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  this will find the coefficients which minimize the sum of the squared errors,
  levinson-durbin recursion OTOH is only strictly correct if the autocorrelation matrix is a
  toeplitz matrix which it is only if the blocksize is infinite, this is also why applying
  a window (like the welch winodw we currently use) improves the lpc coefficients generated
  by levinson-durbin recursion ...

optionally (use_lpc>2) support iterative linear least abs() solver using cholesky
  factorization with adjusted weights in each iteration

compression gain for both is small, and multiple passes are of course dead slow

Originally committed as revision 5747 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 5746 to svn://svn.ffmpeg.org/ffmpeg/trunk

Removes one of the last FIXMEs from the build system.

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of gnu extensions

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patch by Víctor Paesa <wzrlpy at arsystel com>

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so recognize them as such.

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based on patch by Graham Booker <ffmpeglist at cod3r com>

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CONFIG_MINGW or __MINGW32__ instead.

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