NONE               54 libavfilter/af_afade.c enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, LOSI, NONE, NB_CURVES };
NONE               87 libavfilter/af_biquads.c     NONE,
NONE               46 libavfilter/af_loudnorm.c     NONE,
NONE               26 libavfilter/dnn/dnn_backend_native_layer_conv2d.h typedef enum {RELU, TANH, SIGMOID, NONE, LEAKY_RELU} DNNActivationFunc;