search for: floor1

Hello, I was printing some Floor1 X values from a test audio file, and the values that I've obtained look mostly like the following: [23,33,46,65,79,93,111,130,158,186,220,260,312,372,464,556,750,1024] => For long blocks [8,16,33,70,128] => For short blocks Obviously they are not in Hz, so, could someone please tell me...

Hello, I have two questions concerning floor1 encoding/decoding. First I'll ask about the FLOOR1_fromdB_LOOKUP table: what is it's purpose? Is it to convert the amplitude differences between [floor1_Y] values to a dB scale? And, if I'm right with that, here comes the 2nd question: when render_line0 is used to encode floor1, then fl...

Hi, is there an error in the last part of the algorithm describing how to read a floor1 header? According to point 18 and 19, the vector [floor1_class_dimensions] must have at least [floor1_partitions] elements, but when reading/computing these two values on the beginning of the header, they are not related to eachother, and my attempts to apply this algorithm to real ogg-files gi...

Hello, There is a bug in the current version of vorbis/lib/floor1.c. The line that says:- qsort(sortpointer,n,sizeof(int),icomp); should be:- qsort(sortpointer,n,sizeof(int *),icomp); But somebody probably fixed that already. :) Also, I'd like to know how I can encode a file using the channel coupling modes. oggenc doesn't have an option...

Hello, I've read in a thread from this mailing list ( http://lists.xiph.org/pipermail/vorbis-dev/2009-September/020019.html) that the usage of FLOOR1_fromdB_LOOKUP table is to convert Floor1 values from a dB scale to a linear scale. In a dB scale, given a reference value, the other dB values are obtained from it, normally dB_value = 10log(p1/p0), where p0 is the reference value. Supposing p0 is a fixed value, both 10log(p1/p0) => p1/p0 and 10...

Hi, We are two students doing project with Vorbis audio compression for our B.Sc studies. We have two questions: Our first question related to the floor1 inverse dB lookup table. As we understood the floor values encoded as offset integers (Y) from 1 to 256 and then used as index in the floor1_inverse_dB_table to get an encoded value. This value (denoted as X) is inverse of linear frequency so 20*log10(1/X) is dB value. In the basic case if Y is 256...

Hello, I've been "playing" a little with the floor1 encoding, and my game has posed me a question. I've been modifying (just curiosity) manually, and randomly (not too great modifications), the quantized [floor1_Y] values, just before coding them with the codebooks. As, if I'm not wrong, the [floor1_Y] obtained are then removed to get the re...

Hello, You know, I always worry about the precision and the float constants... and there is a large lookup table in the floor1.c ... and I figure out a way to keep the code size and speed, but to improve the precision at this lookup table. (the difference is small, but audible) Here is the modifications in the floor1.c: tatic unsigned long FLOOR_fromdB_LOOKUP[256]={ 0x33E4B434,0x33F390FF,0x3401B286, 0x340A2036,0x34131A1E...

Hi everyone, after having an extensive look at the reference decoder as well as the specification documents, I'd like to point out what I think to be some minor omissions/flaws in the latter, and suggestions for correcting them. --- #1: in vorbis-spec-floor1.html, packet decode: Between 14) and 15) a crucial step is missing. Please insert: 14a) [cval] >>= [cbits] ---- #2: in vorbis-spec-floor1.html, curve computation step #1: The distinction between [floor1_Y] and [floor1_final_Y] looks invalid. IIRC the prediction loop works as follows: At t...

...double y = floor(x); double y_ = floor_(x); } If I compile this for Mips16, it calls the proper helper function for floor_ but not for floor, because the signature for floor in callee info is wrong. Args[0] = void RetTy = void /local/llvmpb_config/install/bin/clang -target mipsel-linux-gnu floor1.c -o floor1.s -mips16 -S -fPIC ..... lw $3, %got(x)($2) lw $4, 0($3) lw $5, 4($3) lw $6, %call16(floor)($2) move $25, $6 move $gp, $2 sw $2, 20 ( $16 ); sw $3, 16 ( $16 ); jalrc $6 sw $3, 36($16) sw $2, 32($16) lw $2, 16 ( $16 ); lw $5, 4($2) lw $4, 0($2) lw $3, 20 ( $16 ); lw $2...

I'm getting some problems because it seems that the compiler is treating "floor" differently from other math library functions like "sin". The Args and RetVal have the parameter and return types marked as void. For mips16, it's important that I be able to know the original signature for floating point functions. In some cases, need to create calls to helper

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...

...use the greater precision of double throughout. Otherwise, for information, I have been looking into the differences between the output of Tremor and the output of the Vorbis floating point decoder reported in the following post: http://www.mail-archive.com/tremor at xiph.org/msg00072.html Where floor1 is used the RMS differences are already small: about 0.7 However with a couple of trivial modifications I have been able to reduce the RMS differences to about 0.1 The big problem is that where floor0 is used the RMS differences are *enormous*. I have investigated these and they are: a) partly due...

Hi According to vorbis I spec, there are several configurations. There are 2 formats of floor, 3 formats of residue and 3 look up types of VQ codebook, etc. I think to get all kinds of vorbis file with these configurations but what I have got from network only support some of the formats (Ex. floor1, residue 1 & 2, VQ lookup type0 & 1). I downloaded several freeware vorbis encoder but they all support only quality, bit-rate or other user-level setting without the detail spec. setting. I checked the vorbis released encoder source-code, it also provides some kinds of templete, not al...

Hi, Lately, my oggenc builds (from CVS) haven't been running correctly. In a few debugging sessions, I've found that I'm getting a divide by zero exception. The exception happens in accumulate_fit (floor1.c), line 455: int weight=nb*info->twofitweight/na; Here is the call stack: accumulate_fit floot1_fit mapping0_forward vorbis_analysis oe_encode main The error happens very early: the first call to vorbis_analysis (third iter. through the main encode loop) in oe_encode. Rep...

Mandag, 2 juni 2003, skrev du: >On Mon, 02 Jun 2003 21:22, Vitaly Nechyos wrote: >This is what people usually want when they say 'normalization'. AFAIK, you >can't easily tinker with the vorbis frames to add a scale factor in the same >way you can with MP3, but I could be wrong. I could be wrong too, but if I haven't overseen anything, it should be possible to

Hi! While implementing a Vorbis I decoder, I have found a few errors in the specification. After making the following changes everything works as advertised, thank you! Errata: 1.) In section 7.2.2 Floor1 header decode (on a side not wouldn't 7.2.2.1 be the logical number here, looking at the overall structure of the document?), step 21 element element ([j] + [floor1_values]) should insted be element [floor1_values] 2.) In section 7.2.2.2.1, step 15 [room] is mispelled as [root] 3.) In sec...

...e, please? <p>Best Thanks Daniel Here the message output from compiling. ----------------------------------------- /usr/ccs/bin/ld -G -z defs -h libvorbis.so.0 -o .libs/libvorbis.so.0.3.0 mdct.lo smallft.lo block.lo envelope.lo window.lo lsp.lo lpc.lo analysis.lo synthesis.lo psy.lo info.lo floor1.lo floor0.lo res0.lo mapping0.lo registry.lo codebook.lo sharedbook.lo lookup.lo bitrate.lo -R/usr/local/lib -R/usr/local/lib -lm /usr/local/lib/libogg.so -lc Undefined first referenced symbol in file __ashrdi3 block.lo...

VorbisHi Any help is appreciate. I have two questions. First, I looked into the vorbis-?-specific and was confused by the floor1 algorithm. I think at last the aim is to derive the piecewise curve with the list X and Y,then when encodering ,why not use the selected point orderly to get the curve ? In other words, the specific use the list of [0,128,64,32,96,16,48,80] , why can not use [0,16,32,48,64,80,96,112,128] and enco...

Hi` I just subscribed to the list and already have a couple of questions ;) I read the FAQ and skimmed through the archives but I'd rather get up- to date information and not rely on what I read in old posts. Are there any games/ mods using Ogg Vorbis? Are there any other tools despite standalone music players using Ogg Vorbis? How fast is decompression? How big is the memory overhead for