21 virtual uint64 count() = 0;
24 virtual ::webrtc::MediaStreamInterface* at(uint64) = 0;
27 virtual ::webrtc::MediaStreamInterface* find(::std::string
const&) = 0;
30 virtual ::webrtc::MediaStreamTrackInterface* FindAudioTrack(::std::string
const&) = 0;
33 virtual ::webrtc::MediaStreamTrackInterface* FindVideoTrack(::std::string
const&) = 0;