Support RKNN for Zipformer CTC models. (#1948)

sherpa-onnx/csrc/rknn/utils.h

@@ -0,0 +1,23 @@
+// sherpa-onnx/csrc/utils.h
+//
+// Copyright      2025  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_CSRC_RKNN_UTILS_H_
+#define SHERPA_ONNX_CSRC_RKNN_UTILS_H_
+
+#include <string>
+#include <unordered_map>
+
+#include "rknn_api.h"  // NOLINT
+
+namespace sherpa_onnx {
+void ConvertNCHWtoNHWC(const float *src, int32_t n, int32_t channel,
+                       int32_t height, int32_t width, float *dst);
+
+std::string ToString(const rknn_tensor_attr &attr);
+
+std::unordered_map<std::string, std::string> Parse(
+    const rknn_custom_string &custom_string);
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_RKNN_UTILS_H_