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annotate src/audio/alsa/SDL_alsa_audio.c @ 4159:a1b03ba2fcd0 SDL-1.2

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Updated copyright date
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:25:42 +0000
parents d7c9d7f42881
children 464126f4c7db
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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119 { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) },
b2462b772cce Fixed bug #79
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120 { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) },
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diff changeset
121 { "snd_pcm_sw_params_set_avail_min", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_avail_min) },
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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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125
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diff changeset
126 static void UnloadALSALibrary(void) {
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127 if (alsa_loaded) {
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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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135 static int LoadALSALibrary(void) {
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136 int i, retval = -1;
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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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141 alsa_loaded = 1;
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142 retval = 0;
1379
c0a74f199ecf Use only safe string functions
Sam Lantinga <slouken@libsdl.org>
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diff changeset
143 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
865
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144 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
1361
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145 #if HAVE_DLVSYM
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146 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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147 if (!*alsa_functions[i].func)
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148 #endif
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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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diff changeset
152 UnloadALSALibrary();
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diff changeset
153 break;
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diff changeset
154 }
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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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164 }
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165
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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 */
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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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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
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diff changeset
177 if ( device == NULL ) {
942
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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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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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184
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185 /* Audio driver bootstrap functions */
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186
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187 static int Audio_Available(void)
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188 {
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diff changeset
189 int available;
354
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diff changeset
190 int status;
0
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diff changeset
191 snd_pcm_t *handle;
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diff changeset
192
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193 available = 0;
865
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194 if (LoadALSALibrary() < 0) {
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diff changeset
195 return available;
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diff changeset
196 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
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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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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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diff changeset
217 /* Initialize all variables that we clean on shutdown */
865
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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.
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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) ) {
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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
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parents:
diff changeset
240
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parents:
diff changeset
241 this->free = Audio_DeleteDevice;
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parents:
diff changeset
242
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parents:
diff changeset
243 return this;
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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
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parents:
diff changeset
249 };
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parents:
diff changeset
250
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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
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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 */
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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;
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parents:
diff changeset
262 }
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parents:
diff changeset
263 }
74212992fb08 Initial revision
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parents:
diff changeset
264 }
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parents:
diff changeset
265 }
74212992fb08 Initial revision
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parents:
diff changeset
266
1878
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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
354
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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
354
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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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diff changeset
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 */
942
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diff changeset
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 }