func getLayerFilter(fh *mp3agic.FrameHeader) uint32 { if fh.Verify() != nil { return 0 } switch fh.Layer() { case mp3agic.MPEG_LAYER_1: return FILTER_LAYER1 case mp3agic.MPEG_LAYER_2: return FILTER_LAYER2 case mp3agic.MPEG_LAYER_3: return FILTER_LAYER3 } return 0 }