UAC_DT_AC_HEADER_LENGTH   66 drivers/usb/gadget/function/f_uac1.c #define UAC_DT_AC_HEADER_LENGTH	UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
UAC_DT_AC_HEADER_LENGTH   48 drivers/usb/gadget/function/f_uac1_legacy.c #define UAC_DT_AC_HEADER_LENGTH	UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)