todo

声音文件*.spx的解压缩源代码

Features
-Add maximum/minimum bit-rate control for VBR
-Get the encoder to use the rate of packet loss (more conservative pitch gains)

Long-term quality improvements
-Improve perceptual enhancement (including wideband)

Standards
*Complete Speex RTP profile
-MIME type registration
-MS ACM wrapper

*required for 1.0

ideas:
Peelable stream (double codebook, higher bands, stereo)
LPC from spectral domain
Better psycho-acoustics? Masking curve from Vorbis