nRF5340 Audio DK Application Codecs

RE: nRF5340 Audio DK Application Codecs

user116847 — Wed, 15 Jun 2022 08:05:09 GMT

Thank you for your help Amanda.

RE: nRF5340 Audio DK Application Codecs

user77782 — Wed, 15 Jun 2022 07:24:56 GMT

Hi,

Are you using CIS or BIS?

We haven't tested if 240 bytes per packet will run properly on CIS or BIS without codec, but you can try.

You can modify the encode/decode function here for bypassing LC3/SBC

https://github.com/nrfconnect/sdk-nrf/blob/main/applications/nrf5340_audio/src/audio/sw_codec_select.c#L57

-Amanda

RE: nRF5340 Audio DK Application Codecs

user116847 — Tue, 14 Jun 2022 13:58:33 GMT

What if i have 240byte of audio frame for per frame without codec ? Because of this case, i do not want to use any of the codecs. So, what is the ways of disabling all the codecs.

ps: it is mandatory that ble audio mode.

RE: nRF5340 Audio DK Application Codecs

user77782 — Tue, 14 Jun 2022 12:57:08 GMT

Hi,

[quote user=""]is it possible that disabling all the codecs ?[/quote]

Disabling all codecs, means we are going to transmit "raw audio frame" without any compression. That would need huge bandwidth. For now, we are using 48KSpS, 10ms audio frame, and 16 bits depth per channel in the default setting. That means the raw data per channel and per frame is 960 bytes. And this is something we cannot send in one packet. With LC3, the encoded data is 120 bytes (only 1/8) But if you just would like to see dummy data, then it should need some works because now the decoded data frame is tied with the audio synchronization feature closely.

[quote user=""]can we use some custom codec ?[/quote]

Yes, sw_codec_select.c is the middle layer in which you can replace the codec by yourself.

Regards,
Amanda