Mercurial > sdl-ios-xcode

annotate src/audio/disk/SDL_diskaudio.c @ 4001:6831b8723a85 SDL-1.2

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Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents c439dad53df8
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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_OpenAudio(_THIS, SDL_AudioSpec *spec);
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51 static void DISKAUD_WaitAudio(_THIS);
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52 static void DISKAUD_PlayAudio(_THIS);
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53 static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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54 static void DISKAUD_CloseAudio(_THIS);
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55
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56 static const char *DISKAUD_GetOutputFilename(void)
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57 {
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58 const char *envr = SDL_getenv(DISKENVR_OUTFILE);
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59 return((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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60 }
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61
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62 /* Audio driver bootstrap functions */
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63 static int DISKAUD_Available(void)
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64 {
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65 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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66 if (envr && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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67 return(1);
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68 }
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69 return(0);
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70 }
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71
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72 static void DISKAUD_DeleteDevice(SDL_AudioDevice *device)
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73 {
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74 SDL_free(device->hidden);
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75 SDL_free(device);
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76 }
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77
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78 static SDL_AudioDevice *DISKAUD_CreateDevice(int devindex)
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79 {
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80 SDL_AudioDevice *this;
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81 const char *envr;
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82
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83 /* Initialize all variables that we clean on shutdown */
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84 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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85 if ( this ) {
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86 SDL_memset(this, 0, (sizeof *this));
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87 this->hidden = (struct SDL_PrivateAudioData *)
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88 SDL_malloc((sizeof *this->hidden));
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89 }
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90 if ( (this == NULL) || (this->hidden == NULL) ) {
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91 SDL_OutOfMemory();
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92 if ( this ) {
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93 SDL_free(this);
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94 }
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95 return(0);
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96 }
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97 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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98
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99 envr = SDL_getenv(DISKENVR_WRITEDELAY);
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100 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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101
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102 /* Set the function pointers */
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103 this->OpenAudio = DISKAUD_OpenAudio;
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104 this->WaitAudio = DISKAUD_WaitAudio;
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105 this->PlayAudio = DISKAUD_PlayAudio;
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106 this->GetAudioBuf = DISKAUD_GetAudioBuf;
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107 this->CloseAudio = DISKAUD_CloseAudio;
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108
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109 this->free = DISKAUD_DeleteDevice;
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110
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111 return this;
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112 }
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113
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114 AudioBootStrap DISKAUD_bootstrap = {
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115 DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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116 DISKAUD_Available, DISKAUD_CreateDevice
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117 };
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118
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119 /* This function waits until it is possible to write a full sound buffer */
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120 static void DISKAUD_WaitAudio(_THIS)
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121 {
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122 SDL_Delay(this->hidden->write_delay);
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123 }
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124
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125 static void DISKAUD_PlayAudio(_THIS)
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126 {
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127 int written;
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128
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129 /* Write the audio data */
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130 written = SDL_RWwrite(this->hidden->output,
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131 this->hidden->mixbuf, 1,
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132 this->hidden->mixlen);
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133
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134 /* If we couldn't write, assume fatal error for now */
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135 if ( (Uint32)written != this->hidden->mixlen ) {
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136 this->enabled = 0;
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137 }
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138 #ifdef DEBUG_AUDIO
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139 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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140 #endif
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141 }
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142
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143 static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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144 {
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145 return(this->hidden->mixbuf);
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146 }
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147
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148 static void DISKAUD_CloseAudio(_THIS)
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149 {
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150 if ( this->hidden->mixbuf != NULL ) {
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151 SDL_FreeAudioMem(this->hidden->mixbuf);
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152 this->hidden->mixbuf = NULL;
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153 }
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154 if ( this->hidden->output != NULL ) {
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155 SDL_RWclose(this->hidden->output);
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156 this->hidden->output = NULL;
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157 }
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158 }
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159
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160 static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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161 {
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162 const char *fname = DISKAUD_GetOutputFilename();
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163
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164 /* Open the audio device */
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165 this->hidden->output = SDL_RWFromFile(fname, "wb");
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166 if ( this->hidden->output == NULL ) {
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167 return(-1);
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168 }
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169
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170 #if HAVE_STDIO_H
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171 fprintf(stderr, "WARNING: You are using the SDL disk writer"
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172 " audio driver!\n Writing to file [%s].\n", fname);
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173 #endif
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174
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175 /* Allocate mixing buffer */
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176 this->hidden->mixlen = spec->size;
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177 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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178 if ( this->hidden->mixbuf == NULL ) {
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179 return(-1);
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180 }
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181 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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182
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183 /* We're ready to rock and roll. :-) */
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184 return(0);
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185 }
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186