Support adding punctuations to the speech recogntion result (#761)

sherpa-onnx/csrc/offline-punctuation.h

@@ -0,0 +1,47 @@
+// sherpa-onnx/csrc/offline-punctuation.h
+//
+// Copyright (c)  2024  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_OFFLINE_PUNCTUATION_H_
+#define SHERPA_ONNX_CSRC_OFFLINE_PUNCTUATION_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "sherpa-onnx/csrc/offline-punctuation-model-config.h"
+#include "sherpa-onnx/csrc/parse-options.h"
+
+namespace sherpa_onnx {
+
+struct OfflinePunctuationConfig {
+  OfflinePunctuationModelConfig model;
+
+  OfflinePunctuationConfig() = default;
+
+  explicit OfflinePunctuationConfig(const OfflinePunctuationModelConfig &model)
+      : model(model) {}
+
+  void Register(ParseOptions *po);
+  bool Validate() const;
+
+  std::string ToString() const;
+};
+
+class OfflinePunctuationImpl;
+
+class OfflinePunctuation {
+ public:
+  explicit OfflinePunctuation(const OfflinePunctuationConfig &config);
+
+  ~OfflinePunctuation();
+
+  // Add punctuation to the input text and return it.
+  std::string AddPunctuation(const std::string &text) const;
+
+ private:
+  std::unique_ptr<OfflinePunctuationImpl> impl_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_OFFLINE_PUNCTUATION_H_