This required a fairly extensive overhaul:
* Removed locks from the implementation.
The filter/pin architecture does use multiple threads,
but the state is controlled on one and synchronization
is done via flags that don't require locking.
Note though that the baseclasses used a lot of locking, it's unclear why,
but perhaps there are things I'm not aware of. The locking was not done
consistently though, which doesn't seem to have been a problem.
* Change the code to not mix AddRef/Release and use of explicit 'delete'.
* Removed implementations of interfaces we don't need/use.
* Similarly some methods now return E_NOTIMPL.
* Added some utilities to make use of COM interfaces and concepts, easier.
BUG=webrtc:10374
TBR=mbonadei@webrtc.org
Change-Id: Iaedb1157d37ef5d5c75f727dba3d7de75ce22cd8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/125086
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Christian Fremerey <chfremer@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27072}
30e60d6fd9