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SDL_audiodev.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Get the name of the audio device we use for output */
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#if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
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#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include "SDL_stdinc.h"
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#include "SDL_audiodev_c.h"
#ifndef _PATH_DEV_DSP
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#if defined(__NETBSD__) || defined(__OPENBSD__)
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#define _PATH_DEV_DSP "/dev/audio"
#else
#define _PATH_DEV_DSP "/dev/dsp"
#endif
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#endif
#ifndef _PATH_DEV_DSP24
#define _PATH_DEV_DSP24 "/dev/sound/dsp"
#endif
#ifndef _PATH_DEV_AUDIO
#define _PATH_DEV_AUDIO "/dev/audio"
#endif
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static inline void
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test_device(const char *fname, int flags, int (*test) (int fd),
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char ***devices, int *devCount)
{
struct stat sb;
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if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
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int audio_fd = open(fname, flags, 0);
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if ((audio_fd >= 0) && (test(audio_fd))) {
void *p =
SDL_realloc(*devices, ((*devCount) + 1) * sizeof(char *));
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if (p != NULL) {
size_t len = strlen(fname) + 1;
char *str = (char *) SDL_malloc(len);
*devices = (char **) p;
if (str != NULL) {
SDL_strlcpy(str, fname, len);
(*devices)[(*devCount)++] = str;
}
}
close(audio_fd);
}
}
}
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void
SDL_FreeUnixAudioDevices(char ***devices, int *devCount)
{
int i = *devCount;
if ((i > 0) && (*devices != NULL)) {
while (i--) {
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SDL_free((*devices)[i]);
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}
}
if (*devices != NULL) {
SDL_free(*devices);
}
*devices = NULL;
*devCount = 0;
}
static int
test_stub(int fd)
{
return 1;
}
void
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SDL_EnumUnixAudioDevices(int flags, int classic, int (*test) (int fd),
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char ***devices, int *devCount)
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{
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const char *audiodev;
char audiopath[1024];
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if (test == NULL)
test = test_stub;
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/* 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;
}
}
}
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test_device(audiodev, flags, test, devices, devCount);
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if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
int instance = 0;
while (instance++ <= 64) {
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SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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"%s%d", audiodev, instance);
test_device(audiopath, flags, test, devices, devCount);
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}
}
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#endif /* Audio driver selection */
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/* vi: set ts=4 sw=4 expandtab: */