mirror of
https://github.com/cookiengineer/audacity
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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* TwoLAME: an optimized MPEG Audio Layer Two encoder
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*
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* Copyright (C) 2001-2004 Michael Cheng
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* Copyright (C) 2004-2006 The TwoLAME Project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: psycho_n1.c,v 1.3 2008-02-01 19:44:35 richardash1981 Exp $
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*
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*/
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#include <stdio.h>
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#include "twolame.h"
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#include "common.h"
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#include "psycho_n1.h"
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/* this is the null psychoacoustic model
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All it does it copy some predefined values.
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No actual modelling takes place */
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/* a bunch of SNR values I sort of made up MFC 1 oct 99
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Found by averaging the SNR values over a sound file
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FIXME: Do a more rigourous investigation MFC Feb 2003 */
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// From Castanets.wav
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static const FLOAT snrdef[32] = {
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30, 17, 16, 10, 3, 12, 8, 2.5, 5, 5, 6, 6, 5, 6, 10, 6, -4,
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-10, -21, -30, -42, -55, -68, -75, -75, -75, -75, -75, -91, -107, -110, -108
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};
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#ifdef TESTSNR
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// Using TMBG song "I am not your broom" about 1min. Psy Model 2
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static const FLOAT snrdefa[32] = {
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31, 17, 11, 9, 9, 7, 5, 3, 3, 3, 3, 3, 3, 1, -0, -2,
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-5, -9,-15,-22,-32,-42,-54,-62,-63,-64,-66,-67,-83,-96,-98,-102
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};
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// Using Babylon5 "messages from earth: track 6" 15mins. Psy Model 2.
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static const FLOAT snrdefb[32] = {
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30, 17, 11, 9, 8, 9, 6, 5, 5, 4, 4, 3, 2, -0, -2, -5,
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-8,-13,-19,-27,-35,-46,-55,-64,-65,-66,-68,-69,-84,-97,-99,-104
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};
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// Using Babylon5 "messages from earth: track 6" 15mins. Psy Model 1
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static const FLOAT snrdefc[32] = {
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32, 26, 22, 18, 16, 14, 12, 11, 10, 9, 9, 8, 6, 6, 4, 2,
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0, -2, -7,-12,-18,-27,-35,-47,-53,-54,-56,-57,-57,-70, 0, 0
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};
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#endif
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void psycho_n1(twolame_options *glopts, FLOAT ltmin[2][SBLIMIT], int stereo)
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{
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int i, k;
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for (k = 0; k < stereo; k++)
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for (i = 0; i < SBLIMIT; i++)
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ltmin[k][i] = snrdef[i];
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}
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// vim:ts=4:sw=4:nowrap:
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