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_H 7 #define CRAS_OBSERVER_H 8 9 #include "cras_observer_ops.h" 10 11 struct cras_observer_client; 12 13 /* Add an observer. 14 * Args: 15 * ops - Set callback function pointers in the operations that should be 16 * called for state changes, or NULL otherwise. 17 * context - Context pointer passed to the callbacks. 18 * Returns: 19 * Valid pointer to the client reference, or NULL on memory allocation 20 * error. 21 */ 22 struct cras_observer_client *cras_observer_add( 23 const struct cras_observer_ops *ops, 24 void *context); 25 26 /* Retrieve the observed state changes. 27 * Args: 28 * client - The client to query. 29 * ops - Filled with the current values in the callback table. 30 */ 31 void cras_observer_get_ops(const struct cras_observer_client *client, 32 struct cras_observer_ops *ops); 33 34 /* Update the observed state changes. 35 * Args: 36 * client - The client to modify. 37 * ops - Set callback function pointers in the operations that should be 38 * called for state changes, or NULL otherwise. 39 */ 40 void cras_observer_set_ops(struct cras_observer_client *client, 41 const struct cras_observer_ops *ops); 42 43 /* Returns non-zero if the given ops are empty. */ 44 int cras_observer_ops_are_empty(const struct cras_observer_ops *ops); 45 46 /* Remove this observer client. 47 * Args: 48 * client - The client to remove. 49 */ 50 void cras_observer_remove(struct cras_observer_client *client); 51 52 /* Initialize the observer server. */ 53 int cras_observer_server_init(); 54 55 /* Destroy the observer server. */ 56 void cras_observer_server_free(); 57 58 /* Notify observers of output volume change. */ 59 void cras_observer_notify_output_volume(int32_t volume); 60 61 /* Notify observers of output mute change. */ 62 void cras_observer_notify_output_mute(int muted, int user_muted, 63 int mute_locked); 64 65 /* Notify observers of capture gain change. */ 66 void cras_observer_notify_capture_gain(int32_t gain); 67 68 /* Notify observers of capture mute change. */ 69 void cras_observer_notify_capture_mute(int muted, int mute_locked); 70 71 /* Notify observers of a nodes list change. */ 72 void cras_observer_notify_nodes(void); 73 74 /* Notify observers of active output node change. */ 75 void cras_observer_notify_active_node(enum CRAS_STREAM_DIRECTION dir, 76 cras_node_id_t node_id); 77 78 /* Notify observers of output node volume change. */ 79 void cras_observer_notify_output_node_volume(cras_node_id_t node_id, 80 int32_t volume); 81 82 /* Notify observers of node left-right swap change. */ 83 void cras_observer_notify_node_left_right_swapped(cras_node_id_t node_id, 84 int swapped); 85 86 /* Notify observers of input node gain change. */ 87 void cras_observer_notify_input_node_gain(cras_node_id_t node_id, 88 int32_t gain); 89 90 /* Notify observers of suspend state changed. */ 91 void cras_observer_notify_suspend_changed(int suspended); 92 93 /* Notify observers of the number of active streams. */ 94 void cras_observer_notify_num_active_streams(enum CRAS_STREAM_DIRECTION dir, 95 uint32_t num_active_streams); 96 97 #endif /* CRAS_OBSERVER_H */ 98
