20 virtual uint64 count() = 0;
22 virtual ::webrtc::MediaStreamInterface* at(uint64) = 0;
24 virtual ::webrtc::MediaStreamInterface* find(::std::string
const&) = 0;
26 virtual ::webrtc::MediaStreamTrackInterface* FindAudioTrack(::std::string
const&) = 0;
28 virtual ::webrtc::MediaStreamTrackInterface* FindVideoTrack(::std::string
const&) = 0;