The library is used in VLC media player and is able to decode DTS audio tracks from DVDs. It can also decode DTS files (.dts) directly, as well as DTS-WAV files (.wav). libdca is able to decode DTS-ES streams as well, however can only decode the standard 6 channels as the additional "Extended Surround" extensions (for Matrix and 6.1 Discrete) require ES Extensions to the codec.
libdca comes packaged with a small proof of concept decoder dcadec (formerly dtsdec). This program is able to decode DTS audio streams into stereoWAV or into a single multichannel WAV, as well as being able to be played back through the sound card.