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flutter_snowboy.dart
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flutter_snowboy.dart
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/*
* flutter_snowboy - Flutter package wrapper for Snowboy hotword detection.
*
* Copyright (C) 2021-2023 Miðeind ehf.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
library flutter_snowboy;
import 'dart:async';
import 'package:flutter/services.dart';
const kDefaultSensitivity = 0.5;
const kDefaultAudioGain = 1.0;
class Snowboy {
MethodChannel _channel = const MethodChannel('plugin_snowboy');
Function? hotwordHandler;
/// Constructor
Snowboy() {
// Register handler to receive messages from the native plugin.
_channel.setMethodCallHandler(channelMethodCallHandler);
}
/// Handle messages from the native plugin.
Future<dynamic> channelMethodCallHandler(MethodCall methodCall) async {
switch (methodCall.method) {
case 'hotword':
if (hotwordHandler != null) {
hotwordHandler!();
}
break;
default:
throw MissingPluginException('notImplemented');
}
}
void _err(String methodName, String msg) {
print("Error invoking Snowboy '$methodName' method: $msg");
}
/// Instantiate Snowboy in the native plugin code, load
/// provided model and other resources, w. configuration.
Future<bool> prepare(String modelPath,
{double sensitivity = kDefaultSensitivity,
double audioGain = kDefaultAudioGain,
bool applyFrontend = false}) async {
try {
final bool success = await _channel
.invokeMethod('prepareSnowboy', [modelPath, sensitivity, audioGain, applyFrontend]);
return success;
} on PlatformException catch (e) {
_err("prepareSnowboy", e.toString());
return false;
}
}
/// Detect hotword in the provided audio data.
Future<void> detect(Uint8List data) async {
try {
await _channel.invokeMethod('detectSnowboy', [data]);
} on PlatformException catch (e) {
_err("detectSnowboy", e.toString());
}
}
/// Dispose of all resources.
Future<void> purge() async {
try {
await _channel.invokeMethod('purgeSnowboy');
} on PlatformException catch (e) {
_err("purgeSnowboy", e.toString());
}
}
}