refactor vol_perc to not depend on alsa libraries

[slstatus.git] / slstatus.c

diff --git a/slstatus.c b/slstatus.c
index 2b63be4..d580ac0 100644 (file)
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,6 +1,5 @@
 /* See LICENSE file for copyright and license details. */
 
-#include <alsa/asoundlib.h>
 #include <err.h>
 #include <fcntl.h>
 #include <ifaddrs.h>
@@ -18,6 +17,7 @@
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/socket.h>
+#include <sys/soundcard.h>
 #include <sys/sysinfo.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
@@ -617,41 +617,26 @@ uid(void)
 static char *
 vol_perc(const char *card)
 {
-       int mute;
-       long int vol, max, min;
-       snd_mixer_t *handle;
-       snd_mixer_elem_t *elem;
-       snd_mixer_selem_id_t *s_elem;
+       unsigned int i;
+       int v, afd, devmask;
+       char *vnames[] = SOUND_DEVICE_NAMES;
 
-       snd_mixer_open(&handle, 0);
-       snd_mixer_attach(handle, card);
-       snd_mixer_selem_register(handle, NULL, NULL);
-       snd_mixer_load(handle);
-       snd_mixer_selem_id_malloc(&s_elem);
-       snd_mixer_selem_id_set_name(s_elem, "Master");
-       elem = snd_mixer_find_selem(handle, s_elem);
-
-       if (elem == NULL) {
-               snd_mixer_selem_id_free(s_elem);
-               snd_mixer_close(handle);
-               warn("Failed to get volume percentage for %s", card);
+       afd = open(card, O_RDONLY);
+       if (afd < 0) {
+               warn("Cannot open %s", card);
                return smprintf(UNKNOWN_STR);
        }
 
-       snd_mixer_handle_events(handle);
-       snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
-       snd_mixer_selem_get_playback_volume(elem, 0, &vol);
-       snd_mixer_selem_get_playback_switch(elem, 0, &mute);
-
-       snd_mixer_selem_id_free(s_elem);
-       snd_mixer_close(handle);
+       ioctl(afd, MIXER_READ(SOUND_MIXER_DEVMASK), &devmask);
+       for (i = 0; i < (sizeof(vnames) / sizeof((vnames[0]))); i++)
+               if (devmask & (1 << i))
+                       if (!strcmp("vol", vnames[i]))
+                               ioctl(afd, MIXER_READ(i), &v);
 
-       if (!mute)
+       close(afd);
+       if (v == 0)
                return smprintf("mute");
-       else if (max == 0)
-               return smprintf("0%%");
-       else
-               return smprintf("%lu%%", ((uint_fast16_t)(vol * 100) / max));
+       return smprintf("%d%%", v & 0xff);
 }
 
 static char *