blob: feefe3bcb71a6a834b820b609bc746967eab96cf
| 1 | /* |
| 2 | ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding |
| 3 | ** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com |
| 4 | ** |
| 5 | ** This program is free software; you can redistribute it and/or modify |
| 6 | ** it under the terms of the GNU General Public License as published by |
| 7 | ** the Free Software Foundation; either version 2 of the License, or |
| 8 | ** (at your option) any later version. |
| 9 | ** |
| 10 | ** This program is distributed in the hope that it will be useful, |
| 11 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | ** GNU General Public License for more details. |
| 14 | ** |
| 15 | ** You should have received a copy of the GNU General Public License |
| 16 | ** along with this program; if not, write to the Free Software |
| 17 | ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | ** |
| 19 | ** Any non-GPL usage of this software or parts of this software is strictly |
| 20 | ** forbidden. |
| 21 | ** |
| 22 | ** The "appropriate copyright message" mentioned in section 2c of the GPLv2 |
| 23 | ** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" |
| 24 | ** |
| 25 | ** Commercial non-GPL licensing of this software is possible. |
| 26 | ** For more info contact Nero AG through Mpeg4AAClicense@nero.com. |
| 27 | ** |
| 28 | ** $Id: pulse.c,v 1.21 2007/11/01 12:33:34 menno Exp $ |
| 29 | **/ |
| 30 | #include "common.h" |
| 31 | #include "structs.h" |
| 32 | |
| 33 | #include "syntax.h" |
| 34 | #include "pulse.h" |
| 35 | |
| 36 | uint8_t pulse_decode(ic_stream *ics, int16_t *spec_data, uint16_t framelen) |
| 37 | { |
| 38 | uint8_t i; |
| 39 | uint16_t k; |
| 40 | pulse_info *pul = &(ics->pul); |
| 41 | |
| 42 | k = min(ics->swb_offset[pul->pulse_start_sfb], ics->swb_offset_max); |
| 43 | |
| 44 | for (i = 0; i <= pul->number_pulse; i++) { |
| 45 | k += pul->pulse_offset[i]; |
| 46 | |
| 47 | if (k >= framelen) { |
| 48 | return 15; /* should not be possible */ |
| 49 | } |
| 50 | |
| 51 | if (spec_data[k] > 0) { |
| 52 | spec_data[k] += pul->pulse_amp[i]; |
| 53 | } else { |
| 54 | spec_data[k] -= pul->pulse_amp[i]; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 |