src/audio/SDL_audiodev.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 09 May 2006 08:52:54 +0000
changeset 1794 5605a9820134
parent 1567 12b6d331d82a
child 1662 782fd950bd46
child 1895 c121d94672cb
child 4159 a1b03ba2fcd0
permissions -rw-r--r--
Fixed bug #137 If SDL_OpenAudio() is passed zero for the desired format fields, the following environment variables will be used to fill them in: SDL_AUDIO_FREQUENCY SDL_AUDIO_FORMAT SDL_AUDIO_CHANNELS SDL_AUDIO_SAMPLES If an environment variable is not specified, it will be set to a reasonable default value.
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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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int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
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{
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	const char *audiodev;
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	int audio_fd;
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	char audiopath[1024];
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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) && 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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	audio_fd = open(audiodev, flags, 0);
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	/* If the first open fails, look for other devices */
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	if ( (audio_fd < 0) && (SDL_strlen(audiodev) < (sizeof(audiopath)-3)) ) {
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		int exists, instance;
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		struct stat sb;
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		instance = 1;
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		do { /* Don't use errno ENOENT - it may not be thread-safe */
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			SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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			             "%s%d", audiodev, instance++);
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			exists = 0;
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			if ( stat(audiopath, &sb) == 0 ) {
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				exists = 1;
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				audio_fd = open(audiopath, flags, 0); 
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			}
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		} while ( exists && (audio_fd < 0) );
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		audiodev = audiopath;
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	}
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	if ( path != NULL ) {
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		SDL_strlcpy(path, audiodev, maxlen);
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		path[maxlen-1] = '\0';
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	}
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	return(audio_fd);
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}
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#elif SDL_AUDIO_DRIVER_PAUD
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/* Get the name of the audio device we use for output */
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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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#define _PATH_DEV_DSP	"/dev/%caud%c/%c"
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#endif
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char devsettings[][3] =
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{
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    { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
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    { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
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    { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
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    { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
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    { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
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    { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
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    { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
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    { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
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    { '\0', '\0', '\0' }
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};
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static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
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{
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	const char *audiodev;
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	int  audio_fd;
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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");
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	}
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	if ( audiodev == NULL ) {
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	    return -1;
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	}
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	audio_fd = open(audiodev, flags, 0);
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	if ( path != NULL ) {
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		SDL_strlcpy(path, audiodev, maxlen);
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		path[maxlen-1] = '\0';
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	}
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	return audio_fd;
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}
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int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
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{
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    struct stat sb;
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    int         audio_fd;
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    char        audiopath[1024];
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    int         cycle;
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    audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
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    if ( audio_fd != -1 ) {
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        return audio_fd;
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    }
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    cycle    = 0;
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    while( devsettings[cycle][0] != '\0' ) {
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        SDL_snprintf( audiopath, SDL_arraysize(audiopath),
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                 _PATH_DEV_DSP,
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                 devsettings[cycle][0],
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                 devsettings[cycle][1],
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                 devsettings[cycle][2]);
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	if ( stat(audiopath, &sb) == 0 ) {
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	    audio_fd = open(audiopath, flags, 0);
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	    if ( audio_fd > 0 ) {
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		if ( path != NULL ) {
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		    SDL_strlcpy( path, audiopath, maxlen );
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		}
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	        return audio_fd;
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	    }
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	}
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    }
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    return -1;
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}
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#endif /* Audio driver selection */