In order to explain the video-capture interface I will use the example of a camera that has no tuners or audio input.
为了更好的解释视频采集接口，我采用了一个没有接收机和没有音频输入的摄像头作例子。
Considering that there is no valid data in the vertical blanking intervals of the video signal, bulk transfer with one field as a unit is used in the input channel.
针对视频图像场消隐期间无有效数据的特点，输入通道中外设以场为单位分块传输实时泄漏截获数据至主机。
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