mirror of
https://github.com/mpv-player/mpv
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32063c4339
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10726 b3059339-0415-0410-9bf9-f77b7e298cf2
358 lines
10 KiB
C
358 lines
10 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id: sbr_e_nf.c,v 1.1 2003/07/29 08:20:13 menno Exp $
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**/
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#include "common.h"
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#include "structs.h"
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#ifdef SBR_DEC
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#include <stdlib.h>
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#include "sbr_syntax.h"
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#include "sbr_e_nf.h"
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void extract_envelope_data(sbr_info *sbr, uint8_t ch)
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{
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uint8_t l, k;
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#if 0
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if (sbr->frame == 19)
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{
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sbr->frame = 19;
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}
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#endif
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for (l = 0; l < sbr->L_E[ch]; l++)
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{
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if (sbr->bs_df_env[ch][l] == 0)
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{
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for (k = 1; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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sbr->E[ch][k][l] = sbr->E[ch][k - 1][l] + sbr->E[ch][k][l];
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}
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} else { /* bs_df_env == 1 */
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uint8_t g = (l == 0) ? sbr->f_prev[ch] : sbr->f[ch][l-1];
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int16_t E_prev;
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if (sbr->f[ch][l] == g)
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{
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for (k = 0; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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if (l == 0)
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E_prev = sbr->E_prev[ch][k];
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else
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E_prev = sbr->E[ch][k][l - 1];
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sbr->E[ch][k][l] = E_prev + sbr->E[ch][k][l];
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}
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} else if ((g == 1) && (sbr->f[ch][l] == 0)) {
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uint8_t i;
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for (k = 0; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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for (i = 0; i < sbr->N_high; i++)
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{
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if (sbr->f_table_res[HI_RES][i] == sbr->f_table_res[LO_RES][k])
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{
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if (l == 0)
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E_prev = sbr->E_prev[ch][i];
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else
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E_prev = sbr->E[ch][i][l - 1];
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sbr->E[ch][k][l] = E_prev + sbr->E[ch][k][l];
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}
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}
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}
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} else if ((g == 0) && (sbr->f[ch][l] == 1)) {
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uint8_t i;
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for (k = 0; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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for (i = 0; i < sbr->N_low; i++)
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{
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if ((sbr->f_table_res[LO_RES][i] <= sbr->f_table_res[HI_RES][k]) &&
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(sbr->f_table_res[HI_RES][k] < sbr->f_table_res[LO_RES][i + 1]))
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{
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if (l == 0)
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E_prev = sbr->E_prev[ch][i];
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else
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E_prev = sbr->E[ch][i][l - 1];
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sbr->E[ch][k][l] = E_prev + sbr->E[ch][k][l];
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}
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}
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}
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}
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}
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}
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#if 0
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if (sbr->frame == 23)
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{
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int l, k;
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for (l = 0; l < sbr->L_E[ch]; l++)
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{
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for (k = 0; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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//printf("l:%d k:%d E:%d\n",l,k, sbr->E[ch][k][l]);
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printf("%d\n", sbr->E[ch][k][l]);
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}
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}
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printf("\n");
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}
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#endif
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}
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void extract_noise_floor_data(sbr_info *sbr, uint8_t ch)
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{
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uint8_t l, k;
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for (l = 0; l < sbr->L_Q[ch]; l++)
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{
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if (sbr->bs_df_noise[ch][l] == 0)
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{
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for (k = 1; k < sbr->N_Q; k++)
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{
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sbr->Q[ch][k][l] = sbr->Q[ch][k][l] + sbr->Q[ch][k-1][l];
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}
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} else {
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if (l == 0)
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{
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for (k = 0; k < sbr->N_Q; k++)
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{
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sbr->Q[ch][k][l] = sbr->Q_prev[ch][k] + sbr->Q[ch][k][0];
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}
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} else {
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for (k = 0; k < sbr->N_Q; k++)
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{
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sbr->Q[ch][k][l] = sbr->Q[ch][k][l - 1] + sbr->Q[ch][k][l];
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}
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}
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}
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}
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#if 0
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if (sbr->frame == 23)
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{
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int l, k;
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for (l = 0; l < sbr->L_Q[ch]; l++)
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{
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for (k = 0; k < sbr->N_Q; k++)
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{
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//printf("l:%d k:%d E:%d\n",l,k, sbr->E[ch][k][l]);
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printf("%d\n", sbr->Q[ch][k][l]);
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}
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}
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printf("\n");
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}
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#endif
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}
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/* FIXME: pow() not needed */
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void envelope_noise_dequantisation(sbr_info *sbr, uint8_t ch)
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{
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if (sbr->bs_coupling == 0)
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{
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uint8_t l, k;
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#ifdef FIXED_POINT
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uint8_t amp = (sbr->amp_res[ch]) ? 0 : 1;
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#else
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real_t amp = (sbr->amp_res[ch]) ? 1.0 : 0.5;
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#endif
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for (l = 0; l < sbr->L_E[ch]; l++)
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{
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for (k = 0; k < sbr->n[sbr->f[ch][l]]; k++)
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{
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#ifndef FIXED_POINT
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/* +6 for the *64 */
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sbr->E_orig[ch][k][l] = pow(2, sbr->E[ch][k][l]*amp + 6);
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#else
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int8_t exp;
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/* +6 for the *64 and -10 for the /32 in the synthesis QMF
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* since this is a energy value: (x/32)^2 = (x^2)/1024
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*/
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exp = (sbr->E[ch][k][l] >> amp) + 6 - 10;
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// printf("%d\n", exp);
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if (exp < 0)
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sbr->E_orig[ch][k][l] = 0; //REAL_CONST(1) >> -exp;
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else
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sbr->E_orig[ch][k][l] = 1 << exp; //REAL_CONST(1) << exp;
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if (amp && (sbr->E[ch][k][l] & 1))
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sbr->E_orig[ch][k][l] = MUL(sbr->E_orig[ch][k][l], REAL_CONST(1.414213562));
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#endif
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}
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}
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for (l = 0; l < sbr->L_Q[ch]; l++)
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{
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for (k = 0; k < sbr->N_Q; k++)
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{
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if (sbr->Q[ch][k][l] < 0 || sbr->Q[ch][k][l] > 30)
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sbr->Q_orig[ch][k][l] = 0;
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else {
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#ifndef FIXED_POINT
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sbr->Q_orig[ch][k][l] = pow(2, NOISE_FLOOR_OFFSET - sbr->Q[ch][k][l]);
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#else
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int8_t exp = NOISE_FLOOR_OFFSET - sbr->Q[ch][k][l];
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if (exp < 0)
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sbr->Q_orig[ch][k][l] = REAL_CONST(1) >> -exp;
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else
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sbr->Q_orig[ch][k][l] = REAL_CONST(1) << exp;
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#endif
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}
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}
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}
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}
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}
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void unmap_envelope_noise(sbr_info *sbr)
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{
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uint8_t l, k;
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#ifdef FIXED_POINT
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uint8_t amp0 = (sbr->amp_res[0]) ? 0 : 1;
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uint8_t amp1 = (sbr->amp_res[1]) ? 0 : 1;
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#else
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real_t amp0 = (sbr->amp_res[0]) ? 1.0 : 0.5;
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real_t amp1 = (sbr->amp_res[1]) ? 1.0 : 0.5;
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#endif
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for (l = 0; l < sbr->L_E[0]; l++)
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{
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for (k = 0; k < sbr->n[sbr->f[0][l]]; k++)
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{
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real_t l_temp, r_temp;
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#ifdef FIXED_POINT
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int8_t exp;
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/* +6: * 64 ; +1: * 2 ; -10: /1024 QMF */
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exp = (sbr->E[0][k][l] >> amp0) - 3;
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// printf("%d\n", exp);
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if (exp < 0)
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l_temp = REAL_CONST(1) >> -exp;
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else
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l_temp = REAL_CONST(1) << exp;
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if (amp0 && (sbr->E[0][k][l] & 1))
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l_temp = MUL(l_temp, REAL_CONST(1.414213562373095));
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/* UN_MAP removed: (x / 4096) same as (x >> 12) */
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exp = (sbr->E[1][k][l] >> amp1) - 12;
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// printf("%d\n", exp);
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if (exp < 0)
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r_temp = REAL_CONST(1) >> -exp;
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else
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r_temp = REAL_CONST(1) << exp;
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if (amp1 && (sbr->E[1][k][l] & 1))
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r_temp = MUL(r_temp, REAL_CONST(1.414213562373095));
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#else
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/* +6: * 64 ; +1: * 2 */
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l_temp = pow(2, sbr->E[0][k][l]*amp0 + 7);
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/* UN_MAP removed: (x / 4096) same as (x >> 12) */
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r_temp = pow(2, sbr->E[1][k][l]*amp1 - 12);
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#endif
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#ifdef FIXED_POINT
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{
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real_t tmp = REAL_CONST(1.0) + r_temp;
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sbr->E_orig[1][k][l] = SBR_DIV(l_temp, tmp);
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}
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#else
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sbr->E_orig[1][k][l] = l_temp / (1.0 + r_temp);
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#endif
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sbr->E_orig[0][k][l] = MUL(r_temp, sbr->E_orig[1][k][l]);
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#ifdef FIXED_POINT
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sbr->E_orig[0][k][l] >>= REAL_BITS;
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sbr->E_orig[1][k][l] >>= REAL_BITS;
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#endif
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//printf("%f\t%f\n", sbr->E_orig[0][k][l] /(float)(1<<REAL_BITS), sbr->E_orig[1][k][l] /(float)(1<<REAL_BITS));
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//printf("%f\t%f\n", sbr->E_orig[0][k][l]/1024., sbr->E_orig[1][k][l]/1024.);
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}
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}
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for (l = 0; l < sbr->L_Q[0]; l++)
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{
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for (k = 0; k < sbr->N_Q; k++)
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{
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if ((sbr->Q[0][k][l] < 0 || sbr->Q[0][k][l] > 30) ||
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(sbr->Q[1][k][l] < 0 || sbr->Q[1][k][l] > 30))
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{
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sbr->Q_orig[0][k][l] = 0;
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sbr->Q_orig[1][k][l] = 0;
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} else {
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real_t l_temp, r_temp;
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#ifndef FIXED_POINT
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l_temp = pow(2.0, NOISE_FLOOR_OFFSET - sbr->Q[0][k][l] + 1);
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r_temp = pow(2.0, sbr->Q[1][k][l] - 12);
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#else
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int8_t exp;
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exp = NOISE_FLOOR_OFFSET - sbr->Q[0][k][l] + 1;
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if (exp < 0)
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l_temp = REAL_CONST(1) >> -exp;
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else
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l_temp = REAL_CONST(1) << exp;
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exp = sbr->Q[1][k][l] - 12;
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if (exp < 0)
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r_temp = REAL_CONST(1) >> -exp;
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else
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r_temp = REAL_CONST(1) << exp;
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#endif
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#ifdef FIXED_POINT
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sbr->Q_orig[1][k][l] = SBR_DIV(l_temp, (REAL_CONST(1.0) + r_temp));
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#else
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sbr->Q_orig[1][k][l] = l_temp / (1.0 + r_temp);
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#endif
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sbr->Q_orig[0][k][l] = MUL(r_temp, sbr->Q_orig[1][k][l]);
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}
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}
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}
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}
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#endif
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