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annotate src/audio/disk/SDL_diskaudio.c @ 3792:866c310e2cb5 SDL-ryan-multiple-audio-device

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Changed some 1.3 audio symbol names.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 03 Oct 2006 22:17:59 +0000
parents 37c9c4590689
children c8b3d3d13ed1
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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21
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22 This file written by Ryan C. Gordon (icculus@icculus.org)
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23 */
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24 #include "SDL_config.h"
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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 #if HAVE_STDIO_H
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29 #include <stdio.h>
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30 #endif
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31
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32 #include "SDL_rwops.h"
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33 #include "SDL_timer.h"
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34 #include "SDL_audio.h"
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35 #include "../SDL_audiomem.h"
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36 #include "../SDL_audio_c.h"
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37 #include "../SDL_audiodev_c.h"
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38 #include "SDL_diskaudio.h"
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39
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40 /* The tag name used by DISK audio */
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41 #define DISKAUD_DRIVER_NAME "disk"
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42
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43 /* environment variables and defaults. */
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44 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"
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45 #define DISKDEFAULT_OUTFILE "sdlaudio.raw"
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46 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"
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47 #define DISKDEFAULT_WRITEDELAY 150
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48
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49 /* Audio driver functions */
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50 static int DISKAUD_OpenDevice(_THIS, const char *devname, int iscapture);
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51 static void DISKAUD_WaitDevice(_THIS);
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52 static void DISKAUD_PlayDevice(_THIS);
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53 static Uint8 *DISKAUD_GetDeviceBuf(_THIS);
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54 static void DISKAUD_CloseDevice(_THIS);
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55
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56 static const char *
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57 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
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65 DISKAUD_Available(void)
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66 {
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67 /* !!! FIXME: check this at a higher level... */
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68 /* only ever use this driver if explicitly requested. */
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69 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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70 if (envr && (SDL_strcasecmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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71 return (1);
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72 }
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73 return (0);
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74 }
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75
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76 static int
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77 DISKAUD_Init(SDL_AudioDriverImpl *impl)
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78 {
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79 /* Initialize all variables that we clean on shutdown */
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80 SDL_memset(impl, '\0', sizeof (SDL_AudioDriverImpl));
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81
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82 /* Set the function pointers */
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83 impl->OpenDevice = DISKAUD_OpenDevice;
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84 impl->WaitDevice = DISKAUD_WaitDevice;
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85 impl->PlayDevice = DISKAUD_PlayDevice;
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86 impl->GetDeviceBuf = DISKAUD_GetDeviceBuf;
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87 impl->CloseDevice = DISKAUD_CloseDevice;
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88
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89 return 1;
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90 }
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91
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92 AudioBootStrap DISKAUD_bootstrap = {
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93 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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94 DISKAUD_Available, DISKAUD_Init
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95 };
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96
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97 /* This function waits until it is possible to write a full sound buffer */
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98 static void
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99 DISKAUD_WaitDevice(_THIS)
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100 {
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101 SDL_Delay(this->hidden->write_delay);
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102 }
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103
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104 static void
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105 DISKAUD_PlayDevice(_THIS)
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106 {
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107 int written;
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108
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109 /* Write the audio data */
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110 written = SDL_RWwrite(this->hidden->output,
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111 this->hidden->mixbuf, 1, this->hidden->mixlen);
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112
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113 /* If we couldn't write, assume fatal error for now */
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114 if ((Uint32) written != this->hidden->mixlen) {
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115 this->enabled = 0;
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116 }
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117 #ifdef DEBUG_AUDIO
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118 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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119 #endif
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120 }
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121
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122 static Uint8 *
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123 DISKAUD_GetDeviceBuf(_THIS)
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124 {
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125 return (this->hidden->mixbuf);
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126 }
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127
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128 static void
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129 DISKAUD_CloseDevice(_THIS)
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130 {
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131 if (this->hidden->mixbuf != NULL) {
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132 SDL_FreeAudioMem(this->hidden->mixbuf);
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133 this->hidden->mixbuf = NULL;
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134 }
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135 if (this->hidden->output != NULL) {
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136 SDL_RWclose(this->hidden->output);
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137 this->hidden->output = NULL;
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138 }
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139 SDL_free(this->hidden);
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140 this->hidden = NULL;
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141 }
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142
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143 static int
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144 DISKAUD_OpenDevice(_THIS, const char *devname, int iscapture)
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145 {
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146 const char *envr = SDL_getenv(DISKENVR_WRITEDELAY);
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147 const char *fname = DISKAUD_GetOutputFilename();
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148
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149 /* !!! FIXME: use device name for non-default filename? */
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150 if (devname != NULL) {
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151 SDL_SetError("Disk audio device name must be NULL");
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152 return 0;
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153 }
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154
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155 this->hidden = (struct SDL_PrivateAudioData *)
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156 SDL_malloc(sizeof (*this->hidden));
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157 if (this->hidden == NULL) {
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158 SDL_OutOfMemory();
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159 return 0;
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160 }
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161 SDL_memset(this->hidden, 0, sizeof (*this->hidden));
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162
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163 /* Open the audio device */
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164 this->hidden->output = SDL_RWFromFile(fname, "wb");
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165 if (this->hidden->output == NULL) {
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166 DISKAUD_CloseDevice(this);
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167 return 0;
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168 }
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169
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170 /* Allocate mixing buffer */
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171 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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172 if (this->hidden->mixbuf == NULL) {
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173 DISKAUD_CloseDevice(this);
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174 return 0;
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175 }
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176 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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177
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178 this->hidden->mixlen = this->spec.size;
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179 this->hidden->write_delay =
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180 (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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181
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182 #if HAVE_STDIO_H
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183 fprintf(stderr,
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184 "WARNING: You are using the SDL disk writer audio driver!\n"
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185 " Writing to file [%s].\n", fname);
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186 #endif
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187
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188 /* We're ready to rock and roll. :-) */
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189 return 1;
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190 }
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191
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192 /* vi: set ts=4 sw=4 expandtab: */