about bap_broadcast_sink example

[heavyjo]

here is 2 question for this example. (v2.9.0)

as i looking for this example, there are some limitations like belows.

• One BIG, one of the two BIS streams (selectable).

then i have a question, is it a hardware limitation? or just fw limitation?

and this example used a 16bit resolution.
could i changed that bit resolution to 24bit? 

[Maria Gilje]

Hello,

I will start with a slight clarification on the sample: the bap_broadcast_sink sample (zephyr/samples/bluetooth/bap_broadcast_sink) is not the same as the nRF5340 Aduio: Broadcast sink application (nrf/applications/nrf5340_audio/broadcast_sink).

and this example used a 16bit resolution.
could i changed that bit resolution to 24bit? 

The answer to this question may differ depending on which sample you are using, so please clarify if you mean to use the nRF5340 Audio application or the Broadcast Audio Sink Zephyr sample.

• One BIG, one of the two BIS streams (selectable).

then i have a question, is it a hardware limitation? or just fw limitation?

I am fairly certain that this is an application limitation, so I will double check this and reply properly when you clarify which sample you are asking about.

Best regards,

Maria

[heavyjo]

i'm sorry that confuse you.
i'm using first one, (zephyr/samples/bluetooth/bap_broadcast_sink). 

[Maria Gilje]

Hello,

Thank you for clarifying.

Maria Gilje said:

I am fairly certain that this is an application limitation, so I will double check this and reply properly when you clarify which sample you are asking about.

It is indeed an application limitation. The hardware limitation is in terms of CPU power, as the incoming streams need to be decoded. Our measurements estimates about 15% CPU load to decode one BIS.

could i changed that bit resolution to 24bit? 

You could. Do note that the LC3 codec acceps 24 bit samples, but truncates them to 16bit.

Best regards,

Maria