File: psycho_n1.c

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/*
 *	TwoLAME: an optimized MPEG Audio Layer Two encoder
 *
 *	Copyright (C) 2001-2004 Michael Cheng
 *	Copyright (C) 2004-2006 The TwoLAME Project
 *
 *	This library is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU Lesser General Public
 *	License as published by the Free Software Foundation; either
 *	version 2.1 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
 *	Lesser General Public License for more details.
 *
 *	You should have received a copy of the GNU Lesser 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
 *
 *  $Id: psycho_n1.c 156 2007-03-20 23:57:35Z nhumfrey $
 *
 */

#include <stdio.h>

#include "twolame.h"
#include "common.h"
#include "psycho_n1.h"

/* this is the null psychoacoustic model 
   All it does it copy some predefined values.
   No actual modelling takes place */

/* a bunch of SNR values I sort of made up	MFC 1 oct 99 
   Found by averaging the SNR values over a sound file 
   FIXME: Do a more rigourous investigation MFC Feb 2003 */

// From Castanets.wav
static const FLOAT snrdef[32] = {
  30, 17, 16, 10, 3, 12, 8, 2.5, 5, 5, 6, 6, 5, 6, 10, 6, -4, 
  -10, -21, -30, -42, -55, -68, -75, -75, -75, -75, -75, -91, -107, -110, -108
};

#ifdef TESTSNR
// Using TMBG song "I am not your broom" about 1min. Psy Model 2
static const FLOAT snrdefa[32] = { 
  31, 17, 11,  9,  9,  7,  5,  3,  3,  3,  3,  3,  3,  1, -0, -2, 
  -5, -9,-15,-22,-32,-42,-54,-62,-63,-64,-66,-67,-83,-96,-98,-102
};

// Using Babylon5 "messages from earth: track 6" 15mins. Psy Model 2.
static const FLOAT snrdefb[32] = {
  30, 17, 11,  9,  8,  9,  6,  5,  5,  4,  4,  3,  2, -0, -2, -5, 
  -8,-13,-19,-27,-35,-46,-55,-64,-65,-66,-68,-69,-84,-97,-99,-104
};

// Using Babylon5 "messages from earth: track 6" 15mins. Psy Model 1
static const FLOAT snrdefc[32] = {
  32,  26, 22, 18, 16, 14, 12, 11, 10,	9,	9,	8,	6,	6,	4,	2,
  0, -2, -7,-12,-18,-27,-35,-47,-53,-54,-56,-57,-57,-70,  0,  0 
};
#endif

void psycho_n1(twolame_options *glopts, FLOAT ltmin[2][SBLIMIT], int stereo)
{
	int i, k;
	
	for (k = 0; k < stereo; k++)
		for (i = 0; i < SBLIMIT; i++)
			ltmin[k][i] = snrdef[i];
}

// vim:ts=4:sw=4:nowrap: