1 files changed, 259 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libfaad/sbr_tf_grid.c b/lib/rbcodec/codecs/libfaad/sbr_tf_grid.c
new file mode 100644
index 0000000000..2c21173490
--- /dev/null
+++ b/lib/rbcodec/codecs/libfaad/sbr_tf_grid.c
@@ -0,0 +1,259 @@
+/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2004 M. Bakker, Ahead Software 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.
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
+**
+** $Id$
+**/
+
+/* 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, temp;
+    int8_t border;
+    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 = (int) (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 * (int) (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