src/audio/SDL_sysaudio.h
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FUNCTIONS
This source file includes following functions.
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_sysaudio.h,v 1.6.2.17 2001/03/21 17:19:56 hercules Exp $";
26 #endif
27
28 #ifndef _SDL_sysaudio_h
29 #define _SDL_sysaudio_h
30
31 #include "SDL_mutex.h"
32 #include "SDL_thread.h"
33
34 /* The SDL audio driver */
35 typedef struct SDL_AudioDevice SDL_AudioDevice;
36
37 /* Define the SDL audio driver structure */
38 #define _THIS SDL_AudioDevice *_this
39 #ifndef _STATUS
40 #define _STATUS SDL_status *status
41 #endif
42 struct SDL_AudioDevice {
43 /* * * */
44 /* The name of this audio driver */
45 const char *name;
46
47 /* * * */
48 /* The description of this audio driver */
49 const char *desc;
50
51 /* * * */
52 /* Public driver functions */
53 int (*OpenAudio)(_THIS, SDL_AudioSpec *spec);
54 void (*ThreadInit)(_THIS); /* Called by audio thread at start */
55 void (*WaitAudio)(_THIS);
56 void (*PlayAudio)(_THIS);
57 Uint8 *(*GetAudioBuf)(_THIS);
58 void (*WaitDone)(_THIS);
59 void (*CloseAudio)(_THIS);
60
61 /* * * */
62 /* Data common to all devices */
63
64 /* The current audio specification (shared with audio thread) */
65 SDL_AudioSpec spec;
66
67 /* An audio conversion block for audio format emulation */
68 SDL_AudioCVT convert;
69
70 /* Current state flags */
71 int enabled;
72 int paused;
73 int opened;
74
75 /* Fake audio buffer for when the audio hardware is busy */
76 Uint8 *fake_stream;
77
78 /* A semaphore for locking the mixing buffers */
79 SDL_mutex *mixer_lock;
80
81 /* A thread to feed the audio device */
82 SDL_Thread *thread;
83 Uint32 threadid;
84
85 /* * * */
86 /* Data private to this driver */
87 struct SDL_PrivateAudioData *hidden;
88
89 /* * * */
90 /* The function used to dispose of this structure */
91 void (*free)(_THIS);
92 };
93 #undef _THIS
94
95 typedef struct AudioBootStrap {
96 const char *name;
97 const char *desc;
98 int (*available)(void);
99 SDL_AudioDevice *(*create)(int devindex);
100 } AudioBootStrap;
101
102 #if defined(unix) && \
103 !defined(linux) && !defined(__FreeBSD__) && !defined(__CYGWIN32__) \
104 && !defined(__bsdi__)
105 extern AudioBootStrap AUDIO_bootstrap;
106 #endif
107 #ifdef OSS_SUPPORT
108 extern AudioBootStrap DSP_bootstrap;
109 extern AudioBootStrap DMA_bootstrap;
110 #endif
111 #ifdef ALSA_SUPPORT
112 extern AudioBootStrap ALSA_bootstrap;
113 #endif
114 #ifdef ARTSC_SUPPORT
115 extern AudioBootStrap ARTSC_bootstrap;
116 #endif
117 #ifdef ESD_SUPPORT
118 extern AudioBootStrap ESD_bootstrap;
119 #endif
120 #ifdef NAS_SUPPORT
121 extern AudioBootStrap NAS_bootstrap;
122 #endif
123 #ifdef ENABLE_DIRECTX
124 extern AudioBootStrap DSOUND_bootstrap;
125 #endif
126 #ifdef ENABLE_WINDIB
127 extern AudioBootStrap WAVEOUT_bootstrap;
128 #endif
129 #ifdef __BEOS__
130 extern AudioBootStrap BAUDIO_bootstrap;
131 #endif
132 #if defined(macintosh) || TARGET_API_MAC_CARBON
133 extern AudioBootStrap SNDMGR_bootstrap;
134 #endif
135 #ifdef _AIX
136 extern AudioBootStrap Paud_bootstrap;
137 #endif
138
139 /* This is the current audio device */
140 extern SDL_AudioDevice *current_audio;
141
142 #endif /* _SDL_sysaudio_h */