adding a python api for offline decode (#110)

sherpa-onnx/python/csrc/offline-recognizer.cc

@@ -0,0 +1,43 @@
+// sherpa-onnx/python/csrc/offline-recognizer.cc
+//
+// Copyright (c)  2023 by manyeyes
+
+#include "sherpa-onnx/python/csrc/offline-recognizer.h"
+
+#include <string>
+#include <vector>
+
+#include "sherpa-onnx/csrc/offline-recognizer.h"
+
+namespace sherpa_onnx {
+
+
+
+static void PybindOfflineRecognizerConfig(py::module *m) {
+  using PyClass = OfflineRecognizerConfig;
+  py::class_<PyClass>(*m, "OfflineRecognizerConfig")
+      .def(py::init<const OfflineFeatureExtractorConfig &,
+                    const OfflineModelConfig &, const std::string &>(),
+           py::arg("feat_config"), py::arg("model_config"),
+           py::arg("decoding_method"))
+      .def_readwrite("feat_config", &PyClass::feat_config)
+      .def_readwrite("model_config", &PyClass::model_config)
+      .def_readwrite("decoding_method", &PyClass::decoding_method)
+      .def("__str__", &PyClass::ToString);
+}
+
+void PybindOfflineRecognizer(py::module *m) {
+  PybindOfflineRecognizerConfig(m);
+
+  using PyClass = OfflineRecognizer;
+  py::class_<PyClass>(*m, "OfflineRecognizer")
+      .def(py::init<const OfflineRecognizerConfig &>(), py::arg("config"))
+      .def("create_stream", &PyClass::CreateStream)
+      .def("decode_stream", &PyClass::DecodeStream)
+      .def("decode_streams",
+           [](PyClass &self, std::vector<OfflineStream *> ss) {
+             self.DecodeStreams(ss.data(), ss.size());
+           });
+}
+
+}  // namespace sherpa_onnx