1 files changed, 267 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libfaad/ic_predict.c b/lib/rbcodec/codecs/libfaad/ic_predict.c
new file mode 100644
index 0000000000..02cadd65b1
--- /dev/null
+++ b/lib/rbcodec/codecs/libfaad/ic_predict.c
@@ -0,0 +1,267 @@
+/*
+** 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"
+
+#ifdef MAIN_DEC
+
+#include "syntax.h"
+#include "ic_predict.h"
+#include "pns.h"
+
+
+static void flt_round(float32_t *pf)
+{
+    int32_t flg;
+    uint32_t tmp, tmp1, tmp2;
+
+    tmp = *(uint32_t*)pf;
+    flg = tmp & (uint32_t)0x00008000;
+    tmp &= (uint32_t)0xffff0000;
+    tmp1 = tmp;
+    /* round 1/2 lsb toward infinity */
+    if (flg)
+    {
+        tmp &= (uint32_t)0xff800000;       /* extract exponent and sign */
+        tmp |= (uint32_t)0x00010000;       /* insert 1 lsb */
+        tmp2 = tmp;                             /* add 1 lsb and elided one */
+        tmp &= (uint32_t)0xff800000;       /* extract exponent and sign */
+        
+        *pf = *(float32_t*)&tmp1 + *(float32_t*)&tmp2 - *(float32_t*)&tmp;
+    } else {
+        *pf = *(float32_t*)&tmp;
+    }
+}
+
+static int16_t quant_pred(float32_t x)
+{
+    int16_t q;
+    uint32_t *tmp = (uint32_t*)&x;
+
+    q = (int16_t)(*tmp>>16);
+
+    return q;
+}
+
+static float32_t inv_quant_pred(int16_t q)
+{
+    float32_t x;
+    uint32_t *tmp = (uint32_t*)&x;
+    *tmp = ((uint32_t)q)<<16;
+
+    return x;
+}
+
+static void ic_predict(pred_state *state, real_t input, real_t *output, uint8_t pred)
+{
+    uint16_t tmp;
+    int16_t i, j;
+    real_t dr1, predictedvalue;
+    real_t e0, e1;
+    real_t k1, k2;
+
+    real_t r[2];
+    real_t COR[2];
+    real_t VAR[2];
+
+    r[0] = inv_quant_pred(state->r[0]);
+    r[1] = inv_quant_pred(state->r[1]);
+    COR[0] = inv_quant_pred(state->COR[0]);
+    COR[1] = inv_quant_pred(state->COR[1]);
+    VAR[0] = inv_quant_pred(state->VAR[0]);
+    VAR[1] = inv_quant_pred(state->VAR[1]);
+
+
+#if 1
+    tmp = state->VAR[0];
+    j = (tmp >> 7);
+    i = tmp & 0x7f;
+    if (j >= 128)
+    {
+        j -= 128;
+        k1 = COR[0] * exp_table[j] * mnt_table[i];
+    } else {
+        k1 = REAL_CONST(0);
+    }
+#else
+
+    {
+#define B 0.953125
+        real_t c = COR[0];
+        real_t v = VAR[0];
+        real_t tmp;
+        if (c == 0 || v <= 1)
+        {
+            k1 = 0;
+        } else {
+            tmp = B / v;
+            flt_round(&tmp);
+            k1 = c * tmp;
+        }
+    }
+#endif
+
+    if (pred)
+    {
+#if 1
+        tmp = state->VAR[1];
+        j = (tmp >> 7);
+        i = tmp & 0x7f;
+        if (j >= 128)
+        {
+            j -= 128;
+            k2 = COR[1] * exp_table[j] * mnt_table[i];
+        } else {
+            k2 = REAL_CONST(0);
+        }
+#else
+
+#define B 0.953125
+        real_t c = COR[1];
+        real_t v = VAR[1];
+        real_t tmp;
+        if (c == 0 || v <= 1)
+        {
+            k2 = 0;
+        } else {
+            tmp = B / v;
+            flt_round(&tmp);
+            k2 = c * tmp;
+        }
+#endif
+
+        predictedvalue = k1*r[0] + k2*r[1];
+        flt_round(&predictedvalue);
+        *output = input + predictedvalue;
+    }
+
+    /* calculate new state data */
+    e0 = *output;
+    e1 = e0 - k1*r[0];
+    dr1 = k1*e0;
+
+    VAR[0] = ALPHA*VAR[0] + 0.5f * (r[0]*r[0] + e0*e0);
+    COR[0] = ALPHA*COR[0] + r[0]*e0;
+    VAR[1] = ALPHA*VAR[1] + 0.5f * (r[1]*r[1] + e1*e1);
+    COR[1] = ALPHA*COR[1] + r[1]*e1;
+
+    r[1] = A * (r[0]-dr1);
+    r[0] = A * e0;
+
+    state->r[0] = quant_pred(r[0]);
+    state->r[1] = quant_pred(r[1]);
+    state->COR[0] = quant_pred(COR[0]);
+    state->COR[1] = quant_pred(COR[1]);
+    state->VAR[0] = quant_pred(VAR[0]);
+    state->VAR[1] = quant_pred(VAR[1]);
+}
+
+static void reset_pred_state(pred_state *state)
+{
+    state->r[0]   = 0;
+    state->r[1]   = 0;
+    state->COR[0] = 0;
+    state->COR[1] = 0;
+    state->VAR[0] = 0x3F80;
+    state->VAR[1] = 0x3F80;
+}
+
+void pns_reset_pred_state(ic_stream *ics, pred_state *state)
+{
+    uint8_t sfb, g, b;
+    uint16_t i, offs, offs2;
+
+    /* prediction only for long blocks */
+    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
+        return;
+
+    for (g = 0; g < ics->num_window_groups; g++)
+    {
+        for (b = 0; b < ics->window_group_length[g]; b++)
+        {
+            for (sfb = 0; sfb < ics->max_sfb; sfb++)
+            {
+                if (is_noise(ics, g, sfb))
+                {
+                    offs = ics->swb_offset[sfb];
+                    offs2 = ics->swb_offset[sfb+1];
+
+                    for (i = offs; i < offs2; i++)
+                        reset_pred_state(&state[i]);
+                }
+            }
+        }
+    }
+}
+
+void reset_all_predictors(pred_state *state, uint16_t frame_len)
+{
+    uint16_t i;
+
+    for (i = 0; i < frame_len; i++)
+        reset_pred_state(&state[i]);
+}
+
+/* intra channel prediction */
+void ic_prediction(ic_stream *ics, real_t *spec, pred_state *state,
+                   uint16_t frame_len, uint8_t sf_index)
+{
+    uint8_t sfb;
+    uint16_t bin;
+
+    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
+    {
+        reset_all_predictors(state, frame_len);
+    } else {
+        for (sfb = 0; sfb < max_pred_sfb(sf_index); sfb++)
+        {
+            uint16_t low  = ics->swb_offset[sfb];
+            uint16_t high = ics->swb_offset[sfb+1];
+
+            for (bin = low; bin < high; bin++)
+            {
+                ic_predict(&state[bin], spec[bin], &spec[bin],
+                    (ics->predictor_data_present && ics->pred.prediction_used[sfb]));
+            }
+        }
+
+        if (ics->predictor_data_present)
+        {
+            if (ics->pred.predictor_reset)
+            {
+                for (bin = ics->pred.predictor_reset_group_number - 1;
+                     bin < frame_len; bin += 30)
+                {
+                    reset_pred_state(&state[bin]);
+                }
+            }
+        }
+    }
+}
+
+#endif