Ogg Vorbis 1.3.3

Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel.

This places Vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance than MPEG-1/2 audio layer 3, MPEG-4 audio (TwinVQ), WMA and PAC.

Vorbis is the first of a planned family of Ogg multimedia coding formats being developed as part of Xiph.org's Ogg multimedia project.

libVorbis is the core Ogg stream / Vorbis engine.

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What's New in This Release: [ read full changelog ]

· This is a coordinated update of the audio libraries and tools to deploy improved surround-sound support across the libraries and toolchain.

libao improvements:

· AO returned to active development
· Added surround channel mapping API and capability
· Updated all drivers on modern installs
· New config file options
· Driver options may be specified in config file
· Support for MacOSX updated to 10.5 and later
· Build in WMM driver rather than using dlopen()
· Added Roar Audio driver
· Added OpenBSD SNDIO driver
· Workaround for ESD non-4096 byte write bug
· Workaround aRts server crash bug
· Workaround for VIA82xx click/crackle bugs under ALSA
· Remove dead/unused drivers (solaris, alasa05, mmsound)
· Numerous patches from multiple downstreams

libvorbis improvements:

· libVorbis 1.3.0 was briefly available as an unreleased staging snapshot. This official release bumps the version number to 1.3.1 to avoid any possible confusion.

· Optimized/coupled surround support for 5.1 encoding at 44.1/48kHz
· Added encoder control call to disable channel coupling
· Corrected an overflow bug in very low-bitrate encoding on 32 bit machines that caused inflated bitrates
· Numerous API hardening, leak and build fixes
· Correct bug in 22kHz compand setup that could cause a crash
· Correct bug in 16kHz codebooks that could cause unstable pure tones at high bitrates