aboutsummaryrefslogtreecommitdiffstats
path: root/distrib/sdl-1.2.15/src/audio/SDL_audiodev.c
blob: 396156c7dba721f321fc5458be06287d59947350 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2012 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* Get the name of the audio device we use for output */

#if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO

#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "SDL_stdinc.h"
#include "SDL_audiodev_c.h"

#ifndef _PATH_DEV_DSP
#if defined(__NETBSD__) || defined(__OPENBSD__)
#define _PATH_DEV_DSP  "/dev/audio"
#else
#define _PATH_DEV_DSP  "/dev/dsp"
#endif
#endif
#ifndef _PATH_DEV_DSP24
#define _PATH_DEV_DSP24	"/dev/sound/dsp"
#endif
#ifndef _PATH_DEV_AUDIO
#define _PATH_DEV_AUDIO	"/dev/audio"
#endif


int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
{
	const char *audiodev;
	int audio_fd;
	char audiopath[1024];

	/* Figure out what our audio device is */
	if ( ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) &&
	     ((audiodev=SDL_getenv("AUDIODEV")) == NULL) ) {
		if ( classic ) {
			audiodev = _PATH_DEV_AUDIO;
		} else {
			struct stat sb;

			/* Added support for /dev/sound/\* in Linux 2.4 */
			if ( ((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode)) &&
				 ((stat(_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(sb.st_mode)) ) {
				audiodev = _PATH_DEV_DSP24;
			} else {
				audiodev = _PATH_DEV_DSP;
			}
		}
	}
	audio_fd = open(audiodev, flags, 0);

	/* If the first open fails, look for other devices */
	if ( (audio_fd < 0) && (SDL_strlen(audiodev) < (sizeof(audiopath)-3)) ) {
		int exists, instance;
		struct stat sb;

		instance = 1;
		do { /* Don't use errno ENOENT - it may not be thread-safe */
			SDL_snprintf(audiopath, SDL_arraysize(audiopath),
			             "%s%d", audiodev, instance++);
			exists = 0;
			if ( stat(audiopath, &sb) == 0 ) {
				exists = 1;
				audio_fd = open(audiopath, flags, 0); 
			}
		} while ( exists && (audio_fd < 0) );
		audiodev = audiopath;
	}
	if ( path != NULL ) {
		SDL_strlcpy(path, audiodev, maxlen);
		path[maxlen-1] = '\0';
	}
	return(audio_fd);
}

#elif SDL_AUDIO_DRIVER_PAUD

/* Get the name of the audio device we use for output */

#include <sys/types.h>
#include <sys/stat.h>

#include "SDL_stdinc.h"
#include "SDL_audiodev_c.h"

#ifndef _PATH_DEV_DSP
#define _PATH_DEV_DSP	"/dev/%caud%c/%c"
#endif

char devsettings[][3] =
{
    { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
    { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
    { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
    { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
    { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
    { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
    { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
    { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
    { '\0', '\0', '\0' }
};

static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
{
	const char *audiodev;
	int  audio_fd;

	/* Figure out what our audio device is */
	if ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) {
	    audiodev=SDL_getenv("AUDIODEV");
	}
	if ( audiodev == NULL ) {
	    return -1;
	}
	audio_fd = open(audiodev, flags, 0);
	if ( path != NULL ) {
		SDL_strlcpy(path, audiodev, maxlen);
		path[maxlen-1] = '\0';
	}
	return audio_fd;
}

int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
{
    struct stat sb;
    int         audio_fd;
    char        audiopath[1024];
    int         cycle;

    audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
    if ( audio_fd != -1 ) {
        return audio_fd;
    }

    cycle    = 0;
    while( devsettings[cycle][0] != '\0' ) {
        SDL_snprintf( audiopath, SDL_arraysize(audiopath),
                 _PATH_DEV_DSP,
                 devsettings[cycle][0],
                 devsettings[cycle][1],
                 devsettings[cycle][2]);

	if ( stat(audiopath, &sb) == 0 ) {
	    audio_fd = open(audiopath, flags, 0);
	    if ( audio_fd > 0 ) {
		if ( path != NULL ) {
		    SDL_strlcpy( path, audiopath, maxlen );
		}
	        return audio_fd;
	    }
	}
    }
    return -1;
}

#endif /* Audio driver selection */