Henrik Boström ce33b6a4cf Implement QualityLimitationReasonTracker and expose "reason".
This CL implements the logic behind qualityLimitationReason[1] and
qualityLimitationDurations[2]

This CL also exposes qualityLimitationReason in the standard getStats()
API, but does not expose qualityLimitationDurations because that is
blocked on supporting the "record<>" type in RTCStatsMember[3].

[1] https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats-qualitylimitationreason
[2] https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats-qualitylimitationdurations
[3] https://crbug.com/webrtc/10685

TBR=stefan@webrtc.org

Bug: webrtc:10451, webrtc:10686
Change-Id: Ifff0be4ddd64eaec23d59c02af99fdbb1feb3841
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/138825
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28090}
2019-05-28 16:23:55 +00:00
..
2019-04-12 07:36:49 +00:00
2019-05-24 18:17:37 +00:00
2019-01-25 20:29:58 +00:00
2019-02-01 13:24:47 +00:00

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.