XiphWiki - User contributions [en]

Tremor

2021-03-18T19:10:49Z

Tmatth:

Tremor is a fixed-point version of the Ogg Vorbis decoder for those platforms that can't do floating point math.

== Platforms ==

=== ARM CPUs ===

You will probably want to use the Tremor main branch. You can check it out here:

<code>
git clone https://gitlab.xiph.org/xiph/tremor.git
</code>

It contains some optimizations for ARM and the overall lowest computational complexity. It should run on most devices with a few hundred KB of codec RAM. The configure script should automatically enable ARM assembly code on ARM systems, however you can also force it by defining _ARM_ASSEM_.

=== Coldfire/MIPS/other ===

Tremor currently does not have CPU specific optimization for less common embedded CPUs. In this case the main branch will probably give very good performance if CPU optimized fixed point multiply and complex multiply functions are added.

=== Texas Instruments TMS320C55x DSP Family ===

Download the generic lowmem source using [http://subversion.tigris.org/ Subversion].
This is probably the version you want to start working with for a DSP, but may be slower on normal CPUs.

<code>
git checkout lowmem
</code>
There is also a [https://gitlab.xiph.org/xiph/tremor/-/tree/nobyte no-byte branch] for platforms whose smallest data unit is larger than 8 bits.

Required / Suggested Changes to the code as downloaded:

* Roland Wintersteller's various fixes
See the [http://lists.xiph.org/pipermail/tremor/2004-October/001114.html mailing list entry]
* Johannes Sandvall's performance improvements
See the [http://lists.xiph.org/pipermail/tremor/2004-March/000957.html mailing list entry]
* alloca removal
The TI compiler does not support this.
* misc compiler warning fixes
* hooks to TI DSPLIB functions cfft3216_NOSCALE and cbrev32
These are part of the TI DSPLIB which can be [http://www-s.ti.com/sc/psheets/sprc100/sprc100.zip downloaded] from the TI website.
* [http://lists.xiph.org/pipermail/tremor/attachments/20041029/30a4905c/misc.h 64-bit math functions]
* converting all ints assumed to be 32 bits to ogg_int32_t

== Memory Usage ==

The exact memory requirements for Tremor depend on the file to be decoded as Vorbis allows encoders to use different features in different files. Typical Vorbis files will need several hundred KB of memory (this includes the binary as well as malloc buffers) in the main branch, and somewhat less in the lowmem branch. Some very old (and rare) files may need 500KB or more to decode. Systems with much less then 250KB of codec memory should probably use the slower low memory branch, and should take care to fail gracefully if a call to malloc fails. This will result in the overwhelming majority of Vorbis files decoding correctly.

== Links ==

* [https://gitlab.xiph.org/xiph/tremor Tremor Main Branch]
* [https://gitlab.xiph.org/xiph/tremor/-/tree/lowmem Tremor Low Memory Branch]
* [http://lists.xiph.org/pipermail/tremor/ Tremor Mailing List] - lots of info here, but have to wade through a lot!
* [http://git.rockbox.org/?p=rockbox.git;a=tree;f=lib/rbcodec/codecs/libtremor Rockbox Optimized Tremor Fork] - Highly optimized version of Tremor for ARM and several other embedded CPUs

Main Page

2021-03-02T14:28:35Z

Tmatth: Mention Daala with other codecs

In an effort to bring open-source ideals to the world of multimedia, the [[Xiph.Org Foundation]] develops a multitude of amazing products. This wiki describes our free and open protocols and software.

== Demonstrations of Xiph technologies ==

Want to hear or see Xiph in action? These projects are using our codecs, formats, or libraries.

=== Audio ===

* [[OpusSupport]]: List of software and services supporting the [[Opus]] codec
* [[VorbisStreams|Vorbis Streams]]: Stations streaming with the [[Vorbis]] codec
* [[Games that use Vorbis]]: Games using the Vorbis codec for music or sound effects
* [[VorbisHardware|Vorbis Hardware]]: Hardware players using the Vorbis codec
* [[VorbisSoftwarePlayers|Vorbis Software Players]]: list of media players with out-of-box support for Vorbis

=== Video ===

* [[TheoraHardware|Theora Hardware]]: Hardware using the [[Theora]] video codec
* [[TheoraSoftwarePlayers|Theora Software Players]]: list of media players with Theora support
* [[List of Theora videos]]: Sources for video encoded with Theora

== Projects/Formats ==

=== Container Formats ===

* [[Ogg]]: Media container. This is our native format and the recommended container for Xiph codecs.
** [[Ogg Skeleton]]: Skeleton information on all logical content bitstreams in Ogg.
** [[MIMETypesCodecs|Specification of MIME types and respective codecs parameter]]
* [[SpeexRTP]]: RTP payload format for voice
* [[VorbisRTP]]: RTP payload format for general audio
* [[TheoraRTP]]: RTP payload format for video
* [[XSPF]]: XML Sharable Playlist Format

=== Codecs ===
====Compressed Audio/Video====
* [[OpusFAQ|Opus]]: Lossy, low-latency, general-purpose audio codec
* [[Vorbis]]: Lossy audio codec with a [[Tremor|fixed point decoder]]
* [[FLAC]]: Free Lossless Audio Codec
* [[Theora]]: Lossy video codec
* [[Daala]]: Lossy experimental video codec, tools later merged into [https://en.wikipedia.org/wiki/AV1 AV1]
* [[Speex]]: Speech codec (obsoleted by [[OpusFAQ|Opus]])
====Uncompressed Audio/Video====
* [[OggPCM]]: Audio codec
====Timed Text/Metadata====
* [[OggKate|Kate]]: Format for lyrics and subtitles
* [[CMML]]: Continuous Media Markup Language, used for [http://www.annodex.net/ Annodex] and subtitles (xine, vlc, gstreamer, and DirectShow support; obsoleted by [[OggKate|Kate]])

=== Software ===

* '''Software for distributing media'''
** [[Icecast Server|Icecast]]: Streaming server
** [[IceS]]: Source client for Icecast servers

* '''Libraries'''
** [[OggPlay]]: library for synchronised Xiph media playback
**[[XiphQT]]: Quicktime component to play the main Xiph formats
** [[VorbisCommentEdit]]: Macintosh Framework making it easy to incorporate the editing of [[VorbisComment|Vorbis Comments]]

* '''Other software'''
** [[OggComponent/VorbisComponent]]: Wrappers to integrate Vorbis into Mac OS X (does not yet support encoding)
** [http://xiph.org/paranoia/ cdparanoia]: CDDA extractor/ripper

=== Community ===

*[[How to help]]
*[[Spread Open Media]]: project to promote Xiph formats.
**[[MailOgging]]: provides templates for anyone willing to contact a company requesting them to add support for Xiph formats.
*[[People]]: Who's who in Xiph.

=== Work in Progress ===
* [[Work In Progress]]: codecs and software still in the research and development stages.
* [[Todo]]: To-do list for various Xiph projects.

== Project management ==

* [[AdminProcesses]]: who's in charge of what project
* [[MonthlyMeeting]]: page with information on Xiph's MonthlyMeeting
* [[MailingLists]]: list of Xiph's mailing lists
* [[Bounties]]: list of bounties that you can take to improve Xiph's projects

== Resources for Video and Audio programmers ==

* [[Ambisonics]]: page with technical information on Ambisonics
* [[Videos|Educational Videos]] about audio/video technology.
* [[Resources and papers on Audio, Music and Speech|Courses and papers on Audio, Music and Speech]]: page with links to MIT and other universities' content
* [[Oggless]]: for ideas on how to use the different Xiph codecs outside Ogg

== Wiki internal ==

* [[XiphInfra:List of services]]: List of services the Xiph.Org Foundation uses.
* [[Translations]]: Do you feel like helping us with some translation work?
* [[XiphWiki:Sandbox]]: Test page for testing your Wiki-editing skills.
* [[XiphWiki:Copyrights]]: License used for all content posted on the XiphWiki.
* [[Logos]]: Logos of the various Xiph projects.

AdminProcesses

2019-04-26T03:18:41Z

Tmatth: /* Administration Information */ Added myself as Speex maintainer

= Administration Information =

Xiph is a benevolent dictatorship led by Monty, but decisions on administrative things are delegated to a committee. The committee consists of Monty, Ralph Giles, Jack Mofitt, j^, and Silvia Pfeiffer.

=== Formats/Projects ===
* [http://en.wikipedia.org/wiki/Annodex Annodex]: Silvia Pfeiffer, Conrad Parker
* [[CMML]]: Silvia Pfeiffer, Conrad Parker
* [[FLAC]]: Erik de Castro Lopo
* [[Icecast]]: Thomas Rücker
* [[Skeleton]]: Conrad Parker
* [[Speex]]: [[User:jmspeex|Jean-Marc Valin]], Tristan Matthews
* [[Opus]]: [[User:jmspeex|Jean-Marc Valin]]
* [[Theora]]: Ralph Giles
* [[Daala]]: Tim Terriberry, Jack Moffitt
* [[Vorbis]]: Monty
* [[XSPF]]: Lucas Gonze, [[User:Saoshyant|Ivo Emanuel Gonçalves]], [[User:Sping|Sebastian Pipping]]

=== Other ===
* [[Spread Open Media]]: [[User:Saoshyant|Ivo Emanuel Gonçalves]]
* Xiph Web: ePirat
* Xiph Wiki: ePirat, j^
* Xiph SVN: j^

== Decision process ==

Anything that looks like it's officially authorised by Xiph needs approval.

This may be something that goes on the web or on the wiki or anywhere else.

If you would like something to as officially authorised, get approval from somebody on the committee (ultimately from Monty if it's unresolvable) beforehand.

For web pages, you should in particular not edit them in svn or send a patch to the web maintainer unless you have approval.

== See also ==
* the [[People]] page for an overview of everyone in Xiph

People

2016-01-21T00:28:32Z

Tmatth: Added Daala to my projects

This page is meant to help with nickname-to-person lookup.
''Nickname'' can be a mail alias, an IRC nick, or a Subversion user — in most cases several of these.

Please help to fill this table. Keeping your own entry up to date is a good start.

{| class="wikitable" border="1" cellspacing="1" cellpadding="4" width="100%"
!colspan="3"| Who Is Who
|-
! Nickname
! Real name
! Keywords
|-
| arkadini
| Arek Korbik
| Quicktime, XiphQT
|-
| basilgohar
| Basil Mohamed Gohar
| opus, legal
|-
| ben
| Benjamin Gérard
| libao
|-
| BjornW
| Björn Wijers
| [[Spread Open Media]], [[XSPF]]
|-
| [[User:Conrad|conrad]]
| [http://blog.kfish.org/ Conrad Parker]
| see ''[[#nick_kfish|kfish]]''
|-
| derf
| [http://people.xiph.org/~tterribe/ Timothy B. Terriberry]
| theora, CELT, video, daala
|-
| dllmain
| Sebastian Pipping
| see ''[[#nick_sping|sping]]'', nick not used anymore
|-
| dm8tbr
| Thomas B. Rücker
| icecast
|-
| doublec
| Chris Double
| firefox, theora, Mozilla
|-
| drac667
| Cristian Adam
| DirectShow, oggcodecs, Windows
|-
| ds
| David Schleef
| theora, dirac, gstreamer
|-
| erikd
| Erik de Castro Lopo
| FLAC maintainer
|-
| [[User:EPirat|ePirat]]
| Marvin Scholz
| Web, Wiki, Icecast
|-
| [[User:GChriss|gchriss]]
| George Chriss
| gstreamer, Elphel, event videography
|-
| giles
| [http://people.xiph.org/~giles/ Ralph Giles]
| see ''[[#nick_rillian|rillian]]''
|-
| gmaxwell
| Gregory Maxwell
| Wikimedia, CELT, theora, daala
|-
| gnafu
| Gideon Mayhak
| community, testing
|-
| [[User:Silvia|ginger]]
| Silvia Pfeiffer
| see ''[[#nick_nessy|nessy]]''
|-
| [[User:Imalone|imalone]]
| Ian Malone
| metadata
|-
| illiminable
| Zentaro Kavanagh
| DirectShow, dsfilters, Microsoft
|-
| [[User:Saoshyant|ivo]]
| Ivo Emanuel Gonçalves
| advocacy, [[Spread Open Media]], [[XSPF]], wiki mod, vorbis-tools
|-
| jack
| Jack Moffitt
| libao, treasurer, Icecast
|-
| jcoalson
| Josh Coalson
| FLAC author
|-
| j, j^
| Jan Gerber
| v2v, ffmpeg2theora, sysadmin
|-
| [[User:jmspeex|jmspeex]]
| [http://jmvalin.ca/ Jean-Marc Valin]
| Opus (CELT), Daala, Speex
|-
| jmworx
| Jean-Marc Valin
| see ''[[#nick_jmspeex|jmspeex]]''
|-
| JoeyBorn
| Joe Born
| neuros
|-
| karl
| Karl Heyes
| Icecast
|-
| [[User:Conrad|kfish]]
| [http://www.kfish.org/ Conrad Parker]
| annodex, fishsound, hogg, oggz, vorbis-tools
|-
| laser13
| Marcin Lubonski
| annodex, oggplay, win32
|-
| lgonze
| Lucas Gonze
| [[XSPF]]
|-
| lu_zero
| Luca Barbato
| RTP Vorbis, RTP Theora, Gentoo
|-
| maikmerten
| Maik Merten
| theora, java, macos
|-
| MikeS
| Michael Smith
| fluendo, gstreamer, sysadmin, IceS
|-
| Monty
| Christopher Montgomery
| see ''[[#nick_xiphmont|xiphmont]]''
|-
| msmith
| Michael Smith
| see ''[[#nick_mikes|MikeS]]''
|-
| nessy
| Silvia Pfeiffer
| annodex, vquence, sysadmin, CMML
|-
| ozone
| André Pang
| annodex, macos
|-
| pjones
| Peter Jones
| cdparanoia, redhat
|-
| rillian
| [http://people.xiph.org/~giles/ Ralph Giles]
| metadata, video, theora, MNG, sysadmin
|-
| ribamar
| Ribamar Santarosa
| etheora
|-
| Saoshyant
| Ivo Emanuel Gonçalves
| see ''[[#nick_ivo|ivo]]''
|-
| segher
| Segher Boessenkool
| vorbis, audio
|-
| shans
| Shane Stephens
| annodex, oggplay
|-
| silvia
| Silvia Pfeiffer
| see ''[[#nick_nessy|nessy]]''
|-
| smarter
| Guillaume Martres
| libvpx
|-
| [[User:sping|sping]]
| Sebastian Pipping
| [[XSPF]], [http://libspiff.sourceforge.net/ libSpiff], [http://validator.xspf.org/ XSPF Validator]
|-
| TD-Linux
| [http://thomasdaede.com/ Thomas Daede]
| Daala hardware
|-
| tmatth
| Tristan Matthews
| daala, VLC, speex
|-
| tterribe
| [http://people.xiph.org/~tterribe/ Timothy B. Terriberry]
| See ''[[#nick_derf|derf]]''
|-
| thomasvs
| Thomas Vander Stichele
| fluendo, flumotion, gstreamer
|-
| unlord
| Nathan Egge
| daala
|-
| volsung
| Stan Seibert
| libao
|-
| xiphmont
| Christopher Montgomery
| vorbis, ghost, audio, Ogg, cdparanoia, daala
|-
| zen
| Zentaro Kavanagh
| see ''[[#nick_illi|illi]]''
|-
|}

[[Category:Developers stuff]]

Icecast Server

2016-01-20T06:19:17Z

Tmatth: Undo revision 16196 by Smith331 (talk) due to spamming links

[[File:Icecast_Logo.svg|100px|left]]
Icecast is a streaming media server which currently supports [[Ogg]] ([[Vorbis]] and [[Theora]]), [[Opus]] and WebM streams. 
MP3 works too, but it is not officially supported due to its non-free nature.

It can be used to create an Internet radio station or a privately-running jukebox and many things in between. 
It is very versatile in that new formats can be added relatively easily and supports open standards for communication and interaction.

Icecast is distributed under the GNU GPL, version 2.

== Icecast Articles ==

{{Special:PrefixIndex/Icecast Server/}}

== External Links ==

* [http://www.icecast.org/ Icecast homepage]
* [http://dir.xiph.org/index.php Stream directory]
* [http://dir.gmane.org/gmane.comp.audio.icecast.general Icecast mailing list archive] - You can search or browse Icecast user discussions here.
* [http://dir.gmane.org/gmane.comp.audio.icecast.devel Icecast developer mailing list archive] - You can search or browse Icecast discussions on icecast development here.
* [http://icecast.imux.net/index.php Unofficial(?) Icecast forum]

== Development ==

You can find more information about the [[Icecast/Git_workflow|development workflow]] on a dedicated wiki page.

== Wish List ==

As good ideas are never a waste (and for tracking purposes) please list all the features you're missing in the icecast trunk as separate tickets on [https://trac.xiph.org/newticket?component=Icecast%20Server trac.xiph.org].

Note: please check that the feature you request is not already in trunk before posting!

[[Category:Icecast]]

__NOTOC__

Daala Quickstart

2015-07-04T13:22:28Z

Tmatth: /* Linux */

This is a guide to getting a copy of the latest code and encoding a video.

There is also a '''[[Daala Quickstart Windows]]''' page.

== Installation ==

=== Obtaining dependencies ===
==== Linux ====
You'll need:

* Standard build tools (autoconf, automake v1.11 or later, libtool, pkg-config, and a C compiler)
* git
* libogg (v1.3 or later)
* libpng
* libjpeg
* libcheck (v0.9.8 or later, can be skipped if you pass --disable-unit-tests to ./configure)
* libsdl2 (can by skipped if you pass --disable-player to ./configure)
* libwxgtk2.8 (optional: only needed if --enable-analyzer is passed to ./configure)

Do not use linuxbrew.

Instructions for installing these packages are OS-specific (feel free to contribute some here, especially if you tried installing these somewhere and ran into difficulties; you will likely save other people some pain). If you have a package manager that has separate -dev versions with the public headers, make sure you install those in addition to the actual libraries.

==== Mac OS X ====
Install Apple's command line developer tools. E.g. install [https://developer.apple.com/xcode/ Xcode] from the App Store and select 'Command Line Tools' from the Preferences::Downloads panel, or download and install the pkg directly from [https://developer.apple.com/downloads/ developer.apple.com].

Install [http://brew.sh/ Homebrew]

Run the following command to install dependencies:
brew install autoconf automake libtool libogg libpng libjpeg check sdl2

=== Installation Procedure ===

Just run these commands:

<syntaxhighlight lang="bash">
git clone https://git.xiph.org/daala.git
cd daala
./autogen.sh
./configure
make
</syntaxhighlight>

Note that the git clone can take several minutes to complete.

And optionally

<syntaxhighlight lang="bash">
make tools
</syntaxhighlight>

Make sure you run the git clone operation on the same machine where you intend to use the code. Checking out a copy on Windows and then trying to use it on Linux will not work, as executable permissions and line-endings will not be set properly.

{{Encoding with Daala}}

{{Decoding with Daala}}

== The Stream Analyzer ==
There is a bitstream analyzer, with a GUI based on wxWidgets available.

To run it:

./examples/analyzer video.ogv

where video.ogv is the file you want to open. If you omit it, you can open it via the analyzer's GUI.

The analyser may only work correctly with videos encoded using the same Daala version as itself, as the bitstream is still being changed regularly by the ongoing code development.

== Using PNG Images ==

To encode a series of images:

make tools
./tools/png2y4m video%05d.png -o video.y4m

where %05d means your input images are named video00000.png, video00001.png, etc. You can leave out the %05d tag if you only want to convert a single image (which does not need to be numbered).

To convert a y4m back to PNGs:

./tools/y4m2png video.y4m -o video%05d.png

If you are converting a .y4m file that only contains a single frame (e.g., from one of the still-image subsets linked above), you can leave out the %05d tag. Conversion from PNG to Y4M uses the Rec 709 matrix with video levels, a box filter for chroma subsampling, and a triangular dither. Conversion back from Y4M to PNG uses the same matrix, levels, and box filter, but does not dither.

{{Converting to y4m}}

{{Merging two y4m videos side-by-side}}

[[Category:Daala]]

Template:Merging two y4m videos side-by-side

2015-06-17T21:53:25Z