WFRAC_BITS         24 libavcodec/aarch64/mpegaudiodsp_neon.S #define WFRAC_BITS  16   // fractional bits for window
WFRAC_BITS         53 libavcodec/mpegaudio.h #define WFRAC_BITS  16   /* fractional bits for window */
WFRAC_BITS         34 libavcodec/mpegaudioenc_template.c #define WFRAC_BITS  14   /* fractional bits for window */