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/* Copyright 2005 Red Hat, Inc.
 *
 * Portions extraced from various ALSA code:
 *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
 *                   Jaroslav Kysela <perex@suse.cz>
 *                   Takashi Iwai <tiwai@suse.de>
 *                   Bernd Kaindl <bk@suse.de>
 *                   Jan ONDREJ (SAL) <ondrejj@salstar.sk>
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <alsa/asoundlib.h>

#define TRUE  (1==1)
#define FALSE (1!=1)

int verbose = 0;

typedef struct _CHANNEL {

  char name[100];
  int play_volume;
  int play_switch;
  int rec_volume;
  int rec_switch;
  char driver[100];

} CHANNEL;

CHANNEL channels[] = {

//   channel          pl vol  pl swt  rec vol  rec swt     driver

  {"Master", 		75, 	1, 	0, 	0, 	""},
  {"Front", 		75, 	1, 	0, 	0, 	""},
  {"PCM", 		75, 	1, 	0, 	0, 	""},
  {"PCM-2", 		75, 	1, 	0, 	0, 	""},
  {"Synth", 		75, 	1, 	0, 	0, 	""},
  {"CD", 		75, 	1, 	90, 	1, 	""},

  // mute mic
  {"Mic", 		0, 	0, 	0, 	0, 	""},

  // Trident/YMFPCI/emu10k1
  {"Wave", 		100, 	1, 	0, 	0, 	""},
  {"Music", 		100, 	1, 	0, 	0, 	""},
  {"AC97", 		100, 	1, 	0, 	0, 	""},

  // CS4237B chipset
  {"Master Digital", 	75, 	1, 	0, 	0, 	""},

  // Envy24 chips with analog outs
  {"DAC", 		75, 	1, 	0, 	0, 	""},

  // Powermacs
  {"DRC Range", 	75, 	1, 	0, 	0, 	""},

  // some notebooks use headphone instead of master
  {"Headphone", 	75, 	1, 	0, 	0, 	""},
  {"Playback", 		100, 	1, 	0, 	0, 	""},

  // turn off digital switches
  {"SB Live Analog/Digital Output Jack", 0, 0, 0, 0, 	""},
  {"Audigy Analog/Digital Output Jack", 0, 0, 0, 0, 	""},

  // Specific config for ca0106
  {"Analog Front",	75, 	1, 	0, 	0, 	"snd-ca0106"},
  {"Analog Rear",	75, 	1, 	0, 	0, 	"snd-ca0106"},
  {"SPDIF Out",		 0, 	0, 	0, 	0, 	"snd-ca0106"},

  // Specific config for snd-emu10k1
  {"Audigy Analog/Digital Output Jack",	0,1,0, 	0, 	"snd-emu10k1"},
  {"IEC958 Optical Raw", 0,	0,	0, 	0, 	"snd-emu10k1"},
  {"Tone", 		 0,	0,	0, 	0, 	"snd-emu10k1"},

  // Specific config for snd-intel8x0
  {"External Amplifier", 1,	1,	0, 	0, 	"snd-intel8x0"},

  // Specific config for snd-intel8x0 (xw8000)
  {"Master Mono", 	75,	1,	0, 	0, 	"snd-intel8x0"},  

  // Specific config for snd-ens1371
  {"IEC958", 		0,	0,	0, 	0, 	"snd-ens1371"},

  // Specific config for snd-azx/snd-hda
  {"Mono", 		75,	1,	0, 	0, 	"snd-azx"},
  {"Mono", 		75,	1,	0, 	0, 	"snd-hda"}
};

char * strlwr(char *a)     
{
  char *ret = a;

  while (*a != '\0') {
    if (isupper (*a))
      *a = tolower (*a);
    a++;
  }
  return ret;
}

CHANNEL * channel_find(const char *p_name, const char *p_driver) {
  int i;

  for (i = 0; i < sizeof(channels) / sizeof(channels[0]); i++)
    if (!strcmp(channels[i].driver, p_driver) && !strcmp(channels[i].name, p_name))
      return (channels + i);

  return (NULL);
}

int calc_volume(long min, long max, int percent)
{
  return ((int)(min + ((max - min) / 100.0f) * percent));
}

int unmute_card(int index, const char *p_driver)
{
  CHANNEL *p_chan;
  long pmin, pmax;
  long rmin, rmax;
  int rc = 0;
  char card[32];
  char channel_name[500];
  int c,vol;

  snd_mixer_t *handle;
  snd_mixer_selem_id_t *sid;
  snd_mixer_elem_t *elem;
  snd_mixer_selem_id_alloca(&sid);

  if(verbose) {
    fprintf(stderr,"Unmuting %s...\n",p_driver ? p_driver : "");
  }

  sprintf(card, "hw:%d", index);
  if ((rc = snd_mixer_open(&handle, 0)) < 0) {
    if(verbose) {
      fprintf(stderr,"%s: error file %s, line %d...\n",__FUNCTION__,__FILE__,__LINE__);
    }
    return rc;
  }
  if ((rc = snd_mixer_attach(handle, card)) < 0) {
    if(verbose) {
      fprintf(stderr,"%s: error file %s, line %d...\n",__FUNCTION__,__FILE__,__LINE__);
    }
    goto out;
  }
  if ((rc = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
    if(verbose) {
      fprintf(stderr,"%s: error file %s, line %d...\n",__FUNCTION__,__FILE__,__LINE__);
    }
    goto out;
  }
  rc = snd_mixer_load(handle);
  if (rc < 0) {
    if(verbose) {
      fprintf(stderr,"%s: error file %s, line %d...\n",__FUNCTION__,__FILE__,__LINE__);
    }
    goto out;
  }

  for (elem = snd_mixer_first_elem(handle); elem;
       elem = snd_mixer_elem_next(elem)) {

    snd_mixer_selem_get_id(elem, sid);
    strncpy(channel_name,snd_mixer_selem_id_get_name(sid),500);    
    channel_name[499] = '\0';
    p_chan = channel_find(strlwr(channel_name),p_driver);
    if (!p_chan)
      continue;

    for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {

      if (snd_mixer_selem_has_capture_channel(elem, c)) {
        if (snd_mixer_selem_has_capture_switch(elem)) {
          snd_mixer_selem_set_capture_switch(elem, c, p_chan->rec_switch);
	  if(verbose) {
             fprintf(stderr,"Cap. Switch %s(%d) to %d\n",p_chan->name,c,p_chan->rec_switch);
          }
	}
        if (snd_mixer_selem_has_capture_volume(elem)) {
          snd_mixer_selem_get_capture_volume_range(elem, &rmin, &rmax);
	  vol = calc_volume(rmin, rmax,p_chan->rec_volume);
          snd_mixer_selem_set_capture_volume(elem, c, vol);
	  if(verbose) {
             fprintf(stderr,"Cap. Volume %s(%d) to %d\n",p_chan->name,c,vol);
          }	
        }
      }

      if (snd_mixer_selem_has_playback_channel(elem, c)) {
        if (snd_mixer_selem_has_playback_switch(elem)) {
          snd_mixer_selem_set_playback_switch(elem, c, p_chan->play_switch);
	  if(verbose) {
             fprintf(stderr,"Play. Switch %s(%d) to %d\n",p_chan->name,c,p_chan->play_switch);
          }
	}
        if (snd_mixer_selem_has_playback_volume(elem)) {
          snd_mixer_selem_get_playback_volume_range(elem, &pmin, &pmax);
	  vol = calc_volume(pmin, pmax,p_chan->play_volume);
          snd_mixer_selem_set_playback_volume(elem, c, vol);
	  if(verbose) {
             fprintf(stderr,"Play. Volume %s(%d) to %d\n",p_chan->name,c,vol);
          }	             
        }
      }
    }
  }
  return(TRUE);

out:
  snd_mixer_close(handle);
  return rc;
}

char * check_driver_name(char *p_name)
{
  char *p_tmp = strchr(p_name,'-');
  if(p_tmp) {
    *p_tmp = '_';
  }    
  return(p_name);
}

#define PROC_MODULES "/proc/asound/modules"

static char  driver_name[100];

const char * get_card_driver(int index)
{
  FILE *f = fopen(PROC_MODULES,"r");
  char  tmp[100];
  char *p_tmp;  
  int   id;

  if(!f)
    return(NULL);

  while(fgets(tmp,100,f)) {
    sscanf(tmp," %d %s",&id,driver_name);
    if(id == index) {
      return(check_driver_name(driver_name));
    }
  }
 
  return(NULL);
}

void check_data(void)
{
  char *p_tmp;
  int i;

  for (i = 0; i < sizeof(channels) / sizeof(channels[0]); i++) {
    strlwr(channels[i].name);
    check_driver_name(channels[i].driver);
  }
}

void usage(char *p_name)
{
  printf("Alsa Unmute utility, Copyright 2005 Red Hat, Inc.\n");
  printf("This software may be freely redistributed under the terms of the GNU\n");
  printf("public license.\n\n");

  printf("usage: %s card_number [-v]\n\n", p_name);
  printf("    card_number - number of unmuted card\n");
  printf("    [-v]        - verbose mode\n\n");
  exit(0);
}

/* 
   Unmute specified card  
   alsaunmute 0 
*/
int main(int argc, char **argv)
{
  const char *p_driver;
  int index;

  if (argc < 2) {
    usage(argv[0]);
    exit(0);
  }

  index = atoi(argv[1]);
  p_driver = get_card_driver(index);

  if (argc == 3 && (!strcmp(argv[2],"-v") || !strcmp(argv[2],"-V"))) {
    verbose = TRUE;
  }
  
  if(!p_driver) {
    fprintf(stderr,"Wrong card index %d...\n",index);
    return(1);  
  } 

  if(verbose) {
    fprintf(stderr,"Card %d Driver %s...\n",index,p_driver);
  }

  check_data();

  // default settings for all cards
  unmute_card(index,"");

  // specific setting for selected card_number  
  unmute_card(index,p_driver);

  return (0);
}