/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* Get the name of the audio device we use for output */

#include <stdlib.h>

#include <stdio.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <string.h>

#include "SDL_audiodev_c.h"

#ifndef _PATH_DEV_DSP

#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

int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)

{

const char *audiodev;

int audio_fd;

char audiopath[1024];

/* Figure out what our audio device is */

if ( ((audiodev=getenv("SDL_PATH_DSP")) == NULL) &&

((audiodev=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) ) {

audiodev = _PATH_DEV_DSP24;

} else {

audiodev = _PATH_DEV_DSP;

}

}

}

audio_fd = open(audiodev, flags, 0);

/* If the first open fails, look for other devices */

if ( (audio_fd < 0) && (strlen(audiodev) < (sizeof(audiopath)-3)) ) {

int exists, instance;

struct stat sb;

instance = 1;

do { /* Don't use errno ENOENT - it may not be thread-safe */

sprintf(audiopath, "%s%d", audiodev, instance++);

exists = 0;

if ( stat(audiopath, &sb) == 0 ) {

exists = 1;

audio_fd = open(audiopath, flags, 0);

}

} while ( exists && (audio_fd < 0) );

audiodev = audiopath;

}

if ( path != NULL ) {

strncpy(path, audiodev, maxlen);

path[maxlen-1] = '\0';

}

return(audio_fd);

}

#elif defined(_AIX)

/* Get the name of the audio device we use for output */

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <string.h>

#include "SDL_audiodev_c.h"

#ifndef _PATH_DEV_DSP

#define _PATH_DEV_DSP "/dev/%caud%c/%c"

#endif

char devsettings[][3] =

{

{ 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },

{ 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },

{ 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },

{ 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },

{ 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },

{ 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },

{ 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },

{ 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },

{ '\0', '\0', '\0' }

};

static int OpenUserDefinedDevice(char *path, int maxlen, int flags)

{

const char *audiodev;

int audio_fd;

/* Figure out what our audio device is */

if ((audiodev=getenv("SDL_PATH_DSP")) == NULL) {

audiodev=getenv("AUDIODEV");

}

if ( audiodev == NULL ) {

return -1;

}

audio_fd = open(audiodev, flags, 0);

if ( path != NULL ) {

strncpy(path, audiodev, maxlen);

path[maxlen-1] = '\0';

}

return audio_fd;

}

int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)

{

struct stat sb;

int audio_fd;

char audiopath[1024];

int cycle;

audio_fd = OpenUserDefinedDevice(path,maxlen,flags);

if ( audio_fd != -1 ) {

return audio_fd;

}

cycle = 0;

while( devsettings[cycle][0] != '\0' ) {

sprintf( audiopath,

_PATH_DEV_DSP,

devsettings[cycle][0],

devsettings[cycle][1],

devsettings[cycle][2]);

if ( stat(audiopath, &sb) == 0 ) {

audio_fd = open(audiopath, flags, 0);

if ( audio_fd > 0 ) {

if ( path != NULL ) {

strncpy( path, audiopath, maxlen );

path[maxlen-1] = '\0';

}

return audio_fd;

}

}

}

return -1;

}

#endif /* UNIX system */