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annotate src/audio/dummy/SDL_dummyaudio.c @ 1532:30f189cdd82b

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Implemented dummy audio driver. Fixes Bugzilla #161.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 14 Mar 2006 08:53:33 +0000
parents
children 38c1eb6b0083
rev   line source
1532
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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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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 hacked^H^H^H^H^H^Hwritten by Ryan C. Gordon
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23 (icculus@icculus.org)
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24 */
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25 #include "SDL_config.h"
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26
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27 /* Output raw audio data to a file. */
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28
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29 #if HAVE_STDIO_H
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30 #include <stdio.h>
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31 #endif
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32
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33 #include "SDL_rwops.h"
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34 #include "SDL_timer.h"
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35 #include "SDL_audio.h"
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36 #include "../SDL_audiomem.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_audiodev_c.h"
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39 #include "SDL_dummyaudio.h"
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40
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41 /* The tag name used by DUMMY audio */
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42 #define DUMMYAUD_DRIVER_NAME "dummy"
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43
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44 /* environment variables and defaults. */
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45 #define DUMMYENVR_WRITEDELAY "SDL_DUMMYAUDIODELAY"
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46 #define DUMMYDEFAULT_WRITEDELAY 150
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47
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48 /* Audio driver functions */
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49 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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50 static void DUMMYAUD_WaitAudio(_THIS);
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51 static void DUMMYAUD_PlayAudio(_THIS);
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52 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
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53 static void DUMMYAUD_CloseAudio(_THIS);
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54
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55 /* Audio driver bootstrap functions */
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56 static int DUMMYAUD_Available(void)
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57 {
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58 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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59 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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60 return(1);
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61 }
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62 return(0);
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63 }
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64
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65 static void DUMMYAUD_DeleteDevice(SDL_AudioDevice *device)
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66 {
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67 SDL_free(device->hidden);
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68 SDL_free(device);
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69 }
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70
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71 static SDL_AudioDevice *DUMMYAUD_CreateDevice(int devindex)
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72 {
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73 SDL_AudioDevice *this;
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74 const char *envr;
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75
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76 /* Initialize all variables that we clean on shutdown */
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77 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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78 if ( this ) {
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79 SDL_memset(this, 0, (sizeof *this));
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80 this->hidden = (struct SDL_PrivateAudioData *)
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81 SDL_malloc((sizeof *this->hidden));
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82 }
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83 if ( (this == NULL) || (this->hidden == NULL) ) {
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84 SDL_OutOfMemory();
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85 if ( this ) {
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86 SDL_free(this);
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87 }
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88 return(0);
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89 }
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90 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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91
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92 envr = SDL_getenv(DUMMYENVR_WRITEDELAY);
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93 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DUMMYDEFAULT_WRITEDELAY;
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94
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95 /* Set the function pointers */
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96 this->OpenAudio = DUMMYAUD_OpenAudio;
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97 this->WaitAudio = DUMMYAUD_WaitAudio;
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98 this->PlayAudio = DUMMYAUD_PlayAudio;
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99 this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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100 this->CloseAudio = DUMMYAUD_CloseAudio;
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101
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102 this->free = DUMMYAUD_DeleteDevice;
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103
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104 return this;
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105 }
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106
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107 AudioBootStrap DUMMYAUD_bootstrap = {
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108 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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109 DUMMYAUD_Available, DUMMYAUD_CreateDevice
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110 };
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111
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112 /* This function waits until it is possible to write a full sound buffer */
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113 static void DUMMYAUD_WaitAudio(_THIS)
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114 {
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115 SDL_Delay(this->hidden->write_delay);
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116 }
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117
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118 static void DUMMYAUD_PlayAudio(_THIS)
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119 {
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120 /* no-op...this is a null driver. */
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121 }
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122
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123 static Uint8 *DUMMYAUD_GetAudioBuf(_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 DUMMYAUD_CloseAudio(_THIS)
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129 {
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130 if ( this->hidden->mixbuf != NULL ) {
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131 SDL_FreeAudioMem(this->hidden->mixbuf);
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132 this->hidden->mixbuf = NULL;
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133 }
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134 }
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135
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136 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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137 {
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138 #if HAVE_STDIO_H
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139 fprintf(stderr, "\nWARNING: You are using the SDL dummy audio driver!"
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140 " No sound will be output!\n\n");
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141 #endif
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142
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143 /* Allocate mixing buffer */
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144 this->hidden->mixlen = spec->size;
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145 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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146 if ( this->hidden->mixbuf == NULL ) {
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147 return(-1);
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148 }
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149 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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150
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151 /* We're ready to rock and roll. :-) */
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152 return(0);
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153 }
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154