Speex

This is a brown-paper-bag release fixing a fairly bad bug that affected the fixed-point port in 1.1.11. Architectures that use float were not affected at all. Architectures that use fixed-point had a big drop in audio quality. Only version 1.1.11 is affected.

The SSE optimizations have now been fixed and a few minor bugs in the
fixed-point and Blackfin ports have been corrected. The echo canceler
and packet loss concealment have also been improved. There are now more
information and project files for compiling Speex on TI DSPs (C5x and
C6x).

The main improvement in this release is a Blackfin
port funded by Analog Devices. This includes
Blackfin assembly optimizations that reduce CPU
time by a factor of two. Also, the packet loss
concealment code has now been converted to
fixed-point.

The main change in this release is the echo canceller work. It is
now possible to perform acoustic echo cancellation and obtain
good attenuation after a short adaptation time. This has been
tested at 8 kHz, but it should also work at 16 khz and above.
There were also some fixes to the fixed-point, especially for
the TI C5x DSP family.

This release contains an initial TI C5x port, along with some fixed-point improvements and fixes, and better temporary memory allocation (smaller). The size of integer types is now detected automatically. A new SPEEX_PLC_TUNING option has been implemented to make Speex more robust to packet loss.