Embedded Real-Time MPEG-4 Decoder Based on ADSP-BF527

Abstract

In this paper, we propose an embedded real-time MPEG-4 decoder based on ADSP-BF527 Blackfin DSP. In order to achieve the real-time requirement of MPEG-4 decoding, we modify and optimize the decoding modules. Firstly, we analyze the number of operations for various modules, and then use two buffer groups (BG) as parallel decoding mechanism of broadcast transformation. Finally, we make use of direct memory access (DMA) to carry out program steps. Experimental results demonstrate that the proposed method can decode a CIF video which reduces approximately 40.3 MHz core cycles. In addition, the decoded frame playing rate can increase from 3 fps to 25 fps when applied the PPI procedure. The playing rate can reach above 30 fps as using QCIF video so that the proposed method can achieve a real-time decoder and player.