1{ 2 "offer": { 3 "castMode": "mirroring", 4 "receiverGetStatus": true, 5 "supportedStreams": [ 6 { 7 "aesIvMask": "64A6AAC2821880145271BB15B0188821", 8 "aesKey": "65386FD9BCC30BC7FB6A4DD1D3B0FA5E", 9 "bitRate": 102000, 10 "channels": 2, 11 "codecName": "opus", 12 "index": 0, 13 "receiverRtcpEventLog": true, 14 "rtpExtensions": ["adaptive_playout_delay"], 15 "rtpPayloadType": 127, 16 "rtpProfile": "cast", 17 "sampleRate": 48000, 18 "ssrc": 264890, 19 "targetDelay": 400, 20 "timeBase": "1/48000", 21 "type": "audio_source" 22 }, 23 { 24 "aesIvMask": "64A6AAC2821880145271BB15B0188821", 25 "aesKey": "65386FD9BCC30BC7FB6A4DD1D3B0FA5E", 26 "codecName": "vp8", 27 "index": 1, 28 "maxBitRate": 5000000, 29 "maxFrameRate": "30000/1000", 30 "receiverRtcpEventLog": true, 31 "renderMode": "video", 32 "resolutions": [{"height": 1080, "width": 1920}], 33 "rtpExtensions": ["adaptive_playout_delay"], 34 "rtpPayloadType": 96, 35 "rtpProfile": "cast", 36 "ssrc": 748229, 37 "targetDelay": 400, 38 "timeBase": "1/90000", 39 "type": "video_source" 40 } 41 ] 42 }, 43 "seqNum": 0, 44 "type": "OFFER" 45}