src/audio/SDL_audiodev.c
author Aaron Wishnick <schnarf@gmail.com>
Tue, 12 Aug 2008 00:50:58 +0000
branchgsoc2008_audio_resampling
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parent 2258 771bd3389e3a
child 2859 99210400e8b9
permissions -rw-r--r--
Added streamer code. I haven't yet incorporated it into SDL_RunAudio() though.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.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 "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 inline void
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test_device(const char *fname, int flags, int (*test) (int fd),
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            char ***devices, int *devCount)
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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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        int audio_fd = open(fname, flags, 0);
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        if ((audio_fd >= 0) && (test(audio_fd))) {
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            void *p =
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                SDL_realloc(*devices, ((*devCount) + 1) * sizeof(char *));
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            if (p != NULL) {
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                size_t len = strlen(fname) + 1;
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                char *str = (char *) SDL_malloc(len);
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                *devices = (char **) p;
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                if (str != NULL) {
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                    SDL_strlcpy(str, fname, len);
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                    (*devices)[(*devCount)++] = str;
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                }
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            }
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            close(audio_fd);
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        }
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    }
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}
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void
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SDL_FreeUnixAudioDevices(char ***devices, int *devCount)
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{
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    int i = *devCount;
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    if ((i > 0) && (*devices != NULL)) {
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        while (i--) {
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            SDL_free((*devices)[i]);
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        }
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    }
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    if (*devices != NULL) {
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        SDL_free(*devices);
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    }
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    *devices = NULL;
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    *devCount = 0;
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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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void
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SDL_EnumUnixAudioDevices(int flags, int classic, int (*test) (int fd),
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                         char ***devices, int *devCount)
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{
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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(audiodev, flags, test, devices, devCount);
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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(audiopath, flags, test, devices, devCount);
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        }
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    }
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}
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#endif /* Audio driver selection */
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/* vi: set ts=4 sw=4 expandtab: */