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* Fixed some ffmpeg deprecation warnings in decoder

* Fixed clang error
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Fixed comparison warnings in audio_stream and video_stream

* Fixed clang error

This reverts commit f6b6b510.

* Fixed read_image bug

* Removed unused import

* Skip tests if cv2 unavailable

* Removed cv2 dependency

* remove unused functions

* shut up annoying warnings via cast

* prabhat's comments

* Fixed clang format error
Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

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

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

Co-authored-by: James Thewlis <james@unitary.ai>

This reverts commit 3bfdb427.

* multithreading allowed in stream codec context

* numThreads is passed as a decoder parameter. At this stage code should be unchanged

* enabling multithreading in videoReader API

* moving defaults to header files

* replace long with int64_t because torchscript

* docstring for Num threads

* Enable codec-related heuristics as defaults

* Update torchvision/csrc/io/decoder/stream.cpp
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Fixing build errors

* minor docs

* Linting

* updating defaults for the C++ function calls to be single threaded

* adding special case for single threaded stuff
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Stash commit

* Refactoring the current tests in a simpler file

* Addressing Francisco's comments, attempt 1

* Remove old tests

* audio changes

* adding some comments

* Stash commit

* Refactoring the current tests in a simpler file

* Addressing Francisco's comments, attempt 1

* Remove old tests

* audio changes

* adding some comments

* adding the py39 check stuff
Co-authored-by: Bruno Korbar <korbar@vggdev9.vggdev.cluster>
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

Summary:
Noticed this copy-paste error while reading D26026259 (https://github.com/pytorch/vision/commit/f16322b596c7dc9e9d67d3b40907694f29e16357) for inspiration to solve a similar problem

Created from Diffusion's 'Open in Editor' feature.

Reviewed By: datumbox

Differential Revision: D26373056

fbshipit-source-id: d67f46243a280e8a59d12bad9dd730c1a3d512c9

* Moving jpegcommon inside cpu implementation

* Adding namespaces on image and moving private methods to anonymous.

* Fixing headers.

* Renaming public image methods to match the ones on python.

* Refactoring to remove the double ifs in common_jpeg.h

* Moving registration of video methods in Video.cpp and removing unnecessary includes.

* Rename files according to cpp styles.

* Adding namespaces and moving private methods to anonymous namespaces.

* Syncing method names.

* Fixing minor issues.

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

Summary:
Upgrading service to platform009 enforces tls1.3 authentication.
Specify tls cert file to decoder through config.
Context: https://fb.workplace.com/groups/2020511478062223

Differential Revision: D26026259

fbshipit-source-id: e89f88ff7e41ec6b6a62e85d9015d78f6377aa65

The video reader suppressed code 61 (ENODATA on Linux) that occured at
the end of a stream and logged an INFO message. On macOS ENODATA has a
different code (96), which resulted in an error message being logged.

This small patch replaces the hard-coded value with the ENODATA constant
to suppress the macOS warning.
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update ImageReadMode error messages, add newline at the end of image_read_mode.h, replace define with const in image_read_mode.h, add documentation to ImageReadMode enum

* Update readpng_cpu and readjpeg_cpu error messages

* Update image.py documentation

Summary:
* Reduce unnecessary header inclusions in models and io.

* Move autocast to separate folder and hide autograd implementation in an anonymous namespace.

* Moving files in subfolders.

Reviewed By: fmassa

Differential Revision: D25461523

fbshipit-source-id: 756eeb6848aacaa474de4825ed4c1045d17e2cea