#include <alsa/asoundlib.h>
#include <alsa/mixer.h>

/**
 * Get volume
 *
 * @return float
 */
float get_volume()
{
    long min, max, v;
    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_handle_events(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(elem, SND_MIXER_SCHN_FRONT_LEFT, &v);
    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
    
    float volume = (((float) v) / ((float)max)) * 100.0f;
    
    snd_mixer_close(handle);
    
    return volume;
}