1 files changed, 168 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libfaad/drc.c b/lib/rbcodec/codecs/libfaad/drc.c
new file mode 100644
index 0000000000..6e081489aa
--- /dev/null
+++ b/lib/rbcodec/codecs/libfaad/drc.c
@@ -0,0 +1,168 @@
+/*
+** 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.
+**
+** $Id$
+**/
+
+#include "common.h"
+#include "structs.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include "syntax.h"
+#include "drc.h"
+
+/* static variables */
+static drc_info s_drc_info;
+
+drc_info *drc_init(real_t cut, real_t boost)
+{
+    drc_info *drc = &s_drc_info;
+    memset(drc, 0, sizeof(drc_info));
+
+    drc->ctrl1 = cut;
+    drc->ctrl2 = boost;
+
+    drc->num_bands = 1;
+    drc->band_top[0] = 1024/4 - 1;
+    drc->dyn_rng_sgn[0] = 1;
+    drc->dyn_rng_ctl[0] = 0;
+
+    return drc;
+}
+
+#ifdef FIXED_POINT
+static real_t drc_pow2_table[] =
+{
+    COEF_CONST(0.5146511183),
+    COEF_CONST(0.5297315472),
+    COEF_CONST(0.5452538663),
+    COEF_CONST(0.5612310242),
+    COEF_CONST(0.5776763484),
+    COEF_CONST(0.5946035575),
+    COEF_CONST(0.6120267717),
+    COEF_CONST(0.6299605249),
+    COEF_CONST(0.6484197773),
+    COEF_CONST(0.6674199271),
+    COEF_CONST(0.6869768237),
+    COEF_CONST(0.7071067812),
+    COEF_CONST(0.7278265914),
+    COEF_CONST(0.7491535384),
+    COEF_CONST(0.7711054127),
+    COEF_CONST(0.7937005260),
+    COEF_CONST(0.8169577266),
+    COEF_CONST(0.8408964153),
+    COEF_CONST(0.8655365610),
+    COEF_CONST(0.8908987181),
+    COEF_CONST(0.9170040432),
+    COEF_CONST(0.9438743127),
+    COEF_CONST(0.9715319412),
+    COEF_CONST(1.0000000000),
+    COEF_CONST(1.0293022366),
+    COEF_CONST(1.0594630944),
+    COEF_CONST(1.0905077327),
+    COEF_CONST(1.1224620483),
+    COEF_CONST(1.1553526969),
+    COEF_CONST(1.1892071150),
+    COEF_CONST(1.2240535433),
+    COEF_CONST(1.2599210499),
+    COEF_CONST(1.2968395547),
+    COEF_CONST(1.3348398542),
+    COEF_CONST(1.3739536475),
+    COEF_CONST(1.4142135624),
+    COEF_CONST(1.4556531828),
+    COEF_CONST(1.4983070769),
+    COEF_CONST(1.5422108254),
+    COEF_CONST(1.5874010520),
+    COEF_CONST(1.6339154532),
+    COEF_CONST(1.6817928305),
+    COEF_CONST(1.7310731220),
+    COEF_CONST(1.7817974363),
+    COEF_CONST(1.8340080864),
+    COEF_CONST(1.8877486254),
+    COEF_CONST(1.9430638823)
+};
+#endif
+
+void drc_decode(drc_info *drc, real_t *spec)
+{
+    uint16_t i, bd, top;
+#ifdef FIXED_POINT
+    int32_t exp, frac;
+#else
+    real_t factor, exp;
+#endif
+    uint16_t bottom = 0;
+
+    if (drc->num_bands == 1)
+        drc->band_top[0] = 1024/4 - 1;
+
+    for (bd = 0; bd < drc->num_bands; bd++)
+    {
+        top = 4 * (drc->band_top[bd] + 1);
+
+#ifndef FIXED_POINT
+        /* Decode DRC gain factor */
+        if (drc->dyn_rng_sgn[bd])  /* compress */
+            exp = -drc->ctrl1 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);
+        else /* boost */
+            exp = drc->ctrl2 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);
+        factor = (real_t)pow(2.0, exp);
+
+        /* Apply gain factor */
+        for (i = bottom; i < top; i++)
+            spec[i] *= factor;
+#else
+        /* Decode DRC gain factor */
+        if (drc->dyn_rng_sgn[bd])  /* compress */
+        {
+            exp = -1 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/ 24;
+            frac = -1 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level)) % 24;
+        } else { /* boost */
+            exp = (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/ 24;
+            frac = (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level)) % 24;
+        }
+
+        /* Apply gain factor */
+        if (exp < 0)
+        {
+            for (i = bottom; i < top; i++)
+            {
+                spec[i] >>= -exp;
+                if (frac)
+                    spec[i] = MUL_R(spec[i],drc_pow2_table[frac+23]);
+            }
+        } else {
+            for (i = bottom; i < top; i++)
+            {
+                spec[i] <<= exp;
+                if (frac)
+                    spec[i] = MUL_R(spec[i],drc_pow2_table[frac+23]);
+            }
+        }
+#endif
+
+        bottom = top;
+    }
+}