similar to: Reg. vorbis for real-time audio

Hi, I am a bit confused on how code-words are derived from the codeword lengths. I will appreciate if someone can point me in the correct direction. I will take the example of an actual codebook that i found in a valid vorbis encoded file as shown below. [SK] +------Codebook [0] -------- [SK] Codebook Dimensions = 1 [SK] Codebook Entries = 8 [SK] Unordered [SK] 1, 6, 3, 7, 2, 5, 4, 7, [SK] NO

Hi, All help is appreciated. I am looking at the function "vorbis_staticbook_unpack" in codebook.c I guess this function just reads the codebooks in some structure (static_codebook) and does not actually map the codewords to the codevalues. Does anyone know what functions can I use in this function to actually view this mapping? I just want to display something like below: I can

Hello folks, The codebook infrastructure for Vorbis is now well underway. This is it! The last piece needed for *real* bitstreams. To that end, I have a decent VQ codebook generator running. I was originally using some farily typical merge/split algorithms and then decided that the right way to do this was to model a VQ codebook as an m-dimensional set of bubbles (like a foam). I know there

Hi, in libvorbis/lib directory, I see a coupple of programs that do not get compiled. For example, barmel.c etc. I can ofcourse compile them through command line, but is there any easier way of doing this. I noticed that codebook.c can also be executed independently (it has a main function) . How can i do this? Thanks in advance, Shank

Hi, I was looking at some of the vorbis-ogg music files using hexedit. I am a bit confused about this filed "page_sequence_number" that appears in the header for ogg. From RFC3533 the definition of this field is: "page_sequence_number: a 4 Byte field containing the sequence number of the page so the decoder can identify page loss. This sequence number is increasing

Hello, Thanks in advance for any help, I have read a CSV file in which there is a column for an IP addr as in: tmpInFile$V2 [1] "74.125.224.38" "74.125.224.38" "129.46.71.19" "129.46.71.19" [5] "129.46.71.19" "129.46.71.19" "129.46.71.19" "129.46.71.19" [9] "129.46.71.19" "129.46.71.19"

Hi, Does anybody know how codebooks are generated in OggVorbis encoder? We are porting oggorbis encoder on embedded platform for which VQ codebook memory is hugeeee to imagine. How can we reduce that? Can we do VQ with less codebooks and if yes how? If any help available? Parul Embedded Engineer Einfochips Ltd

Hi, I would like to ask if someone couldhelp me. I am writing a decoder for ogg-vorbis. I am not using the libvorbis because we want a code using our memory functions and I am going to rip some of the decoder functionality as we want only to use mono, 44.100, 96-160kbs sound files. We want to write the fastest and cleanest code possible even using assembler functions where possible. I have

Hi, This is a repeat question. Earlier I had asked the same question and eventually found the ans. (http://lists.xiph.org/pipermail/vorbis-dev/2005-August/018179.html) However now when I try the same thing somehow I am not able to use debugging. To use debugging, i compiled the source using the folloing commands,. >make clean >./autogen.sh --enable-DEBUG >make The configure.in has

Hi, We are porting the Ogg Vorbis fixed point decoder to a 24 bit fixed point precision processor. We are trying to reduce the number of cycles for MIPS optimization. In this process we observed that most of the songs do not have "maximum codeword length" greater than 24 bits. We are planning to reduce most of the double word operations (in our case 32 bit data is stored as double

hello, does anybody know whether the codewords have a special meaning? whether they have a different influence like the quantization matriy in jpeg? e.g. do lower or the first entries have a greater influence than the last or higher codewords? thanks gerald

During the interesting interview that binaryfreedom has made with Monty and Jack, Monty mentions cascading, a feature that will be added, quote: "Cascading is the ability to make multiple passes through the frequency spectrum, iteratively filling in more detail, like a progressive jpeg". What are the advantages of something like this - does this generally improves quality or is it used

I've made a block diagram of the encoder because I tried to find out, how it works http://stoffke.freeshell.65535.net/ogg/block.html Although there are specifiation docs, that give very detailed information about single aspects of the encoding (or decoding) , I'm missing documenations that give a more general overview, about how the encoder works. (Vorbis Illuminated seems a bit

Hello Monty, Sorry for the wrong subject title last time. A little more clarification needed. When reading bit-by-bit, there is no MSb/LSb, just 'first bit' and 'last bit'. The Huffman tree is traversed from 'first bit' to last bit'. This is a conceptual layer above the bitpacker; all you need to know is what order the bits come out, which happens to be LSb-first.

Hi all, I'm porting the Tremor code to an ARM platform. Unfortunately, we didn't use the low mem branch code for CPU performance consideration, and now I find the memory use in it is huge for the embedded system. After looking into the code, I found the header parse, especially, the codebook unpack part takes a lot of memory. Tremor decodes the codebooks to a cache to store

alpha. (that about sums it up) Will encode and play back via an sdp file and multicast on one computer (over the net if you transfer the sdp file over by hand). rc/rtenc3 and src/rtdec3 are in the style of encoder/decoder_example ...so this means you MUST edit it them to suit your system. For example, I specify my rtenc3 to multicast just on eth1 (to avoid pissing off my cable supplier on

Monty Montgomery wrote: > Yes. Without the first three packets (which hold all the codec > settings and all the instruction how to handle the subsequent packets) > the rest of the stream is gibberish. Vorbis can't even unpack the > bits without the codebooks packed into the third header. Curiosity man here. Is there a finite set of predetermined codebooks or is the codebook

I was just somewhat curious as to what lossless compression is used... is it just huffman? Tony Arcieri --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/

Hi, Please brace yourselves for some possibly stupid questions. Why are there only 2 codebooks for floors and many more for residue values? What makes the encoding of floor values fundamentally different from encoding residue values? I have a basic understanding of VQ, and looking at the floor decode function, it all makes sense 1) Read the codebook index from the stream 2) Do a

Anexed is my function for reading codebooks and the Vq Table. My problem is: I read a codeBook number of 41, so i called this function above 41 times. The firtst time, the sync patterns (BCV) is alligned correctly, so it reads correctly. the sencond time it is executed, the patter is not there anymore and there are only 8 BCV in my file. function fReadBits1 is the same as the ogg's read bit