alsa-utils/alsamixer/volume_mapping.h

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#ifndef VOLUME_MAPPING_H_INCLUDED
#define VOLUME_MAPPING_H_INCLUDED
#include <alsa/asoundlib.h>
double get_normalized_playback_volume(snd_mixer_elem_t *elem,
snd_mixer_selem_channel_id_t channel);
double get_normalized_capture_volume(snd_mixer_elem_t *elem,
snd_mixer_selem_channel_id_t channel);
int set_normalized_playback_volume(snd_mixer_elem_t *elem,
snd_mixer_selem_channel_id_t channel,
double volume,
int dir);
int set_normalized_capture_volume(snd_mixer_elem_t *elem,
snd_mixer_selem_channel_id_t channel,
double volume,
int dir);
#endif