Configurable low_freq high_freq, dithering (#664)

sherpa-onnx/csrc/online-zipformer2-transducer-model.cc

@@ -403,7 +403,10 @@ OnlineZipformer2TransducerModel::GetEncoderInitStates() {
   }
 
   {
-    std::array<int64_t, 4> s{1, 128, 3, 19};
+    SHERPA_ONNX_CHECK_NE(feature_dim_, 0);
+    int32_t embed_dim = (((feature_dim_ - 1) / 2) - 1) / 2;
+    std::array<int64_t, 4> s{1, 128, 3, embed_dim};
+
     auto v = Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
     Fill(&v, 0);
     ans.push_back(std::move(v));