Streaming audio via nrf9151

[Yesman2024]

Hi

Is it possible to stream 128 kbps .acc, .lc3 or .mp3 Spotify audio from server to nrf9151 ?

It says it supports 300 kbps download, so maybe 150 kbps is realistic ?

With minimal overhead we need ca 135 kpbs. I know some developers that says it uses minutes to download a new firmware of 300kB t the nrf9151.

Tnx, Tomas.

[Michal]

Hello Tomas,

You should test the speed yourself with the iperf3 function in the modem shell sample.

This older case can also be relevant:  nRF9160 DK maximum throughput

But beware that the data on LTE-M networks can be quite costly per MB, if you're going to stream audio.

Also, I don't think that spotify has any user-friendly APIs for downloading the audio data from their servers.

Best regards,

Michal

[Yesman2024]

Thanks! Yes, the Spotify Web API streams audio in either 128 kbps AAC or 256 kbps formats. To make this work for our use case, we are aiming to establish a special agreement with Spotify that allows us to access the stream and transcode it to 128 kbps LC3. The plan is to then forward the LC3-encoded stream to the nRF9151, which will transmit it to the nRF5340. From there, the audio will be sent to earbuds that support LE Audio.

[Michal]

From what I can see Spotify is quite strict with any access to audio, so I would personally recommend making sure that you are able to get permission from them first, if using any other platform is not an option.

Best regards,

Michal

[Yesman2024]

Yes, if they not allow it, we need to transmit 128 kbps .aac codec strem to nrf 9151 then to nrf5340 then nrf5340 needs to translate it into 128 kbps .lcr codec