89 lines
2.3 KiB
Dart
89 lines
2.3 KiB
Dart
// Copyright (c) 2024 Xiaomi Corporation
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:args/args.dart';
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import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
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import './init.dart';
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void main(List<String> arguments) async {
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await initSherpaOnnx();
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final parser = ArgParser()
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..addOption('model', help: 'Path to the model')
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..addOption('tokens', help: 'Path to tokens.txt')
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..addOption('input-wav', help: 'Path to input.wav to transcribe');
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final res = parser.parse(arguments);
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if (res['model'] == null ||
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res['tokens'] == null ||
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res['input-wav'] == null) {
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print(parser.usage);
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exit(1);
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}
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final model = res['model'] as String;
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final tokens = res['tokens'] as String;
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final inputWav = res['input-wav'] as String;
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final ctc = sherpa_onnx.OnlineZipformer2CtcModelConfig(
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model: model,
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);
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final modelConfig = sherpa_onnx.OnlineModelConfig(
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zipformer2Ctc: ctc,
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tokens: tokens,
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debug: true,
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numThreads: 1,
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);
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final config = sherpa_onnx.OnlineRecognizerConfig(model: modelConfig);
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final recognizer = sherpa_onnx.OnlineRecognizer(config);
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final waveData = sherpa_onnx.readWave(inputWav);
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final stream = recognizer.createStream();
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// simulate streaming. You can choose an arbitrary chunk size.
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// chunkSize of a single sample is also ok, i.e, chunkSize = 1
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final chunkSize = 1600; // 0.1 second for 16kHz
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final numChunks = waveData.samples.length ~/ chunkSize;
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var last = '';
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for (int i = 0; i != numChunks; ++i) {
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int start = i * chunkSize;
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stream.acceptWaveform(
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samples:
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Float32List.sublistView(waveData.samples, start, start + chunkSize),
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sampleRate: waveData.sampleRate,
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);
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while (recognizer.isReady(stream)) {
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recognizer.decode(stream);
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}
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final result = recognizer.getResult(stream);
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if (result.text != last && result.text != '') {
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last = result.text;
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print(last);
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}
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}
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// 0.5 seconds, assume sampleRate is 16kHz
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final tailPaddings = Float32List(8000);
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stream.acceptWaveform(
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samples: tailPaddings,
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sampleRate: waveData.sampleRate,
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);
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while (recognizer.isReady(stream)) {
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recognizer.decode(stream);
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}
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final result = recognizer.getResult(stream);
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if (result.text != '') {
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print(result.text);
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}
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stream.free();
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recognizer.free();
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}
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