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comparison src/audio/SDL_audiodev.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children ae6e6b73333f
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-1:000000000000 0:74212992fb08
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 "@(#) $Id$";
26 #endif
27
28 /* Get the name of the audio device we use for output */
29
30 #if defined(unix) || defined(__unix__)
31
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <fcntl.h>
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <string.h>
38
39 #include "SDL_audiodev_c.h"
40
41 #ifndef _PATH_DEV_DSP
42 #define _PATH_DEV_DSP "/dev/dsp"
43 #endif
44 #ifndef _PATH_DEV_DSP24
45 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
46 #endif
47 #ifndef _PATH_DEV_AUDIO
48 #define _PATH_DEV_AUDIO "/dev/audio"
49 #endif
50
51
52 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
53 {
54 const char *audiodev;
55 int audio_fd;
56 char audiopath[1024];
57
58 /* Figure out what our audio device is */
59 if ( ((audiodev=getenv("SDL_PATH_DSP")) == NULL) &&
60 ((audiodev=getenv("AUDIODEV")) == NULL) ) {
61 if ( classic ) {
62 audiodev = _PATH_DEV_AUDIO;
63 } else {
64 struct stat sb;
65
66 /* Added support for /dev/sound/\* in Linux 2.4 */
67 if ( (stat("/dev/sound", &sb) == 0) &&
68 S_ISDIR(sb.st_mode) ) {
69 audiodev = _PATH_DEV_DSP24;
70 } else {
71 audiodev = _PATH_DEV_DSP;
72 }
73 }
74 }
75 audio_fd = open(audiodev, flags, 0);
76
77 /* If the first open fails, look for other devices */
78 if ( (audio_fd < 0) && (strlen(audiodev) < (sizeof(audiopath)-3)) ) {
79 int exists, instance;
80 struct stat sb;
81
82 instance = 1;
83 do { /* Don't use errno ENOENT - it may not be thread-safe */
84 sprintf(audiopath, "%s%d", audiodev, instance++);
85 exists = 0;
86 if ( stat(audiopath, &sb) == 0 ) {
87 exists = 1;
88 audio_fd = open(audiopath, flags, 0);
89 }
90 } while ( exists && (audio_fd < 0) );
91 audiodev = audiopath;
92 }
93 if ( path != NULL ) {
94 strncpy(path, audiodev, maxlen);
95 path[maxlen-1] = '\0';
96 }
97 return(audio_fd);
98 }
99
100 #elif defined(_AIX)
101
102 /* Get the name of the audio device we use for output */
103
104 #include <stdlib.h>
105 #include <sys/types.h>
106 #include <sys/stat.h>
107 #include <string.h>
108
109 #include "SDL_audiodev_c.h"
110
111 #ifndef _PATH_DEV_DSP
112 #define _PATH_DEV_DSP "/dev/%caud%c/%c"
113 #endif
114
115 char devsettings[][3] =
116 {
117 { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
118 { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
119 { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
120 { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
121 { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
122 { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
123 { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
124 { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
125 { '\0', '\0', '\0' }
126 };
127
128 static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
129 {
130 const char *audiodev;
131 int audio_fd;
132
133 /* Figure out what our audio device is */
134 if ((audiodev=getenv("SDL_PATH_DSP")) == NULL) {
135 audiodev=getenv("AUDIODEV");
136 }
137 if ( audiodev == NULL ) {
138 return -1;
139 }
140 audio_fd = open(audiodev, flags, 0);
141 if ( path != NULL ) {
142 strncpy(path, audiodev, maxlen);
143 path[maxlen-1] = '\0';
144 }
145 return audio_fd;
146 }
147
148 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
149 {
150 struct stat sb;
151 int audio_fd;
152 char audiopath[1024];
153 int cycle;
154
155 audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
156 if ( audio_fd != -1 ) {
157 return audio_fd;
158 }
159
160 cycle = 0;
161 while( devsettings[cycle][0] != '\0' ) {
162 sprintf( audiopath,
163 _PATH_DEV_DSP,
164 devsettings[cycle][0],
165 devsettings[cycle][1],
166 devsettings[cycle][2]);
167
168 if ( stat(audiopath, &sb) == 0 ) {
169 audio_fd = open(audiopath, flags, 0);
170 if ( audio_fd > 0 ) {
171 if ( path != NULL ) {
172 strncpy( path, audiopath, maxlen );
173 path[maxlen-1] = '\0';
174 }
175 return audio_fd;
176 }
177 }
178 }
179 return -1;
180 }
181
182 #endif /* UNIX system */