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Summary:
Introduced in hotfix https://github.com/pytorch/audio/issues/2964

Pull Request resolved: https://github.com/pytorch/audio/pull/2966

Reviewed By: carolineechen

Differential Revision: D42385913

Pulled By: mthrok

fbshipit-source-id: 6c42dbfbb914b0329c09a1bca591f11cf2e3c1a6

Summary:
Follow-up of f70b970a

Pull Request resolved: https://github.com/pytorch/audio/pull/2964

Reviewed By: xiaohui-zhang

Differential Revision: D42380451

Pulled By: mthrok

fbshipit-source-id: 0569a32be576042ab419b363e694fe7d2db1feb0

Summary:
This commit makes the following changes to the C++ library organization
- Move sox-related feature implementations from `libtorchaudio` to `libtorchaudio_sox`.
- Remove C++ implementation of `is_sox_available` and `is_ffmpeg_available` as it is now sufficient to check the existence of `libtorchaudio_sox` and `libtorchaudio_ffmpeg` to check the availability. This makes `libtorchaudio_sox` and `libtorchaudio_ffmpeg` independent from `libtorchaudio`.
- Move PyBind11-based bindings (`_torchaudio_sox`, `_torchaudio_ffmpeg`) into `torchaudio.lib` so that the built library structure is less cluttered.

Background:
Originally, when the `libsox` was the only C++ extension and `libtorchaudio` was supposed to contain all the C++ code.
The things are different now. We have a bunch of C++ extensions and we need to make the code/build structure more modular.

The new `libtorchaudio_sox` contains the implementations and `_torchaudio_sox` contains the PyBin11-based bindings.

Pull Request resolved: https://github.com/pytorch/audio/pull/2929

Reviewed By: hwangjeff

Differential Revision: D42159594

Pulled By: mthrok

fbshipit-source-id: 1a0fbca9e4143137f6363fc001b2378ce6029aa7

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/2096

run: `arc lint --apply-patches --paths-cmd 'hg files -I "./**/*.py"'`

Reviewed By: mthrok

Differential Revision: D33297351

fbshipit-source-id: 7bf5956edf0717c5ca90219f72414ff4eeaf5aa8

`torchaudio` treats `soundfile` as an optional dependency, and it assumes either `soundfile` is properly installed or it is not installed at all. However, there is a third state where `soundfile` is installed but the backing library `libsndfile` is not installed, and in this case, `import torchaudio` fails.

This commit resolves it by further checking if `soundfile` is importable. 

See also: https://github.com/pytorch/audio/issues/1687

* Replace `backed_guard` with `requires_module`

* Remove backend_guard