similar to: encoding to fixed window length vorbis file

I administer a nano-setup on a dorm-network with a couple of hundred active users. The setup uses 2 x 2 2Mb/s DSLs, meaning two DSLs from each of two different ISPs. It works fine except for some minor glitches: https-sites often kicks users. This was solved by tying outbound https to a single DSL. Not the best solution but it works so far that users dont kicked from the sites anymore. Now

Hi, Is there anything special I need to know about VP3's IDCT? I mean besides the fact that there are separate IDCTs to handle sparse coefficient matrices. Are the IDCT functions mathematically equivalent to any textbook IDCT functions? Thanks... -- -Mike Melanson --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To

Sorry for starting another topic, this is actually a reply to Segher's post on Sun Oct 22 on the 'mdct question' topic. I wasn't subscribed properly and so I didn't get email confirmation and thus can't add to that thread. So Segher, if the equation is indeed what you say it is, then replacing mdct_backward with this version should work, but it doesn't. Am I applying

Hello all, I have recently ported Vorbis to a Texas instruments DSP (TMS320C5510), The problem I have is that it is not decoding the audio in real time( about 50% of real time). Could any one give me a clue in which area I could start to optimize the code. Regards Kevin <p><p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage:

I wrote to the list earlier about optimizations of the tremor. Specially replacing the IMDCT with a N/4 FFT. The report is available here: http://www.sandvall.nu/thesis.pdf Short summary: Optimization of the Tremor code under 50kB for a "split" decoder version. ~44 MIPS. Huffman highly unoptimized. IMDCT ~ 8 MIPS. Quick overview of the

Hello everyone, the code is slowly getting a little bit messy, but at least I've managed to tweak a lot of performance out of my Vorbis player for Flash. I did several improvements to the Huffman decoder by eliminating function calls and managed after a while to create an AS/haXe hybrid player. The haXe compiler definately produces much more efficient bytecode (at least in some

Hi On http://www.xiph.org/ogg/vorbis/doc/vorbis-spec-intro.html there is a link to a document titled 'The use of multirate filter banks for coding of high quality digital audio' that explains window functions for iMDCT. I would very much like to read that document, but the link is broken. If someone would send me the document or a working link to it, I would be very happy. Thanks in

Hello !! While reading I am facing lot of problems . Doing reserve enginnering without any document is really putting in trouble . ( that is not the case in ac3 , mp3 ) . The problems are ----> 1. How physcoacoustic model is generated . I was reading noise masking . I have understood that FFT of 2048 samples is used for finding tone masking . And MDCT of same samples is used for

Hi, I'm currently working on a paper describing Ogg Vorbis. It is not finished yet. Mostly the decoder is being described. If you have any comments, please send them to me. See: http://www.turbocat.net/~hselasky/math/vorbis/files/ Then I have a question about the function "bark_noise_hybridmp()" which is used in the encoder. Can someone describe what the function does in

The applications now work again, after updating the following packages to version 20120127: app-emulation/emul-linux-x86-baselibs-20110928 app-emulation/emul-linux-x86-xlibs-20110928 app-emulation/emul-linux-x86-medialibs-20110928 app-emulation/emul-linux-x86-soundlibs-20110928 app-emulation/emul-linux-x86-sdl-20110928I think I had tinkered with them before, though, as one of the application's

Hi All, Currently I am investigating how interesting OGG is for me. The most important requirements are: - Decoding on embedded hardware, ARM7 or ARM9. - Mixing multiple audio streams/files on embedded hardware First of all how difficult is it to decode OGG on an ARM7/9 processor? I read that OGG decoding needs floating point support? Secondly I would like to know how many MIPS are needed to

libvorbis does not currently have any simd/vectorization. Following patches add generic framework for simd/vectorization and on top, add ARM-NEON simd vectorization using intrinsics. I was able to get over 34% performance improvement on my Beaglebone Black which is single Cortex-A8 based CPU. You can find more information on metrics and procedure I used to measure at

Hi I've got serious problem with my Vorbis-Decoder. The error seems to happen in the inverse Mdct. Before the imdct the values seems to be correct (compared with those of jOrbis (www.jcraft.com/jorbis/)). But after the transformation the values shows a strange behaviour. In [0, blocksize/2] the values are correct, but in [blocksize/2, blocksize] the values are wrong. The difference in

Hi !! <p> I am just now reading Vorbis I specifications . I ahve some quries in that regading overlap add and sqaure polar mapping . I am writting this mail with the hope that ,some one will resolve my quries. <p> 1. After IMDCT , to remove the aliasing , we do overlap and add . For that the window should have following properties -------------> hk =

Guys I'm making this post because the wine tests details section get truncated but most of it was for Sabayon users: ---- -What Works- PvE, PvP, menu's etc... I was getting pretty good frames too depending on where and what I was doing between 30-90FPS I would say average PvE around 70FPS and in cities with PvP between 30-60FPS. What Doesn't Work 64-bit client (going to work on

Hi everybody, after hearing about the new Sound functionality in Flash 10, Arek's performance gain using the new Vector type instead of Array and not at least actually seeing the performance boost he achieved compared to my old Vorbis decoder, I found a few hours yesterday to migrate my old code. First of all: the new PCM playback API for Flash is rather restricted and only allows 44.1

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#ffffff" text="#000000"> Hi,<br> <br> I have been looking into optimising the CELT decoder for speed to make it acceptable for

Hi. When can we expect the next beta version of Vorbis encoder (with some tagging & encoding options I hope)? Also, today I tested MPEG+ encoder which you can download from http://www.stud.uni-hannover.de/user/73884/mppenc.zip (win encoder) http://www.stud.uni-hannover.de/user/73884/in_mpp.zip (winamp plug-in) http://www.stud.uni-hannover.de/user/73884/mppdec.zip (win decoder) It sounds

Can anybody point me at any resources that would explain how to optimize mdct_backward for a cpu with a fused multiply-accumute unit? >From what I understand from responses to my older postings, Tremor's mdct_backward could be rewritten to take advantage of a muladd. My target machine can do either two-wide 32x32 + Accum(64) -> Accum(64) integer muladd or eight-wide 16x16 + Accum(32)

Hi all, I'm attempting to convert all the pointers to arrays the mdct_backward function so it can be partitioned off for a hardware implementation. Although this code is quite short I'm finding it a little tricky. As it stands, mdct_backward is passed values by reference i.e. void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out) o my modified version starts void