Add TTS with VITS (#360)

sherpa-onnx/csrc/offline-tts-vits-model.h

@@ -0,0 +1,45 @@
+// sherpa-onnx/csrc/offline-tts-vits-model.h
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_CSRC_OFFLINE_TTS_VITS_MODEL_H_
+#define SHERPA_ONNX_CSRC_OFFLINE_TTS_VITS_MODEL_H_
+
+#include <memory>
+#include <string>
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/offline-tts-model-config.h"
+
+namespace sherpa_onnx {
+
+class OfflineTtsVitsModel {
+ public:
+  ~OfflineTtsVitsModel();
+
+  explicit OfflineTtsVitsModel(const OfflineTtsModelConfig &config);
+
+  /** Run the model.
+   *
+   * @param x A int64 tensor of shape (1, num_tokens)
+   * @return Return a float32 tensor containing audio samples. You can flatten
+   *         it to a 1-D tensor.
+   */
+  Ort::Value Run(Ort::Value x);
+
+  // Sample rate of the generated audio
+  int32_t SampleRate() const;
+
+  // true to insert a blank between each token
+  bool AddBlank() const;
+
+  std::string Punctuations() const;
+
+ private:
+  class Impl;
+  std::unique_ptr<Impl> impl_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_OFFLINE_TTS_VITS_MODEL_H_