#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include <sys/types.h>
#include <sys/stat.h>

void usage()
{
  printf("cmixer: vol|pcm digit\n");
}

int get_value(int val)
{
  if(val > 100){
	val = 100;
  }
  return ((val&0xff)<<8)|(val&0xff);
}

int main(int argc, char **argv)
{
  int mix;
  int vol;
  int stats = -1;
  mix = open("/dev/mixer", O_WRONLY);
  if (argc == 1){
	usage();
	ioctl(mix, MIXER_READ(SOUND_MIXER_VOLUME), &vol);
	printf("vol %d:%d\n", vol&0xff, (vol&0xff00)>>8);
	ioctl(mix, MIXER_READ(SOUND_MIXER_PCM), &vol);
	printf("pcm %d:%d\n", vol&0xff, (vol&0xff00)>>8);
	stats = 0;
  }else if (argc > 2){
	if(strcmp(argv[1], "pcm") == 0){
	  vol = get_value(atoi(argv[2]));
	  ioctl(mix, MIXER_WRITE(SOUND_MIXER_PCM), &vol);
	  stats = 0;
	}else if(strcmp(argv[1], "vol") == 0){
	  vol = get_value(atoi(argv[2]));
	  ioctl(mix, MIXER_WRITE(SOUND_MIXER_VOLUME), &vol);
	  stats = 0;
	}
  }
  if(stats < 0){
	usage();
  }
}