DSD (Direct Stream Digital) is a digital format that stores audio as a sequence of single-bit values at a very high sampling rate.
Native DSD playback. Requires ALSA 220.127.116.11 or later, a sound driver/chip that supports DSD and of course a DAC that supports DSD.
DoP (DSD over PCM) playback. This wraps DSD inside fake 24 bit PCM according to the DoP standard. Requires a DAC that supports DSD. No support from ALSA and the sound chip required (except for bit-perfect 24 bit PCM support).
Convert DSD to PCM on-the-fly.
Native DSD playback is used automatically if available. DoP
is only used if enabled explicitly using the
because there is no way for MPD to
find out whether the DAC supports it. DSD to PCM conversion
is the fallback if DSD cannot be used directly.