/* * dump current mixer settings * *   (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de> * */#include <stdio.h>#include <stdlib.h>#include <fcntl.h>#include <unistd.h>#include <errno.h>#include <sys/ioctl.h>#include <sys/soundcard.h>char *labels[] = SOUND_DEVICE_LABELS;char *names[]  = SOUND_DEVICE_NAMES;intdump_mixer(char *devname){    struct mixer_info info;    int               mix,i,devmask,recmask,recsrc,stereomask,volume;    if (-1 == (mix = open(devname,O_RDONLY)))	return -1;    printf("%s",devname);    if (-1 != ioctl(mix,SOUND_MIXER_INFO,&info))	printf(" = %s (%s)",info.id,info.name);    printf("\n");    if (-1 == ioctl(mix,MIXER_READ(SOUND_MIXER_DEVMASK),&devmask) ||	-1 == ioctl(mix,MIXER_READ(SOUND_MIXER_STEREODEVS),&stereomask) ||	-1 == ioctl(mix,MIXER_READ(SOUND_MIXER_RECMASK),&recmask) ||	-1 == ioctl(mix,MIXER_READ(SOUND_MIXER_RECSRC),&recsrc)) {	perror("mixer ioctl");	return -1;    }    for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {	if ((1<<i) & devmask) {	    if (-1 == ioctl(mix,MIXER_READ(i),&volume)) {		perror("mixer read volume");		return -1;	    }	    printf("  %-10s (%2d) :  %s  %s%s",		   names[i],i,		   (1<<i) & stereomask ? "stereo" : "mono  ",		   (1<<i) & recmask    ? "rec"    : "   ",		   (1<<i) & recsrc     ? "*"      : " ");	    if ((1<<i) & stereomask)		printf("  %d/%d\n",volume & 0xff,(volume >> 8) & 0xff);	    else		printf("  %d\n",volume & 0xff);	}    }    return 0;}intmain(int argc, char *argv[]){    char devname[32];    int i;    /* first mixer device.  If "mixer0" does'nt work, try "mixer" */    if (-1 == dump_mixer("/dev/mixer0"))	dump_mixer("/dev/mixer");    /* other more devices */    for (i = 1; i < 8; i++) {	sprintf(devname,"/dev/mixer%d",i);	dump_mixer(devname);    }    return 0;}