search for: huffman

There is bit space in Bitstream Header to put Huffman codes in. However, This space can take only 80 kinds of Huffman code set. And This space is divded into DC Huffman code set and AC Huffman set, and There are only 16 choices in each DC and AC Huffman code set. If we want to use this space, we find out best(or proper) performance 80 frequency count...

...only I-frames). I don't undestand one moment. Now i develop such stages: 1. From RBG(byer) to YCbCr converter 2. DCT processing (8x8 pixels blocks) 3. Quantizator of DCT coeff. 4. Zig-Zag of quantized DCT coeff. and now i have uresolved last stage of compression - how i must send 8x8 blocks to huffman compressor? I don't understand ordering. I must send all DC coeff (Y, than Cb,Cr), after all AC-0 (Y, than Cb,Cr) .... after all AC-63 (Y, than Cb,Cr)? And put huffman compression result to buffer memory like this: huffman compression products of all DC coeff (Y, than Cb,Cr), after all AC-0 (Y,...

...; 3) zig-zag in eatch 8*8 block from previous step and push it to bufer > memory. > > > > i push 16X16 blocks to BLOCK1 using raster order (i'm right?) > > Now i'm confused - so much types of ordering. What i must do after DCT? > > What is order for pass blocks to Huffman block? > > In Theora terminology, a 16x16 unit spanning all 3 color planes (8x8 in U > and V) is called a "macroblock". To encode the contents of a macroblock, > you must separate out the different color planes, and form "superblocks" > in each color plane. The...

Hi, all I am studying the ogg-vorbis algorithm but I have less knowledge about the codebook structure of vorbis. After tracing the release source code, I found it doesn't use huffman tree to decode the huffman code instead of using a special mapping and pre-look. The memory requirement seems similar with huffman tree decoding. Could anyone tell me how the vorbis huffman decoding works and the difference or advantage. Or where can I get the information. Thanks... trimp ___...

...> >> About two months ago I posted a patch that hoisted the hottest case >> >> statement from a switch statement during ISelLowering. >> >> >> >> See: http://reviews.llvm.org/D5786 >> >> >> >> Sean was rather adamant about using a Huffman tree (and I agree this >> is >> >> a >> >> more complete solution), so I'd like to put a patch together. >> > >> > I think this sounds really cool! >> > >> >> That being >> >> said, I have a few questions. >>...

...r at codeaurora.org> > wrote: >> All, >> About two months ago I posted a patch that hoisted the hottest case >> statement from a switch statement during ISelLowering. >> >> See: http://reviews.llvm.org/D5786 >> >> Sean was rather adamant about using a Huffman tree (and I agree this is >> a >> more complete solution), so I'd like to put a patch together. > > I think this sounds really cool! > >> That being >> said, I have a few questions. >> >> The current switch lowering code sorts based on case values an...

...oth with my custom application and with Typo. In my app I tried url_for :only_path => true which didn''t seem to help, and I''m not enamored with doing this in Typo and then re-doing it if I ever upgrade, is there a way to "hide" the port number from rails? -- Jeremy Huffman http://www.jeremyhuffman.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060321/db68b9b7/attachment.html

Hello all, I've been working a little inside the Theora decoder when I found that it seems that many videos had the very same huffman tables encoded into their bitstreams (at least the ones that I could take my time to dissecate). I found that the tables are listed as TH_VP31_HUFF_CODES in the file huffenc.c. I tried to investigate a little bit more to see who was setting the bitstream to those tables, but I ended in the fact...

All, About two months ago I posted a patch that hoisted the hottest case statement from a switch statement during ISelLowering. See: http://reviews.llvm.org/D5786 Sean was rather adamant about using a Huffman tree (and I agree this is a more complete solution), so I'd like to put a patch together. That being said, I have a few questions. The current switch lowering code sorts based on case values and is lowered with a combination of binary trees, lookup tables, bit tests and magic. If we lower th...

...patch that hoisted the hottest case >> >> >> statement from a switch statement during ISelLowering. >> >> >> >> >> >> See: http://reviews.llvm.org/D5786 >> >> >> >> >> >> Sean was rather adamant about using a Huffman tree (and I agree this >> >> is >> >> >> a >> >> >> more complete solution), so I'd like to put a patch together. >> >> > >> >> > I think this sounds really cool! >> >> > >> >> >> That...

...(?=class\s+(([.a-zA-Z0-9_:]+Controller\b(\s*<\s*[.a-zA-Z0-9_:]+)?)|(<<\s*[.a-zA-Z0-9_:]+)))(?!.+\bend\b)''; end = ''^\1(?=end)\b''; patterns = ( { include = ''source.ruby''; }, { include = ''$self''; } ); } -- Jeremy Huffman http://www.jeremyhuffman.com

I want to analyse compressed data between VQ and Huffman coding steps. Where in source code can I access to data massive for this goal. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/vorbis/attachments/20090916/4529e42d/attachment-0001.htm

Hello, I'd like to know in detail how does the creation of VQ and Huffman codebooks work in Vorbis. I've used the source code from *encoder_example* as guide, but the only reference I've found is the function *_make_words *inside * vorbis_book_init_encode*, which creates the Huffman tree if I'm not wrong. So I have two doubts. The first is that, for creating...

Hello, I was wondering if it is possible to change the huffman stuff? A different mapping maybe, or maybe it is not too late to change? Decoding is much more efficient if: -- the huffman tree is left-aligned (i.e., longer codes more to the left) -- and we get the bits msb, not lsb Oh, and I need some clarification about the lsp: the purpose of the lsp is to...

...eviously succeeded fails. I run the following script: #!/bin/sh if [ 1 -ne 0 ] ; then echo -n "ellsif:" /usr/bin/time -f "real %e user %U sys %S" ../elsa/ellsif/ellsif -v -O0 -g -o ellbzip2 -D_FILE_OFFSET_BITS=64 $* bzip2.c crctable.c randtable.c compress.c blocksort.c huffman.c decompress.c bzlib.c if [ $? -ne 0 ] ; then exit $?; fi echo -n "1:"; /usr/bin/time -f "real %e user %U sys %S" ./ellbzip2 -1 < sample1.ref > sample1.rb2 echo -n "2:"; /usr/bin/time -f "real %e user %U sys %S" ./ellbzip2 -2 < sample2...

...(including database schema and data) between two of my development machines (laptop and desktop) using only subversion and rake. Migrations aren''t really the answer because this isn''t about promotion, just rapid synching from a single script I can run on either machine. -- Jeremy Huffman http://www.jeremyhuffman.com

-------------- next part -------------- An embedded message was scrubbed... From: "Timothy B. Terriberry" <tterribe@vt.edu> Subject: Re: [Theora-dev] Question about Huffman Tables in Setup Header Date: Fri, 17 Sep 2004 03:43:43 -0400 Size: 3441 Url: http://lists.xiph.org/pipermail/theora-dev/attachments/20040917/99108ff9/Theora-devQuestionaboutHuffmanTablesinSetupHeader.mht

Hello ! A question to all 'Wheel-reinventers': I can build the huffmantrees by hand (on paper) but how to code it? Are there any good URLs out there? Or does the spec supply sufficient information? I tried figure out how oggdec (debugging) does this, but I couldn't get the clou. Thank you Dominik --- >8 ---- List archives: http://www.xiph.org/archi...

Hello, I am a computer engineering student and compression hobbyst and have recently developed a new entropy coding algorithm. It can be used to achieve compression proper of arithmetic coders at very high speeds -almost like Huffman codecs-. Since it could be of interest to you, I send it as an attachment -code and technical report-. Please, drop me a line in case you have any doubt or suggestion. Regards, Eduardo Enrique González Rodríguez. -------------- next part -------------- A non-text attachment was...

I don''t want to put certain code in my controller because I think it makes things more confusing. What is the best way to manage business logic such that it doesn''t end up in the controller? Basically, where should I put my regular utility classes and backing objects that may not be models? Thanks, Wes -- Posted via http://www.ruby-forum.com/.