A40I android7.1 4路视频同时预览，其中两路模拟AHD输入，两路自带的tvin输入，可以实现同时预览

视频芯片NVP6124B资料(包括芯片手册及hisi驱动程序). NVP6124B include 4-Channels AHD2.0 RX and 9-Channels Audio Codec. It is sure that compatible with AHD1.0. The 4-Channels AHD2.0 RX delivers high quality images. It accepts separate 4 CVBS/COMET/AHD1.0/AHD2.0 inputs from Camera and the other video signal sources. t digitizes and decodes NTSC/PAL/COMET/AHD1.0/AHD2.0 video signal into digital video components which represents 8-bit BT.656/1120(like) 4:2:2 byte interleave format with 27/36/37.125/54/72/74.25/108/144/148.5/297MHz multiplexed.

NVP6124B数据手册 NVP6124B数据手册 NVP6124B数据手册 NVP6124B数据手册

NVP6124B的datasheet,驱动开发必备。如果有相关开发需求，还是挺有用的，比较老的片子了

NVP6124b datasheet 寄存器手册 编程手册NVP6124b datasheet

NEXTCHIP芯片NVP6158 NVP6134 NVP6124B NVP6134C手册，