DSF (".dsf" name of file extension) is lossless audio file format contained 1-bit audio stream (audio data) under delta sigma modulation. The format of audio data used in modern audiophile 1-bit DSD DACs.
HD audio converter for DSF file format AuI ConverteR 48x44
(input DSF/DFF/ISO supported in Audiophil-E,
full DSF support in version PROduce-RD)
adjust sample rate and gain DSF
Supported sample rates:
2.8 MHz (CD sample rate 44100 Hz x 64, DSD64, D64),
5.6 MHz (DSD128, D128),
11.2 MHz (DSD256, D256),
22.5 MHz (DSD512, D512).
DSF format support multichannel configuration.
DSF audio files stores metadata (song name, artist name, artwork, etc.).
Alternative format is DFF audio file. In current ttime it don't support metatags.
How open DSF with audio players described here.
DSF and DFF files can playback with software as directly at 1-bit DSD DAC or with real-time conversion ("inline") at PCM DAC.
Conversion DSF to PCM and PCM to DSF applied with quality loss.
As rule, non-real-time conversion (via audio file converter) is not restricted by real-time performance of software / hardware and there possible applying more exact digital signal processing.
How convert DFF to DSF under Mac OS X, Windows, Linux read here.