Add Dart API for audio tagging (#1181)

.github/scripts/test-dart.sh

@@ -4,6 +4,14 @@ set -ex
 
 cd dart-api-examples
 
+pushd audio-tagging
+echo '----------zipformer----------'
+./run-zipformer.sh
+
+echo '----------ced----------'
+./run-ced.sh
+popd
+
 pushd vad-with-non-streaming-asr
 echo '----------TeleSpeech CTC----------'
 ./run-telespeech-ctc.sh

.github/workflows/test-dart.yaml

@@ -110,6 +110,7 @@ jobs:
           cp scripts/dart/tts-pubspec.yaml dart-api-examples/tts/pubspec.yaml
           cp scripts/dart/kws-pubspec.yaml dart-api-examples/keyword-spotter/pubspec.yaml
           cp scripts/dart/vad-non-streaming-asr-pubspec.yaml dart-api-examples/vad-with-non-streaming-asr/pubspec.yaml
+          cp scripts/dart/audio-tagging-pubspec.yaml dart-api-examples/audio-tagging/pubspec.yaml
 
           cp scripts/dart/sherpa-onnx-pubspec.yaml flutter/sherpa_onnx/pubspec.yaml
 

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.10.20
+
+* Add Dart API for audio tagging
+
 ## 1.10.19
 
 * Prefix all C API functions with SherpaOnnx

README.md

@@ -4,9 +4,13 @@
 |------------------|------------------|----------------------|------------------------|
 |   ✔️              |         ✔️        |          ✔️           |                ✔️       |
 
-| Spoken Language identification | Audio tagging | Voice activity detection | Keyword spotting |
-|--------------------------------|---------------|--------------------------|------------------|
-|                 ✔️              |          ✔️    |                ✔️         |         ✔️        |
+| Spoken Language identification | Audio tagging | Voice activity detection |
+|--------------------------------|---------------|--------------------------|
+|                 ✔️              |          ✔️    |                ✔️         |
+
+| Keyword spotting | Add punctuation |
+|------------------|-----------------|
+|     ✔️            |       ✔️         |
 
 ### Supported platforms
 

dart-api-examples/README.md

@@ -5,7 +5,7 @@ This directory contains examples for Dart API.
 You can find the package at
 https://pub.dev/packages/sherpa_onnx
 
-## Descirption
+## Description
 
 | Directory | Description |
 |-----------|-------------|
@@ -15,6 +15,7 @@ https://pub.dev/packages/sherpa_onnx
 | [./tts](./tts)| Example for text to speech|
 | [./vad](./vad)| Example for voice activity detection|
 | [./vad-with-non-streaming-asr](./vad-with-non-streaming-asr)| Example for voice activity detection with non-streaming speech recognition. You can use it to generate subtitles.|
+| [./audio-tagging](./audio-tagging)| Example for audio tagging.|
 
 ## How to create an example in this folder
 

dart-api-examples/audio-tagging/.gitignore

@@ -0,0 +1,3 @@
+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

dart-api-examples/audio-tagging/README.md

@@ -0,0 +1,8 @@
+# Introduction
+
+This example shows how to use the Dart API from sherpa-onnx for audio tagging.
+
+| File | Description|
+|------|------------|
+|[./bin/zipformer.dart](./bin/zipformer.dart)| Use a Zipformer model for audio tagging. See [./run-zipformer.sh](./run-zipformer.sh)|
+|[./bin/ced.dart](./bin/ced.dart)| Use a [CED](https://github.com/RicherMans/CED) model for audio tagging. See [./run-ced.sh](./run-ced.sh)|

dart-api-examples/audio-tagging/analysis_options.yaml

@@ -0,0 +1,30 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

dart-api-examples/audio-tagging/bin/ced.dart

@@ -0,0 +1,54 @@
+// 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('model', help: 'Path to the zipformer model')
+    ..addOption('labels', help: 'Path to class_labels_indices.csv')
+    ..addOption('top-k', help: 'topK events to be returned', defaultsTo: '5')
+    ..addOption('wav', help: 'Path to test.wav to be tagged');
+
+  final res = parser.parse(arguments);
+  if (res['model'] == null || res['labels'] == null || res['wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final model = res['model'] as String;
+  final labels = res['labels'] as String;
+  final topK = int.tryParse(res['top-k'] as String) ?? 5;
+  final wav = res['wav'] as String;
+
+  final modelConfig = sherpa_onnx.AudioTaggingModelConfig(
+    ced: model,
+    numThreads: 1,
+    debug: true,
+    provider: 'cpu',
+  );
+
+  final config = sherpa_onnx.AudioTaggingConfig(
+    model: modelConfig,
+    labels: labels,
+  );
+
+  final at = sherpa_onnx.AudioTagging(config: config);
+
+  final waveData = sherpa_onnx.readWave(wav);
+
+  final stream = at.createStream();
+  stream.acceptWaveform(
+      samples: waveData.samples, sampleRate: waveData.sampleRate);
+
+  final events = at.compute(stream: stream, topK: topK);
+
+  print(events);
+
+  stream.free();
+  at.free();
+}

dart-api-examples/audio-tagging/bin/init.dart

@@ -0,0 +1 @@
+../../vad/bin/init.dart

dart-api-examples/audio-tagging/bin/zipformer.dart

@@ -0,0 +1,59 @@
+// 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('model', help: 'Path to the zipformer model')
+    ..addOption('labels', help: 'Path to class_labels_indices.csv')
+    ..addOption('top-k', help: 'topK events to be returned', defaultsTo: '5')
+    ..addOption('wav', help: 'Path to test.wav to be tagged');
+
+  final res = parser.parse(arguments);
+  if (res['model'] == null || res['labels'] == null || res['wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final model = res['model'] as String;
+  final labels = res['labels'] as String;
+  final topK = int.tryParse(res['top-k'] as String) ?? 5;
+  final wav = res['wav'] as String;
+
+  final zipformerModelConfig =
+      sherpa_onnx.OfflineZipformerAudioTaggingModelConfig(
+    model: model,
+  );
+
+  final modelConfig = sherpa_onnx.AudioTaggingModelConfig(
+    zipformer: zipformerModelConfig,
+    numThreads: 1,
+    debug: true,
+    provider: 'cpu',
+  );
+
+  final config = sherpa_onnx.AudioTaggingConfig(
+    model: modelConfig,
+    labels: labels,
+  );
+
+  final at = sherpa_onnx.AudioTagging(config: config);
+
+  final waveData = sherpa_onnx.readWave(wav);
+
+  final stream = at.createStream();
+  stream.acceptWaveform(
+      samples: waveData.samples, sampleRate: waveData.sampleRate);
+
+  final events = at.compute(stream: stream, topK: topK);
+
+  print(events);
+
+  stream.free();
+  at.free();
+}

dart-api-examples/audio-tagging/pubspec.yaml

@@ -0,0 +1,17 @@
+name: audio_tagging
+
+description: >
+  This example demonstrates how to use the Dart API for audio tagging.
+
+version: 1.0.0
+
+environment:
+  sdk: ^3.4.0
+
+dependencies:
+  sherpa_onnx: ^1.10.19
+  path: ^1.9.0
+  args: ^2.5.0
+
+dev_dependencies:
+  lints: ^3.0.0

dart-api-examples/audio-tagging/run-ced.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+if [[ ! -f ./sherpa-onnx-ced-mini-audio-tagging-2024-04-19/model.onnx ]]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/audio-tagging-models/sherpa-onnx-ced-mini-audio-tagging-2024-04-19.tar.bz2
+  tar xvf sherpa-onnx-ced-mini-audio-tagging-2024-04-19.tar.bz2
+  rm sherpa-onnx-ced-mini-audio-tagging-2024-04-19.tar.bz2
+fi
+
+for w in 1 2 3 4 5 6; do
+  dart run \
+    ./bin/ced.dart \
+    --model ./sherpa-onnx-ced-mini-audio-tagging-2024-04-19/model.int8.onnx \
+    --labels ./sherpa-onnx-ced-mini-audio-tagging-2024-04-19/class_labels_indices.csv \
+    --wav ./sherpa-onnx-ced-mini-audio-tagging-2024-04-19/test_wavs/$w.wav
+done

dart-api-examples/audio-tagging/run-zipformer.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+if [[ ! -f ./sherpa-onnx-zipformer-audio-tagging-2024-04-09/model.onnx ]]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/audio-tagging-models/sherpa-onnx-zipformer-audio-tagging-2024-04-09.tar.bz2
+  tar xvf sherpa-onnx-zipformer-audio-tagging-2024-04-09.tar.bz2
+  rm sherpa-onnx-zipformer-audio-tagging-2024-04-09.tar.bz2
+fi
+
+for w in 1 2 3 4 5 6; do
+  dart run \
+    ./bin/zipformer.dart \
+    --model ./sherpa-onnx-zipformer-audio-tagging-2024-04-09/model.int8.onnx \
+    --labels ./sherpa-onnx-zipformer-audio-tagging-2024-04-09/class_labels_indices.csv \
+    --wav ./sherpa-onnx-zipformer-audio-tagging-2024-04-09/test_wavs/$w.wav
+done

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

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

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

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

dart-api-examples/non-streaming-asr/bin/paraformer-itn.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

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

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

dart-api-examples/non-streaming-asr/bin/sense-voice.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

dart-api-examples/non-streaming-asr/bin/telespeech-ctc.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

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

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

dart-api-examples/non-streaming-asr/bin/zipformer-transducer.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;

dart-api-examples/tts/bin/coqui.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
@@ -65,5 +64,5 @@ void main(List<String> arguments) async {
     samples: audio.samples,
     sampleRate: audio.sampleRate,
   );
-  print('Saved to ${outputWav}');
+  print('Saved to $outputWav');
 }

dart-api-examples/tts/bin/piper.dart

@@ -80,5 +80,5 @@ void main(List<String> arguments) async {
     samples: audio.samples,
     sampleRate: audio.sampleRate,
   );
-  print('Saved to ${outputWav}');
+  print('Saved to $outputWav');
 }

dart-api-examples/tts/bin/zh.dart

@@ -1,6 +1,5 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:args/args.dart';
 import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
@@ -82,5 +81,5 @@ void main(List<String> arguments) async {
     samples: audio.samples,
     sampleRate: audio.sampleRate,
   );
-  print('Saved to ${outputWav}');
+  print('Saved to $outputWav');
 }

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

@@ -77,5 +77,5 @@ void main(List<String> arguments) async {
   sherpa_onnx.writeWave(
       filename: outputWav, samples: s, sampleRate: waveData.sampleRate);
 
-  print('Saved to ${outputWav}');
+  print('Saved to $outputWav');
 }

flutter/sherpa_onnx/lib/sherpa_onnx.dart

@@ -2,6 +2,7 @@
 import 'dart:io';
 import 'dart:ffi';
 
+export 'src/audio_tagging.dart';
 export 'src/feature_config.dart';
 export 'src/keyword_spotter.dart';
 export 'src/offline_recognizer.dart';

flutter/sherpa_onnx/lib/src/audio_tagging.dart

@@ -0,0 +1,144 @@
+// Copyright (c)  2024  Xiaomi Corporation
+import 'dart:ffi';
+import 'package:ffi/ffi.dart';
+
+import './offline_stream.dart';
+import './sherpa_onnx_bindings.dart';
+
+class OfflineZipformerAudioTaggingModelConfig {
+  const OfflineZipformerAudioTaggingModelConfig({this.model = ''});
+
+  @override
+  String toString() {
+    return 'OfflineZipformerAudioTaggingModelConfig(model: $model)';
+  }
+
+  final String model;
+}
+
+class AudioTaggingModelConfig {
+  AudioTaggingModelConfig(
+      {this.zipformer = const OfflineZipformerAudioTaggingModelConfig(),
+      this.ced = '',
+      this.numThreads = 1,
+      this.provider = 'cpu',
+      this.debug = true});
+
+  @override
+  String toString() {
+    return 'AudioTaggingModelConfig(zipformer: $zipformer, ced: $ced, numThreads: $numThreads, provider: $provider, debug: $debug)';
+  }
+
+  final OfflineZipformerAudioTaggingModelConfig zipformer;
+  final String ced;
+  final int numThreads;
+  final String provider;
+  final bool debug;
+}
+
+class AudioTaggingConfig {
+  AudioTaggingConfig({required this.model, this.labels = ''});
+
+  @override
+  String toString() {
+    return 'AudioTaggingConfig(model: $model, labels: $labels)';
+  }
+
+  final AudioTaggingModelConfig model;
+  final String labels;
+}
+
+class AudioEvent {
+  AudioEvent({required this.name, required this.index, required this.prob});
+
+  @override
+  String toString() {
+    return 'AudioEvent(name: $name, index: $index, prob: $prob)';
+  }
+
+  final String name;
+  final int index;
+  final double prob;
+}
+
+class AudioTagging {
+  AudioTagging._({required this.ptr, required this.config});
+
+  // The user has to invoke AudioTagging.free() to avoid memory leak.
+  factory AudioTagging({required AudioTaggingConfig config}) {
+    final c = calloc<SherpaOnnxAudioTaggingConfig>();
+
+    final zipformerPtr = config.model.zipformer.model.toNativeUtf8();
+    c.ref.model.zipformer.model = zipformerPtr;
+
+    final cedPtr = config.model.ced.toNativeUtf8();
+    c.ref.model.ced = cedPtr;
+
+    c.ref.model.numThreads = config.model.numThreads;
+
+    final providerPtr = config.model.provider.toNativeUtf8();
+    c.ref.model.provider = providerPtr;
+
+    c.ref.model.debug = config.model.debug ? 1 : 0;
+
+    final labelsPtr = config.labels.toNativeUtf8();
+    c.ref.labels = labelsPtr;
+
+    final ptr =
+        SherpaOnnxBindings.sherpaOnnxCreateAudioTagging?.call(c) ?? nullptr;
+
+    calloc.free(labelsPtr);
+    calloc.free(providerPtr);
+    calloc.free(cedPtr);
+    calloc.free(zipformerPtr);
+    calloc.free(c);
+
+    return AudioTagging._(ptr: ptr, config: config);
+  }
+
+  void free() {
+    SherpaOnnxBindings.sherpaOnnxDestroyAudioTagging?.call(ptr);
+    ptr = nullptr;
+  }
+
+  /// The user has to invoke stream.free() on the returned instance
+  /// to avoid memory leak
+  OfflineStream createStream() {
+    final p = SherpaOnnxBindings.sherpaOnnxAudioTaggingCreateOfflineStream
+            ?.call(ptr) ??
+        nullptr;
+    return OfflineStream(ptr: p);
+  }
+
+  List<AudioEvent> compute({required OfflineStream stream, required int topK}) {
+    final pp = SherpaOnnxBindings.sherpaOnnxAudioTaggingCompute
+            ?.call(ptr, stream.ptr, topK) ??
+        nullptr;
+
+    final ans = <AudioEvent>[];
+
+    if (pp == nullptr) {
+      return ans;
+    }
+
+    var i = 0;
+    while (pp[i] != nullptr) {
+      final p = pp[i];
+
+      final name = p.ref.name.toDartString();
+      final index = p.ref.index;
+      final prob = p.ref.prob;
+      final e = AudioEvent(name: name, index: index, prob: prob);
+      ans.add(e);
+
+      i += 1;
+    }
+
+    SherpaOnnxBindings.sherpaOnnxAudioTaggingFreeResults?.call(pp);
+
+    return ans;
+  }
+
+  Pointer<SherpaOnnxAudioTagging> ptr;
+  final AudioTaggingConfig config;
+}

flutter/sherpa_onnx/lib/src/sherpa_onnx_bindings.dart

@@ -2,6 +2,41 @@
 import 'dart:ffi';
 import 'package:ffi/ffi.dart';
 
+final class SherpaOnnxOfflineZipformerAudioTaggingModelConfig extends Struct {
+  external Pointer<Utf8> model;
+}
+
+final class SherpaOnnxAudioTaggingModelConfig extends Struct {
+  external SherpaOnnxOfflineZipformerAudioTaggingModelConfig zipformer;
+  external Pointer<Utf8> ced;
+
+  @Int32()
+  external int numThreads;
+
+  @Int32()
+  external int debug;
+
+  external Pointer<Utf8> provider;
+}
+
+final class SherpaOnnxAudioTaggingConfig extends Struct {
+  external SherpaOnnxAudioTaggingModelConfig model;
+  external Pointer<Utf8> labels;
+
+  @Int32()
+  external int topK;
+}
+
+final class SherpaOnnxAudioEvent extends Struct {
+  external Pointer<Utf8> name;
+
+  @Int32()
+  external int index;
+
+  @Float()
+  external double prob;
+}
+
 final class SherpaOnnxOfflineTtsVitsModelConfig extends Struct {
   external Pointer<Utf8> model;
   external Pointer<Utf8> lexicon;
@@ -303,6 +338,8 @@ final class SherpaOnnxKeywordSpotterConfig extends Struct {
   external Pointer<Utf8> keywordsFile;
 }
 
+final class SherpaOnnxAudioTagging extends Opaque {}
+
 final class SherpaOnnxKeywordSpotter extends Opaque {}
 
 final class SherpaOnnxOfflineTts extends Opaque {}
@@ -323,6 +360,40 @@ final class SherpaOnnxSpeakerEmbeddingExtractor extends Opaque {}
 
 final class SherpaOnnxSpeakerEmbeddingManager extends Opaque {}
 
+typedef SherpaOnnxCreateAudioTaggingNative = Pointer<SherpaOnnxAudioTagging>
+    Function(Pointer<SherpaOnnxAudioTaggingConfig>);
+
+typedef SherpaOnnxCreateAudioTagging = SherpaOnnxCreateAudioTaggingNative;
+
+typedef SherpaOnnxDestroyAudioTaggingNative = Void Function(
+    Pointer<SherpaOnnxAudioTagging>);
+
+typedef SherpaOnnxDestroyAudioTagging = void Function(
+    Pointer<SherpaOnnxAudioTagging>);
+
+typedef SherpaOnnxAudioTaggingCreateOfflineStreamNative
+    = Pointer<SherpaOnnxOfflineStream> Function(
+        Pointer<SherpaOnnxAudioTagging>);
+
+typedef SherpaOnnxAudioTaggingCreateOfflineStream
+    = SherpaOnnxAudioTaggingCreateOfflineStreamNative;
+
+typedef SherpaOnnxAudioTaggingComputeNative
+    = Pointer<Pointer<SherpaOnnxAudioEvent>> Function(
+        Pointer<SherpaOnnxAudioTagging>,
+        Pointer<SherpaOnnxOfflineStream>,
+        Int32);
+
+typedef SherpaOnnxAudioTaggingCompute
+    = Pointer<Pointer<SherpaOnnxAudioEvent>> Function(
+        Pointer<SherpaOnnxAudioTagging>, Pointer<SherpaOnnxOfflineStream>, int);
+
+typedef SherpaOnnxAudioTaggingFreeResultsNative = Void Function(
+    Pointer<Pointer<SherpaOnnxAudioEvent>>);
+
+typedef SherpaOnnxAudioTaggingFreeResults = void Function(
+    Pointer<Pointer<SherpaOnnxAudioEvent>>);
+
 typedef CreateKeywordSpotterNative = Pointer<SherpaOnnxKeywordSpotter> Function(
     Pointer<SherpaOnnxKeywordSpotterConfig>);
 
@@ -804,6 +875,13 @@ typedef SherpaOnnxFreeWaveNative = Void Function(Pointer<SherpaOnnxWave>);
 typedef SherpaOnnxFreeWave = void Function(Pointer<SherpaOnnxWave>);
 
 class SherpaOnnxBindings {
+  static SherpaOnnxCreateAudioTagging? sherpaOnnxCreateAudioTagging;
+  static SherpaOnnxDestroyAudioTagging? sherpaOnnxDestroyAudioTagging;
+  static SherpaOnnxAudioTaggingCreateOfflineStream?
+      sherpaOnnxAudioTaggingCreateOfflineStream;
+  static SherpaOnnxAudioTaggingCompute? sherpaOnnxAudioTaggingCompute;
+  static SherpaOnnxAudioTaggingFreeResults? sherpaOnnxAudioTaggingFreeResults;
+
   static CreateKeywordSpotter? createKeywordSpotter;
   static DestroyKeywordSpotter? destroyKeywordSpotter;
   static CreateKeywordStream? createKeywordStream;
@@ -958,6 +1036,33 @@ class SherpaOnnxBindings {
   static SherpaOnnxFreeWave? freeWave;
 
   static void init(DynamicLibrary dynamicLibrary) {
+    sherpaOnnxCreateAudioTagging ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxCreateAudioTaggingNative>>(
+            'SherpaOnnxCreateAudioTagging')
+        .asFunction();
+
+    sherpaOnnxDestroyAudioTagging ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxDestroyAudioTaggingNative>>(
+            'SherpaOnnxDestroyAudioTagging')
+        .asFunction();
+
+    sherpaOnnxAudioTaggingCreateOfflineStream ??= dynamicLibrary
+        .lookup<
+                NativeFunction<
+                    SherpaOnnxAudioTaggingCreateOfflineStreamNative>>(
+            'SherpaOnnxAudioTaggingCreateOfflineStream')
+        .asFunction();
+
+    sherpaOnnxAudioTaggingCompute ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxAudioTaggingComputeNative>>(
+            'SherpaOnnxAudioTaggingCompute')
+        .asFunction();
+
+    sherpaOnnxAudioTaggingFreeResults ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxAudioTaggingFreeResultsNative>>(
+            'SherpaOnnxAudioTaggingFreeResults')
+        .asFunction();
+
     createKeywordSpotter ??= dynamicLibrary
         .lookup<NativeFunction<CreateKeywordSpotterNative>>(
             'SherpaOnnxCreateKeywordSpotter')

scripts/dart/audio-tagging-pubspec.yaml

@@ -0,0 +1,18 @@
+name: audio_tagging
+
+description: >
+  This example demonstrates how to use the Dart API for audio tagging.
+
+version: 1.0.0
+
+environment:
+  sdk: ^3.4.0
+
+dependencies:
+  sherpa_onnx:
+    path: ../../flutter/sherpa_onnx
+  path: ^1.9.0
+  args: ^2.5.0
+
+dev_dependencies:
+  lints: ^3.0.0