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Summary:
Google Colab now has torchaudio 0.12 pre-installed.
This commit removes the note about nightly build.

Pull Request resolved: https://github.com/pytorch/audio/pull/2632

Reviewed By: carolineechen

Differential Revision: D38827632

Pulled By: mthrok

fbshipit-source-id: ac769780868b741c3012357d589ec0019d9af6eb

Summary:
This commit moves the Streaming API out of prototype module.

* The related classes are renamed as following

  - `Streamer` -> `StreamReader`.
  - `SourceStream` -> `StreamReaderSourceStream`
  - `SourceAudioStream` -> `StreamReaderSourceAudioStream`
  - `SourceVideoStream` -> `StreamReaderSourceVideoStream`
  - `OutputStream` -> `StreamReaderOutputStream`

This change is preemptive measurement for the possibility to add
`StreamWriter` API.

* Replace BUILD_FFMPEG build arg with USE_FFMPEG

We are not building FFmpeg, so USE_FFMPEG is more appropriate

 ---

After https://github.com/pytorch/audio/issues/2377

Remaining TODOs: (different PRs)
- [ ] Introduce `is_ffmpeg_binding_available` function.
- [ ] Refactor C++ code:
   - Rename `Streamer` to `StreamReader`.
   - Rename `streamer.[h|cpp]` to `stream_reader.[h|cpp]`.
   - Rename `prototype.cpp` to `stream_reader_binding.cpp`.
   - Introduce `stream_reader` directory.
- [x] Enable FFmpeg in smoke test (https://github.com/pytorch/audio/issues/2381)

Pull Request resolved: https://github.com/pytorch/audio/pull/2378

Reviewed By: carolineechen

Differential Revision: D36359299

Pulled By: mthrok

fbshipit-source-id: 6a57b702996af871e577fb7addbf3522081c1328

Summary:
PyTorch Lite, which is becoming a standard for mobile PyTorch usage, does not support containers containing custom classes. Consequently, because TorchAudio's RNN-T decoder currently returns and accepts lists of `Hypothesis` namedtuples, it is not compatible with PyTorch Lite. This PR resolves said incompatibility by changing the underlying implementation of `Hypothesis` to tuple.

Pull Request resolved: https://github.com/pytorch/audio/pull/2339

Reviewed By: nateanl

Differential Revision: D35806529

Pulled By: hwangjeff

fbshipit-source-id: 9cbae5504722390511d35e7f9966af2519ccede5

Summary:
Tutorial notebooks that leverage TorchAudio prototype features don't run as-is on Google Colab due to its runtime's not having nightly builds pre-installed. To make it easier for users to run said notebooks in Colab, this PR adds a code block that installs nightly Pytorch and TorchAudio builds as a comment that users can copy and run locally.

Pull Request resolved: https://github.com/pytorch/audio/pull/2325

Reviewed By: xiaohui-zhang

Differential Revision: D35597753

Pulled By: hwangjeff

fbshipit-source-id: 59914e492ad72e31c0136a48cd88d697e8ea5f6c

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2288

Reviewed By: hwangjeff

Differential Revision: D35099492

Pulled By: mthrok

fbshipit-source-id: 955c5e617469009ae2600d2764d601d794ee916f

Summary:
https://554729-90321822-gh.circle-artifacts.com/0/docs/tutorials/online_asr_tutorial.html

1. Add figure to explain the caching
2. Fix the initialization of stream iterator

Pull Request resolved: https://github.com/pytorch/audio/pull/2226

Reviewed By: carolineechen

Differential Revision: D34265971

Pulled By: mthrok

fbshipit-source-id: 243301e74c4040f4b8cd111b363e70da60e5dae4

Summary:
Updating the context cacher so that fetched audio chunk is used for inference immediately.

https://github.com/pytorch/audio/pull/2202#discussion_r802838174

Pull Request resolved: https://github.com/pytorch/audio/pull/2213

Reviewed By: hwangjeff

Differential Revision: D34235230

Pulled By: mthrok

fbshipit-source-id: 6e4aee7cca34ca81e40c0cb13497182f20f7f04e

Summary:
* tutorial for streaming API https://541810-90321822-gh.circle-artifacts.com/0/docs/tutorials/streaming_api_tutorial.html
* tutorial for online speech recognition with Emformer RNN-T https://541810-90321822-gh.circle-artifacts.com/0/docs/tutorials/online_asr_tutorial.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2193

Reviewed By: hwangjeff

Differential Revision: D33971312

Pulled By: mthrok

fbshipit-source-id: f9b69114255f15eaf4463ca85b3efb0ba321a95f