/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.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.
** 
** This program 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 General Public License for more details.
** 
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software 
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id: pns.h,v 1.11 2003/07/29 08:20:13 menno Exp $
**/

#ifndef __PNS_H__
#define __PNS_H__

#ifdef __cplusplus
extern "C" {
#endif

#include "common.h"

#include "syntax.h"

#define NOISE_OFFSET 90
/* #define MEAN_NRG 1.537228e+18 */ /* (2^31)^2 / 3 */
#ifdef FIXED_POINT
#define ISQRT_MEAN_NRG 0x1DC7 /* sqrt(1/sqrt(MEAN_NRG)) */
#else
#define ISQRT_MEAN_NRG 8.0655e-10 /* 1/sqrt(MEAN_NRG) */
#endif


void pns_decode(ic_stream *ics_left, ic_stream *ics_right,
                real_t *spec_left, real_t *spec_right, uint16_t frame_len,
                uint8_t channel_pair);

static INLINE int32_t random2();
static void gen_rand_vector(real_t *spec, int16_t scale_factor, uint16_t size);

static INLINE uint8_t is_noise(ic_stream *ics, uint8_t group, uint8_t sfb)
{
    if (ics->sfb_cb[group][sfb] == NOISE_HCB)
        return 1;
    return 0;
}

#ifdef __cplusplus
}
#endif
#endif