more credits to D. J. Bernstein for fft

Originally committed as revision 24308 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/arm/fft_neon.S

@@ -4,6 +4,9 @@
  * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
  * Copyright (c) 2009 Naotoshi Nojiri
  *
+ * This algorithm (though not any of the implementation details) is
+ * based on libdjbfft by D. J. Bernstein.
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

libavcodec/ppc/fft_altivec_s.S

@@ -2,6 +2,9 @@
  * FFT transform with Altivec optimizations
  * Copyright (c) 2009 Loren Merritt
  *
+ * This algorithm (though not any of the implementation details) is
+ * based on libdjbfft by D. J. Bernstein.
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

libavcodec/x86/fft_mmx.asm

@@ -2,6 +2,9 @@
 ;* FFT transform with SSE/3DNow optimizations
 ;* Copyright (c) 2008 Loren Merritt
 ;*
+;* This algorithm (though not any of the implementation details) is
+;* based on libdjbfft by D. J. Bernstein.
+;*
 ;* This file is part of FFmpeg.
 ;*
 ;* FFmpeg is free software; you can redistribute it and/or