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Summary:
Part of https://github.com/pytorch/audio/issues/2164.
Removes debug code and associated arguments/fields left in previous PRs.

Pull Request resolved: https://github.com/pytorch/audio/pull/2168

Reviewed By: hwangjeff

Differential Revision: D33712999

Pulled By: mthrok

fbshipit-source-id: 0729e9fbc146c48887379b6231e4d6e8cb520c44

Summary:
MSVS is strict on header and would not allow `std::runtime_error`
without `<stdexcept>`.

Also this commit removes the stray `"libavutil/frame.h"`,
inserted by IDE, which I missed.

Ref https://github.com/pytorch/audio/issues/2124

Pull Request resolved: https://github.com/pytorch/audio/pull/2135

Reviewed By: carolineechen

Differential Revision: D33419120

Pulled By: mthrok

fbshipit-source-id: 328e723b70a3608133d9ddef9fc4a95e5d90e61d

Summary:
Part of https://github.com/pytorch/audio/issues/1986. Splitting the PR for easier review.

Add StreamProcessor class that bundles `Buffer`, `FilterGraph` and `Decoder`.
Note: The API to retrieve the buffered Tensors is tentative.
For the overall architecture, see https://github.com/mthrok/audio/blob/ffmpeg/torchaudio/csrc/ffmpeg/README.md.

Note: Without a change to build process, the code added here won't be compiled. The build process will be updated later.
Needs to be imported after https://github.com/pytorch/audio/issues/2044.

Pull Request resolved: https://github.com/pytorch/audio/pull/2045

Reviewed By: carolineechen

Differential Revision: D33299858

Pulled By: mthrok

fbshipit-source-id: d85bececed475f45622743f137dd59cb1390ceed