Mercurial > sdl-ios-xcode

annotate src/audio/arts/SDL_artsaudio.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children b21348d47cab
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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #ifdef HAVE_SIGNAL_H
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27 #include <signal.h>
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28 #endif
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29 #include <unistd.h>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_audio.h"
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33 #include "../SDL_audiomem.h"
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34 #include "../SDL_audio_c.h"
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35 #include "SDL_artsaudio.h"
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36
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37 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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38 #include "SDL_name.h"
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39 #include "SDL_loadso.h"
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40 #else
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41 #define SDL_NAME(X) X
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42 #endif
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43
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44 /* The tag name used by artsc audio */
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45 #define ARTS_DRIVER_NAME "arts"
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46
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47 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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48
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49 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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50 static void *arts_handle = NULL;
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51
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52 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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53 static int (*SDL_NAME(arts_init)) (void);
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54 static void (*SDL_NAME(arts_free)) (void);
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55 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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56 int channels,
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57 const char *name);
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58 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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59 arts_parameter_t param, int value);
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60 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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61 arts_parameter_t param);
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62 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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63 int count);
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64 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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65 static int (*SDL_NAME(arts_suspended)) (void);
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66 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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67
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68 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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69 static struct
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70 {
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71 const char *name;
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72 void **func;
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73 } arts_functions[] = {
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74 /* *INDENT-OFF* */
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75 SDL_ARTS_SYM(arts_init),
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76 SDL_ARTS_SYM(arts_free),
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77 SDL_ARTS_SYM(arts_play_stream),
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78 SDL_ARTS_SYM(arts_stream_set),
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79 SDL_ARTS_SYM(arts_stream_get),
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80 SDL_ARTS_SYM(arts_write),
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81 SDL_ARTS_SYM(arts_close_stream),
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82 SDL_ARTS_SYM(arts_suspended),
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83 SDL_ARTS_SYM(arts_error_text),
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84 /* *INDENT-ON* */
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85 };
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86
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87 #undef SDL_ARTS_SYM
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88
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89 static void
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90 UnloadARTSLibrary()
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91 {
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92 if (arts_handle != NULL) {
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93 SDL_UnloadObject(arts_handle);
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94 arts_handle = NULL;
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95 }
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96 }
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97
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98 static int
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99 LoadARTSLibrary(void)
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100 {
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101 int i, retval = -1;
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102
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103 if (arts_handle == NULL) {
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104 arts_handle = SDL_LoadObject(arts_library);
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105 if (arts_handle != NULL) {
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106 retval = 0;
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107 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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108 *arts_functions[i].func =
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109 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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110 if (!*arts_functions[i].func) {
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111 retval = -1;
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112 UnloadARTSLibrary();
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113 break;
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114 }
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115 }
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116 }
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117 }
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118
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119 return retval;
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120 }
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121
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122 #else
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123
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124 static void
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125 UnloadARTSLibrary()
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126 {
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127 return;
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128 }
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129
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130 static int
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131 LoadARTSLibrary(void)
294
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132 {
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133 return 0;
294
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diff changeset
134 }
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diff changeset
135
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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136 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
294
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137
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138 /* This function waits until it is possible to write a full sound buffer */
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139 static void
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140 ARTS_WaitDevice(_THIS)
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141 {
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142 Sint32 ticks;
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143
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144 /* Check to see if the thread-parent process is still alive */
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145 {
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146 static int cnt = 0;
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147 /* Note that this only works with thread implementations
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148 that use a different process id for each thread.
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149 */
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150 /* Check every 10 loops */
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diff changeset
151 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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152 if (kill(this->hidden->parent, 0) < 0) {
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153 this->enabled = 0;
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154 }
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155 }
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156 }
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157
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158 /* Use timer for general audio synchronization */
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159 ticks =
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160 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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161 if (ticks > 0) {
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162 SDL_Delay(ticks);
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163 }
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164 }
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165
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166 static void
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167 ARTS_PlayDevice(_THIS)
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168 {
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169 /* Write the audio data */
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170 int written = SDL_NAME(arts_write) (this->hidden->stream,
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171 this->hidden->mixbuf,
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172 this->hidden->mixlen);
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173
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174 /* If timer synchronization is enabled, set the next write frame */
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175 if (this->hidden->frame_ticks) {
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176 this->hidden->next_frame += this->hidden->frame_ticks;
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177 }
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178
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179 /* If we couldn't write, assume fatal error for now */
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180 if (written < 0) {
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181 this->enabled = 0;
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182 }
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183 #ifdef DEBUG_AUDIO
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184 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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185 #endif
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186 }
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187
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188 static void
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189 ARTS_WaitDone(_THIS)
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190 {
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191 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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192 }
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193
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194
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diff changeset
195 static Uint8 *
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diff changeset
196 ARTS_GetDeviceBuf(_THIS)
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diff changeset
197 {
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diff changeset
198 return (this->hidden->mixbuf);
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199 }
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200
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diff changeset
201
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202 static void
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diff changeset
203 ARTS_CloseDevice(_THIS)
0
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204 {
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diff changeset
205 if (this->hidden != NULL) {
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diff changeset
206 if (this->hidden->mixbuf != NULL) {
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parents: 1982
diff changeset
207 SDL_FreeAudioMem(this->hidden->mixbuf);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
208 this->hidden->mixbuf = NULL;
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diff changeset
209 }
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
210 if (this->hidden->stream) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
211 SDL_NAME(arts_close_stream) (this->hidden->stream);
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parents: 1982
diff changeset
212 this->hidden->stream = 0;
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diff changeset
213 }
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
214 SDL_NAME(arts_free) ();
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parents: 1982
diff changeset
215 SDL_free(this->hidden);
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diff changeset
216 this->hidden = NULL;
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217 }
0
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218 }
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diff changeset
219
2049
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diff changeset
220
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diff changeset
221 static int
2049
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diff changeset
222 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
0
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diff changeset
223 {
2049
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diff changeset
224 int rc = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
225 int bits = 0, frag_spec = 0;
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diff changeset
226 SDL_AudioFormat test_format = 0, format = 0;
0
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227
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diff changeset
228 /* Initialize all variables that we clean on shutdown */
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diff changeset
229 this->hidden = (struct SDL_PrivateAudioData *)
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230 SDL_malloc((sizeof *this->hidden));
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diff changeset
231 if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
232 SDL_OutOfMemory();
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diff changeset
233 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
234 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
235 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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236
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diff changeset
237 /* Try for a closest match on audio format */
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diff changeset
238 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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239 !format && test_format;) {
0
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diff changeset
240 #ifdef DEBUG_AUDIO
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241 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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242 #endif
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diff changeset
243 switch (test_format) {
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244 case AUDIO_U8:
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245 bits = 8;
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diff changeset
246 format = 1;
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diff changeset
247 break;
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diff changeset
248 case AUDIO_S16LSB:
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diff changeset
249 bits = 16;
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diff changeset
250 format = 1;
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diff changeset
251 break;
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diff changeset
252 default:
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diff changeset
253 format = 0;
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diff changeset
254 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
256 if (!format) {
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diff changeset
257 test_format = SDL_NextAudioFormat();
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258 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
259 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
260 if (format == 0) {
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261 ARTS_CloseDevice(this);
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262 SDL_SetError("Couldn't find any hardware audio formats");
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263 return 0;
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264 }
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diff changeset
265 this->spec.format = test_format;
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266
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diff changeset
267 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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diff changeset
268 ARTS_CloseDevice(this);
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269 SDL_SetError("Unable to initialize ARTS: %s",
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270 SDL_NAME(arts_error_text) (rc));
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271 return 0;
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272 }
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273
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274 if (!SDL_NAME(arts_suspended) ()) {
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275 ARTS_CloseDevice(this);
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276 SDL_SetError("ARTS can not open audio device");
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277 return 0;
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278 }
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279
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280 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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diff changeset
281 bits,
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282 this->spec.channels,
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283 "SDL");
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284
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285 /* Play nothing so we have at least one write (server bug workaround). */
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286 SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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287
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288 /* Calculate the final parameters for this audio specification */
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289 SDL_CalculateAudioSpec(&this->spec);
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290
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291 /* Determine the power of two of the fragment size */
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diff changeset
292 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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diff changeset
293 if ((0x01 << frag_spec) != this->spec.size) {
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294 ARTS_CloseDevice(this);
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295 SDL_SetError("Fragment size must be a power of two");
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diff changeset
296 return 0;
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297 }
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298 frag_spec |= 0x00020000; /* two fragments, for low latency */
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299
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300 #ifdef ARTS_P_PACKET_SETTINGS
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diff changeset
301 SDL_NAME(arts_stream_set) (this->hidden->stream,
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302 ARTS_P_PACKET_SETTINGS, frag_spec);
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diff changeset
303 #else
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diff changeset
304 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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diff changeset
305 frag_spec & 0xffff);
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diff changeset
306 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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diff changeset
307 frag_spec >> 16);
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308 #endif
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diff changeset
309 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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diff changeset
310 ARTS_P_PACKET_SIZE);
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311
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diff changeset
312 /* Allocate mixing buffer */
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diff changeset
313 this->hidden->mixlen = this->spec.size;
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diff changeset
314 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
315 if (this->hidden->mixbuf == NULL) {
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diff changeset
316 ARTS_CloseDevice(this);
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diff changeset
317 SDL_OutOfMemory();
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diff changeset
318 return 0;
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319 }
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diff changeset
320 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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diff changeset
321
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322 /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
323 this->hidden->parent = getpid();
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324
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325 /* We're ready to rock and roll. :-) */
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diff changeset
326 return 1;
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diff changeset
327 }
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diff changeset
328
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diff changeset
329
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diff changeset
330 static void
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diff changeset
331 ARTS_Deinitialize(void)
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diff changeset
332 {
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diff changeset
333 UnloadARTSLibrary();
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diff changeset
334 }
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diff changeset
335
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diff changeset
336
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diff changeset
337 static int
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diff changeset
338 ARTS_Init(SDL_AudioDriverImpl * impl)
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diff changeset
339 {
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diff changeset
340 if (LoadARTSLibrary() < 0) {
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diff changeset
341 return 0;
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diff changeset
342 } else {
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diff changeset
343 if (SDL_NAME(arts_init) () != 0) {
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diff changeset
344 UnloadARTSLibrary();
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diff changeset
345 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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diff changeset
346 return 0;
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diff changeset
347 }
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diff changeset
348
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diff changeset
349 /* Play a stream so aRts doesn't crash */
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diff changeset
350 if (SDL_NAME(arts_suspended) ()) {
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diff changeset
351 arts_stream_t stream;
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diff changeset
352 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
353 SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
354 SDL_NAME(arts_close_stream) (stream);
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diff changeset
355 }
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diff changeset
356
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diff changeset
357 SDL_NAME(arts_free) ();
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diff changeset
358 }
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diff changeset
359
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diff changeset
360 /* Set the function pointers */
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diff changeset
361 impl->OpenDevice = ARTS_OpenDevice;
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diff changeset
362 impl->PlayDevice = ARTS_PlayDevice;
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diff changeset
363 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
364 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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diff changeset
365 impl->CloseDevice = ARTS_CloseDevice;
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diff changeset
366 impl->WaitDone = ARTS_WaitDone;
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diff changeset
367 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
368 impl->OnlyHasDefaultOutputDevice = 1;
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diff changeset
369
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diff changeset
370 return 1;
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diff changeset
371 }
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diff changeset
372
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diff changeset
373
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diff changeset
374 AudioBootStrap ARTS_bootstrap = {
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diff changeset
375 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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diff changeset
376 };
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diff changeset
377
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diff changeset
378 /* vi: set ts=4 sw=4 expandtab: */