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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.


  • 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


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