Add TTS for node-addon-api (#871)

@@ -6,6 +6,8 @@ d=nodejs-addon-examples
 echo "dir: $d"
 cd $d
 
+echo "----------streaming asr----------"
+
 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
@@ -31,6 +33,8 @@ rm sherpa-onnx-streaming-paraformer-bilingual-zh-en.tar.bz2
 node ./test_asr_streaming_paraformer.js
 rm -rf sherpa-onnx-streaming-paraformer-bilingual-zh-en
 
+echo "----------non-streaming asr----------"
+
 curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-zipformer-en-2023-04-01.tar.bz2
 tar xvf sherpa-onnx-zipformer-en-2023-04-01.tar.bz2
 rm sherpa-onnx-zipformer-en-2023-04-01.tar.bz2
@@ -58,3 +62,35 @@ rm sherpa-onnx-paraformer-zh-2023-03-28.tar.bz2
 
 node ./test_asr_non_streaming_paraformer.js
 rm -rf sherpa-onnx-paraformer-zh-2023-03-28
+
+echo "----------tts----------"
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_GB-cori-medium.tar.bz2
+tar xvf vits-piper-en_GB-cori-medium.tar.bz2
+rm vits-piper-en_GB-cori-medium.tar.bz2
+
+node ./test_tts_non_streaming_vits_piper_en.js
+rm -rf vits-piper-en_GB-cori-medium
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-coqui-de-css10.tar.bz2
+tar xvf vits-coqui-de-css10.tar.bz2
+rm vits-coqui-de-css10.tar.bz2
+
+node ./test_tts_non_streaming_vits_coqui_de.js
+rm -rf vits-coqui-de-css10
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/sherpa-onnx-vits-zh-ll.tar.bz2
+tar xvf sherpa-onnx-vits-zh-ll.tar.bz2
+rm sherpa-onnx-vits-zh-ll.tar.bz2
+
+node ./test_tts_non_streaming_vits_zh_ll.js
+rm -rf sherpa-onnx-vits-zh-ll
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+tar xvf vits-icefall-zh-aishell3.tar.bz2
+rm vits-icefall-zh-aishell3.tar.bz2
+
+node ./test_tts_non_streaming_vits_zh_aishell3.js
+rm -rf vits-icefall-zh-aishell3
+
+ls -lh

@@ -94,7 +94,7 @@ jobs:
                 -DSHERPA_ONNX_ENABLE_BINARY=OFF \
                 ..
 
-              make -j
+              make -j2
               make install
               cd ..
 

@@ -105,3 +105,4 @@ sherpa-onnx-ced-*
 node_modules
 package-lock.json
 sherpa-onnx-nemo-*
+sherpa-onnx-vits-*

@@ -143,3 +143,43 @@ node ./test_asr_non_streaming_paraformer.js
 npm install naudiodon2
 node ./test_vad_asr_non_streaming_paraformer_microphone.js
 ```
+
+## Text-to-speech with piper VITS models (TTS)
+
+```bash
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_GB-cori-medium.tar.bz2
+tar xvf vits-piper-en_GB-cori-medium.tar.bz2
+rm vits-piper-en_GB-cori-medium.tar.bz2
+
+node ./test_tts_non_streaming_vits_piper_en.js
+```
+
+## Text-to-speech with piper Coqui-ai/TTS models (TTS)
+
+```bash
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-coqui-de-css10.tar.bz2
+tar xvf vits-coqui-de-css10.tar.bz2
+rm vits-coqui-de-css10.tar.bz2
+
+node ./test_tts_non_streaming_vits_coqui_de.js
+```
+
+## Text-to-speech with vits Chinese models (1/2)
+
+```bash
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/sherpa-onnx-vits-zh-ll.tar.bz2
+tar xvf sherpa-onnx-vits-zh-ll.tar.bz2
+rm sherpa-onnx-vits-zh-ll.tar.bz2
+
+node ./test_tts_non_streaming_vits_zh_ll.js
+```
+
+## Text-to-speech with vits Chinese models (2/2)
+
+```bash
+wget https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+tar xvf vits-icefall-zh-aishell3.tar.bz2
+rm vits-icefall-zh-aishell3.tar.bz2
+
+node ./test_tts_non_streaming_vits_zh_aishell3.js
+```

+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('sherpa-onnx-node');
+const performance = require('perf_hooks').performance;
+
+// please download model files from
+// https://github.com/k2-fsa/sherpa-onnx/releases/tag/tts-models
+function createOfflineTts() {
+  const config = {
+    model: {
+      vits: {
+        model: './vits-coqui-de-css10/model.onnx',
+        tokens: './vits-coqui-de-css10/tokens.txt',
+      },
+      debug: true,
+      numThreads: 1,
+      provider: 'cpu',
+    },
+    maxNumStences: 1,
+  };
+  return new sherpa_onnx.OfflineTts(config);
+}
+
+const tts = createOfflineTts();
+
+const text = 'Alles hat ein Ende, nur die Wurst hat zwei.'
+
+let start = performance.now();
+const audio = tts.generate({text: text, sid: 0, speed: 1.0});
+let stop = performance.now();
+const elapsed_seconds = (stop - start) / 1000;
+const duration = audio.samples.length / audio.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 = ${elapsed_seconds.toFixed(3)}/${duration.toFixed(3)} =`,
+    real_time_factor.toFixed(3))
+
+const filename = 'test-coqui-de.wav';
+sherpa_onnx.writeWave(
+    filename, {samples: audio.samples, sampleRate: audio.sampleRate});
+
+console.log(`Saved to ${filename}`);

+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('sherpa-onnx-node');
+const performance = require('perf_hooks').performance;
+
+// please download model files from
+// https://github.com/k2-fsa/sherpa-onnx/releases/tag/tts-models
+function createOfflineTts() {
+  const config = {
+    model: {
+      vits: {
+        model: './vits-piper-en_GB-cori-medium/en_GB-cori-medium.onnx',
+        tokens: './vits-piper-en_GB-cori-medium/tokens.txt',
+        dataDir: './vits-piper-en_GB-cori-medium/espeak-ng-data',
+      },
+      debug: true,
+      numThreads: 1,
+      provider: 'cpu',
+    },
+    maxNumStences: 1,
+  };
+  return new sherpa_onnx.OfflineTts(config);
+}
+
+const tts = createOfflineTts();
+
+const text =
+    'Today as always, men fall into two groups: slaves and free men. Whoever does not have two-thirds of his day for himself, is a slave, whatever he may be: a statesman, a businessman, an official, or a scholar.'
+
+
+let start = performance.now();
+const audio = tts.generate({text: text, sid: 0, speed: 1.0});
+let stop = performance.now();
+const elapsed_seconds = (stop - start) / 1000;
+const duration = audio.samples.length / audio.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 = ${elapsed_seconds.toFixed(3)}/${duration.toFixed(3)} =`,
+    real_time_factor.toFixed(3))
+
+const filename = 'test-piper-en.wav';
+sherpa_onnx.writeWave(
+    filename, {samples: audio.samples, sampleRate: audio.sampleRate});
+
+console.log(`Saved to ${filename}`);

+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('sherpa-onnx-node');
+const performance = require('perf_hooks').performance;
+
+// please download model files from
+// https://github.com/k2-fsa/sherpa-onnx/releases/tag/tts-models
+function createOfflineTts() {
+  const config = {
+    model: {
+      vits: {
+        model: './vits-icefall-zh-aishell3/model.onnx',
+        tokens: './vits-icefall-zh-aishell3/tokens.txt',
+        lexicon: './vits-icefall-zh-aishell3/lexicon.txt',
+      },
+      debug: true,
+      numThreads: 1,
+      provider: 'cpu',
+    },
+    maxNumStences: 1,
+    ruleFsts:
+        './vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/number.fst,./vits-icefall-zh-aishell3/new_heteronym.fst',
+    ruleFars: './vits-icefall-zh-aishell3/rule.far',
+  };
+  return new sherpa_onnx.OfflineTts(config);
+}
+
+const tts = createOfflineTts();
+
+const text =
+    '他在长沙出生，长白山长大，去过长江，现在他是一个银行的行长，主管行政工作。有困难，请拨110，或者13020240513。今天是2024年5月13号, 他上个月的工资是12345块钱。'
+
+let start = performance.now();
+const audio = tts.generate({text: text, sid: 88, speed: 1.0});
+let stop = performance.now();
+const elapsed_seconds = (stop - start) / 1000;
+const duration = audio.samples.length / audio.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 = ${elapsed_seconds.toFixed(3)}/${duration.toFixed(3)} =`,
+    real_time_factor.toFixed(3))
+
+const filename = 'test-zh-aishell3.wav';
+sherpa_onnx.writeWave(
+    filename, {samples: audio.samples, sampleRate: audio.sampleRate});
+
+console.log(`Saved to ${filename}`);

+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('sherpa-onnx-node');
+const performance = require('perf_hooks').performance;
+
+// please download model files from
+// https://github.com/k2-fsa/sherpa-onnx/releases/tag/tts-models
+function createOfflineTts() {
+  const config = {
+    model: {
+      vits: {
+        model: './sherpa-onnx-vits-zh-ll/model.onnx',
+        tokens: './sherpa-onnx-vits-zh-ll/tokens.txt',
+        lexicon: './sherpa-onnx-vits-zh-ll/lexicon.txt',
+        dictDir: './sherpa-onnx-vits-zh-ll/dict',
+      },
+      debug: true,
+      numThreads: 1,
+      provider: 'cpu',
+    },
+    maxNumStences: 1,
+    ruleFsts:
+        './sherpa-onnx-vits-zh-ll/date.fst,./sherpa-onnx-vits-zh-ll/phone.fst,./sherpa-onnx-vits-zh-ll/number.fst',
+  };
+  return new sherpa_onnx.OfflineTts(config);
+}
+
+const tts = createOfflineTts();
+
+const text =
+    '当夜幕降临，星光点点，伴随着微风拂面，我在静谧中感受着时光的流转，思念如涟漪荡漾，梦境如画卷展开，我与自然融为一体，沉静在这片宁静的美丽之中，感受着生命的奇迹与温柔。2024年5月13号，拨打110或者18920240513。123456块钱。'
+
+let start = performance.now();
+const audio = tts.generate({text: text, sid: 2, speed: 1.0});
+let stop = performance.now();
+const elapsed_seconds = (stop - start) / 1000;
+const duration = audio.samples.length / audio.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 = ${elapsed_seconds.toFixed(3)}/${duration.toFixed(3)} =`,
+    real_time_factor.toFixed(3))
+
+const filename = 'test-zh-ll.wav';
+sherpa_onnx.writeWave(
+    filename, {samples: audio.samples, sampleRate: audio.sampleRate});
+
+console.log(`Saved to ${filename}`);

@@ -99,7 +99,7 @@ ai.on('data', data => {
               .split(' ')[0]}.wav`;
       sherpa_onnx.writeWave(
           filename,
-          {samples: segment.samples, sampleRate: vad.config.sampleRate})
+          {samples: segment.samples, sampleRate: vad.config.sampleRate});
 
       index += 1;
     }

@@ -97,7 +97,7 @@ ai.on('data', data => {
               .split(' ')[0]}.wav`;
       sherpa_onnx.writeWave(
           filename,
-          {samples: segment.samples, sampleRate: vad.config.sampleRate})
+          {samples: segment.samples, sampleRate: vad.config.sampleRate});
 
       index += 1;
     }

@@ -102,7 +102,7 @@ ai.on('data', data => {
               .split(' ')[0]}.wav`;
       sherpa_onnx.writeWave(
           filename,
-          {samples: segment.samples, sampleRate: vad.config.sampleRate})
+          {samples: segment.samples, sampleRate: vad.config.sampleRate});
 
       index += 1;
     }

@@ -98,7 +98,7 @@ ai.on('data', data => {
               .split(' ')[0]}.wav`;
       sherpa_onnx.writeWave(
           filename,
-          {samples: segment.samples, sampleRate: vad.config.sampleRate})
+          {samples: segment.samples, sampleRate: vad.config.sampleRate});
 
       index += 1;
     }

@@ -71,7 +71,7 @@ ai.on('data', data => {
               .split(' ')[0]}.wav`;
       sherpa_onnx.writeWave(
           filename,
-          {samples: segment.samples, sampleRate: vad.config.sampleRate})
+          {samples: segment.samples, sampleRate: vad.config.sampleRate});
       const duration = segment.samples.length / vad.config.sampleRate;
       console.log(`${index} End of speech. Duration: ${duration} seconds`);
       console.log(`Saved to ${filename}`);

@@ -19,6 +19,7 @@ include_directories(${CMAKE_JS_INC})
 
 set(srcs
   src/non-streaming-asr.cc
+  src/non-streaming-tts.cc
   src/sherpa-onnx-node-addon-api.cc
   src/streaming-asr.cc
   src/vad.cc

@@ -25,8 +25,8 @@ for (const p of possible_paths) {
 }
 
 if (!found) {
-  let msg =
-      `Could not find sherpa-onnx. Tried\n\n  ${possible_paths.join('\n  ')}\n`
+  let msg = `Could not find sherpa-onnx-node. Tried\n\n  ${
+      possible_paths.join('\n  ')}\n`
   if (os.platform() == 'darwin' && process.env.DYLD_LIBRARY_PATH &&
       !process.env.DYLD_LIBRARY_PATH.includes(
           `node_modules/sherpa-onnx-${platform_arch}`)) {

+const addon = require('./addon.js');
+
+class OfflineTts {
+  constructor(config) {
+    this.handle = addon.createOfflineTts(config);
+    this.config = config;
+
+    this.numSpeakers = addon.getOfflineTtsNumSpeakers(this.handle);
+    this.sampleRate = addon.getOfflineTtsSampleRate(this.handle);
+  }
+
+  /*
+   input obj: {text: "xxxx", sid: 0, speed: 1.0}
+   where text is a string, sid is a int32, speed is a float
+
+   return an object {samples: Float32Array, sampleRate: <a number>}
+   */
+  generate(obj) {
+    return addon.offlineTtsGenerate(this.handle, obj);
+  }
+}
+
+module.exports = {
+  OfflineTts,
+}

 const addon = require('./addon.js')
 const streaming_asr = require('./streaming-asr.js');
 const non_streaming_asr = require('./non-streaming-asr.js');
+const non_streaming_tts = require('./non-streaming-tts.js');
 const vad = require('./vad.js');
 
 module.exports = {
   OnlineRecognizer: streaming_asr.OnlineRecognizer,
   OfflineRecognizer: non_streaming_asr.OfflineRecognizer,
+  OfflineTts: non_streaming_tts.OfflineTts,
   readWave: addon.readWave,
   writeWave: addon.writeWave,
   Display: streaming_asr.Display,

+// scripts/node-addon-api/src/non-streaming-tts.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include <sstream>
+
+#include "napi.h"  // NOLINT
+#include "sherpa-onnx/c-api/c-api.h"
+
+static SherpaOnnxOfflineTtsVitsModelConfig GetOfflineTtsVitsModelConfig(
+    Napi::Object obj) {
+  SherpaOnnxOfflineTtsVitsModelConfig c;
+  memset(&c, 0, sizeof(c));
+
+  if (!obj.Has("vits") || !obj.Get("vits").IsObject()) {
+    return c;
+  }
+
+  Napi::Object o = obj.Get("vits").As<Napi::Object>();
+
+  if (o.Has("model") && o.Get("model").IsString()) {
+    Napi::String model = o.Get("model").As<Napi::String>();
+    std::string s = model.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.model = p;
+  }
+
+  if (o.Has("lexicon") && o.Get("lexicon").IsString()) {
+    Napi::String lexicon = o.Get("lexicon").As<Napi::String>();
+    std::string s = lexicon.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.lexicon = p;
+  }
+
+  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;
+
+    c.tokens = p;
+  }
+
+  if (o.Has("dataDir") && o.Get("dataDir").IsString()) {
+    Napi::String data_dir = o.Get("dataDir").As<Napi::String>();
+    std::string s = data_dir.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.data_dir = p;
+  }
+
+  if (o.Has("noiseScale") && o.Get("noiseScale").IsNumber()) {
+    c.noise_scale = o.Get("noiseScale").As<Napi::Number>().FloatValue();
+  }
+
+  if (o.Has("noiseScaleW") && o.Get("noiseScaleW").IsNumber()) {
+    c.noise_scale_w = o.Get("noiseScaleW").As<Napi::Number>().FloatValue();
+  }
+
+  if (o.Has("lengthScale") && o.Get("lengthScale").IsNumber()) {
+    c.length_scale = o.Get("lengthScale").As<Napi::Number>().FloatValue();
+  }
+
+  if (o.Has("dictDir") && o.Get("dictDir").IsString()) {
+    Napi::String dict_dir = o.Get("dictDir").As<Napi::String>();
+    std::string s = dict_dir.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.dict_dir = p;
+  }
+
+  return c;
+}
+
+static SherpaOnnxOfflineTtsModelConfig GetOfflineTtsModelConfig(
+    Napi::Object obj) {
+  SherpaOnnxOfflineTtsModelConfig c;
+  memset(&c, 0, sizeof(c));
+
+  if (!obj.Has("model") || !obj.Get("model").IsObject()) {
+    return c;
+  }
+
+  Napi::Object o = obj.Get("model").As<Napi::Object>();
+
+  c.vits = GetOfflineTtsVitsModelConfig(o);
+
+  if (o.Has("numThreads") && o.Get("numThreads").IsNumber()) {
+    c.num_threads = o.Get("numThreads").As<Napi::Number>().Int32Value();
+  }
+
+  if (o.Has("debug") &&
+      (o.Get("debug").IsNumber() || o.Get("debug").IsBoolean())) {
+    if (o.Get("debug").IsBoolean()) {
+      c.debug = o.Get("debug").As<Napi::Boolean>().Value();
+    } else {
+      c.debug = o.Get("debug").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;
+
+    c.provider = p;
+  }
+
+  return c;
+}
+
+static Napi::External<SherpaOnnxOfflineTts> CreateOfflineTtsWrapper(
+    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 o = info[0].As<Napi::Object>();
+
+  SherpaOnnxOfflineTtsConfig c;
+  memset(&c, 0, sizeof(c));
+
+  c.model = GetOfflineTtsModelConfig(o);
+
+  if (o.Has("ruleFsts") && o.Get("ruleFsts").IsString()) {
+    Napi::String rule_fsts = o.Get("ruleFsts").As<Napi::String>();
+    std::string s = rule_fsts.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.rule_fsts = p;
+  }
+
+  if (o.Has("maxNumSentences") && o.Get("maxNumSentences").IsNumber()) {
+    c.max_num_sentences =
+        o.Get("maxNumSentences").As<Napi::Number>().Int32Value();
+  }
+
+  if (o.Has("ruleFars") && o.Get("ruleFars").IsString()) {
+    Napi::String rule_fars = o.Get("ruleFars").As<Napi::String>();
+    std::string s = rule_fars.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    c.rule_fars = p;
+  }
+
+  SherpaOnnxOfflineTts *tts = SherpaOnnxCreateOfflineTts(&c);
+
+  if (c.model.vits.model) {
+    delete[] c.model.vits.model;
+  }
+
+  if (c.model.vits.lexicon) {
+    delete[] c.model.vits.lexicon;
+  }
+
+  if (c.model.vits.tokens) {
+    delete[] c.model.vits.tokens;
+  }
+
+  if (c.model.vits.data_dir) {
+    delete[] c.model.vits.data_dir;
+  }
+
+  if (c.model.vits.dict_dir) {
+    delete[] c.model.vits.dict_dir;
+  }
+
+  if (c.model.provider) {
+    delete[] c.model.provider;
+  }
+
+  if (c.rule_fsts) {
+    delete[] c.rule_fsts;
+  }
+
+  if (c.rule_fars) {
+    delete[] c.rule_fars;
+  }
+
+  if (!tts) {
+    Napi::TypeError::New(env, "Please check your config!")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  return Napi::External<SherpaOnnxOfflineTts>::New(
+      env, tts, [](Napi::Env env, SherpaOnnxOfflineTts *tts) {
+        SherpaOnnxDestroyOfflineTts(tts);
+      });
+}
+
+static Napi::Number OfflineTtsSampleRateWrapper(
+    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, "Argument 0 should be an offline tts pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOfflineTts *tts =
+      info[0].As<Napi::External<SherpaOnnxOfflineTts>>().Data();
+
+  int32_t sample_rate = SherpaOnnxOfflineTtsSampleRate(tts);
+
+  return Napi::Number::New(env, sample_rate);
+}
+
+static Napi::Number OfflineTtsNumSpeakersWrapper(
+    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, "Argument 0 should be an offline tts pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOfflineTts *tts =
+      info[0].As<Napi::External<SherpaOnnxOfflineTts>>().Data();
+
+  int32_t num_speakers = SherpaOnnxOfflineTtsNumSpeakers(tts);
+
+  return Napi::Number::New(env, num_speakers);
+}
+
+static Napi::Object OfflineTtsGenerateWrapper(const Napi::CallbackInfo &info) {
+  Napi::Env env = info.Env();
+
+  if (info.Length() != 2) {
+    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, "Argument 0 should be an offline tts pointer.")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  SherpaOnnxOfflineTts *tts =
+      info[0].As<Napi::External<SherpaOnnxOfflineTts>>().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("text")) {
+    Napi::TypeError::New(env, "The argument object should have a field text")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!obj.Get("text").IsString()) {
+    Napi::TypeError::New(env, "The object['text'] should be a string")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!obj.Has("sid")) {
+    Napi::TypeError::New(env, "The argument object should have a field sid")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!obj.Get("sid").IsNumber()) {
+    Napi::TypeError::New(env, "The object['sid'] should be a number")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!obj.Has("speed")) {
+    Napi::TypeError::New(env, "The argument object should have a field speed")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  if (!obj.Get("speed").IsNumber()) {
+    Napi::TypeError::New(env, "The object['speed'] should be a number")
+        .ThrowAsJavaScriptException();
+
+    return {};
+  }
+
+  Napi::String _text = obj.Get("text").As<Napi::String>();
+  std::string text = _text.Utf8Value();
+  int32_t sid = obj.Get("sid").As<Napi::Number>().Int32Value();
+  float speed = obj.Get("speed").As<Napi::Number>().FloatValue();
+
+  const SherpaOnnxGeneratedAudio *audio =
+      SherpaOnnxOfflineTtsGenerate(tts, text.c_str(), sid, speed);
+
+  Napi::ArrayBuffer arrayBuffer = Napi::ArrayBuffer::New(
+      env, const_cast<float *>(audio->samples), sizeof(float) * audio->n,
+      [](Napi::Env /*env*/, void * /*data*/,
+         const SherpaOnnxGeneratedAudio *hint) {
+        SherpaOnnxDestroyOfflineTtsGeneratedAudio(hint);
+      },
+      audio);
+  Napi::Float32Array float32Array =
+      Napi::Float32Array::New(env, audio->n, arrayBuffer, 0);
+
+  Napi::Object ans = Napi::Object::New(env);
+  ans.Set(Napi::String::New(env, "samples"), float32Array);
+  ans.Set(Napi::String::New(env, "sampleRate"), audio->sample_rate);
+  return ans;
+}
+
+void InitNonStreamingTts(Napi::Env env, Napi::Object exports) {
+  exports.Set(Napi::String::New(env, "createOfflineTts"),
+              Napi::Function::New(env, CreateOfflineTtsWrapper));
+
+  exports.Set(Napi::String::New(env, "getOfflineTtsSampleRate"),
+              Napi::Function::New(env, OfflineTtsSampleRateWrapper));
+
+  exports.Set(Napi::String::New(env, "getOfflineTtsNumSpeakers"),
+              Napi::Function::New(env, OfflineTtsNumSpeakersWrapper));
+
+  exports.Set(Napi::String::New(env, "offlineTtsGenerate"),
+              Napi::Function::New(env, OfflineTtsGenerateWrapper));
+}

@@ -7,6 +7,8 @@ void InitStreamingAsr(Napi::Env env, Napi::Object exports);
 
 void InitNonStreamingAsr(Napi::Env env, Napi::Object exports);
 
+void InitNonStreamingTts(Napi::Env env, Napi::Object exports);
+
 void InitVad(Napi::Env env, Napi::Object exports);
 
 void InitWaveReader(Napi::Env env, Napi::Object exports);
@@ -16,6 +18,7 @@ void InitWaveWriter(Napi::Env env, Napi::Object exports);
 Napi::Object Init(Napi::Env env, Napi::Object exports) {
   InitStreamingAsr(env, exports);
   InitNonStreamingAsr(env, exports);
+  InitNonStreamingTts(env, exports);
   InitVad(env, exports);
   InitWaveReader(env, exports);
   InitWaveWriter(env, exports);

@@ -605,7 +605,7 @@ static void InputFinishedWrapper(const Napi::CallbackInfo &info) {
 
   if (info.Length() != 1) {
     std::ostringstream os;
-    os << "Expect only 1 arguments. Given: " << info.Length();
+    os << "Expect only 1 argument. Given: " << info.Length();
 
     Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
 

@@ -823,7 +823,7 @@ SHERPA_ONNX_API int32_t
 SherpaOnnxOfflineTtsNumSpeakers(const SherpaOnnxOfflineTts *tts);
 
 // Generate audio from the given text and speaker id (sid).
-// The user has to use DestroyOfflineTtsGeneratedAudio() to free the
+// The user has to use SherpaOnnxDestroyOfflineTtsGeneratedAudio() to free the
 // returned pointer to avoid memory leak.
 SHERPA_ONNX_API const SherpaOnnxGeneratedAudio *SherpaOnnxOfflineTtsGenerate(
     const SherpaOnnxOfflineTts *tts, const char *text, int32_t sid,