Winstein and Horowitz' code was capable of supporting realtime decode and playback, but we're told the output was occasionally jerky. This makes it pretty insignificant compared to the rest of the decoding process" = in other words, it's quick enough not to impede the MPEG 2 decode operation which turns the data into a moving image.Īpparently, the latter may be a problem with qrpff, the Perl CSS descrambler written by Keith Winstein and Marc Horowitz, and posted on Carnegie Mellon University professor David Touretzky's DSS Descrambler Gallery Web site. the 10500 bps link is part of Inmarsats Aero H and H+. The 6 bps links are part of Inmarsats Classic Aero service which is due to be discontinued in 2018. The links use OBPSK or OQPSK modulated with 600, 1200, and 10500 bps signals. The speed comes "without even particularly trying to optimise the I/O. Inmarsat Aero in this article is the Forward TDM link from ground station to plane. The programmer claims it can "descramble in excess of 21.5MBps" - faster than the DVD spec. Hannum's C program, called efdtt, is no slouch, either. Coder Charles M Hannum has created the smallest program capable of decoding a Content Scrambling System (CSS) DVD file, beating last week's seven-line Perl shell script 442 bytes to 472 (excluding newline bytes).
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