libswresample-dev 7:3.3.3-1ubuntu1 (armhf binary) in ubuntu artful

 FFmpeg is the leading multimedia framework, able to decode, encode, transcode,
 mux, demux, stream, filter and play pretty much anything that humans and
 machines have created. It supports the most obscure ancient formats up to the
 cutting edge.
 .
 This library provides performs highly optimized audio resampling, rematrixing
 and sample format conversion operations.
 Specifically, this library performs the following conversions:
  * Resampling is the process of changing the audio rate, for example from a
    high sample rate of 44100Hz to 8000Hz. Audio conversion from high to low
    sample rate is a lossy process. Several resampling options and algorithms
    are available.
  * Rematrixing is the process of changing the channel layout, for example from
    stereo to mono. When the input channels cannot be mapped to the output
    streams, the process is lossy, since it involves different gain factors
    and mixing. Various other audio conversions (e.g. stretching and padding)
    are enabled through dedicated options.
  * Format conversion is the process of converting the type of samples, for
    example from 16-bit signed samples to unsigned 8-bit or float samples.
    It also handles packing conversion, when passing from packed layout (all
    samples belonging to distinct channels interleaved in the same buffer), to
    planar layout (all samples belonging to the same channel stored in a
    dedicated buffer or "plane").
 .
 This package contains the development files.