Add C++ runtime for vocos (#2014)

sherpa-onnx/csrc/vocos-vocoder.h

@@ -0,0 +1,39 @@
+// sherpa-onnx/csrc/vocos-vocoder.h
+//
+// Copyright (c)  2025  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_CSRC_VOCOS_VOCODER_H_
+#define SHERPA_ONNX_CSRC_VOCOS_VOCODER_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/offline-tts-model-config.h"
+#include "sherpa-onnx/csrc/vocoder.h"
+
+namespace sherpa_onnx {
+
+class VocosVocoder : public Vocoder {
+ public:
+  ~VocosVocoder() override;
+
+  explicit VocosVocoder(const OfflineTtsModelConfig &config);
+
+  template <typename Manager>
+  VocosVocoder(Manager *mgr, const OfflineTtsModelConfig &config);
+
+  /** @param mel A float32 tensor of shape (batch_size, feat_dim, num_frames).
+   *  @return Return a float32 tensor of shape (batch_size, num_samples).
+   */
+  std::vector<float> Run(Ort::Value mel) const override;
+
+ private:
+  class Impl;
+  std::unique_ptr<Impl> impl_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_VOCOS_VOCODER_H_