A Real-Time H.264 BP Decoder Based on ADSP-BF548

Abstract

In this paper, we propose an embedded real-time H.264 Baseline Profile (BP) decoder based on ADSP-BF548 Blackfin processor. In order to achieve the real-time requirement of H.264 decoding, we modify and optimize the decoding modules and codes, respectively. Firstly, we analyze the number of operations for various modules using assembly code, and then use direct memory access (DMA) to carry out the parallelism between algorithm execution and data movement. Finally, we make use of two buffer groups (BG) as parallel decoding mechanism of broadcast transformation. Experimental results demonstrate that the play rate can reach above 25 fps as using QCIF video. According to some tests, a real-time H.264 BP decoding can be achieved with a 600 MHz DSP.