Support streaming conformer CTC models from wenet (#427)

sherpa-onnx/csrc/online-wenet-ctc-model-config.h

@@ -0,0 +1,38 @@
+// sherpa-onnx/csrc/online-wenet-ctc-model-config.h
+//
+// Copyright (c)  2023  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_ONLINE_WENET_CTC_MODEL_CONFIG_H_
+#define SHERPA_ONNX_CSRC_ONLINE_WENET_CTC_MODEL_CONFIG_H_
+
+#include <string>
+
+#include "sherpa-onnx/csrc/parse-options.h"
+
+namespace sherpa_onnx {
+
+struct OnlineWenetCtcModelConfig {
+  std::string model;
+
+  // --chunk_size from wenet
+  int32_t chunk_size = 16;
+
+  // --num_left_chunks from wenet
+  int32_t num_left_chunks = 4;
+
+  OnlineWenetCtcModelConfig() = default;
+
+  OnlineWenetCtcModelConfig(const std::string &model, int32_t chunk_size,
+                            int32_t num_left_chunks)
+      : model(model),
+        chunk_size(chunk_size),
+        num_left_chunks(num_left_chunks) {}
+
+  void Register(ParseOptions *po);
+  bool Validate() const;
+
+  std::string ToString() const;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_ONLINE_WENET_CTC_MODEL_CONFIG_H_