Dear fellow hackers,
Let me suggest this patch that adds native ALSA capability to slstatus.
I hope that it is not too far against suckless philosophy to introduce
an optional dependency on a small system library.
To use, add -DALSA to CPPFLAGS, -lasound to LDFLAGS and pass the
control name (e.g. Master) as argument to vol_perc in config.h.
---
components/volume.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/components/volume.c b/components/volume.c
index 61cec90..f0b572e 100644
--- a/components/volume.c
+++ b/components/volume.c
@@ -72,6 +72,61 @@
return bprintf("%d", m ? 0 : v * 100 / 255);
}
+#elif defined(ALSA)
+ #include <alsa/asoundlib.h>
+
+ static const char *devname = "default";
+ const char *
+ vol_perc(const char *mixname)
+ {
+ snd_mixer_t *mixer = NULL;
+ snd_mixer_selem_id_t *mixid = NULL;
+ snd_mixer_elem_t *elem = NULL;
+ long min = 0, max = 0, volume = -1;
+ int err;
+
+ if ((err = snd_mixer_open(&mixer, 0))) {
+ warn("snd_mixer_open: %d", err);
+ return NULL;
+ }
+ if ((err = snd_mixer_attach(mixer, devname))) {
+ warn("snd_mixer_attach(mixer, \"%s\"): %d", devname,
err);
+ goto cleanup;
+ }
+ if ((err = snd_mixer_selem_register(mixer, NULL, NULL))) {
+ warn("snd_mixer_selem_register(mixer, NULL, NULL): %d",
err);
+ goto cleanup;
+ }
+ if ((err = snd_mixer_load(mixer))) {
+ warn("snd_mixer_load(mixer): %d", err);
+ goto cleanup;
+ }
+
+ snd_mixer_selem_id_alloca(&mixid);
+ snd_mixer_selem_id_set_name(mixid, mixname);
+ snd_mixer_selem_id_set_index(mixid, 0);
+
+ elem = snd_mixer_find_selem(mixer, mixid);
+ if (!elem) {
+ warn("snd_mixer_find_selem(mixer, \"%s\") == NULL",
mixname);
+ goto cleanup;
+ }
+
+ if ((err = snd_mixer_selem_get_playback_volume_range(elem,
&min, &max))) {
+ warn("snd_mixer_selem_get_playback_volume_range(): %d",
err);
+ goto cleanup;
+ }
+ if ((err = snd_mixer_selem_get_playback_volume(elem,
SND_MIXER_SCHN_MONO, &volume))) {
+ warn("snd_mixer_selem_get_playback_volume(): %d", err);
+ }
+
+ cleanup:
+ snd_mixer_free(mixer);
+ snd_mixer_detach(mixer, devname);
+ snd_mixer_close(mixer);
+
+ return volume == -1 ? NULL : bprintf("%.0f",
(volume-min)*100./(max-min));
+ }
#else
#include <sys/soundcard.h>
--
Best regards,
Ivan
