how to config the open-source lc3 codec for nrf5340

[Zhongsan]

Hi

we got three nrf5340 audio dk, because we are still waiting for LC3 code authorization， so, I wonder how to config the sample project nrf5340_audio to use the open-source lc3 codec(liblc3codec)

thanks

[dejans]

Hi,

LC3 codec configuration options are already included in the overlay files overlay-headset.conf and overlay-gateway.conf (CONFIG_LC3_ENC_CHAN_MAX=2 and CONFIG_LC3_DEC_CHAN_MAX=1).
You can read more about nRF53 audio in the documentation.

Best regards,
Dejan

[Zhongsan]

Hi

Yes, I know nRF5340 audio already included the config of LC3 codec, but that one need authorize, we still waiting, I want to use the open-source one

thanks

[dejans]

Hi,

You can use SBC codec instead of LC3. There are several changes that you need to make in prj.conf and overlay files.
You need to remove following two lines from the overlay files overlay-headset.conf and overlay-gateway.conf.
CONFIG_LC3_ENC_CHAN_MAX=2
CONFIG_LC3_DEC_CHAN_MAX=1
and add line CONFIG_SW_CODEC_SBC=y to the prj.conf

Best regards,
Dejan

[Zhongsan]

Hi

Do you mean that the open source lc3 codec cannot be used for this project

thanks

[dejans]

Hi,

LC3 codec is not open source, It requires that you obtain license to access the repository.
In other words, you can use either SBC software codec, or LC3 codec which requires license.

Best regards,
Dejan