On Thu, Oct 9, 2008 at 9:58 AM, Urja Rannikko <urjaman at gmail.com> wrote: > Hi, > > I'm not sure whether this mail should go to devel or users, but i > think it could be classified as a feature request, so sending to > users. > > I'm just using my old Pentium 233 MMX box to play some 24kbps AAC+ > stream and it takes 69% of CPU to play that, > compared to ~13-15% for 128kbps-320kbps MP3. > (libmp3 seems to have pretty good optimizations, just compare "ls > libfaad2" and "ls mp3lib" in the mplayer source tree?). > > Even if AAC+ is a more advanced coding than MP3, it seems clear to me > that this could be optimized, > i'm just not a decoder expert and wish not to spend lots of time just > to get to know the codebase etc. > > If someone wants to take on this, i could help by testing and maybe > some mmx coding? No point; ffmpeg's built-in aac decoder is already 130% faster than libfaad (and counting). This is mostly due to Loren Merritt's incredibly fast FFT code, but also due to other nice optimizations. It doesn't support HE-AAC yet, but I suspect adding that will be much easier than speeding up libfaad to a respectable level. Dark Shikari
