Add Dart API for Moonshine models. (#1481)

dart-api-examples/non-streaming-asr/bin/moonshine.dart

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+// Copyright (c)  2024  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('preprocessor',
+        help: 'Path to the moonshine preprocessor model')
+    ..addOption('encoder', help: 'Path to the moonshine encoder model')
+    ..addOption('uncached-decoder',
+        help: 'Path to moonshine uncached decoder model')
+    ..addOption('cached-decoder',
+        help: 'Path to moonshine cached decoder model')
+    ..addOption('tokens', help: 'Path to tokens.txt')
+    ..addOption('input-wav', help: 'Path to input.wav to transcribe');
+
+  final res = parser.parse(arguments);
+  if (res['preprocessor'] == null ||
+      res['encoder'] == null ||
+      res['uncached-decoder'] == null ||
+      res['cached-decoder'] == null ||
+      res['tokens'] == null ||
+      res['input-wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final preprocessor = res['preprocessor'] as String;
+  final encoder = res['encoder'] as String;
+  final uncachedDecoder = res['uncached-decoder'] as String;
+  final cachedDecoder = res['cached-decoder'] as String;
+  final tokens = res['tokens'] as String;
+  final inputWav = res['input-wav'] as String;
+
+  final moonshine = sherpa_onnx.OfflineMoonshineModelConfig(
+    preprocessor: preprocessor,
+    encoder: encoder,
+    uncachedDecoder: uncachedDecoder,
+    cachedDecoder: cachedDecoder,
+  );
+
+  final modelConfig = sherpa_onnx.OfflineModelConfig(
+    moonshine: moonshine,
+    tokens: tokens,
+    debug: false,
+    numThreads: 1,
+  );
+  final 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.text);
+
+  stream.free();
+  recognizer.free();
+}

dart-api-examples/non-streaming-asr/run-moonshine.sh

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+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+if [ ! -f ./sherpa-onnx-moonshine-tiny-en-int8/tokens.txt ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
+  tar xvf sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
+  rm sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
+fi
+
+dart run \
+  ./bin/moonshine.dart \
+  --preprocessor ./sherpa-onnx-moonshine-tiny-en-int8/preprocess.onnx \
+  --encoder ./sherpa-onnx-moonshine-tiny-en-int8/encode.int8.onnx \
+  --uncached-decoder ./sherpa-onnx-moonshine-tiny-en-int8/uncached_decode.int8.onnx \
+  --cached-decoder ./sherpa-onnx-moonshine-tiny-en-int8/cached_decode.int8.onnx \
+  --tokens ./sherpa-onnx-moonshine-tiny-en-int8/tokens.txt \
+  --input-wav ./sherpa-onnx-moonshine-tiny-en-int8/test_wavs/0.wav