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                    WAVPACK HYBRID BITRATE TEST
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The files in this folder are encoded using WavPack's hybrid mode at bitrates
ranging from 24 kbps to 1024 kbps. Decoding these files by themselves will
be lossy, and so the results will not match the md5 values stored in the
files. However, the matching correction files (.wvc) are located in the
folder "wvc_iles" and if these are moved into this folder the decoding will
be lossless and the md5 values will match. Note that some decoders may
ignore the wvc files if (as in the case of hardware decoders) it is
infeasible or problematic to handle them.

The WavPack encoder cannot automatically encode any audio file to an
arbitrary bitrate. The audio file must already have an appropriate sample
rate and number of channels to achieve the desired bitrate, given that
WavPack is most efficient encoding at about 2.5 to 5 bits per audio sample
(per channel). For these samples, the following source formats were
utilized:

   target                   source
   bitrate    <-----------  format ---------->
   (kbps)     (samplerate)  (bits)  (channels)
-------------------------------------------------------
      24        8,000 Hz      16        1
      32       11,025 Hz      16        1
      48       16,000 Hz      16        1
      64       22,050 Hz      16        1
     128       22,050 Hz      16        2
     160       32,000 Hz      16        2
     256       44,100 Hz      16        2
     320       44,100 Hz      16        2
     384       44,100 Hz      16        2
     512       48,000 Hz      24        2
    1024       96,000 Hz      24        2

Note that WavPack does not hold the target bitrate rigidly in hybrid mode,
but will instead vary from about the target bitrate to about 10% over the
value specified, depending on the material. Also, the 160 kbps sample has
significant clipping, so if this is not handled correctly in the lossy
mode it should be clearly audible.