src/audio/SDL_audiodev.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 26 May 2015 21:19:23 -0400
changeset 9649 d7762e30ba24
parent 9619 b94b6d0bff0f
child 9998 f67cf37e9cd4
permissions -rw-r--r--
Stack hint should look for 0, not -1, and not care about environment variables.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2015 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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            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: */