Is there support for ADPCM (a.k.a. G723) in Java Sound?
Currently not. There is an alpha version of a codec for IMA ADPCM in Tritonus. However, the file readers and writers haven’t been adapted to handle this format, so the codec is of little use. Doing this is not really difficult, volunteers are appreciated. Developing support for MS ADPCM shouldn’t be too difficult, too. Also note that JMF can handle IMA ADPCM.