mirror of https://github.com/mpv-player/mpv
364 lines
9.0 KiB
C
364 lines
9.0 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_qmf.c,v 1.5 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 <string.h>
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#include "sbr_dct.h"
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#include "sbr_qmf.h"
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#include "sbr_syntax.h"
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qmfa_info *qmfa_init(uint8_t channels)
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{
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#if 0
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int16_t n;
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#endif
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int size = 0;
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qmfa_info *qmfa = (qmfa_info*)malloc(sizeof(qmfa_info));
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qmfa->x = (real_t*)malloc(channels * 10 * sizeof(real_t));
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memset(qmfa->x, 0, channels * 10 * sizeof(real_t));
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qmfa->channels = channels;
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if (channels == 32)
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{
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#if 0
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for (n = 0; n < 32; n++)
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{
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qmfa->post_exp_re[n] = cos((M_PI/32.)*(0.75*n + 0.375));
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qmfa->post_exp_im[n] = sin((M_PI/32.)*(0.75*n + 0.375));
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}
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#endif
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} else if (channels == 64) {
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#if 0
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for (n = 0; n < 2*channels; n++)
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{
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qmfa->pre_exp_re[n] = cos(M_PI*n/(2.*channels));
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qmfa->pre_exp_im[n] = sin(M_PI*n/(2.*channels));
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}
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for (n = 0; n < 64; n++)
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{
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qmfa->post_exp_re[n] = cos(M_PI*(2*n+1)/(2.*128.));
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qmfa->post_exp_im[n] = sin(M_PI*(2*n+1)/(2.*128.));
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}
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#endif
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}
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return qmfa;
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}
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void qmfa_end(qmfa_info *qmfa)
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{
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if (qmfa)
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{
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if (qmfa->x) free(qmfa->x);
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free(qmfa);
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}
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}
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void sbr_qmf_analysis_32(qmfa_info *qmfa, const real_t *input,
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qmf_t *X, uint8_t offset)
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{
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uint8_t l;
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real_t u[64];
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#ifndef SBR_LOW_POWER
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real_t x[64], y[64];
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#else
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real_t y[32];
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#endif
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const real_t *inptr = input;
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/* qmf subsample l */
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for (l = 0; l < 32; l++)
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{
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int16_t n;
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/* shift input buffer x */
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memmove(qmfa->x + 32, qmfa->x, (320-32)*sizeof(real_t));
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/* add new samples to input buffer x */
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for (n = 32 - 1; n >= 0; n--)
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{
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#ifdef FIXED_POINT
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qmfa->x[n] = (*inptr++) >> 5;
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#else
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qmfa->x[n] = *inptr++;
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#endif
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}
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/* window and summation to create array u */
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for (n = 0; n < 64; n++)
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{
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u[n] = MUL_R_C(qmfa->x[n], qmf_c_2[n]) +
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MUL_R_C(qmfa->x[n + 64], qmf_c_2[n + 64]) +
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MUL_R_C(qmfa->x[n + 128], qmf_c_2[n + 128]) +
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MUL_R_C(qmfa->x[n + 192], qmf_c_2[n + 192]) +
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MUL_R_C(qmfa->x[n + 256], qmf_c_2[n + 256]);
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}
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/* calculate 32 subband samples by introducing X */
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#ifdef SBR_LOW_POWER
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y[0] = u[48];
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for (n = 1; n < 16; n++)
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y[n] = u[n+48] + u[48-n];
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for (n = 16; n < 32; n++)
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y[n] = -u[n-16] + u[48-n];
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DCT3_32_unscaled(u, y);
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for (n = 0; n < 32; n++)
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{
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#ifdef FIXED_POINT
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QMF_RE(X[((l + offset)<<5) + n]) = u[n] << 1;
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#else
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QMF_RE(X[((l + offset)<<5) + n]) = 2. * u[n];
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#endif
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#if 0
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if (fabs(QMF_RE(X[((l + offset)<<5) + n])) > pow(2,20))
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{
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printf("%f\n", QMF_RE(X[((l + offset)<<5) + n]));
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}
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#endif
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}
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#else
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x[0] = u[0];
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x[63] = u[32];
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for (n = 2; n < 64; n += 2)
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{
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x[n-1] = u[(n>>1)];
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x[n] = -u[64-(n>>1)];
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}
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DCT4_64(y, x);
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for (n = 0; n < 32; n++)
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{
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#ifdef FIXED_POINT
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QMF_RE(X[((l + offset)<<5) + n]) = y[n] << 1;
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QMF_IM(X[((l + offset)<<5) + n]) = -y[63-n] << 1;
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#else
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QMF_RE(X[((l + offset)<<5) + n]) = 2. * y[n];
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QMF_IM(X[((l + offset)<<5) + n]) = -2. * y[63-n];
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#endif
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#if 0
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if (fabs(QMF_RE(X[((l + offset)<<5) + n])) > pow(2,20))
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{
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printf("%f\n", QMF_RE(X[((l + offset)<<5) + n]));
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}
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if (fabs(QMF_IM(X[((l + offset)<<5) + n])) > pow(2,20))
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{
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printf("%f\n", QMF_IM(X[((l + offset)<<5) + n]));
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}
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#endif
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}
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#endif
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}
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}
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qmfs_info *qmfs_init(uint8_t channels)
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{
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int size = 0;
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qmfs_info *qmfs = (qmfs_info*)malloc(sizeof(qmfs_info));
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qmfs->v = (real_t*)malloc(channels * 20 * sizeof(real_t));
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memset(qmfs->v, 0, channels * 20 * sizeof(real_t));
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qmfs->channels = channels;
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return qmfs;
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}
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void qmfs_end(qmfs_info *qmfs)
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{
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if (qmfs)
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{
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if (qmfs->v) free(qmfs->v);
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free(qmfs);
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}
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}
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#if 0
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void sbr_qmf_synthesis_32(qmfs_info *qmfs, const complex_t *X,
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real_t *output)
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{
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uint8_t l;
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int16_t n, k;
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real_t w[320];
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complex_t x[128];
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real_t *outptr = output;
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/* qmf subsample l */
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for (l = 0; l < 32; l++)
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{
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/* shift buffer */
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for (n = 640 - 1; n >= 64; n--)
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{
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qmfs->v[n] = qmfs->v[n - 64];
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}
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/* calculate 64 samples */
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memset(x, 0, 2*64*sizeof(real_t));
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for (k = 0; k < 32; k++)
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{
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real_t er, ei, Xr, Xi;
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er = qmfs->pre_exp_re[k];
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ei = qmfs->pre_exp_im[k];
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Xr = RE(X[l * 32 + k]);
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Xi = IM(X[l * 32 + k]);
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RE(x[k]) = Xr * er - Xi * ei;
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IM(x[k]) = Xi * er + Xr * ei;
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}
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cfftb(qmfs->cffts, x);
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for (n = 0; n < 64; n++)
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{
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real_t er, ei;
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er = qmfs->post_exp_re[n];
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ei = qmfs->post_exp_im[n];
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qmfs->v[n] = RE(x[n]) * er - IM(x[n]) * ei;
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}
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for (n = 0; n < 5; n++)
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{
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for (k = 0; k < 32; k++)
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{
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w[64 * n + k] = qmfs->v[128 * n + k];
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w[64 * n + 32 + k] = qmfs->v[128 * n + 96 + k];
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}
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}
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/* window */
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for (n = 0; n < 320; n++)
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{
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w[n] *= qmf_c_2[n];
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}
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/* calculate 32 output samples */
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for (k = 0; k < 32; k++)
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{
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real_t sample = 0.0;
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for (n = 0; n < 10; n++)
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{
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sample += w[32 * n + k];
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}
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*outptr++ = sample;
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}
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}
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}
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#endif
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void sbr_qmf_synthesis_64(qmfs_info *qmfs, const qmf_t *X,
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real_t *output)
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{
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uint8_t l;
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int16_t n, k;
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#ifdef SBR_LOW_POWER
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real_t x[64];
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#else
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real_t x1[64], x2[64];
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#endif
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real_t *outptr = output;
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/* qmf subsample l */
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for (l = 0; l < 32; l++)
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{
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/* shift buffer */
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memmove(qmfs->v + 128, qmfs->v, (1280-128)*sizeof(real_t));
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/* calculate 128 samples */
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#ifdef SBR_LOW_POWER
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for (k = 0; k < 64; k++)
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{
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#ifdef FIXED_POINT
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x[k] = QMF_RE(X[(l<<6) + k]);
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#else
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x[k] = QMF_RE(X[(l<<6) + k]) / 32.;
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#endif
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}
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DCT2_64_unscaled(x, x);
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for (n = 0; n < 64; n++)
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{
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qmfs->v[n+32] = x[n];
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}
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qmfs->v[0] = qmfs->v[64];
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for (n = 1; n < 32; n++)
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{
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qmfs->v[32 - n] = qmfs->v[n + 32];
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qmfs->v[n + 96] = -qmfs->v[96 - n];
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}
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#else
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for (k = 0; k < 64; k++)
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{
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x1[k] = QMF_RE(X[(l<<6) + k])/64.;
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x2[k] = QMF_IM(X[(l<<6) + k])/64.;
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}
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DCT4_64(x1, x1);
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DST4_64(x2, x2);
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for (n = 0; n < 64; n++)
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{
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qmfs->v[n] = x2[n] - x1[n];
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qmfs->v[127-n] = x2[n] + x1[n];
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}
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#endif
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/* calculate 64 output samples and window */
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for (k = 0; k < 64; k++)
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{
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*outptr++ = MUL_R_C(qmfs->v[k], qmf_c[k]) +
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MUL_R_C(qmfs->v[192 + k], qmf_c[64 + k]) +
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MUL_R_C(qmfs->v[256 + k], qmf_c[128 + k]) +
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MUL_R_C(qmfs->v[256 + 192 + k], qmf_c[128 + 64 + k]) +
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MUL_R_C(qmfs->v[512 + k], qmf_c[256 + k]) +
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MUL_R_C(qmfs->v[512 + 192 + k], qmf_c[256 + 64 + k]) +
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MUL_R_C(qmfs->v[768 + k], qmf_c[384 + k]) +
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MUL_R_C(qmfs->v[768 + 192 + k], qmf_c[384 + 64 + k]) +
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MUL_R_C(qmfs->v[1024 + k], qmf_c[512 + k]) +
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MUL_R_C(qmfs->v[1024 + 192 + k], qmf_c[512 + 64 + k]);
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}
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}
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}
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#endif
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