Mercurial > sdl-ios-xcode

annotate src/audio/disk/SDL_diskaudio.c @ 5004:0c72ae7b7cb2

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Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics. Changed the CAS return value to bool, so it's efficient with OSAtomicCompareAndSwap32Barrier() Added an atomic test adapted from code by Michael Davidsaver
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 Jan 2011 15:16:39 -0800
parents 4160ba33b597
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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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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 *)
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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 }
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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
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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: */