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

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}