
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463 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, &rate, NULL); |
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464 if ( status < 0 ) { |
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465 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status)); |
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466 ALSA_CloseAudio(this); |
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467 return(-1); |
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468 } |
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469 spec->freq = rate; |
| 0 | 470 |
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471 /* Set the buffer size, in samples */ |
| 4347 | 472 if (getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE")) { |
| 473 frames = spec->samples; | |
| 474 status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL); | |
| 475 if ( status < 0 ) { | |
| 476 SDL_SetError("Couldn't set period size: %s", SDL_NAME(snd_strerror)(status)); | |
| 477 ALSA_CloseAudio(this); | |
| 478 return(-1); | |
| 479 } | |
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480 |
| 4347 | 481 spec->samples = frames; |
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482 |
| 4347 | 483 periods = 2; |
| 484 status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL); | |
| 485 if ( status < 0 ) { | |
| 486 SDL_SetError("Couldn't set period count: %s", SDL_NAME(snd_strerror)(status)); | |
| 487 ALSA_CloseAudio(this); | |
| 488 return(-1); | |
| 489 } | |
| 490 } else { | |
| 491 frames = spec->samples * 2; | |
| 492 status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames); | |
| 493 if ( status < 0 ) { | |
| 494 SDL_SetError("Couldn't set buffer size: %s", SDL_NAME(snd_strerror)(status)); | |
| 495 ALSA_CloseAudio(this); | |
| 496 return(-1); | |
| 497 } | |
|
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498 } |
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499 |
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500 /* "set" the hardware with the desired parameters */ |
| 1552 | 501 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams); |
| 502 if ( status < 0 ) { | |
| 503 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status)); | |
| 504 ALSA_CloseAudio(this); | |
| 505 return(-1); | |
| 506 } | |
| 507 | |
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508 /* This is useful for debugging */ |
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509 if (getenv("SDL_AUDIO_ALSA_DEBUG_PERIOD_SIZE")) { |
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510 snd_pcm_uframes_t bufsize; |
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511 snd_pcm_sframes_t persize; |
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512 unsigned int periods; int dir; |
| 1552 | 513 |
|
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514 SDL_NAME(snd_pcm_hw_params_get_buffer_size)(hwparams, &bufsize); |
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515 SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams, &persize, &dir); |
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516 SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams, &periods, &dir); |
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517 |
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518 fprintf(stderr, "ALSA: period size = %ld, periods = %u, buffer size = %lu\n", persize, periods, bufsize); |
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519 } |
| 1552 | 520 |
| 521 /* Set the software parameters */ | |
| 522 snd_pcm_sw_params_alloca(&swparams); | |
| 523 status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams); | |
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524 if ( status < 0 ) { |
| 1552 | 525 SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status)); |
| 526 ALSA_CloseAudio(this); | |
| 527 return(-1); | |
| 528 } | |
|
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529 status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 1); |
| 1552 | 530 if ( status < 0 ) { |
| 531 SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status)); | |
| 532 ALSA_CloseAudio(this); | |
| 533 return(-1); | |
| 534 } | |
| 535 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams); | |
| 536 if ( status < 0 ) { | |
| 537 SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status)); | |
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538 ALSA_CloseAudio(this); |
| 0 | 539 return(-1); |
| 540 } | |
| 541 | |
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542 /* Calculate the final parameters for this audio specification */ |
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543 SDL_CalculateAudioSpec(spec); |
| 0 | 544 |
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545 /* Allocate mixing buffer */ |
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546 mixlen = spec->size; |
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547 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); |
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548 if ( mixbuf == NULL ) { |
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549 ALSA_CloseAudio(this); |
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550 return(-1); |
| 0 | 551 } |
|
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552 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 553 |
| 554 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 555 parent = getpid(); | |
| 556 | |
|
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Editors Note: The original patch was modified to use SDL_Delay() instead of
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|
557 /* Switch to blocking mode for playback */ |
|
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|
558 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0); |
|
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559 |
| 0 | 560 /* We're ready to rock and roll. :-) */ |
| 561 return(0); | |
| 562 } |