68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/* 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) 64, " \
|
|
"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) 64, " \
|
|
"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)))
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
void gstmoodbar_register_static();
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __SPECTRUM_H__ */
|