annotate src/audio/arts/SDL_artsaudio.c @ 864:0c892e99b65b

Date: Sun, 29 Feb 2004 20:28:27 +0200 From: Martin_Storsj Subject: Slight bug in ESD and aRts When I experimented with the ALSA-patch, I found a slight bug in the Load{ESD,ARTS}Library-functions. The check of whether a function pointer was correctly loaded looks like this right now: *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); if ( ! esd_functions[i].func ) Isn't that supposed to be ( ! *esd_functions[i].func )?
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Mar 2004 12:45:22 +0000
parents b8d311d90021
children 03fb90fc135e
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <sys/types.h>
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31 #include <stdlib.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34 #include <errno.h>
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35 #include <signal.h>
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36 #include <unistd.h>
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37
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38 #include "SDL_audio.h"
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39 #include "SDL_error.h"
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40 #include "SDL_audiomem.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_timer.h"
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43 #include "SDL_audiodev_c.h"
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44 #include "SDL_artsaudio.h"
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45
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46 #ifdef ARTSC_DYNAMIC
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47 #include "SDL_name.h"
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48 #include "SDL_loadso.h"
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49 #else
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50 #define SDL_NAME(X) X
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51 #endif
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52
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53 /* The tag name used by artsc audio */
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54 #define ARTSC_DRIVER_NAME "artsc"
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55
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56 /* Audio driver functions */
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57 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec);
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58 static void ARTSC_WaitAudio(_THIS);
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59 static void ARTSC_PlayAudio(_THIS);
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60 static Uint8 *ARTSC_GetAudioBuf(_THIS);
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61 static void ARTSC_CloseAudio(_THIS);
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62
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63 #ifdef ARTSC_DYNAMIC
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64
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65 static const char *arts_library = ARTSC_DYNAMIC;
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66 static void *arts_handle = NULL;
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67 static int arts_loaded = 0;
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68
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69 static int (*SDL_NAME(arts_init))(void);
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70 static void (*SDL_NAME(arts_free))(void);
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71 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name);
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72 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value);
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73 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param);
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74 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count);
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75 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s);
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76
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77 static struct {
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78 const char *name;
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79 void **func;
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80 } arts_functions[] = {
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81 { "arts_init", (void **)&SDL_NAME(arts_init) },
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82 { "arts_free", (void **)&SDL_NAME(arts_free) },
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83 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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84 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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85 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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86 { "arts_write", (void **)&SDL_NAME(arts_write) },
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87 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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88 };
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89
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90 static void UnloadARTSLibrary()
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91 {
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92 if ( arts_loaded ) {
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93 SDL_UnloadObject(arts_handle);
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94 arts_handle = NULL;
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95 arts_loaded = 0;
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96 }
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97 }
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98
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99 static int LoadARTSLibrary(void)
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100 {
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101 int i, retval = -1;
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102
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103 arts_handle = SDL_LoadObject(arts_library);
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104 if ( arts_handle ) {
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105 arts_loaded = 1;
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106 retval = 0;
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107 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) {
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108 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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109 if ( !*arts_functions[i].func ) {
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110 retval = -1;
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111 UnloadARTSLibrary();
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112 break;
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113 }
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114 }
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115 }
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116 return retval;
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117 }
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118
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119 #else
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120
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121 static void UnloadARTSLibrary()
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122 {
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123 return;
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124 }
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125
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126 static int LoadARTSLibrary(void)
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127 {
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128 return 0;
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129 }
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130
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131 #endif /* ARTSC_DYNAMIC */
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132
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133 /* Audio driver bootstrap functions */
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134
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135 static int Audio_Available(void)
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136 {
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137 int available = 0;
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138
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139 if ( LoadARTSLibrary() < 0 ) {
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140 return available;
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141 }
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142 if ( SDL_NAME(arts_init)() == 0 ) {
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143 available = 1;
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144 SDL_NAME(arts_free)();
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145 }
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146 UnloadARTSLibrary();
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147
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148 return available;
0
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149 }
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150
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151 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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152 {
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153 free(device->hidden);
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154 free(device);
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155 UnloadARTSLibrary();
0
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156 }
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157
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158 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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159 {
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160 SDL_AudioDevice *this;
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161
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162 /* Initialize all variables that we clean on shutdown */
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163 LoadARTSLibrary();
0
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164 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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165 if ( this ) {
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166 memset(this, 0, (sizeof *this));
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167 this->hidden = (struct SDL_PrivateAudioData *)
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168 malloc((sizeof *this->hidden));
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169 }
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170 if ( (this == NULL) || (this->hidden == NULL) ) {
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171 SDL_OutOfMemory();
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172 if ( this ) {
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173 free(this);
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174 }
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175 return(0);
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176 }
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177 memset(this->hidden, 0, (sizeof *this->hidden));
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178 stream = 0;
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179
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180 /* Set the function pointers */
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181 this->OpenAudio = ARTSC_OpenAudio;
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182 this->WaitAudio = ARTSC_WaitAudio;
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183 this->PlayAudio = ARTSC_PlayAudio;
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184 this->GetAudioBuf = ARTSC_GetAudioBuf;
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185 this->CloseAudio = ARTSC_CloseAudio;
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186
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187 this->free = Audio_DeleteDevice;
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188
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189 return this;
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190 }
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191
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192 AudioBootStrap ARTSC_bootstrap = {
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193 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer",
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194 Audio_Available, Audio_CreateDevice
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195 };
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196
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197 /* This function waits until it is possible to write a full sound buffer */
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198 static void ARTSC_WaitAudio(_THIS)
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199 {
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200 Sint32 ticks;
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201
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202 /* Check to see if the thread-parent process is still alive */
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203 { static int cnt = 0;
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204 /* Note that this only works with thread implementations
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205 that use a different process id for each thread.
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206 */
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207 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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208 if ( kill(parent, 0) < 0 ) {
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209 this->enabled = 0;
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210 }
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211 }
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212 }
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213
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214 /* Use timer for general audio synchronization */
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215 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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216 if ( ticks > 0 ) {
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217 SDL_Delay(ticks);
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218 }
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219 }
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220
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221 static void ARTSC_PlayAudio(_THIS)
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222 {
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223 int written;
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224
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225 /* Write the audio data */
294
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diff changeset
226 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
0
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227
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228 /* If timer synchronization is enabled, set the next write frame */
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229 if ( frame_ticks ) {
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230 next_frame += frame_ticks;
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231 }
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232
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233 /* If we couldn't write, assume fatal error for now */
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234 if ( written < 0 ) {
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235 this->enabled = 0;
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236 }
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237 #ifdef DEBUG_AUDIO
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238 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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239 #endif
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240 }
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241
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242 static Uint8 *ARTSC_GetAudioBuf(_THIS)
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243 {
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244 return(mixbuf);
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245 }
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246
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247 static void ARTSC_CloseAudio(_THIS)
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248 {
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249 if ( mixbuf != NULL ) {
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250 SDL_FreeAudioMem(mixbuf);
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251 mixbuf = NULL;
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252 }
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253 if ( stream ) {
294
d2d48e10f370 Added a new header file: SDL_loadso.h
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diff changeset
254 SDL_NAME(arts_close_stream)(stream);
0
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255 stream = 0;
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diff changeset
256 }
294
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diff changeset
257 SDL_NAME(arts_free)();
0
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258 }
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259
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260 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
261 {
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262 int bits, frag_spec;
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263 Uint16 test_format, format;
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diff changeset
264
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265 /* Reset the timer synchronization flag */
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266 frame_ticks = 0.0;
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267
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268 mixbuf = NULL;
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269
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270 /* Try for a closest match on audio format */
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271 format = 0;
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diff changeset
272 bits = 0;
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273 for ( test_format = SDL_FirstAudioFormat(spec->format);
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diff changeset
274 ! format && test_format; ) {
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275 #ifdef DEBUG_AUDIO
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276 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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diff changeset
277 #endif
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diff changeset
278 switch ( test_format ) {
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diff changeset
279 case AUDIO_U8:
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280 bits = 8;
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281 format = 1;
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diff changeset
282 break;
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diff changeset
283 case AUDIO_S16LSB:
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284 bits = 16;
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diff changeset
285 format = 1;
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diff changeset
286 break;
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diff changeset
287 default:
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diff changeset
288 format = 0;
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diff changeset
289 break;
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diff changeset
290 }
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diff changeset
291 if ( ! format ) {
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diff changeset
292 test_format = SDL_NextAudioFormat();
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diff changeset
293 }
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diff changeset
294 }
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diff changeset
295 if ( format == 0 ) {
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diff changeset
296 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
297 return(-1);
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diff changeset
298 }
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diff changeset
299 spec->format = test_format;
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diff changeset
300
294
d2d48e10f370 Added a new header file: SDL_loadso.h
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diff changeset
301 if ( SDL_NAME(arts_init)() != 0 ) {
d2d48e10f370 Added a new header file: SDL_loadso.h
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diff changeset
302 SDL_SetError("Unable to initialize ARTS");
d2d48e10f370 Added a new header file: SDL_loadso.h
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diff changeset
303 return(-1);
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diff changeset
304 }
d2d48e10f370 Added a new header file: SDL_loadso.h
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diff changeset
305 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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diff changeset
306
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diff changeset
307 /* Calculate the final parameters for this audio specification */
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diff changeset
308 SDL_CalculateAudioSpec(spec);
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diff changeset
309
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parents:
diff changeset
310 /* Determine the power of two of the fragment size */
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diff changeset
311 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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parents:
diff changeset
312 if ( (0x01<<frag_spec) != spec->size ) {
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parents:
diff changeset
313 SDL_SetError("Fragment size must be a power of two");
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parents:
diff changeset
314 return(-1);
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diff changeset
315 }
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diff changeset
316 frag_spec |= 0x00020000; /* two fragments, for low latency */
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parents:
diff changeset
317
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diff changeset
318 #ifdef ARTS_P_PACKET_SETTINGS
294
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319 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
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320 #else
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321 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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322 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
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323 #endif
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324 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
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325
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326 /* Allocate mixing buffer */
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327 mixlen = spec->size;
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328 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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329 if ( mixbuf == NULL ) {
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330 return(-1);
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331 }
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332 memset(mixbuf, spec->silence, spec->size);
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333
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334 /* Get the parent process id (we're the parent of the audio thread) */
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335 parent = getpid();
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336
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337 /* We're ready to rock and roll. :-) */
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338 return(0);
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339 }