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/*
* Copyright © 2019 Collabora Ltd.
* @author George Kiagiadakis <george.kiagiadakis@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#ifndef _AUDIOMIXER_H
#define _AUDIOMIXER_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdbool.h>
struct audiomixer;
struct mixer_control
{
char name[32];
double volume;
double lvolume; /* left channel volume */
double rvolume; /* right channel volume */
float gain;
bool mute;
};
#define MIXER_CONTROL_CHANGE_FLAG_VOLUME (1<<0)
#define MIXER_CONTROL_CHANGE_FLAG_CHANNEL_VOLUME (1<<1)
#define MIXER_CONTROL_CHANGE_FLAG_MUTE (1<<2)
#define MIXER_CONTROL_CHANGE_FLAG_GAIN (1<<3)
struct audiomixer_events
{
void (*controls_changed) (void *data);
void (*value_changed) (void *data,
unsigned int change_mask,
const struct mixer_control *control);
};
struct audiomixer * audiomixer_new(void);
void audiomixer_free(struct audiomixer *self);
/* locking is required to call any of the methods below
* and to access any structure maintained by audiomixer */
void audiomixer_lock(struct audiomixer *self);
void audiomixer_unlock(struct audiomixer *self);
int audiomixer_ensure_controls(struct audiomixer *self, int timeout_sec);
const struct mixer_control ** audiomixer_get_active_controls(
struct audiomixer *self,
unsigned int *n_controls);
const struct mixer_control * audiomixer_find_control(
struct audiomixer *self,
const char *name);
void audiomixer_add_event_listener(struct audiomixer *self,
const struct audiomixer_events *events,
void *data);
void audiomixer_change_volume(struct audiomixer *self,
const struct mixer_control *control,
double volume);
void audiomixer_change_channel_volume (struct audiomixer *self,
const struct mixer_control *control,
double left_channel_volume, double right_channel_volume);
void audiomixer_change_gain(struct audiomixer *self,
const struct mixer_control *control,
float gain);
void audiomixer_change_mute(struct audiomixer *self,
const struct mixer_control *control,
bool mute);
#ifdef __cplusplus
}
#endif
#endif // _AUDIOMIXER_H
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