Add non-streaming ASR examples for Dart API (#1007)

dart-api-examples/vad/bin/init.dart

@@ -0,0 +1,29 @@
+import 'dart:io';
+import 'dart:isolate';
+import 'package:path/path.dart' as p;
+import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
+
+Future<void> initSherpaOnnx() async {
+  var uri = await Isolate.resolvePackageUri(
+      Uri.parse('package:sherpa_onnx/sherpa_onnx.dart'));
+
+  if (uri == null) {
+    print('File not found');
+    exit(1);
+  }
+
+  String platform = '';
+
+  if (Platform.isMacOS) {
+    platform = 'macos';
+  } else if (Platform.isLinux) {
+    platform = 'linux';
+  } else if (Platform.isWindows) {
+    platform = 'windows';
+  } else {
+    throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
+  }
+
+  final libPath = p.join(p.dirname(p.fromUri(uri)), '..', platform);
+  sherpa_onnx.initBindings(libPath);
+}

dart-api-examples/vad/bin/vad.dart

@@ -1,33 +1,9 @@
 import 'dart:io';
-import 'dart:isolate';
 import 'dart:typed_data';
 
 import 'package:args/args.dart';
-import 'package:path/path.dart' as p;
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
-
-Future<void> initSherpaOnnx() async {
-  var uri = await Isolate.resolvePackageUri(
-      Uri.parse('package:sherpa_onnx/sherpa_onnx.dart'));
-
-  if (uri == null) {
-    print('File not found');
-    exit(1);
-  }
-  String platform = '';
-  if (Platform.isMacOS) {
-    platform = 'macos';
-  } else if (Platform.isLinux) {
-    platform = 'linux';
-  } else if (Platform.isWindows) {
-    platform = 'windows';
-  } else {
-    throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
-  }
-
-  final libPath = p.join(p.dirname(p.fromUri(uri)), '..', platform);
-  sherpa_onnx.initBindings(libPath);
-}
+import './init.dart';
 
 void main(List<String> arguments) async {
   await initSherpaOnnx();
@@ -36,6 +12,7 @@ void main(List<String> arguments) async {
     ..addOption('silero-vad', help: 'Path to silero_vad.onnx')
     ..addOption('input-wav', help: 'Path to input.wav')
     ..addOption('output-wav', help: 'Path to output.wav');
+
   final res = parser.parse(arguments);
   if (res['silero-vad'] == null ||
       res['input-wav'] == null ||
@@ -53,6 +30,7 @@ void main(List<String> arguments) async {
     minSilenceDuration: 0.25,
     minSpeechDuration: 0.5,
   );
+
   final config = sherpa_onnx.VadModelConfig(
     sileroVad: sileroVadConfig,
     numThreads: 1,
@@ -86,8 +64,11 @@ void main(List<String> arguments) async {
     }
   }
 
+  vad.free();
+
   final s = Float32List.fromList(allSamples.expand((x) => x).toList());
   sherpa_onnx.writeWave(
       filename: outputWav, samples: s, sampleRate: waveData.sampleRate);
+
   print('Saved to ${outputWav}');
 }

dart-api-examples/vad/pubspec.lock

@@ -74,10 +74,10 @@ packages:
     dependency: "direct main"
     description:
       name: sherpa_onnx
-      sha256: "6cfadf7bc35001bb1284f9fac1e03e33787cafa918e0c45da96d1e91afa58751"
+      sha256: e45894f81e7c854ca96d678bcab5303036e884a7c90e9a6c4ec04c7b1ee215a8
       url: "https://pub.dev"
     source: hosted
-    version: "0.0.3"
+    version: "1.9.29"
   sky_engine:
     dependency: transitive
     description: flutter

dart-api-examples/vad/pubspec.yaml

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^0.0.3
+  sherpa_onnx: ^1.9.29
   path: ^1.9.0
   args: ^2.5.0