src/audio/SDL_audiodev.c
author Sam Lantinga
Mon, 09 Jan 2017 11:58:01 -0800
changeset 10802 6afc9b833867
parent 10737 3406a0f8b041
child 11028 25cd7fe50180
permissions -rw-r--r--
We only need the first few keymaps corresponding to the following constants:
K_NORMTAB, K_SHIFTTAB, K_ALTTAB, K_ALTSHIFTTAB

In the normal case we'll load all the keymaps from the kernel, but this reduces the size of the SDL library for the fallback case when we can't get to the tty.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2017 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_BSD || 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, 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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                SDL_AddAudioDevice(iscapture, fname, (void *) 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: */