1. 14 Mar, 2011 1 commit
    • Justin's avatar
      ac3enc: do not right-shift fixed-point coefficients in the final MDCT stage. · 323e6fea
      Justin authored
      This increases the accuracy of coefficients, leading to improved quality.
      Rescaling of the coefficients to full 25-bit accuracy is done rather than
      offsetting the exponent values. This requires coefficient scaling to be done
      before determining the rematrixing strategy. Also, the rematrixing strategy
      calculation must use 64-bit math to prevent overflow due to the higher
      precision coefficients.
      323e6fea
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  17. 29 Dec, 2010 1 commit
    • Justin Ruggles's avatar
      Change the default dB-per-bit code from 2 to 3. · ec44dd5f
      Justin Ruggles authored
      This gives slightly better quality in PEAQ tests.
      Code 3 gives a dBpb value of 2816 = -132dB (128 psd units = -6dB), which
      corresponds to 22 bits. Since the exponents have an offset applied, the
      16-bit source looks like 24-bit source to the bit allocation routine.
      So using dBpb code=3 is a closer match to the exponent range.
      
      Regression test refs updated for acodec-ac3, lavf-rm, and seek-ac3_rm.
      
      Originally committed as revision 26144 to svn://svn.ffmpeg.org/ffmpeg/trunk
      ec44dd5f
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