diff options
Diffstat (limited to 'faad2/src/libfaad/sbr_tf_grid.c')
| -rw-r--r-- | faad2/src/libfaad/sbr_tf_grid.c | 261 |
1 files changed, 261 insertions, 0 deletions
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 <stdlib.h>
+
+#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
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