Add C++ runtime for speech enhancement GTCRN models (#1977)

See also https://github.com/Xiaobin-Rong/gtcrn

sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model.h

@@ -0,0 +1,42 @@
+// sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model.h
+//
+// Copyright (c)  2025  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_GTCRN_MODEL_H_
+#define SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_GTCRN_MODEL_H_
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model-meta-data.h"
+#include "sherpa-onnx/csrc/offline-speech-denoiser-model-config.h"
+#include "sherpa-onnx/csrc/offline-speech-denoiser.h"
+
+namespace sherpa_onnx {
+
+class OfflineSpeechDenoiserGtcrnModel {
+ public:
+  ~OfflineSpeechDenoiserGtcrnModel();
+  explicit OfflineSpeechDenoiserGtcrnModel(
+      const OfflineSpeechDenoiserModelConfig &config);
+
+  template <typename Manager>
+  OfflineSpeechDenoiserGtcrnModel(
+      Manager *mgr, const OfflineSpeechDenoiserModelConfig &config);
+
+  using States = std::vector<Ort::Value>;
+
+  States GetInitStates() const;
+
+  std::pair<Ort::Value, States> Run(Ort::Value x, States states) const;
+
+  const OfflineSpeechDenoiserGtcrnModelMetaData &GetMetaData() const;
+
+ private:
+  class Impl;
+  std::unique_ptr<Impl> impl_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_GTCRN_MODEL_H_