Add streaming CTC ASR APIs for node-addon-api (#867)

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

@@ -89,6 +89,30 @@ static SherpaOnnxOnlineTransducerModelConfig GetOnlineTransducerModelConfig(
   return config;
 }
 
+static SherpaOnnxOnlineZipformer2CtcModelConfig
+GetOnlineZipformer2CtcModelConfig(Napi::Object obj) {
+  SherpaOnnxOnlineZipformer2CtcModelConfig config;
+  memset(&config, 0, sizeof(config));
+
+  if (!obj.Has("zipformer2Ctc") || !obj.Get("zipformer2Ctc").IsObject()) {
+    return config;
+  }
+
+  Napi::Object o = obj.Get("zipformer2Ctc").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;
+
+    config.model = p;
+  }
+
+  return config;
+}
+
 static SherpaOnnxOnlineModelConfig GetOnlineModelConfig(Napi::Object obj) {
   SherpaOnnxOnlineModelConfig config;
   memset(&config, 0, sizeof(config));
@@ -100,6 +124,7 @@ static SherpaOnnxOnlineModelConfig GetOnlineModelConfig(Napi::Object obj) {
   Napi::Object o = obj.Get("modelConfig").As<Napi::Object>();
 
   config.transducer = GetOnlineTransducerModelConfig(o);
+  config.zipformer2_ctc = GetOnlineZipformer2CtcModelConfig(o);
 
   if (o.Has("tokens") && o.Get("tokens").IsString()) {
     Napi::String tokens = o.Get("tokens").As<Napi::String>();
@@ -147,6 +172,35 @@ static SherpaOnnxOnlineModelConfig GetOnlineModelConfig(Napi::Object obj) {
   return config;
 }
 
+static SherpaOnnxOnlineCtcFstDecoderConfig GetCtcFstDecoderConfig(
+    Napi::Object obj) {
+  SherpaOnnxOnlineCtcFstDecoderConfig config;
+  memset(&config, 0, sizeof(config));
+
+  if (!obj.Has("ctcFstDecoderConfig") ||
+      !obj.Get("ctcFstDecoderConfig").IsObject()) {
+    return config;
+  }
+
+  Napi::Object o = obj.Get("ctcFstDecoderConfig").As<Napi::Object>();
+
+  if (o.Has("graph") && o.Get("graph").IsString()) {
+    Napi::String graph = o.Get("graph").As<Napi::String>();
+    std::string s = graph.Utf8Value();
+    char *p = new char[s.size() + 1];
+    std::copy(s.begin(), s.end(), p);
+    p[s.size()] = 0;
+
+    config.graph = p;
+  }
+
+  if (o.Has("maxActive") && o.Get("maxActive").IsNumber()) {
+    config.max_active = o.Get("maxActive").As<Napi::Number>().Int32Value();
+  }
+
+  return config;
+}
+
 static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
     const Napi::CallbackInfo &info) {
   Napi::Env env = info.Env();
@@ -234,6 +288,8 @@ static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
         config.Get("hotwordsScore").As<Napi::Number>().FloatValue();
   }
 
+  c.ctc_fst_decoder_config = GetCtcFstDecoderConfig(config);
+
 #if 0
   printf("encoder: %s\n", c.model_config.transducer.encoder
                               ? c.model_config.transducer.encoder
@@ -277,6 +333,10 @@ static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
     delete[] c.model_config.transducer.joiner;
   }
 
+  if (c.model_config.zipformer2_ctc.model) {
+    delete[] c.model_config.zipformer2_ctc.model;
+  }
+
   if (c.model_config.tokens) {
     delete[] c.model_config.tokens;
   }
@@ -297,6 +357,10 @@ static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
     delete[] c.hotwords_file;
   }
 
+  if (c.ctc_fst_decoder_config.graph) {
+    delete[] c.ctc_fst_decoder_config.graph;
+  }
+
   if (!recognizer) {
     Napi::TypeError::New(env, "Please check your config!")
         .ThrowAsJavaScriptException();