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// vim:ts=8:expandtab
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef LINUX
#include <alsa/asoundlib.h>
#include <alloca.h>
#endif
#include "i3status.h"
#include "queue.h"
#ifdef LINUX
struct mixer_hdl {
char *device;
char *mixer;
int mixer_idx;
snd_mixer_selem_id_t *sid;
snd_mixer_t *m;
snd_mixer_elem_t *elem;
long min;
long max;
TAILQ_ENTRY(mixer_hdl) handles;
};
TAILQ_HEAD(handles_head, mixer_hdl) cached = TAILQ_HEAD_INITIALIZER(cached);
static void free_hdl(struct mixer_hdl *hdl) {
free(hdl->device);
free(hdl->mixer);
free(hdl);
}
#endif
void print_volume(const char *fmt, const char *device, const char *mixer, int mixer_idx) {
/* Printing volume only works with ALSA at the moment */
#ifdef LINUX
/* Check if we already opened the mixer and get the handle
* from cache if so */
bool found = false;
int err;
struct mixer_hdl *hdl;
TAILQ_FOREACH(hdl, &cached, handles) {
if (strcmp(hdl->device, device) != 0 ||
strcmp(hdl->mixer, mixer) != 0 ||
hdl->mixer_idx != mixer_idx)
continue;
found = true;
break;
}
if (!found) {
if ((hdl = calloc(sizeof(struct mixer_hdl), 1)) == NULL)
return;
if ((hdl->device = strdup(device)) == NULL) {
free(hdl);
return;
}
if ((hdl->mixer = strdup(mixer)) == NULL) {
free(hdl->device);
free(hdl);
return;
}
hdl->mixer_idx = mixer_idx;
snd_mixer_selem_id_malloc(&(hdl->sid));
if (hdl->sid == NULL) {
free_hdl(hdl);
return;
}
if ((err = snd_mixer_open(&(hdl->m), 0)) < 0) {
fprintf(stderr, "ALSA: Cannot open mixer: %s\n", snd_strerror(err));
free_hdl(hdl);
return;
}
/* Attach this mixer handle to the given device */
if ((err = snd_mixer_attach(hdl->m, device)) < 0) {
fprintf(stderr, "ALSA: Cannot attach mixer to device: %s\n", snd_strerror(err));
snd_mixer_close(hdl->m);
free_hdl(hdl);
return;
}
/* Register this mixer */
if ((err = snd_mixer_selem_register(hdl->m, NULL, NULL)) < 0) {
fprintf(stderr, "ALSA: snd_mixer_selem_register: %s\n", snd_strerror(err));
snd_mixer_close(hdl->m);
free_hdl(hdl);
return;
}
if ((err = snd_mixer_load(hdl->m)) < 0) {
fprintf(stderr, "ALSA: snd_mixer_load: %s\n", snd_strerror(err));
snd_mixer_close(hdl->m);
free_hdl(hdl);
return;
}
/* Find the given mixer */
snd_mixer_selem_id_set_index(hdl->sid, mixer_idx);
snd_mixer_selem_id_set_name(hdl->sid, mixer);
if (!(hdl->elem = snd_mixer_find_selem(hdl->m, hdl->sid))) {
fprintf(stderr, "ALSA: Cannot find mixer %s (index %i)\n",
snd_mixer_selem_id_get_name(hdl->sid), snd_mixer_selem_id_get_index(hdl->sid));
snd_mixer_close(hdl->m);
free_hdl(hdl);
return;
}
/* Get the volume range to convert the volume later */
snd_mixer_selem_get_playback_volume_range(hdl->elem, &(hdl->min), &(hdl->max));
TAILQ_INSERT_TAIL(&cached, hdl, handles);
}
long val;
snd_mixer_handle_events (hdl->m);
snd_mixer_selem_get_playback_volume (hdl->elem, 0, &val);
int avg;
if (hdl->max != 100) {
float avgf = ((float)val / hdl->max) * 100;
avg = (int)avgf;
avg = (avgf - avg < 0.5 ? avg : (avg+1));
} else avg = (int)val;
/* Check for mute */
if (snd_mixer_selem_has_playback_switch(hdl->elem)) {
int pbval;
if ((err = snd_mixer_selem_get_playback_switch(hdl->elem, 0, &pbval)) < 0)
fprintf (stderr, "ALSA: playback_switch: %s\n", snd_strerror(err));
if (!pbval)
avg = 0;
}
const char *walk = fmt;
for (; *walk != '\0'; walk++) {
if (*walk != '%') {
putchar(*walk);
continue;
}
if (BEGINS_WITH(walk+1, "volume")) {
printf("%d%%", avg);
walk += strlen("volume");
}
}
#endif
}
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