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aplay -D hw:imxaudioxcvr -c 2 -r 48000 -f S32_LE /dev/urandom 
Playing raw data '/dev/urandom' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo
aplay: set_params:1387: Sample format non available
Available formats:
- IEC958_SUBFRAME_LE