{
  "name": "custom-layout-show",
  "sources": [
    {
      "name": "room_src",
      "type": "livekit",
      "config": {
        "serverUrl": "wss://your-project.livekit.cloud",
        "token": "eyJ..."
      }
    }
  ],
  "nodes": [
    {
      "name": "mix_video",
      "type": "video_mixer",
      "inputs": [
        "room_src"
      ],
      "config": {
        "canvas": {
          "width": 1920,
          "height": 1080,
          "backgroundColor": "#0f0f23",
          "coordinateSystem": "ratio"
        },
        "layout": {
          "mode": "custom",
          "common": {
            "borderRadius": 12
          },
          "custom": {
            "regions": [
              {
                "name": "main_view",
                "source": {
                  "identity": "host"
                },
                "width": 0.75,
                "height": 1,
                "style": {
                  "borderRadius": 16,
                  "borderColor": "#ffd700",
                  "borderWidth": 2
                },
                "placeholder": {
                  "image": {
                    "url": "https://cdn.example.com/host-avatar.png",
                    "borderRadius": 999,
                    "width": 0.4,
                    "height": 0.4,
                    "fit": "cover"
                  },
                  "text": {
                    "content": "\u7b49\u5f85\u4e3b\u6301\u4eba...",
                    "position": "bottom",
                    "color": "#888"
                  }
                }
              },
              {
                "name": "guest_1",
                "source": {
                  "index": 0
                },
                "offsetX": 0.75,
                "width": 0.25,
                "height": 0.333,
                "style": {
                  "borderRadius": 12,
                  "backgroundColor": "#2d2d44"
                }
              },
              {
                "name": "guest_2",
                "source": {
                  "index": 1
                },
                "offsetX": 0.75,
                "offsetY": 0.333,
                "width": 0.25,
                "height": 0.334,
                "style": {
                  "borderRadius": 12,
                  "backgroundColor": "#2d2d44"
                }
              },
              {
                "name": "guest_3",
                "source": {
                  "index": 2
                },
                "offsetX": 0.75,
                "offsetY": 0.667,
                "width": 0.25,
                "height": 0.333,
                "style": {
                  "borderRadius": 12,
                  "backgroundColor": "#2d2d44"
                }
              }
            ]
          }
        }
      }
    },
    {
      "name": "mix_audio",
      "type": "audio_mixer",
      "inputs": [
        "room_src"
      ],
      "config": {}
    }
  ],
  "sinks": [
    {
      "name": "rtmp_out",
      "type": "rtmp_push",
      "inputs": [
        "mix_video",
        "mix_audio"
      ],
      "config": {
        "urls": [
          "rtmp://live.example.com/app/show-key"
        ]
      }
    }
  ]
}