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annotate src/audio/dummy/SDL_dummyaudio.c @ 1537:60620d71e324

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Corrected dummy audio callback firing to be realistic, cleaned up tabs.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 14 Mar 2006 19:12:49 +0000
parents 38c1eb6b0083
children b1f8c14f0df5
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 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 const char *envr;
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66
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67 /* Initialize all variables that we clean on shutdown */
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68 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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69 if ( this ) {
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70 SDL_memset(this, 0, (sizeof *this));
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71 this->hidden = (struct SDL_PrivateAudioData *)
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72 SDL_malloc((sizeof *this->hidden));
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73 }
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74 if ( (this == NULL) || (this->hidden == NULL) ) {
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75 SDL_OutOfMemory();
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76 if ( this ) {
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77 SDL_free(this);
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78 }
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79 return(0);
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80 }
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81 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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82
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83 /* Set the function pointers */
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84 this->OpenAudio = DUMMYAUD_OpenAudio;
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85 this->WaitAudio = DUMMYAUD_WaitAudio;
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86 this->PlayAudio = DUMMYAUD_PlayAudio;
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87 this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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88 this->CloseAudio = DUMMYAUD_CloseAudio;
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89
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90 this->free = DUMMYAUD_DeleteDevice;
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91
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92 return this;
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93 }
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94
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95 AudioBootStrap DUMMYAUD_bootstrap = {
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96 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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97 DUMMYAUD_Available, DUMMYAUD_CreateDevice
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98 };
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99
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100 /* This function waits until it is possible to write a full sound buffer */
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101 static void DUMMYAUD_WaitAudio(_THIS)
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102 {
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103 /* Don't block on first calls to simulate initial fragment filling. */
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104 if (this->hidden->initial_calls)
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105 this->hidden->initial_calls--;
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106 else
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107 SDL_Delay(this->hidden->write_delay);
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108 }
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109
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110 static void DUMMYAUD_PlayAudio(_THIS)
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111 {
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112 /* no-op...this is a null driver. */
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113 }
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114
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115 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS)
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116 {
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117 return(this->hidden->mixbuf);
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118 }
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119
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120 static void DUMMYAUD_CloseAudio(_THIS)
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121 {
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122 if ( this->hidden->mixbuf != NULL ) {
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123 SDL_FreeAudioMem(this->hidden->mixbuf);
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124 this->hidden->mixbuf = NULL;
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125 }
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126 }
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127
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128 static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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129 {
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130 float bytes_per_sec = 0.0f;
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131
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132 /* Allocate mixing buffer */
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133 this->hidden->mixlen = spec->size;
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134 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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135 if ( this->hidden->mixbuf == NULL ) {
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136 return(-1);
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137 }
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138 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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139
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140 bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
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141 spec->channels * spec->freq);
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142
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143 /*
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144 * We try to make this request more audio at the correct rate for
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145 * a given audio spec, so timing stays fairly faithful.
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146 * Also, we have it not block at all for the first two calls, so
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147 * it seems like we're filling two audio fragments right out of the
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148 * gate, like other SDL drivers tend to do.
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149 */
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150 this->hidden->initial_calls = 2;
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151 this->hidden->write_delay =
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152 (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
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153
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154 /* We're ready to rock and roll. :-) */
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155 return(0);
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30f189cdd82b Implemented dummy audio driver.
Ryan C. Gordon <icculus@icculus.org>
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