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Summary:
Preparation for upcoming change where load/info function will use fallback
if sox_io backend cannot handle the input.

Pull Request resolved: https://github.com/pytorch/audio/pull/2416

Reviewed By: carolineechen

Differential Revision: D36736969

Pulled By: mthrok

fbshipit-source-id: f804cfda3678f13bf0c2f6557a2f82ae42ae3c03

Applies style fixes identified in fbcode.

This PR moves the code related to PyBind11 to the dedicated directory `torchaudio/csrc/pybind`.

Before, features related to PyBind11 (I/O for file-like object) was implemented in `torchaudio/csrc/sox` and the binding was defined in `torchaudio/csrc/pybind.cpp`. We used macro definition `TORCH_API_INCLUDE_EXTENSION_H` to turn on/off the feature, in addition to including/excluding `torchaudio/csrc/pybind.cpp` in the list of compiled source.

In the previous manner, in C++ example, one had to rebuild libtorchaudio separately, but by splitting them completely at compile time, it should conceptually possible to distribute libtorchaudio within torchaudio Python package and reuse it for C++ example.

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51319



We were going out of our way to accommodate `IValue::to<Tensor>` returning a copy of the inner Tensor. `IValue::toTensor` is capable of returning a reference without copying, so if we use it directly, we can allow kernels that want to take `Tensor &` to do so!
As a bonus, we get reduced build times.
ghstack-source-id: 121378961

Reviewed By: bhosmer

Differential Revision: D26138549

fbshipit-source-id: b0f830527da360c542c815bef2f7e1692615b32a
Co-authored-by: Scott Wolchok <swolchok@fb.com>

After a9f5e7229 was merged into upstream pytorch the passing of
references within torch c extension functions is no longer allowed. This
just removes the reference and passes by value instead.
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>

Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

* Add sox_utils module

* Make init/shutdown thread safe

* Add sox effects implementation

* Add test for sox effects

* Update docstrings and add examples