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-config.cc

@@ -0,0 +1,40 @@
+// sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model-config.cc
+//
+// Copyright (c)  2025  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model-config.h"
+
+#include <string>
+
+#include "sherpa-onnx/csrc/file-utils.h"
+#include "sherpa-onnx/csrc/macros.h"
+
+namespace sherpa_onnx {
+
+void OfflineSpeechDenoiserGtcrnModelConfig::Register(ParseOptions *po) {
+  po->Register("speech-denoiser-gtcrn-model", &model,
+               "Path to the gtcrn model for speech denoising");
+}
+
+bool OfflineSpeechDenoiserGtcrnModelConfig::Validate() const {
+  if (model.empty()) {
+    SHERPA_ONNX_LOGE("Please provide --speech-denoiser-gtcrn-model");
+    return false;
+  }
+
+  if (!FileExists(model)) {
+    SHERPA_ONNX_LOGE("gtcrn model file '%s' does not exist", model.c_str());
+    return false;
+  }
+  return true;
+}
+
+std::string OfflineSpeechDenoiserGtcrnModelConfig::ToString() const {
+  std::ostringstream os;
+
+  os << "OfflineSpeechDenoiserGtcrnModelConfig(";
+  os << "model=\"" << model << "\")";
+  return os.str();
+}
+
+}  // namespace sherpa_onnx