ref: 66cf003b3e03b5431fdf4664e2d0e97cf56dfce5
parent: 920bf43d54347217b79e6825d41c7ae6a85a510b
author: rrt <rrt>
date: Sun Nov 19 16:39:07 EST 2006
Fix license, with permission from Dominic Mazzoni.
--- a/src/FFT.c
+++ b/src/FFT.c
@@ -2,30 +2,38 @@
*
* FFT.c
*
- * Based on FFT.cpp from Audacity, which contained the following text:
+ * Based on FFT.cpp from Audacity, with the following permission from
+ * its author, Dominic Mazzoni (in particular, relicensing the code
+ * for use in SoX):
*
- * This file contains a few FFT routines, including a real-FFT
- * routine that is almost twice as fast as a normal complex FFT,
- * and a power spectrum routine when you know you don't care
- * about phase information.
+ * I hereby license you under the LGPL all of the code in FFT.cpp
+ * from any version of Audacity, with the exception of the windowing
+ * function code, as I wrote the rest of the line [sic] that appears
+ * in any version of Audacity (or they are derived from Don Cross or
+ * NR, which is okay).
*
- * Some of this code was based on a free implementation of an FFT
- * by Don Cross, available on the web at:
+ * -- Dominic Mazzoni <dominic@audacityteam.org>, 18th November 2006
*
- * http://www.intersrv.com/~dcross/fft.html
+ * As regards the windowing function, WindowFunc, Dominic granted a
+ * license to it too, writing on the same day:
*
- * The basic algorithm for his code was based on Numerican Recipes
- * in Fortran. I optimized his code further by reducing array
- * accesses, caching the bit reversal table, and eliminating
- * float-to-double conversions, and I added the routines to
- * calculate a real FFT and a real power spectrum.
+ * OK, we're good. That's the original version that I wrote, before
+ * others contributed.
*
+ * Some of this code was based on a free implementation of an FFT
+ * by Don Cross, available on the web at:
+ *
+ * http://www.intersrv.com/~dcross/fft.html [no longer, it seems]
+ *
+ * The basic algorithm for his code was based on Numerical Recipes
+ * in Fortran.
+ *
* This file is now part of SoX, and is copyright Ian Turner and others.
*
* SoX is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
*
* Foobar is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -32,9 +40,10 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with SoX; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, write to the Free Software
+ * Foundation, Fifth Floor, 51 Franklin Street, Boston, MA 02111-1301,
+ * USA.
*/
#include <stdlib.h>