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[torchcodec] initial version of simple video decoder #42

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[torchcodec] initial version of simple video decoder #42

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@scotts scotts commented Jun 18, 2024

Summary:
Initial version of SimpleVideoDecoder. This diff supports:

  1. Creating a simple decoder from file or tensor.
  2. Accessing frames through random access: decoder[i]. Internally, this gets a frame by index.
  3. Iterating over all available frames: for frame in decoder. Internally, this calls the core library function to get the next frame.

I did not implement slice semantics for random access yet. I think that in order to support that best we'll need to add new capabilities in the core API to support getting a batch of frames from a range. We could use get_frames_by_indices, but we would end up creating very large lists.

This is a partial implementation of the design: https://fburl.com/gdoc/hxotv2by

Reviewed By: NicolasHug, ahmadsharif1

Differential Revision: D58605628

@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Meta Open Source bot. label Jun 18, 2024
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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request was exported from Phabricator. Differential Revision: D58605628

Summary:
Pull Request resolved: #42

Initial version of `SimpleVideoDecoder`. This diff supports:
1. Creating a simple decoder from file or tensor.
2. Accessing frames through random access: `decoder[i]`. Internally, this gets a frame by index.
3. Iterating over all available frames: `for frame in decoder`. Internally, this calls the core library function to get the next frame.

I did not implement slice semantics for random access yet. I think that in order to support that best we'll need to add new capabilities in the core API to support getting a batch of frames from a range. We *could* use `get_frames_by_indices`, but we would end up creating very large lists.

This is a partial implementation of the design: https://fburl.com/gdoc/hxotv2by

Reviewed By: NicolasHug, ahmadsharif1

Differential Revision: D58605628
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This pull request was exported from Phabricator. Differential Revision: D58605628

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This pull request has been merged in d4b0111.

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