annotate src/audio/arts/SDL_artsaudio.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents c9b51268668f
children 604d73db6802
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
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include <sys/types.h>
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26 #include <stdlib.h>
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27 #include <stdio.h>
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28 #include <string.h>
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29 #include <errno.h>
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30 #include <signal.h>
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31 #include <unistd.h>
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32
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33 #include "SDL_audio.h"
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34 #include "SDL_error.h"
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35 #include "SDL_audiomem.h"
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36 #include "SDL_audio_c.h"
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37 #include "SDL_timer.h"
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38 #include "SDL_audiodev_c.h"
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39 #include "SDL_artsaudio.h"
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40
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41 #ifdef ARTSC_DYNAMIC
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42 #include "SDL_name.h"
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43 #include "SDL_loadso.h"
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44 #else
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45 #define SDL_NAME(X) X
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46 #endif
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47
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48 /* The tag name used by artsc audio */
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49 #define ARTSC_DRIVER_NAME "arts"
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50
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51 /* Audio driver functions */
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52 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec);
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53 static void ARTSC_WaitAudio(_THIS);
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54 static void ARTSC_PlayAudio(_THIS);
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55 static Uint8 *ARTSC_GetAudioBuf(_THIS);
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56 static void ARTSC_CloseAudio(_THIS);
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57
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58 #ifdef ARTSC_DYNAMIC
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59
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60 static const char *arts_library = ARTSC_DYNAMIC;
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61 static void *arts_handle = NULL;
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62 static int arts_loaded = 0;
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63
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64 static int (*SDL_NAME(arts_init))(void);
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65 static void (*SDL_NAME(arts_free))(void);
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66 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name);
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67 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value);
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68 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param);
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69 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count);
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70 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s);
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71
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72 static struct {
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73 const char *name;
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74 void **func;
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75 } arts_functions[] = {
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76 { "arts_init", (void **)&SDL_NAME(arts_init) },
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77 { "arts_free", (void **)&SDL_NAME(arts_free) },
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78 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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79 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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80 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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81 { "arts_write", (void **)&SDL_NAME(arts_write) },
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82 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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83 };
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84
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85 static void UnloadARTSLibrary()
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86 {
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87 if ( arts_loaded ) {
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88 SDL_UnloadObject(arts_handle);
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89 arts_handle = NULL;
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90 arts_loaded = 0;
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91 }
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92 }
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93
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94 static int LoadARTSLibrary(void)
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95 {
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96 int i, retval = -1;
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97
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98 arts_handle = SDL_LoadObject(arts_library);
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99 if ( arts_handle ) {
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100 arts_loaded = 1;
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101 retval = 0;
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102 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) {
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103 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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104 if ( !*arts_functions[i].func ) {
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105 retval = -1;
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106 UnloadARTSLibrary();
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107 break;
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108 }
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109 }
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110 }
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111 return retval;
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112 }
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113
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114 #else
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115
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116 static void 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 LoadARTSLibrary(void)
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122 {
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123 return 0;
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124 }
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125
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126 #endif /* ARTSC_DYNAMIC */
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127
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128 /* Audio driver bootstrap functions */
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129
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130 static int Audio_Available(void)
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131 {
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132 int available = 0;
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133
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134 if ( LoadARTSLibrary() < 0 ) {
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135 return available;
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136 }
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137 if ( SDL_NAME(arts_init)() == 0 ) {
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138 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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139 #ifdef ARTS_CRASH_HACK
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140 arts_stream_t stream2;
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141 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL");
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142 SDL_NAME(arts_write)(stream2, "", 0);
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143 SDL_NAME(arts_close_stream)(stream2);
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144 #endif
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145 available = 1;
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146 SDL_NAME(arts_free)();
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147 }
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148 UnloadARTSLibrary();
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149
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150 return available;
0
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151 }
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152
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153 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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154 {
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155 SDL_free(device->hidden);
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156 SDL_free(device);
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157 UnloadARTSLibrary();
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158 }
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159
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160 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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161 {
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162 SDL_AudioDevice *this;
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163
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164 /* Initialize all variables that we clean on shutdown */
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165 LoadARTSLibrary();
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166 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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167 if ( this ) {
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168 SDL_memset(this, 0, (sizeof *this));
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169 this->hidden = (struct SDL_PrivateAudioData *)
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170 SDL_malloc((sizeof *this->hidden));
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171 }
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172 if ( (this == NULL) || (this->hidden == NULL) ) {
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173 SDL_OutOfMemory();
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174 if ( this ) {
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175 SDL_free(this);
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176 }
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177 return(0);
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178 }
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179 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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180 stream = 0;
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181
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182 /* Set the function pointers */
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183 this->OpenAudio = ARTSC_OpenAudio;
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184 this->WaitAudio = ARTSC_WaitAudio;
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185 this->PlayAudio = ARTSC_PlayAudio;
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186 this->GetAudioBuf = ARTSC_GetAudioBuf;
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187 this->CloseAudio = ARTSC_CloseAudio;
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188
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189 this->free = Audio_DeleteDevice;
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190
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191 return this;
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192 }
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193
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194 AudioBootStrap ARTSC_bootstrap = {
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195 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer",
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196 Audio_Available, Audio_CreateDevice
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197 };
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198
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199 /* This function waits until it is possible to write a full sound buffer */
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200 static void ARTSC_WaitAudio(_THIS)
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201 {
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202 Sint32 ticks;
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203
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204 /* Check to see if the thread-parent process is still alive */
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205 { static int cnt = 0;
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206 /* Note that this only works with thread implementations
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207 that use a different process id for each thread.
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208 */
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209 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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210 if ( kill(parent, 0) < 0 ) {
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211 this->enabled = 0;
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212 }
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213 }
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214 }
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215
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216 /* Use timer for general audio synchronization */
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217 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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218 if ( ticks > 0 ) {
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219 SDL_Delay(ticks);
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220 }
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221 }
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222
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223 static void ARTSC_PlayAudio(_THIS)
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224 {
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225 int written;
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226
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227 /* Write the audio data */
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228 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
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229
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230 /* If timer synchronization is enabled, set the next write frame */
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231 if ( frame_ticks ) {
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232 next_frame += frame_ticks;
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233 }
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234
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235 /* If we couldn't write, assume fatal error for now */
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236 if ( written < 0 ) {
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237 this->enabled = 0;
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238 }
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239 #ifdef DEBUG_AUDIO
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240 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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241 #endif
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242 }
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243
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244 static Uint8 *ARTSC_GetAudioBuf(_THIS)
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245 {
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246 return(mixbuf);
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247 }
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248
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249 static void ARTSC_CloseAudio(_THIS)
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250 {
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251 if ( mixbuf != NULL ) {
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252 SDL_FreeAudioMem(mixbuf);
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253 mixbuf = NULL;
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254 }
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255 if ( stream ) {
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256 SDL_NAME(arts_close_stream)(stream);
0
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257 stream = 0;
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258 }
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259 SDL_NAME(arts_free)();
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260 }
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261
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262 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec)
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263 {
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264 int bits, frag_spec;
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265 Uint16 test_format, format;
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266
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267 /* Reset the timer synchronization flag */
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268 frame_ticks = 0.0;
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269
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270 mixbuf = NULL;
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271
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272 /* Try for a closest match on audio format */
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273 format = 0;
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274 bits = 0;
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275 for ( test_format = SDL_FirstAudioFormat(spec->format);
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276 ! format && test_format; ) {
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277 #ifdef DEBUG_AUDIO
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278 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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279 #endif
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280 switch ( test_format ) {
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281 case AUDIO_U8:
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282 bits = 8;
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283 format = 1;
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284 break;
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285 case AUDIO_S16LSB:
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286 bits = 16;
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287 format = 1;
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288 break;
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289 default:
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290 format = 0;
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291 break;
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292 }
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293 if ( ! format ) {
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294 test_format = SDL_NextAudioFormat();
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295 }
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296 }
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297 if ( format == 0 ) {
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298 SDL_SetError("Couldn't find any hardware audio formats");
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299 return(-1);
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300 }
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301 spec->format = test_format;
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302
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303 if ( SDL_NAME(arts_init)() != 0 ) {
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304 SDL_SetError("Unable to initialize ARTS");
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305 return(-1);
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306 }
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307 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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308
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309 /* Calculate the final parameters for this audio specification */
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310 SDL_CalculateAudioSpec(spec);
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311
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312 /* Determine the power of two of the fragment size */
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313 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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314 if ( (0x01<<frag_spec) != spec->size ) {
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315 SDL_SetError("Fragment size must be a power of two");
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316 return(-1);
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317 }
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318 frag_spec |= 0x00020000; /* two fragments, for low latency */
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319
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320 #ifdef ARTS_P_PACKET_SETTINGS
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321 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
0
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322 #else
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323 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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324 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
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325 #endif
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326 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
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327
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328 /* Allocate mixing buffer */
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329 mixlen = spec->size;
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330 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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331 if ( mixbuf == NULL ) {
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332 return(-1);
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333 }
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334 SDL_memset(mixbuf, spec->silence, spec->size);
0
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335
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336 /* Get the parent process id (we're the parent of the audio thread) */
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337 parent = getpid();
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338
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339 /* We're ready to rock and roll. :-) */
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340 return(0);
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341 }