Add VAD example for Dart API (#996)

2024-06-14 10:37:16 +08:00
parent c214d8fb74
commit d08cc04567
33 changed files with 883 additions and 142 deletions
--- a/.github/workflows/build-wheels-macos-arm64.yaml
+++ b/.github/workflows/build-wheels-macos-arm64.yaml
@@ -48,7 +48,7 @@ jobs:
          path: ./wheelhouse/*.whl

      - name: Publish to huggingface
-        if: matrix.python-version == 'cp38'
+        if: matrix.python-version == 'cp39'
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
        uses: nick-fields/retry@v3
@@ -82,7 +82,13 @@ jobs:
          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
        run: |
-          python3 -m pip install --break-system-packages --upgrade pip
-          python3 -m pip install --break-system-packages wheel twine setuptools
+          opts='--break-system-packages'
+          v=${{ matrix.python-version }}
+          if [[ $v == cp38 || $v == cp39 ]]; then
+            opts=''
+          fi
+
+          python3 -m pip install $opts --upgrade pip
+          python3 -m pip install $opts wheel twine setuptools

          twine upload ./wheelhouse/*.whl
--- a/.github/workflows/build-wheels-macos-universal2.yaml
+++ b/.github/workflows/build-wheels-macos-universal2.yaml
@@ -50,7 +50,7 @@ jobs:
          path: ./wheelhouse/*.whl

      - name: Publish to huggingface
-        if: matrix.python-version == 'cp38'
+        if: matrix.python-version == 'cp39'
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
        uses: nick-fields/retry@v3
--- a/.github/workflows/build-wheels-macos-x64.yaml
+++ b/.github/workflows/build-wheels-macos-x64.yaml
@@ -65,7 +65,7 @@ jobs:
          path: ./wheelhouse/*.whl

      - name: Publish to huggingface
-        if: matrix.python-version == 'cp38'
+        if: matrix.python-version == 'cp39'
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
        uses: nick-fields/retry@v3
@@ -99,7 +99,13 @@ jobs:
          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
        run: |
-          python3 -m pip install --break-system-packages --upgrade pip
-          python3 -m pip install --break-system-packages wheel twine setuptools
+          opts='--break-system-packages'
+          v=${{ matrix.python-version }}
+          if [[ $v == cp38 || $v == cp39 ]]; then
+            opts=''
+          fi
+
+          python3 -m pip install $opts --upgrade pip
+          python3 -m pip install $opts wheel twine setuptools

          twine upload ./wheelhouse/*.whl
--- a/.github/workflows/flutter-macos.yaml
+++ b/.github/workflows/flutter-macos.yaml
@@ -152,6 +152,8 @@ jobs:
      - name: Build flutter
        shell: bash
        run: |
+          SHERPA_ONNX_VERSION=v$(grep "SHERPA_ONNX_VERSION" ./CMakeLists.txt  | cut -d " " -f 2  | cut -d '"' -f 2)
+
          d=$PWD

          pushd sherpa-onnx/flutter
@@ -166,7 +168,7 @@ jobs:

          tree ./sherpa_onnx.app

-          app=flutter_sherpa_onnx_macos_${{ matrix.arch }}.app
+          app=sherpa-onnx-osx-${{ matrix.arch }}-$SHERPA_ONNX_VERSION.app
          mv sherpa_onnx.app $app
          tar cjfv $app.tar.bz2 $app
          ls -lh
@@ -178,13 +180,43 @@ jobs:

      - uses: actions/upload-artifact@v4
        with:
-          name: flutter-sherpa-onnx-app-macos-${{ matrix.arch }}
+          name: sherpa-onnx-osx-${{ matrix.arch }}
          path: ./*.tar.bz2

-      - name: Release android libs
-        if: (github.repository_owner == 'csukuangfj' || github.repository_owner == 'k2-fsa') && github.event_name == 'push' && contains(github.ref, 'refs/tags/')
-        uses: svenstaro/upload-release-action@v2
+      - name: Publish to huggingface
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        uses: nick-fields/retry@v3
        with:
-          file_glob: true
-          overwrite: true
-          file: flutter*.tar.bz2
+          max_attempts: 20
+          timeout_seconds: 200
+          shell: bash
+          command: |
+            git config --global user.email "csukuangfj@gmail.com"
+            git config --global user.name "Fangjun Kuang"
+
+            rm -rf huggingface
+            export GIT_LFS_SKIP_SMUDGE=1
+            export GIT_CLONE_PROTECTION_ACTIVE=false
+
+            git clone https://huggingface.co/csukuangfj/sherpa-onnx-flutter huggingface
+            cd huggingface
+            git fetch
+            git pull
+            git merge -m "merge remote" --ff origin main
+            mkdir -p flutter
+            cp -v ../*.tar.bz2 ./flutter
+
+            git status
+            git lfs track "*.bz2"
+            git add .
+            git commit -m "add more files"
+            git push https://csukuangfj:$HF_TOKEN@huggingface.co/csukuangfj/sherpa-onnx-flutter main
+
+      # - name: Release android libs
+      #   if: (github.repository_owner == 'csukuangfj' || github.repository_owner == 'k2-fsa') && github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+      #   uses: svenstaro/upload-release-action@v2
+      #   with:
+      #     file_glob: true
+      #     overwrite: true
+      #     file: sherpa*.tar.bz2
--- a/.github/workflows/flutter-windows-x64.yaml
+++ b/.github/workflows/flutter-windows-x64.yaml
@@ -142,7 +142,7 @@ jobs:

          cd build/windows/x64/runner/

-          dst=flutter_sherpa_onnx_windows_x64
+          dst=sherpa-onnx-win-x64-$SHERPA_ONNX_VERSION
          mv Release $dst

          tar cjfv $dst.tar.bz2 ./$dst
@@ -155,13 +155,43 @@ jobs:

      - uses: actions/upload-artifact@v4
        with:
-          name: flutter-sherpa-onnx-windows-x64
+          name: sherpa-onnx-win-x64
          path: ./*.tar.bz2

-      - name: Release android libs
-        if: (github.repository_owner == 'csukuangfj' || github.repository_owner == 'k2-fsa') && github.event_name == 'push' && contains(github.ref, 'refs/tags/')
-        uses: svenstaro/upload-release-action@v2
+      - name: Publish to huggingface
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        uses: nick-fields/retry@v3
        with:
-          file_glob: true
-          overwrite: true
-          file: flutter*.tar.bz2
+          max_attempts: 20
+          timeout_seconds: 200
+          shell: bash
+          command: |
+            git config --global user.email "csukuangfj@gmail.com"
+            git config --global user.name "Fangjun Kuang"
+
+            rm -rf huggingface
+            export GIT_LFS_SKIP_SMUDGE=1
+            export GIT_CLONE_PROTECTION_ACTIVE=false
+
+            git clone https://huggingface.co/csukuangfj/sherpa-onnx-flutter huggingface
+            cd huggingface
+            git fetch
+            git pull
+            git merge -m "merge remote" --ff origin main
+            mkdir -p flutter
+            cp -v ../*.tar.bz2 ./flutter
+
+            git status
+            git lfs track "*.bz2"
+            git add .
+            git commit -m "add more files"
+            git push https://csukuangfj:$HF_TOKEN@huggingface.co/csukuangfj/sherpa-onnx-flutter main
+
+      # - name: Release android libs
+      #   if: (github.repository_owner == 'csukuangfj' || github.repository_owner == 'k2-fsa') && github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+      #   uses: svenstaro/upload-release-action@v2
+      #   with:
+      #     file_glob: true
+      #     overwrite: true
+      #     file: sherpa*.tar.bz2
--- a/.github/workflows/test-dart.yaml
+++ b/.github/workflows/test-dart.yaml
@@ -0,0 +1,60 @@
+name: test-dart
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/test-dart.yaml'
+      - 'dart-api-examples/**'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/test-dart.yaml'
+      - 'dart-api-examples/**'
+
+  workflow_dispatch:
+
+concurrency:
+  group: test-dart-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  dart:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest] #, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Flutter SDK
+        uses: flutter-actions/setup-flutter@v3
+        with:
+          channel: stable
+          version: latest
+
+      - name: Display flutter info
+        shell: bash
+        run: |
+          which flutter
+          which dart
+
+          flutter --version
+          dart --version
+          flutter doctor
+
+      - name: Run tests
+        shell: bash
+        run: |
+          cd dart-api-examples
+
+          pushd vad
+          ./run.sh
+          popd
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,10 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET "10.14" CACHE STRING "Minimum OS X deployment ve

 project(sherpa-onnx)

-set(SHERPA_ONNX_VERSION "1.9.28")
+# Remember to update
+# ./nodejs-addon-examples
+# ./dart-api-examples/
+set(SHERPA_ONNX_VERSION "1.9.29")

 # Disable warning about
 #
--- a/cmake/cmake_extension.py
+++ b/cmake/cmake_extension.py
@@ -84,9 +84,9 @@ def get_binaries():
            "piper_phonemize.dll",
            "sherpa-onnx-c-api.dll",
            "sherpa-onnx-core.dll",
-            "sherpa-onnx-fstfar.lib",
-            "sherpa-onnx-fst.lib",
-            "sherpa-onnx-kaldifst-core.lib",
+            "sherpa-onnx-fstfar.dll",
+            "sherpa-onnx-fst.dll",
+            "sherpa-onnx-kaldifst-core.dll",
            "sherpa-onnx-portaudio.dll",
            "ucd.dll",
        ]
@@ -211,7 +211,7 @@ class BuildExtension(build_ext):
        binaries = get_binaries()

        for f in binaries:
-            suffix = "" if (".dll" in f or ".lib" in f) else suffix
+            suffix = "" if ".dll" in f else suffix
            src_file = install_dir / "bin" / (f + suffix)
            if not src_file.is_file():
                src_file = install_dir / "lib" / (f + suffix)
--- a/cmake/kaldi-decoder.cmake
+++ b/cmake/kaldi-decoder.cmake
@@ -1,9 +1,9 @@
 function(download_kaldi_decoder)
  include(FetchContent)

-  set(kaldi_decoder_URL  "https://github.com/k2-fsa/kaldi-decoder/archive/refs/tags/v0.2.5.tar.gz")
-  set(kaldi_decoder_URL2 "https://hub.nuaa.cf/k2-fsa/kaldi-decoder/archive/refs/tags/v0.2.5.tar.gz")
-  set(kaldi_decoder_HASH "SHA256=f663e58aef31b33cd8086eaa09ff1383628039845f31300b5abef817d8cc2fff")
+  set(kaldi_decoder_URL  "https://github.com/k2-fsa/kaldi-decoder/archive/refs/tags/v0.2.6.tar.gz")
+  set(kaldi_decoder_URL2 "https://hub.nuaa.cf/k2-fsa/kaldi-decoder/archive/refs/tags/v0.2.6.tar.gz")
+  set(kaldi_decoder_HASH "SHA256=b13c78b37495cafc6ef3f8a7b661b349c55a51abbd7f7f42f389408dcf86a463")

  set(KALDI_DECODER_BUILD_PYTHON OFF CACHE BOOL "" FORCE)
  set(KALDI_DECODER_ENABLE_TESTS OFF CACHE BOOL "" FORCE)
@@ -12,11 +12,11 @@ function(download_kaldi_decoder)
  # If you don't have access to the Internet,
  # please pre-download kaldi-decoder
  set(possible_file_locations
-    $ENV{HOME}/Downloads/kaldi-decoder-0.2.5.tar.gz
-    ${CMAKE_SOURCE_DIR}/kaldi-decoder-0.2.5.tar.gz
-    ${CMAKE_BINARY_DIR}/kaldi-decoder-0.2.5.tar.gz
-    /tmp/kaldi-decoder-0.2.5.tar.gz
-    /star-fj/fangjun/download/github/kaldi-decoder-0.2.5.tar.gz
+    $ENV{HOME}/Downloads/kaldi-decoder-0.2.6.tar.gz
+    ${CMAKE_SOURCE_DIR}/kaldi-decoder-0.2.6.tar.gz
+    ${CMAKE_BINARY_DIR}/kaldi-decoder-0.2.6.tar.gz
+    /tmp/kaldi-decoder-0.2.6.tar.gz
+    /star-fj/fangjun/download/github/kaldi-decoder-0.2.6.tar.gz
  )

  foreach(f IN LISTS possible_file_locations)
--- a/cmake/kaldifst.cmake
+++ b/cmake/kaldifst.cmake
@@ -1,18 +1,18 @@
 function(download_kaldifst)
  include(FetchContent)

-  set(kaldifst_URL  "https://github.com/k2-fsa/kaldifst/archive/refs/tags/v1.7.10.tar.gz")
-  set(kaldifst_URL2 "https://hub.nuaa.cf/k2-fsa/kaldifst/archive/refs/tags/v1.7.10.tar.gz")
-  set(kaldifst_HASH "SHA256=7f7b3173a6584a6b1987f65ae7af2ac453d66b845f875a9d31074b8d2cd0de54")
+  set(kaldifst_URL  "https://github.com/k2-fsa/kaldifst/archive/refs/tags/v1.7.11.tar.gz")
+  set(kaldifst_URL2 "https://hub.nuaa.cf/k2-fsa/kaldifst/archive/refs/tags/v1.7.11.tar.gz")
+  set(kaldifst_HASH "SHA256=b43b3332faa2961edc730e47995a58cd4e22ead21905d55b0c4a41375b4a525f")

  # If you don't have access to the Internet,
  # please pre-download kaldifst
  set(possible_file_locations
-    $ENV{HOME}/Downloads/kaldifst-1.7.10.tar.gz
-    ${CMAKE_SOURCE_DIR}/kaldifst-1.7.10.tar.gz
-    ${CMAKE_BINARY_DIR}/kaldifst-1.7.10.tar.gz
-    /tmp/kaldifst-1.7.10.tar.gz
-    /star-fj/fangjun/download/github/kaldifst-1.7.10.tar.gz
+    $ENV{HOME}/Downloads/kaldifst-1.7.11.tar.gz
+    ${CMAKE_SOURCE_DIR}/kaldifst-1.7.11.tar.gz
+    ${CMAKE_BINARY_DIR}/kaldifst-1.7.11.tar.gz
+    /tmp/kaldifst-1.7.11.tar.gz
+    /star-fj/fangjun/download/github/kaldifst-1.7.11.tar.gz
  )

  foreach(f IN LISTS possible_file_locations)
@@ -51,6 +51,7 @@ function(download_kaldifst)
  )

  set_target_properties(kaldifst_core PROPERTIES OUTPUT_NAME "sherpa-onnx-kaldifst-core")
+  # installed in ./kaldi-decoder.cmake
 endfunction()

 download_kaldifst()
--- a/cmake/openfst.cmake
+++ b/cmake/openfst.cmake
@@ -3,18 +3,18 @@
 function(download_openfst)
  include(FetchContent)

-  set(openfst_URL  "https://github.com/csukuangfj/openfst/archive/refs/tags/sherpa-onnx-2024-05-22-2.tar.gz")
-  set(openfst_URL2 "https://hub.nuaa.cf/csukuangfj/openfst/archive/refs/tags/sherpa-onnx-2024-05-22-2.tar.gz")
-  set(openfst_HASH "SHA256=ec52d32ab46ac884d77c87918155ca9d0cae424095ce3bd7e3cc7eaab8235a39")
+  set(openfst_URL  "https://github.com/csukuangfj/openfst/archive/refs/tags/sherpa-onnx-2024-06-13.tar.gz")
+  set(openfst_URL2 "https://hub.nuaa.cf/csukuangfj/openfst/archive/refs/tags/sherpa-onnx-2024-06-13.tar.gz")
+  set(openfst_HASH "SHA256=f10a71c6b64d89eabdc316d372b956c30c825c7c298e2f20c780320e8181ffb6")

  # If you don't have access to the Internet,
  # please pre-download it
  set(possible_file_locations
-    $ENV{HOME}/Downloads/openfst-sherpa-onnx-2024-05-22-2.tar.gz
-    ${CMAKE_SOURCE_DIR}/openfst-sherpa-onnx-2024-05-22-2.tar.gz
-    ${CMAKE_BINARY_DIR}/openfst-sherpa-onnx-2024-05-22-2.tar.gz
-    /tmp/openfst-sherpa-onnx-2024-05-22-2.tar.gz
-    /star-fj/fangjun/download/github/openfst-sherpa-onnx-2024-05-22-2.tar.gz
+    $ENV{HOME}/Downloads/openfst-sherpa-onnx-2024-06-13.tar.gz
+    ${CMAKE_SOURCE_DIR}/openfst-sherpa-onnx-2024-06-13.tar.gz
+    ${CMAKE_BINARY_DIR}/openfst-sherpa-onnx-2024-06-13.tar.gz
+    /tmp/openfst-sherpa-onnx-2024-06-13.tar.gz
+    /star-fj/fangjun/download/github/openfst-sherpa-onnx-2024-06-13.tar.gz
  )

  foreach(f IN LISTS possible_file_locations)
@@ -27,7 +27,7 @@ function(download_openfst)
  endforeach()

  set(HAVE_BIN OFF CACHE BOOL "" FORCE)
-  set(HAVE_SCRIPT ON CACHE BOOL "" FORCE)
+  set(HAVE_SCRIPT OFF CACHE BOOL "" FORCE)
  set(HAVE_COMPACT OFF CACHE BOOL "" FORCE)
  set(HAVE_COMPRESS OFF CACHE BOOL "" FORCE)
  set(HAVE_CONST OFF CACHE BOOL "" FORCE)
@@ -70,8 +70,6 @@ function(download_openfst)
  add_subdirectory(${openfst_SOURCE_DIR} ${openfst_BINARY_DIR} EXCLUDE_FROM_ALL)
  set(openfst_SOURCE_DIR ${openfst_SOURCE_DIR} PARENT_SCOPE)

-  # Rename libfst.so.6 to libsherpa-onnx-fst.so.6 to avoid potential conflicts
-  # when sherpa-onnx is installed.
  set_target_properties(fst PROPERTIES OUTPUT_NAME "sherpa-onnx-fst")
  set_target_properties(fstfar PROPERTIES OUTPUT_NAME "sherpa-onnx-fstfar")

--- a/dart-api-examples/README.md
+++ b/dart-api-examples/README.md
@@ -0,0 +1,18 @@
+# Introduction
+
+This directory contains examples for Dart API.
+
+You can find the package at
+https://pub.dev/packages/sherpa_onnx
+
+## How to create an example in this folder
+
+```bash
+dart create vad
+cd vad
+
+# Edit pubspec.yaml and add sherpa_onnx to dependencies
+
+dart pub get
+dart run
+```
--- a/dart-api-examples/vad/.gitignore
+++ b/dart-api-examples/vad/.gitignore
@@ -0,0 +1,3 @@
+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
--- a/dart-api-examples/vad/CHANGELOG.md
+++ b/dart-api-examples/vad/CHANGELOG.md
@@ -0,0 +1,3 @@
+## 1.0.0
+
+- Initial version.
--- a/dart-api-examples/vad/README.md
+++ b/dart-api-examples/vad/README.md
@@ -0,0 +1,21 @@
+# Introduction
+
+This example shows how to use the Dart API from sherpa-onnx for voice activity detection (VAD).
+Specifically, we use VAD to remove silences from a wave file.
+
+# Usage
+
+```bash
+dart pub get
+
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/silero_vad.onnx
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/lei-jun-test.wav
+
+dart run \
+  ./bin/vad.dart \
+  --silero-vad ./silero_vad.onnx \
+  --input-wav ./lei-jun-test.wav \
+  --output-wav ./lei-jun-test-no-silence.wav
+```
+
+It should generate a file `lei-jun-test-no-silence.wav`, where silences are removed.
--- a/dart-api-examples/vad/analysis_options.yaml
+++ b/dart-api-examples/vad/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
--- a/dart-api-examples/vad/bin/vad.dart
+++ b/dart-api-examples/vad/bin/vad.dart
@@ -0,0 +1,93 @@
+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);
+}
+
+void main(List<String> arguments) async {
+  await initSherpaOnnx();
+
+  final parser = ArgParser()
+    ..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 ||
+      res['output-wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final sileroVad = res['silero-vad'] as String;
+  final inputWav = res['input-wav'] as String;
+  final outputWav = res['output-wav'] as String;
+
+  final sileroVadConfig = sherpa_onnx.SileroVadModelConfig(
+    model: sileroVad,
+    minSilenceDuration: 0.25,
+    minSpeechDuration: 0.5,
+  );
+  final config = sherpa_onnx.VadModelConfig(
+    sileroVad: sileroVadConfig,
+    numThreads: 1,
+    debug: true,
+  );
+
+  final vad = sherpa_onnx.VoiceActivityDetector(
+      config: config, bufferSizeInSeconds: 10);
+
+  final waveData = sherpa_onnx.readWave(inputWav);
+  if (waveData.sampleRate != 16000) {
+    print('Only 16000 Hz is supported. Given: ${waveData.sampleRate}');
+    exit(1);
+  }
+
+  int numSamples = waveData.samples.length;
+  int numIter = numSamples ~/ config.sileroVad.windowSize;
+
+  List<List<double>> allSamples = [];
+
+  for (int i = 0; i != numIter; ++i) {
+    int start = i * config.sileroVad.windowSize;
+    vad.acceptWaveform(Float32List.sublistView(
+        waveData.samples, start, start + config.sileroVad.windowSize));
+
+    if (vad.isDetected()) {
+      while (!vad.isEmpty()) {
+        allSamples.add(vad.front().samples);
+        vad.pop();
+      }
+    }
+  }
+
+  final s = Float32List.fromList(allSamples.expand((x) => x).toList());
+  sherpa_onnx.writeWave(
+      filename: outputWav, samples: s, sampleRate: waveData.sampleRate);
+  print('Saved to ${outputWav}');
+}
--- a/dart-api-examples/vad/pubspec.lock
+++ b/dart-api-examples/vad/pubspec.lock
@@ -0,0 +1,402 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: "5aaf60d96c4cd00fe7f21594b5ad6a1b699c80a27420f8a837f4d68473ef09e3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "68.0.0"
+  _macros:
+    dependency: transitive
+    description: dart
+    source: sdk
+    version: "0.1.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: "21f1d3720fd1c70316399d5e2bccaebb415c434592d778cce8acb967b8578808"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.5.0"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: "7cf60b9f0cc88203c5a190b4cd62a99feea42759a7fa695010eb5de1c0b2252a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.0"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.11.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.18.0"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "3945034e86ea203af7a056d98e98e42a5518fff200d6e8e6647e1886b07e936e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.8.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: "5fc22d7c25582e38ad9a8515372cd9a93834027aacf1801cf01164dac0ffa08c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: f64a0333a82f30b0cca061bc3d143813a486dc086b574bfb233b7c1372427694
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: "97486f20f9c2f7be8f514851703d0119c3596d14ea63227af6f7a481ef2b2f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.2"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: "2ec25704aba361659e10e3e5f5d672068d332fc8ac516421d483a11e5cbd061e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: c1b2e9b5ea78c45e1a0788d29606ba27dc5f71f019f32ca5140f61ef071838cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.1"
+  lints:
+    dependency: "direct dev"
+    description:
+      name: lints
+      sha256: cbf8d4b858bb0134ef3ef87841abdf8d63bfc255c266b7bf6b39daa1085c4290
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  macros:
+    dependency: transitive
+    description:
+      name: macros
+      sha256: "12e8a9842b5a7390de7a781ec63d793527582398d16ea26c60fed58833c9ae79"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.0-main.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.16+1"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: bdb68674043280c3428e9ec998512fb681678676b3c54e773629ffe74419f8c7
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.15.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "2e123074287cc9fd6c09de8336dae606d1ddb88d9ac47358826db698c176a1f2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.5"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.0"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.1"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: ad29c505aee705f41a4d8963641f91ac4cee3c8fad5947e033390a7bd8180fa4
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: a41d3f53c4adf0f57480578c1d61d90342cd617de7fc8077b1304643c2d85c1e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "073c147238594ecd0d193f3456a5fe91c4b0abbcc68bf5cd95b36c4e194ac611"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: "84cf769ad83aa6bb61e0aa5a18e53aea683395f196a6f39c4c881fb90ed4f7ae"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "708b3f6b97248e5781f493b765c3337db11c5d2c81c3094f10904bfa8004c703"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.12"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      sha256: "7ee44229615f8f642b68120165ae4c2a75fe77ae2065b1e55ae4711f6cf0899e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.25.7"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "5b8a98dafc4d5c4c9c72d8b31ab2b23fc13422348d2997120294d3bac86b4ddb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.2"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "55ea5a652e38a1dfb32943a7973f3681a60f872f8c3a05a14664ad54ef9c6696"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.4"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.2"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "360c4271613beb44db559547d02f8b0dc044741d0eeb9aa6ccdb47e8ec54c63a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "14.2.3"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "3d2ad6751b3c16cf07c7fca317a1413b3f26530319181b37e3b9039b84fc01d8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "97da13628db363c635202ad97068d47c5b8aa555808e7a9411963c533b449b27"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.1"
+  web_socket:
+    dependency: transitive
+    description:
+      name: web_socket
+      sha256: "24301d8c293ce6fe327ffe6f59d8fd8834735f0ec36e4fd383ec7ff8a64aa078"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.5"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: a2d56211ee4d35d9b344d9d4ce60f362e4f5d1aafb988302906bd732bc731276
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+sdks:
+  dart: ">=3.4.0 <4.0.0"
--- a/dart-api-examples/vad/pubspec.yaml
+++ b/dart-api-examples/vad/pubspec.yaml
@@ -0,0 +1,17 @@
+name: vad
+
+description: >
+  This example demonstrates how to use the Dart API for VAD (voice activity detection).
+
+version: 1.0.0
+
+environment:
+  sdk: ^3.4.0
+
+dependencies:
+  sherpa_onnx: ^0.0.3
+  path: ^1.9.0
+  args: ^2.5.0
+
+dev_dependencies:
+  lints: ^3.0.0
--- a/dart-api-examples/vad/run.sh
+++ b/dart-api-examples/vad/run.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+
+if [[ ! -f ./silero_vad.onnx ]]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/silero_vad.onnx
+fi
+
+if [[ ! -f ./lei-jun-test.wav ]]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/lei-jun-test.wav
+fi
+
+dart run \
+  ./bin/vad.dart \
+  --silero-vad ./silero_vad.onnx \
+  --input-wav ./lei-jun-test.wav \
+  --output-wav ./lei-jun-test-no-silence.wav
+
+ls -lh *.wav
--- a/scripts/dotnet/generate.py
+++ b/scripts/dotnet/generate.py
@@ -104,9 +104,9 @@ def process_windows(s, rid):
        "piper_phonemize.dll",
        "sherpa-onnx-c-api.dll",
        "sherpa-onnx-core.dll",
-        "sherpa-onnx-fstfar.lib",
-        "sherpa-onnx-fst.lib",
-        "sherpa-onnx-kaldifst-core.lib",
+        "sherpa-onnx-fstfar.dll",
+        "sherpa-onnx-fst.dll",
+        "sherpa-onnx-kaldifst-core.dll",
        "ucd.dll",
    ]

--- a/scripts/dotnet/run.sh
+++ b/scripts/dotnet/run.sh
@@ -30,7 +30,7 @@ mkdir -p linux macos windows-x64 windows-x86
 linux_wheel_filename=sherpa_onnx-${SHERPA_ONNX_VERSION}-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
 linux_wheel=$src_dir/$linux_wheel_filename

-macos_wheel_filename=sherpa_onnx-${SHERPA_ONNX_VERSION}-cp38-cp38-macosx_11_0_universal2.whl
+macos_wheel_filename=sherpa_onnx-${SHERPA_ONNX_VERSION}-cp39-cp39-macosx_11_0_universal2.whl
 macos_wheel=$src_dir/$macos_wheel_filename

 windows_x64_wheel_filename=sherpa_onnx-${SHERPA_ONNX_VERSION}-cp38-cp38-win_amd64.whl
--- a/sherpa-onnx/flutter/CHANGELOG.md
+++ b/sherpa-onnx/flutter/CHANGELOG.md
@@ -0,0 +1,11 @@
+## 0.0.3
+
+* Fix path separator on Windows.
+
+## 0.0.2
+
+* Support specifying lib path.
+
+## 0.0.1
+
+* Initial release.
--- a/sherpa-onnx/flutter/lib/sherpa_onnx.dart
+++ b/sherpa-onnx/flutter/lib/sherpa_onnx.dart
@@ -14,24 +14,40 @@ export 'src/wave_writer.dart';

 import 'src/sherpa_onnx_bindings.dart';

+String? _path;
+
 final DynamicLibrary _dylib = () {
  if (Platform.isIOS) {
    throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
  }
  if (Platform.isMacOS) {
-    return DynamicLibrary.open('libsherpa-onnx-c-api.dylib');
+    if (_path == null) {
+      return DynamicLibrary.open('libsherpa-onnx-c-api.dylib');
+    } else {
+      return DynamicLibrary.open('${_path}/libsherpa-onnx-c-api.dylib');
+    }
  }
+
  if (Platform.isAndroid || Platform.isLinux) {
-    return DynamicLibrary.open('libsherpa-onnx-c-api.so');
+    if (_path == null) {
+      return DynamicLibrary.open('libsherpa-onnx-c-api.so');
+    } else {
+      return DynamicLibrary.open('${_path}/libsherpa-onnx-c-api.so');
+    }
  }

  if (Platform.isWindows) {
-    return DynamicLibrary.open('sherpa-onnx-c-api.dll');
+    if (_path == null) {
+      return DynamicLibrary.open('sherpa-onnx-c-api.dll');
+    } else {
+      return DynamicLibrary.open('${_path}\\sherpa-onnx-c-api.dll');
+    }
  }

  throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
 }();

-void initBindings() {
+void initBindings([String? p]) {
+  _path ??= p;
  SherpaOnnxBindings.init(_dylib);
 }
--- a/sherpa-onnx/flutter/lib/src/offline_recognizer.dart
+++ b/sherpa-onnx/flutter/lib/src/offline_recognizer.dart
@@ -1,7 +1,6 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:convert';
 import 'dart:ffi';
-import 'dart:typed_data';

 import 'package:ffi/ffi.dart';

@@ -262,7 +261,7 @@ class OfflineRecognizer {
    final json =
        SherpaOnnxBindings.getOfflineStreamResultAsJson?.call(stream.ptr) ??
            nullptr;
-    if (json == null) {
+    if (json == nullptr) {
      return OfflineRecognizerResult(text: '', tokens: [], timestamps: []);
    }

--- a/sherpa-onnx/flutter/lib/src/offline_stream.dart
+++ b/sherpa-onnx/flutter/lib/src/offline_stream.dart
@@ -28,7 +28,7 @@ class OfflineStream {
    final pList = p.asTypedList(n);
    pList.setAll(0, samples);

-    SherpaOnnxBindings.acceptWaveformOffline?.call(this.ptr, sampleRate, p, n);
+    SherpaOnnxBindings.acceptWaveformOffline?.call(ptr, sampleRate, p, n);

    calloc.free(p);
  }
--- a/sherpa-onnx/flutter/lib/src/online_recognizer.dart
+++ b/sherpa-onnx/flutter/lib/src/online_recognizer.dart
@@ -1,7 +1,6 @@
 // Copyright (c)  2024  Xiaomi Corporation
 import 'dart:convert';
 import 'dart:ffi';
-import 'dart:typed_data';

 import 'package:ffi/ffi.dart';

@@ -247,7 +246,7 @@ class OnlineRecognizer {
    final json =
        SherpaOnnxBindings.getOnlineStreamResultAsJson?.call(ptr, stream.ptr) ??
            nullptr;
-    if (json == null) {
+    if (json == nullptr) {
      return OnlineRecognizerResult(text: '', tokens: [], timestamps: []);
    }

--- a/sherpa-onnx/flutter/lib/src/online_stream.dart
+++ b/sherpa-onnx/flutter/lib/src/online_stream.dart
@@ -28,8 +28,7 @@ class OnlineStream {
    final pList = p.asTypedList(n);
    pList.setAll(0, samples);

-    SherpaOnnxBindings.onlineStreamAcceptWaveform
-        ?.call(this.ptr, sampleRate, p, n);
+    SherpaOnnxBindings.onlineStreamAcceptWaveform?.call(ptr, sampleRate, p, n);

    calloc.free(p);
  }
--- a/sherpa-onnx/flutter/lib/src/sherpa_onnx_bindings.dart
+++ b/sherpa-onnx/flutter/lib/src/sherpa_onnx_bindings.dart
@@ -553,13 +553,10 @@ typedef DestroyOnlineStreamNative = Void Function(
 typedef DestroyOnlineStream = void Function(Pointer<SherpaOnnxOnlineStream>);

 typedef OnlineStreamAcceptWaveformNative = Void Function(
-    Pointer<SherpaOnnxOnlineStream>,
-    Int32 sample_rate,
-    Pointer<Float>,
-    Int32 n);
+    Pointer<SherpaOnnxOnlineStream>, Int32, Pointer<Float>, Int32);

 typedef OnlineStreamAcceptWaveform = void Function(
-    Pointer<SherpaOnnxOnlineStream>, int sample_rate, Pointer<Float>, int n);
+    Pointer<SherpaOnnxOnlineStream>, int, Pointer<Float>, int);

 typedef OnlineStreamInputFinishedNative = Void Function(
    Pointer<SherpaOnnxOnlineStream>);
--- a/sherpa-onnx/flutter/lib/src/vad.dart
+++ b/sherpa-onnx/flutter/lib/src/vad.dart
@@ -106,8 +106,8 @@ class CircularBuffer {
    SherpaOnnxBindings.circularBufferReset?.call(this.ptr);
  }

-  int get size => SherpaOnnxBindings.circularBufferSize?.call(this.ptr) ?? 0;
-  int get head => SherpaOnnxBindings.circularBufferHead?.call(this.ptr) ?? 0;
+  int get size => SherpaOnnxBindings.circularBufferSize?.call(ptr) ?? 0;
+  int get head => SherpaOnnxBindings.circularBufferHead?.call(ptr) ?? 0;

  Pointer<SherpaOnnxCircularBuffer> ptr;
 }
@@ -159,38 +159,36 @@ class VoiceActivityDetector {
    final pList = p.asTypedList(n);
    pList.setAll(0, samples);

-    SherpaOnnxBindings.voiceActivityDetectorAcceptWaveform
-        ?.call(this.ptr, p, n);
+    SherpaOnnxBindings.voiceActivityDetectorAcceptWaveform?.call(ptr, p, n);

    calloc.free(p);
  }

  bool isEmpty() {
    final int empty =
-        SherpaOnnxBindings.voiceActivityDetectorEmpty?.call(this.ptr) ?? 0;
+        SherpaOnnxBindings.voiceActivityDetectorEmpty?.call(ptr) ?? 0;

    return empty == 1;
  }

  bool isDetected() {
    final int detected =
-        SherpaOnnxBindings.voiceActivityDetectorDetected?.call(this.ptr) ?? 0;
+        SherpaOnnxBindings.voiceActivityDetectorDetected?.call(ptr) ?? 0;

    return detected == 1;
  }

  void pop() {
-    SherpaOnnxBindings.voiceActivityDetectorPop?.call(this.ptr);
+    SherpaOnnxBindings.voiceActivityDetectorPop?.call(ptr);
  }

  void clear() {
-    SherpaOnnxBindings.voiceActivityDetectorClear?.call(this.ptr);
+    SherpaOnnxBindings.voiceActivityDetectorClear?.call(ptr);
  }

  SpeechSegment front() {
    final Pointer<SherpaOnnxSpeechSegment> segment =
-        SherpaOnnxBindings.voiceActivityDetectorFront?.call(this.ptr) ??
-            nullptr;
+        SherpaOnnxBindings.voiceActivityDetectorFront?.call(ptr) ?? nullptr;
    if (segment == nullptr) {
      return SpeechSegment(samples: Float32List(0), start: 0);
    }
@@ -206,7 +204,7 @@ class VoiceActivityDetector {
  }

  void reset() {
-    SherpaOnnxBindings.voiceActivityDetectorReset?.call(this.ptr);
+    SherpaOnnxBindings.voiceActivityDetectorReset?.call(ptr);
  }

  Pointer<SherpaOnnxVoiceActivityDetector> ptr;
--- a/sherpa-onnx/flutter/notes.md
+++ b/sherpa-onnx/flutter/notes.md
@@ -43,3 +43,20 @@ dart analyze
 FLUTTER_XCODE_ARCHS=arm64
 FLUTTER_XCODE_ARCHS=x86_64
 ```
+
+## Examples
+
+  - https://dart.dev/tools/pub/automated-publishing
+
+     Use GitHub actions to publish
+
+  - https://dart.dev/tools/pub/pubspec
+
+     It describes the format of ./pubspec.yaml
+
+  - https://github.com/folksable/blurhash_ffi/
+
+      It supports ios, android, linux, macos, and windows.
+
+ - https://github.com/alexmercerind/dart_vlc
+ - https://github.com/dart-lang/native/tree/main/pkgs/jni
--- a/sherpa-onnx/flutter/pubspec.yaml
+++ b/sherpa-onnx/flutter/pubspec.yaml
@@ -1,17 +1,24 @@
 name: sherpa_onnx
+
 description: >
-  Dart bindings for sherpa-onnx.
-repository: https://github.com/k2-fsa/sherpa-onnx/tree/main/sherpa-onnx/flutter
+  Speech recognition, speech synthesis, and speaker recognition using next-gen Kaldi
+  with onnxruntime without Internet connection.
+
+repository: https://github.com/k2-fsa/sherpa-onnx/tree/master/sherpa-onnx/flutter
+
+issue_tracker: https://github.com/k2-fsa/sherpa-onnx/issues
+documentation: https://k2-fsa.github.io/sherpa/onnx/
+
 topics:
-  - speech-to-text
-  - text-to-speech
+  - speech-recognition
+  - speech-synthesis
  - speaker-identification
-  - spoken-language-identification
  - audio-tagging
  - voice-activity-detection

 # remember to change the version in macos/sherpa_onnx.podspec
-version: 0.0.1
+version: 0.0.2
+
 homepage: https://github.com/k2-fsa/sherpa-onnx

 environment:
@@ -22,30 +29,14 @@ dependencies:
  ffi: ^2.1.0
  flutter:
    sdk: flutter
-  plugin_platform_interface: ^2.0.2

 dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^3.0.0

-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
 # The following section is specific to Flutter packages.
 flutter:
-  # This section identifies this Flutter project as a plugin project.
-  # The 'pluginClass' specifies the class (in Java, Kotlin, Swift, Objective-C, etc.)
-  # which should be registered in the plugin registry. This is required for
-  # using method channels.
-  # The Android 'package' specifies package in which the registered class is.
-  # This is required for using method channels on Android.
-  # The 'ffiPlugin' specifies that native code should be built and bundled.
-  # This is required for using `dart:ffi`.
-  # All these are used by the tooling to maintain consistency when
-  # adding or updating assets for this project.
-  #
-  # Please refer to README.md for a detailed explanation.
  plugin:
    platforms:
      macos:
@@ -54,34 +45,3 @@ flutter:
        ffiPlugin: true
      linux:
        ffiPlugin: true
-
-  # To add assets to your plugin package, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-  #
-  # For details regarding assets in packages, see
-  # https://flutter.dev/assets-and-images/#from-packages
-  #
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware
-
-  # To add custom fonts to your plugin package, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts in packages, see
-  # https://flutter.dev/custom-fonts/#from-packages
--- a/sherpa-onnx/flutter/windows/CMakeLists.txt
+++ b/sherpa-onnx/flutter/windows/CMakeLists.txt
@@ -19,9 +19,9 @@ set(sherpa_onnx_bundled_libraries
  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-c-api.dll"
  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-core.dll"
  "${CMAKE_CURRENT_SOURCE_DIR}/kaldi-decoder-core.dll"
-  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-kaldifst-core.lib"
-  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-fstfar.lib"
-  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-fst.lib"
+  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-kaldifst-core.dll"
+  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-fstfar.dll"
+  "${CMAKE_CURRENT_SOURCE_DIR}/sherpa-onnx-fst.dll"
  "${CMAKE_CURRENT_SOURCE_DIR}/kaldi-native-fbank-core.dll"
  "${CMAKE_CURRENT_SOURCE_DIR}/piper_phonemize.dll"
  "${CMAKE_CURRENT_SOURCE_DIR}/espeak-ng.dll"