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annotate src/audio/alsa/SDL_alsa_audio.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents cd3db072ba8a
children a7ad7081b977
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 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include <sys/types.h>
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27 #include <signal.h> /* For kill() */
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audiomem.h"
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32 #include "../SDL_audio_c.h"
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33 #include "SDL_alsa_audio.h"
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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
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44 /* The tag name used by ALSA audio */
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45 #define DRIVER_NAME "alsa"
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46
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47 /* The default ALSA audio driver */
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48 #define DEFAULT_DEVICE "default"
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49
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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);
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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,
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64 snd_pcm_stream_t stream, int mode);
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65 static int (*SDL_NAME(snd_pcm_open)) (snd_pcm_t ** pcm, const char *name,
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66 snd_pcm_stream_t stream, int mode);
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67 static int (*SDL_NAME(snd_pcm_close)) (snd_pcm_t * pcm);
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68 static snd_pcm_sframes_t(*SDL_NAME(snd_pcm_writei)) (snd_pcm_t * pcm,
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69 const void *buffer,
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70 snd_pcm_uframes_t size);
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71 static int (*SDL_NAME(snd_pcm_resume)) (snd_pcm_t * pcm);
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72 static int (*SDL_NAME(snd_pcm_prepare)) (snd_pcm_t * pcm);
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73 static int (*SDL_NAME(snd_pcm_drain)) (snd_pcm_t * pcm);
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74 static const char *(*SDL_NAME(snd_strerror)) (int errnum);
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75 static size_t(*SDL_NAME(snd_pcm_hw_params_sizeof)) (void);
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76 static size_t(*SDL_NAME(snd_pcm_sw_params_sizeof)) (void);
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77 static int (*SDL_NAME(snd_pcm_hw_params_any)) (snd_pcm_t * pcm,
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78 snd_pcm_hw_params_t * params);
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79 static int (*SDL_NAME(snd_pcm_hw_params_set_access)) (snd_pcm_t * pcm,
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80 snd_pcm_hw_params_t *
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81 params,
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82 snd_pcm_access_t
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83 access);
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84 static int (*SDL_NAME(snd_pcm_hw_params_set_format)) (snd_pcm_t * pcm,
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85 snd_pcm_hw_params_t *
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86 params,
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87 snd_pcm_format_t val);
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88 static int (*SDL_NAME(snd_pcm_hw_params_set_channels)) (snd_pcm_t * pcm,
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89 snd_pcm_hw_params_t *
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90 params,
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91 unsigned int val);
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92 static int (*SDL_NAME(snd_pcm_hw_params_get_channels)) (const
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93 snd_pcm_hw_params_t *
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94 params);
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95 static unsigned int
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96 (*SDL_NAME(snd_pcm_hw_params_set_rate_near)) (snd_pcm_t *
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97 pcm,
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98 snd_pcm_hw_params_t
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99 * params,
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100 unsigned int val, int *dir);
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101 static snd_pcm_uframes_t
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102 (*SDL_NAME(snd_pcm_hw_params_set_period_size_near)) (snd_pcm_t * pcm,
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103 snd_pcm_hw_params_t
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104 * params,
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105 snd_pcm_uframes_t
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106 val, int *dir);
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107 static snd_pcm_sframes_t
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108 (*SDL_NAME(snd_pcm_hw_params_get_period_size)) (const
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109 snd_pcm_hw_params_t
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110 * params);
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111 static unsigned int
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112 (*SDL_NAME(snd_pcm_hw_params_set_periods_near)) (snd_pcm_t * pcm,
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113 snd_pcm_hw_params_t
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114 * params,
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115 unsigned int val,
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116 int *dir);
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117 static int (*SDL_NAME(snd_pcm_hw_params_get_periods)) (snd_pcm_hw_params_t *
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118 params);
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119 static int (*SDL_NAME(snd_pcm_hw_params)) (snd_pcm_t * pcm,
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120 snd_pcm_hw_params_t * params);
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121 /*
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122 */
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123 static int (*SDL_NAME(snd_pcm_sw_params_current)) (snd_pcm_t * pcm,
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124 snd_pcm_sw_params_t *
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125 swparams);
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126 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold)) (snd_pcm_t *
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127 pcm,
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128 snd_pcm_sw_params_t
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129 * params,
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130 snd_pcm_uframes_t
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131 val);
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132 static int (*SDL_NAME(snd_pcm_sw_params_set_avail_min)) (snd_pcm_t * pcm,
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133 snd_pcm_sw_params_t
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134 * params,
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135 snd_pcm_uframes_t
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136 val);
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137 static int (*SDL_NAME(snd_pcm_sw_params)) (snd_pcm_t * pcm,
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138 snd_pcm_sw_params_t * params);
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139 static int (*SDL_NAME(snd_pcm_nonblock)) (snd_pcm_t * pcm, int nonblock);
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140 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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141 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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142
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143 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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144 static struct
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145 {
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146 const char *name;
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147 void **func;
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148 } alsa_functions[] = {
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149 {
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150 "snd_pcm_open", (void **) (char *) &SDL_NAME(snd_pcm_open)}, {
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151 "snd_pcm_close", (void **) (char *) &SDL_NAME(snd_pcm_close)}, {
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152 "snd_pcm_writei", (void **) (char *) &SDL_NAME(snd_pcm_writei)}, {
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153 "snd_pcm_resume", (void **) (char *) &SDL_NAME(snd_pcm_resume)}, {
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154 "snd_pcm_prepare", (void **) (char *) &SDL_NAME(snd_pcm_prepare)}, {
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155 "snd_pcm_drain", (void **) (char *) &SDL_NAME(snd_pcm_drain)}, {
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156 "snd_strerror", (void **) (char *) &SDL_NAME(snd_strerror)}, {
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157 "snd_pcm_hw_params_sizeof",
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158 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_sizeof)}, {
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159 "snd_pcm_sw_params_sizeof",
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160 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_sizeof)}, {
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161 "snd_pcm_hw_params_any",
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162 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_any)}, {
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163 "snd_pcm_hw_params_set_access",
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164 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_access)}, {
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165 "snd_pcm_hw_params_set_format",
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166 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_format)}, {
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167 "snd_pcm_hw_params_set_channels",
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168 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_channels)}, {
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169 "snd_pcm_hw_params_get_channels",
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170 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_channels)}, {
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171 "snd_pcm_hw_params_set_rate_near",
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172 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_rate_near)}, {
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173 "snd_pcm_hw_params_set_period_size_near", (void **) (char *)
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174 &SDL_NAME(snd_pcm_hw_params_set_period_size_near)}, {
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175 "snd_pcm_hw_params_get_period_size",
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176 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_period_size)},
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177 {
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178 "snd_pcm_hw_params_set_periods_near", (void **) (char *)
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179 &SDL_NAME(snd_pcm_hw_params_set_periods_near)}, {
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180 "snd_pcm_hw_params_get_periods",
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181 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_periods)}, {
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182 "snd_pcm_hw_params", (void **) (char *) &SDL_NAME(snd_pcm_hw_params)}, {
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183 "snd_pcm_sw_params_current",
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184 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_current)}, {
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185 "snd_pcm_sw_params_set_start_threshold", (void **) (char *)
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186 &SDL_NAME(snd_pcm_sw_params_set_start_threshold)}, {
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187 "snd_pcm_sw_params_set_avail_min",
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188 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_set_avail_min)}, {
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189 "snd_pcm_sw_params", (void **) (char *) &SDL_NAME(snd_pcm_sw_params)}, {
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190 "snd_pcm_nonblock", (void **) (char *) &SDL_NAME(snd_pcm_nonblock)},};
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191
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192 static void
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193 UnloadALSALibrary(void)
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194 {
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195 if (alsa_loaded) {
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196 /* SDL_UnloadObject(alsa_handle);*/
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197 dlclose(alsa_handle);
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198 alsa_handle = NULL;
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199 alsa_loaded = 0;
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200 }
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201 }
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202
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203 static int
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204 LoadALSALibrary(void)
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205 {
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206 int i, retval = -1;
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207
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208 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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209 alsa_handle = dlopen(alsa_library, RTLD_NOW);
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210 if (alsa_handle) {
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211 alsa_loaded = 1;
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212 retval = 0;
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213 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
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214 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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215 #if HAVE_DLVSYM
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216 *alsa_functions[i].func =
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217 dlvsym(alsa_handle, alsa_functions[i].name, "ALSA_0.9");
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218 if (!*alsa_functions[i].func)
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219 #endif
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220 *alsa_functions[i].func =
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221 dlsym(alsa_handle, alsa_functions[i].name);
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222 if (!*alsa_functions[i].func) {
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223 retval = -1;
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224 UnloadALSALibrary();
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225 break;
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226 }
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227 }
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228 }
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229 return retval;
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230 }
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231
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232 #else
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233
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234 static void
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235 UnloadALSALibrary(void)
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236 {
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237 return;
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238 }
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239
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240 static int
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241 LoadALSALibrary(void)
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242 {
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243 return 0;
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244 }
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245
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246 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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247
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248 static const char *
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249 get_audio_device(int channels)
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250 {
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251 const char *device;
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252
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253 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
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254 if (device == NULL) {
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255 if (channels == 6)
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256 device = "surround51";
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257 else if (channels == 4)
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258 device = "surround40";
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259 else
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260 device = DEFAULT_DEVICE;
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261 }
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262 return device;
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263 }
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264
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265 /* Audio driver bootstrap functions */
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266
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267 static int
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268 Audio_Available(void)
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269 {
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270 int available;
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271 int status;
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272 snd_pcm_t *handle;
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273
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274 available = 0;
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275 if (LoadALSALibrary() < 0) {
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276 return available;
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277 }
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278 status =
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279 SDL_NAME(snd_pcm_open) (&handle, get_audio_device(2),
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280 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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281 if (status >= 0) {
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282 available = 1;
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283 SDL_NAME(snd_pcm_close) (handle);
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284 }
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285 UnloadALSALibrary();
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286 return (available);
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287 }
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288
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289 static void
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290 Audio_DeleteDevice(SDL_AudioDevice * device)
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291 {
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292 SDL_free(device->hidden);
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293 SDL_free(device);
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294 UnloadALSALibrary();
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295 }
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296
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297 static SDL_AudioDevice *
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298 Audio_CreateDevice(int devindex)
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299 {
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300 SDL_AudioDevice *this;
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301
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302 /* Initialize all variables that we clean on shutdown */
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303 LoadALSALibrary();
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304 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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305 if (this) {
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306 SDL_memset(this, 0, (sizeof *this));
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307 this->hidden = (struct SDL_PrivateAudioData *)
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308 SDL_malloc((sizeof *this->hidden));
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309 }
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310 if ((this == NULL) || (this->hidden == NULL)) {
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311 SDL_OutOfMemory();
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312 if (this) {
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313 SDL_free(this);
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314 }
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315 return (0);
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316 }
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317 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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318
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319 /* Set the function pointers */
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320 this->OpenAudio = ALSA_OpenAudio;
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321 this->WaitAudio = ALSA_WaitAudio;
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322 this->PlayAudio = ALSA_PlayAudio;
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323 this->GetAudioBuf = ALSA_GetAudioBuf;
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324 this->CloseAudio = ALSA_CloseAudio;
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325
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326 this->free = Audio_DeleteDevice;
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327
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328 return this;
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329 }
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330
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331 AudioBootStrap ALSA_bootstrap = {
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332 DRIVER_NAME, "ALSA 0.9 PCM audio",
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333 Audio_Available, Audio_CreateDevice
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334 };
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335
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336 /* This function waits until it is possible to write a full sound buffer */
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337 static void
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338 ALSA_WaitAudio(_THIS)
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339 {
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340 /* Check to see if the thread-parent process is still alive */
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341 {
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342 static int cnt = 0;
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343 /* Note that this only works with thread implementations
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344 that use a different process id for each thread.
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345 */
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346 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
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347 if (kill(parent, 0) < 0) {
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348 this->enabled = 0;
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349 }
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350 }
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351 }
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352 }
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353
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354 static void
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355 ALSA_PlayAudio(_THIS)
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356 {
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357 int status;
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358 int sample_len;
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359 signed short *sample_buf;
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360
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361 sample_len = this->spec.samples;
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362 sample_buf = (signed short *) mixbuf;
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363 while (sample_len > 0) {
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364 status =
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365 SDL_NAME(snd_pcm_writei) (pcm_handle, sample_buf, sample_len);
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366 if (status < 0) {
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367 if (status == -EAGAIN) {
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368 SDL_Delay(1);
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369 continue;
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370 }
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371 if (status == -ESTRPIPE) {
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372 do {
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373 SDL_Delay(1);
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374 status = SDL_NAME(snd_pcm_resume) (pcm_handle);
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375 }
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376 while (status == -EAGAIN);
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377 }
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378 if (status < 0) {
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379 status = SDL_NAME(snd_pcm_prepare) (pcm_handle);
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380 }
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381 if (status < 0) {
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382 /* Hmm, not much we can do - abort */
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383 this->enabled = 0;
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384 return;
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385 }
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386 continue;
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387 }
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388 sample_buf += status * this->spec.channels;
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389 sample_len -= status;
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parents: 1553
diff changeset
390 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
393 static Uint8 *
1668
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parents: 1664
diff changeset
394 ALSA_GetAudioBuf(_THIS)
0
74212992fb08 Initial revision
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parents:
diff changeset
395 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
396 return (mixbuf);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
399 static void
1668
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diff changeset
400 ALSA_CloseAudio(_THIS)
0
74212992fb08 Initial revision
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parents:
diff changeset
401 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
402 if (mixbuf != NULL) {
1668
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diff changeset
403 SDL_FreeAudioMem(mixbuf);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
404 mixbuf = NULL;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
405 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
406 if (pcm_handle) {
1668
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parents: 1664
diff changeset
407 SDL_NAME(snd_pcm_drain) (pcm_handle);
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parents: 1664
diff changeset
408 SDL_NAME(snd_pcm_close) (pcm_handle);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
409 pcm_handle = NULL;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
410 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412
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parents: 1553
diff changeset
413 static int
1668
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diff changeset
414 ALSA_OpenAudio(_THIS, SDL_AudioSpec * spec)
0
74212992fb08 Initial revision
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parents:
diff changeset
415 {
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diff changeset
416 int status;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
417 snd_pcm_hw_params_t *hwparams;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
418 snd_pcm_sw_params_t *swparams;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
419 snd_pcm_format_t format;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
420 snd_pcm_uframes_t frames;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
421 Uint16 test_format;
0
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parents:
diff changeset
422
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
423 /* Open the audio device */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
424 /* Name of device should depend on # channels in spec */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
425 status =
1668
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parents: 1664
diff changeset
426 SDL_NAME(snd_pcm_open) (&pcm_handle,
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
427 get_audio_device(spec->channels),
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
428 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
429
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
430 if (status < 0) {
1668
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parents: 1664
diff changeset
431 SDL_SetError("Couldn't open audio device: %s",
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
432 SDL_NAME(snd_strerror) (status));
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
433 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
434 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
435
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
436 /* Figure out what the hardware is capable of */
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diff changeset
437 snd_pcm_hw_params_alloca(&hwparams);
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diff changeset
438 status = SDL_NAME(snd_pcm_hw_params_any) (pcm_handle, hwparams);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
439 if (status < 0) {
1668
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diff changeset
440 SDL_SetError("Couldn't get hardware config: %s",
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
441 SDL_NAME(snd_strerror) (status));
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parents: 1664
diff changeset
442 ALSA_CloseAudio(this);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
443 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
444 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
445
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
446 /* SDL only uses interleaved sample output */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
447 status =
1668
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diff changeset
448 SDL_NAME(snd_pcm_hw_params_set_access) (pcm_handle, hwparams,
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parents: 1664
diff changeset
449 SND_PCM_ACCESS_RW_INTERLEAVED);
1662
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parents: 1553
diff changeset
450 if (status < 0) {
1668
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diff changeset
451 SDL_SetError("Couldn't set interleaved access: %s",
4da1ee79c9af more tweaking indent options
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diff changeset
452 SDL_NAME(snd_strerror) (status));
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diff changeset
453 ALSA_CloseAudio(this);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
454 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
455 }
0
74212992fb08 Initial revision
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parents:
diff changeset
456
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parents: 1553
diff changeset
457 /* Try for a closest match on audio format */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
458 status = -1;
1668
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diff changeset
459 for (test_format = SDL_FirstAudioFormat(spec->format);
1662
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diff changeset
460 test_format && (status < 0);) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
461 switch (test_format) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
462 case AUDIO_U8:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
463 format = SND_PCM_FORMAT_U8;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
464 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
465 case AUDIO_S8:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
466 format = SND_PCM_FORMAT_S8;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
467 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
468 case AUDIO_S16LSB:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
469 format = SND_PCM_FORMAT_S16_LE;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
470 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
471 case AUDIO_S16MSB:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
472 format = SND_PCM_FORMAT_S16_BE;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
473 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
474 case AUDIO_U16LSB:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
475 format = SND_PCM_FORMAT_U16_LE;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
476 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
477 case AUDIO_U16MSB:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
478 format = SND_PCM_FORMAT_U16_BE;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
479 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
480 default:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
481 format = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
482 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
483 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
484 if (format != 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
485 status =
1668
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
486 SDL_NAME(snd_pcm_hw_params_set_format) (pcm_handle,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
487 hwparams, format);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
488 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
489 if (status < 0) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
490 test_format = SDL_NextAudioFormat();
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
491 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
492 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
493 if (status < 0) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
494 SDL_SetError("Couldn't find any hardware audio formats");
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
495 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
496 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
497 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
498 spec->format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
500 /* Set the number of channels */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
501 status =
1668
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
502 SDL_NAME(snd_pcm_hw_params_set_channels) (pcm_handle, hwparams,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
503 spec->channels);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
504 if (status < 0) {
1668
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
505 status = SDL_NAME(snd_pcm_hw_params_get_channels) (hwparams);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
506 if ((status <= 0) || (status > 2)) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
507 SDL_SetError("Couldn't set audio channels");
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
508 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
509 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
510 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
511 spec->channels = status;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
512 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
514 /* Set the audio rate */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
515 status =
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
516 SDL_NAME(snd_pcm_hw_params_set_rate_near) (pcm_handle, hwparams,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
517 spec->freq, NULL);
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Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
518 if (status < 0) {
1668
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diff changeset
519 SDL_SetError("Couldn't set audio frequency: %s",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
520 SDL_NAME(snd_strerror) (status));
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diff changeset
521 ALSA_CloseAudio(this);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
522 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
523 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
524 spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
526 /* Set the buffer size, in samples */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
527 frames = spec->samples;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
528 frames =
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parents: 1664
diff changeset
529 SDL_NAME(snd_pcm_hw_params_set_period_size_near) (pcm_handle,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
530 hwparams, frames,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
531 NULL);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
532 spec->samples = frames;
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parents: 1664
diff changeset
533 SDL_NAME(snd_pcm_hw_params_set_periods_near) (pcm_handle, hwparams, 2,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
534 NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
535
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
536 /* "set" the hardware with the desired parameters */
1668
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parents: 1664
diff changeset
537 status = SDL_NAME(snd_pcm_hw_params) (pcm_handle, hwparams);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
538 if (status < 0) {
1668
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parents: 1664
diff changeset
539 SDL_SetError("Couldn't set hardware audio parameters: %s",
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
540 SDL_NAME(snd_strerror) (status));
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
541 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
542 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
543 }
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
544
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
545 /* This is useful for debugging... */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
546 /*
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
547 { snd_pcm_sframes_t bufsize; int fragments;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
548 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
549 fragments = SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
550
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
551 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
552 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
553 */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
554
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
555 /* Set the software parameters */
1668
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parents: 1664
diff changeset
556 snd_pcm_sw_params_alloca(&swparams);
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parents: 1664
diff changeset
557 status = SDL_NAME(snd_pcm_sw_params_current) (pcm_handle, swparams);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1553
diff changeset
558 if (status < 0) {
1668
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parents: 1664
diff changeset
559 SDL_SetError("Couldn't get software config: %s",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
560 SDL_NAME(snd_strerror) (status));
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
561 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
562 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
563 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
564 status =
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parents: 1664
diff changeset
565 SDL_NAME(snd_pcm_sw_params_set_start_threshold) (pcm_handle,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
566 swparams, 0);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
567 if (status < 0) {
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
568 SDL_SetError("Couldn't set start threshold: %s",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
569 SDL_NAME(snd_strerror) (status));
4da1ee79c9af more tweaking indent options
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parents: 1664
diff changeset
570 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
571 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
572 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
573 status =
1668
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parents: 1664
diff changeset
574 SDL_NAME(snd_pcm_sw_params_set_avail_min) (pcm_handle, swparams,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
575 frames);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
576 if (status < 0) {
1668
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parents: 1664
diff changeset
577 SDL_SetError("Couldn't set avail min: %s",
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
578 SDL_NAME(snd_strerror) (status));
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
579 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
580 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
581 }
1668
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parents: 1664
diff changeset
582 status = SDL_NAME(snd_pcm_sw_params) (pcm_handle, swparams);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
583 if (status < 0) {
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
584 SDL_SetError("Couldn't set software audio parameters: %s",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
585 SDL_NAME(snd_strerror) (status));
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
586 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
587 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
588 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
590 /* Calculate the final parameters for this audio specification */
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
591 SDL_CalculateAudioSpec(spec);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
592
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
593 /* Allocate mixing buffer */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
594 mixlen = spec->size;
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
595 mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
596 if (mixbuf == NULL) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
597 ALSA_CloseAudio(this);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
598 return (-1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
599 }
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
600 SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
602 /* Get the parent process id (we're the parent of the audio thread) */
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
603 parent = getpid();
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
604
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
605 /* Switch to blocking mode for playback */
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1664
diff changeset
606 SDL_NAME(snd_pcm_nonblock) (pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
607
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
608 /* We're ready to rock and roll. :-) */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
609 return (0);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
610 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
611
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
612 /* vi: set ts=4 sw=4 expandtab: */