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stream: Make capability device IDs an JSON object

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Also change the encoding of the byte array to use hexadecimal encoding,
i.e. the byte array [100, 200] in becomes "64c8".
This commit is contained in:
Jonas Ådahl 2026-01-22 16:55:34 +01:00 • committed by Wim Taymans
parent 8600721de0
commit f2c4452e8d
5 changed files with 110 additions and 80 deletions
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7
doc/dox/internals/dma-buf.dox
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@ -365,10 +365,13 @@ with. This can be used to reduce the amount of devices that are queried for form
metadata, which can be a time consuming task, if devices needs to be woken up.
To achieve this, the consumer adds another \ref SPA_PARAM_PeerCapability item with the key
\ref PW_CAPABILITY_DEVICE_IDS set to a string of base 64 encoded `dev_t` device IDs.
\ref PW_CAPABILITY_DEVICE_IDS set to a JSON object describing what device IDs are supported.
This JSON object as of version 1 contains a single key "available-devices" that contain
a list of hexadecimal encoded `dev_t` device IDs.
```
char *device_ids = ...; /* Base 64 encoding of a dev_t. */.
char *device_ids = "{\"available-devices\": [\"6464000000000000\",\"c8c8000000000000\"]}";
&SPA_DICT_ITEMS(
SPA_DICT_ITEM(PW_CAPABILITY_DEVICE_ID_NEGOTIATION, "1"),
SPA_DICT_ITEM(PW_CAPABILITY_DEVICE_IDS, device_ids)));