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annotate src/audio/disk/SDL_diskaudio.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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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19 Sam Lantinga
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20 slouken@libsdl.org
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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 /* Output raw audio data to a file. */
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27
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28 #include <stdio.h>
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29 #include <string.h> /* For strerror() */
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <sys/stat.h>
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33 #include <sys/types.h>
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34 #include <sys/stat.h>
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35 #include <fcntl.h>
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36
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37
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38 #include "SDL_timer.h"
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39 #include "SDL_audio.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_audiodev_c.h"
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43 #include "SDL_diskaudio.h"
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44
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45 /* The tag name used by DISK audio */
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46 #define DISKAUD_DRIVER_NAME "disk"
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47
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48 /* environment variables and defaults. */
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49 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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50 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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51 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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52 #define DISKDEFAULT_WRITEDELAY 150
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53
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54 /* Audio driver functions */
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55 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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56 static void DISKAUD_WaitAudio(_THIS);
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57 static void DISKAUD_PlayAudio(_THIS);
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58 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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59 static void DISKAUD_CloseAudio(_THIS);
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60
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61 static const char *DISKAUD_GetOutputFilename(void)
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62 {
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63 const char *envr = SDL_getenv(DISKENVR_OUTFILE);
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64 return((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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65 }
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66
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67 /* Audio driver bootstrap functions */
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68 static int DISKAUD_Available(void)
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69 {
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70 #if 0
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71 int fd;
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72 int available;
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73 int exists = 0;
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74 struct stat statbuf;
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75 const char *fname = DISKAUD_GetOutputFilename();
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76 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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77 available = 0;
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78
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79 if ((envr) && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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80 if (stat(fname, &statbuf) == 0)
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81 exists = 1;
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82
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83 fd = open(fname, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
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84 if ( fd != -1 ) {
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85 available = 1;
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86 close(fd);
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87 if (!exists) {
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88 unlink(fname);
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89 }
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90 }
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91 }
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92 return(available);
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93 #else
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94 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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95 if ((envr) && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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96 return(1);
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97 }
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98
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99 return(0);
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100 #endif
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101 }
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102
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103 static void DISKAUD_DeleteDevice(SDL_AudioDevice *device)
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104 {
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105 SDL_free(device->hidden);
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106 SDL_free(device);
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107 }
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108
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109 static SDL_AudioDevice *DISKAUD_CreateDevice(int devindex)
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110 {
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111 SDL_AudioDevice *this;
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112 const char *envr;
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113
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114 /* Initialize all variables that we clean on shutdown */
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115 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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116 if ( this ) {
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117 SDL_memset(this, 0, (sizeof *this));
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118 this->hidden = (struct SDL_PrivateAudioData *)
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119 SDL_malloc((sizeof *this->hidden));
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120 }
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121 if ( (this == NULL) || (this->hidden == NULL) ) {
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122 SDL_OutOfMemory();
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123 if ( this ) {
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124 SDL_free(this);
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125 }
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126 return(0);
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127 }
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128 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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129
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130 envr = SDL_getenv(DISKENVR_WRITEDELAY);
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131 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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132
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133 /* Set the function pointers */
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134 this->OpenAudio = DISKAUD_OpenAudio;
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135 this->WaitAudio = DISKAUD_WaitAudio;
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136 this->PlayAudio = DISKAUD_PlayAudio;
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137 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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138 this->CloseAudio = DISKAUD_CloseAudio;
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139
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140 this->free = DISKAUD_DeleteDevice;
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141
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142 return this;
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143 }
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144
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145 AudioBootStrap DISKAUD_bootstrap = {
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146 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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147 DISKAUD_Available, DISKAUD_CreateDevice
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148 };
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149
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150 /* This function waits until it is possible to write a full sound buffer */
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151 static void DISKAUD_WaitAudio(_THIS)
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152 {
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153 SDL_Delay(this->hidden->write_delay);
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154 }
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155
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156 static void DISKAUD_PlayAudio(_THIS)
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157 {
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158 int written;
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159
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160 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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161 do {
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162 written = write(this->hidden->audio_fd,
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163 this->hidden->mixbuf,
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164 this->hidden->mixlen);
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165 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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166 SDL_Delay(1); /* Let a little CPU time go by */
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167 }
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168 } while ( (written < 0) &&
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169 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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170
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171 /* If we couldn't write, assume fatal error for now */
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172 if ( written < 0 ) {
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173 this->enabled = 0;
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174 }
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175 #ifdef DEBUG_AUDIO
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176 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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177 #endif
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178 }
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179
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180 static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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181 {
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182 return(this->hidden->mixbuf);
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183 }
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184
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185 static void DISKAUD_CloseAudio(_THIS)
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186 {
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187 if ( this->hidden->mixbuf != NULL ) {
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188 SDL_FreeAudioMem(this->hidden->mixbuf);
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189 this->hidden->mixbuf = NULL;
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190 }
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191 if ( this->hidden->audio_fd >= 0 ) {
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192 close(this->hidden->audio_fd);
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193 this->hidden->audio_fd = -1;
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194 }
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195 }
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196
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197 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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198 {
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199 const char *fname = DISKAUD_GetOutputFilename();
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200
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201 /* Open the audio device */
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202 this->hidden->audio_fd = open(fname, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
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203 if ( this->hidden->audio_fd < 0 ) {
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204 SDL_SetError("Couldn't open %s: %s", fname, strerror(errno));
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205 return(-1);
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206 }
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207
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208 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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209 " audio driver!\n Writing to file [%s].\n", fname);
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210
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211 /* Allocate mixing buffer */
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212 this->hidden->mixlen = spec->size;
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213 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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214 if ( this->hidden->mixbuf == NULL ) {
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215 return(-1);
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216 }
1336
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217 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
68
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218
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219 /* We're ready to rock and roll. :-) */
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220 return(0);
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221 }
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222