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    • Lynne's avatar
      lavu/tx: implement 32 bit fixed point FFT and MDCT · e8f054b0
      Lynne authored
      Required minimal changes to the code so made sense to implement.
      FFT and MDCT tested, the output of both was properly rounded.
      Fun fact: the non-power-of-two fixed-point FFT and MDCT are the fastest ever
      non-power-of-two fixed-point FFT and MDCT written.
      This can replace the power of two integer MDCTs in aac and ac3 if the
      MIPS optimizations are ported across.
      Unfortunately the ac3 encoder uses a 16-bit fixed point forward transform,
      unlike the encoder which uses a 32bit inverse transform, so some modifications
      might be required there.
      
      The 3-point FFT is somewhat less accurate than it otherwise could be,
      having minor rounding errors with bigger transforms. However, this
      could be improved later, and the way its currently written is the way one
      would write assembly for it.
      Similar rounding errors can also be found throughout the power of two FFTs
      as well, though those are more difficult to correct.
      Despite this, the integer transforms are more than accurate enough.
      e8f054b0
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