Mercurial > sdl-ios-xcode

annotate src/audio/disk/SDL_diskaudio.c @ 858:5db50aa5bf08

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Date: Wed, 25 Feb 2004 06:41:17 -0500 From: "Ryan C. Gordon" Subject: Re: MacOS X bugs... This isn't an ideal patch (trying to open a joystick that has previously been unplugged will report success, but it'll just never give any input, etc), but it handles the worst case of deadlock in the event subsystem.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 26 Feb 2004 13:45:22 +0000
parents b8d311d90021
children c9b51268668f
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 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();
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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);
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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