mirror of https://github.com/encounter/SDL.git
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* Get the name of the audio device we use for output */
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#if SDL_AUDIO_DRIVER_NETBSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h> /* For close() */
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#include "SDL_stdinc.h"
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#include "SDL_audiodev_c.h"
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#ifndef _PATH_DEV_DSP
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#if defined(__NETBSD__) || defined(__OPENBSD__)
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#define _PATH_DEV_DSP "/dev/audio"
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#else
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#define _PATH_DEV_DSP "/dev/dsp"
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#endif
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#endif
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#ifndef _PATH_DEV_DSP24
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#define _PATH_DEV_DSP24 "/dev/sound/dsp"
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#endif
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#ifndef _PATH_DEV_AUDIO
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#define _PATH_DEV_AUDIO "/dev/audio"
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#endif
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static void
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test_device(const int iscapture, const char *fname, int flags, int (*test) (int fd))
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{
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struct stat sb;
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if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
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const int audio_fd = open(fname, flags | O_CLOEXEC, 0);
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if (audio_fd >= 0) {
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const int okay = test(audio_fd);
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close(audio_fd);
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if (okay) {
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static size_t dummyhandle = 0;
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dummyhandle++;
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SDL_assert(dummyhandle != 0);
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/* Note that spec is NULL; while we are opening the device
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* endpoint here, the endpoint does not provide any mix format
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* information, making this information inaccessible at
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* enumeration time
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*/
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SDL_AddAudioDevice(iscapture, fname, NULL, (void *) (uintptr_t) dummyhandle);
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}
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}
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}
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}
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static int
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test_stub(int fd)
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{
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return 1;
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}
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static void
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SDL_EnumUnixAudioDevices_Internal(const int iscapture, const int classic, int (*test)(int))
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{
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const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT;
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const char *audiodev;
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char audiopath[1024];
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if (test == NULL)
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test = test_stub;
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/* Figure out what our audio device is */
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if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
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((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
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if (classic) {
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audiodev = _PATH_DEV_AUDIO;
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} else {
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struct stat sb;
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/* Added support for /dev/sound/\* in Linux 2.4 */
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if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
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&& ((stat(_PATH_DEV_DSP24, &sb) == 0)
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&& S_ISCHR(sb.st_mode))) {
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audiodev = _PATH_DEV_DSP24;
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} else {
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audiodev = _PATH_DEV_DSP;
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}
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}
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}
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test_device(iscapture, audiodev, flags, test);
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if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
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int instance = 0;
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while (instance <= 64) {
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SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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"%s%d", audiodev, instance);
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instance++;
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test_device(iscapture, audiopath, flags, test);
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}
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}
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}
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void
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SDL_EnumUnixAudioDevices(const int classic, int (*test)(int))
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{
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SDL_EnumUnixAudioDevices_Internal(SDL_TRUE, classic, test);
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SDL_EnumUnixAudioDevices_Internal(SDL_FALSE, classic, test);
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}
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#endif /* Audio driver selection */
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/* vi: set ts=4 sw=4 expandtab: */
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