IMX6 audio capture 24 bit

Technical Support
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1

Hello,

I am trying to capture audio via line in with the following sample format: S24_LE (24 bit little endian). However, the resulting recordings are mute.

I am using the following command to record: arecord --device=hw:0,0,0 -q -r 48000 -f S24_LE -c 1 -t wav -d 60 “recording.wav”

If i use 16 bits, as in S16_LE it works. However i thought i read on the datasheet that imx6 audio codec supports 24bits? Or am i wrong about this?

Thank you

2

Hi @bpadovese

Could you provide the software version of your module?
Did you get any errors when you launched the command?

Best regards,
Jaski

3

You are correct, there is an error message saying:

arecord: set_params:1297: Sample format non available
Available formats:

  • S16_LE

I was running the command with a script which is why i didn’t see the error before. But again, I thought 24 bits were supported? could you confirm if it is only 16 bits supported by the audio codec?

I think im running linux version 2.7 but im not sure. How can i check?

4

I was running the command with a script which is why i didn’t see the error before. But again, I thought 24 bits were supported? could you confirm if it is only 16 bits supported by the audio codec?

You can check this with the following command:
arecord --dump-hw-params | grep FORMAT

I think im running linux version 2.7 but im not sure. How can i check?

You can check it by typing the following command in Linux : uname -a. Please update to the stable Bsp 2.8.