Mercurial > sdl-ios-xcode
annotate src/audio/dummy/SDL_dummyaudio.c @ 3788:7006b176ef4f SDL-ryan-multiple-audio-device
More work on the 1.3 CoreAudio code.
author | Ryan C. Gordon <icculus@icculus.org> |
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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 |
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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 |
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152 /* vi: set ts=4 sw=4 expandtab: */ |