Opus-1.1-alpha

This is an alpha release for the upcoming 1.1 release. Compared to 1.0.2, it includes quality improvements, optimizations, bug fixes, as well as an experimental speech/music detector for mode decisions. All the fixes and improvements from 1.0.2 are also in this release.

Quality

• Unconstrained VBR algorithm
• New transient detector
• Bitrate boost for tonal samples, which are harder to code
• Fixes to the tf analysis code
• Improvements to the hybrid mode code
• Fixed some mode switching issues
• More aggressive use of dynamic allocation
• Automatic audio bandwidth detection
• DC rejection filter

Optimizations

• Significant reduction of the decoder stack size requirement
• Optimization of several functions for the common case of zero