Mercurial > sdl-ios-xcode

annotate src/audio/disk/SDL_diskaudio.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device

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Audio bootstraps can now specify that a driver is only to be used if explicitly requested (for things like the "disk" driver that is always available but you would never want to default to using). Trimmed out code that can be handled by stubs in the core. The "dummy" driver is pretty damned small now. :)
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 21:27:53 +0000
parents 866c310e2cb5
children ef7f7be318da
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 return 1; /* always available. */
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68 }
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69
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70 static int
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71 DISKAUD_Init(SDL_AudioDriverImpl *impl)
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72 {
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73 /* Initialize all variables that we clean on shutdown */
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74 SDL_memset(impl, '\0', sizeof (SDL_AudioDriverImpl));
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75
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76 /* Set the function pointers */
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77 impl->OpenDevice = DISKAUD_OpenDevice;
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78 impl->WaitDevice = DISKAUD_WaitDevice;
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79 impl->PlayDevice = DISKAUD_PlayDevice;
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80 impl->GetDeviceBuf = DISKAUD_GetDeviceBuf;
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81 impl->CloseDevice = DISKAUD_CloseDevice;
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82
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83 return 1;
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84 }
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85
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86 AudioBootStrap DISKAUD_bootstrap = {
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87 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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88 DISKAUD_Available, DISKAUD_Init, 1
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89 };
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90
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91 /* This function waits until it is possible to write a full sound buffer */
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92 static void
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93 DISKAUD_WaitDevice(_THIS)
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94 {
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95 SDL_Delay(this->hidden->write_delay);
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96 }
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97
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98 static void
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99 DISKAUD_PlayDevice(_THIS)
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100 {
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101 int written;
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102
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103 /* Write the audio data */
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104 written = SDL_RWwrite(this->hidden->output,
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105 this->hidden->mixbuf, 1, this->hidden->mixlen);
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106
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107 /* If we couldn't write, assume fatal error for now */
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108 if ((Uint32) written != this->hidden->mixlen) {
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109 this->enabled = 0;
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110 }
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111 #ifdef DEBUG_AUDIO
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112 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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113 #endif
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114 }
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115
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116 static Uint8 *
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117 DISKAUD_GetDeviceBuf(_THIS)
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118 {
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119 return (this->hidden->mixbuf);
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120 }
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121
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122 static void
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123 DISKAUD_CloseDevice(_THIS)
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124 {
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125 if (this->hidden->mixbuf != NULL) {
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126 SDL_FreeAudioMem(this->hidden->mixbuf);
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127 this->hidden->mixbuf = NULL;
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128 }
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129 if (this->hidden->output != NULL) {
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130 SDL_RWclose(this->hidden->output);
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131 this->hidden->output = NULL;
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132 }
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133 SDL_free(this->hidden);
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134 this->hidden = NULL;
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135 }
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136
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137 static int
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138 DISKAUD_OpenDevice(_THIS, const char *devname, int iscapture)
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139 {
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140 const char *envr = SDL_getenv(DISKENVR_WRITEDELAY);
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141 const char *fname = DISKAUD_GetOutputFilename();
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142
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143 /* !!! FIXME: use device name for non-default filename? */
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144 if (devname != NULL) {
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145 SDL_SetError("Disk audio device name must be NULL");
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146 return 0;
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147 }
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148
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149 this->hidden = (struct SDL_PrivateAudioData *)
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150 SDL_malloc(sizeof (*this->hidden));
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151 if (this->hidden == NULL) {
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152 SDL_OutOfMemory();
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153 return 0;
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154 }
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155 SDL_memset(this->hidden, 0, sizeof (*this->hidden));
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156
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157 /* Open the audio device */
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158 this->hidden->output = SDL_RWFromFile(fname, "wb");
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159 if (this->hidden->output == NULL) {
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160 DISKAUD_CloseDevice(this);
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161 return 0;
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162 }
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163
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164 /* Allocate mixing buffer */
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165 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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166 if (this->hidden->mixbuf == NULL) {
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167 DISKAUD_CloseDevice(this);
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168 return 0;
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169 }
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170 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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171
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172 this->hidden->mixlen = this->spec.size;
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173 this->hidden->write_delay =
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174 (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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175
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176 #if HAVE_STDIO_H
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177 fprintf(stderr,
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178 "WARNING: You are using the SDL disk writer audio driver!\n"
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179 " Writing to file [%s].\n", fname);
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180 #endif
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181
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182 /* We're ready to rock and roll. :-) */
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183 return 1;
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184 }
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185
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186 /* vi: set ts=4 sw=4 expandtab: */