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annotate src/audio/disk/SDL_diskaudio.c @ 86:13e4c612098d

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Dummy audio and video drivers are enabled (thanks Ryan!)
author Sam Lantinga <slouken@lokigames.com>
date Mon, 02 Jul 2001 00:20:29 +0000
parents ac6645260d31
children e8157fcb3114
rev   line source
68
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
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21
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22 This file hacked^H^H^H^H^H^Hwritten by Ryan C. Gordon
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23 (icculus@linuxgames.com)
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24 */
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25
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26 #ifdef SAVE_RCSID
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27 static char rcsid =
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28 "@(#) $Id$";
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29 #endif
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30
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31 /* Output raw audio data to a file. */
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32
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33 #include <stdlib.h>
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34 #include <stdio.h>
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35 #include <string.h>
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36 #include <errno.h>
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37 #include <unistd.h>
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38 #include <sys/stat.h>
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39 #include <sys/types.h>
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40 #include <sys/stat.h>
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41 #include <fcntl.h>
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42
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43
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44 #include "SDL_audio.h"
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45 #include "SDL_error.h"
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46 #include "SDL_audiomem.h"
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47 #include "SDL_audio_c.h"
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48 #include "SDL_timer.h"
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49 #include "SDL_audiodev_c.h"
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50 #include "SDL_diskaudio.h"
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51
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52 /* The tag name used by DISK audio */
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53 #define DISKAUD_DRIVER_NAME "disk"
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54
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55 /* environment variables and defaults. */
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56 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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57 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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58 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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59 #define DISKDEFAULT_WRITEDELAY 150
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60
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61 /* Audio driver functions */
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62 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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63 static void DISKAUD_WaitAudio(_THIS);
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64 static void DISKAUD_PlayAudio(_THIS);
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65 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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66 static void DISKAUD_CloseAudio(_THIS);
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67
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68 static const char *DISKAUD_GetOutputFilename(void)
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69 {
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70 const char *envr = getenv(DISKENVR_OUTFILE);
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71 return((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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72 }
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73
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74 /* Audio driver bootstrap functions */
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75 static int DISKAUD_Available(void)
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76 {
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77 #if 0
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78 int fd;
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79 int available;
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80 int exists = 0;
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81 struct stat statbuf;
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82 const char *fname = DISKAUD_GetOutputFilename();
86
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83 const char *envr = getenv("SDL_AUDIODRIVER");
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84 available = 0;
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85
86
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86 if ((envr) && (strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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87 if (stat(fname, &statbuf) == 0)
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88 exists = 1;
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89
86
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90 fd = open(fname, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
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91 if ( fd != -1 ) {
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92 available = 1;
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93 close(fd);
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94 if (!exists) {
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95 unlink(fname);
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96 }
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97 }
68
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98 }
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99 return(available);
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100 #else
86
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101 const char *envr = getenv("SDL_AUDIODRIVER");
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102 if ((envr) && (strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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103 return(1);
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104 }
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105
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106 return(0);
68
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107 #endif
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108 }
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109
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110 static void DISKAUD_DeleteDevice(SDL_AudioDevice *device)
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111 {
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112 free(device->hidden);
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113 free(device);
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114 }
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115
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116 static SDL_AudioDevice *DISKAUD_CreateDevice(int devindex)
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117 {
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118 SDL_AudioDevice *this;
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119 const char *envr;
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120
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121 /* Initialize all variables that we clean on shutdown */
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122 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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123 if ( this ) {
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124 memset(this, 0, (sizeof *this));
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125 this->hidden = (struct SDL_PrivateAudioData *)
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126 malloc((sizeof *this->hidden));
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127 }
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128 if ( (this == NULL) || (this->hidden == NULL) ) {
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129 SDL_OutOfMemory();
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130 if ( this ) {
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131 free(this);
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132 }
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133 return(0);
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134 }
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135 memset(this->hidden, 0, (sizeof *this->hidden));
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136
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137 envr = getenv(DISKENVR_WRITEDELAY);
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138 this->hidden->write_delay = (envr) ? atoi(envr) : DISKDEFAULT_WRITEDELAY;
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139
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140 /* Set the function pointers */
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141 this->OpenAudio = DISKAUD_OpenAudio;
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142 this->WaitAudio = DISKAUD_WaitAudio;
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143 this->PlayAudio = DISKAUD_PlayAudio;
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144 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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145 this->CloseAudio = DISKAUD_CloseAudio;
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146
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147 this->free = DISKAUD_DeleteDevice;
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148
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149 return this;
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150 }
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151
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152 AudioBootStrap DISKAUD_bootstrap = {
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153 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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154 DISKAUD_Available, DISKAUD_CreateDevice
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155 };
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156
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157 /* This function waits until it is possible to write a full sound buffer */
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158 static void DISKAUD_WaitAudio(_THIS)
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159 {
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160 SDL_Delay(this->hidden->write_delay);
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161 }
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162
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163 static void DISKAUD_PlayAudio(_THIS)
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164 {
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165 int written;
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166
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167 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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168 do {
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169 written = write(this->hidden->audio_fd,
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170 this->hidden->mixbuf,
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171 this->hidden->mixlen);
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172 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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173 SDL_Delay(1); /* Let a little CPU time go by */
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174 }
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175 } while ( (written < 0) &&
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176 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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177
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178 /* If we couldn't write, assume fatal error for now */
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179 if ( written < 0 ) {
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180 this->enabled = 0;
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181 }
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182 #ifdef DEBUG_AUDIO
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183 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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184 #endif
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185 }
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186
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187 static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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188 {
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189 return(this->hidden->mixbuf);
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190 }
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191
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192 static void DISKAUD_CloseAudio(_THIS)
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193 {
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194 if ( this->hidden->mixbuf != NULL ) {
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195 SDL_FreeAudioMem(this->hidden->mixbuf);
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196 this->hidden->mixbuf = NULL;
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197 }
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198 if ( this->hidden->audio_fd >= 0 ) {
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199 close(this->hidden->audio_fd);
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200 this->hidden->audio_fd = -1;
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201 }
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202 }
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203
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204 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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205 {
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206 const char *fname = DISKAUD_GetOutputFilename();
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207
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208 /* Open the audio device */
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209 this->hidden->audio_fd = open(fname, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
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210 if ( this->hidden->audio_fd < 0 ) {
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211 SDL_SetError("Couldn't open %s: %s", fname, strerror(errno));
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212 return(-1);
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213 }
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214
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215 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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216 " audio driver!\n Writing to file [%s].\n", fname);
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217
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218 /* Allocate mixing buffer */
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219 this->hidden->mixlen = spec->size;
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220 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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221 if ( this->hidden->mixbuf == NULL ) {
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222 return(-1);
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223 }
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224 memset(this->hidden->mixbuf, spec->silence, spec->size);
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225
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226 /* We're ready to rock and roll. :-) */
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227 return(0);
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228 }
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229