Volume plugin

By: xomf

src/modules/volume.h

@@ -0,0 +1,63 @@
+// Authored by xomf <xomf@the-atf-shot-my.dog>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <stdbool.h>
+#include <alsa/asoundlib.h>
+
+
+typedef struct plug_t {
+    char* name;
+    char* version;
+} plug_t;
+
+
+static plug_t* p = {0};
+
+int get_alsa_volume(void) {
+    long min, max, volume;
+    snd_mixer_t* handle;
+    snd_mixer_selem_id_t* sid;
+    const char* card = "default";
+    const char* selem_name = "Master";
+    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_alloca(&sid);
+    snd_mixer_selem_id_set_index(sid, 0);
+    snd_mixer_selem_id_set_name(sid, selem_name);
+    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);
+    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
+    snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_MONO, &volume);
+    snd_mixer_close(handle);
+
+    int percentage = (volume - min) * 100 / (max - min);
+    return percentage;
+}
+
+
+void* plug_init(void) {
+    p = malloc(sizeof(plug_t));
+    assert(p);
+    p->name = "Volume";
+    p->version = "0.0.1";
+    return p;
+}
+
+void* plug_pre_reload(void) {
+    return p;
+}
+
+void plug_post_reload(void* pp) {
+    p = pp;
+}
+
+void plug_poll(char* buf, size_t len) {
+    int volume = get_alsa_volume();
+    snprintf(buf, len, "Volume: %d%%", volume);
+}
+
+void plug_free(void) {}