From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/libfaad/sbr_tf_grid.c | 261 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 faad2/src/libfaad/sbr_tf_grid.c (limited to 'faad2/src/libfaad/sbr_tf_grid.c') diff --git a/faad2/src/libfaad/sbr_tf_grid.c b/faad2/src/libfaad/sbr_tf_grid.c new file mode 100644 index 0000000..16dbfb3 --- /dev/null +++ b/faad2/src/libfaad/sbr_tf_grid.c @@ -0,0 +1,261 @@ +/* +** 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. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: sbr_tf_grid.c,v 1.20 2008/09/19 22:50:20 menno Exp $ +**/ + +/* Time/Frequency grid */ + +#include "common.h" +#include "structs.h" + +#ifdef SBR_DEC + +#include + +#include "sbr_syntax.h" +#include "sbr_tf_grid.h" + + +/* static function declarations */ +#if 0 +static int16_t rel_bord_lead(sbr_info *sbr, uint8_t ch, uint8_t l); +static int16_t rel_bord_trail(sbr_info *sbr, uint8_t ch, uint8_t l); +#endif +static uint8_t middleBorder(sbr_info *sbr, uint8_t ch); + + +/* function constructs new time border vector */ +/* first build into temp vector to be able to use previous vector on error */ +uint8_t envelope_time_border_vector(sbr_info *sbr, uint8_t ch) +{ + uint8_t l, border, temp; + uint8_t t_E_temp[6] = {0}; + + t_E_temp[0] = sbr->rate * sbr->abs_bord_lead[ch]; + t_E_temp[sbr->L_E[ch]] = sbr->rate * sbr->abs_bord_trail[ch]; + + switch (sbr->bs_frame_class[ch]) + { + case FIXFIX: + switch (sbr->L_E[ch]) + { + case 4: + temp = (sbr->numTimeSlots / 4); + t_E_temp[3] = sbr->rate * 3 * temp; + t_E_temp[2] = sbr->rate * 2 * temp; + t_E_temp[1] = sbr->rate * temp; + break; + case 2: + t_E_temp[1] = sbr->rate * (sbr->numTimeSlots / 2); + break; + default: + break; + } + break; + + case FIXVAR: + if (sbr->L_E[ch] > 1) + { + int8_t i = sbr->L_E[ch]; + border = sbr->abs_bord_trail[ch]; + + for (l = 0; l < (sbr->L_E[ch] - 1); l++) + { + if (border < sbr->bs_rel_bord[ch][l]) + return 1; + + border -= sbr->bs_rel_bord[ch][l]; + t_E_temp[--i] = sbr->rate * border; + } + } + break; + + case VARFIX: + if (sbr->L_E[ch] > 1) + { + int8_t i = 1; + border = sbr->abs_bord_lead[ch]; + + for (l = 0; l < (sbr->L_E[ch] - 1); l++) + { + border += sbr->bs_rel_bord[ch][l]; + + if (sbr->rate * border + sbr->tHFAdj > sbr->numTimeSlotsRate+sbr->tHFGen) + return 1; + + t_E_temp[i++] = sbr->rate * border; + } + } + break; + + case VARVAR: + if (sbr->bs_num_rel_0[ch]) + { + int8_t i = 1; + border = sbr->abs_bord_lead[ch]; + + for (l = 0; l < sbr->bs_num_rel_0[ch]; l++) + { + border += sbr->bs_rel_bord_0[ch][l]; + + if (sbr->rate * border + sbr->tHFAdj > sbr->numTimeSlotsRate+sbr->tHFGen) + return 1; + + t_E_temp[i++] = sbr->rate * border; + } + } + + if (sbr->bs_num_rel_1[ch]) + { + int8_t i = sbr->L_E[ch]; + border = sbr->abs_bord_trail[ch]; + + for (l = 0; l < sbr->bs_num_rel_1[ch]; l++) + { + if (border < sbr->bs_rel_bord_1[ch][l]) + return 1; + + border -= sbr->bs_rel_bord_1[ch][l]; + t_E_temp[--i] = sbr->rate * border; + } + } + break; + } + + /* no error occured, we can safely use this t_E vector */ + for (l = 0; l < 6; l++) + { + sbr->t_E[ch][l] = t_E_temp[l]; + } + + return 0; +} + +void noise_floor_time_border_vector(sbr_info *sbr, uint8_t ch) +{ + sbr->t_Q[ch][0] = sbr->t_E[ch][0]; + + if (sbr->L_E[ch] == 1) + { + sbr->t_Q[ch][1] = sbr->t_E[ch][1]; + sbr->t_Q[ch][2] = 0; + } else { + uint8_t index = middleBorder(sbr, ch); + sbr->t_Q[ch][1] = sbr->t_E[ch][index]; + sbr->t_Q[ch][2] = sbr->t_E[ch][sbr->L_E[ch]]; + } +} + +#if 0 +static int16_t rel_bord_lead(sbr_info *sbr, uint8_t ch, uint8_t l) +{ + uint8_t i; + int16_t acc = 0; + + switch (sbr->bs_frame_class[ch]) + { + case FIXFIX: + return sbr->numTimeSlots/sbr->L_E[ch]; + case FIXVAR: + return 0; + case VARFIX: + for (i = 0; i < l; i++) + { + acc += sbr->bs_rel_bord[ch][i]; + } + return acc; + case VARVAR: + for (i = 0; i < l; i++) + { + acc += sbr->bs_rel_bord_0[ch][i]; + } + return acc; + } + + return 0; +} + +static int16_t rel_bord_trail(sbr_info *sbr, uint8_t ch, uint8_t l) +{ + uint8_t i; + int16_t acc = 0; + + switch (sbr->bs_frame_class[ch]) + { + case FIXFIX: + case VARFIX: + return 0; + case FIXVAR: + for (i = 0; i < l; i++) + { + acc += sbr->bs_rel_bord[ch][i]; + } + return acc; + case VARVAR: + for (i = 0; i < l; i++) + { + acc += sbr->bs_rel_bord_1[ch][i]; + } + return acc; + } + + return 0; +} +#endif + +static uint8_t middleBorder(sbr_info *sbr, uint8_t ch) +{ + int8_t retval = 0; + + switch (sbr->bs_frame_class[ch]) + { + case FIXFIX: + retval = sbr->L_E[ch]/2; + break; + case VARFIX: + if (sbr->bs_pointer[ch] == 0) + retval = 1; + else if (sbr->bs_pointer[ch] == 1) + retval = sbr->L_E[ch] - 1; + else + retval = sbr->bs_pointer[ch] - 1; + break; + case FIXVAR: + case VARVAR: + if (sbr->bs_pointer[ch] > 1) + retval = sbr->L_E[ch] + 1 - sbr->bs_pointer[ch]; + else + retval = sbr->L_E[ch] - 1; + break; + } + + return (retval > 0) ? retval : 0; +} + + +#endif -- cgit v1.2.3