Format atom ('frma') An atom that shows the data format of the stored sound media. Mentioned inSound sample data TopicsData fieldsSizeTypeData format See AlsoExtending sound sample descriptionssiSlopeAndIntercept atomsiDecompressionParam atom ('wave')Terminator atom ('0x00000000')MPEG-4 elementary stream descriptor atom ('esds')Audio channel layout atom ('chan')Subtitle follows track reference atom ('folw')