ref: e19fec5c35a674e2355a14afebd373531d3e2ef2
dir: /libfaad/pulse.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero 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.
**
** Software using this code must display the following message visibly in or
** on each copy of the software:
** "FAAD2 AAC/HE-AAC/HE-AACv2/DRM decoder (c) Nero AG, www.nero.com"
** in, for example, the about-box or help/startup screen.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: pulse.c,v 1.19 2006/05/07 18:09:01 menno Exp $
**/
#include "common.h"
#include "structs.h"
#include "syntax.h"
#include "pulse.h"
uint8_t pulse_decode(ic_stream *ics, int16_t *spec_data, uint16_t framelen)
{
uint8_t i;
uint16_t k;
pulse_info *pul = &(ics->pul);
k = min(ics->swb_offset[pul->pulse_start_sfb], ics->swb_offset_max);
for (i = 0; i <= pul->number_pulse; i++)
{
k += pul->pulse_offset[i];
if (k >= framelen)
return 15; /* should not be possible */
if (spec_data[k] > 0)
spec_data[k] += pul->pulse_amp[i];
else
spec_data[k] -= pul->pulse_amp[i];
}
return 0;
}