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annotate src/audio/arts/SDL_artsaudio.c @ 2049:5f6550e5184f

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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:15:21 +0000
parents 3b4ce57c6215
children 866052b01ee5
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "../SDL_audiomem.h"
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29 #include "../SDL_audio_c.h"
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30 #include "SDL_artsaudio.h"
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31
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32 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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33 #include "SDL_name.h"
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34 #include "SDL_loadso.h"
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35 #else
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36 #define SDL_NAME(X) X
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37 #endif
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38
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39 /* The tag name used by artsc audio */
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40 #define ARTS_DRIVER_NAME "arts"
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41
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42 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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43
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44 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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45 static void *arts_handle = NULL;
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46
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47 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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48 static int (*SDL_NAME(arts_init)) (void);
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49 static void (*SDL_NAME(arts_free)) (void);
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50 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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51 int channels,
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52 const char *name);
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53 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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54 arts_parameter_t param, int value);
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55 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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56 arts_parameter_t param);
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57 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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58 int count);
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59 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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60 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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61 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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62
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63 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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64 static struct
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65 {
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66 const char *name;
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67 void **func;
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68 } arts_functions[] = {
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69 SDL_ARTS_SYM(arts_init),
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70 SDL_ARTS_SYM(arts_free),
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71 SDL_ARTS_SYM(arts_play_stream),
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72 SDL_ARTS_SYM(arts_stream_set),
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73 SDL_ARTS_SYM(arts_stream_get),
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74 SDL_ARTS_SYM(arts_write),
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75 SDL_ARTS_SYM(arts_close_stream),
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76 SDL_ARTS_SYM(arts_error_text),
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77 };
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78 #undef SDL_ARTS_SYM
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79
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80 static void
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81 UnloadARTSLibrary()
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82 {
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83 if (arts_handle != NULL) {
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84 SDL_UnloadObject(arts_handle);
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85 arts_handle = NULL;
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86 }
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87 }
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88
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89 static int
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90 LoadARTSLibrary(void)
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91 {
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92 int i, retval = -1;
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93
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94 if (arts_handle == NULL) {
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95 arts_handle = SDL_LoadObject(arts_library);
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96 if (arts_handle != NULL) {
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97 retval = 0;
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98 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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99 *arts_functions[i].func =
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100 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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101 if (!*arts_functions[i].func) {
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102 retval = -1;
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103 UnloadARTSLibrary();
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104 break;
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105 }
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106 }
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107 }
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108 }
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109
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110 return retval;
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111 }
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112
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113 #else
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114
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115 static void
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116 UnloadARTSLibrary()
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117 {
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118 return;
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119 }
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120
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121 static int
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122 LoadARTSLibrary(void)
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123 {
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124 return 0;
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125 }
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126
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127 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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128
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129 /* This function waits until it is possible to write a full sound buffer */
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130 static void
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131 ARTS_WaitDevice(_THIS)
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132 {
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133 Sint32 ticks;
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134
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135 /* Check to see if the thread-parent process is still alive */
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136 {
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diff changeset
137 static int cnt = 0;
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138 /* Note that this only works with thread implementations
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139 that use a different process id for each thread.
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140 */
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141 /* Check every 10 loops */
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diff changeset
142 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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diff changeset
143 if (kill(this->hidden->parent, 0) < 0) {
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144 this->enabled = 0;
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145 }
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146 }
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147 }
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148
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149 /* Use timer for general audio synchronization */
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diff changeset
150 ticks = ((Sint32) (this->hidden->next_frame-SDL_GetTicks())) - FUDGE_TICKS;
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151 if (ticks > 0) {
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152 SDL_Delay(ticks);
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153 }
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154 }
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155
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156 static void
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157 ARTS_PlayDevice(_THIS)
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158 {
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159 /* Write the audio data */
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diff changeset
160 int written = SDL_NAME(arts_write) (
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diff changeset
161 this->hidden->stream,
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diff changeset
162 this->hidden->mixbuf,
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diff changeset
163 this->hidden->mixlen);
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164
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165 /* If timer synchronization is enabled, set the next write frame */
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diff changeset
166 if (this->hidden->frame_ticks) {
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diff changeset
167 this->hidden->next_frame += this->hidden->frame_ticks;
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168 }
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169
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170 /* If we couldn't write, assume fatal error for now */
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171 if (written < 0) {
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172 this->enabled = 0;
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173 }
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174 #ifdef DEBUG_AUDIO
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175 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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176 #endif
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177 }
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178
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179 static void
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180 ARTS_WaitDone(_THIS)
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181 {
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diff changeset
182 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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183 }
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184
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185
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diff changeset
186 static Uint8 *
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diff changeset
187 ARTS_GetDeviceBuf(_THIS)
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diff changeset
188 {
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diff changeset
189 return (this->hidden->mixbuf);
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diff changeset
190 }
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191
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diff changeset
192
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193 static void
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194 ARTS_CloseDevice(_THIS)
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195 {
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196 if (this->hidden != NULL) {
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diff changeset
197 if (this->hidden->mixbuf != NULL) {
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diff changeset
198 SDL_FreeAudioMem(this->hidden->mixbuf);
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diff changeset
199 this->hidden->mixbuf = NULL;
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diff changeset
200 }
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diff changeset
201 if (this->hidden->stream) {
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diff changeset
202 SDL_NAME(arts_close_stream) (this->hidden->stream);
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diff changeset
203 this->hidden->stream = 0;
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diff changeset
204 }
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
205 SDL_NAME(arts_free) ();
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diff changeset
206 SDL_free(this->hidden);
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diff changeset
207 this->hidden = NULL;
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208 }
0
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209 }
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diff changeset
210
2049
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diff changeset
211
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diff changeset
212 static int
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diff changeset
213 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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diff changeset
214 {
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parents: 1982
diff changeset
215 int rc = 0;
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parents: 1982
diff changeset
216 int bits = 0, frag_spec = 0;
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diff changeset
217 SDL_AudioFormat test_format = 0, format = 0;
0
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218
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diff changeset
219 /* Initialize all variables that we clean on shutdown */
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diff changeset
220 this->hidden = (struct SDL_PrivateAudioData *)
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parents: 1982
diff changeset
221 SDL_malloc((sizeof *this->hidden));
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parents: 1982
diff changeset
222 if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
223 SDL_OutOfMemory();
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diff changeset
224 return 0;
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diff changeset
225 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
226 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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227
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228 /* Try for a closest match on audio format */
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diff changeset
229 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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230 !format && test_format;) {
0
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diff changeset
231 #ifdef DEBUG_AUDIO
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232 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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233 #endif
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234 switch (test_format) {
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235 case AUDIO_U8:
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236 bits = 8;
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diff changeset
237 format = 1;
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diff changeset
238 break;
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diff changeset
239 case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 bits = 16;
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diff changeset
241 format = 1;
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diff changeset
242 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
243 default:
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diff changeset
244 format = 0;
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diff changeset
245 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
246 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
247 if (!format) {
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diff changeset
248 test_format = SDL_NextAudioFormat();
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249 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
251 if (format == 0) {
2049
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diff changeset
252 ARTS_CloseDevice(this);
1895
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diff changeset
253 SDL_SetError("Couldn't find any hardware audio formats");
2049
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diff changeset
254 return 0;
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diff changeset
255 }
2049
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parents: 1982
diff changeset
256 this->spec.format = test_format;
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257
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258 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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259 ARTS_CloseDevice(this);
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260 SDL_SetError( "Unable to initialize ARTS: %s",
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diff changeset
261 SDL_NAME(arts_error_text)(rc) );
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262 return 0;
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263 }
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264 this->hidden->stream = SDL_NAME(arts_play_stream) (
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265 this->spec.freq,
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266 bits, this->spec.channels,
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267 "SDL");
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268
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269 /* Calculate the final parameters for this audio specification */
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270 SDL_CalculateAudioSpec(&this->spec);
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271
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272 /* Determine the power of two of the fragment size */
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273 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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274 if ((0x01 << frag_spec) != this->spec.size) {
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275 ARTS_CloseDevice(this);
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276 SDL_SetError("Fragment size must be a power of two");
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277 return 0;
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278 }
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279 frag_spec |= 0x00020000; /* two fragments, for low latency */
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280
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281 #ifdef ARTS_P_PACKET_SETTINGS
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282 SDL_NAME(arts_stream_set) (this->hidden->stream,
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283 ARTS_P_PACKET_SETTINGS, frag_spec);
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284 #else
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285 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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286 frag_spec & 0xffff);
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287 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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288 frag_spec >> 16);
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289 #endif
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290 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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291 ARTS_P_PACKET_SIZE);
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292
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293 /* Allocate mixing buffer */
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294 this->hidden->mixlen = this->spec.size;
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295 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
296 if (this->hidden->mixbuf == NULL) {
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297 ARTS_CloseDevice(this);
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298 SDL_OutOfMemory();
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299 return 0;
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300 }
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diff changeset
301 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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302
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303 /* Get the parent process id (we're the parent of the audio thread) */
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304 this->hidden->parent = getpid();
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305
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306 /* We're ready to rock and roll. :-) */
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307 return 1;
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308 }
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309
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310
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diff changeset
311 static void
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diff changeset
312 ARTS_Deinitialize(void)
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313 {
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314 UnloadARTSLibrary();
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315 }
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316
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317
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318 static int
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diff changeset
319 ARTS_Init(SDL_AudioDriverImpl *impl)
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320 {
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diff changeset
321 if (LoadARTSLibrary() < 0) {
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322 return 0;
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323 } else {
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diff changeset
324 if (SDL_NAME(arts_init) () != 0) {
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325 UnloadARTSLibrary();
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326 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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327 return 0;
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328 }
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diff changeset
329
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diff changeset
330 /* Play a stream so aRts doesn't crash */
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diff changeset
331 arts_stream_t stream;
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diff changeset
332 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
333 SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
334 SDL_NAME(arts_close_stream) (stream);
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diff changeset
335 SDL_NAME(arts_free) ();
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diff changeset
336 }
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diff changeset
337
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diff changeset
338 /* Set the function pointers */
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diff changeset
339 impl->OpenDevice = ARTS_OpenDevice;
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diff changeset
340 impl->PlayDevice = ARTS_PlayDevice;
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diff changeset
341 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
342 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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343 impl->CloseDevice = ARTS_CloseDevice;
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diff changeset
344 impl->WaitDone = ARTS_WaitDone;
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diff changeset
345 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
346 impl->OnlyHasDefaultOutputDevice = 1;
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347
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348 return 1;
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diff changeset
349 }
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350
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351
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diff changeset
352 AudioBootStrap ARTS_bootstrap = {
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diff changeset
353 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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diff changeset
354 };
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355
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356 /* vi: set ts=4 sw=4 expandtab: */