18 using PipelineBuilder = std::shared_ptr<webrtc::Call>;
19 using WeakPipelineBuilder = std::weak_ptr<webrtc::Call>;
21 static const char* kAudioStreamTrackId =
"audio_stream_track_id";
22 static const char* kVideoMajorStreamTrackId =
"video_major_stream_track_id";
23 static const char* kVideoMinorStreamTrackId =
"video_minor_stream_track_id";