16bit seems to be upscaled to 24bit

[TheOldPresbyope]

@iambrian

Out of idle curiosity, what does alsacap report for these two DACs?

E.g., for a moOde player I have at hand with a first-gen USB Khadas Tone Board attached:

Code:

pi@CM4:~ $ alsacap
*** Scanning for playback devices ***
Card 0, ID `b1', name `bcm2835 HDMI 1'
 Device 0, ID `bcm2835 HDMI 1', name `bcm2835 HDMI 1', 8 subdevices (7 available)
   1..8 channels, sampling rate 8000..192000 Hz
   Sample formats: U8, S16_LE
   Buffer size range from 80 to 131072
   Period size range from 80 to 131072

     Subdevice 0, name `subdevice #0'
     Subdevice 1, name `subdevice #1'
     Subdevice 2, name `subdevice #2'
     Subdevice 3, name `subdevice #3'
     Subdevice 4, name `subdevice #4'
     Subdevice 5, name `subdevice #5'
     Subdevice 6, name `subdevice #6'
     Subdevice 7, name `subdevice #7'
Card 1, ID `Tone1', name `Tone1'
 Device 0, ID `USB Audio', name `USB Audio', 1 subdevices (1 available)
   2 channels, sampling rate 44100..768000 Hz
   Sample formats: S32_LE, SPECIAL, DSD_U32_BE
   Buffer size range from 16 to 131072
   Period size range from 8 to 65536

     Subdevice 0, name `subdevice #0'

While, for another with a Creative Tech USB-Bluetooth audio adapter, I get

Code:

...
Card 2, ID `W2', name `Creative Bluetooth Audio W2'
 Device 0, ID `USB Audio', name `USB Audio', 1 subdevices (1 available)
   2 channels, sampling rate 48000..48000 Hz
   Sample formats: S16_LE
   Buffer size range from 96 to 262144
   Period size range from 48 to 131072

     Subdevice 0, name `subdevice #0'

[Sorry, I've got a HiFiBerry DAC stashed away in one crate or another but I'm too lazy to search for it this morning.]

Regards,
Kent