Mercurial > sdl-ios-xcode
annotate src/audio/disk/SDL_diskaudio.c @ 4419:5e7e1f1a4056
Changed revision details to be a string (an hg changeset) instead of an int.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Sun, 28 Feb 2010 02:07:40 -0500 |
parents | 4160ba33b597 |
children | b530ef003506 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
3697 | 3 Copyright (C) 1997-2010 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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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_diskaudio.h" |
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38 |
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39 /* The tag name used by DISK audio */ |
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40 #define DISKAUD_DRIVER_NAME "disk" |
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41 |
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42 /* environment variables and defaults. */ |
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43 #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE" |
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44 #define DISKDEFAULT_OUTFILE "sdlaudio.raw" |
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45 #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY" |
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46 #define DISKDEFAULT_WRITEDELAY 150 |
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47 |
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48 static const char * |
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49 DISKAUD_GetOutputFilename(const char *devname) |
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50 { |
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51 if (devname == NULL) { |
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52 devname = SDL_getenv(DISKENVR_OUTFILE); |
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53 if (devname == NULL) { |
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54 devname = DISKDEFAULT_OUTFILE; |
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55 } |
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56 } |
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57 return devname; |
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58 } |
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59 |
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60 /* This function waits until it is possible to write a full sound buffer */ |
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61 static void |
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62 DISKAUD_WaitDevice(_THIS) |
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63 { |
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64 SDL_Delay(this->hidden->write_delay); |
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65 } |
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66 |
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67 static void |
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68 DISKAUD_PlayDevice(_THIS) |
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69 { |
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70 size_t written; |
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71 |
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72 /* Write the audio data */ |
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73 written = SDL_RWwrite(this->hidden->output, |
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74 this->hidden->mixbuf, 1, this->hidden->mixlen); |
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75 |
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76 /* If we couldn't write, assume fatal error for now */ |
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77 if (written != this->hidden->mixlen) { |
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78 this->enabled = 0; |
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79 } |
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80 #ifdef DEBUG_AUDIO |
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81 fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
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82 #endif |
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83 } |
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84 |
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85 static Uint8 * |
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86 DISKAUD_GetDeviceBuf(_THIS) |
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87 { |
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88 return (this->hidden->mixbuf); |
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89 } |
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90 |
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91 static void |
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92 DISKAUD_CloseDevice(_THIS) |
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93 { |
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94 if (this->hidden != NULL) { |
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95 if (this->hidden->mixbuf != NULL) { |
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96 SDL_FreeAudioMem(this->hidden->mixbuf); |
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97 this->hidden->mixbuf = NULL; |
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98 } |
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99 if (this->hidden->output != NULL) { |
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100 SDL_RWclose(this->hidden->output); |
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101 this->hidden->output = NULL; |
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102 } |
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103 SDL_free(this->hidden); |
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104 this->hidden = NULL; |
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105 } |
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106 } |
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107 |
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108 static int |
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109 DISKAUD_OpenDevice(_THIS, const char *devname, int iscapture) |
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110 { |
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111 const char *envr = SDL_getenv(DISKENVR_WRITEDELAY); |
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112 const char *fname = DISKAUD_GetOutputFilename(devname); |
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113 |
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114 this->hidden = (struct SDL_PrivateAudioData *) |
2060 | 115 SDL_malloc(sizeof(*this->hidden)); |
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116 if (this->hidden == NULL) { |
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117 SDL_OutOfMemory(); |
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118 return 0; |
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119 } |
2060 | 120 SDL_memset(this->hidden, 0, sizeof(*this->hidden)); |
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121 |
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122 /* Open the audio device */ |
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123 this->hidden->output = SDL_RWFromFile(fname, "wb"); |
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124 if (this->hidden->output == NULL) { |
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125 DISKAUD_CloseDevice(this); |
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126 return 0; |
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127 } |
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128 |
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129 /* Allocate mixing buffer */ |
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130 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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131 if (this->hidden->mixbuf == NULL) { |
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132 DISKAUD_CloseDevice(this); |
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133 return 0; |
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134 } |
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135 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
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136 |
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137 this->hidden->mixlen = this->spec.size; |
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138 this->hidden->write_delay = |
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139 (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY; |
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140 |
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141 #if HAVE_STDIO_H |
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142 fprintf(stderr, |
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143 "WARNING: You are using the SDL disk writer audio driver!\n" |
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144 " Writing to file [%s].\n", fname); |
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145 #endif |
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146 |
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147 /* We're ready to rock and roll. :-) */ |
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148 return 1; |
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149 } |
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150 |
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151 static int |
2060 | 152 DISKAUD_Init(SDL_AudioDriverImpl * impl) |
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153 { |
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154 /* Set the function pointers */ |
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155 impl->OpenDevice = DISKAUD_OpenDevice; |
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156 impl->WaitDevice = DISKAUD_WaitDevice; |
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157 impl->PlayDevice = DISKAUD_PlayDevice; |
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158 impl->GetDeviceBuf = DISKAUD_GetDeviceBuf; |
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159 impl->CloseDevice = DISKAUD_CloseDevice; |
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160 |
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161 return 1; /* this audio target is available. */ |
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162 } |
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163 |
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164 AudioBootStrap DISKAUD_bootstrap = { |
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165 DISKAUD_DRIVER_NAME, "direct-to-disk audio", DISKAUD_Init, 1 |
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166 }; |
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167 |
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168 /* vi: set ts=4 sw=4 expandtab: */ |