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视频解码器自动读取PES缓冲区中的视频数据,按照MPEG压缩编码格式,首先将视频位流分解成8×8数据块和运动矢量,再处理成16×16的宏块并逐一进行解码,然后将其宏块解码数据进行样品重建。最后再由嵌入式微控制器操作DRAM接口的控制线,将其重建样品数据再次从DRAM接口存入U32分配的解码图像亮度数据缓冲区、色度数据缓冲区,以备视频处理单元用。
The video decoder automatically reads the video data in the PES buffer. According to the MPEG compression encoding format, the video bit stream is first decomposed into 8 × 8 data blocks and motion vectors, and then processed into 16 × 16 macroblocks and decoded one by one. Then the macroblock decoded data for sample reconstruction. Finally, by the embedded microcontroller operating DRAM interface control line, the reconstruction of the sample data again from the DRAM interface into U32 assigned decoded image brightness data buffer, chroma data buffer for video processing unit.