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annotate src/audio/dummy/SDL_dummyaudio.c @ 1720:a1ebb17f9c52 SDL-1.3

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Cleaned up a bunch of warnings, started adding Win32 event support
author Sam Lantinga <slouken@libsdl.org>
date Fri, 30 Jun 2006 05:42:49 +0000
parents 4da1ee79c9af
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) 1997-2006 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 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
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48 DUMMYAUD_Available(void)
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49 {
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50 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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51 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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52 return (1);
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53 }
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54 return (0);
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55 }
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56
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57 static void
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58 DUMMYAUD_DeleteDevice(SDL_AudioDevice * device)
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59 {
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60 SDL_free(device->hidden);
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61 SDL_free(device);
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62 }
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63
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64 static SDL_AudioDevice *
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65 DUMMYAUD_CreateDevice(int devindex)
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66 {
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67 SDL_AudioDevice *this;
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68
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69 /* Initialize all variables that we clean on shutdown */
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70 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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71 if (this) {
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72 SDL_memset(this, 0, (sizeof *this));
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73 this->hidden = (struct SDL_PrivateAudioData *)
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74 SDL_malloc((sizeof *this->hidden));
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75 }
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76 if ((this == NULL) || (this->hidden == NULL)) {
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77 SDL_OutOfMemory();
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78 if (this) {
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79 SDL_free(this);
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80 }
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81 return (0);
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82 }
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83 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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84
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85 /* Set the function pointers */
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86 this->OpenAudio = DUMMYAUD_OpenAudio;
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87 this->WaitAudio = DUMMYAUD_WaitAudio;
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88 this->PlayAudio = DUMMYAUD_PlayAudio;
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89 this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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90 this->CloseAudio = DUMMYAUD_CloseAudio;
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91
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92 this->free = DUMMYAUD_DeleteDevice;
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93
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94 return this;
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95 }
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96
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97 AudioBootStrap DUMMYAUD_bootstrap = {
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98 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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99 DUMMYAUD_Available, DUMMYAUD_CreateDevice
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100 };
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101
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102 /* This function waits until it is possible to write a full sound buffer */
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103 static void
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104 DUMMYAUD_WaitAudio(_THIS)
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105 {
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106 /* Don't block on first calls to simulate initial fragment filling. */
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107 if (this->hidden->initial_calls)
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108 this->hidden->initial_calls--;
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109 else
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110 SDL_Delay(this->hidden->write_delay);
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111 }
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112
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113 static void
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114 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 *
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120 DUMMYAUD_GetAudioBuf(_THIS)
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121 {
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122 return (this->hidden->mixbuf);
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123 }
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124
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125 static void
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126 DUMMYAUD_CloseAudio(_THIS)
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127 {
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128 if (this->hidden->mixbuf != NULL) {
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129 SDL_FreeAudioMem(this->hidden->mixbuf);
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130 this->hidden->mixbuf = NULL;
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131 }
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132 }
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133
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134 static int
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135 DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
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136 {
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137 float bytes_per_sec = 0.0f;
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138
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139 /* Allocate mixing buffer */
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140 this->hidden->mixlen = spec->size;
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141 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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142 if (this->hidden->mixbuf == NULL) {
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143 return (-1);
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144 }
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145 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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146
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147 bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
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148 spec->channels * spec->freq);
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149
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150 /*
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151 * We try to make this request more audio at the correct rate for
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152 * a given audio spec, so timing stays fairly faithful.
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153 * Also, we have it not block at all for the first two calls, so
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154 * it seems like we're filling two audio fragments right out of the
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155 * gate, like other SDL drivers tend to do.
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156 */
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157 this->hidden->initial_calls = 2;
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158 this->hidden->write_delay =
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159 (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
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160
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161 /* We're ready to rock and roll. :-) */
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162 return (0);
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163 }
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164
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165 /* vi: set ts=4 sw=4 expandtab: */