1/* Copyright 2016 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 */
5
6#ifndef CRAS_OBSERVER_OPS_H
7#define CRAS_OBSERVER_OPS_H
8
9#include "cras_types.h"
10
11/* Observation of CRAS state.
12 * Unless otherwise specified, all notifications only contain the data value
13 * reflecting the current state: it is possible that multiple notifications
14 * are queued within CRAS before being sent to the client.
15 */
16struct cras_observer_ops {
17	/* System output volume changed. */
18	void (*output_volume_changed)(void *context, int32_t volume);
19	/* System output mute changed. */
20	void (*output_mute_changed)(void *context,
21				    int muted, int user_muted, int mute_locked);
22	/* System input/capture gain changed. */
23	void (*capture_gain_changed)(void *context, int32_t gain);
24	/* System input/capture mute changed. */
25	void (*capture_mute_changed)(void *context, int muted, int mute_locked);
26	/* Device or node topology changed. */
27	void (*nodes_changed)(void *context);
28	/* Active node changed. A notification is sent for every change.
29	 * When there is no active node, node_id is 0. */
30	void (*active_node_changed)(void *context,
31				    enum CRAS_STREAM_DIRECTION dir,
32				    cras_node_id_t node_id);
33	/* Output node volume changed. */
34	void (*output_node_volume_changed)(void *context,
35					   cras_node_id_t node_id,
36					   int32_t volume);
37	/* Node left/right swapped state change. */
38	void (*node_left_right_swapped_changed)(void *context,
39						cras_node_id_t node_id,
40						int swapped);
41	/* Input gain changed. */
42	void (*input_node_gain_changed)(void *context,
43					cras_node_id_t node_id,
44					int32_t gain);
45	/* Suspend state changed. */
46	void (*suspend_changed)(void *context,
47				int suspended);
48	/* Number of active streams changed. */
49	void (*num_active_streams_changed)(void *context,
50					   enum CRAS_STREAM_DIRECTION dir,
51					   uint32_t num_active_streams);
52};
53
54#endif /* CRAS_OBSERVER_OPS_H */
55