High-performance software MPEG video player for PCs

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Abstract
This presentation describes the implementation of the video part of a high performance software MPEG player for PCs, capable of decoding both video and audio in real-time on a 90 MHz Pentium system. The basic program design concepts, the methods to achieve high performance, the quality versus speed trade-offs employed by the program, and performance figures, showing the contribution of the different decoding steps to the total computational effort, are presented. Several decoding stages work on up to four data words in parallel by splitting the 32 bit ALU into four virtual 8 bit ALUs. Care had to be taken to avoid arithmetic overflow in these stages. The 8 X 8 inverse DCT is based on a table driven symmetric forward-mapped algorithm which splits the IDCT into four 4 X 4 DCTs. In addition, the IDCT has been combined with the inverse quantization into a single computational step. The display process uses a fast 4 X 4 ordered dither algorithm in YUV space to quantize the 24 bit 4:2:0 YUV output of the decoder to the 8 bit color lookup table hardware of the PC.

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