/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

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

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 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

    Lesser General Public License for more details.

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

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

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

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

#if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include "SDL_stdinc.h"

#include "SDL_audiodev_c.h"

#ifndef _PATH_DEV_DSP

#if defined(__NETBSD__) || defined(__OPENBSD__)

#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=SDL_getenv("SDL_PATH_DSP")) == NULL) &&

	     ((audiodev=SDL_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)) &&

				 ((stat(_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(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) && (SDL_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 */

			SDL_snprintf(audiopath, SDL_arraysize(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 ) {

		SDL_strlcpy(path, audiodev, maxlen);

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

	}

	return(audio_fd);

}

#elif SDL_AUDIO_DRIVER_PAUD

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

#include <sys/types.h>

#include <sys/stat.h>

#include "SDL_stdinc.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=SDL_getenv("SDL_PATH_DSP")) == NULL) {

	    audiodev=SDL_getenv("AUDIODEV");

	}

	if ( audiodev == NULL ) {

	    return -1;

	}

	audio_fd = open(audiodev, flags, 0);

	if ( path != NULL ) {

		SDL_strlcpy(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' ) {

        SDL_snprintf( audiopath, SDL_arraysize(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 ) {

		    SDL_strlcpy( path, audiopath, maxlen );

		}

	        return audio_fd;

	    }

	}

    }

    return -1;

}

#endif /* Audio driver selection */