Originally committed as revision 11732 to svn://svn.ffmpeg.org/ffmpeg/trunk

generation. Hard code Bessel I0 approximation iterations to 50.

See thread for discussion:
[FFmpeg-devel] [PATCH] Move Kaiser-Bessel Derived window to mdct.c
Started on the 2008/01/10

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Patch by Robert Swain, robert d swain a gmail d com

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4x faster than c (somehow, even though doubles only allow 2x simd).
overal flac encoding: 15-50% faster on core2, 4-11% on k8, 3-13% on p4.

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the old 32bit code)
disable mmx/sse2 optimizations as they need a rewrite now

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sum_abs_dctelem_* alone:
core2: c=186 mmx2=39 sse2=21 ssse3=13 (cycles)
k8: c=163 mmx2=33 sse2=31
p4: c=370 mmx2=60 sse2=60
 dct_sad including sum_abs_dctelem_*:
core2: c=405 mmx2=258 sse2=240 ssse3=232
k8: c=624 mmx2=394 sse2=392
p4: c=849 mmx2=556 sse2=556

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optimization/cleanup would be desirable (e.g. LE_* and LD*
should be the same on x86).

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Patch by Brian Foley % bfoley A compsoc P nuigalway P ie %
Original thread:
Date: Nov 26, 2006 6:44 PM
Subject: Re: [Ffmpeg-devel] [PATCH] put_mpeg4_qpel16_h_lowpass altivec, take 2

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and fix GPL/LGPL version mismatches.

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patch mostly by Zuxy Meng (zuxy dot meng at gmail dot com)

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patch by Michael Benjamin, neuroptik gmail com

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Update the avcodec_decode_audio and the float_to_int16 descriptions accordingly

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Existing DSPUtil functions cause chroma artifacts on some files.

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2-3% faster h264.

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15% faster vorbis.

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6% faster vorbis and wma.

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