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amixer.c

/*
 *   ALSA command line mixer utility
 *   Copyright (c) 1999-2000 by Jaroslav Kysela <perex@suse.cz>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <stdarg.h>
#include <ctype.h>
#include <math.h>
#include <errno.h>
#include <assert.h>
#include <alsa/asoundlib.h>
#include <sys/poll.h>
#include "amixer.h"

#define HELPID_HELP             1000
#define HELPID_CARD             1001
#define HELPID_DEVICE         1002
#define HELPID_QUIET          1003
#define HELPID_INACTIVE       1004
#define HELPID_DEBUG            1005
#define HELPID_VERSION        1006
#define HELPID_NOCHECK        1007
#define HELPID_ABSTRACT       1008

#define LEVEL_BASIC           (1<<0)
#define LEVEL_INACTIVE        (1<<1)
#define LEVEL_ID        (1<<2)

int quiet = 0;
int debugflag = 0;
int no_check = 0;
int smixer_level = 0;
struct snd_mixer_selem_regopt smixer_options;
char card[64] = "default";

static void error(const char *fmt,...)
{
      va_list va;

      va_start(va, fmt);
      fprintf(stderr, "amixer: ");
      vfprintf(stderr, fmt, va);
      fprintf(stderr, "\n");
      va_end(va);
}

static int help(void)
{
      printf("Usage: amixer <options> command\n");
      printf("\nAvailable options:\n");
      printf("  -h,--help       this help\n");
      printf("  -c,--card N     select the card\n");
      printf("  -D,--device N   select the device, default '%s'\n", card);
      printf("  -d,--debug      debug mode\n");
      printf("  -n,--nocheck    do not perform range checking\n");
      printf("  -v,--version    print version of this program\n");
      printf("  -q,--quiet      be quiet\n");
      printf("  -i,--inactive   show also inactive controls\n");
      printf("  -a,--abstract L select abstraction level (none or basic)\n");
      printf("\nAvailable commands:\n");
      printf("  scontrols       show all mixer simple controls\n");
      printf("  scontents       show contents of all mixer simple controls (default command)\n");
      printf("  sset sID P      set contents for one mixer simple control\n");
      printf("  sget sID        get contents for one mixer simple control\n");
      printf("  controls        show all controls for given card\n");
      printf("  contents        show contents of all controls for given card\n");
      printf("  cset cID P      set control contents for one control\n");
      printf("  cget cID        get control contents for one control\n");
      return 0;
}

static int info(void)
{
      int err;
      snd_ctl_t *handle;
      snd_mixer_t *mhandle;
      snd_ctl_card_info_t *info;
      snd_ctl_elem_list_t *clist;
      snd_ctl_card_info_alloca(&info);
      snd_ctl_elem_list_alloca(&clist);
      
      if ((err = snd_ctl_open(&handle, card, 0)) < 0) {
            error("Control device %s open error: %s", card, snd_strerror(err));
            return err;
      }
      
      if ((err = snd_ctl_card_info(handle, info)) < 0) {
            error("Control device %s hw info error: %s", card, snd_strerror(err));
            return err;
      }
      printf("Card %s '%s'/'%s'\n", card, snd_ctl_card_info_get_id(info),
             snd_ctl_card_info_get_longname(info));
      printf("  Mixer name    : '%s'\n", snd_ctl_card_info_get_mixername(info));
      printf("  Components    : '%s'\n", snd_ctl_card_info_get_components(info));
      if ((err = snd_ctl_elem_list(handle, clist)) < 0) {
            error("snd_ctl_elem_list failure: %s", snd_strerror(err));
      } else {
            printf("  Controls      : %i\n", snd_ctl_elem_list_get_count(clist));
      }
      snd_ctl_close(handle);
      if ((err = snd_mixer_open(&mhandle, 0)) < 0) {
            error("Mixer open error: %s", snd_strerror(err));
            return err;
      }
      if (smixer_level == 0 && (err = snd_mixer_attach(mhandle, card)) < 0) {
            error("Mixer attach %s error: %s", card, snd_strerror(err));
            snd_mixer_close(mhandle);
            return err;
      }
      if ((err = snd_mixer_selem_register(mhandle, smixer_level > 0 ? &smixer_options : NULL, NULL)) < 0) {
            error("Mixer register error: %s", snd_strerror(err));
            snd_mixer_close(mhandle);
            return err;
      }
      err = snd_mixer_load(mhandle);
      if (err < 0) {
            error("Mixer load %s error: %s", card, snd_strerror(err));
            snd_mixer_close(mhandle);
            return err;
      }
      printf("  Simple ctrls  : %i\n", snd_mixer_get_count(mhandle));
      snd_mixer_close(mhandle);
      return 0;
}

static const char *control_iface(snd_ctl_elem_id_t *id)
{
      return snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(id));
}

static const char *control_type(snd_ctl_elem_info_t *info)
{
      return snd_ctl_elem_type_name(snd_ctl_elem_info_get_type(info));
}

static const char *control_access(snd_ctl_elem_info_t *info)
{
      static char result[10];
      char *res = result;

      *res++ = snd_ctl_elem_info_is_readable(info) ? 'r' : '-';
      *res++ = snd_ctl_elem_info_is_writable(info) ? 'w' : '-';
      *res++ = snd_ctl_elem_info_is_inactive(info) ? 'i' : '-';
      *res++ = snd_ctl_elem_info_is_volatile(info) ? 'v' : '-';
      *res++ = snd_ctl_elem_info_is_locked(info) ? 'l' : '-';
      *res++ = '\0';
      return result;
}

static int check_range(int val, int min, int max)
{
      if (no_check)
            return val;
      if (val < min)
            return min;
      if (val > max)
            return max;
      return val;
}

#if 0
static int convert_range(int val, int omin, int omax, int nmin, int nmax)
{
      int orange = omax - omin, nrange = nmax - nmin;
      
      if (orange == 0)
            return 0;
      return rint((((double)nrange * ((double)val - (double)omin)) + ((double)orange / 2.0)) / ((double)orange + (double)nmin));
}
#endif

#if 0
static int convert_db_range(int val, int omin, int omax, int nmin, int nmax)
{
      int orange = omax - omin, nrange = nmax - nmin;
      
      if (orange == 0)
            return 0;
      return rint((((double)nrange * ((double)val - (double)omin)) + ((double)orange / 2.0)) / (double)orange + (double)nmin);
}
#endif

/* Fuction to convert from volume to percentage. val = volume */

static int convert_prange(int val, int min, int max)
{
      int range = max - min;
      int tmp;

      if (range == 0)
            return 0;
      val -= min;
      tmp = rint((double)val/(double)range * 100);
      return tmp;
}

/* Function to convert from percentage to volume. val = percentage */

static int convert_prange1(int val, int min, int max)
{
      int range = max - min;
      int tmp;

      if (range == 0)
            return 0;

      tmp = rint((double)range * ((double)val*.01)) + min;
      return tmp;
}

static const char *get_percent(int val, int min, int max)
{
      static char str[32];
      int p;
      
      p = convert_prange(val, min, max);
      sprintf(str, "%i [%i%%]", val, p);
      return str;
}

#if 0
static const char *get_percent1(int val, int min, int max, int min_dB, int max_dB)
{
      static char str[32];
      int p, db;

      p = convert_prange(val, min, max);
      db = convert_db_range(val, min, max, min_dB, max_dB);
      sprintf(str, "%i [%i%%] [%i.%02idB]", val, p, db / 100, abs(db % 100));
      return str;
}
#endif

static long get_integer(char **ptr, long min, long max)
{
      int tmp, tmp1, tmp2;

      if (**ptr == ':')
            (*ptr)++;
      if (**ptr == '\0' || (!isdigit(**ptr) && **ptr != '-'))
            return min;
      tmp = strtol(*ptr, ptr, 10);
      tmp1 = tmp;
      tmp2 = 0;
      if (**ptr == '.') {
            (*ptr)++;
            tmp2 = strtol(*ptr, ptr, 10);
      }
      if (**ptr == '%') {
            tmp1 = convert_prange1(tmp, min, max);
            (*ptr)++;
      }
      tmp1 = check_range(tmp1, min, max);
      if (**ptr == ',')
            (*ptr)++;
      return tmp1;
}

static long get_integer64(char **ptr, long long min, long long max)
{
      long long tmp, tmp1, tmp2;

      if (**ptr == ':')
            (*ptr)++;
      if (**ptr == '\0' || (!isdigit(**ptr) && **ptr != '-'))
            return min;
      tmp = strtol(*ptr, ptr, 10);
      tmp1 = tmp;
      tmp2 = 0;
      if (**ptr == '.') {
            (*ptr)++;
            tmp2 = strtol(*ptr, ptr, 10);
      }
      if (**ptr == '%') {
            tmp1 = convert_prange1(tmp, min, max);
            (*ptr)++;
      }
      tmp1 = check_range(tmp1, min, max);
      if (**ptr == ',')
            (*ptr)++;
      return tmp1;
}

static int get_volume_simple(char **ptr, int min, int max, int orig)
{
      int tmp, tmp1, tmp2;

      if (**ptr == ':')
            (*ptr)++;
      if (**ptr == '\0' || (!isdigit(**ptr) && **ptr != '-'))
            return min;
      tmp = atoi(*ptr);
      if (**ptr == '-')
            (*ptr)++;
      while (isdigit(**ptr))
            (*ptr)++;
      tmp1 = tmp;
      tmp2 = 0;
      if (**ptr == '.') {
            (*ptr)++;
            tmp2 = atoi(*ptr);
            while (isdigit(**ptr))
                  (*ptr)++;
      }
      if (**ptr == '%') {
            tmp1 = convert_prange1(tmp, min, max);
            (*ptr)++;
      }
      if (**ptr == '+') {
            tmp1 = orig + tmp1;
            (*ptr)++;
      } else if (**ptr == '-') {
            tmp1 = orig - tmp1;
            (*ptr)++;
      }
      tmp1 = check_range(tmp1, min, max);
      if (**ptr == ',')
            (*ptr)++;
      return tmp1;
}

static int get_bool_simple(char **ptr, char *str, int invert, int orig)
{
      if (**ptr == ':')
            (*ptr)++;
      if (!strncasecmp(*ptr, str, strlen(str))) {
            orig = 1 ^ (invert ? 1 : 0);
            while (**ptr != '\0' && **ptr != ',' && **ptr != ':')
                  (*ptr)++;
      }
      if (**ptr == ',' || **ptr == ':')
            (*ptr)++;
      return orig;
}
            
static int simple_skip_word(char **ptr, char *str)
{
      char *xptr = *ptr;
      if (*xptr == ':')
            xptr++;
      if (!strncasecmp(xptr, str, strlen(str))) {
            while (*xptr != '\0' && *xptr != ',' && *xptr != ':')
                  xptr++;
            if (*xptr == ',' || *xptr == ':')
                  xptr++;
            *ptr = xptr;
            return 1;
      }
      return 0;
}
            
static void show_control_id(snd_ctl_elem_id_t *id)
{
      unsigned int index, device, subdevice;
      printf("numid=%u,iface=%s,name='%s'",
             snd_ctl_elem_id_get_numid(id),
             control_iface(id),
             snd_ctl_elem_id_get_name(id));
      index = snd_ctl_elem_id_get_index(id);
      device = snd_ctl_elem_id_get_device(id);
      subdevice = snd_ctl_elem_id_get_subdevice(id);
      if (index)
            printf(",index=%i", index);
      if (device)
            printf(",device=%i", device);
      if (subdevice)
            printf(",subdevice=%i", subdevice);
}

static int show_control(const char *space, snd_hctl_elem_t *elem,
                  int level)
{
      int err;
      unsigned int item, idx;
      unsigned int count;
      snd_ctl_elem_type_t type;
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_value_t *control;
      snd_ctl_elem_id_alloca(&id);
      snd_ctl_elem_info_alloca(&info);
      snd_ctl_elem_value_alloca(&control);
      if ((err = snd_hctl_elem_info(elem, info)) < 0) {
            error("Control %s snd_hctl_elem_info error: %s\n", card, snd_strerror(err));
            return err;
      }
      if (level & LEVEL_ID) {
            snd_hctl_elem_get_id(elem, id);
            show_control_id(id);
            printf("\n");
      }
      count = snd_ctl_elem_info_get_count(info);
      type = snd_ctl_elem_info_get_type(info);
      printf("%s; type=%s,access=%s,values=%i", space, control_type(info), control_access(info), count);
      switch (type) {
      case SND_CTL_ELEM_TYPE_INTEGER:
            printf(",min=%li,max=%li,step=%li\n", 
                   snd_ctl_elem_info_get_min(info),
                   snd_ctl_elem_info_get_max(info),
                   snd_ctl_elem_info_get_step(info));
            break;
      case SND_CTL_ELEM_TYPE_INTEGER64:
            printf(",min=%Li,max=%Li,step=%Li\n", 
                   snd_ctl_elem_info_get_min64(info),
                   snd_ctl_elem_info_get_max64(info),
                   snd_ctl_elem_info_get_step64(info));
            break;
      case SND_CTL_ELEM_TYPE_ENUMERATED:
      {
            unsigned int items = snd_ctl_elem_info_get_items(info);
            printf(",items=%u\n", items);
            for (item = 0; item < items; item++) {
                  snd_ctl_elem_info_set_item(info, item);
                  if ((err = snd_hctl_elem_info(elem, info)) < 0) {
                        error("Control %s element info error: %s\n", card, snd_strerror(err));
                        return err;
                  }
                  printf("%s; Item #%u '%s'\n", space, item, snd_ctl_elem_info_get_item_name(info));
            }
            break;
      }
      default:
            printf("\n");
            break;
      }
      if (level & LEVEL_BASIC) {
            if ((err = snd_hctl_elem_read(elem, control)) < 0) {
                  error("Control %s element read error: %s\n", card, snd_strerror(err));
                  return err;
            }
            printf("%s: values=", space);
            for (idx = 0; idx < count; idx++) {
                  if (idx > 0)
                        printf(",");
                  switch (type) {
                  case SND_CTL_ELEM_TYPE_BOOLEAN:
                        printf("%s", snd_ctl_elem_value_get_boolean(control, idx) ? "on" : "off");
                        break;
                  case SND_CTL_ELEM_TYPE_INTEGER:
                        printf("%li", snd_ctl_elem_value_get_integer(control, idx));
                        break;
                  case SND_CTL_ELEM_TYPE_INTEGER64:
                        printf("%Li", snd_ctl_elem_value_get_integer64(control, idx));
                        break;
                  case SND_CTL_ELEM_TYPE_ENUMERATED:
                        printf("%u", snd_ctl_elem_value_get_enumerated(control, idx));
                        break;
                  case SND_CTL_ELEM_TYPE_BYTES:
                        printf("0x%02x", snd_ctl_elem_value_get_byte(control, idx));
                        break;
                  default:
                        printf("?");
                        break;
                  }
            }
            printf("\n");
      }
      return 0;
}

static int controls(int level)
{
      int err;
      snd_hctl_t *handle;
      snd_hctl_elem_t *elem;
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_id_alloca(&id);
      snd_ctl_elem_info_alloca(&info);
      
      if ((err = snd_hctl_open(&handle, card, 0)) < 0) {
            error("Control %s open error: %s", card, snd_strerror(err));
            return err;
      }
      if ((err = snd_hctl_load(handle)) < 0) {
            error("Control %s local error: %s\n", card, snd_strerror(err));
            return err;
      }
      for (elem = snd_hctl_first_elem(handle); elem; elem = snd_hctl_elem_next(elem)) {
            if ((err = snd_hctl_elem_info(elem, info)) < 0) {
                  error("Control %s snd_hctl_elem_info error: %s\n", card, snd_strerror(err));
                  return err;
            }
            if (!(level & LEVEL_INACTIVE) && snd_ctl_elem_info_is_inactive(info))
                  continue;
            snd_hctl_elem_get_id(elem, id);
            show_control_id(id);
            printf("\n");
            if (level & LEVEL_BASIC)
                  show_control("  ", elem, 1);
      }
      snd_hctl_close(handle);
      return 0;
}

static int show_selem(snd_mixer_t *handle, snd_mixer_selem_id_t *id, const char *space, int level)
{
      snd_mixer_selem_channel_id_t chn;
      long pmin = 0, pmax = 0;
      long cmin = 0, cmax = 0;
      long pvol, cvol;
      int psw, csw;
      int pmono, cmono, mono_ok = 0;
      snd_mixer_elem_t *elem;
      
      elem = snd_mixer_find_selem(handle, id);
      if (!elem) {
            error("Mixer %s simple element not found", card);
            return -ENOENT;
      }

      if (level & LEVEL_BASIC) {
            printf("%sCapabilities:", space);
            if (snd_mixer_selem_has_common_volume(elem)) {
                  printf(" volume");
                  if (snd_mixer_selem_has_playback_volume_joined(elem))
                        printf(" volume-joined");
            } else {
                  if (snd_mixer_selem_has_playback_volume(elem)) {
                        printf(" pvolume");
                        if (snd_mixer_selem_has_playback_volume_joined(elem))
                              printf(" pvolume-joined");
                  }
                  if (snd_mixer_selem_has_capture_volume(elem)) {
                        printf(" cvolume");
                        if (snd_mixer_selem_has_capture_volume_joined(elem))
                              printf(" cvolume-joined");
                  }
            }
            if (snd_mixer_selem_has_common_switch(elem)) {
                  printf(" switch");
                  if (snd_mixer_selem_has_playback_switch_joined(elem))
                        printf(" switch-joined");
            } else {
                  if (snd_mixer_selem_has_playback_switch(elem)) {
                        printf(" pswitch");
                        if (snd_mixer_selem_has_playback_switch_joined(elem))
                              printf(" pswitch-joined");
                  }
                  if (snd_mixer_selem_has_capture_switch(elem)) {
                        printf(" cswitch");
                        if (snd_mixer_selem_has_capture_switch_joined(elem))
                              printf(" cswitch-joined");
                        if (snd_mixer_selem_has_capture_switch_exclusive(elem))
                              printf(" cswitch-exclusive");
                  }
            }
            if (snd_mixer_selem_is_enumerated(elem)) {
                  printf(" enum");
            }
            printf("\n");
            if (snd_mixer_selem_is_enumerated(elem)) {
                  int i, items;
                  unsigned int idx;
                  char itemname[40];
                  items = snd_mixer_selem_get_enum_items(elem);
                  printf("  Items:");
                  for (i = 0; i < items; i++) {
                        snd_mixer_selem_get_enum_item_name(elem, i, sizeof(itemname) - 1, itemname);
                        printf(" '%s'", itemname);
                  }
                  printf("\n");
                  for (i = 0; !snd_mixer_selem_get_enum_item(elem, i, &idx); i++) {
                        snd_mixer_selem_get_enum_item_name(elem, idx, sizeof(itemname) - 1, itemname);
                        printf("  Item%d: '%s'\n", i, itemname);
                  }
                  return 0; /* no more thing to do */
            }
            if (snd_mixer_selem_has_capture_switch_exclusive(elem))
                  printf("%sCapture exclusive group: %i\n", space,
                         snd_mixer_selem_get_capture_group(elem));
            if (snd_mixer_selem_has_playback_volume(elem) ||
                snd_mixer_selem_has_playback_switch(elem)) {
                  printf("%sPlayback channels:", space);
                  if (snd_mixer_selem_is_playback_mono(elem)) {
                        printf(" Mono");
                  } else {
                        int first = 1;
                        for (chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++){
                              if (!snd_mixer_selem_has_playback_channel(elem, chn))
                                    continue;
                              if (!first)
                                    printf(" -");
                              printf(" %s", snd_mixer_selem_channel_name(chn));
                              first = 0;
                        }
                  }
                  printf("\n");
            }
            if (snd_mixer_selem_has_capture_volume(elem) ||
                snd_mixer_selem_has_capture_switch(elem)) {
                  printf("%sCapture channels:", space);
                  if (snd_mixer_selem_is_capture_mono(elem)) {
                        printf(" Mono");
                  } else {
                        int first = 1;
                        for (chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++){
                              if (!snd_mixer_selem_has_capture_channel(elem, chn))
                                    continue;
                              if (!first)
                                    printf(" -");
                              printf(" %s", snd_mixer_selem_channel_name(chn));
                              first = 0;
                        }
                  }
                  printf("\n");
            }
            if (snd_mixer_selem_has_playback_volume(elem) ||
                snd_mixer_selem_has_capture_volume(elem)) {
                  printf("%sLimits:", space);
                  if (snd_mixer_selem_has_common_volume(elem)) {
                        snd_mixer_selem_get_playback_volume_range(elem, &pmin, &pmax);
                        snd_mixer_selem_get_capture_volume_range(elem, &cmin, &cmax);
                        printf(" %li - %li", pmin, pmax);
                  } else {
                        if (snd_mixer_selem_has_playback_volume(elem)) {
                              snd_mixer_selem_get_playback_volume_range(elem, &pmin, &pmax);
                              printf(" Playback %li - %li", pmin, pmax);
                        }
                        if (snd_mixer_selem_has_capture_volume(elem)) {
                              snd_mixer_selem_get_capture_volume_range(elem, &cmin, &cmax);
                              printf(" Capture %li - %li", cmin, cmax);
                        }
                  }
                  printf("\n");
            }
            pmono = snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_MONO) &&
                    (snd_mixer_selem_is_playback_mono(elem) || 
                   (!snd_mixer_selem_has_playback_volume(elem) &&
                    !snd_mixer_selem_has_playback_switch(elem)));
            cmono = snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_MONO) &&
                    (snd_mixer_selem_is_capture_mono(elem) || 
                   (!snd_mixer_selem_has_capture_volume(elem) &&
                    !snd_mixer_selem_has_capture_switch(elem)));
#if 0
            printf("pmono = %i, cmono = %i (%i, %i, %i, %i)\n", pmono, cmono,
                        snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_MONO),
                        snd_mixer_selem_is_capture_mono(elem),
                        snd_mixer_selem_has_capture_volume(elem),
                        snd_mixer_selem_has_capture_switch(elem));
#endif
            if (pmono || cmono) {
                  if (!mono_ok) {
                        printf("%s%s:", space, "Mono");
                        mono_ok = 1;
                  }
                  if (snd_mixer_selem_has_common_volume(elem)) {
                        snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_MONO, &pvol);
                        printf(" %s", get_percent(pvol, pmin, pmax));
                  }
                  if (snd_mixer_selem_has_common_switch(elem)) {
                        snd_mixer_selem_get_playback_switch(elem, SND_MIXER_SCHN_MONO, &psw);
                        printf(" [%s]", psw ? "on" : "off");
                  }
            }
            if (pmono && snd_mixer_selem_has_playback_channel(elem, SND_MIXER_SCHN_MONO)) {
                  int title = 0;
                  if (!mono_ok) {
                        printf("%s%s:", space, "Mono");
                        mono_ok = 1;
                  }
                  if (!snd_mixer_selem_has_common_volume(elem)) {
                        if (snd_mixer_selem_has_playback_volume(elem)) {
                              printf(" Playback");
                              title = 1;
                              snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_MONO, &pvol);
                              printf(" %s", get_percent(pvol, pmin, pmax));
                        }
                  }
                  if (!snd_mixer_selem_has_common_switch(elem)) {
                        if (snd_mixer_selem_has_playback_switch(elem)) {
                              if (!title)
                                    printf(" Playback");
                              snd_mixer_selem_get_playback_switch(elem, SND_MIXER_SCHN_MONO, &psw);
                              printf(" [%s]", psw ? "on" : "off");
                        }
                  }
            }
            if (cmono && snd_mixer_selem_has_capture_channel(elem, SND_MIXER_SCHN_MONO)) {
                  int title = 0;
                  if (!mono_ok) {
                        printf("%s%s:", space, "Mono");
                        mono_ok = 1;
                  }
                  if (!snd_mixer_selem_has_common_volume(elem)) {
                        if (snd_mixer_selem_has_capture_volume(elem)) {
                              printf(" Capture");
                              title = 1;
                              snd_mixer_selem_get_capture_volume(elem, SND_MIXER_SCHN_MONO, &cvol);
                              printf(" %s", get_percent(cvol, cmin, cmax));
                        }
                  }
                  if (!snd_mixer_selem_has_common_switch(elem)) {
                        if (snd_mixer_selem_has_capture_switch(elem)) {
                              if (!title)
                                    printf(" Capture");
                              snd_mixer_selem_get_capture_switch(elem, SND_MIXER_SCHN_MONO, &csw);
                              printf(" [%s]", csw ? "on" : "off");
                        }
                  }
            }
            if (pmono || cmono)
                  printf("\n");
            if (!pmono || !cmono) {
                  for (chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++) {
                        if ((pmono || !snd_mixer_selem_has_playback_channel(elem, chn)) &&
                            (cmono || !snd_mixer_selem_has_capture_channel(elem, chn)))
                              continue;
                        printf("%s%s:", space, snd_mixer_selem_channel_name(chn));
                        if (!pmono && !cmono && snd_mixer_selem_has_common_volume(elem)) {
                              snd_mixer_selem_get_playback_volume(elem, chn, &pvol);
                              printf(" %s", get_percent(pvol, pmin, pmax));
                        }
                        if (!pmono && !cmono && snd_mixer_selem_has_common_switch(elem)) {
                              snd_mixer_selem_get_playback_switch(elem, chn, &psw);
                              printf(" [%s]", psw ? "on" : "off");
                        }
                        if (!pmono && snd_mixer_selem_has_playback_channel(elem, chn)) {
                              int title = 0;
                              if (!snd_mixer_selem_has_common_volume(elem)) {
                                    if (snd_mixer_selem_has_playback_volume(elem)) {
                                          printf(" Playback");
                                          title = 1;
                                          snd_mixer_selem_get_playback_volume(elem, chn, &pvol);
                                          printf(" %s", get_percent(pvol, pmin, pmax));
                                    }
                              }
                              if (!snd_mixer_selem_has_common_switch(elem)) {
                                    if (snd_mixer_selem_has_playback_switch(elem)) {
                                          if (!title)
                                                printf(" Playback");
                                          snd_mixer_selem_get_playback_switch(elem, chn, &psw);
                                          printf(" [%s]", psw ? "on" : "off");
                                    }
                              }
                        }
                        if (!cmono && snd_mixer_selem_has_capture_channel(elem, chn)) {
                              int title = 0;
                              if (!snd_mixer_selem_has_common_volume(elem)) {
                                    if (snd_mixer_selem_has_capture_volume(elem)) {
                                          printf(" Capture");
                                          title = 1;
                                          snd_mixer_selem_get_capture_volume(elem, chn, &cvol);
                                          printf(" %s", get_percent(cvol, cmin, cmax));
                                    }
                              }
                              if (!snd_mixer_selem_has_common_switch(elem)) {
                                    if (snd_mixer_selem_has_capture_switch(elem)) {
                                          if (!title)
                                                printf(" Capture");
                                          snd_mixer_selem_get_capture_switch(elem, chn, &csw);
                                          printf(" [%s]", csw ? "on" : "off");
                                    }
                              }
                        }
                        printf("\n");
                  }
            }
      }
      return 0;
}

static int selems(int level)
{
      int err;
      snd_mixer_t *handle;
      snd_mixer_selem_id_t *sid;
      snd_mixer_elem_t *elem;
      snd_mixer_selem_id_alloca(&sid);
      
      if ((err = snd_mixer_open(&handle, 0)) < 0) {
            error("Mixer %s open error: %s", card, snd_strerror(err));
            return err;
      }
      if (smixer_level == 0 && (err = snd_mixer_attach(handle, card)) < 0) {
            error("Mixer attach %s error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      if ((err = snd_mixer_selem_register(handle, smixer_level > 0 ? &smixer_options : NULL, NULL)) < 0) {
            error("Mixer register error: %s", snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      err = snd_mixer_load(handle);
      if (err < 0) {
            error("Mixer %s load error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      for (elem = snd_mixer_first_elem(handle); elem; elem = snd_mixer_elem_next(elem)) {
            snd_mixer_selem_get_id(elem, sid);
            if (!(level & LEVEL_INACTIVE) && !snd_mixer_selem_is_active(elem))
                  continue;
            printf("Simple mixer control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
            show_selem(handle, sid, "  ", level);
      }
      snd_mixer_close(handle);
      return 0;
}

static int parse_control_id(const char *str, snd_ctl_elem_id_t *id)
{
      int c, size, numid;
      char *ptr;

      while (*str == ' ' || *str == '\t')
            str++;
      if (!(*str))
            return -EINVAL;
      snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);      /* default */
      while (*str) {
            if (!strncasecmp(str, "numid=", 6)) {
                  str += 6;
                  numid = atoi(str);
                  if (numid <= 0) {
                        fprintf(stderr, "amixer: Invalid numid %d\n", numid);
                        return -EINVAL;
                  }
                  snd_ctl_elem_id_set_numid(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "iface=", 6)) {
                  str += 6;
                  if (!strncasecmp(str, "card", 4)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_CARD);
                        str += 4;
                  } else if (!strncasecmp(str, "mixer", 5)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
                        str += 5;
                  } else if (!strncasecmp(str, "pcm", 3)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM);
                        str += 3;
                  } else if (!strncasecmp(str, "rawmidi", 7)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_RAWMIDI);
                        str += 7;
                  } else if (!strncasecmp(str, "timer", 5)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_TIMER);
                        str += 5;
                  } else if (!strncasecmp(str, "sequencer", 9)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_SEQUENCER);
                        str += 9;
                  } else {
                        return -EINVAL;
                  }
            } else if (!strncasecmp(str, "name=", 5)) {
                  char buf[64];
                  str += 5;
                  ptr = buf;
                  size = 0;
                  if (*str == '\'' || *str == '\"') {
                        c = *str++;
                        while (*str && *str != c) {
                              if (size < (int)sizeof(buf)) {
                                    *ptr++ = *str;
                                    size++;
                              }
                              str++;
                        }
                        if (*str == c)
                              str++;
                  } else {
                        while (*str && *str != ',') {
                              if (size < (int)sizeof(buf)) {
                                    *ptr++ = *str;
                                    size++;
                              }
                              str++;
                        }
                        *ptr = '\0';
                  }
                  snd_ctl_elem_id_set_name(id, buf);
            } else if (!strncasecmp(str, "index=", 6)) {
                  str += 6;
                  snd_ctl_elem_id_set_index(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "device=", 7)) {
                  str += 7;
                  snd_ctl_elem_id_set_device(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "subdevice=", 10)) {
                  str += 10;
                  snd_ctl_elem_id_set_subdevice(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            }
            if (*str == ',') {
                  str++;
            } else {
                  if (*str)
                        return -EINVAL;
            }
      }                 
      return 0;
}

static int parse_simple_id(const char *str, snd_mixer_selem_id_t *sid)
{
      int c, size;
      char buf[128];
      char *ptr = buf;

      while (*str == ' ' || *str == '\t')
            str++;
      if (!(*str))
            return -EINVAL;
      size = 1;   /* for '\0' */
      if (*str != '"' && *str != '\'') {
            while (*str && *str != ',') {
                  if (size < (int)sizeof(buf)) {
                        *ptr++ = *str;
                        size++;
                  }
                  str++;
            }
      } else {
            c = *str++;
            while (*str && *str != c) {
                  if (size < (int)sizeof(buf)) {
                        *ptr++ = *str;
                        size++;
                  }
                  str++;
            }
            if (*str == c)
                  str++;
      }
      if (*str == '\0') {
            snd_mixer_selem_id_set_index(sid, 0);
            *ptr = 0;
            goto _set;
      }
      if (*str != ',')
            return -EINVAL;
      *ptr = 0;   /* terminate the string */
      str++;
      if (!isdigit(*str))
            return -EINVAL;
      snd_mixer_selem_id_set_index(sid, atoi(str));
       _set:
      snd_mixer_selem_id_set_name(sid, buf);
      return 0;
}

static int cset(int argc, char *argv[], int roflag)
{
      int err;
      snd_ctl_t *handle;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_value_t *control;
      char *ptr;
      unsigned int idx, count;
      long tmp;
      snd_ctl_elem_type_t type;
      snd_ctl_elem_info_alloca(&info);
      snd_ctl_elem_id_alloca(&id);
      snd_ctl_elem_value_alloca(&control);

      if (argc < 1) {
            fprintf(stderr, "Specify a full control identifier: [[iface=<iface>,][name='name',][index=<index>,][device=<device>,][subdevice=<subdevice>]]|[numid=<numid>]\n");
            return -EINVAL;
      }
      if (parse_control_id(argv[0], id)) {
            fprintf(stderr, "Wrong control identifier: %s\n", argv[0]);
            return -EINVAL;
      }
      if (debugflag) {
            printf("VERIFY ID: ");
            show_control_id(id);
            printf("\n");
      }
      if ((err = snd_ctl_open(&handle, card, 0)) < 0) {
            error("Control %s open error: %s\n", card, snd_strerror(err));
            return err;
      }
      snd_ctl_elem_info_set_id(info, id);
      if ((err = snd_ctl_elem_info(handle, info)) < 0) {
            error("Cannot find the given element from control %s\n", card);
            return err;
      }
      snd_ctl_elem_info_get_id(info, id); /* FIXME: Remove it when hctl find works ok !!! */
      type = snd_ctl_elem_info_get_type(info);
      count = snd_ctl_elem_info_get_count(info);
      snd_ctl_elem_value_set_id(control, id);
      
      if (!roflag) {
            ptr = argv[1];
            for (idx = 0; idx < count && idx < 128 && ptr && *ptr; idx++) {
                  switch (type) {
                  case SND_CTL_ELEM_TYPE_BOOLEAN:
                        tmp = 0;
                        if (!strncasecmp(ptr, "on", 2) || !strncasecmp(ptr, "up", 2)) {
                              tmp = 1;
                              ptr += 2;
                        } else if (!strncasecmp(ptr, "yes", 3)) {
                              tmp = 1;
                              ptr += 3;
                        } else if (!strncasecmp(ptr, "toggle", 6)) {
                              tmp = snd_ctl_elem_value_get_boolean(control, idx);
                              tmp = tmp > 0 ? 0 : 1;
                              ptr += 6;
                        } else if (isdigit(*ptr)) {
                              tmp = atoi(ptr) > 0 ? 1 : 0;
                              while (isdigit(*ptr))
                                    ptr++;
                        } else {
                              while (*ptr && *ptr != ',')
                                    ptr++;
                        }
                        snd_ctl_elem_value_set_boolean(control, idx, tmp);
                        break;
                  case SND_CTL_ELEM_TYPE_INTEGER:
                        tmp = get_integer(&ptr,
                                      snd_ctl_elem_info_get_min(info),
                                      snd_ctl_elem_info_get_max(info));
                        snd_ctl_elem_value_set_integer(control, idx, tmp);
                        break;
                  case SND_CTL_ELEM_TYPE_INTEGER64:
                        tmp = get_integer64(&ptr,
                                      snd_ctl_elem_info_get_min64(info),
                                      snd_ctl_elem_info_get_max64(info));
                        snd_ctl_elem_value_set_integer64(control, idx, tmp);
                        break;
                  case SND_CTL_ELEM_TYPE_ENUMERATED:
                        tmp = get_integer(&ptr, 0, snd_ctl_elem_info_get_items(info) - 1);
                        snd_ctl_elem_value_set_enumerated(control, idx, tmp);
                        break;
                  case SND_CTL_ELEM_TYPE_BYTES:
                        tmp = get_integer(&ptr, 0, 255);
                        snd_ctl_elem_value_set_byte(control, idx, tmp);
                        break;
                  default:
                        break;
                  }
                  if (!strchr(argv[1], ','))
                        ptr = argv[1];
                  else if (*ptr == ',')
                        ptr++;
            }
            if ((err = snd_ctl_elem_write(handle, control)) < 0) {
                  error("Control %s element write error: %s\n", card, snd_strerror(err));
                  return err;
            }
      }
      snd_ctl_close(handle);
      if (!quiet) {
            snd_hctl_t *hctl;
            snd_hctl_elem_t *elem;
            if ((err = snd_hctl_open(&hctl, card, 0)) < 0) {
                  error("Control %s open error: %s\n", card, snd_strerror(err));
                  return err;
            }
            if ((err = snd_hctl_load(hctl)) < 0) {
                  error("Control %s load error: %s\n", card, snd_strerror(err));
                  return err;
            }
            elem = snd_hctl_find_elem(hctl, id);
            if (elem)
                  show_control("  ", elem, LEVEL_BASIC | LEVEL_ID);
            else
                  printf("Could not find the specified element\n");
            snd_hctl_close(hctl);
      }
      return 0;
}

typedef struct channel_mask {
      char *name;
      unsigned int mask;
} channel_mask_t;
static channel_mask_t chanmask[] = {
      {"frontleft", 1 << SND_MIXER_SCHN_FRONT_LEFT},
      {"frontright", 1 << SND_MIXER_SCHN_FRONT_RIGHT},
      {"frontcenter", 1 << SND_MIXER_SCHN_FRONT_CENTER},
      {"front", ((1 << SND_MIXER_SCHN_FRONT_LEFT) |
               (1 << SND_MIXER_SCHN_FRONT_RIGHT))},
      {"center", 1 << SND_MIXER_SCHN_FRONT_CENTER},
      {"rearleft", 1 << SND_MIXER_SCHN_REAR_LEFT},
      {"rearright", 1 << SND_MIXER_SCHN_REAR_RIGHT},
      {"rear", ((1 << SND_MIXER_SCHN_REAR_LEFT) |
              (1 << SND_MIXER_SCHN_REAR_RIGHT))},
      {"woofer", 1 << SND_MIXER_SCHN_WOOFER},
      {NULL, 0}
};

static unsigned int channels_mask(char **arg, unsigned int def)
{
      channel_mask_t *c;

      for (c = chanmask; c->name; c++) {
            if (strncasecmp(*arg, c->name, strlen(c->name)) == 0) {
                  while (**arg != '\0' && **arg != ',' && **arg != ' ' && **arg != '\t')
                        (*arg)++;
                  if (**arg == ',' || **arg == ' ' || **arg == '\t')
                        (*arg)++;
                  return c->mask;
            }
      }
      return def;
}

static unsigned int dir_mask(char **arg, unsigned int def)
{
      int findend = 0;

      if (strncasecmp(*arg, "playback", 8) == 0)
            def = findend = 1;
      else if (strncasecmp(*arg, "capture", 8) == 0)
            def = findend = 2;
      if (findend) {
            while (**arg != '\0' && **arg != ',' && **arg != ' ' && **arg != '\t')
                  (*arg)++;
            if (**arg == ',' || **arg == ' ' || **arg == '\t')
                  (*arg)++;
      }
      return def;
}

static int get_enum_item_index(snd_mixer_elem_t *elem, char **ptrp)
{
      char *ptr = *ptrp;
      int items, i, len;
      char name[40];
      
      items = snd_mixer_selem_get_enum_items(elem);
      if (items <= 0)
            return -1;

      for (i = 0; i < items; i++) {
            if (snd_mixer_selem_get_enum_item_name(elem, i, sizeof(name)-1, name) < 0)
                  continue;
            len = strlen(name);
            if (! strncmp(name, ptr, len)) {
                  if (! ptr[len] || ptr[len] == ',' || ptr[len] == '\n') {
                        ptr += len;
                        *ptrp = ptr;
                        return i;
                  }
            }
      }
      return -1;
}

static int sset(unsigned int argc, char *argv[], int roflag)
{
      int err;
      unsigned int idx;
      snd_mixer_selem_channel_id_t chn;
      unsigned int channels = ~0U;
      unsigned int dir = 3, okflag = 3;
      long pmin, pmax, cmin, cmax;
      snd_mixer_t *handle;
      snd_mixer_elem_t *elem;
      snd_mixer_selem_id_t *sid;
      snd_mixer_selem_id_alloca(&sid);

      if (argc < 1) {
            fprintf(stderr, "Specify a scontrol identifier: 'name',index\n");
            return 1;
      }
      if (parse_simple_id(argv[0], sid)) {
            fprintf(stderr, "Wrong scontrol identifier: %s\n", argv[0]);
            return 1;
      }
      if (!roflag && argc < 2) {
            fprintf(stderr, "Specify what you want to set...\n");
            return 1;
      }
      if ((err = snd_mixer_open(&handle, 0)) < 0) {
            error("Mixer %s open error: %s\n", card, snd_strerror(err));
            return err;
      }
      if (smixer_level == 0 && (err = snd_mixer_attach(handle, card)) < 0) {
            error("Mixer attach %s error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      if ((err = snd_mixer_selem_register(handle, smixer_level > 0 ? &smixer_options : NULL, NULL)) < 0) {
            error("Mixer register error: %s", snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      err = snd_mixer_load(handle);
      if (err < 0) {
            error("Mixer %s load error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      elem = snd_mixer_find_selem(handle, sid);
      if (!elem) {
            error("Unable to find simple control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
            snd_mixer_close(handle);
            return -ENOENT;
      }
      if (roflag)
            goto __skip_write;
      snd_mixer_selem_get_playback_volume_range(elem, &pmin, &pmax);
      snd_mixer_selem_get_capture_volume_range(elem, &cmin, &cmax);
      for (idx = 1; idx < argc; idx++) {
            char *ptr = argv[idx], *optr;
            int multi, firstchn = 1;
            channels = channels_mask(&ptr, channels);
            if (*ptr == '\0')
                  continue;
            dir = dir_mask(&ptr, dir);
            if (*ptr == '\0')
                  continue;
            multi = (strchr(ptr, ',') != NULL);
            optr = ptr;
            for (chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++) {
                  char *sptr = NULL;
                  int ival;
                  long lval;

                  if (!(channels & (1 << chn)))
                        continue;
                  /* enum control */
                  if (snd_mixer_selem_is_enumerated(elem)) {
                        int idx = get_enum_item_index(elem, &ptr);
                        if (idx < 0)
                              break;
                        else
                              snd_mixer_selem_set_enum_item(elem, chn, idx);
                        if (!multi)
                              ptr = optr;
                        continue;
                  }

                  if ((dir & 1) && snd_mixer_selem_has_playback_channel(elem, chn)) {
                        sptr = ptr;
                        if (!strncmp(ptr, "mute", 4) && snd_mixer_selem_has_playback_switch(elem)) {
                              snd_mixer_selem_get_playback_switch(elem, chn, &ival);
                              snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "mute", 1, ival));
                        } else if (!strncmp(ptr, "off", 3) && snd_mixer_selem_has_playback_switch(elem)) {
                              snd_mixer_selem_get_playback_switch(elem, chn, &ival);
                              snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "off", 1, ival));
                        } else if (!strncmp(ptr, "unmute", 6) && snd_mixer_selem_has_playback_switch(elem)) {
                              snd_mixer_selem_get_playback_switch(elem, chn, &ival);
                              snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "unmute", 0, ival));
                        } else if (!strncmp(ptr, "on", 2) && snd_mixer_selem_has_playback_switch(elem)) {
                              snd_mixer_selem_get_playback_switch(elem, chn, &ival);
                              snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "on", 0, ival));
                        } else if (!strncmp(ptr, "toggle", 6) && snd_mixer_selem_has_playback_switch(elem)) {
                              if (firstchn || !snd_mixer_selem_has_playback_switch_joined(elem)) {
                                    snd_mixer_selem_get_playback_switch(elem, chn, &ival);
                                    snd_mixer_selem_set_playback_switch(elem, chn, (ival ? 1 : 0) ^ 1);
                              }
                              simple_skip_word(&ptr, "toggle");
                        } else if (isdigit(*ptr) || *ptr == '-' || *ptr == '+') {
                              if (snd_mixer_selem_has_playback_volume(elem)) {
                                    snd_mixer_selem_get_playback_volume(elem, chn, &lval);
                                    snd_mixer_selem_set_playback_volume(elem, chn, get_volume_simple(&ptr, pmin, pmax, lval));
                              } else {
                                    get_volume_simple(&ptr, 0, 100, 0);
                              }
                        } else if (simple_skip_word(&ptr, "cap") || simple_skip_word(&ptr, "rec") ||
                                 simple_skip_word(&ptr, "nocap") || simple_skip_word(&ptr, "norec")) {
                              /* nothing */
                        } else {
                              okflag &= ~1;
                        }
                  }
                  if ((dir & 2) && snd_mixer_selem_has_capture_channel(elem, chn)) {
                        if (sptr != NULL)
                              ptr = sptr;
                        sptr = ptr;
                        if (!strncmp(ptr, "cap", 3) && snd_mixer_selem_has_capture_switch(elem)) {
                              snd_mixer_selem_get_capture_switch(elem, chn, &ival);
                              snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "cap", 0, ival));
                        } else if (!strncmp(ptr, "rec", 3) && snd_mixer_selem_has_capture_switch(elem)) {
                              snd_mixer_selem_get_capture_switch(elem, chn, &ival);
                              snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "rec", 0, ival));
                        } else if (!strncmp(ptr, "nocap", 5) && snd_mixer_selem_has_capture_switch(elem)) {
                              snd_mixer_selem_get_capture_switch(elem, chn, &ival);
                              snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "nocap", 1, ival));
                        } else if (!strncmp(ptr, "norec", 5) && snd_mixer_selem_has_capture_switch(elem)) {
                              snd_mixer_selem_get_capture_switch(elem, chn, &ival);
                              snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "norec", 1, ival));
                        } else if (!strncmp(ptr, "toggle", 6) && snd_mixer_selem_has_capture_switch(elem)) {
                              if (firstchn || !snd_mixer_selem_has_capture_switch_joined(elem)) {
                                    snd_mixer_selem_get_capture_switch(elem, chn, &ival);
                                    snd_mixer_selem_set_capture_switch(elem, chn, (ival ? 1 : 0) ^ 1);
                              }
                              simple_skip_word(&ptr, "toggle");
                        } else if (isdigit(*ptr) || *ptr == '-' || *ptr == '+') {
                              if (snd_mixer_selem_has_capture_volume(elem)) {
                                    snd_mixer_selem_get_capture_volume(elem, chn, &lval);
                                    snd_mixer_selem_set_capture_volume(elem, chn, get_volume_simple(&ptr, cmin, cmax, lval));
                              } else {
                                    get_volume_simple(&ptr, 0, 100, 0);
                              }
                        } else if (simple_skip_word(&ptr, "mute") || simple_skip_word(&ptr, "off") ||
                                 simple_skip_word(&ptr, "unmute") || simple_skip_word(&ptr, "on")) {
                              /* nothing */
                        } else {
                              okflag &= ~2;
                        }
                  }
                  if (okflag == 0) {
                        if (dir & 1)
                              error("Unknown playback setup '%s'..\n", ptr);
                        if (dir & 2)
                              error("Unknown capture setup '%s'..\n", ptr);
                        snd_mixer_close(handle);
                        return err;
                  }
                  if (!multi)
                        ptr = optr;
                  firstchn = 0;
            }
      } 
      __skip_write:
      if (!quiet) {
            printf("Simple mixer control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
            show_selem(handle, sid, "  ", 1);
      }
      snd_mixer_close(handle);
      return 0;
}

static void events_info(snd_hctl_elem_t *helem)
{
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_id_alloca(&id);
      snd_hctl_elem_get_id(helem, id);
      printf("event info: ");
      show_control_id(id);
      printf("\n");
}

static void events_value(snd_hctl_elem_t *helem)
{
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_id_alloca(&id);
      snd_hctl_elem_get_id(helem, id);
      printf("event value: ");
      show_control_id(id);
      printf("\n");
}

static void events_remove(snd_hctl_elem_t *helem)
{
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_id_alloca(&id);
      snd_hctl_elem_get_id(helem, id);
      printf("event remove: ");
      show_control_id(id);
      printf("\n");
}

int element_callback(snd_hctl_elem_t *elem, unsigned int mask)
{
      if (mask == SND_CTL_EVENT_MASK_REMOVE) {
            events_remove(elem);
            return 0;
      }
      if (mask & SND_CTL_EVENT_MASK_INFO) 
            events_info(elem);
      if (mask & SND_CTL_EVENT_MASK_VALUE) 
            events_value(elem);
      return 0;
}

static void events_add(snd_hctl_elem_t *helem)
{
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_id_alloca(&id);
      snd_hctl_elem_get_id(helem, id);
      printf("event add: ");
      show_control_id(id);
      printf("\n");
      snd_hctl_elem_set_callback(helem, element_callback);
}

int ctl_callback(snd_hctl_t *ctl, unsigned int mask,
             snd_hctl_elem_t *elem)
{
      if (mask & SND_CTL_EVENT_MASK_ADD)
            events_add(elem);
      return 0;
}

static int events(int argc ATTRIBUTE_UNUSED, char *argv[] ATTRIBUTE_UNUSED)
{
      snd_hctl_t *handle;
      snd_hctl_elem_t *helem;
      int err;

      if ((err = snd_hctl_open(&handle, card, 0)) < 0) {
            error("Control %s open error: %s\n", card, snd_strerror(err));
            return err;
      }
      snd_hctl_set_callback(handle, ctl_callback);
      if ((err = snd_hctl_load(handle)) < 0) {
            error("Control %s hbuild error: %s\n", card, snd_strerror(err));
            return err;
      }
      for (helem = snd_hctl_first_elem(handle); helem; helem = snd_hctl_elem_next(helem)) {
            snd_hctl_elem_set_callback(helem, element_callback);
      }
      printf("Ready to listen...\n");
      while (1) {
            int res = snd_hctl_wait(handle, -1);
            if (res >= 0) {
                  printf("Poll ok: %i\n", res);
                  res = snd_hctl_handle_events(handle);
                  assert(res > 0);
            }
      }
      snd_hctl_close(handle);
      return 0;
}

static void sevents_value(snd_mixer_selem_id_t *sid)
{
      printf("event value: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

static void sevents_info(snd_mixer_selem_id_t *sid)
{
      printf("event info: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

static void sevents_remove(snd_mixer_selem_id_t *sid)
{
      printf("event remove: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

int melem_event(snd_mixer_elem_t *elem, unsigned int mask)
{
      snd_mixer_selem_id_t *sid;
      snd_mixer_selem_id_alloca(&sid);
      snd_mixer_selem_get_id(elem, sid);
      if (mask == SND_CTL_EVENT_MASK_REMOVE) {
            sevents_remove(sid);
            return 0;
      }
      if (mask & SND_CTL_EVENT_MASK_INFO) 
            sevents_info(sid);
      if (mask & SND_CTL_EVENT_MASK_VALUE) 
            sevents_value(sid);
      return 0;
}

static void sevents_add(snd_mixer_elem_t *elem)
{
      snd_mixer_selem_id_t *sid;
      snd_mixer_selem_id_alloca(&sid);
      snd_mixer_selem_get_id(elem, sid);
      printf("event add: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
      snd_mixer_elem_set_callback(elem, melem_event);
}

int mixer_event(snd_mixer_t *mixer, unsigned int mask,
            snd_mixer_elem_t *elem)
{
      if (mask & SND_CTL_EVENT_MASK_ADD)
            sevents_add(elem);
      return 0;
}

static int sevents(int argc ATTRIBUTE_UNUSED, char *argv[] ATTRIBUTE_UNUSED)
{
      snd_mixer_t *handle;
      int err;

      if ((err = snd_mixer_open(&handle, 0)) < 0) {
            error("Mixer %s open error: %s", card, snd_strerror(err));
            return err;
      }
      if (smixer_level == 0 && (err = snd_mixer_attach(handle, card)) < 0) {
            error("Mixer attach %s error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      if ((err = snd_mixer_selem_register(handle, smixer_level > 0 ? &smixer_options : NULL, NULL)) < 0) {
            error("Mixer register error: %s", snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }
      snd_mixer_set_callback(handle, mixer_event);
      err = snd_mixer_load(handle);
      if (err < 0) {
            error("Mixer %s load error: %s", card, snd_strerror(err));
            snd_mixer_close(handle);
            return err;
      }

      printf("Ready to listen...\n");
      while (1) {
            int res;
            res = snd_mixer_wait(handle, -1);
            if (res >= 0) {
                  printf("Poll ok: %i\n", res);
                  res = snd_mixer_handle_events(handle);
                  assert(res >= 0);
            }
      }
      snd_mixer_close(handle);
      return 0;
}

int main(int argc, char *argv[])
{
      int morehelp, level = 0;
      struct option long_option[] =
      {
            {"help", 0, NULL, HELPID_HELP},
            {"card", 1, NULL, HELPID_CARD},
            {"device", 1, NULL, HELPID_DEVICE},
            {"quiet", 0, NULL, HELPID_QUIET},
            {"inactive", 0, NULL, HELPID_INACTIVE},
            {"debug", 0, NULL, HELPID_DEBUG},
            {"nocheck", 0, NULL, HELPID_NOCHECK},
            {"version", 0, NULL, HELPID_VERSION},
            {"abstract", 1, NULL, HELPID_ABSTRACT},
            {NULL, 0, NULL, 0},
      };

      morehelp = 0;
      while (1) {
            int c;

            if ((c = getopt_long(argc, argv, "hc:D:qidnva:", long_option, NULL)) < 0)
                  break;
            switch (c) {
            case 'h':
            case HELPID_HELP:
                  help();
                  return 0;
            case 'c':
            case HELPID_CARD:
                  {
                        int i;
                        i = snd_card_get_index(optarg);
                        if (i >= 0 && i < 32)
                              sprintf(card, "hw:%i", i);
                        else {
                              fprintf(stderr, "\07Invalid card number.\n");
                              morehelp++;
                        }
                  }
                  break;
            case 'D':
            case HELPID_DEVICE:
                  strncpy(card, optarg, sizeof(card)-1);
                  card[sizeof(card)-1] = '\0';
                  break;
            case 'q':
            case HELPID_QUIET:
                  quiet = 1;
                  break;
            case 'i':
            case HELPID_INACTIVE:
                  level |= LEVEL_INACTIVE;
                  break;
            case 'd':
            case HELPID_DEBUG:
                  debugflag = 1;
                  break;
            case 'n':
            case HELPID_NOCHECK:
                  no_check = 1;
                  break;
            case 'v':
            case HELPID_VERSION:
                  printf("amixer version " SND_UTIL_VERSION_STR "\n");
                  return 1;
            case 'a':
            case HELPID_ABSTRACT:
                  smixer_level = 1;
                  memset(&smixer_options, 0, sizeof(smixer_options));
                  smixer_options.ver = 1;
                  if (!strcmp(optarg, "none"))
                        smixer_options.abstract = SND_MIXER_SABSTRACT_NONE;
                  else if (!strcmp(optarg, "basic"))
                        smixer_options.abstract = SND_MIXER_SABSTRACT_BASIC;
                  else {
                        fprintf(stderr, "Select correct abstraction level (none or basic)...\n");
                        morehelp++;
                  }
                  break;
            default:
                  fprintf(stderr, "\07Invalid switch or option needs an argument.\n");
                  morehelp++;
            }
      }
      if (morehelp) {
            help();
            return 1;
      }
      smixer_options.device = card;
      if (argc - optind <= 0) {
            return selems(LEVEL_BASIC | level) ? 1 : 0;
      }
      if (!strcmp(argv[optind], "help")) {
            return help() ? 1 : 0;
      } else if (!strcmp(argv[optind], "info")) {
            return info() ? 1 : 0;
      } else if (!strcmp(argv[optind], "controls")) {
            return controls(level) ? 1 : 0;
      } else if (!strcmp(argv[optind], "contents")) {
            return controls(LEVEL_BASIC | level) ? 1 : 0;
      } else if (!strcmp(argv[optind], "scontrols") || !strcmp(argv[optind], "simple")) {
            return selems(level) ? 1 : 0;
      } else if (!strcmp(argv[optind], "scontents")) {
            return selems(LEVEL_BASIC | level) ? 1 : 0;
      } else if (!strcmp(argv[optind], "sset") || !strcmp(argv[optind], "set")) {
            return sset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 0) ? 1 : 0;
      } else if (!strcmp(argv[optind], "sget") || !strcmp(argv[optind], "get")) {
            return sset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 1) ? 1 : 0;
      } else if (!strcmp(argv[optind], "cset")) {
            return cset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 0) ? 1 : 0;
      } else if (!strcmp(argv[optind], "cget")) {
            return cset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 1) ? 1 : 0;
      } else if (!strcmp(argv[optind], "events")) {
            return events(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL);
      } else if (!strcmp(argv[optind], "sevents")) {
            return sevents(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL);
      } else {
            fprintf(stderr, "amixer: Unknown command '%s'...\n", argv[optind]);
      }

      return 0;
}

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