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Speex: a free codec for free speech

Downloads

The latest development versions of Speex and SpeexDSP are always available through Git at http://git.xiph.org/speex.git and http://git.xiph.org/speexdsp.git, respectively. Note that packaging information for Debian can be found on the packages page. In addition, RareWares maintains useful Windows utilities such as SpeexDrop.

Current Unstable Release (recommended)

1.2rc2

This release splits the speex codec library and the speex DSP library into separate source trees. Both projects received build-system improvements, bugfixes, and cleanup. The speex codec's VBR tuning was improved, while the speexdsp resampler got some NEON optimizations.

Downloads:

1.2rc1

This release adds support for acoustic echo cancellation with multiple microphones and multiple loudspeakers. It also adds an API to decorrelate loudspeaker signals to improve multi-channel performance. In the bugfix department, there are fixes for a few bugs in the echo canceller, jitter buffer and preprocessor. At this point, the API for 1.2 should be stable and only a few very minor additions are planned.

Downloads:

1.2beta3

The most obvious change in this release is that all the non-codec components (preprocessor, echo cancellation, jitter buffer) have been moved to a new libspeexdsp library. Other changes include a new jitter buffer algorithm and resampler improvements/fixes. This is also the first release where libspeex can be built without any floating point support. To do this, the float compatibility API must be disabled (--disable-float-api or DISABLE_FLOAT_API) and the VBR feature must be disabled (--disable-vbr or DISABLE_VBR).

Downloads:

1.2beta2

Again, this new releases brings many improvements. The RAM requirement for wideband has gone down drastically (i.e. more than 2x). A new resampler module has been added, providing arbitrary sampling rate conversion -- fast. The echo canceller has also been improved. A bug in 1.2beta1 that made the echo canceller unstable has been fixed. The echo canceller should now converge faster, be robust and tolerant of incorrect capture-playback synchronisation. The preprocessor has also been greatly improved. Not only should the quality be better, but it is now fully converted to fixed-point. At last, early TriMedia support (incomplete) has been merged.

Downloads:

Current Stable Release (old, not recommended)

1.0.5

The main change with this release is that it includes API additions from the 1.1.x branch (while being backward compatible), so that transition from 1.0.x to 1.1.x can be made easier.

DirectShow Filters

If you just want to listen to Speex files in Windows Media Player, get Xiph.Org's DirectShow Filters for Speex.