Add Pascal/Go/C#/Dart API for NeMo Canary ASR models (#2367)

Add support for the new NeMo Canary ASR model across multiple language bindings by introducing a Canary model configuration and setter method on the offline recognizer.

- Define Canary model config in Pascal, Go, C#, Dart and update converter functions
- Add SetConfig API for offline recognizer (Pascal, Go, C#, Dart)
- Extend CI/workflows and example scripts to test non-streaming Canary decoding

dart-api-examples/non-streaming-asr/bin/nemo-canary.dart

@@ -0,0 +1,84 @@
+// Copyright (c)  2025  Xiaomi Corporation
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
+
+import './init.dart';
+
+void main(List<String> arguments) async {
+  await initSherpaOnnx();
+
+  final parser = ArgParser()
+    ..addOption('encoder', help: 'Path to the NeMo Canary encoder model')
+    ..addOption('decoder', help: 'Path to the NeMo Canary decoder model')
+    ..addOption('src-lang', help: 'Language of the input audio')
+    ..addOption('tgt-lang', help: 'Language of the recognition result')
+    ..addOption('tokens', help: 'Path to tokens.txt')
+    ..addOption('input-wav', help: 'Path to input.wav to transcribe');
+
+  final res = parser.parse(arguments);
+  if (res['encoder'] == null ||
+      res['decoder'] == null ||
+      res['src-lang'] == null ||
+      res['tgt-lang'] == null ||
+      res['tokens'] == null ||
+      res['input-wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final encoder = res['encoder'] as String;
+  final decoder = res['decoder'] as String;
+  final srcLang = res['src-lang'] as String;
+  final tgtLang = res['tgt-lang'] as String;
+  final tokens = res['tokens'] as String;
+  final inputWav = res['input-wav'] as String;
+
+  final canary = sherpa_onnx.OfflineCanaryModelConfig(
+      encoder: encoder, decoder: decoder, srcLang: srcLang, tgtLang: tgtLang);
+
+  final modelConfig = sherpa_onnx.OfflineModelConfig(
+    canary: canary,
+    tokens: tokens,
+    debug: false,
+    numThreads: 1,
+  );
+  var config = sherpa_onnx.OfflineRecognizerConfig(model: modelConfig);
+  final recognizer = sherpa_onnx.OfflineRecognizer(config);
+
+  final waveData = sherpa_onnx.readWave(inputWav);
+  final stream = recognizer.createStream();
+
+  stream.acceptWaveform(
+      samples: waveData.samples, sampleRate: waveData.sampleRate);
+  recognizer.decode(stream);
+
+  final result = recognizer.getResult(stream);
+  print('Result in $tgtLang: ${result.text}');
+
+  stream.free();
+
+  // Example to change the target language to de
+  if (tgtLang != 'en') {
+    var json = config.toJson();
+
+    ((json['model'] as Map<String, dynamic>)!['canary']
+        as Map<String, dynamic>)!['tgtLang'] = 'en';
+
+    config = sherpa_onnx.OfflineRecognizerConfig.fromJson(json);
+    recognizer.setConfig(config);
+
+    final stream = recognizer.createStream();
+
+    stream.acceptWaveform(
+        samples: waveData.samples, sampleRate: waveData.sampleRate);
+    recognizer.decode(stream);
+
+    final result = recognizer.getResult(stream);
+    print('Result in English: ${result.text}');
+    stream.free();
+  }
+
+  recognizer.free();
+}

dart-api-examples/non-streaming-asr/run-nemo-canary.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+if [ ! -f sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/encoder.int8.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8.tar.bz2
+  tar xvf sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8.tar.bz2
+  rm sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8.tar.bz2
+fi
+
+for tgt_lang in en de es fr; do
+  dart run \
+    ./bin/nemo-canary.dart \
+    --encoder ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/encoder.int8.onnx \
+    --decoder ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/decoder.int8.onnx \
+    --tokens ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/tokens.txt \
+    --src-lang en \
+    --tgt-lang $tgt_lang \
+    --input-wav ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/test_wavs/en.wav
+done
+
+for tgt_lang in en de; do
+  dart run \
+    ./bin/nemo-canary.dart \
+    --encoder ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/encoder.int8.onnx \
+    --decoder ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/decoder.int8.onnx \
+    --tokens ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/tokens.txt \
+    --src-lang de \
+    --tgt-lang $tgt_lang \
+    --input-wav ./sherpa-onnx-nemo-canary-180m-flash-en-es-de-fr-int8/test_wavs/de.wav
+done