zenilib: zenilib/jni/external/sdl/src/audio/SDL_audiodev.c Source File

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SDL_audiodev.c
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1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "SDL_config.h"
22
23 /* Get the name of the audio device we use for output */
24
25 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
26
27 #include <fcntl.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <unistd.h> /* For close() */
31
32 #include "SDL_stdinc.h"
33 #include "SDL_audiodev_c.h"
34
35 #ifndef _PATH_DEV_DSP
36 #if defined(__NETBSD__) || defined(__OPENBSD__)
37 #define _PATH_DEV_DSP "/dev/audio"
38 #else
39 #define _PATH_DEV_DSP "/dev/dsp"
40 #endif
41 #endif
42 #ifndef _PATH_DEV_DSP24
43 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
44 #endif
45 #ifndef _PATH_DEV_AUDIO
46 #define _PATH_DEV_AUDIO "/dev/audio"
47 #endif
48
49 static inline void
50 test_device(const char *fname, int flags, int (*test) (int fd),
51 SDL_AddAudioDevice addfn)
52 {
53 struct stat sb;
54 if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
55 const int audio_fd = open(fname, flags, 0);
56 if (audio_fd >= 0) {
57 if (test(audio_fd)) {
58 addfn(fname);
59 }
60 close(audio_fd);
61 }
62 }
63 }
64
65 static int
66 test_stub(int fd)
67 {
68 return 1;
69 }
70
71 void
72 SDL_EnumUnixAudioDevices(int iscapture, int classic, int (*test)(int fd),
73 SDL_AddAudioDevice addfn)
74 {
75 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
76 const char *audiodev;
77 char audiopath[1024];
78
79 if (test == NULL)
80 test = test_stub;
81
82 /* Figure out what our audio device is */
83 if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
84 ((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
85 if (classic) {
86 audiodev = _PATH_DEV_AUDIO;
87 } else {
88 struct stat sb;
89
90 /* Added support for /dev/sound/\* in Linux 2.4 */
91 if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
92 && ((stat(_PATH_DEV_DSP24, &sb) == 0)
93 && S_ISCHR(sb.st_mode))) {
94 audiodev = _PATH_DEV_DSP24;
95 } else {
96 audiodev = _PATH_DEV_DSP;
97 }
98 }
99 }
100 test_device(audiodev, flags, test, addfn);
101
102 if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
103 int instance = 0;
104 while (instance++ <= 64) {
105 SDL_snprintf(audiopath, SDL_arraysize(audiopath),
106 "%s%d", audiodev, instance);
107 test_device(audiopath, flags, test, addfn);
108 }
109 }
110 }
111
112 #endif /* Audio driver selection */
113 /* vi: set ts=4 sw=4 expandtab: */
OPEN_FLAGS_INPUT
#define OPEN_FLAGS_INPUT
Definition: SDL_audiodev_c.h:33
SDL_AddAudioDevice
void(* SDL_AddAudioDevice)(const char *name)
Definition: SDL_sysaudio.h:34
SDL_EnumUnixAudioDevices
void SDL_EnumUnixAudioDevices(int iscapture, int classic, int(*test)(int fd), SDL_AddAudioDevice addfn)
NULL
#define NULL
Definition: ftobjs.h:61
SDL_snprintf
DECLSPEC int SDLCALL SDL_snprintf(char *text, size_t maxlen, const char *fmt,...)
Definition: SDL_string.c:1277
SDL_audiodev_c.h
SDL_config.h
OPEN_FLAGS_OUTPUT
#define OPEN_FLAGS_OUTPUT
Definition: SDL_audiodev_c.h:32
SDL_strlen
DECLSPEC size_t SDLCALL SDL_strlen(const char *str)
Definition: SDL_string.c:389
SDL_arraysize
#define SDL_arraysize(array)
Definition: SDL_stdinc.h:83
flags
GLenum GLsizei GLsizei GLsizei GLsizei GLbitfield flags
Definition: glew.h:2767
SDL_getenv
DECLSPEC char *SDLCALL SDL_getenv(const char *name)
Definition: SDL_getenv.c:179
types.h