The SoX Resampler library `libsoxr' performs one-dimensional sample-rate conversion -- it may be used, for example, to resample PCM-encoded audio. For higher-dimensional resampling, such as for visual-image processing, you should look elsewhere. It aims to give fast and very high quality results for any constant (rational or irrational) resampling ratio. Phase-response, preserved bandwidth, aliasing, and rejection level parameters are all configurable; alternatively, simple `preset' configurations may be selected. An experimental, variable-rate resampling mode of operation is also included.
WWW: http://sourceforge.net/p/soxr/wiki/Home/
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