Add C API for speaker embedding extractor. (#711)

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

@@ -55,14 +55,16 @@ void PybindOfflineTts(py::module *m) {
       .def(
           "generate",
           [](const PyClass &self, const std::string &text, int64_t sid,
-             float speed, std::function<void(py::array_t<float>, float)> callback)
+             float speed,
+             std::function<void(py::array_t<float>, float)> callback)
               -> GeneratedAudio {
             if (!callback) {
               return self.Generate(text, sid, speed);
             }
 
-            std::function<void(const float *, int32_t, float)> callback_wrapper =
-                [callback](const float *samples, int32_t n, float progress) {
+            std::function<void(const float *, int32_t, float)>
+                callback_wrapper = [callback](const float *samples, int32_t n,
+                                              float progress) {
                   // CAUTION(fangjun): we have to copy samples since it is
                   // freed once the call back returns.