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--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401
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Sam Lantinga
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182
src/audio/SDL_audiodev.c
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182
src/audio/SDL_audiodev.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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License as published by the Free Software Foundation; either
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version 2 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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/* Get the name of the audio device we use for output */
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#if defined(unix) || defined(__unix__)
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#include <stdlib.h>
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#include <stdio.h>
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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 <string.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/dsp"
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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=getenv("SDL_PATH_DSP")) == NULL) &&
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((audiodev=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) &&
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S_ISDIR(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) && (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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sprintf(audiopath, "%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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strncpy(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 defined(_AIX)
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/* Get the name of the audio device we use for output */
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.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=getenv("SDL_PATH_DSP")) == NULL) {
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audiodev=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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strncpy(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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sprintf( 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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strncpy( path, audiopath, 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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}
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}
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return -1;
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}
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#endif /* UNIX system */
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