similar to: [Fwd: Re: Question about Huffman Tables in Setup Header]

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 counts(Huffman code sets) from tens thousands of

-------------- next part -------------- An embedded message was scrubbed... From: "Timothy B. Terriberry" <tterribe@vt.edu> Subject: Re: [Theora-dev] Theora mcomp tuning... Date: Wed, 15 Sep 2004 11:15:06 -0400 Size: 1329 Url: http://lists.xiph.org/pipermail/theora-dev/attachments/20040915/b5cce84d/Theora-devTheoramcomptuning...mht

It's not that hard to repackage it, is it? Here you go: www.icer.nl/misc_stuff/flac.xcodeproj .zip On 06-05-13 23:37, Marcus Johnson wrote: > Ralph, for Mac OS you should download either the Unarchiver which is > free, or Entrophy which is what I use, but it costs like $15 I > believe, both support decompressing .7z and Entrophy supports > compressing TO .7z > > > On

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

Yes, regarding the unsigned to signed conversion you are right, it is implementation defined. I just had an issue a couple of years ago with a compiler which incorrectly treated unsigned overflow as undefined rather than implementation defined? Regarding the 64 bit profiling: I looked at the disassembly (gcc ?c ?S ?O2 ../opus/silk/sum_sqr_shift.c ?I../opus/include ?I../opus/celt) of the 64 bit

Good day! I'm creating HDL IP CORE (for using in FPGA) for theora encoder (now 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

Thank, Timothy! I add this stages. About RLE: I have one more unresolved stage. Mike Melanson wrote in "VP3 Bitstream Format..." about RLE using: "* Zigzag Ordering: After transforming and quantizing a block of samples, the samples are not in an optimal order for run length encoding. Zigzag ordering rearranges the samples to put more zeros between non-zero samples." If we pass

On 25 February 2015 at 19:54, Timothy B. Terriberry <tterribe at xiph.org> wrote: > Viswanath Puttagunta wrote: >> >> Can we please have review on RFCv2? We have quite a few optimizations >> (Eg: ifft/mdct_backwards, fixed point fft/ifft mdct_forward/backward >> etc) that are in my pipeline that depend on this patch series being >> accepted. > > >

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 the Huffman tree (and

Ralph, for Mac OS you should download either the Unarchiver which is free, or Entrophy which is what I use, but it costs like $15 I believe, both support decompressing .7z and Entrophy supports compressing TO .7z On Mon, May 6, 2013 at 3:00 PM, <flac-dev-request at xiph.org> wrote: > Send flac-dev mailing list submissions to > flac-dev at xiph.org > > To subscribe or

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 find a low-bitcount approximation of

Hi Drew, Thanks for the update. Your patch is now in master. Now, it would be good if you could think of a way to reduce the stack usage as we discussed. Cheers, Jean-Marc On 11/07/2017 04:28 PM, Drew Allen wrote: > Here's another patch. Cheers! > > On Mon, Nov 6, 2017 at 10:08 AM Drew Allen <bitllama at google.com > <mailto:bitllama at google.com>> wrote: >

Hi Drew, Your ambisonics patch is already merged. Can you send a patch that applies to master? Jean-Marc On 11/08/2017 07:05 PM, Drew Allen wrote: > Hey Jean-Marc, > > I found a bug regarding exporting the matrix that wasn't always grabbing > the correct values, causing incorrect mixing behavior. This patch > resolves that issue. > > Cheers, > Drew > > On

On 3 February 2015 at 01:31, Phil Wang <Phil.Wang at arm.com> wrote: > Hi all, > > I have already added support for scaled forward non-power-of-2 floating-point FFT: > https://github.com/projectNe10/Ne10/commit/79c3d787302f8d74b9bcfe6545d487cdf1b101d9 > > Two flags are added to cfg structure: is_forward_scaled and is_backward_scaled. > By setting is_forward_scaled to

Hi all, I have already added support for scaled forward non-power-of-2 floating-point FFT: https://github.com/projectNe10/Ne10/commit/79c3d787302f8d74b9bcfe6545d487cdf1b101d9 Two flags are added to cfg structure: is_forward_scaled and is_backward_scaled. By setting is_forward_scaled to anything but zero, ne10_fft_c2c_1d_float32_neon will scale the output. So we can remove need for one buffer on

Hi all, Attached is a quick patch that addresses a bug when exporting the matrix from the encoder. Cheers, Drew On Wed, Nov 8, 2017 at 4:44 PM Drew Allen <bitllama at google.com> wrote: > Sure, ill send that asap > On Wed, Nov 8, 2017 at 4:44 PM Jean-Marc Valin <jmvalin at jmvalin.ca> wrote: > >> Hi Drew, >> >> Your ambisonics patch is already merged. Can

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

Hi Drew, We're getting there... Some minor comments: 1) The public header file should not have an #ifdef ENABLE_EXPERIMENTAL_AMBISONICS since that would require the user code to define it. 2) Why do you have #define MAPPING_MATRIX_C ? 3) Looks like MAPPING_MATRIX_MAX_SIZE is not longer useful, right? 4) Even though it's not strictly necessary here, please add parentheses to the

alpha thinktink wrote: > On Sat, Aug 24, 2013 at 7:56 PM, Timothy B. Terriberry > <tterribe at xiph.org <mailto:tterribe at xiph.org>> wrote: > > alpha thinktink wrote: > > is returning in tags handlers. So of course when I call > opus_tags_clear > > or any other tags modification routine on an OpusTags struct with > > contents

alpha thinktink wrote: > On Sun, Aug 25, 2013 at 8:53 PM, Timothy B. Terriberry > <tterribe at xiph.org <mailto:tterribe at xiph.org>> wrote: > > alpha thinktink wrote: > > You've got "_host" instead of "_user" in the definition for the macro > > for "OP_HTTP_PROXY_USER" > > Yeah, already fixed in >