Atlas - SDL_audiodev.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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_internal.h"
22
23/* Get the name of the audio device we use for output */
24
25#if SDL_AUDIO_DRIVER_NETBSD || 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
49static void
50test_device(const int iscapture, const char *fname, int flags, int (*test) (int fd))
51{
52    struct stat sb;
53    if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
54        const int audio_fd = open(fname, flags, 0);
55        if (audio_fd >= 0) {
56            const int okay = test(audio_fd);
57            close(audio_fd);
58            if (okay) {
59                static size_t dummyhandle = 0;
60                dummyhandle++;
61                SDL_assert(dummyhandle != 0);
62                SDL_AddAudioDevice(iscapture, fname, (void *) dummyhandle);
63            }
64        }
65    }
66}
67
68static int
69test_stub(int fd)
70{
71    return 1;
72}
73
74static void
75SDL_EnumUnixAudioDevices_Internal(const int iscapture, const int classic, int (*test)(int))
76{
77    const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT;
78    const char *audiodev;
79    char audiopath[1024];
80
81    if (test == NULL)
82        test = test_stub;
83
84    /* Figure out what our audio device is */
85    if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
86        ((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
87        if (classic) {
88            audiodev = _PATH_DEV_AUDIO;
89        } else {
90            struct stat sb;
91
92            /* Added support for /dev/sound/\* in Linux 2.4 */
93            if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
94                && ((stat(_PATH_DEV_DSP24, &sb) == 0)
95                    && S_ISCHR(sb.st_mode))) {
96                audiodev = _PATH_DEV_DSP24;
97            } else {
98                audiodev = _PATH_DEV_DSP;
99            }
100        }
101    }
102    test_device(iscapture, audiodev, flags, test);
103
104    if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
105        int instance = 0;
106        while (instance <= 64) {
107            SDL_snprintf(audiopath, SDL_arraysize(audiopath),
108                         "%s%d", audiodev, instance);
109            instance++;
110            test_device(iscapture, audiopath, flags, test);
111        }
112    }
113}
114
115void
116SDL_EnumUnixAudioDevices(const int classic, int (*test)(int))
117{
118    SDL_EnumUnixAudioDevices_Internal(SDL_TRUE, classic, test);
119    SDL_EnumUnixAudioDevices_Internal(SDL_FALSE, classic, test);
120}
121
122#endif /* Audio driver selection */
123
124/* vi: set ts=4 sw=4 expandtab: */
125
[FILE END]
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