Fast H.264 Video Decoding by Bit Order Reversing and Its Application to Real-time H.264 Video Encryption
Kang Yi, Yuo-Han Lee, Jeong-Hyun Joo · International Journal of Multimedia and Ubiquitous Engineering · 2016
The demand on fast H.264 video processing technology is highly increasing since the electronics devices with encoding, transmission, and decoding high-resolution video are becoming popular in the consumer market.In this paper, we present a fast H.264 video decoding method by modifying the algorithm dealing with parsing bit-stream of variablelength code (VLC).The key idea of our approach is to reverse the bit order in a fast way through LUT (Look-Up-Table ) in order to reduce the bit pattern extraction time for VLC stream.We demonstrated the speedup by employing the proposed idea for H.264 realtime video encryption application.The experimental results show about 11% execution time reduction in the part of video stream parsing function and 3.1% time reduction in the whole video encryption system.