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annotate src/audio/dummy/SDL_dummyaudio.c @ 3788:7006b176ef4f SDL-ryan-multiple-audio-device

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More work on the 1.3 CoreAudio code.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 03 Oct 2006 18:32:34 +0000
parents 37c9c4590689
children 866c310e2cb5
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, const char *devname, int iscapture);
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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 /* !!! FIXME: check this at a higher level... */
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51 /* only ever use this driver if explicitly requested. */
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52 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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53 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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54 return (1);
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55 }
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56 return (0);
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57 }
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58
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59 static int
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60 DUMMYAUD_Init(SDL_AudioDriverImpl *impl)
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61 {
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62 /* Set the function pointers */
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63 impl->OpenAudio = DUMMYAUD_OpenAudio;
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64 impl->WaitAudio = DUMMYAUD_WaitAudio;
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65 impl->PlayAudio = DUMMYAUD_PlayAudio;
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66 impl->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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67 impl->CloseAudio = DUMMYAUD_CloseAudio;
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68
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69 return 1;
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70 }
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71
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72 AudioBootStrap DUMMYAUD_bootstrap = {
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73 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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74 DUMMYAUD_Available, DUMMYAUD_Init
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75 };
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76
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77 /* This function waits until it is possible to write a full sound buffer */
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78 static void
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79 DUMMYAUD_WaitAudio(_THIS)
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80 {
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81 /* Don't block on first calls to simulate initial fragment filling. */
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82 if (this->hidden->initial_calls)
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83 this->hidden->initial_calls--;
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84 else
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85 SDL_Delay(this->hidden->write_delay);
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86 }
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87
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88 static void
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89 DUMMYAUD_PlayAudio(_THIS)
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90 {
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91 /* no-op...this is a null driver. */
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92 }
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93
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94 static Uint8 *
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95 DUMMYAUD_GetAudioBuf(_THIS)
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96 {
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97 return (this->hidden->mixbuf);
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98 }
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99
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100 static void
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101 DUMMYAUD_CloseAudio(_THIS)
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102 {
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103 if (this->hidden->mixbuf != NULL) {
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104 SDL_FreeAudioMem(this->hidden->mixbuf);
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105 this->hidden->mixbuf = NULL;
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106 }
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107 SDL_free(this->hidden);
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108 this->hidden = NULL;
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109 }
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110
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111 static int
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112 DUMMYAUD_OpenAudio(_THIS, const char *devname, int iscapture)
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113 {
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114 float bytes_per_sec = 0.0f;
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115
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116 /* Initialize all variables that we clean on shutdown */
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117 this->hidden = (struct SDL_PrivateAudioData *)
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118 SDL_malloc((sizeof *this->hidden));
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119 if (this->hidden == NULL) {
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120 SDL_OutOfMemory();
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121 return 0;
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122 }
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123 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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124
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125 /* Allocate mixing buffer */
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126 this->hidden->mixlen = this->spec.size;
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127 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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128 if (this->hidden->mixbuf == NULL) {
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129 DUMMYAUD_CloseAudio(this);
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130 return 0;
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131 }
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132 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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133
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134 bytes_per_sec = (float) (SDL_AUDIO_BITSIZE(this->spec.format) / 8) *
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135 this->spec.channels * this->spec.freq;
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136
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137 /*
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138 * We try to make this request more audio at the correct rate for
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139 * a given audio spec, so timing stays fairly faithful.
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140 * Also, we have it not block at all for the first two calls, so
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141 * it seems like we're filling two audio fragments right out of the
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142 * gate, like other SDL drivers tend to do.
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143 */
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144 this->hidden->initial_calls = 2;
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145 this->hidden->write_delay =
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146 (Uint32) ((((float) this->spec.size) / bytes_per_sec) * 1000.0f);
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147
1895
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148 /* We're ready to rock and roll. :-) */
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149 return 1;
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150 }
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151
1895
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152 /* vi: set ts=4 sw=4 expandtab: */