Am 04.06.19 um 17:05 schrieb Ser, Simon:
Hi, I'm trying to link ALSA playback devices and DRM connectors. In other words, I'd like to be able to know which ALSA device I should open to play audio on a given connector. Unfortunately, I haven't found a way to extract this information. I know /proc/asound/cardN/eld* expose the EDID-like data. However by looking at the ALSA API (also: aplay -l and -L) I can't find a way to figure out which PCM device maps to the ELD. Am I missing something?
Is that actually fixed on all hardware? Or do we maybe have some hardware with only one audio codec and multiple connectors?
If not, what would be the best way to expose this? - A symlink to the ALSA audio PCM device in /sys/class/drm/cardN-CONNECTOR? - A symlink to the DRM connector in /sys/class/sound/pcm*?
If it's fixed than those two options sound sane to me.
- A DRM connector property?
If it's configurable than that sounds like a good option to me. Anyway added our DC team, stuff like that is their construction site. Regards, Christian.
- Somehow expose the connector name via the ALSA API? - Expose the connector EDID via ALSA? - Other ideas? Thanks! Simon Ser _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
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