cras/src/server/cras_hotword_handler.c

/* Copyright (c) 2017 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.
 */

#include <stdint.h>
#include <string.h>
#include <syslog.h>

#include "cras_main_message.h"
#include "cras_observer.h"

struct hotword_triggered_msg {
	struct cras_main_message header;
	int64_t tv_sec;
	int64_t tv_nsec;
};

/* The following functions are called from audio thread. */

static void init_hotword_triggered_msg(struct hotword_triggered_msg *msg)
{
	struct timespec now;

	clock_gettime(CLOCK_MONOTONIC, &now);

	memset(msg, 0, sizeof(*msg));
	msg->header.type = CRAS_MAIN_HOTWORD_TRIGGERED;
	msg->header.length = sizeof(*msg);
	msg->tv_sec = now.tv_sec;
	msg->tv_nsec = now.tv_nsec;
}

int cras_hotword_send_triggered_msg()
{
	struct hotword_triggered_msg msg;
	int rc;

	init_hotword_triggered_msg(&msg);

	rc = cras_main_message_send((struct cras_main_message *)&msg);
	if (rc < 0)
		syslog(LOG_ERR, "Failed to send hotword triggered message!");

	return rc;
}

/* The following functions are called from main thread. */

static void handle_hotword_message(struct cras_main_message *msg, void *arg)
{
	struct hotword_triggered_msg *hotword_msg =
		(struct hotword_triggered_msg *)msg;

	cras_observer_notify_hotword_triggered(hotword_msg->tv_sec,
					       hotword_msg->tv_nsec);
}

int cras_hotword_handler_init()
{
	cras_main_message_add_handler(CRAS_MAIN_HOTWORD_TRIGGERED,
				      handle_hotword_message, NULL);
	return 0;
}