Add online LSTM transducer model (#25)

sherpa-onnx/csrc/wave-reader.h

@@ -1,20 +1,6 @@
-/**
- * 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.
- */
+// sherpa/csrc/wave-reader.h
+//
+// Copyright (c)  2023  Xiaomi Corporation
 
 #ifndef SHERPA_ONNX_CSRC_WAVE_READER_H_
 #define SHERPA_ONNX_CSRC_WAVE_READER_H_
@@ -30,11 +16,15 @@ namespace sherpa_onnx {
     @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.
+    @param is_ok On return it is true if the reading succeeded; false otherwise.
 
     @return Return wave samples normalized to the range [-1, 1).
  */
 std::vector<float> ReadWave(const std::string &filename,
-                            float expected_sample_rate);
+                            float expected_sample_rate, bool *is_ok);
+
+std::vector<float> ReadWave(std::istream &is, float expected_sample_rate,
+                            bool *is_ok);
 
 }  // namespace sherpa_onnx