Add Python ASR examples with alsa (#646)

sherpa-onnx/python/csrc/alsa.cc

@@ -0,0 +1,30 @@
+// sherpa-onnx/python/csrc/alsa.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include "sherpa-onnx/python/csrc/alsa.h"
+
+#include <vector>
+
+#include "sherpa-onnx/csrc/alsa.h"
+
+namespace sherpa_onnx {
+
+void PybindAlsa(py::module *m) {
+  using PyClass = Alsa;
+  py::class_<PyClass>(*m, "Alsa")
+      .def(py::init<const char *>(), py::arg("device_name"),
+           py::call_guard<py::gil_scoped_release>())
+      .def(
+          "read",
+          [](PyClass &self, int32_t num_samples) -> std::vector<float> {
+            return self.Read(num_samples);
+          },
+          py::arg("num_samples"), py::call_guard<py::gil_scoped_release>())
+      .def_property_readonly("expected_sample_rate",
+                             &PyClass::GetExpectedSampleRate)
+      .def_property_readonly("actual_sample_rate",
+                             &PyClass::GetActualSampleRate);
+}
+
+}  // namespace sherpa_onnx