similar to: possible regression in libogg

Am 03.12.2013 23:49, schrieb Monty Montgomery: > Any time code is stuck in a loop calling ogg_sync_pageseek() or > ogg_sync_pageout(), you'll see most of the time sunk into checksum > calculation. It's the only thing in libogg that _can_ take much time. > This is not likely a libogg bug, but a bug in the code calling libogg > in a tight loop. > > Looking at the file

I may be missing something, but is there a good way of finding the start position of an ogg page in a bitstream? Pages have to start with 'OggS', but this could also turn up elsewhere in the bitstream, so is there a simple strategy using the libogg API to find out which ones are the start of pages? (Other than trying to decode from successive 'OggS' markers and noting when the

Ok I just finished writing a Vorbis encoder/decoder, and here are some of my comments (I'm sure some of these are well known, but here they are anyway - sorry this is long): 1. vorbis_info: a. Accessing the pre-computed info structs through pointers to static data is messy IMO. I should be able to vorbis_info_init (or similar) an info struct to be exactly the same as info_A, for

Any time code is stuck in a loop calling ogg_sync_pageseek() or ogg_sync_pageout(), you'll see most of the time sunk into checksum calculation. It's the only thing in libogg that _can_ take much time. This is not likely a libogg bug, but a bug in the code calling libogg in a tight loop. Looking at the file listed in the bug, there's a page discontinuity at the very beginning; after

I'm updating my vorbis rpm spec file, and when I try to do "make -C vorbis-tools ogg123", due to rpm's build environment, I get lots of: gcc ogg123.o -o ogg123 -lm ../lib/libvorbis.a ../lib/vorbisfile.a ../lib/vorbisfile.a(vorbisfile.o): In function `_get_prev_page': vorbisfile.o(.text+0x54): undefined reference to `ogg_sync_reset' vorbisfile.o(.text+0xa9): undefined

It seems to me that running ogg_sync_pageout doesn't automatically advance the page. This is good if you haven't worked with the given page, makes coding somewhat easier. However, when does a page advance. Is it after a call to ogg_stream_pagein? On a side note, I need to do seeking on top of libvorbis, I'd love to use vorbisfile but sadly I can't. Is there a reasonable way to

I need to be exposed to a way of seeking theora streams. I have repeatedly found the same question asked on a different forums but could not find an answer. I'm working on a game and started integrating video with theora, the sound works just fine with ogg/vorbis(i find it easy to seek using ov_raw_seek for audio files). Could someone please point me to some example/code of how can i seek with

Hopefullly this is once again something trivial I'm missing. I'm still trying to figure out how to pull a part a stream. I get two out the three theora headers I can see in the file (http://v2v.cc/~j/theora_testsuite/320x240.ogg) if I use the buffer in the page struct and nothing usable if I try to use the packet structs. Hopefully this is once again something something trivial I've

Hello, All. First, I want to thank Ian Malone and Ralph Giles, thanks for your kind replies. But I still have problems about seek. As you suggested, I could use ov_open_callbacks() to supply my own read/write/seek functions. So, can you give me an example? I?m sorry for my ignorance, because I haven?t used callbacks before. I analyzed the vorbisfile.c in Tremor, and I think I

I wish I would have come across this in time for the libogg-1.1.1 release... Maybe I'm doing something wrong but here it is. One FLAC compressed frame becomes one packet when encapsulated in Ogg, and FLAC packets can be much larger than the nominal 4k page size. For CD audio they are usually 10-15Kbytes. Imagine this Ogg stream where the lines denote page boundaries and the x's are one

hi all: i downloaded libtheora1.0.tar.gz from xiph.org, and when i compile it, such error message popped. i tried to run player_example.c under /libtheora_1.0/examples/. error message: ivysummer at ivysummer-desktop:~/??/libtheora-1.0/examples$ gcc -o player player_example.c /tmp/ccpyle3c.o: In function `buffer_data': player_example.c:(.text+0x15): undefined reference to

ok, I'm aware that vo_open cant be used at the same time as other functions such as ogg_sync_wrote, ogg_sync_pageout, ogg_stream_pagein, ogg_stream_packetout and vorbis_synthesis_headerin. In order to get information from the bitstream i've been using this method because it's fast and doesn't require decoding of the stream. But, i can only retrieve the average bitrate of

I'm currently working on a speex + theora webchat. I have both working alone, but to make them work together and to know where the package goes, I'm trying to use ogg packages. With theora there has been no problem, but with speex I can't make it work. The problem is that for a second it works great, but then it begings to gain lag, and in a little time it has 5-10 lag seconds (into

dear list, i am trying to write a small program which reads an ogg file and writes it to another ogg file (and changes serial number, granulepos etc on the fly). reading the ogg file is ok (ogg_sync_pageout, ogg_stream_pagein, ogg_stream_packetout). but writing the file doesn't work - the granulepos and page structures don't match with the original file. here's what i am doing.

Hi people, I'm writing a decoder that uses libtheora on Windows and Linux. Decoding works well by now. I have a couple of problems with it, that I just can't seem to figure out. I'll write each of them in a single mail, so it's easier to answer individual problems. The first problem I have is seeking, when it's playing files. I have implemented a weighted binary jump

Greetings, How does the ogg_page_bos function work? I call this function directly after calling ogg_sync_pageout. It works. Then I place a guard around it until the start of a new stream (chain mode). If this is the start of a new stream, should it return zero after the next call. I looked in ogg_page structure to see if there is a member named b_o_s, but I did not see anything. What is being

Hello everybody, I'm new to this mailing list so I'm sorry if it's the wrong place to post this. I'm developing a Speex player and I need to seek with a precision of milliseconds. I used liboggz that supposedly does just that, but it never seeks exactly where it should. For example if I use oggz_seek_units(oggz, 18450, SEEK_SET) result it's 16386 and there is a delay between

I am writing an Ogg Vorbis decoder for win32. I want a memory buffer which is aligned to the disk sector size (512 bytes on hard disk, 2048 bytes on cd/dvd), so that the win32 function ReadFile can be persuaded to do 'unbuffered IO'. Unfortunately, the ogg_sync_buffer() call gives me a pointer from its own, internally allocated buffer. I have found no docs to indicate that this would

Oleksij Rempel <bug-track at fisher-privat.net> > On 05.06.2012 20:41, Martin Leese wrote: ... >> On 6/5/12, Oleksij Rempel wrote: >> || We need fallowing tags: >> || creation datetime: seconds and time zone should be included. >> || source host: it can be name or guid. to organise created files by >> sources. >> || keywords,events. >> || date

I'm trying to adapt decoder_example to to support more of an event driven model. I'm building an RTSP client/server where the client will have a function called everytime a new packet comes in. So, I want to queue up these packets to be played. My current attack is as follows (note this isn't very robust and I realized that): For first and second packet i grab all the header stuff