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# pulse.c

    00001 /*
    00002 ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
    00003 ** Copyright (C) 2003-2005 M. Bakker, Ahead Software AG, http://www.nero.com
    00004 **
    00005 ** This program is free software; you can redistribute it and/or modify
    00006 ** it under the terms of the GNU General Public License as published by
    00007 ** the Free Software Foundation; either version 2 of the License, or
    00008 ** (at your option) any later version.
    00009 **
    00010 ** This program is distributed in the hope that it will be useful,
    00011 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 ** GNU General Public License for more details.
    00014 **
    00015 ** You should have received a copy of the GNU General Public License
    00016 ** along with this program; if not, write to the Free Software
    00017 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    00018 **
    00019 ** Any non-GPL usage of this software or parts of this software is strictly
    00020 ** forbidden.
    00021 **
    00022 ** Software using this code must display the following message visibly in the
    00023 ** software:
    00024 ** "FAAD2 AAC/HE-AAC/HE-AACv2/DRM decoder (c) Ahead Software, www.nero.com"
    00025 ** in, for example, the about-box or help/startup screen.
    00026 **
    00027 ** Commercial non-GPL licensing of this software is possible.
    00028 ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
    00029 **
    00030 ** $Id: pulse.c,v 1.2 2005/11/01 21:41:43 gabest Exp $
    00031 **/
    00032 #include "common.h"
    00033 #include "structs.h"
    00034
    00035 #include "syntax.h"
    00036 #include "pulse.h"
    00037
    00038 uint8_t pulse_decode(ic_stream *ics, int16_t *spec_data, uint16_t framelen)
    00039 {
    00040     uint8_t i;
    00041     uint16_t k;
    00042     pulse_info *pul = &(ics->pul);
    00043
    00044     k = ics->swb_offset[pul->pulse_start_sfb];
    00045
    00046     for (i = 0; i <= pul->number_pulse; i++)
    00047     {
    00048         k += pul->pulse_offset[i];
    00049
    00050         if (k >= framelen)
    00051             return 15; /* should not be possible */
    00052
    00053         if (spec_data[k] > 0)
    00054             spec_data[k] += pul->pulse_amp[i];
    00055         else
    00056             spec_data[k] -= pul->pulse_amp[i];
    00057     }
    00058
    00059     return 0;
    00060 }