diff options
Diffstat (limited to 'Source/external/SDL2/src/audio/SDL_audiodev.c')
| -rw-r--r-- | Source/external/SDL2/src/audio/SDL_audiodev.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/audio/SDL_audiodev.c b/Source/external/SDL2/src/audio/SDL_audiodev.c new file mode 100644 index 0000000..d0b94a0 --- /dev/null +++ b/Source/external/SDL2/src/audio/SDL_audiodev.c @@ -0,0 +1,124 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 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 SDL_AUDIO_DRIVER_NETBSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO + +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> /* For close() */ + +#include "SDL_stdinc.h" +#include "SDL_audiodev_c.h" + +#ifndef _PATH_DEV_DSP +#if defined(__NETBSD__) || defined(__OPENBSD__) +#define _PATH_DEV_DSP "/dev/audio" +#else +#define _PATH_DEV_DSP "/dev/dsp" +#endif +#endif +#ifndef _PATH_DEV_DSP24 +#define _PATH_DEV_DSP24 "/dev/sound/dsp" +#endif +#ifndef _PATH_DEV_AUDIO +#define _PATH_DEV_AUDIO "/dev/audio" +#endif + +static void +test_device(const int iscapture, const char *fname, int flags, int (*test) (int fd)) +{ + struct stat sb; + if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) { + const int audio_fd = open(fname, flags, 0); + if (audio_fd >= 0) { + const int okay = test(audio_fd); + close(audio_fd); + if (okay) { + static size_t dummyhandle = 0; + dummyhandle++; + SDL_assert(dummyhandle != 0); + SDL_AddAudioDevice(iscapture, fname, (void *) dummyhandle); + } + } + } +} + +static int +test_stub(int fd) +{ + return 1; +} + +static void +SDL_EnumUnixAudioDevices_Internal(const int iscapture, const int classic, int (*test)(int)) +{ + const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT; + const char *audiodev; + char audiopath[1024]; + + if (test == NULL) + test = test_stub; + + /* 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; + } + } + } + test_device(iscapture, audiodev, flags, test); + + if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) { + int instance = 0; + while (instance <= 64) { + SDL_snprintf(audiopath, SDL_arraysize(audiopath), + "%s%d", audiodev, instance); + instance++; + test_device(iscapture, audiopath, flags, test); + } + } +} + +void +SDL_EnumUnixAudioDevices(const int classic, int (*test)(int)) +{ + SDL_EnumUnixAudioDevices_Internal(SDL_TRUE, classic, test); + SDL_EnumUnixAudioDevices_Internal(SDL_FALSE, classic, test); +} + +#endif /* Audio driver selection */ + +/* vi: set ts=4 sw=4 expandtab: */ |