[Freeswitch-dev] Audio formats without transcoding

I need to support calls using G.711, G.729 and G.722 and I want to avoid transcoding as much as possible. Does FreeSWITCH support playing audios in a raw format that does not require transcoding for any of these codecs? It looks like FS provides WAV audio files with the frequencies of the supported codecs and relies on transcoding all the time. Is my analysis correct? How does everybody else handle this problem? Thanks.