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	slstatus-alsa-4bd78c9.patch (2083B)
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	1 Author: Ivan Krylov <[email protected]>
	2 Date: Sat May 4 11:59:58 2019 +0300
	3
	4 Add ALSA volume support
	5
	6 To use, add -DALSA to CPPFLAGS, -lasound to LDFLAGS and pass the
	7 control name (e.g. Master) as argument to vol_perc in config.h.
	8
	9 diff --git a/components/volume.c b/components/volume.c
	10 index 6cec556..15c5a39 100644
	11 --- a/components/volume.c
	12 +++ b/components/volume.c
	13 @@ -182,6 +182,61 @@
	14
	15 return bprintf("%d", value);
	16 }
	17 +#elif defined(ALSA)
	18 + #include <alsa/asoundlib.h>
	19 +
	20 + static const char *devname = "default";
	21 + const char *
	22 + vol_perc(const char *mixname)
	23 + {
	24 + snd_mixer_t *mixer = NULL;
	25 + snd_mixer_selem_id_t *mixid = NULL;
	26 + snd_mixer_elem_t *elem = NULL;
	27 + long min = 0, max = 0, volume = -1;
	28 + int err;
	29 +
	30 + if ((err = snd_mixer_open(&mixer, 0))) {
	31 + warn("snd_mixer_open: %d", err);
	32 + return NULL;
	33 + }
	34 + if ((err = snd_mixer_attach(mixer, devname))) {
	35 + warn("snd_mixer_attach(mixer, \"%s\"): %d", dev…
	36 + goto cleanup;
	37 + }
	38 + if ((err = snd_mixer_selem_register(mixer, NULL, NULL))…
	39 + warn("snd_mixer_selem_register(mixer, NULL, NUL…
	40 + goto cleanup;
	41 + }
	42 + if ((err = snd_mixer_load(mixer))) {
	43 + warn("snd_mixer_load(mixer): %d", err);
	44 + goto cleanup;
	45 + }
	46 +
	47 + snd_mixer_selem_id_alloca(&mixid);
	48 + snd_mixer_selem_id_set_name(mixid, mixname);
	49 + snd_mixer_selem_id_set_index(mixid, 0);
	50 +
	51 + elem = snd_mixer_find_selem(mixer, mixid);
	52 + if (!elem) {
	53 + warn("snd_mixer_find_selem(mixer, \"%s\") == NU…
	54 + goto cleanup;
	55 + }
	56 +
	57 + if ((err = snd_mixer_selem_get_playback_volume_range(el…
	58 + warn("snd_mixer_selem_get_playback_volume_range…
	59 + goto cleanup;
	60 + }
	61 + if ((err = snd_mixer_selem_get_playback_volume(elem, SN…
	62 + warn("snd_mixer_selem_get_playback_volume(): %d…
	63 + }
	64 +
	65 + cleanup:
	66 + snd_mixer_free(mixer);
	67 + snd_mixer_detach(mixer, devname);
	68 + snd_mixer_close(mixer);
	69 +
	70 + return volume == -1 ? NULL : bprintf("%.0f", (volume-mi…
	71 + }
	72 #else
	73 #include <sys/soundcard.h>
	74