cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_audiodev.c (3410B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
      4
      5  This software is provided 'as-is', without any express or implied
      6  warranty.  In no event will the authors be held liable for any damages
      7  arising from the use of this software.
      8
      9  Permission is granted to anyone to use this software for any purpose,
     10  including commercial applications, and to alter it and redistribute it
     11  freely, subject to the following restrictions:
     12
     13  1. The origin of this software must not be misrepresented; you must not
     14     claim that you wrote the original software. If you use this software
     15     in a product, an acknowledgment in the product documentation would be
     16     appreciated but is not required.
     17  2. Altered source versions must be plainly marked as such, and must not be
     18     misrepresented as being the original software.
     19  3. This notice may not be removed or altered from any source distribution.
     20*/
     21#include "../SDL_internal.h"
     22
     23/* Get the name of the audio device we use for output */
     24
     25#if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
     26
     27#include <fcntl.h>
     28#include <sys/types.h>
     29#include <sys/stat.h>
     30#include <unistd.h> /* For close() */
     31
     32#include "SDL_stdinc.h"
     33#include "SDL_audiodev_c.h"
     34
     35#ifndef _PATH_DEV_DSP
     36#if defined(__NETBSD__) || defined(__OPENBSD__)
     37#define _PATH_DEV_DSP  "/dev/audio"
     38#else
     39#define _PATH_DEV_DSP  "/dev/dsp"
     40#endif
     41#endif
     42#ifndef _PATH_DEV_DSP24
     43#define _PATH_DEV_DSP24 "/dev/sound/dsp"
     44#endif
     45#ifndef _PATH_DEV_AUDIO
     46#define _PATH_DEV_AUDIO "/dev/audio"
     47#endif
     48
     49static SDL_INLINE void
     50test_device(const char *fname, int flags, int (*test) (int fd),
     51            SDL_AddAudioDevice addfn)
     52{
     53    struct stat sb;
     54    if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
     55        const int audio_fd = open(fname, flags, 0);
     56        if (audio_fd >= 0) {
     57            if (test(audio_fd)) {
     58                addfn(fname);
     59            }
     60            close(audio_fd);
     61        }
     62    }
     63}
     64
     65static int
     66test_stub(int fd)
     67{
     68    return 1;
     69}
     70
     71void
     72SDL_EnumUnixAudioDevices(int iscapture, int classic, int (*test)(int fd),
     73                         SDL_AddAudioDevice addfn)
     74{
     75    const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
     76    const char *audiodev;
     77    char audiopath[1024];
     78
     79    if (test == NULL)
     80        test = test_stub;
     81
     82    /* Figure out what our audio device is */
     83    if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
     84        ((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
     85        if (classic) {
     86            audiodev = _PATH_DEV_AUDIO;
     87        } else {
     88            struct stat sb;
     89
     90            /* Added support for /dev/sound/\* in Linux 2.4 */
     91            if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
     92                && ((stat(_PATH_DEV_DSP24, &sb) == 0)
     93                    && S_ISCHR(sb.st_mode))) {
     94                audiodev = _PATH_DEV_DSP24;
     95            } else {
     96                audiodev = _PATH_DEV_DSP;
     97            }
     98        }
     99    }
    100    test_device(audiodev, flags, test, addfn);
    101
    102    if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
    103        int instance = 0;
    104        while (instance++ <= 64) {
    105            SDL_snprintf(audiopath, SDL_arraysize(audiopath),
    106                         "%s%d", audiodev, instance);
    107            test_device(audiopath, flags, test, addfn);
    108        }
    109    }
    110}
    111
    112#endif /* Audio driver selection */
    113/* vi: set ts=4 sw=4 expandtab: */