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annotate src/audio/alsa/SDL_alsa_audio.c @ 1663:11775724e3fe SDL-1.3

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fine tuning indent output
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:29:03 +0000
parents 782fd950bd46
children cd3db072ba8a
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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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
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71 size);
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72 static int (*SDL_NAME (snd_pcm_resume)) (snd_pcm_t * pcm);
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73 static int (*SDL_NAME (snd_pcm_prepare)) (snd_pcm_t * pcm);
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74 static int (*SDL_NAME (snd_pcm_drain)) (snd_pcm_t * pcm);
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75 static const char *(*SDL_NAME (snd_strerror)) (int errnum);
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76 static size_t (*SDL_NAME (snd_pcm_hw_params_sizeof)) (void);
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77 static size_t (*SDL_NAME (snd_pcm_sw_params_sizeof)) (void);
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78 static int (*SDL_NAME (snd_pcm_hw_params_any)) (snd_pcm_t * pcm,
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79 snd_pcm_hw_params_t * params);
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80 static int (*SDL_NAME (snd_pcm_hw_params_set_access)) (snd_pcm_t * pcm,
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81 snd_pcm_hw_params_t *
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82 params,
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83 snd_pcm_access_t
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84 access);
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85 static int (*SDL_NAME (snd_pcm_hw_params_set_format)) (snd_pcm_t * pcm,
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86 snd_pcm_hw_params_t *
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87 params,
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88 snd_pcm_format_t val);
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89 static int (*SDL_NAME (snd_pcm_hw_params_set_channels)) (snd_pcm_t * pcm,
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90 snd_pcm_hw_params_t *
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91 params,
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92 unsigned int val);
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93 static int (*SDL_NAME (snd_pcm_hw_params_get_channels)) (const
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94 snd_pcm_hw_params_t *
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95 params);
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96 static unsigned int
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97 (*SDL_NAME (snd_pcm_hw_params_set_rate_near)) (snd_pcm_t *
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98 pcm,
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99 snd_pcm_hw_params_t
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100 * params,
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101 unsigned
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102 int val, int *dir);
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103 static snd_pcm_uframes_t
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104 (*SDL_NAME (snd_pcm_hw_params_set_period_size_near)) (snd_pcm_t * pcm,
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105 snd_pcm_hw_params_t
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106 * params,
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107 snd_pcm_uframes_t
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108 val, int *dir);
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109 static
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110 snd_pcm_sframes_t (*SDL_NAME (snd_pcm_hw_params_get_period_size)) (const
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111 snd_pcm_hw_params_t
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112 *
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113 params);
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114 static unsigned
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115 int (*SDL_NAME (snd_pcm_hw_params_set_periods_near)) (snd_pcm_t * pcm,
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116 snd_pcm_hw_params_t
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117 * params,
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118 unsigned int val,
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119 int *dir);
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120 static int (*SDL_NAME (snd_pcm_hw_params_get_periods)) (snd_pcm_hw_params_t *
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121 params);
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122 static int (*SDL_NAME (snd_pcm_hw_params)) (snd_pcm_t * pcm,
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123 snd_pcm_hw_params_t * params);
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124 /*
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125 */
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126 static int (*SDL_NAME (snd_pcm_sw_params_current)) (snd_pcm_t * pcm,
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127 snd_pcm_sw_params_t *
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128 swparams);
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129 static int (*SDL_NAME (snd_pcm_sw_params_set_start_threshold)) (snd_pcm_t *
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130 pcm,
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131 snd_pcm_sw_params_t
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132 * params,
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133 snd_pcm_uframes_t
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134 val);
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135 static int (*SDL_NAME (snd_pcm_sw_params_set_avail_min)) (snd_pcm_t * pcm,
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136 snd_pcm_sw_params_t
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137 * params,
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138 snd_pcm_uframes_t
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139 val);
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140 static int (*SDL_NAME (snd_pcm_sw_params)) (snd_pcm_t * pcm,
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141 snd_pcm_sw_params_t * params);
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142 static int (*SDL_NAME (snd_pcm_nonblock)) (snd_pcm_t * pcm, int nonblock);
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143 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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144 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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145
1161
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast.
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146 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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147 static struct
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148 {
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149 const char *name;
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150 void **func;
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151 } alsa_functions[] = {
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152 {
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153 "snd_pcm_open", (void **) (char *) &SDL_NAME (snd_pcm_open)}, {
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154 "snd_pcm_close", (void **) (char *) &SDL_NAME (snd_pcm_close)}, {
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155 "snd_pcm_writei", (void **) (char *) &SDL_NAME (snd_pcm_writei)}, {
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156 "snd_pcm_resume", (void **) (char *) &SDL_NAME (snd_pcm_resume)}, {
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157 "snd_pcm_prepare", (void **) (char *) &SDL_NAME (snd_pcm_prepare)}, {
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158 "snd_pcm_drain", (void **) (char *) &SDL_NAME (snd_pcm_drain)}, {
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159 "snd_strerror", (void **) (char *) &SDL_NAME (snd_strerror)}, {
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160 "snd_pcm_hw_params_sizeof",
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161 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_sizeof)}, {
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diff changeset
162 "snd_pcm_sw_params_sizeof",
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163 (void **) (char *) &SDL_NAME (snd_pcm_sw_params_sizeof)}, {
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164 "snd_pcm_hw_params_any",
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165 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_any)}, {
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166 "snd_pcm_hw_params_set_access",
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diff changeset
167 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_set_access)}, {
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168 "snd_pcm_hw_params_set_format",
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169 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_set_format)}, {
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170 "snd_pcm_hw_params_set_channels",
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171 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_set_channels)}, {
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172 "snd_pcm_hw_params_get_channels",
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173 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_get_channels)}, {
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174 "snd_pcm_hw_params_set_rate_near",
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175 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_set_rate_near)}, {
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176 "snd_pcm_hw_params_set_period_size_near", (void **) (char *)
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diff changeset
177 &SDL_NAME (snd_pcm_hw_params_set_period_size_near)}, {
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178 "snd_pcm_hw_params_get_period_size",
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179 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_get_period_size)},
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180 {
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diff changeset
181 "snd_pcm_hw_params_set_periods_near", (void **) (char *)
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182 &SDL_NAME (snd_pcm_hw_params_set_periods_near)}, {
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183 "snd_pcm_hw_params_get_periods",
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184 (void **) (char *) &SDL_NAME (snd_pcm_hw_params_get_periods)}, {
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diff changeset
185 "snd_pcm_hw_params", (void **) (char *) &SDL_NAME (snd_pcm_hw_params)}, {
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186 "snd_pcm_sw_params_current",
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diff changeset
187 (void **) (char *) &SDL_NAME (snd_pcm_sw_params_current)}, {
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diff changeset
188 "snd_pcm_sw_params_set_start_threshold", (void **) (char *)
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diff changeset
189 &SDL_NAME (snd_pcm_sw_params_set_start_threshold)}, {
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diff changeset
190 "snd_pcm_sw_params_set_avail_min",
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diff changeset
191 (void **) (char *) &SDL_NAME (snd_pcm_sw_params_set_avail_min)}, {
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diff changeset
192 "snd_pcm_sw_params", (void **) (char *) &SDL_NAME (snd_pcm_sw_params)}, {
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diff changeset
193 "snd_pcm_nonblock", (void **) (char *) &SDL_NAME (snd_pcm_nonblock)},};
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194
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195 static void
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196 UnloadALSALibrary (void)
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197 {
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198 if (alsa_loaded) {
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199 /* SDL_UnloadObject(alsa_handle);*/
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200 dlclose (alsa_handle);
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201 alsa_handle = NULL;
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202 alsa_loaded = 0;
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203 }
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204 }
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205
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206 static int
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207 LoadALSALibrary (void)
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208 {
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diff changeset
209 int i, retval = -1;
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210
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211 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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212 alsa_handle = dlopen (alsa_library, RTLD_NOW);
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213 if (alsa_handle) {
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214 alsa_loaded = 1;
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215 retval = 0;
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216 for (i = 0; i < SDL_arraysize (alsa_functions); i++) {
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217 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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diff changeset
218 #if HAVE_DLVSYM
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219 *alsa_functions[i].func =
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220 dlvsym (alsa_handle, alsa_functions[i].name, "ALSA_0.9");
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diff changeset
221 if (!*alsa_functions[i].func)
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diff changeset
222 #endif
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223 *alsa_functions[i].func =
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diff changeset
224 dlsym (alsa_handle, alsa_functions[i].name);
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diff changeset
225 if (!*alsa_functions[i].func) {
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226 retval = -1;
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227 UnloadALSALibrary ();
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diff changeset
228 break;
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diff changeset
229 }
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230 }
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231 }
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diff changeset
232 return retval;
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233 }
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234
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diff changeset
235 #else
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236
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237 static void
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238 UnloadALSALibrary (void)
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239 {
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240 return;
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241 }
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242
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243 static int
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244 LoadALSALibrary (void)
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245 {
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246 return 0;
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247 }
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248
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249 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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250
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251 static const char *
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252 get_audio_device (int channels)
354
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253 {
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254 const char *device;
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255
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256 device = SDL_getenv ("AUDIODEV"); /* Is there a standard variable name? */
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257 if (device == NULL) {
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258 if (channels == 6)
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259 device = "surround51";
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260 else if (channels == 4)
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261 device = "surround40";
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262 else
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263 device = DEFAULT_DEVICE;
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264 }
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265 return device;
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266 }
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267
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268 /* Audio driver bootstrap functions */
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269
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270 static int
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271 Audio_Available (void)
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272 {
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273 int available;
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274 int status;
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275 snd_pcm_t *handle;
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276
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277 available = 0;
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278 if (LoadALSALibrary () < 0) {
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279 return available;
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280 }
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281 status =
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282 SDL_NAME (snd_pcm_open) (&handle, get_audio_device (2),
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283 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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284 if (status >= 0) {
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285 available = 1;
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286 SDL_NAME (snd_pcm_close) (handle);
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287 }
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288 UnloadALSALibrary ();
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289 return (available);
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290 }
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291
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292 static void
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293 Audio_DeleteDevice (SDL_AudioDevice * device)
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294 {
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295 SDL_free (device->hidden);
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296 SDL_free (device);
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297 UnloadALSALibrary ();
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298 }
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299
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300 static SDL_AudioDevice *
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301 Audio_CreateDevice (int devindex)
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302 {
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303 SDL_AudioDevice *this;
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304
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305 /* Initialize all variables that we clean on shutdown */
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306 LoadALSALibrary ();
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307 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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308 if (this) {
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309 SDL_memset (this, 0, (sizeof *this));
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310 this->hidden = (struct SDL_PrivateAudioData *)
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311 SDL_malloc ((sizeof *this->hidden));
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312 }
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313 if ((this == NULL) || (this->hidden == NULL)) {
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314 SDL_OutOfMemory ();
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315 if (this) {
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316 SDL_free (this);
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317 }
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318 return (0);
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319 }
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320 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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321
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322 /* Set the function pointers */
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323 this->OpenAudio = ALSA_OpenAudio;
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324 this->WaitAudio = ALSA_WaitAudio;
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325 this->PlayAudio = ALSA_PlayAudio;
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326 this->GetAudioBuf = ALSA_GetAudioBuf;
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327 this->CloseAudio = ALSA_CloseAudio;
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328
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329 this->free = Audio_DeleteDevice;
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330
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331 return this;
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332 }
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333
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334 AudioBootStrap ALSA_bootstrap = {
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335 DRIVER_NAME, "ALSA 0.9 PCM audio",
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336 Audio_Available, Audio_CreateDevice
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337 };
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338
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339 /* This function waits until it is possible to write a full sound buffer */
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340 static void
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341 ALSA_WaitAudio (_THIS)
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342 {
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343 /* Check to see if the thread-parent process is still alive */
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344 {
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345 static int cnt = 0;
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346 /* Note that this only works with thread implementations
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347 that use a different process id for each thread.
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348 */
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349 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
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350 if (kill (parent, 0) < 0) {
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351 this->enabled = 0;
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352 }
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353 }
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354 }
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355 }
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356
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357 static void
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358 ALSA_PlayAudio (_THIS)
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359 {
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360 int status;
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361 int sample_len;
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362 signed short *sample_buf;
765
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363
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diff changeset
364 sample_len = this->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
365 sample_buf = (signed short *) mixbuf;
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
366 while (sample_len > 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
367 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
368 SDL_NAME (snd_pcm_writei) (pcm_handle, sample_buf, sample_len);
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
369 if (status < 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
370 if (status == -EAGAIN) {
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
371 SDL_Delay (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
372 continue;
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
373 }
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
374 if (status == -ESTRPIPE) {
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
375 do {
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
376 SDL_Delay (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
377 status = SDL_NAME (snd_pcm_resume) (pcm_handle);
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
378 }
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
379 while (status == -EAGAIN);
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
380 }
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
381 if (status < 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
382 status = SDL_NAME (snd_pcm_prepare) (pcm_handle);
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
383 }
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
384 if (status < 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
385 /* Hmm, not much we can do - abort */
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
386 this->enabled = 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
387 return;
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
388 }
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
389 continue;
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
390 }
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
391 sample_buf += status * this->spec.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
392 sample_len -= 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
393 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
396 static Uint8 *
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
397 ALSA_GetAudioBuf (_THIS)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 {
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
399 return (mixbuf);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
402 static void
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
403 ALSA_CloseAudio (_THIS)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 {
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
405 if (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
406 SDL_FreeAudioMem (mixbuf);
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
407 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
408 }
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
409 if (pcm_handle) {
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
410 SDL_NAME (snd_pcm_drain) (pcm_handle);
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
411 SDL_NAME (snd_pcm_close) (pcm_handle);
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
412 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
413 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415
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
416 static int
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
417 ALSA_OpenAudio (_THIS, SDL_AudioSpec * spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 {
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
419 int 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
420 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
421 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
422 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
423 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
424 Uint16 test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425
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
426 /* 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
427 /* 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
428 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
429 SDL_NAME (snd_pcm_open) (&pcm_handle,
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
430 get_audio_device (spec->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
431 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
432
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
433 if (status < 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
434 SDL_SetError ("Couldn't open audio device: %s",
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
435 SDL_NAME (snd_strerror) (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
436 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
437 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
438
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
439 /* Figure out what the hardware is capable of */
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
440 snd_pcm_hw_params_alloca (&hwparams);
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
441 status = SDL_NAME (snd_pcm_hw_params_any) (pcm_handle, hwparams);
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
442 if (status < 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
443 SDL_SetError ("Couldn't get hardware config: %s",
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
444 SDL_NAME (snd_strerror) (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
445 ALSA_CloseAudio (this);
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
446 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
447 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
448
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
449 /* 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
450 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
451 SDL_NAME (snd_pcm_hw_params_set_access) (pcm_handle, hwparams,
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
452 SND_PCM_ACCESS_RW_INTERLEAVED);
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
453 if (status < 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
454 SDL_SetError ("Couldn't set interleaved access: %s",
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
455 SDL_NAME (snd_strerror) (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
456 ALSA_CloseAudio (this);
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
457 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
458 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459
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
460 /* 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
461 status = -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
462 for (test_format = SDL_FirstAudioFormat (spec->format);
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 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
464 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.
Sam Lantinga <slouken@libsdl.org>
parents: 1553
diff changeset
465 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
466 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
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_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
469 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
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_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
472 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
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_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
475 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
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_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
478 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
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 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
481 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
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 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
484 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 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
486 }
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
487 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
488 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
489 SDL_NAME (snd_pcm_hw_params_set_format) (pcm_handle,
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
490 hwparams, format);
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 if (status < 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
493 test_format = SDL_NextAudioFormat ();
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
494 }
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
495 }
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 if (status < 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
497 SDL_SetError ("Couldn't find any hardware audio formats");
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 ALSA_CloseAudio (this);
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
499 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
500 }
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 spec->format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502
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
503 /* 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
504 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
505 SDL_NAME (snd_pcm_hw_params_set_channels) (pcm_handle, hwparams,
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 spec->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
507 if (status < 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
508 status = SDL_NAME (snd_pcm_hw_params_get_channels) (hwparams);
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 if ((status <= 0) || (status > 2)) {
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 SDL_SetError ("Couldn't set audio 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
511 ALSA_CloseAudio (this);
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 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
513 }
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 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
515 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516
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
517 /* 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
518 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
519 SDL_NAME (snd_pcm_hw_params_set_rate_near) (pcm_handle, hwparams,
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
520 spec->freq, 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
521 if (status < 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
522 SDL_SetError ("Couldn't set audio frequency: %s",
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 SDL_NAME (snd_strerror) (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
524 ALSA_CloseAudio (this);
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
525 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
526 }
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 spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528
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
529 /* 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
530 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
531 frames =
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 SDL_NAME (snd_pcm_hw_params_set_period_size_near) (pcm_handle,
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
533 hwparams, frames,
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
534 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
535 spec->samples = frames;
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 SDL_NAME (snd_pcm_hw_params_set_periods_near) (pcm_handle, hwparams, 2,
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
537 NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
538
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
539 /* "set" the hardware with the desired parameters */
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
540 status = SDL_NAME (snd_pcm_hw_params) (pcm_handle, hwparams);
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
541 if (status < 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
542 SDL_SetError ("Couldn't set hardware audio parameters: %s",
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 SDL_NAME (snd_strerror) (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
544 ALSA_CloseAudio (this);
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
545 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
546 }
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
547
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
548 /* This is useful for debugging... */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
549 /*
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
550 { snd_pcm_sframes_t bufsize; int fragments;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
551 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
552 fragments = SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams);
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 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
555 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
556 */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
557
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
558 /* Set the software parameters */
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
559 snd_pcm_sw_params_alloca (&swparams);
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
560 status = SDL_NAME (snd_pcm_sw_params_current) (pcm_handle, swparams);
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
561 if (status < 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
562 SDL_SetError ("Couldn't get software config: %s",
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 SDL_NAME (snd_strerror) (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
564 ALSA_CloseAudio (this);
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
565 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
566 }
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 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
568 SDL_NAME (snd_pcm_sw_params_set_start_threshold) (pcm_handle,
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
569 swparams, 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
570 if (status < 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
571 SDL_SetError ("Couldn't set start threshold: %s",
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 SDL_NAME (snd_strerror) (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
573 ALSA_CloseAudio (this);
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
574 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
575 }
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 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
577 SDL_NAME (snd_pcm_sw_params_set_avail_min) (pcm_handle, swparams,
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
578 frames);
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
579 if (status < 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
580 SDL_SetError ("Couldn't set avail min: %s",
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 SDL_NAME (snd_strerror) (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
582 ALSA_CloseAudio (this);
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 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
584 }
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
585 status = SDL_NAME (snd_pcm_sw_params) (pcm_handle, swparams);
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
586 if (status < 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
587 SDL_SetError ("Couldn't set software audio parameters: %s",
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 SDL_NAME (snd_strerror) (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
589 ALSA_CloseAudio (this);
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 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
591 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
592
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
593 /* Calculate the final parameters for this audio specification */
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 SDL_CalculateAudioSpec (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
595
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 /* 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
597 mixlen = spec->size;
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 mixbuf = (Uint8 *) SDL_AllocAudioMem (mixlen);
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 if (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
600 ALSA_CloseAudio (this);
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
601 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
602 }
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
603 SDL_memset (mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604
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
605 /* Get the parent process id (we're the parent of the audio thread) */
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
606 parent = getpid ();
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
607
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 /* Switch to blocking mode for playback */
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 SDL_NAME (snd_pcm_nonblock) (pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
610
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
611 /* 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
612 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
613 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614
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
615 /* vi: set ts=4 sw=4 expandtab: */