similar to: floor0.c and lsp.c optimisations

It seems to me that in this version of the function using float p=.7071067812f; float q=.7071067812f; will just leads after applying all the products and squaring to p and q having a common factor 0.5 which can be extracted from the formulaes. So I propose to replace: float p=.7071067812f; float q=.7071067812f; float w=vorbis_coslook(wdel*k); float *ftmp=lsp; int

Hello I'm working on a fix-point decoder for AOS/Bluebottle - the proprietary OS of ETH Zurich. I've some problems with Floor0-curve-computation: I don't know what the little omega [cos(w)] stands for, line 3 of the official Vorbis documentation. Does anybody knows what this value means? I've tried to get the answer from the jOrbis and Tremor, but both seem to do - among

Do anybody know, from where I can get an Ogg Vorbis File, which uses floor0 coding. I know that the current encoder doesn't use floor0. Anyway, to be fully compliant with the Vorbis Specification the decoder still must be able to decode floor0. I am working on a Vorbis port to a DSP. I want to go sure, that if the need of floor0 decoding will again occur, this also will work properly.

Hello, It seems there is an error in the algorithm for floor0 decode in section 6.2.2 of the Vorbis specification. Here's the relevant part: 3 3) [coefficients] is an empty, zero length vector 4 4) [booknumber] = read an unsigned integer of ilog( [floor0_number_of_books] ) bits 5 5) if ( [booknumber] is greater than the highest number decode codebook ) then

Hi All, I need some clarifications regarding the mismatch I found in the code and the specification. (a) In the specification, the bark(x) equation is given as: bark(x) = 13.1 atan(.00074x) + 2.24 atan(.0000000158(x^2)) + .0001x whereas in the code it is given as: #define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n)) Which one of these is the proper one ? (b)

Here are two optimisations for LSP : in vorbis_lsp_to_lpc, Ae and Ao are filled with zero when i increase so you can reduce the j loop, and I replaced qsort in cacm (maybe there are better algorithms, but it's already much faster than qsort on my mac) void vorbis_lsp_to_lpc(double *lsp,double *lpc,int m){ int i,j,m2=m/2; double *O=alloca(sizeof(double)*m2); double

Well, here you are. 24k; sorry if I'm not supposed to put this size things in your mailbox, didn't know where else to put it. And you all are subscribed to vorbis-dev, after all. I'm not that good at breaking patches apart, so it's one big patch. Sorry. Overview: configure.in make profiling easier & more useful decoder-example.c (#if 0'ed) dither output;

Hi all, The decoder is down 30% execution time, identical bit output. Didn't get the mdct yet; 1024 point mdct is a bit much to brute-force, and I'm not going to hand-unroll the whole thing either (the machine- unrolled version produced a 1.5M executable; understandably, it wasn't very fast. Still waiting for processors with 1.5M L1 code caches ;-) Slowest parts now are: -- mdct --

Hi all, I recently noticed that Vorbis shlibs export several symbols which are not present in it's public header (for a total of 85 symbols, see attach). Would it make sense to filter them via -fvisibility=hidden and -Wl,--version-script? I attached a draft patch. Best regards, Yury Gribov -------------- next part -------------- _book_maptype1_quantvals _book_unquantize __bss_start

Hey guys, I just released my new MacOSX-based OpenAL implementation...part of it is a Ogg Vorbis decoder based on the 1.0 reference libraries. I spent some time optimizing them and found that many of the hotspots in libvorbis are perfect candidates for vectorization, so I wrote Altivec versions of them. The end result? Decoding of a .ogg file is between 30 and 50% faster on a Mac with an

All, Am running asterisk on an Opteron 165 with 4GB RAM and 1x80GB and 1x320GB SATA for a call center application (running VICIDIAL). Asterisk CLI (accessed by screen logging asterisk on startup and entering the allocated screen) gives me 'Warning LSP Low' and the voice quality goes down when this message pops up! That is, to start, we use: `/usr/bin/screen -L -d -m -S asterisk

Jean-Marc, Last week I tried the SVN code (build 11700) on the TI C55x DSP, and found that operation was broken again. I traced this to build 11522, committed on 5 June. The problem is in lsp.c, function lsp_to_lpc(). The line (lsp.c line 461 in build 11700): xin = 1<<(QIMP-1); /* 0.5 in QIMP format */ evaluates to zero. The following change corrects the problem: xin =

(Disclaimer: this is not an LPC vs. LSP question) After looking at the Vorbis code I was wondering why you were using LSP to quantize the spectral envelope instead of simply quantizing the cepstrum (DCT(log(envelope))) or modified cepstrum (DCT(envelope.^alpha)). To me it seems like when the information is already in the frequency domain, there's no need to go back to LPC. Also, I think a DCT

So, it turns out (and another implementation actually explicitly mentions it) that LSP->LPC computation using the FIR algorithm is very sensitive to noise (iterative algorithm) and really really requires doubles [we're not kidding]. This was complicating things for folks pursuing fixed point implementations, and also was a potential source for bugs if FP optimizations got out of hand. This

Hello, everybody. I am looking for same Ogg Vorbis file which have 8192 size frame or using floor0. According to the Ogg Vorbis spec, the maximum frame size is 8192. But I cannot find that size of frame in the Ogg Vorbis file. Also I cannot find Ogg Vorbis file using floor0. If you have, pleas open them. Or can you tell me where I can find them? Sincerely. Eunjik --- >8 ---- List

Hi All, I am planning to implement Ogg Vorbis Decoder on a 24 bit DSP. I have following doubts: 1) What is min and max bitrate? 2)What is max Audio Packet size ? 3)What is the max size of setup header? 4)Any idea how to start for making a 24Bit fixed point reference code? Shall I start with floating point or Tremor or Tremor Low Mem Version? 5) What window sizes in Ogg Vorbis are normally

Hi Group, For the plot below, are there other ways I can use more of the plotting space. I've tweaked the parameters I know of. I could also put the plot titles inside the plot if there is a way to do that. Thanks for your input. Regards, Juliet p1 <- runif(1000) # sample data qp1 <- qqmath(~ -log(p1), data = as.data.frame(p1), distribution =

Hi, it seems to me as if all vorbis-files only contain floors of type 1 and residues of type 2. Is it possible to "force" the encoder to somehow create a vorbis-file with the other floor and residue types? Tor <p><p><p>=================================================================== EASY and FREE access to your email anywhere: http://Mailreader.com/

Is there a archive with a collection of different .ogg files encoded with different settings that can be used to verify compatibility? * Different window size (e.g. != 256,2048) * Much larger codebooks and other extreme cases that are not generated using a standard encoder. * floor0 Regards -- / Johannes Sandvall --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project

Hi, Am trying to run beta4 encoder on a Sun machine. Want to compare floor0 and floor1. Do not have autoconf and automake. Got the encoder to compile with a simple makefile. The only define i am using is NO_FLOAT_MATH_LIB. The encoded file when played(winamp) gives out plain noise. Am i missing any other flags/defs? -Cathy <p>--------------------------------- Do you Yahoo!? Yahoo!