PSA: New stats IDs, deprecation of stream stats, and less codec stats bloat

[Henrik Boström]

Hello,

RTCCodecStats optimizations

For years we've created RTCCodecStats on a per-transceiver basis often resulting in many hundreds of "codec" stats objects with duplicate information. These are now generated per-transport, which means that applications using BUNDLE can see up to a several KB reduction in their RTCStatsReport. In one example, the number of "codec" objects was reduced from 872 to 43.

Stats IDs

Stats IDs are more concise now, e.g. instead of "RTCIceCandidatePair_6cWRqicY_haEcM2xD" it's now "CP6cWRqicY_haEcM2xD". Other IDs have had similar changes.

This is just an FYI - different implementations generate stats IDs differently so please do not depend on any pattern in stats IDs. While the new pattern is predictable, at some point in the future stats IDs will become random and unpredictable according to spec.

Deprecations

Lastly, along with RTCMediaStreamTrackStats (previous PSA), RTCMediaStreamStats are also on track for deprecation. These stats have the "DEPRECATED_" prefix in their stats IDs so signify this.

[Philipp Hancke]

these changes are coming in M107 (scheduled for end of October) with commits

  https://chromiumdash.appspot.com/commit/b2be392c708c975ff5a81d8cd4dba588752a8dad

and

  https://chromiumdash.appspot.com/commit/8dfc90f94752a31db0bfde9674591996d98e0a90

respectively. Please test them out now

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[Henrik Boström]

You can expect to see more minor stats IDs tweaks happening in M108 and beyond as a result to bug fixes and optimizations in the stats collector.