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I could not get pipeswitch to match some ports, and I was getting these errors in logs:
```
Nov 20 06:28:56 hostname pipeswitchd[21760]: 2025-11-20T06:28:56+09:00 - ERROR - channel not valid: UNK
```
It turned out the port of our application had `audio.channel` set to `UNK` for some reason:
```json
{
"id": 156,
"type": "PipeWire:Interface:Port",
"version": 3,
"permissions": [ "r", "x", "m" ],
"info": {
"direction": "output",
"change-mask": [ "props", "params" ],
"props": {
"audio.channel": "UNK",
"format.dsp": "32 bit float mono audio",
"node.id": 146,
"object.id": 156,
"object.path": "tonari-main-playback:output_3",
"object.serial": 1450,
"port.alias": "tonari-main-playback:output_4",
"port.direction": "out",
"port.group": "stream.0",
"port.id": 3,
"port.name": "output_4"
},
"params": {
"EnumFormat": [
{
"mediaType": "audio",
"mediaSubtype": "dsp",
"format": "F32P"
}
],
"Meta": [
{
"type": "Header",
"size": 32
}
],
"IO": [
{
"id": "Buffers",
"size": 8
},
{
"id": "AsyncBuffers",
"size": 8
}
],
"Format": [ ],
"Buffers": [ ],
"Latency": [
{
"direction": "Input",
"minQuantum": 0.000000,
"maxQuantum": 0.000000,
"minRate": 0,
"maxRate": 0,
"minNs": 0,
"maxNs": 0
},
{
"direction": "Output",
"minQuantum": 0.000000,
"maxQuantum": 0.000000,
"minRate": 0,
"maxRate": 0,
"minNs": 0,
"maxNs": 0
}
],
"Tag": [
]
}
}
}
```
Instead of returning Err, return Ok(None), which activates the fallback one level higher, which does the right thing.
Author
|
Actually I'm getting more errors now for different devices: Now I see there are many channels and spa methods to convert between their integer and string representations: https://pipewire.pages.freedesktop.org/pipewire-rs/libspa/index.html?search=spa_audio_channel But I don't think we need to deal with that: it should fine to represent them as Strings. I'll give it a try. |
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I could not get pipeswitch to match some ports, and I was getting these errors in logs:
It turned out the port of our application had
audio.channelset toUNKfor some reason:{ "id": 156, "type": "PipeWire:Interface:Port", "version": 3, "permissions": [ "r", "x", "m" ], "info": { "direction": "output", "change-mask": [ "props", "params" ], "props": { "audio.channel": "UNK", "format.dsp": "32 bit float mono audio", "node.id": 146, "object.id": 156, "object.path": "tonari-main-playback:output_3", "object.serial": 1450, "port.alias": "tonari-main-playback:output_4", "port.direction": "out", "port.group": "stream.0", "port.id": 3, "port.name": "output_4" }, "params": { "EnumFormat": [ { "mediaType": "audio", "mediaSubtype": "dsp", "format": "F32P" } ], "Meta": [ { "type": "Header", "size": 32 } ], "IO": [ { "id": "Buffers", "size": 8 }, { "id": "AsyncBuffers", "size": 8 } ], "Format": [ ], "Buffers": [ ], "Latency": [ { "direction": "Input", "minQuantum": 0.000000, "maxQuantum": 0.000000, "minRate": 0, "maxRate": 0, "minNs": 0, "maxNs": 0 }, { "direction": "Output", "minQuantum": 0.000000, "maxQuantum": 0.000000, "minRate": 0, "maxRate": 0, "minNs": 0, "maxNs": 0 } ], "Tag": [ ] } } }Instead of returning Err, return Ok(None), which activates the fallback one level higher, which does the right thing.
This fixes pipeswitch operation for our use-case. tonari internal reference: https://github.com/tonarino/portal/pull/5717#issuecomment-3554248816