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annotate src/audio/dummy/SDL_dummyaudio.c @ 4311:1238da4a7112 SDL-1.2

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Debian patch: f230_manpages.diff
author Sam Lantinga <slouken@libsdl.org>
date Sat, 10 Oct 2009 10:09:01 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 audio to nowhere... */
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27
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28 #include "SDL_rwops.h"
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audiomem.h"
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32 #include "../SDL_audio_c.h"
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33 #include "../SDL_audiodev_c.h"
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34 #include "SDL_dummyaudio.h"
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35
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36 /* The tag name used by DUMMY audio */
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37 #define DUMMYAUD_DRIVER_NAME "dummy"
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38
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39 /* Audio driver functions */
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40 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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41 static void DUMMYAUD_WaitAudio(_THIS);
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42 static void DUMMYAUD_PlayAudio(_THIS);
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43 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
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44 static void DUMMYAUD_CloseAudio(_THIS);
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45
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46 /* Audio driver bootstrap functions */
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47 static int DUMMYAUD_Available(void)
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48 {
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49 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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50 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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51 return(1);
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52 }
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53 return(0);
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54 }
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55
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56 static void DUMMYAUD_DeleteDevice(SDL_AudioDevice *device)
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57 {
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58 SDL_free(device->hidden);
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59 SDL_free(device);
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60 }
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61
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62 static SDL_AudioDevice *DUMMYAUD_CreateDevice(int devindex)
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63 {
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64 SDL_AudioDevice *this;
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65
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66 /* Initialize all variables that we clean on shutdown */
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67 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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68 if ( this ) {
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69 SDL_memset(this, 0, (sizeof *this));
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70 this->hidden = (struct SDL_PrivateAudioData *)
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71 SDL_malloc((sizeof *this->hidden));
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72 }
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73 if ( (this == NULL) || (this->hidden == NULL) ) {
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74 SDL_OutOfMemory();
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75 if ( this ) {
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76 SDL_free(this);
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77 }
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78 return(0);
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79 }
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80 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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81
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82 /* Set the function pointers */
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83 this->OpenAudio = DUMMYAUD_OpenAudio;
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84 this->WaitAudio = DUMMYAUD_WaitAudio;
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85 this->PlayAudio = DUMMYAUD_PlayAudio;
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86 this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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87 this->CloseAudio = DUMMYAUD_CloseAudio;
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88
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89 this->free = DUMMYAUD_DeleteDevice;
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90
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91 return this;
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92 }
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93
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94 AudioBootStrap DUMMYAUD_bootstrap = {
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95 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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96 DUMMYAUD_Available, DUMMYAUD_CreateDevice
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97 };
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98
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99 /* This function waits until it is possible to write a full sound buffer */
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100 static void DUMMYAUD_WaitAudio(_THIS)
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101 {
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102 /* Don't block on first calls to simulate initial fragment filling. */
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103 if (this->hidden->initial_calls)
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104 this->hidden->initial_calls--;
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105 else
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106 SDL_Delay(this->hidden->write_delay);
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107 }
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108
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109 static void DUMMYAUD_PlayAudio(_THIS)
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110 {
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111 /* no-op...this is a null driver. */
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112 }
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113
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114 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS)
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115 {
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116 return(this->hidden->mixbuf);
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117 }
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118
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119 static void DUMMYAUD_CloseAudio(_THIS)
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120 {
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121 if ( this->hidden->mixbuf != NULL ) {
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122 SDL_FreeAudioMem(this->hidden->mixbuf);
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123 this->hidden->mixbuf = NULL;
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124 }
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125 }
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126
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127 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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128 {
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129 float bytes_per_sec = 0.0f;
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130
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131 /* Allocate mixing buffer */
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132 this->hidden->mixlen = spec->size;
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133 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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134 if ( this->hidden->mixbuf == NULL ) {
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135 return(-1);
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136 }
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137 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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138
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139 bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
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140 spec->channels * spec->freq);
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141
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142 /*
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143 * We try to make this request more audio at the correct rate for
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144 * a given audio spec, so timing stays fairly faithful.
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145 * Also, we have it not block at all for the first two calls, so
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146 * it seems like we're filling two audio fragments right out of the
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147 * gate, like other SDL drivers tend to do.
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148 */
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149 this->hidden->initial_calls = 2;
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150 this->hidden->write_delay =
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151 (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
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152
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153 /* We're ready to rock and roll. :-) */
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154 return(0);
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155 }
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156