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annotate src/audio/disk/SDL_diskaudio.c @ 1538:b1f8c14f0df5

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 03:50:34 +0000
parents 8dfa9a6d69a5
children 84535f702874
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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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 #include "SDL_config.h"
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26
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27 /* Output raw audio data to a file. */
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28
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29 #if HAVE_STDIO_H
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30 #include <stdio.h>
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31 #endif
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32
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33 #include "SDL_rwops.h"
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34 #include "SDL_timer.h"
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35 #include "SDL_audio.h"
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36 #include "../SDL_audiomem.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_audiodev_c.h"
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39 #include "SDL_diskaudio.h"
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40
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41 /* The tag name used by DISK audio */
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42 #define DISKAUD_DRIVER_NAME "disk"
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43
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44 /* environment variables and defaults. */
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45 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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46 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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47 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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48 #define DISKDEFAULT_WRITEDELAY 150
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49
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50 /* Audio driver functions */
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51 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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52 static void DISKAUD_WaitAudio(_THIS);
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53 static void DISKAUD_PlayAudio(_THIS);
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54 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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55 static void DISKAUD_CloseAudio(_THIS);
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56
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57 static const char *DISKAUD_GetOutputFilename(void)
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58 {
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59 const char *envr = SDL_getenv(DISKENVR_OUTFILE);
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60 return((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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61 }
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62
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63 /* Audio driver bootstrap functions */
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64 static int DISKAUD_Available(void)
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65 {
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66 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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67 if (envr && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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68 return(1);
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69 }
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70 return(0);
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71 }
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72
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73 static void DISKAUD_DeleteDevice(SDL_AudioDevice *device)
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74 {
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75 SDL_free(device->hidden);
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76 SDL_free(device);
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77 }
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78
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79 static SDL_AudioDevice *DISKAUD_CreateDevice(int devindex)
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80 {
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81 SDL_AudioDevice *this;
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82 const char *envr;
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83
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84 /* Initialize all variables that we clean on shutdown */
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85 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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86 if ( this ) {
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87 SDL_memset(this, 0, (sizeof *this));
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88 this->hidden = (struct SDL_PrivateAudioData *)
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89 SDL_malloc((sizeof *this->hidden));
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90 }
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91 if ( (this == NULL) || (this->hidden == NULL) ) {
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92 SDL_OutOfMemory();
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93 if ( this ) {
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94 SDL_free(this);
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95 }
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96 return(0);
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97 }
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98 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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99
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100 envr = SDL_getenv(DISKENVR_WRITEDELAY);
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101 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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102
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103 /* Set the function pointers */
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104 this->OpenAudio = DISKAUD_OpenAudio;
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105 this->WaitAudio = DISKAUD_WaitAudio;
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106 this->PlayAudio = DISKAUD_PlayAudio;
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107 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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108 this->CloseAudio = DISKAUD_CloseAudio;
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109
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110 this->free = DISKAUD_DeleteDevice;
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111
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112 return this;
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113 }
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114
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115 AudioBootStrap DISKAUD_bootstrap = {
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116 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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117 DISKAUD_Available, DISKAUD_CreateDevice
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118 };
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119
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120 /* This function waits until it is possible to write a full sound buffer */
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121 static void DISKAUD_WaitAudio(_THIS)
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122 {
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123 SDL_Delay(this->hidden->write_delay);
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124 }
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125
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126 static void DISKAUD_PlayAudio(_THIS)
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127 {
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128 int written;
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129
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130 /* Write the audio data */
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131 written = SDL_RWwrite(this->hidden->output,
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132 this->hidden->mixbuf, 1,
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133 this->hidden->mixlen);
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134
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135 /* If we couldn't write, assume fatal error for now */
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136 if ( written != this->hidden->mixlen ) {
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137 this->enabled = 0;
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138 }
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139 #ifdef DEBUG_AUDIO
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140 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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141 #endif
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142 }
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143
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144 static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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145 {
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146 return(this->hidden->mixbuf);
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147 }
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148
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149 static void DISKAUD_CloseAudio(_THIS)
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150 {
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151 if ( this->hidden->mixbuf != NULL ) {
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152 SDL_FreeAudioMem(this->hidden->mixbuf);
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153 this->hidden->mixbuf = NULL;
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154 }
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155 if ( this->hidden->output != NULL ) {
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156 SDL_RWclose(this->hidden->output);
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157 this->hidden->output = NULL;
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158 }
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159 }
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160
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161 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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162 {
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163 const char *fname = DISKAUD_GetOutputFilename();
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164
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165 /* Open the audio device */
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166 this->hidden->output = SDL_RWFromFile(fname, "wb");
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167 if ( this->hidden->output == NULL ) {
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168 return(-1);
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169 }
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170
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171 #if HAVE_STDIO_H
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172 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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173 " audio driver!\n Writing to file [%s].\n", fname);
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174 #endif
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175
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176 /* Allocate mixing buffer */
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177 this->hidden->mixlen = spec->size;
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178 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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179 if ( this->hidden->mixbuf == NULL ) {
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180 return(-1);
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181 }
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182 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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183
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184 /* We're ready to rock and roll. :-) */
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185 return(0);
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186 }
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187