Support streaming conformer CTC models from wenet (#427)

sherpa-onnx/python/csrc/online-wenet-ctc-model-config.cc

@@ -0,0 +1,25 @@
+// sherpa-onnx/python/csrc/online-wenet-ctc-model-config.cc
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#include "sherpa-onnx/python/csrc/online-wenet-ctc-model-config.h"
+
+#include <string>
+#include <vector>
+
+#include "sherpa-onnx/csrc/online-wenet-ctc-model-config.h"
+
+namespace sherpa_onnx {
+
+void PybindOnlineWenetCtcModelConfig(py::module *m) {
+  using PyClass = OnlineWenetCtcModelConfig;
+  py::class_<PyClass>(*m, "OnlineWenetCtcModelConfig")
+      .def(py::init<const std::string &, int32_t, int32_t>(), py::arg("model"),
+           py::arg("chunk_size") = 16, py::arg("num_left_chunks") = 4)
+      .def_readwrite("model", &PyClass::model)
+      .def_readwrite("chunk_size", &PyClass::chunk_size)
+      .def_readwrite("num_left_chunks", &PyClass::num_left_chunks)
+      .def("__str__", &PyClass::ToString);
+}
+
+}  // namespace sherpa_onnx