Joe Downing 87bcc1cab9 Adding some AV1 constants and helper functions
I've added a basic AV1 impl to Chrome Remote Desktop and am looking into
what is needed to test with I444 (Profile-1) in our platform. This CL
adds a few helper functions, constants, and enums that can be used to
configure the SDP with different AV1 profiles. More work is still needed
but I wanted to get this in place first so I can build on it in the CRD
host code.

Change-Id: I1af9ebf31f833138e8c36e0c0a30e32289e7b58e
Bug: chromium:1329660
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264000
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Joe Downing <joedow@google.com>
Cr-Commit-Position: refs/heads/main@{#37182}
2022-06-10 16:39:54 +00:00
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How to write code in the api/ directory

Mostly, just follow the regular style guide, but:

  • Note that api/ code is not exempt from the “.h and .cc files come in pairs” rule, so if you declare something in api/path/to/foo.h, it should be defined in api/path/to/foo.cc.
  • Headers in api/ should, if possible, not #include headers outside api/. Its not always possible to avoid this, but be aware that it adds to a small mountain of technical debt that were trying to shrink.
  • .cc files in api/, on the other hand, are free to #include headers outside api/.

That is, the preferred way for api/ code to access non-api/ code is to call it from a .cc file, so that users of our API headers wont transitively #include non-public headers.

For headers in api/ that need to refer to non-public types, forward declarations are often a lesser evil than including non-public header files. The usual rules still apply, though.

.cc files in api/ should preferably be kept reasonably small. If a substantial implementation is needed, consider putting it with our non-public code, and just call it from the api/ .cc file.