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annotate src/audio/arts/SDL_artsaudio.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children c0a74f199ecf
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 "SDL_timer.h"
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26 #include "SDL_audio.h"
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27 #include "../SDL_audiomem.h"
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28 #include "../SDL_audio_c.h"
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29 #include "../SDL_audiodev_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 /* Audio driver functions */
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43 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec);
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44 static void ARTS_WaitAudio(_THIS);
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45 static void ARTS_PlayAudio(_THIS);
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46 static Uint8 *ARTS_GetAudioBuf(_THIS);
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47 static void ARTS_CloseAudio(_THIS);
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48
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49 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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50
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51 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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52 static void *arts_handle = NULL;
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53 static int arts_loaded = 0;
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54
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55 static int (*SDL_NAME(arts_init))(void);
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56 static void (*SDL_NAME(arts_free))(void);
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57 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name);
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58 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value);
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59 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param);
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60 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count);
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61 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s);
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62
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63 static struct {
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64 const char *name;
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65 void **func;
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66 } arts_functions[] = {
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67 { "arts_init", (void **)&SDL_NAME(arts_init) },
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68 { "arts_free", (void **)&SDL_NAME(arts_free) },
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69 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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70 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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71 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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72 { "arts_write", (void **)&SDL_NAME(arts_write) },
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73 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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74 };
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75
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76 static void UnloadARTSLibrary()
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77 {
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78 if ( arts_loaded ) {
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79 SDL_UnloadObject(arts_handle);
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80 arts_handle = NULL;
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81 arts_loaded = 0;
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82 }
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83 }
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84
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85 static int LoadARTSLibrary(void)
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86 {
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87 int i, retval = -1;
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88
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89 arts_handle = SDL_LoadObject(arts_library);
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90 if ( arts_handle ) {
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91 arts_loaded = 1;
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92 retval = 0;
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93 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) {
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94 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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95 if ( !*arts_functions[i].func ) {
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96 retval = -1;
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97 UnloadARTSLibrary();
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98 break;
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99 }
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100 }
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101 }
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102 return retval;
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103 }
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104
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105 #else
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106
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107 static void UnloadARTSLibrary()
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108 {
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109 return;
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110 }
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111
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112 static int LoadARTSLibrary(void)
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113 {
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114 return 0;
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115 }
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116
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117 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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118
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119 /* Audio driver bootstrap functions */
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120
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121 static int Audio_Available(void)
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122 {
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123 int available = 0;
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124
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125 if ( LoadARTSLibrary() < 0 ) {
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126 return available;
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127 }
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128 if ( SDL_NAME(arts_init)() == 0 ) {
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129 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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130 #ifdef ARTS_CRASH_HACK
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131 arts_stream_t stream2;
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132 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL");
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133 SDL_NAME(arts_write)(stream2, "", 0);
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134 SDL_NAME(arts_close_stream)(stream2);
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135 #endif
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136 available = 1;
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137 SDL_NAME(arts_free)();
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138 }
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139 UnloadARTSLibrary();
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140
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141 return available;
0
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142 }
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143
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144 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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145 {
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146 SDL_free(device->hidden);
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147 SDL_free(device);
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148 UnloadARTSLibrary();
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149 }
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150
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151 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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152 {
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153 SDL_AudioDevice *this;
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154
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155 /* Initialize all variables that we clean on shutdown */
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156 LoadARTSLibrary();
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157 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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158 if ( this ) {
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159 SDL_memset(this, 0, (sizeof *this));
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160 this->hidden = (struct SDL_PrivateAudioData *)
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161 SDL_malloc((sizeof *this->hidden));
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162 }
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163 if ( (this == NULL) || (this->hidden == NULL) ) {
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164 SDL_OutOfMemory();
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165 if ( this ) {
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166 SDL_free(this);
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167 }
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168 return(0);
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169 }
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170 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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171 stream = 0;
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172
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173 /* Set the function pointers */
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174 this->OpenAudio = ARTS_OpenAudio;
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175 this->WaitAudio = ARTS_WaitAudio;
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176 this->PlayAudio = ARTS_PlayAudio;
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177 this->GetAudioBuf = ARTS_GetAudioBuf;
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178 this->CloseAudio = ARTS_CloseAudio;
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179
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180 this->free = Audio_DeleteDevice;
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181
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182 return this;
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183 }
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184
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185 AudioBootStrap ARTS_bootstrap = {
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186 ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
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187 Audio_Available, Audio_CreateDevice
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188 };
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189
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190 /* This function waits until it is possible to write a full sound buffer */
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191 static void ARTS_WaitAudio(_THIS)
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192 {
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193 Sint32 ticks;
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194
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195 /* Check to see if the thread-parent process is still alive */
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196 { static int cnt = 0;
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197 /* Note that this only works with thread implementations
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198 that use a different process id for each thread.
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199 */
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200 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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201 if ( kill(parent, 0) < 0 ) {
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202 this->enabled = 0;
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203 }
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204 }
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205 }
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206
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207 /* Use timer for general audio synchronization */
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208 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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209 if ( ticks > 0 ) {
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210 SDL_Delay(ticks);
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211 }
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212 }
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213
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214 static void ARTS_PlayAudio(_THIS)
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215 {
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216 int written;
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217
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218 /* Write the audio data */
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219 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
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220
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221 /* If timer synchronization is enabled, set the next write frame */
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222 if ( frame_ticks ) {
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223 next_frame += frame_ticks;
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224 }
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225
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226 /* If we couldn't write, assume fatal error for now */
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227 if ( written < 0 ) {
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228 this->enabled = 0;
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229 }
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230 #ifdef DEBUG_AUDIO
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231 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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232 #endif
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233 }
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234
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235 static Uint8 *ARTS_GetAudioBuf(_THIS)
0
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236 {
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237 return(mixbuf);
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238 }
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239
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240 static void ARTS_CloseAudio(_THIS)
0
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241 {
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242 if ( mixbuf != NULL ) {
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243 SDL_FreeAudioMem(mixbuf);
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244 mixbuf = NULL;
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245 }
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246 if ( stream ) {
294
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247 SDL_NAME(arts_close_stream)(stream);
0
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248 stream = 0;
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249 }
294
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250 SDL_NAME(arts_free)();
0
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251 }
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252
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253 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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254 {
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255 int bits, frag_spec;
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256 Uint16 test_format, format;
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257
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258 /* Reset the timer synchronization flag */
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259 frame_ticks = 0.0;
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260
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261 mixbuf = NULL;
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262
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263 /* Try for a closest match on audio format */
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264 format = 0;
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265 bits = 0;
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266 for ( test_format = SDL_FirstAudioFormat(spec->format);
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267 ! format && test_format; ) {
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268 #ifdef DEBUG_AUDIO
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269 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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270 #endif
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271 switch ( test_format ) {
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272 case AUDIO_U8:
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273 bits = 8;
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274 format = 1;
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275 break;
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276 case AUDIO_S16LSB:
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277 bits = 16;
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278 format = 1;
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279 break;
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280 default:
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281 format = 0;
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282 break;
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283 }
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284 if ( ! format ) {
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285 test_format = SDL_NextAudioFormat();
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286 }
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287 }
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288 if ( format == 0 ) {
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289 SDL_SetError("Couldn't find any hardware audio formats");
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290 return(-1);
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291 }
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292 spec->format = test_format;
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293
294
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294 if ( SDL_NAME(arts_init)() != 0 ) {
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295 SDL_SetError("Unable to initialize ARTS");
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296 return(-1);
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297 }
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298 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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299
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300 /* Calculate the final parameters for this audio specification */
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301 SDL_CalculateAudioSpec(spec);
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302
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303 /* Determine the power of two of the fragment size */
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304 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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305 if ( (0x01<<frag_spec) != spec->size ) {
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306 SDL_SetError("Fragment size must be a power of two");
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307 return(-1);
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308 }
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309 frag_spec |= 0x00020000; /* two fragments, for low latency */
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310
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311 #ifdef ARTS_P_PACKET_SETTINGS
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312 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
0
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313 #else
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314 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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315 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
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316 #endif
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317 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
0
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318
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319 /* Allocate mixing buffer */
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320 mixlen = spec->size;
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321 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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322 if ( mixbuf == NULL ) {
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323 return(-1);
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324 }
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325 SDL_memset(mixbuf, spec->silence, spec->size);
0
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326
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327 /* Get the parent process id (we're the parent of the audio thread) */
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328 parent = getpid();
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329
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330 /* We're ready to rock and roll. :-) */
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331 return(0);
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332 }