#include "torsmo.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>

#ifdef HAVE_LINUX_SOUNDCARD_H
#include <linux/soundcard.h>
#else
#include <sys/soundcard.h>
#endif /* HAVE_LINUX_SOUNDCARD_H */

#define MIXER_DEV "/dev/mixer"

static int mixer_fd;
static const char *devs[] = SOUND_DEVICE_NAMES;

int mixer_init(const char *name) {
  unsigned int i;

  if(name == 0 || name[0] == '\0') name = "vol";

  /* open mixer */
  if(mixer_fd <= 0) {
    mixer_fd = open(MIXER_DEV, O_RDONLY);
    if(mixer_fd == -1) {
      ERR("can't open %s: %s", MIXER_DEV, strerror(errno));
      return -1;
    }
  }

  for(i=0; i<sizeof(devs)/sizeof(const char *); i++) {
    if(strcasecmp(devs[i], name) == 0) {
      return i;
    }
  }

  return -1;
}

static int mixer_get(int i) {
  static char rep = 0;
  int val = -1;

  if(ioctl(mixer_fd, MIXER_READ(i), &val) == -1) {
    if(!rep)
      ERR("mixer ioctl: %s", strerror(errno));
    rep = 1;
    return 0;
  }
  rep = 0;

  return val;
}

int mixer_get_avg(int i) {
  int v = mixer_get(i);
  return ((v >> 8) + (v & 0xFF)) / 2;
}

int mixer_get_left(int i) {
  return mixer_get(i) >> 8;
}

int mixer_get_right(int i) {
  return mixer_get(i) & 0xFF;
}