For fixed conversion ratios (44.1->48kHz), the speex resampler is overkill. Using pre-defined tables and a polyphase implementation the CPU load can be reduced big time, or for the same load the audio quality can be increased. I uploaded the latest code of the library we've been using internally on git://github.com/plbossart/pulseaudio.git src-work (the tables are quite large and not suitable for email) The PulseAudio integration is still very preliminary and not ready for merge upstream, the detection of SSE at compile time isn't done, the filters will be updated later with better ones, but I thought I would ask for early feedback from the list. Comments and patches welcome, -Pierre Acknowledgements: Mengdong Lin, Kishore Nandury, Seppo Ingalsuo for testing and bug fixes, Michael Fu and Vijay Sankar for supporting this initiative.
