Mercurial > sdl-ios-xcode

annotate src/audio/arts/SDL_artsaudio.c @ 3950:9d9e15ab1697 SDL-1.2

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Check if yasm supports a nasm-specific syntax we use (it doesn't in 0.5.0, which is still common in Linux distros, and does in 0.6.0). Disable it if we don't, attempting to fallback to using nasm. Thanks to Mike Frysinger for the patch. Fixes Bugzilla #393.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 04 Jun 2007 11:06:48 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb 33c248ea75f9
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_audiodev_c.h"
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31 #include "SDL_artsaudio.h"
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32
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33 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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34 #include "SDL_name.h"
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35 #include "SDL_loadso.h"
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36 #else
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37 #define SDL_NAME(X) X
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38 #endif
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39
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40 /* The tag name used by artsc audio */
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41 #define ARTS_DRIVER_NAME "arts"
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42
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43 /* Audio driver functions */
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44 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec);
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45 static void ARTS_WaitAudio(_THIS);
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46 static void ARTS_PlayAudio(_THIS);
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47 static Uint8 *ARTS_GetAudioBuf(_THIS);
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48 static void ARTS_CloseAudio(_THIS);
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49
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50 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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51
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52 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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53 static void *arts_handle = NULL;
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54 static int arts_loaded = 0;
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55
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56 static int (*SDL_NAME(arts_init))(void);
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57 static void (*SDL_NAME(arts_free))(void);
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58 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name);
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59 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value);
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60 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param);
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61 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count);
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62 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s);
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63
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64 static struct {
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65 const char *name;
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66 void **func;
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67 } arts_functions[] = {
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68 { "arts_init", (void **)&SDL_NAME(arts_init) },
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69 { "arts_free", (void **)&SDL_NAME(arts_free) },
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70 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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71 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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72 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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73 { "arts_write", (void **)&SDL_NAME(arts_write) },
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74 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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75 };
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76
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77 static void UnloadARTSLibrary()
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78 {
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79 if ( arts_loaded ) {
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80 SDL_UnloadObject(arts_handle);
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81 arts_handle = NULL;
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82 arts_loaded = 0;
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83 }
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84 }
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85
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86 static int LoadARTSLibrary(void)
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87 {
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88 int i, retval = -1;
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89
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90 arts_handle = SDL_LoadObject(arts_library);
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91 if ( arts_handle ) {
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92 arts_loaded = 1;
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93 retval = 0;
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94 for ( i=0; i<SDL_arraysize(arts_functions); ++i ) {
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95 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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96 if ( !*arts_functions[i].func ) {
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97 retval = -1;
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98 UnloadARTSLibrary();
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99 break;
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100 }
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101 }
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102 }
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103 return retval;
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104 }
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105
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106 #else
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107
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108 static void UnloadARTSLibrary()
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109 {
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110 return;
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111 }
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112
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113 static int LoadARTSLibrary(void)
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114 {
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115 return 0;
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116 }
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117
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118 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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119
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120 /* Audio driver bootstrap functions */
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121
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122 static int Audio_Available(void)
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123 {
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124 int available = 0;
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125
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126 if ( LoadARTSLibrary() < 0 ) {
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127 return available;
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128 }
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129 if ( SDL_NAME(arts_init)() == 0 ) {
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130 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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131 #ifdef ARTS_CRASH_HACK
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132 arts_stream_t stream2;
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133 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL");
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134 SDL_NAME(arts_write)(stream2, "", 0);
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135 SDL_NAME(arts_close_stream)(stream2);
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136 #endif
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137 available = 1;
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138 SDL_NAME(arts_free)();
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139 }
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140 UnloadARTSLibrary();
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141
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142 return available;
0
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143 }
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144
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145 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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146 {
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147 SDL_free(device->hidden);
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148 SDL_free(device);
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149 UnloadARTSLibrary();
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150 }
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151
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152 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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153 {
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154 SDL_AudioDevice *this;
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155
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156 /* Initialize all variables that we clean on shutdown */
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157 LoadARTSLibrary();
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158 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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159 if ( this ) {
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160 SDL_memset(this, 0, (sizeof *this));
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161 this->hidden = (struct SDL_PrivateAudioData *)
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162 SDL_malloc((sizeof *this->hidden));
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163 }
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164 if ( (this == NULL) || (this->hidden == NULL) ) {
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165 SDL_OutOfMemory();
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166 if ( this ) {
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167 SDL_free(this);
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168 }
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169 return(0);
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170 }
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171 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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172 stream = 0;
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173
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174 /* Set the function pointers */
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175 this->OpenAudio = ARTS_OpenAudio;
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176 this->WaitAudio = ARTS_WaitAudio;
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177 this->PlayAudio = ARTS_PlayAudio;
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178 this->GetAudioBuf = ARTS_GetAudioBuf;
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179 this->CloseAudio = ARTS_CloseAudio;
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180
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181 this->free = Audio_DeleteDevice;
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182
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183 return this;
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184 }
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185
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186 AudioBootStrap ARTS_bootstrap = {
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187 ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
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188 Audio_Available, Audio_CreateDevice
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189 };
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190
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191 /* This function waits until it is possible to write a full sound buffer */
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192 static void ARTS_WaitAudio(_THIS)
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193 {
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194 Sint32 ticks;
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195
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196 /* Check to see if the thread-parent process is still alive */
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197 { static int cnt = 0;
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198 /* Note that this only works with thread implementations
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199 that use a different process id for each thread.
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200 */
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201 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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202 if ( kill(parent, 0) < 0 ) {
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203 this->enabled = 0;
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204 }
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205 }
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206 }
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207
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208 /* Use timer for general audio synchronization */
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209 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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210 if ( ticks > 0 ) {
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211 SDL_Delay(ticks);
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212 }
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213 }
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214
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215 static void ARTS_PlayAudio(_THIS)
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216 {
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217 int written;
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218
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219 /* Write the audio data */
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220 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
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221
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222 /* If timer synchronization is enabled, set the next write frame */
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223 if ( frame_ticks ) {
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224 next_frame += frame_ticks;
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225 }
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226
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227 /* If we couldn't write, assume fatal error for now */
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228 if ( written < 0 ) {
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229 this->enabled = 0;
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230 }
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231 #ifdef DEBUG_AUDIO
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232 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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233 #endif
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234 }
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235
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236 static Uint8 *ARTS_GetAudioBuf(_THIS)
0
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237 {
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238 return(mixbuf);
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239 }
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240
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241 static void ARTS_CloseAudio(_THIS)
0
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242 {
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243 if ( mixbuf != NULL ) {
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244 SDL_FreeAudioMem(mixbuf);
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245 mixbuf = NULL;
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246 }
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247 if ( stream ) {
294
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248 SDL_NAME(arts_close_stream)(stream);
0
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249 stream = 0;
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250 }
294
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251 SDL_NAME(arts_free)();
0
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252 }
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253
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254 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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255 {
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256 int bits, frag_spec;
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257 Uint16 test_format, format;
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258
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259 /* Reset the timer synchronization flag */
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260 frame_ticks = 0.0;
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261
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262 mixbuf = NULL;
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263
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264 /* Try for a closest match on audio format */
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265 format = 0;
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266 bits = 0;
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267 for ( test_format = SDL_FirstAudioFormat(spec->format);
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268 ! format && test_format; ) {
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269 #ifdef DEBUG_AUDIO
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270 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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271 #endif
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272 switch ( test_format ) {
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273 case AUDIO_U8:
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274 bits = 8;
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275 format = 1;
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276 break;
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277 case AUDIO_S16LSB:
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278 bits = 16;
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279 format = 1;
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280 break;
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281 default:
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282 format = 0;
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283 break;
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284 }
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285 if ( ! format ) {
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286 test_format = SDL_NextAudioFormat();
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287 }
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288 }
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289 if ( format == 0 ) {
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290 SDL_SetError("Couldn't find any hardware audio formats");
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291 return(-1);
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292 }
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293 spec->format = test_format;
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294
294
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295 if ( SDL_NAME(arts_init)() != 0 ) {
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296 SDL_SetError("Unable to initialize ARTS");
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297 return(-1);
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298 }
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299 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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300
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301 /* Calculate the final parameters for this audio specification */
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302 SDL_CalculateAudioSpec(spec);
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303
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304 /* Determine the power of two of the fragment size */
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305 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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306 if ( (0x01<<frag_spec) != spec->size ) {
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307 SDL_SetError("Fragment size must be a power of two");
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308 return(-1);
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309 }
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310 frag_spec |= 0x00020000; /* two fragments, for low latency */
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311
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312 #ifdef ARTS_P_PACKET_SETTINGS
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313 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
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314 #else
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315 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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316 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
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317 #endif
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318 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
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319
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320 /* Allocate mixing buffer */
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321 mixlen = spec->size;
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322 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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323 if ( mixbuf == NULL ) {
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324 return(-1);
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325 }
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326 SDL_memset(mixbuf, spec->silence, spec->size);
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327
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328 /* Get the parent process id (we're the parent of the audio thread) */
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329 parent = getpid();
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330
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331 /* We're ready to rock and roll. :-) */
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332 return(0);
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333 }