I've recently found that the Lenovo K4 Note features a Wolfson WM8281 DSP, and the codec supports 24-bit and 192 kHz output. I use Poweramp alpha player and I enabled Hi-Res Output (Lenovo Hi-Fi variant), but I found out Lenovo didn't implement 24-bit audio decoding, only 16-bit output. Basically, it has the hardware to output 24-bit, but it's disabled at software level on stock ROM. I checked audio_policy.conf in /etc folder to confirm, and indeed there is no single mention of 24-bit ouput whatsoever. Is it possible to implement 24-bit audio decoding and output with a custom ROM? Or the necessary drivers weren't released by Lenovo or MediaTek?
