Add C++ support for streaming NeMo CTC models. (#857)

sherpa-onnx/csrc/online-nemo-ctc-model-config.cc

@@ -0,0 +1,36 @@
+// sherpa-onnx/csrc/online-nemo-ctc-model-config.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/online-nemo-ctc-model-config.h"
+
+#include "sherpa-onnx/csrc/file-utils.h"
+#include "sherpa-onnx/csrc/macros.h"
+
+namespace sherpa_onnx {
+
+void OnlineNeMoCtcModelConfig::Register(ParseOptions *po) {
+  po->Register("nemo-ctc-model", &model,
+               "Path to CTC model.onnx from NeMo. Please see "
+               "https://github.com/k2-fsa/sherpa-onnx/pull/843");
+}
+
+bool OnlineNeMoCtcModelConfig::Validate() const {
+  if (!FileExists(model)) {
+    SHERPA_ONNX_LOGE("NeMo CTC model '%s' does not exist", model.c_str());
+    return false;
+  }
+
+  return true;
+}
+
+std::string OnlineNeMoCtcModelConfig::ToString() const {
+  std::ostringstream os;
+
+  os << "OnlineNeMoCtcModelConfig(";
+  os << "model=\"" << model << "\")";
+
+  return os.str();
+}
+
+}  // namespace sherpa_onnx