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Copy pathSDL_audiodev.c
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127 lines (109 loc) · 4.06 KB
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
// Get the name of the audio device we use for output
#if defined(SDL_AUDIO_DRIVER_NETBSD) || defined(SDL_AUDIO_DRIVER_OSS)
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h> // For close()
#include "SDL_audiodev_c.h"
#ifndef SDL_PATH_DEV_DSP
#if defined(SDL_PLATFORM_NETBSD) || defined(SDL_PLATFORM_OPENBSD)
#define SDL_PATH_DEV_DSP "/dev/audio"
#else
#define SDL_PATH_DEV_DSP "/dev/dsp"
#endif
#endif
#ifndef SDL_PATH_DEV_DSP24
#define SDL_PATH_DEV_DSP24 "/dev/sound/dsp"
#endif
#ifndef SDL_PATH_DEV_AUDIO
#define SDL_PATH_DEV_AUDIO "/dev/audio"
#endif
static void test_device(const SDL_bool iscapture, const char *fname, int flags, SDL_bool (*test)(int fd))
{
struct stat sb;
const int audio_fd = open(fname, flags | O_CLOEXEC, 0);
if (audio_fd >= 0) {
if ((fstat(audio_fd, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
const SDL_bool okay = test(audio_fd);
close(audio_fd);
if (okay) {
static size_t dummyhandle = 0;
dummyhandle++;
SDL_assert(dummyhandle != 0);
/* Note that spec is NULL; while we are opening the device
* endpoint here, the endpoint does not provide any mix format
* information, making this information inaccessible at
* enumeration time
*/
SDL_AddAudioDevice(iscapture, fname, NULL, (void *)(uintptr_t)dummyhandle);
}
} else {
close(audio_fd);
}
}
}
static SDL_bool test_stub(int fd)
{
return SDL_TRUE;
}
static void SDL_EnumUnixAudioDevices_Internal(const SDL_bool iscapture, const SDL_bool classic, SDL_bool (*test)(int))
{
const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT;
const char *audiodev;
char audiopath[1024];
if (!test) {
test = test_stub;
}
// Figure out what our audio device is
audiodev = SDL_getenv("SDL_PATH_DSP");
if (!audiodev) {
audiodev = SDL_getenv("AUDIODEV");
}
if (!audiodev) {
if (classic) {
audiodev = SDL_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(SDL_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(sb.st_mode))) {
audiodev = SDL_PATH_DEV_DSP24;
} else {
audiodev = SDL_PATH_DEV_DSP;
}
}
}
test_device(iscapture, audiodev, flags, test);
if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
int instance = 0;
while (instance <= 64) {
(void)SDL_snprintf(audiopath, SDL_arraysize(audiopath),
"%s%d", audiodev, instance);
instance++;
test_device(iscapture, audiopath, flags, test);
}
}
}
void SDL_EnumUnixAudioDevices(const SDL_bool classic, SDL_bool (*test)(int))
{
SDL_EnumUnixAudioDevices_Internal(SDL_TRUE, classic, test);
SDL_EnumUnixAudioDevices_Internal(SDL_FALSE, classic, test);
}
#endif // Audio device selection