[alsa-devel] ALSA Overlay 24bit data 32bit slots

[Clemens Ladisch]

Ed McNicholas wrote:
> I am interfacing with a dsp that we have programmed and there are only
> options for slot widths of 16 or 32 bits but we are using a 24 bit
> data format.

24-bit samples are typically handled by padding them to 32 bits and then
pretending they are 32 bits.

> When I record using
>
> arecord -v -f S24_LE -r 48000 -t wav -c4 /home/nyquist/test.wav
>
> I get garbage

S24_LE is a very unusual format (24 bits padded to 32 bit with a zero
byte as the most significant byte), and not supported by the .wav file
format.  Try a raw file instead.  And the normal format for 24-bit
samples would be S32_LE.


Regards,
Clemens