XiphWiki - User contributions [en]

OggComponent/VorbisComponent

2006-04-18T18:02:16Z

1145380866:

== Integrating Ogg into Mac OS X ==

Warning: this project is in study/design stage.

=== Introduction ===
The aim of this project is to integrate the [[Ogg]] Format and [[Vorbis]] Codec into [[Wikipedia:Mac OS X|Mac OS X]] with the end result of making the Format and Codec available for use by any of the System's sound applications.

The work consists of two main parts.
* The Audio File Format should be recognised
* The Sound should be coded/decodec.

To do such tasks, the new Core Audio API will be used.

The first part would consist of the creation of an [http://developer.apple.com/documentation/MusicAudio/Reference/CAAudioTooboxRef/AudioFileComponent/CompositePage.html AudioFileComponent]. That component has to implement the AudioFileComponentBase AudioFileFormat and AudiofileObject classes. The example on CoreAudio/AudioFile is a good starting point. It implements a rawAudio file reader/writer. The OGG part of ogg-vorbis should go here. The streaming support go here too.

The second part is the codec support. To support Vorbis, the creation of a [http://developer.apple.com/documentation/MusicAudio/Reference/CoreAudio/audiocodec/chapter_3_section_1.html#//apple_ref/doc/uid/TP30001108-CH204 AudioCodec] is needed. The example on CoreAudio/AudioCodecs is a good starting point too. It implements an IMA4 codec. No file format is implied here. So, there should be a glue ( that I haven't discovered yet ) from the AudioFileComponent API to know that contained data is Vorbis and launches the correct AudioCodec. In fact, AudioFile class contains a ReadHeader() method that allows to discover what kind of data the file contains, and then create an Audio Input Stream Format Description that determine the type of data, and codec to use.

Finally, for the rest of Ogg Codecs, just the second part is needed.

NOTE: This is not sufficient for full OS X support. Many if not most OS X applications (iTunes, for example) use [[Wikipedia:QuickTime|QuickTime]] APIs for playback and encoding of media files. Quicktime does not use the Core Audio components (yet). If we want to support those applications it will be necessary to also create two Quicktime Components. We would need a Movie Import component and a Movie Export component (codes 'eat ' and 'spit'). It has been suggested that some time in the future Quicktime will use Core Audio components if they exist, but it is not known when that will happen. In any case, the Quicktime components will still be necessary for Theora support and may even be necessary for multi-link Vorbis files as well.

Example code for building Quicktime components can be found [http://developer.apple.com/samplecode/ElectricImageComponent/ElectricImageComponent.html at Apple's Developer Connection website].

Work in progress...

=== Related Work ===
These projects were broken by the upgrade to Quicktime 7.
* [http://qtcomponents.sf.net The SourceForge Quicktime Components project]
* [http://damien.drix.free.fr/qtflac/ Quicktime components for FLAC]

=== Resources ===
* [http://www.annodex.net/software/libfishsound/ libfishsound:] A callback-based wrapper for vorbis and speex libraries. This may be a much better match to the callback-based AudioCodec API than libvorbis.
* [[Quicktime and GDB]]: Info on debugging quicktime components with GDB.
* [http://sourceforge.net/tracker/index.php?func=detail&aid=1144430&group_id=41359&atid=430388 A useful bug report] filed against qtcomponents.

=== News ===
'''Oct 3, 2005''': The QTComponent has been further updated. Get it from http://zskl.zsk.p.lodz.pl/~skali/oggvorbis.html

'''Sep 19, 2005''': It looks like somebody [http://sourceforge.net/forum/forum.php?thread_id=1353547&forum_id=135636 has fixed] the qtcomponents code enough to get ogg vorbis playback working again. However, there are still several issues, and it would still be a good idea to work on a Core Audio-based codec.

==== Old News ====
Good news! It turns out that the eat/spit components from the [http://qtcomponents.sf.net SourceForge Quicktime Components project] were '''not''' broken by the upgrade to Quicktime 7. It's just the Sound Manager-based sound decompressor component (code 'sdec') that needs to be updated to an AudioCodec. This '''greatly''' reduces the required work, since the AudioCodec API is quite simple compared to the Quicktime component API.

See [http://lists.apple.com/archives/QuickTime-API/2005/Sep/msg00126.html this message] in the quicktime-api mailing list archives for details.

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Main Page

2006-04-18T18:01:44Z

1145380866:

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.

= 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.

* [[SpeexRTP]]: RTP payload format for voice
* [[VorbisRTP]]: RTP payload format for general audio
* [[TheoraRTP]]: RTP payload format for video
* [[XSPF]]: XML playlist format

== Codecs ==

* '''Compressed Audio/Video Codecs:'''
** [[Vorbis]]: Audio codec with a [[Tremor|fixed point decoder]]
** [[Theora]]: Video codec
** [[FLAC]]: Free Lossless Audio Codec
** [[Speex]]: Speech codec
* '''Timed Text/Metadata Codecs:'''
** [[CMML]]: Continuous Media Markup Language, used for [http://www.annodex.net/ Annodex] and subtitles (xine, vlc, gstreamer, and DirectShow support)

== Software ==

* '''Software for distributing media'''
** [[Icecast]]: Streaming server
** [[Ices]]: Source client for Icecast servers

* '''Other software'''
** [[OggComponent/VorbisComponent]]: Wrappers to integrate Ogg-Vorbis into Mac OS X

== Work in Progress ==
*[[Work In Progress]]: codecs and software still in the research and development stages.

= Demonstrations of Xiph technologies =

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

* [[VorbisStreams]]: Stations streaming with the Vorbis codec
* [[Games that use Vorbis]]: Games using the Vorbis codec for music or sound effects
* [[VorbisHardware]]: Hardware players using the Vorbis codec
* [[List of Theora videos]]: Availible videos encoded with [[Theora]]

= Project management =

* [[AdminProcesses]]
* [[MonthlyMeeting]]
* [[MailingLists]]
* [[Bounties]]
* [[HyperFish]]

= Wiki internal =

* [[Sandbox]]: Testbed for testing editing skills.
* [[Translations]]: What about some translation work

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