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annotate src/audio/dummy/SDL_dummyaudio.c @ 1534:f02e673ffc5f

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*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 16:20:28 +0000
parents 38c1eb6b0083
children 60620d71e324
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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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
1533
38c1eb6b0083 By default all the real targets have dummy audio/video and disk audio.
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27 /* Output audio to nowhere... */
1532
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28
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29 #include "SDL_rwops.h"
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30 #include "SDL_timer.h"
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31 #include "SDL_audio.h"
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32 #include "../SDL_audiomem.h"
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33 #include "../SDL_audio_c.h"
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34 #include "../SDL_audiodev_c.h"
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35 #include "SDL_dummyaudio.h"
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36
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37 /* The tag name used by DUMMY audio */
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38 #define DUMMYAUD_DRIVER_NAME "dummy"
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39
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40 /* environment variables and defaults. */
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41 #define DUMMYENVR_WRITEDELAY "SDL_DUMMYAUDIODELAY"
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42 #define DUMMYDEFAULT_WRITEDELAY 150
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43
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44 /* Audio driver functions */
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45 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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46 static void DUMMYAUD_WaitAudio(_THIS);
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47 static void DUMMYAUD_PlayAudio(_THIS);
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48 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
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49 static void DUMMYAUD_CloseAudio(_THIS);
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50
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51 /* Audio driver bootstrap functions */
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52 static int DUMMYAUD_Available(void)
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53 {
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54 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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55 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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56 return(1);
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57 }
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58 return(0);
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59 }
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60
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61 static void DUMMYAUD_DeleteDevice(SDL_AudioDevice *device)
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62 {
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63 SDL_free(device->hidden);
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64 SDL_free(device);
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65 }
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66
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67 static SDL_AudioDevice *DUMMYAUD_CreateDevice(int devindex)
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68 {
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69 SDL_AudioDevice *this;
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70 const char *envr;
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71
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72 /* Initialize all variables that we clean on shutdown */
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73 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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74 if ( this ) {
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75 SDL_memset(this, 0, (sizeof *this));
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76 this->hidden = (struct SDL_PrivateAudioData *)
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77 SDL_malloc((sizeof *this->hidden));
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78 }
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79 if ( (this == NULL) || (this->hidden == NULL) ) {
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80 SDL_OutOfMemory();
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81 if ( this ) {
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82 SDL_free(this);
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83 }
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84 return(0);
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85 }
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86 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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87
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88 envr = SDL_getenv(DUMMYENVR_WRITEDELAY);
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89 this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DUMMYDEFAULT_WRITEDELAY;
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90
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91 /* Set the function pointers */
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92 this->OpenAudio = DUMMYAUD_OpenAudio;
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93 this->WaitAudio = DUMMYAUD_WaitAudio;
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94 this->PlayAudio = DUMMYAUD_PlayAudio;
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95 this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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96 this->CloseAudio = DUMMYAUD_CloseAudio;
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97
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98 this->free = DUMMYAUD_DeleteDevice;
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99
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100 return this;
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101 }
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102
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103 AudioBootStrap DUMMYAUD_bootstrap = {
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104 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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105 DUMMYAUD_Available, DUMMYAUD_CreateDevice
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106 };
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107
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108 /* This function waits until it is possible to write a full sound buffer */
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109 static void DUMMYAUD_WaitAudio(_THIS)
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110 {
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111 SDL_Delay(this->hidden->write_delay);
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112 }
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113
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114 static void DUMMYAUD_PlayAudio(_THIS)
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115 {
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116 /* no-op...this is a null driver. */
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117 }
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118
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119 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS)
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120 {
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121 return(this->hidden->mixbuf);
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122 }
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123
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124 static void DUMMYAUD_CloseAudio(_THIS)
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125 {
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126 if ( this->hidden->mixbuf != NULL ) {
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127 SDL_FreeAudioMem(this->hidden->mixbuf);
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128 this->hidden->mixbuf = NULL;
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129 }
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130 }
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131
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132 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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133 {
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134 /* Allocate mixing buffer */
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135 this->hidden->mixlen = spec->size;
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136 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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137 if ( this->hidden->mixbuf == NULL ) {
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138 return(-1);
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139 }
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140 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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141
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142 /* We're ready to rock and roll. :-) */
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143 return(0);
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144 }
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145