annotate src/audio/alsa/SDL_alsa_audio.c @ 914:bbf8dcc8aed6

Date: Wed, 23 Jun 2004 17:05:33 -0400 From: Chris Nelson Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick) In the current cvs version, SDL doesn't handle these Playstation2 controller => USB adapters correctly, in linux. It will always assume that the maximum number of joysticks (2 in the case of the MP-8866, 4 in the case of the 8800) are plugged in. This is bad not only because it allows SDL to exaggerate the number of logical joysticks, but primarily because the joystick axes are mapped incorrectly, all over the place, such that the devices are effectively unusable unless you have the maximum number of joysticks plugged in. My changes to src/joystick/linux/SDL_sysjoystick.c build on another's previous work (which was a special case for this very joystick, actually), and fix both of these problems, as well as making the current code a little more general, to allow for others to more easily drop in code for quirky joysticks such as these. I've tested this code under 2.6.7 as well as 2.4.24... Both work as advertised (provided you load the JOYDEV linux code as a module, otherwise they won't work at all, new code or old, but that's another issue entirely). Though this sounds horribly formal, you have my permission to distribute all of my work on this issue under the LGPL. So there.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 25 Jul 2004 18:31:50 +0000
parents 92615154bb68
children c7c04f811994
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23
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24
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25 /* Allow access to a raw mixing buffer */
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26
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29 #include <string.h>
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <signal.h>
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34 #include <sys/types.h>
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35 #include <sys/time.h>
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36
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37 #include "SDL_audio.h"
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38 #include "SDL_error.h"
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39 #include "SDL_audiomem.h"
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40 #include "SDL_audio_c.h"
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41 #include "SDL_timer.h"
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42 #include "SDL_alsa_audio.h"
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43
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44 #ifdef ALSA_DYNAMIC
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45 #define __USE_GNU
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46 #include <dlfcn.h>
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47 #include "SDL_name.h"
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48 #include "SDL_loadso.h"
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49 #else
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50 #define SDL_NAME(X) X
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51 #endif
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52
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53
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54 /* The tag name used by ALSA audio */
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55 #define DRIVER_NAME "alsa"
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56
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57 /* The default ALSA audio driver */
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58 #define DEFAULT_DEVICE "default"
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59
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60 /* Audio driver functions */
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61 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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62 static void ALSA_WaitAudio(_THIS);
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63 static void ALSA_PlayAudio(_THIS);
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64 static Uint8 *ALSA_GetAudioBuf(_THIS);
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65 static void ALSA_CloseAudio(_THIS);
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66
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67 #ifdef ALSA_DYNAMIC
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68
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69 static const char *alsa_library = ALSA_DYNAMIC;
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70 static void *alsa_handle = NULL;
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71 static int alsa_loaded = 0;
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72
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73 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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74 static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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75 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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76 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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77 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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78 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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79 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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80 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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81 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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82 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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83 static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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84 static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
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85 static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
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86 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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87 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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88 static snd_pcm_uframes_t (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int *dir);
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89 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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90 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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91 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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92 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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93
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94 static struct {
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95 const char *name;
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96 void **func;
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97 } alsa_functions[] = {
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98 { "snd_pcm_open", (void**)&SDL_NAME(snd_pcm_open) },
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99 { "snd_pcm_close", (void**)&SDL_NAME(snd_pcm_close) },
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100 { "snd_pcm_writei", (void**)&SDL_NAME(snd_pcm_writei) },
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101 { "snd_pcm_resume", (void**)&SDL_NAME(snd_pcm_resume) },
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102 { "snd_pcm_prepare", (void**)&SDL_NAME(snd_pcm_prepare) },
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103 { "snd_pcm_drain", (void**)&SDL_NAME(snd_pcm_drain) },
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104 { "snd_strerror", (void**)&SDL_NAME(snd_strerror) },
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105 { "snd_pcm_hw_params_sizeof", (void**)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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106 { "snd_pcm_hw_params_any", (void**)&SDL_NAME(snd_pcm_hw_params_any) },
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107 { "snd_pcm_hw_params_set_access", (void**)&SDL_NAME(snd_pcm_hw_params_set_access) },
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108 { "snd_pcm_hw_params_set_format", (void**)&SDL_NAME(snd_pcm_hw_params_set_format) },
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109 { "snd_pcm_hw_params_set_channels", (void**)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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110 { "snd_pcm_hw_params_get_channels", (void**)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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111 { "snd_pcm_hw_params_set_rate_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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112 { "snd_pcm_hw_params_set_period_size_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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113 { "snd_pcm_hw_params_set_periods_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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114 { "snd_pcm_hw_params", (void**)&SDL_NAME(snd_pcm_hw_params) },
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115 { "snd_pcm_nonblock", (void**)&SDL_NAME(snd_pcm_nonblock) },
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116 };
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117
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118 static void UnloadALSALibrary(void) {
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119 if (alsa_loaded) {
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120 /* SDL_UnloadObject(alsa_handle);*/
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121 dlclose(alsa_handle);
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122 alsa_handle = NULL;
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123 alsa_loaded = 0;
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124 }
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125 }
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126
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127 static int LoadALSALibrary(void) {
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128 int i, retval = -1;
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129
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130 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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131 alsa_handle = dlopen(alsa_library,RTLD_NOW);
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132 if (alsa_handle) {
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133 alsa_loaded = 1;
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134 retval = 0;
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135 for (i = 0; i < SDL_TABLESIZE(alsa_functions); i++) {
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136 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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137 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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138 if (!*alsa_functions[i].func) {
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139 retval = -1;
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140 UnloadALSALibrary();
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141 break;
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142 }
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143 }
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144 }
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145 return retval;
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146 }
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147
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148 #else
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149
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150 static void UnloadALSALibrary(void) {
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151 return;
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152 }
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153
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154 static int LoadALSALibrary(void) {
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155 return 0;
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156 }
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157
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158 #endif /* ALSA_DYNAMIC */
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159
354
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160 static const char *get_audio_device()
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161 {
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162 const char *device;
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163
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164 device = getenv("AUDIODEV"); /* Is there a standard variable name? */
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165 if ( device == NULL ) {
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166 device = DEFAULT_DEVICE;
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167 }
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168 return device;
0
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169 }
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170
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171 /* Audio driver bootstrap functions */
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172
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173 static int Audio_Available(void)
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174 {
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175 int available;
354
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176 int status;
0
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177 snd_pcm_t *handle;
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178
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179 available = 0;
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180 if (LoadALSALibrary() < 0) {
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181 return available;
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182 }
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183 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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184 if ( status >= 0 ) {
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185 available = 1;
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186 SDL_NAME(snd_pcm_close)(handle);
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187 }
865
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188 UnloadALSALibrary();
0
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189 return(available);
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190 }
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191
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192 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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193 {
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194 free(device->hidden);
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195 free(device);
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196 UnloadALSALibrary();
0
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197 }
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198
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199 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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200 {
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201 SDL_AudioDevice *this;
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202
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203 /* Initialize all variables that we clean on shutdown */
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204 LoadALSALibrary();
0
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205 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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206 if ( this ) {
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207 memset(this, 0, (sizeof *this));
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208 this->hidden = (struct SDL_PrivateAudioData *)
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209 malloc((sizeof *this->hidden));
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210 }
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211 if ( (this == NULL) || (this->hidden == NULL) ) {
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212 SDL_OutOfMemory();
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213 if ( this ) {
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214 free(this);
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diff changeset
215 }
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216 return(0);
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217 }
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218 memset(this->hidden, 0, (sizeof *this->hidden));
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219
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220 /* Set the function pointers */
354
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diff changeset
221 this->OpenAudio = ALSA_OpenAudio;
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diff changeset
222 this->WaitAudio = ALSA_WaitAudio;
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diff changeset
223 this->PlayAudio = ALSA_PlayAudio;
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diff changeset
224 this->GetAudioBuf = ALSA_GetAudioBuf;
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225 this->CloseAudio = ALSA_CloseAudio;
0
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226
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227 this->free = Audio_DeleteDevice;
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diff changeset
228
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229 return this;
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230 }
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231
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diff changeset
232 AudioBootStrap ALSA_bootstrap = {
354
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diff changeset
233 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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diff changeset
234 Audio_Available, Audio_CreateDevice
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235 };
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diff changeset
236
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237 /* This function waits until it is possible to write a full sound buffer */
354
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diff changeset
238 static void ALSA_WaitAudio(_THIS)
0
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diff changeset
239 {
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diff changeset
240 /* Check to see if the thread-parent process is still alive */
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diff changeset
241 { static int cnt = 0;
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diff changeset
242 /* Note that this only works with thread implementations
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diff changeset
243 that use a different process id for each thread.
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diff changeset
244 */
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diff changeset
245 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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parents:
diff changeset
246 if ( kill(parent, 0) < 0 ) {
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diff changeset
247 this->enabled = 0;
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diff changeset
248 }
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249 }
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250 }
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251 }
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diff changeset
252
354
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diff changeset
253 static void ALSA_PlayAudio(_THIS)
0
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diff changeset
254 {
354
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diff changeset
255 int status;
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diff changeset
256 int sample_len;
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diff changeset
257 signed short *sample_buf;
765
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diff changeset
258
354
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diff changeset
259 sample_len = this->spec.samples;
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diff changeset
260 sample_buf = (signed short *)mixbuf;
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diff changeset
261 while ( sample_len > 0 ) {
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262 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354
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diff changeset
263 if ( status < 0 ) {
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diff changeset
264 if ( status == -EAGAIN ) {
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
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diff changeset
265 SDL_Delay(1);
354
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diff changeset
266 continue;
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diff changeset
267 }
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diff changeset
268 if ( status == -ESTRPIPE ) {
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diff changeset
269 do {
765
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diff changeset
270 SDL_Delay(1);
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271 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
272 } while ( status == -EAGAIN );
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diff changeset
273 }
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diff changeset
274 if ( status < 0 ) {
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275 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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diff changeset
276 }
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diff changeset
277 if ( status < 0 ) {
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diff changeset
278 /* Hmm, not much we can do - abort */
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diff changeset
279 this->enabled = 0;
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diff changeset
280 return;
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281 }
356
a1e54d1ba16f *** empty log message ***
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diff changeset
282 continue;
0
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diff changeset
283 }
354
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diff changeset
284 sample_buf += status * this->spec.channels;
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diff changeset
285 sample_len -= status;
0
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286 }
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287 }
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288
354
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diff changeset
289 static Uint8 *ALSA_GetAudioBuf(_THIS)
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290 {
354
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diff changeset
291 return(mixbuf);
0
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292 }
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293
354
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diff changeset
294 static void ALSA_CloseAudio(_THIS)
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295 {
354
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diff changeset
296 if ( mixbuf != NULL ) {
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diff changeset
297 SDL_FreeAudioMem(mixbuf);
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diff changeset
298 mixbuf = NULL;
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299 }
354
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diff changeset
300 if ( pcm_handle ) {
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diff changeset
301 SDL_NAME(snd_pcm_drain)(pcm_handle);
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302 SDL_NAME(snd_pcm_close)(pcm_handle);
354
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diff changeset
303 pcm_handle = NULL;
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304 }
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305 }
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306
354
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diff changeset
307 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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308 {
354
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diff changeset
309 int status;
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diff changeset
310 snd_pcm_hw_params_t *params;
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diff changeset
311 snd_pcm_format_t format;
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diff changeset
312 snd_pcm_uframes_t frames;
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diff changeset
313 Uint16 test_format;
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314
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315 /* Open the audio device */
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316 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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diff changeset
317 if ( status < 0 ) {
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318 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
319 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
320 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
321
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diff changeset
322 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
323 snd_pcm_hw_params_alloca(&params);
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324 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, params);
354
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diff changeset
325 if ( status < 0 ) {
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diff changeset
326 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
327 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
328 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
329 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
330
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
331 /* SDL only uses interleaved sample output */
865
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diff changeset
332 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
354
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diff changeset
333 if ( status < 0 ) {
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diff changeset
334 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
335 ALSA_CloseAudio(this);
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336 return(-1);
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337 }
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338
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339 /* Try for a closest match on audio format */
354
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diff changeset
340 status = -1;
0
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341 for ( test_format = SDL_FirstAudioFormat(spec->format);
354
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diff changeset
342 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
343 switch ( test_format ) {
0
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344 case AUDIO_U8:
354
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diff changeset
345 format = SND_PCM_FORMAT_U8;
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346 break;
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347 case AUDIO_S8:
354
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diff changeset
348 format = SND_PCM_FORMAT_S8;
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349 break;
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350 case AUDIO_S16LSB:
354
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diff changeset
351 format = SND_PCM_FORMAT_S16_LE;
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352 break;
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353 case AUDIO_S16MSB:
354
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diff changeset
354 format = SND_PCM_FORMAT_S16_BE;
0
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355 break;
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356 case AUDIO_U16LSB:
354
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diff changeset
357 format = SND_PCM_FORMAT_U16_LE;
0
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358 break;
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359 case AUDIO_U16MSB:
354
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diff changeset
360 format = SND_PCM_FORMAT_U16_BE;
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361 break;
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362 default:
354
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diff changeset
363 format = 0;
0
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diff changeset
364 break;
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diff changeset
365 }
354
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diff changeset
366 if ( format != 0 ) {
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367 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354
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diff changeset
368 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
369 if ( status < 0 ) {
0
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diff changeset
370 test_format = SDL_NextAudioFormat();
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diff changeset
371 }
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diff changeset
372 }
354
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diff changeset
373 if ( status < 0 ) {
0
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diff changeset
374 SDL_SetError("Couldn't find any hardware audio formats");
354
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diff changeset
375 ALSA_CloseAudio(this);
0
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diff changeset
376 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
377 }
74212992fb08 Initial revision
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diff changeset
378 spec->format = test_format;
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parents:
diff changeset
379
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
380 /* Set the number of channels */
865
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diff changeset
381 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, params, spec->channels);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
382 if ( status < 0 ) {
865
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diff changeset
383 status = SDL_NAME(snd_pcm_hw_params_get_channels)(params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
384 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
385 SDL_SetError("Couldn't set audio channels");
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
386 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
387 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
388 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
389 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
390 }
0
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parents:
diff changeset
391
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
392 /* Set the audio rate */
865
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parents: 769
diff changeset
393 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, params, spec->freq, NULL);
354
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parents: 297
diff changeset
394 if ( status < 0 ) {
865
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diff changeset
395 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
396 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
397 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
398 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
399 spec->freq = status;
0
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parents:
diff changeset
400
354
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diff changeset
401 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
402 frames = spec->samples;
865
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parents: 769
diff changeset
403 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, params, frames, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
404 spec->samples = frames;
865
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diff changeset
405 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, params, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
406
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
407 /* "set" the hardware with the desired parameters */
865
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parents: 769
diff changeset
408 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
409 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
410 SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
411 ALSA_CloseAudio(this);
0
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parents:
diff changeset
412 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
413 }
74212992fb08 Initial revision
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parents:
diff changeset
414
354
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diff changeset
415 /* Calculate the final parameters for this audio specification */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
416 SDL_CalculateAudioSpec(spec);
0
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parents:
diff changeset
417
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
418 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
419 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
420 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
421 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
422 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
423 return(-1);
0
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Sam Lantinga <slouken@lokigames.com>
parents:
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424 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
425 memset(mixbuf, spec->silence, spec->size);
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426
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parents:
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427 /* Get the parent process id (we're the parent of the audio thread) */
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parents:
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428 parent = getpid();
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parents:
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429
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
430 /* Switch to blocking mode for playback */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
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431 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
432
0
74212992fb08 Initial revision
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parents:
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433 /* We're ready to rock and roll. :-) */
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parents:
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434 return(0);
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parents:
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435 }