annotate src/audio/alsa/SDL_alsa_audio.c @ 4001:6831b8723a85 SDL-1.2

Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents d7c9d7f42881
children c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include <sys/types.h>
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27 #include <signal.h> /* For kill() */
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audiomem.h"
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32 #include "../SDL_audio_c.h"
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33 #include "SDL_alsa_audio.h"
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34
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35 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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36 #include <dlfcn.h>
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37 #include "SDL_name.h"
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38 #include "SDL_loadso.h"
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39 #else
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40 #define SDL_NAME(X) X
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41 #endif
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42
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43
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44 /* The tag name used by ALSA audio */
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45 #define DRIVER_NAME "alsa"
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46
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47 /* The default ALSA audio driver */
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48 #define DEFAULT_DEVICE "default"
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49
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50 /* Audio driver functions */
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51 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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52 static void ALSA_WaitAudio(_THIS);
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53 static void ALSA_PlayAudio(_THIS);
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54 static Uint8 *ALSA_GetAudioBuf(_THIS);
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55 static void ALSA_CloseAudio(_THIS);
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56
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57 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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58
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59 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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60 static void *alsa_handle = NULL;
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61 static int alsa_loaded = 0;
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62
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63 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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64 static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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65 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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66 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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67 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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68 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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69 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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70 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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71 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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72 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void);
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73 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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74 static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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75 static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
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76 static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
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77 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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78 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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79 static snd_pcm_uframes_t (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int *dir);
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80 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params);
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81 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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82 static int (*SDL_NAME(snd_pcm_hw_params_get_periods))(snd_pcm_hw_params_t *params);
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83 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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84 /*
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85 */
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86 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams);
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87 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
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88 static int (*SDL_NAME(snd_pcm_sw_params_set_avail_min))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
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89 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
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90 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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91 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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92 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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93
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94 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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95 static struct {
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96 const char *name;
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97 void **func;
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98 } alsa_functions[] = {
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99 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) },
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100 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) },
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101 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) },
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102 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) },
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103 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) },
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104 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) },
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105 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) },
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106 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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107 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) },
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108 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) },
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109 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) },
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110 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) },
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111 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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112 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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113 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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114 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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115 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) },
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116 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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117 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) },
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118 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) },
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parents: 1402
diff changeset
119 { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) },
b2462b772cce Fixed bug #79
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parents: 1402
diff changeset
120 { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) },
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parents: 1402
diff changeset
121 { "snd_pcm_sw_params_set_avail_min", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_avail_min) },
b2462b772cce Fixed bug #79
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parents: 1402
diff changeset
122 { "snd_pcm_sw_params", (void**)(char*)&SDL_NAME(snd_pcm_sw_params) },
1553
63fa37538842 Left the debug code more explicit
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parents: 1552
diff changeset
123 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) },
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124 };
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diff changeset
125
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diff changeset
126 static void UnloadALSALibrary(void) {
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diff changeset
127 if (alsa_loaded) {
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diff changeset
128 /* SDL_UnloadObject(alsa_handle);*/
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129 dlclose(alsa_handle);
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130 alsa_handle = NULL;
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131 alsa_loaded = 0;
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132 }
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133 }
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134
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diff changeset
135 static int LoadALSALibrary(void) {
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diff changeset
136 int i, retval = -1;
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parents: 769
diff changeset
137
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138 /* alsa_handle = SDL_LoadObject(alsa_library);*/
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139 alsa_handle = dlopen(alsa_library,RTLD_NOW);
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140 if (alsa_handle) {
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diff changeset
141 alsa_loaded = 1;
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142 retval = 0;
1379
c0a74f199ecf Use only safe string functions
Sam Lantinga <slouken@libsdl.org>
parents: 1361
diff changeset
143 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
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144 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
1361
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Sam Lantinga <slouken@libsdl.org>
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145 #if HAVE_DLVSYM
865
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146 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300
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parents: 865
diff changeset
147 if (!*alsa_functions[i].func)
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parents: 865
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148 #endif
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diff changeset
149 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
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150 if (!*alsa_functions[i].func) {
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diff changeset
151 retval = -1;
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152 UnloadALSALibrary();
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diff changeset
153 break;
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diff changeset
154 }
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diff changeset
155 }
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diff changeset
156 }
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157 return retval;
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diff changeset
158 }
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159
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diff changeset
160 #else
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161
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diff changeset
162 static void UnloadALSALibrary(void) {
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163 return;
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diff changeset
164 }
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165
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diff changeset
166 static int LoadALSALibrary(void) {
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167 return 0;
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168 }
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169
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170 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
865
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171
942
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diff changeset
172 static const char *get_audio_device(int channels)
354
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diff changeset
173 {
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diff changeset
174 const char *device;
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diff changeset
175
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diff changeset
176 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
177 if ( device == NULL ) {
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
diff changeset
178 if (channels == 6) device = "surround51";
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
diff changeset
179 else if (channels == 4) device = "surround40";
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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parents: 939
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180 else device = DEFAULT_DEVICE;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
181 }
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diff changeset
182 return device;
0
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183 }
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parents:
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184
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185 /* Audio driver bootstrap functions */
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parents:
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186
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parents:
diff changeset
187 static int Audio_Available(void)
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parents:
diff changeset
188 {
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parents:
diff changeset
189 int available;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
190 int status;
0
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parents:
diff changeset
191 snd_pcm_t *handle;
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parents:
diff changeset
192
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193 available = 0;
865
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diff changeset
194 if (LoadALSALibrary() < 0) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
195 return available;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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diff changeset
196 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
197 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
198 if ( status >= 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
199 available = 1;
865
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diff changeset
200 SDL_NAME(snd_pcm_close)(handle);
0
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parents:
diff changeset
201 }
865
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diff changeset
202 UnloadALSALibrary();
0
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parents:
diff changeset
203 return(available);
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parents:
diff changeset
204 }
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parents:
diff changeset
205
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parents:
diff changeset
206 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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parents:
diff changeset
207 {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
208 SDL_free(device->hidden);
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1331
diff changeset
209 SDL_free(device);
865
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diff changeset
210 UnloadALSALibrary();
0
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parents:
diff changeset
211 }
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parents:
diff changeset
212
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parents:
diff changeset
213 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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parents:
diff changeset
214 {
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parents:
diff changeset
215 SDL_AudioDevice *this;
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parents:
diff changeset
216
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parents:
diff changeset
217 /* Initialize all variables that we clean on shutdown */
865
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parents: 769
diff changeset
218 LoadALSALibrary();
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1331
diff changeset
219 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0
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parents:
diff changeset
220 if ( this ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1331
diff changeset
221 SDL_memset(this, 0, (sizeof *this));
0
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parents:
diff changeset
222 this->hidden = (struct SDL_PrivateAudioData *)
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
223 SDL_malloc((sizeof *this->hidden));
0
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parents:
diff changeset
224 }
74212992fb08 Initial revision
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parents:
diff changeset
225 if ( (this == NULL) || (this->hidden == NULL) ) {
74212992fb08 Initial revision
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parents:
diff changeset
226 SDL_OutOfMemory();
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parents:
diff changeset
227 if ( this ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1331
diff changeset
228 SDL_free(this);
0
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parents:
diff changeset
229 }
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parents:
diff changeset
230 return(0);
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parents:
diff changeset
231 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1331
diff changeset
232 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
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parents:
diff changeset
233
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parents:
diff changeset
234 /* Set the function pointers */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
235 this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
236 this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
237 this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
238 this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
239 this->CloseAudio = ALSA_CloseAudio;
0
74212992fb08 Initial revision
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parents:
diff changeset
240
74212992fb08 Initial revision
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parents:
diff changeset
241 this->free = Audio_DeleteDevice;
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parents:
diff changeset
242
74212992fb08 Initial revision
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parents:
diff changeset
243 return this;
74212992fb08 Initial revision
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parents:
diff changeset
244 }
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parents:
diff changeset
245
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parents:
diff changeset
246 AudioBootStrap ALSA_bootstrap = {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
247 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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parents:
diff changeset
248 Audio_Available, Audio_CreateDevice
74212992fb08 Initial revision
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parents:
diff changeset
249 };
74212992fb08 Initial revision
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parents:
diff changeset
250
74212992fb08 Initial revision
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parents:
diff changeset
251 /* This function waits until it is possible to write a full sound buffer */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
252 static void ALSA_WaitAudio(_THIS)
0
74212992fb08 Initial revision
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parents:
diff changeset
253 {
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parents:
diff changeset
254 /* Check to see if the thread-parent process is still alive */
74212992fb08 Initial revision
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parents:
diff changeset
255 { static int cnt = 0;
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parents:
diff changeset
256 /* Note that this only works with thread implementations
74212992fb08 Initial revision
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parents:
diff changeset
257 that use a different process id for each thread.
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parents:
diff changeset
258 */
74212992fb08 Initial revision
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parents:
diff changeset
259 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
74212992fb08 Initial revision
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parents:
diff changeset
260 if ( kill(parent, 0) < 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
261 this->enabled = 0;
74212992fb08 Initial revision
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parents:
diff changeset
262 }
74212992fb08 Initial revision
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parents:
diff changeset
263 }
74212992fb08 Initial revision
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parents:
diff changeset
264 }
74212992fb08 Initial revision
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parents:
diff changeset
265 }
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266
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267
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268 /*
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269 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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270 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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271 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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272 */
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273 #define SWIZ6(T) \
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274 T *ptr = (T *) mixbuf; \
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275 const Uint32 count = (this->spec.samples / 6); \
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276 Uint32 i; \
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277 for (i = 0; i < count; i++, ptr += 6) { \
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278 T tmp; \
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279 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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280 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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281 }
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282
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283 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); }
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284 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); }
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285 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); }
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286 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); }
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287
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288 #undef SWIZ6
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289
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290
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291 /*
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292 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
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293 * from Windows/Mac order to the format alsalib will want.
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294 */
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295 static __inline__ void swizzle_alsa_channels(_THIS)
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296 {
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297 if (this->spec.channels == 6) {
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298 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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299 if (fmtsize == 16)
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300 swizzle_alsa_channels_6_16bit(this);
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301 else if (fmtsize == 8)
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302 swizzle_alsa_channels_6_8bit(this);
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303 else if (fmtsize == 32)
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304 swizzle_alsa_channels_6_32bit(this);
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305 else if (fmtsize == 64)
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306 swizzle_alsa_channels_6_64bit(this);
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307 }
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308
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309 /* !!! FIXME: update this for 7.1 if needed, later. */
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310 }
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311
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312
354
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313 static void ALSA_PlayAudio(_THIS)
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314 {
354
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315 int status;
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316 int sample_len;
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317 signed short *sample_buf;
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318
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319 swizzle_alsa_channels(this);
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320
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321 sample_len = this->spec.samples;
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322 sample_buf = (signed short *)mixbuf;
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323
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324 while ( sample_len > 0 ) {
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325 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
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326 if ( status < 0 ) {
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327 if ( status == -EAGAIN ) {
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328 SDL_Delay(1);
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329 continue;
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330 }
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331 if ( status == -ESTRPIPE ) {
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332 do {
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333 SDL_Delay(1);
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334 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
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335 } while ( status == -EAGAIN );
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336 }
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337 if ( status < 0 ) {
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338 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
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339 }
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340 if ( status < 0 ) {
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341 /* Hmm, not much we can do - abort */
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342 this->enabled = 0;
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343 return;
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344 }
356
a1e54d1ba16f *** empty log message ***
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345 continue;
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346 }
354
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347 sample_buf += status * this->spec.channels;
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348 sample_len -= status;
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349 }
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350 }
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351
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352 static Uint8 *ALSA_GetAudioBuf(_THIS)
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353 {
354
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354 return(mixbuf);
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355 }
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356
354
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357 static void ALSA_CloseAudio(_THIS)
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358 {
354
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359 if ( mixbuf != NULL ) {
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360 SDL_FreeAudioMem(mixbuf);
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361 mixbuf = NULL;
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362 }
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363 if ( pcm_handle ) {
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364 SDL_NAME(snd_pcm_drain)(pcm_handle);
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365 SDL_NAME(snd_pcm_close)(pcm_handle);
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366 pcm_handle = NULL;
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367 }
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368 }
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369
354
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370 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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371 {
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diff changeset
372 int status;
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373 snd_pcm_hw_params_t *hwparams;
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374 snd_pcm_sw_params_t *swparams;
354
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375 snd_pcm_format_t format;
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376 snd_pcm_uframes_t frames;
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377 Uint16 test_format;
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378
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379 /* Open the audio device */
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380 /* Name of device should depend on # channels in spec */
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381 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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diff changeset
382
354
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diff changeset
383 if ( status < 0 ) {
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384 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
385 return(-1);
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diff changeset
386 }
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diff changeset
387
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diff changeset
388 /* Figure out what the hardware is capable of */
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389 snd_pcm_hw_params_alloca(&hwparams);
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390 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams);
354
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diff changeset
391 if ( status < 0 ) {
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392 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
393 ALSA_CloseAudio(this);
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diff changeset
394 return(-1);
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diff changeset
395 }
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diff changeset
396
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diff changeset
397 /* SDL only uses interleaved sample output */
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diff changeset
398 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
399 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
400 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
401 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 /* Try for a closest match on audio format */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
406 status = -1;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 for ( test_format = SDL_FirstAudioFormat(spec->format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
408 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
409 switch ( test_format ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
411 format = SND_PCM_FORMAT_U8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
414 format = SND_PCM_FORMAT_S8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
417 format = SND_PCM_FORMAT_S16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
420 format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
423 format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
426 format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
429 format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
432 if ( format != 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
433 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
434 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
435 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
439 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 SDL_SetError("Couldn't find any hardware audio formats");
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
441 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
446 /* Set the number of channels */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
447 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
448 if ( status < 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
449 status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
450 if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
451 SDL_SetError("Couldn't set audio channels");
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
452 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
453 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
454 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
455 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
456 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
458 /* Set the audio rate */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
459 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, spec->freq, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
460 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
461 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
462 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
463 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
464 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
465 spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
467 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
468 frames = spec->samples;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
469 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, frames, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
470 spec->samples = frames;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
471 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
472
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
473 /* "set" the hardware with the desired parameters */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
474 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
475 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
476 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
477 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
478 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
479 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
480
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
481 /* This is useful for debugging... */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
482 /*
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
483 { snd_pcm_sframes_t bufsize; int fragments;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
484 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
485 fragments = SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
486
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
487 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
488 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
489 */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
490
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
491 /* Set the software parameters */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
492 snd_pcm_sw_params_alloca(&swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
493 status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
494 if ( status < 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
495 SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
496 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
497 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
498 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
499 status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 0);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
500 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
501 SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
502 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
503 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
504 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
505 status = SDL_NAME(snd_pcm_sw_params_set_avail_min)(pcm_handle, swparams, frames);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
506 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
507 SDL_SetError("Couldn't set avail min: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
508 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
509 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
510 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
511 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
512 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
513 SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
514 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
515 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
517
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
518 /* Calculate the final parameters for this audio specification */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
519 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
521 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
522 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
523 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
524 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
525 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
526 return(-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
528 SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
530 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
531 parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
532
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
533 /* Switch to blocking mode for playback */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
534 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
535
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
537 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 }