conky/src/mixer.cc

/*
 *
 * Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
 * Copyright (c) 2005-2019 Brenden Matthews, Philip Kovacs, et. al.
 *	(see AUTHORS)
 * All rights reserved.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "conky.h"
#include "logging.h"
#include "specials.h"
#include "text_object.h"

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

#if defined(__sun)
#include <stropts.h>
#include <unistd.h>
#endif

#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) {
      NORM_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) { NORM_ERR("mixer ioctl: %s", strerror(errno)); }
    rep = 1;
    return 0;
  }
  rep = 0;

  return val;
}

static int mixer_get_avg(int i) {
  int v = mixer_get(i);

  return ((v >> 8) + (v & 0xFF)) / 2;
}

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

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

#define mixer_to_255(i, x) x

void parse_mixer_arg(struct text_object *obj, const char *arg) {
  obj->data.l = mixer_init(arg);
}

uint8_t mixer_percentage(struct text_object *obj) {
  return mixer_get_avg(obj->data.l);
}

uint8_t mixerl_percentage(struct text_object *obj) {
  return mixer_get_left(obj->data.l);
}

uint8_t mixerr_percentage(struct text_object *obj) {
  return mixer_get_right(obj->data.l);
}

int check_mixer_muted(struct text_object *obj) {
  if (!mixer_is_mute(obj->data.l)) return 0;
  return 1;
}

void scan_mixer_bar(struct text_object *obj, const char *arg) {
  char buf1[64];
  int n;

  if (arg && sscanf(arg, "%63s %n", buf1, &n) >= 1) {
    obj->data.i = mixer_init(buf1);
    scan_bar(obj, arg + n, 100);
  } else {
    obj->data.i = mixer_init(nullptr);
    scan_bar(obj, arg, 100);
  }
}

double mixer_barval(struct text_object *obj) {
  return mixer_to_255(obj->data.i, mixer_get_avg(obj->data.i));
}

double mixerl_barval(struct text_object *obj) {
  return mixer_to_255(obj->data.i, mixer_get_left(obj->data.i));
}

double mixerr_barval(struct text_object *obj) {
  return mixer_to_255(obj->data.i, mixer_get_right(obj->data.i));
}