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/* GStreamer moodbar plugin globals
* Copyright (C) 2006 Joseph Rabinoff <bobqwatson@yahoo.com>
*/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#ifndef __SPECTRUM_H__
#define __SPECTRUM_H__
/* Since fftwspectrum and fftwunspectrum are supposed to be
* opposites, they'll be using the same caps: */
#define SPECTRUM_SIGNAL_CAPS "audio/x-raw-float, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) 1, " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 32, " \
"signed = (boolean) true"
/* audio/x-spectrum-complex-float is an array of complex floats. A
* complex float is just a pair (r, i) of a real float and an
* imaginary float, each with the specified width. The properties
* are as follows:
* rate: the rate of the original signal
* size: the number of signals processed to make the current buffer
* step: the number of signals advanced after the current buffer
* width: the size of the real & imaginary parts of the data
* endianness: ditto
*
* Each audio/x-spectrum-complex-float buffer represents the Fourier
* transform of size samples, and hence _must_ have exactly
* floor(size/2) + 1 complex floats in it; in other words, its
* buffer size must be (floor(size/2) + 1) * 2 * sizeof(gfloat)
*/
#define SPECTRUM_FREQ_CAPS "audio/x-spectrum-complex-float, " \
"rate = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 32, " \
"size = (int) [ 1, MAX ], " \
"step = (int) [ 1, MAX ]"
/* Given a band number from a spectrum made from size audio
* samples at the given rate, return the frequency that band
* corresponds to.
*/
#define GST_SPECTRUM_BAND_FREQ(band, size, rate) \
(((gfloat)(band))*((gfloat)(rate))/((gfloat)(size)))
#endif /* __SPECTRUM_H__ */
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