On Tue, Feb 11, 2014 at 08:52:12AM +0100, Niels Möller wrote: > Hi, > > I intend to add support for the xll extension to the dca decoder, aka > "DTS-HD Master Audio", as requested on > https://wiki.videolan.org/Bounties#List_of_bounties. I work at Southpole > Consulting, together with Benjamin Larsson, and I'll hopefully be able > to spend a couple of weeks of working time on this.
Nice. > There are two parts of this project. First, implement the parsing and > processing of the xll extension data. Second, reverse engineer whatever > details of the fixed point decoding operations are needed to actually > get bit exact lossless result, and implement them in libav. [...] > > Outside of work, I'm involved in the GNU Nettle crypto library, > and the GNU GMP bignum library. I'm new to libav. You can safely guess that XLL requires working with 64-bit math so not completely unfamiliar to you. For the reverse engineering you can probably take any binary decoder out there, I heard they are all based on the reference code from DTS and thus should be similar inside. And IIRC Ben was able to locate fixedpoint QMF routine in some decoder too. _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
