2012-05-27 18:28:07 +02:00
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/* GStreamer moodbar plugin globals
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* Copyright (C) 2006 Joseph Rabinoff <bobqwatson@yahoo.com>
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*/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef __SPECTRUM_H__
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#define __SPECTRUM_H__
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/* Since fftwspectrum and fftwunspectrum are supposed to be
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* opposites, they'll be using the same caps: */
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#define SPECTRUM_SIGNAL_CAPS "audio/x-raw-float, " \
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"rate = (int) [ 1, MAX ], " \
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"channels = (int) 1, " \
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"endianness = (int) BYTE_ORDER, " \
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2012-05-27 22:39:53 +02:00
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"width = (int) 64, " \
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2012-05-27 18:28:07 +02:00
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"signed = (boolean) true"
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/* audio/x-spectrum-complex-float is an array of complex floats. A
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* complex float is just a pair (r, i) of a real float and an
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* imaginary float, each with the specified width. The properties
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* are as follows:
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* rate: the rate of the original signal
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* size: the number of signals processed to make the current buffer
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* step: the number of signals advanced after the current buffer
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* width: the size of the real & imaginary parts of the data
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* endianness: ditto
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*
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* Each audio/x-spectrum-complex-float buffer represents the Fourier
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* transform of size samples, and hence _must_ have exactly
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* floor(size/2) + 1 complex floats in it; in other words, its
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* buffer size must be (floor(size/2) + 1) * 2 * sizeof(gfloat)
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*/
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#define SPECTRUM_FREQ_CAPS "audio/x-spectrum-complex-float, " \
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"rate = (int) [ 1, MAX ], " \
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"endianness = (int) BYTE_ORDER, " \
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2012-05-27 22:39:53 +02:00
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"width = (int) 64, " \
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2012-05-27 18:28:07 +02:00
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"size = (int) [ 1, MAX ], " \
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"step = (int) [ 1, MAX ]"
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/* Given a band number from a spectrum made from size audio
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* samples at the given rate, return the frequency that band
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* corresponds to.
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*/
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#define GST_SPECTRUM_BAND_FREQ(band, size, rate) \
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(((gfloat)(band))*((gfloat)(rate))/((gfloat)(size)))
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#ifdef __cplusplus
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extern "C" {
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#endif
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void gstmoodbar_register_static();
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SPECTRUM_H__ */
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