S24LE and S32LE format equivalency

[Marios Sioutis]

Hi all,

Quick question, I was troubleshooting a 24bit USB device and got down 
the rabbit hole of sample formats. The device advertises itself as S24LE 
(4byte payload) but it appears as S32LE under alsa, something that 
bothered me a lot initially. However, If the conversion between the two 
formats is to just << 8 i.e. put a zero byte as LSB, then the two 
formats are essentially equivalent.

Is this actually the case? If yes, who performs the conversion? Is it on 
the alsa side, or the device already adds a zero byte LSB?

Thank you in advance,

Marios