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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #ifndef _SDL_sysaudio_h
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29 #define _SDL_sysaudio_h
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30
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31 #include "SDL_mutex.h"
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32 #include "SDL_thread.h"
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33
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34 /* The SDL audio driver */
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35 typedef struct SDL_AudioDevice SDL_AudioDevice;
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36
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37 /* Define the SDL audio driver structure */
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38 #define _THIS SDL_AudioDevice *_this
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39 #ifndef _STATUS
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40 #define _STATUS SDL_status *status
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41 #endif
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42 struct SDL_AudioDevice {
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43 /* * * */
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44 /* The name of this audio driver */
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45 const char *name;
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46
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47 /* * * */
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48 /* The description of this audio driver */
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49 const char *desc;
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50
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51 /* * * */
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52 /* Public driver functions */
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53 int (*OpenAudio)(_THIS, SDL_AudioSpec *spec);
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54 void (*ThreadInit)(_THIS); /* Called by audio thread at start */
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55 void (*WaitAudio)(_THIS);
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56 void (*PlayAudio)(_THIS);
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57 Uint8 *(*GetAudioBuf)(_THIS);
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58 void (*WaitDone)(_THIS);
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59 void (*CloseAudio)(_THIS);
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60
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61 /* * * */
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62 /* Data common to all devices */
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63
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64 /* The current audio specification (shared with audio thread) */
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65 SDL_AudioSpec spec;
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66
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67 /* An audio conversion block for audio format emulation */
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68 SDL_AudioCVT convert;
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69
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70 /* Current state flags */
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71 int enabled;
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72 int paused;
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73 int opened;
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74
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75 /* Fake audio buffer for when the audio hardware is busy */
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76 Uint8 *fake_stream;
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77
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78 /* A semaphore for locking the mixing buffers */
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79 SDL_mutex *mixer_lock;
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80
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81 /* A thread to feed the audio device */
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82 SDL_Thread *thread;
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83 Uint32 threadid;
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84
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85 /* * * */
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86 /* Data private to this driver */
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87 struct SDL_PrivateAudioData *hidden;
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88
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89 /* * * */
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90 /* The function used to dispose of this structure */
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91 void (*free)(_THIS);
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92 };
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93 #undef _THIS
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94
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95 typedef struct AudioBootStrap {
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96 const char *name;
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97 const char *desc;
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98 int (*available)(void);
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99 SDL_AudioDevice *(*create)(int devindex);
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100 } AudioBootStrap;
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101
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102 #if defined(unix) && \
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103 !defined(linux) && !defined(__FreeBSD__) && !defined(__CYGWIN32__) \
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104 && !defined(__bsdi__)
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105 extern AudioBootStrap AUDIO_bootstrap;
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106 #endif
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107 #ifdef OSS_SUPPORT
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108 extern AudioBootStrap DSP_bootstrap;
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109 extern AudioBootStrap DMA_bootstrap;
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110 #endif
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111 #ifdef ALSA_SUPPORT
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112 extern AudioBootStrap ALSA_bootstrap;
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113 #endif
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114 #ifdef ARTSC_SUPPORT
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115 extern AudioBootStrap ARTSC_bootstrap;
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116 #endif
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117 #ifdef ESD_SUPPORT
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118 extern AudioBootStrap ESD_bootstrap;
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119 #endif
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120 #ifdef NAS_SUPPORT
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121 extern AudioBootStrap NAS_bootstrap;
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122 #endif
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123 #ifdef ENABLE_DIRECTX
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124 extern AudioBootStrap DSOUND_bootstrap;
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125 #endif
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126 #ifdef ENABLE_WINDIB
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127 extern AudioBootStrap WAVEOUT_bootstrap;
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128 #endif
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129 #ifdef __BEOS__
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130 extern AudioBootStrap BAUDIO_bootstrap;
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131 #endif
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132 #if defined(macintosh) || TARGET_API_MAC_CARBON
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133 extern AudioBootStrap SNDMGR_bootstrap;
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134 #endif
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135 #ifdef _AIX
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136 extern AudioBootStrap Paud_bootstrap;
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137 #endif
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138
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139 /* This is the current audio device */
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140 extern SDL_AudioDevice *current_audio;
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141
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142 #endif /* _SDL_sysaudio_h */
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