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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef CRAS_MAIN_MESSAGE_H_
#define CRAS_MAIN_MESSAGE_H_
#include <stdio.h>
#include "utlist.h"
/* The types of message main thread can handle. */
enum CRAS_MAIN_MESSAGE_TYPE {
/* Audio thread -> main thread */
CRAS_MAIN_A2DP,
CRAS_MAIN_AUDIO_THREAD_EVENT,
CRAS_MAIN_BT,
CRAS_MAIN_METRICS,
CRAS_MAIN_MONITOR_DEVICE,
CRAS_MAIN_HOTWORD_TRIGGERED,
CRAS_MAIN_NON_EMPTY_AUDIO_STATE,
};
/* Structure of the header of the message handled by main thread.
* Args:
* length - Size of the whole message.
* type - Type of the message.
*/
struct cras_main_message {
size_t length;
enum CRAS_MAIN_MESSAGE_TYPE type;
};
/* Callback function to handle main thread message. */
typedef void (*cras_message_callback)(struct cras_main_message *msg, void *arg);
/* Sends a message to main thread. */
int cras_main_message_send(struct cras_main_message *msg);
/* Registers the handler function for specific type of message. */
int cras_main_message_add_handler(enum CRAS_MAIN_MESSAGE_TYPE type,
cras_message_callback callback,
void *callback_data);
/* Initialize the message handling mechanism in main thread. */
void cras_main_message_init();
#endif /* CRAS_MAIN_MESSAGE_H_ */
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