mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* GStreamer
|
|
* Copyright (C) <2007> Sebastian Dröge <slomo@circular-chaos.org>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:gstfft
|
|
* @short_description: General FFT functions and declarations
|
|
*
|
|
* This library includes general definitions and functions, useful for
|
|
* all typed FFT classes.
|
|
*
|
|
* The gstfft library is based on
|
|
* <a href="http://sourceforge.net/projects/kissfft">kissfft</a> by
|
|
* by Mark Borgerding.
|
|
*/
|
|
|
|
#include <glib.h>
|
|
|
|
#include "gstfft.h"
|
|
#include "kiss_fft_s16.h"
|
|
|
|
/**
|
|
* gst_fft_next_fast_length:
|
|
* @n: Number for which the next fast length should be returned
|
|
*
|
|
* Returns the next number to @n that is entirely a product
|
|
* of 2, 3 and 5. Using this as the @len parameter for
|
|
* the different GstFFT types will provide the best performance.
|
|
*
|
|
* Returns: the next fast FFT length.
|
|
*
|
|
*/
|
|
gint
|
|
gst_fft_next_fast_length (gint n)
|
|
{
|
|
gint half = (n + 1) / 2;
|
|
|
|
/* It's the same for all data types so call the s16
|
|
* version */
|
|
|
|
/* The real FFT needs an even length so calculate that */
|
|
return 2 * kiss_fft_s16_next_fast_size (half);
|
|
}
|