problem computing/parsing oggs/opus audio files header
I am reading an ogg audio file header and am having some difficulty understanding how to compute the location of the next ogg file segment. i was able to use this webpage as an example: https://www.file-recovery.com/ogg-signature-format.htm using this example.ogg file i was able to compute the right locations of the oggs headers.
BUT... in the example link, at offset (dec) 128 + 1 there is FF FF FF FF FF FF FF FF FF FF FF FF B6 and calculating this is simple, 12*255 = 3060, 3060 + 182 (hex B6) = 3242, 3242 + 1 + 13 + 128 = 3384. so from the start of the last read header 0x3A (dec 58), if i seek a total of 3384 bytes, i am exactly at the spot of the next ogg file header.
now, where my problem comes in is this. in a real ogg/opus file, the values to calculate where the next ogg header are slightly confusing me. here is an image hopefully it will make it a little easier to get my problem across.
i am not sure how to proceed here. 0x48 = dec 72. so i would assume that there are 72 records here that are 3 bytes long each? that doesnt make sense. Or would it be 72 records, and the 0x03 at offset 0xAC is just part of the calculation? this is confusing to me, and i am not sure if i am asking the question right. but what i am trying to do is just parse the whole ogg file from top to bottom. im not looking to do any sort of processing at each header (yet) and i just need to fogire out the correct way to calculate these ogg header/segment location. if i need to elaborate on anything please ask and i will do my best. thanks in advance
i was able to figure this out. was just a simple misunderstanding on my part. when you read (as in the example above) 0x48 = dec 72. next add current position in file, then add 72 to that, then add/sum the next 72 characters, whatever they may be. this will give you the offset ((from the beginning of the file) of the next ogg entry
- How to extract images from a string in PHP?
- How to build the antlr grammar provided?
- How to scrape iframe content using cURL
- cannot use operator[] with a string argument with array (parsing json)
- PhysicalAddress.Parse() won't parse lower cased string, is this a bug?
- How do I parse a string to a float or int?
- How do I create a comma delimited string from an ArrayList?
- Escaping, unicode, character escapes while parsing/logging string in javascript
- Getting rid of spaces in a returned string in bash
- Parse XML in Haskell
- How can I parse (read) and use JSON in Python?
- Parsing a source code with just one digit
- How to parse complicated JSON data in rust correctly?
- PHP/HTML - Multiple page screen scrape, export to .txt with commas between dates and values
- How to create a custom type to parse [u8;32] from a json that contains a hex string in Rust
- Why can't DateTime.Parse parse UTC date
- C# double.TryParse with InvariantCulture returns unexpected result
- Optimizing a java multithreaded server that uses an inputstreamreader
- Map on conditional produces jq: error Cannot iterate over null (null)
- Parse a search string into words and treat words within double quotes as a single term
- Get timestamp from old data file
- Is there a multiple character version of strchr() in the standard C libraries?
- How to read constituency based parse tree
- Parse indentation level with PEG.js
- Parse executable console output in batch file
- How to parse search engine keywords input
- PHP: Best way to extract text within parenthesis?
- How to parse a string to an int in C++?
- How best to parse a simple grammar?
- Convert fraction to float?