ref: c3ec6d5ff3050628f6e2120ae9e9e7521e7c4191
parent: 3def44dfa46085e1d8ccaf9688a6817853bfcee9
author: menno <menno>
date: Wed Jan 16 03:22:10 EST 2002
Removed double file
--- a/libfaad/predict.c
+++ /dev/null
@@ -1,201 +1,0 @@
-/*
- * FAAD - Freeware Advanced Audio Decoder
- * Copyright (C) 2001 M. Bakker
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
-
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * $Id: predict.c,v 1.1 2002/01/14 19:15:57 menno Exp $
- */
-
-#include "syntax.h"
-#include "ic_predict.h"
-
-void quantize_pred_state(pred_state *state, tmp_pred_state *tmp_state)
-{- int i;
- short *s;
- unsigned long *s_tmp;
-
- s = (short*)state;
- s_tmp = (unsigned long*)tmp_state;
-
- for (i = 0; i < 6; i++)
- s[i] = (short)(s_tmp[i]>>16);
-}
-
-void inv_quantize_pred_state(pred_state *state, tmp_pred_state *tmp_state)
-{- int i;
- short *s;
- unsigned long *s_tmp;
-
-
- s_tmp = (unsigned long*)tmp_state;
- s = (short*)state;
-
- for (i = 0; i < 6; i++)
- s_tmp[i] = ((unsigned long)s[i])<<16;
-}
-
-static void flt_round_inf(float *pf)
-{- int flg;
- unsigned long tmp;
- float *pt = (float *)&tmp;
-
- *pt = *pf;
- flg = tmp & (unsigned long)0x00008000;
- tmp &= (unsigned long)0xffff0000;
- *pf = *pt;
-
- /* round 1/2 lsb toward infinity */
- if (flg)
- {- tmp &= (unsigned long)0xff800000; /* extract exponent and sign */
- tmp |= (unsigned long)0x00010000; /* insert 1 lsb */
- *pf += *pt; /* add 1 lsb and elided one */
- tmp &= (unsigned long)0xff800000; /* extract exponent and sign */
- *pf -= *pt; /* subtract elided one */
- }
-}
-
-static void ic_predict(pred_state *state, float input, float *output,
- int pred, float *mnt_table, float *exp_table)
-{- unsigned long tmp;
- int i, j;
- float dr1, predictedvalue;
- float e0, e1;
- float r0, r1;
- float k1, k2;
-
- float *r;
- float *KOR;
- float *VAR;
-
- tmp_pred_state tmp_state2;
- tmp_pred_state *tmp_state;
-
- tmp_state = &tmp_state2;
-
- /* inversely quantize the prediction state */
- inv_quantize_pred_state(state, tmp_state);
-
- r = tmp_state->r; /* delay elements */
- KOR = tmp_state->KOR; /* correlations */
- VAR = tmp_state->VAR; /* variances */
-
- r0 = r[0];
- r1 = r[1];
-
- tmp = state->VAR[0];
- j = (tmp >> 7); /* exponent */
- i = tmp & 0x7f; /* mantissa */
- k1 = KOR[1-1] * exp_table[j] * mnt_table[i];
-
- if (pred)
- {- /* only needed for the actual predicted value, k1 is always needed */
- tmp = state->VAR[1];
- j = (tmp >> 7); /* exponent */
- i = tmp & 0x7f; /* mantissa */
- k2 = KOR[2-1] * exp_table[j] * mnt_table[i];
-
- predictedvalue = k1*r0 + k2*r1;
- flt_round_inf(&predictedvalue);
-
- *output = input + predictedvalue;
- } else {- *output = input;
- }
-
- /* calculate new state data */
- e0 = *output;
- e1 = e0 - k1 * r0;
-
- dr1 = k1 * e0;
-
- VAR[0] = ALPHA * VAR[0] + (0.5f)*(r0*r0 + e0*e0);
- KOR[0] = ALPHA * KOR[0] + r0*e0;
- VAR[1] = ALPHA * VAR[1] + (0.5f)*(r1*r1 + e1*e1);
- KOR[1] = ALPHA * KOR[1] + r1*e1;
-
- r1 = A * (r0-dr1);
- r0 = A * e0;
-
- r[0] = r0;
- r[1] = r1;
-
- /* quantize the prediction state */
- quantize_pred_state(state, tmp_state);
-}
-
-static void reset_pred_state(pred_state *state)
-{- state->r[0] = 0;
- state->r[1] = 0;
- state->KOR[0] = 0;
- state->KOR[1] = 0;
- state->VAR[0] = 0x3F80;
- state->VAR[1] = 0x3F80;
-}
-
-static void reset_all_predictors(pred_state *state)
-{- int i;
-
- for (i = 0; i < 1024; i++)
- reset_pred_state(&state[i]);
-}
-
-void ic_prediction_init(pred_state *state)
-{-}
-
-/* intra channel prediction */
-void ic_prediction(ic_stream *ics, float *spec, pred_state *state,
- pred_tables *tables)
-{- int sfb, bin;
-
- if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
- {- reset_all_predictors(state);
- } else {- for (sfb = 0; sfb < ics->pred.limit; sfb++)
- {- int fc = ics->swb_offset[sfb];
- int lc = ics->swb_offset[sfb+1];
-
- for (bin = fc; bin < lc; bin++)
- {- ic_predict(&state[bin], spec[bin], &spec[bin],
- (ics->predictor_data_present &&
- ics->pred.prediction_used[sfb]), tables->mnt_table,
- tables->exp_table);
- }
- }
-
- if (ics->pred.predictor_reset)
- {- int reset_group_number = ics->pred.predictor_reset_group_number;
-
- for (bin = reset_group_number - 1; bin < 1024; bin += 30)
- {- reset_pred_state(&state[bin]);
- }
- }
- }
-}