Support streaming conformer CTC models from wenet (#427)

sherpa-onnx/csrc/online-ctc-greedy-search-decoder.h

@@ -0,0 +1,28 @@
+// sherpa-onnx/csrc/online-ctc-greedy-search-decoder.h
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_CSRC_ONLINE_CTC_GREEDY_SEARCH_DECODER_H_
+#define SHERPA_ONNX_CSRC_ONLINE_CTC_GREEDY_SEARCH_DECODER_H_
+
+#include <vector>
+
+#include "sherpa-onnx/csrc/online-ctc-decoder.h"
+
+namespace sherpa_onnx {
+
+class OnlineCtcGreedySearchDecoder : public OnlineCtcDecoder {
+ public:
+  explicit OnlineCtcGreedySearchDecoder(int32_t blank_id)
+      : blank_id_(blank_id) {}
+
+  void Decode(Ort::Value log_probs,
+              std::vector<OnlineCtcDecoderResult> *results) override;
+
+ private:
+  int32_t blank_id_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_ONLINE_CTC_GREEDY_SEARCH_DECODER_H_