Initial CL for this effort, with a working RTCVideoEncoder/Decoder for H264
(wrapping the VideoToolbox codec).
Some notes / things left to do:
- There are some hard-coded references to codec types that are supported by
webrtc::VideoCodec, cricket::VideoCodec, webrtc::CodecSpecificInfo etc
since we need to convert to/from these types in ObjCVideoEncoder/Decoder.
These types would need to be more codec agnostic to avoid this.
- Most interfaces are borrowed from the design document for injectable
codecs in Android. Some data in the corresponding C++ classes is discarded
when converting to the Obj-C version, since it has fewer fields. I have not
verified whether all data that we do keep is needed, or whether we might be
losing anything useful in these conversions.
- Implement the VideoToolbox codec code directly in the RTCVideoEncoderH264
classes, instead of wrapping webrtc::H264VideoToolboxEncoder / decoder.
Eliminates converting between ObjC/C++ types outside the ObjCVideoEncoder/
Decoder wrapper classes.
- List the injected codec factory's supported codecs in the list of codecs in
AppRTCMobile.
BUG=webrtc:7924
R=magjed@webrtc.org
Review-Url: https://codereview.webrtc.org/2966023002 .
Cr-Commit-Position: refs/heads/master@{#18928}
