Warppipe Configuration Schema

Warppipe uses JSON for configuration persistence. The config file stores virtual nodes and routing rules using stable identifiers (names, not serial IDs).

Schema Version 1

{
  "version": 1,
  "virtual_nodes": [
    {
      "name": "warppipe-gaming-sink",
      "is_source": false,
      "rate": 48000,
      "channels": 2,
      "loopback": false,
      "target_node": ""
    },
    {
      "name": "warppipe-mic-source",
      "is_source": true,
      "rate": 48000,
      "channels": 2,
      "loopback": false,
      "target_node": ""
    },
    {
      "name": "warppipe-loopback",
      "is_source": false,
      "rate": 48000,
      "channels": 2,
      "loopback": true,
      "target_node": "alsa_output.pci-0000_00_1f.3.analog-stereo"
    }
  ],
  "route_rules": [
    {
      "match": {
        "application_name": "Firefox",
        "process_binary": "firefox",
        "media_role": ""
      },
      "target_node": "warppipe-gaming-sink"
    },
    {
      "match": {
        "application_name": "discord",
        "process_binary": "",
        "media_role": "Communication"
      },
      "target_node": "alsa_output.usb-headset"
    }
  ]
}

Field Descriptions

virtual_nodes

name (string, required): Unique node name (PW_KEY_NODE_NAME)
is_source (boolean, required): true for Audio/Source, false for Audio/Sink
rate (integer, default 48000): Sample rate in Hz
channels (integer, default 2): Channel count
loopback (boolean, default false): Whether node forwards to a target
target_node (string, optional): Required when loopback is true

route_rules

Rules match ephemeral audio sources to target sinks by stable application metadata.

match.application_name (string): Match PW_KEY_APP_NAME
match.process_binary (string): Match PW_KEY_APP_PROCESS_BINARY
match.media_role (string): Match PW_KEY_MEDIA_ROLE
target_node (string, required): Destination node name

All non-empty match fields must match (AND logic). At least one match field must be non-empty.

Persistence Behavior

Auto-save: When ConnectionOptions::config_path is set, config is saved after:
- Virtual node created/removed
- Routing rule added/removed
Load on startup: When config_path is set and the file exists, it is loaded during Client::Create() after connection is established.
Manual: SaveConfig(path) and LoadConfig(path) work independently of auto-save.
Atomic writes: Saves write to a .tmp file first, then rename for crash safety.

Error Handling

Missing config file on auto-load: Silently ignored (fresh start)
Invalid JSON syntax: StatusCode::kInvalidArgument with parse error details
Missing version field: StatusCode::kInvalidArgument
Empty path: StatusCode::kInvalidArgument
File not found on manual load: StatusCode::kNotFound

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