Begin to add node-addon-api for sherpa-onnx (#826)

.github/workflows/test-nodejs-addon-api.yaml

@@ -0,0 +1,106 @@
+name: test-node-addon-api
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/test-node-addon-api.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
+      - 'sherpa-onnx/c-api/*'
+      - 'scripts/node-addon-api/**'
+
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/test-node-addon-api.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
+      - 'sherpa-onnx/c-api/*'
+      - 'scripts/node-addon-api/**'
+
+  workflow_dispatch:
+
+concurrency:
+  group: test-node-addon-api-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  test-node-addon-api:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, macos-14]
+        python-version: ["3.8"]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - uses: actions/setup-node@v4
+        with:
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Display node version
+        shell: bash
+        run: |
+          node --version
+
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-release-shared
+
+      - name: Build sherpa-onnx
+        shell: bash
+        run: |
+          mkdir build
+          cd build
+          cmake -DCMAKE_INSTALL_PREFIX=/tmp/sherpa-onnx -DBUILD_SHARED_LIBS=ON ..
+          make -j
+          make install
+
+      - name: Build node-addon-api package
+        shell: bash
+        run: |
+          cd scripts/node-addon-api
+
+          export PKG_CONFIG_PATH=/tmp/sherpa-onnx:$PKG_CONFIG_PATH
+
+          ls -lh /tmp/sherpa-onnx
+
+          pkg-config --cflags sherpa-onnx
+          pkg-config --libs sherpa-onnx
+
+          a=$(pkg-config --cflags sherpa-onnx);a=${a:2};echo $a
+
+          npm i
+
+          ./node_modules/.bin/node-gyp configure build --verbose
+
+      - name: Test streaming transducer
+        shell: bash
+        run: |
+          cd scripts/node-addon-api
+          curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20.tar.bz2
+          tar xvf sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20.tar.bz2
+          rm sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20.tar.bz2
+
+          node test/test_asr_streaming_transducer.js
+
+          rm -rf sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20

.gitignore

@@ -102,3 +102,5 @@ sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01
 *.tar.bz2
 *.zip
 sherpa-onnx-ced-*
+node_modules
+package-lock.json

scripts/node-addon-api/README.md

@@ -0,0 +1,3 @@
+# Introduction
+
+This folder contains `node-addon-api` wrapper for `sherpa-onnx`.

scripts/node-addon-api/binding.gyp

@@ -0,0 +1,35 @@
+{
+  'targets': [
+    {
+      'target_name': 'sherpa-onnx-node-addon-api-native',
+      'sources': [
+        'src/sherpa-onnx-node-addon-api.cc',
+        'src/streaming-asr.cc',
+        'src/wave-reader.cc'
+      ],
+      'include_dirs': [
+        "<!@(node -p \"require('node-addon-api').include\")",
+        "<!@(a=$(pkg-config --cflags sherpa-onnx);echo ${a:2})"
+      ],
+      'dependencies': ["<!(node -p \"require('node-addon-api').gyp\")"],
+      'cflags!': [
+        '-fno-exceptions',
+      ],
+      'cflags_cc!': [
+        '-fno-exceptions',
+        '-std=c++17'
+      ],
+      'libraries': [
+        "<!@(pkg-config --libs sherpa-onnx)"
+      ],
+      'xcode_settings': {
+        'GCC_ENABLE_CPP_EXCEPTIONS': 'YES',
+        'CLANG_CXX_LIBRARY': 'libc++',
+        'MACOSX_DEPLOYMENT_TARGET': '10.7'
+      },
+      'msvs_settings': {
+        'VCCLCompilerTool': { 'ExceptionHandling': 1 },
+      }
+    }
+  ]
+}

scripts/node-addon-api/lib/sherpa-onnx.js

@@ -0,0 +1,7 @@
+const addon = require('bindings')('sherpa-onnx-node-addon-api-native');
+const streaming_asr = require('./streaming-asr.js');
+
+module.exports = {
+  OnlineRecognizer: streaming_asr.OnlineRecognizer,
+  readWave: addon.readWave,
+}

scripts/node-addon-api/lib/streaming-asr.js

@@ -0,0 +1,41 @@
+const addon = require('bindings')('sherpa-onnx-node-addon-api-native');
+
+class OnlineStream {
+  constructor(handle) {
+    this.handle = handle;
+  }
+
+  // samples is a float32 array containing samples in the range [-1, 1]
+  acceptWaveform(samples, sampleRate) {
+    addon.acceptWaveformOnline(
+        this.handle, {samples: samples, sampleRate: sampleRate})
+  }
+}
+
+class OnlineRecognizer {
+  constructor(config) {
+    this.handle = addon.createOnlineRecognizer(config);
+  }
+
+  createStream() {
+    const handle = addon.createOnlineStream(this.handle);
+    return new OnlineStream(handle);
+  }
+
+  isReady(stream) {
+    return addon.isOnlineStreamReady(this.handle, stream.handle);
+  }
+
+  decode(stream) {
+    addon.decodeOnlineStream(this.handle, stream.handle);
+  }
+
+  getResult(stream) {
+    const jsonStr =
+        addon.getOnlineStreamResultAsJson(this.handle, stream.handle);
+
+    return JSON.parse(jsonStr);
+  }
+}
+
+module.exports = {OnlineRecognizer}

scripts/node-addon-api/package.json

@@ -0,0 +1,53 @@
+{
+  "main": "lib/sherpa-onnx.js",
+  "version": "1.0.0",
+  "description": "Speech-to-text and text-to-speech using Next-gen Kaldi without internet connection",
+  "dependencies": {
+    "node-addon-api": "^1.1.0",
+    "bindings": "^1.5.0",
+    "node-gyp": "^10.1.0"
+  },
+  "scripts": {
+    "test": "node --napi-modules ./test/test_binding.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/k2-fsa/sherpa-onnx.git"
+  },
+  "keywords": [
+    "speech to text",
+    "text to speech",
+    "transcription",
+    "real-time speech recognition",
+    "without internet connection",
+    "embedded systems",
+    "open source",
+    "zipformer",
+    "asr",
+    "tts",
+    "stt",
+    "c++",
+    "onnxruntime",
+    "onnx",
+    "ai",
+    "next-gen kaldi",
+    "offline",
+    "privacy",
+    "open source",
+    "streaming speech recognition",
+    "speech",
+    "recognition",
+    "vad",
+    "node-addon-api",
+    "speaker id",
+    "language id"
+  ],
+  "author": "The next-gen Kaldi team",
+  "license": "Apache-2.0",
+  "gypfile": true,
+  "name": "sherpa-onnx-node-addon-api",
+  "bugs": {
+    "url": "https://github.com/k2-fsa/sherpa-onnx/issues"
+  },
+  "homepage": "https://github.com/k2-fsa/sherpa-onnx#readme"
+}

scripts/node-addon-api/src/sherpa-onnx-node-addon-api.cc

@@ -0,0 +1,16 @@
+// scripts/node-addon-api/src/sherpa-onnx-node-addon-api.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+#include "napi.h"  // NOLINT
+
+Napi::Object InitStreamingAsr(Napi::Env env, Napi::Object exports);
+void InitWaveReader(Napi::Env env, Napi::Object exports);
+
+Napi::Object Init(Napi::Env env, Napi::Object exports) {
+  InitStreamingAsr(env, exports);
+  InitWaveReader(env, exports);
+
+  return exports;
+}
+
+NODE_API_MODULE(addon, Init)

scripts/node-addon-api/src/streaming-asr.cc

@@ -0,0 +1,461 @@
+// scripts/node-addon-api/src/streaming-asr.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+#include <sstream>
+
+#include "napi.h"  // NOLINT
+#include "sherpa-onnx/c-api/c-api.h"
+/*
+{
+  'featConfig': {
+    'sampleRate': 16000,
+    'featureDim': 80,
+  }
+};
+ */
+static SherpaOnnxFeatureConfig GetFeatureConfig(Napi::Object obj) {
+  SherpaOnnxFeatureConfig config;
+  memset(&config, 0, sizeof(config));
+
+  if (!obj.Has("featConfig") || !obj.Get("featConfig").IsObject()) {
+    return config;
+  }
+
+  Napi::Object featConfig = obj.Get("featConfig").As<Napi::Object>();
+
+  if (featConfig.Has("sampleRate") && featConfig.Get("sampleRate").IsNumber()) {
+    config.sample_rate =
+        featConfig.Get("sampleRate").As<Napi::Number>().Int32Value();
+  }
+
+  if (featConfig.Has("featureDim") && featConfig.Get("featureDim").IsNumber()) {
+    config.feature_dim =
+        featConfig.Get("featureDim").As<Napi::Number>().Int32Value();
+  }
+
+  return config;
+}
+/*
+{
+  'transducer': {
+    'encoder': './encoder.onnx',
+    'decoder': './decoder.onnx',
+    'joiner': './joiner.onnx',
+  }
+}
+ */
+
+static SherpaOnnxOnlineTransducerModelConfig GetOnlineTransducerModelConfig(
+    Napi::Object obj) {
+  SherpaOnnxOnlineTransducerModelConfig config;
+  memset(&config, 0, sizeof(config));
+
+  if (!obj.Has("transducer") || !obj.Get("transducer").IsObject()) {
+    return config;
+  }
+
+  Napi::Object o = obj.Get("transducer").As<Napi::Object>();
+
+  if (o.Has("encoder") && o.Get("encoder").IsString()) {
+    Napi::String encoder = o.Get("encoder").As<Napi::String>();
+    std::string s = encoder.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.encoder = p;
+  }
+
+  if (o.Has("decoder") && o.Get("decoder").IsString()) {
+    Napi::String decoder = o.Get("decoder").As<Napi::String>();
+    std::string s = decoder.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.decoder = p;
+  }
+
+  if (o.Has("joiner") && o.Get("joiner").IsString()) {
+    Napi::String joiner = o.Get("joiner").As<Napi::String>();
+    std::string s = joiner.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.joiner = p;
+  }
+
+  return config;
+}
+
+static SherpaOnnxOnlineModelConfig GetOnlineModelConfig(Napi::Object obj) {
+  SherpaOnnxOnlineModelConfig config;
+  memset(&config, 0, sizeof(config));
+
+  if (!obj.Has("modelConfig") || !obj.Get("modelConfig").IsObject()) {
+    return config;
+  }
+
+  Napi::Object o = obj.Get("modelConfig").As<Napi::Object>();
+
+  config.transducer = GetOnlineTransducerModelConfig(o);
+
+  if (o.Has("tokens") && o.Get("tokens").IsString()) {
+    Napi::String tokens = o.Get("tokens").As<Napi::String>();
+    std::string s = tokens.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.tokens = p;
+  }
+
+  if (o.Has("numThreads") && o.Get("numThreads").IsNumber()) {
+    config.num_threads = o.Get("numThreads").As<Napi::Number>().Int32Value();
+  }
+
+  if (o.Has("provider") && o.Get("provider").IsString()) {
+    Napi::String provider = o.Get("provider").As<Napi::String>();
+    std::string s = provider.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.provider = p;
+  }
+
+  if (o.Has("debug") && o.Get("debug").IsNumber()) {
+    config.debug = o.Get("debug").As<Napi::Number>().Int32Value();
+  }
+
+  if (o.Has("modelType") && o.Get("modelType").IsString()) {
+    Napi::String model_type = o.Get("modelType").As<Napi::String>();
+    std::string s = model_type.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.model_type = p;
+  }
+
+  return config;
+}
+
+static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
+    const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 1) {
+    std::ostringstream os;
+    os << "Expect only 1 argument. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[0].IsObject()) {
+    Napi::TypeError::New(env, "Expect an object as the argument")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  Napi::Object config = info[0].As<Napi::Object>();
+  SherpaOnnxOnlineRecognizerConfig c;
+  memset(&c, 0, sizeof(c));
+  c.feat_config = GetFeatureConfig(config);
+  c.model_config = GetOnlineModelConfig(config);
+#if 0
+  printf("encoder: %s\n", c.model_config.transducer.encoder
+                              ? c.model_config.transducer.encoder
+                              : "no");
+  printf("decoder: %s\n", c.model_config.transducer.decoder
+                              ? c.model_config.transducer.decoder
+                              : "no");
+  printf("joiner: %s\n", c.model_config.transducer.joiner
+                             ? c.model_config.transducer.joiner
+                             : "no");
+
+  printf("tokens: %s\n", c.model_config.tokens ? c.model_config.tokens : "no");
+  printf("num_threads: %d\n", c.model_config.num_threads);
+  printf("provider: %s\n",
+         c.model_config.provider ? c.model_config.provider : "no");
+  printf("debug: %d\n", c.model_config.debug);
+  printf("model_type: %s\n",
+         c.model_config.model_type ? c.model_config.model_type : "no");
+#endif
+
+  SherpaOnnxOnlineRecognizer *recognizer = CreateOnlineRecognizer(&c);
+
+  if (c.model_config.transducer.encoder) {
+    delete[] c.model_config.transducer.encoder;
+  }
+
+  if (c.model_config.transducer.decoder) {
+    delete[] c.model_config.transducer.decoder;
+  }
+
+  if (c.model_config.transducer.joiner) {
+    delete[] c.model_config.transducer.joiner;
+  }
+
+  if (c.model_config.tokens) {
+    delete[] c.model_config.tokens;
+  }
+
+  if (c.model_config.provider) {
+    delete[] c.model_config.provider;
+  }
+
+  if (c.model_config.model_type) {
+    delete[] c.model_config.model_type;
+  }
+
+  if (!recognizer) {
+    Napi::TypeError::New(env, "Please check your config!")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  return Napi::External<SherpaOnnxOnlineRecognizer>::New(
+      env, recognizer,
+      [](Napi::Env env, SherpaOnnxOnlineRecognizer *recognizer) {
+        DestroyOnlineRecognizer(recognizer);
+      });
+}
+
+static Napi::External<SherpaOnnxOnlineStream> CreateOnlineStreamWrapper(
+    const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 1) {
+    std::ostringstream os;
+    os << "Expect only 1 argument. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[0].IsExternal()) {
+    Napi::TypeError::New(
+        env, "You should pass a recognizer pointer as the only argument")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      info[0].As<Napi::External<SherpaOnnxOnlineRecognizer>>().Data();
+
+  SherpaOnnxOnlineStream *stream = CreateOnlineStream(recognizer);
+
+  return Napi::External<SherpaOnnxOnlineStream>::New(
+      env, stream, [](Napi::Env env, SherpaOnnxOnlineStream *stream) {
+        DestroyOnlineStream(stream);
+      });
+}
+
+static void AcceptWaveformWrapper(const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+
+  if (info.Length() != 2) {
+    std::ostringstream os;
+    os << "Expect only 2 arguments. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!info[0].IsExternal()) {
+    Napi::TypeError::New(env, "Argument 0 should be a online stream pointer.")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  SherpaOnnxOnlineStream *stream =
+      info[0].As<Napi::External<SherpaOnnxOnlineStream>>().Data();
+
+  if (!info[1].IsObject()) {
+    Napi::TypeError::New(env, "Argument 1 should be an object")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  Napi::Object obj = info[1].As<Napi::Object>();
+
+  if (!obj.Has("samples")) {
+    Napi::TypeError::New(env, "The argument object should have a field samples")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!obj.Get("samples").IsTypedArray()) {
+    Napi::TypeError::New(env, "The object['samples'] should be a typed array")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!obj.Has("sampleRate")) {
+    Napi::TypeError::New(env,
+                         "The argument object should have a field sampleRate")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!obj.Get("sampleRate").IsNumber()) {
+    Napi::TypeError::New(env, "The object['samples'] should be a number")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  Napi::Float32Array samples = obj.Get("samples").As<Napi::Float32Array>();
+  int32_t sample_rate = obj.Get("sampleRate").As<Napi::Number>().Int32Value();
+
+  AcceptWaveform(stream, sample_rate, samples.Data(), samples.ElementLength());
+}
+
+static Napi::Boolean IsOnlineStreamReadyWrapper(
+    const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 2) {
+    std::ostringstream os;
+    os << "Expect only 2 arguments. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[0].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 0 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[1].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 1 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      info[0].As<Napi::External<SherpaOnnxOnlineRecognizer>>().Data();
+
+  SherpaOnnxOnlineStream *stream =
+      info[1].As<Napi::External<SherpaOnnxOnlineStream>>().Data();
+
+  int32_t is_ready = IsOnlineStreamReady(recognizer, stream);
+
+  return Napi::Boolean::New(env, is_ready);
+}
+
+static void DecodeOnlineStreamWrapper(const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 2) {
+    std::ostringstream os;
+    os << "Expect only 2 arguments. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!info[0].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 0 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  if (!info[1].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 1 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return;
+  }
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      info[0].As<Napi::External<SherpaOnnxOnlineRecognizer>>().Data();
+
+  SherpaOnnxOnlineStream *stream =
+      info[1].As<Napi::External<SherpaOnnxOnlineStream>>().Data();
+
+  DecodeOnlineStream(recognizer, stream);
+}
+
+static Napi::String GetOnlineStreamResultAsJsonWrapper(
+    const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 2) {
+    std::ostringstream os;
+    os << "Expect only 2 arguments. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[0].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 0 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!info[1].IsExternal()) {
+    Napi::TypeError::New(env,
+                         "Argument 1 should be a online recognizer pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      info[0].As<Napi::External<SherpaOnnxOnlineRecognizer>>().Data();
+
+  SherpaOnnxOnlineStream *stream =
+      info[1].As<Napi::External<SherpaOnnxOnlineStream>>().Data();
+
+  const char *json = GetOnlineStreamResultAsJson(recognizer, stream);
+  Napi::String s = Napi::String::New(env, json);
+
+  DestroyOnlineStreamResultJson(json);
+
+  return s;
+}
+
+void InitStreamingAsr(Napi::Env env, Napi::Object exports) {
+  exports.Set(Napi::String::New(env, "createOnlineRecognizer"),
+              Napi::Function::New(env, CreateOnlineRecognizerWrapper));
+
+  exports.Set(Napi::String::New(env, "createOnlineStream"),
+              Napi::Function::New(env, CreateOnlineStreamWrapper));
+
+  exports.Set(Napi::String::New(env, "acceptWaveformOnline"),
+              Napi::Function::New(env, AcceptWaveformWrapper));
+
+  exports.Set(Napi::String::New(env, "isOnlineStreamReady"),
+              Napi::Function::New(env, IsOnlineStreamReadyWrapper));
+
+  exports.Set(Napi::String::New(env, "decodeOnlineStream"),
+              Napi::Function::New(env, DecodeOnlineStreamWrapper));
+
+  exports.Set(Napi::String::New(env, "getOnlineStreamResultAsJson"),
+              Napi::Function::New(env, GetOnlineStreamResultAsJsonWrapper));
+}

scripts/node-addon-api/src/wave-reader.cc

@@ -0,0 +1,57 @@
+// scripts/node-addon-api/src/wave-reader.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include <sstream>
+
+#include "napi.h"  // NOLINT
+#include "sherpa-onnx/c-api/c-api.h"
+
+static Napi::Object ReadWaveWrapper(const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+  if (info.Length() != 1) {
+    std::ostringstream os;
+    os << "Expect only 1 argument. Given: " << info.Length();
+
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+  if (!info[0].IsString()) {
+    Napi::TypeError::New(env, "Argument should be a string")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  std::string filename = info[0].As<Napi::String>().Utf8Value();
+
+  const SherpaOnnxWave *wave = SherpaOnnxReadWave(filename.c_str());
+  if (!wave) {
+    std::ostringstream os;
+    os << "Failed to read '" << filename << "'";
+    Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  Napi::ArrayBuffer arrayBuffer = Napi::ArrayBuffer::New(
+      env, const_cast<float *>(wave->samples),
+      sizeof(float) * wave->num_samples,
+      [](Napi::Env /*env*/, void * /*data*/, const SherpaOnnxWave *hint) {
+        SherpaOnnxFreeWave(hint);
+      },
+      wave);
+  Napi::Float32Array float32Array =
+      Napi::Float32Array::New(env, wave->num_samples, arrayBuffer, 0);
+
+  Napi::Object obj = Napi::Object::New(env);
+  obj.Set(Napi::String::New(env, "samples"), float32Array);
+  obj.Set(Napi::String::New(env, "sampleRate"), wave->sample_rate);
+  return obj;
+}
+
+void InitWaveReader(Napi::Env env, Napi::Object exports) {
+  exports.Set(Napi::String::New(env, "readWave"),
+              Napi::Function::New(env, ReadWaveWrapper));
+}

scripts/node-addon-api/test/test_asr_streaming_transducer.js

@@ -0,0 +1,53 @@
+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('../lib/sherpa-onnx.js');
+
+const config = {
+  'featConfig': {
+    'sampleRate': 16000,
+    'featureDim': 80,
+  },
+  'modelConfig': {
+    'transducer': {
+      'encoder':
+          './sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/encoder-epoch-99-avg-1.onnx',
+      'decoder':
+          './sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/decoder-epoch-99-avg-1.onnx',
+      'joiner':
+          './sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/joiner-epoch-99-avg-1.onnx',
+    },
+    'tokens':
+        './sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/tokens.txt',
+    'numThreads': 2,
+    'provider': 'cpu',
+    'debug': 1,
+    'modelType': 'zipformer',
+  }
+};
+
+const waveFilename =
+    './sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/0.wav';
+
+const recognizer = new sherpa_onnx.OnlineRecognizer(config);
+console.log('Started')
+let start = performance.now();
+const stream = recognizer.createStream();
+const wave = sherpa_onnx.readWave(waveFilename);
+stream.acceptWaveform(wave.samples, wave.sampleRate);
+
+const tailPadding = new Float32Array(wave.sampleRate * 0.4);
+stream.acceptWaveform(tailPadding, wave.sampleRate);
+
+while (recognizer.isReady(stream)) {
+  recognizer.decode(stream);
+}
+result = recognizer.getResult(stream)
+let stop = performance.now();
+console.log('Done')
+
+const elapsed_seconds = (stop - start) / 1000;
+const duration = wave.samples.length / wave.sampleRate;
+const real_time_factor = elapsed_seconds / duration;
+console.log('Wave duration', duration.toFixed(3), 'secodns')
+console.log('Elapsed', elapsed_seconds.toFixed(3), 'secodns')
+console.log('RTF', real_time_factor.toFixed(3))
+console.log('result', result.text)

scripts/node-addon-api/test/test_binding.js

@@ -0,0 +1,4 @@
+const sherpa_onnx = require('../lib/sherpa-onnx.js');
+console.log(sherpa_onnx)
+
+console.log('Tests passed- everything looks OK!');