Refactor the code (#15)

* code refactoring

* Remove reference files

* Update README and CI

* small fixes

* fix style issues

* add style check for CI

* fix style issues

* remove kaldi-native-io

sherpa-onnx/csrc/wave-reader.h

@@ -0,0 +1,41 @@
+/**
+ * Copyright      2022  Xiaomi Corporation (authors: Fangjun Kuang)
+ *
+ * See LICENSE for clarification regarding multiple authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SHERPA_ONNX_CSRC_WAVE_READER_H_
+#define SHERPA_ONNX_CSRC_WAVE_READER_H_
+
+#include <istream>
+#include <string>
+#include <vector>
+
+namespace sherpa_onnx {
+
+/** Read a wave file with expected sample rate.
+
+    @param filename Path to a wave file. It MUST be single channel, PCM encoded.
+    @param expected_sample_rate  Expected sample rate of the wave file. If the
+                               sample rate don't match, it throws an exception.
+
+    @return Return wave samples normalized to the range [-1, 1).
+ */
+std::vector<float> ReadWave(const std::string &filename,
+                            float expected_sample_rate);
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_WAVE_READER_H_