Add C++ and Python API for Dolphin CTC models (#2085)

sherpa-onnx/csrc/offline-dolphin-model-config.cc

@@ -0,0 +1,35 @@
+// sherpa-onnx/csrc/offline-dolphin-model-config.cc
+//
+// Copyright (c)  2025  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/offline-dolphin-model-config.h"
+
+#include "sherpa-onnx/csrc/file-utils.h"
+#include "sherpa-onnx/csrc/macros.h"
+
+namespace sherpa_onnx {
+
+void OfflineDolphinModelConfig::Register(ParseOptions *po) {
+  po->Register("dolphin-model", &model,
+               "Path to model.onnx of Dolphin CTC branch.");
+}
+
+bool OfflineDolphinModelConfig::Validate() const {
+  if (!FileExists(model)) {
+    SHERPA_ONNX_LOGE("Dolphin model '%s' does not exist", model.c_str());
+    return false;
+  }
+
+  return true;
+}
+
+std::string OfflineDolphinModelConfig::ToString() const {
+  std::ostringstream os;
+
+  os << "OfflineDolphinModelConfig(";
+  os << "model=\"" << model << "\")";
+
+  return os.str();
+}
+
+}  // namespace sherpa_onnx