mirror of https://git.ffmpeg.org/ffmpeg.git
586 lines
22 KiB
C
586 lines
22 KiB
C
/*
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* Copyright (c) 2013
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* AAC Spectral Band Replication decoding functions (fixed-point)
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* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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* Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AAC Spectral Band Replication decoding functions (fixed-point)
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* Note: Rounding-to-nearest used unless otherwise stated
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* @author Robert Swain ( rob opendot cl )
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* @author Stanislav Ocovaj ( stanislav.ocovaj imgtec com )
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*/
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#define USE_FIXED 1
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#include "aac.h"
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#include "sbr.h"
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#include "aacsbr.h"
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#include "aacsbrdata.h"
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#include "aacsbr_fixed_tablegen.h"
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#include "fft.h"
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#include "aacps.h"
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#include "sbrdsp.h"
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#include "libavutil/internal.h"
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#include "libavutil/libm.h"
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#include "libavutil/avassert.h"
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#include <stdint.h>
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#include <float.h>
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#include <math.h>
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static VLC vlc_sbr[10];
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static void aacsbr_func_ptr_init(AACSBRContext *c);
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static const int CONST_LN2 = Q31(0.6931471806/256); // ln(2)/256
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static const int CONST_RECIP_LN2 = Q31(0.7213475204); // 0.5/ln(2)
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static const int CONST_076923 = Q31(0.76923076923076923077f);
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static const int fixed_log_table[10] =
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{
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Q31(1.0/2), Q31(1.0/3), Q31(1.0/4), Q31(1.0/5), Q31(1.0/6),
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Q31(1.0/7), Q31(1.0/8), Q31(1.0/9), Q31(1.0/10), Q31(1.0/11)
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};
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static int fixed_log(int x)
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{
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int i, ret, xpow, tmp;
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ret = x;
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xpow = x;
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for (i=0; i<10; i+=2){
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xpow = (int)(((int64_t)xpow * x + 0x40000000) >> 31);
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tmp = (int)(((int64_t)xpow * fixed_log_table[i] + 0x40000000) >> 31);
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ret -= tmp;
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xpow = (int)(((int64_t)xpow * x + 0x40000000) >> 31);
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tmp = (int)(((int64_t)xpow * fixed_log_table[i+1] + 0x40000000) >> 31);
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ret += tmp;
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}
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return ret;
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}
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static const int fixed_exp_table[7] =
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{
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Q31(1.0/2), Q31(1.0/6), Q31(1.0/24), Q31(1.0/120),
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Q31(1.0/720), Q31(1.0/5040), Q31(1.0/40320)
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};
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static int fixed_exp(int x)
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{
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int i, ret, xpow, tmp;
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ret = 0x800000 + x;
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xpow = x;
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for (i=0; i<7; i++){
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xpow = (int)(((int64_t)xpow * x + 0x400000) >> 23);
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tmp = (int)(((int64_t)xpow * fixed_exp_table[i] + 0x40000000) >> 31);
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ret += tmp;
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}
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return ret;
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}
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static void make_bands(int16_t* bands, int start, int stop, int num_bands)
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{
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int k, previous, present;
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int base, prod, nz = 0;
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base = (stop << 23) / start;
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while (base < 0x40000000){
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base <<= 1;
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nz++;
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}
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base = fixed_log(base - 0x80000000);
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base = (((base + 0x80) >> 8) + (8-nz)*CONST_LN2) / num_bands;
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base = fixed_exp(base);
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previous = start;
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prod = start << 23;
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for (k = 0; k < num_bands-1; k++) {
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prod = (int)(((int64_t)prod * base + 0x400000) >> 23);
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present = (prod + 0x400000) >> 23;
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bands[k] = present - previous;
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previous = present;
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}
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bands[num_bands-1] = stop - previous;
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}
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/// Dequantization and stereo decoding (14496-3 sp04 p203)
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static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
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{
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int k, e;
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int ch;
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if (id_aac == TYPE_CPE && sbr->bs_coupling) {
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int alpha = sbr->data[0].bs_amp_res ? 2 : 1;
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int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24;
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for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
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for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
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SoftFloat temp1, temp2, fac;
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temp1.exp = sbr->data[0].env_facs[e][k].mant * alpha + 14;
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if (temp1.exp & 1)
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temp1.mant = 759250125;
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else
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temp1.mant = 0x20000000;
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temp1.exp = (temp1.exp >> 1) + 1;
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temp2.exp = (pan_offset - sbr->data[1].env_facs[e][k].mant) * alpha;
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if (temp2.exp & 1)
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temp2.mant = 759250125;
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else
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temp2.mant = 0x20000000;
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temp2.exp = (temp2.exp >> 1) + 1;
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fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2));
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sbr->data[0].env_facs[e][k] = fac;
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sbr->data[1].env_facs[e][k] = av_mul_sf(fac, temp2);
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}
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}
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for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
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for (k = 0; k < sbr->n_q; k++) {
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SoftFloat temp1, temp2, fac;
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temp1.exp = NOISE_FLOOR_OFFSET - \
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sbr->data[0].noise_facs[e][k].mant + 2;
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temp1.mant = 0x20000000;
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temp2.exp = 12 - sbr->data[1].noise_facs[e][k].mant + 1;
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temp2.mant = 0x20000000;
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fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2));
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sbr->data[0].noise_facs[e][k] = fac;
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sbr->data[1].noise_facs[e][k] = av_mul_sf(fac, temp2);
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}
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}
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} else { // SCE or one non-coupled CPE
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for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
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int alpha = sbr->data[ch].bs_amp_res ? 2 : 1;
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for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
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for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
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SoftFloat temp1;
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temp1.exp = alpha * sbr->data[ch].env_facs[e][k].mant + 12;
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if (temp1.exp & 1)
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temp1.mant = 759250125;
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else
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temp1.mant = 0x20000000;
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temp1.exp = (temp1.exp >> 1) + 1;
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sbr->data[ch].env_facs[e][k] = temp1;
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}
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for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
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for (k = 0; k < sbr->n_q; k++){
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sbr->data[ch].noise_facs[e][k].exp = NOISE_FLOOR_OFFSET - \
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sbr->data[ch].noise_facs[e][k].mant + 1;
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sbr->data[ch].noise_facs[e][k].mant = 0x20000000;
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}
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}
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}
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}
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/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
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* (14496-3 sp04 p214)
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* Warning: This routine does not seem numerically stable.
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*/
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static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
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int (*alpha0)[2], int (*alpha1)[2],
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const int X_low[32][40][2], int k0)
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{
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int k;
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int shift, round;
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for (k = 0; k < k0; k++) {
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SoftFloat phi[3][2][2];
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SoftFloat a00, a01, a10, a11;
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SoftFloat dk;
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dsp->autocorrelate(X_low[k], phi);
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dk = av_sub_sf(av_mul_sf(phi[2][1][0], phi[1][0][0]),
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av_mul_sf(av_add_sf(av_mul_sf(phi[1][1][0], phi[1][1][0]),
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av_mul_sf(phi[1][1][1], phi[1][1][1])), FLOAT_0999999));
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if (!dk.mant) {
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a10 = FLOAT_0;
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a11 = FLOAT_0;
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} else {
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SoftFloat temp_real, temp_im;
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temp_real = av_sub_sf(av_sub_sf(av_mul_sf(phi[0][0][0], phi[1][1][0]),
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av_mul_sf(phi[0][0][1], phi[1][1][1])),
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av_mul_sf(phi[0][1][0], phi[1][0][0]));
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temp_im = av_sub_sf(av_add_sf(av_mul_sf(phi[0][0][0], phi[1][1][1]),
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av_mul_sf(phi[0][0][1], phi[1][1][0])),
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av_mul_sf(phi[0][1][1], phi[1][0][0]));
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a10 = av_div_sf(temp_real, dk);
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a11 = av_div_sf(temp_im, dk);
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}
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if (!phi[1][0][0].mant) {
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a00 = FLOAT_0;
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a01 = FLOAT_0;
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} else {
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SoftFloat temp_real, temp_im;
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temp_real = av_add_sf(phi[0][0][0],
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av_add_sf(av_mul_sf(a10, phi[1][1][0]),
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av_mul_sf(a11, phi[1][1][1])));
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temp_im = av_add_sf(phi[0][0][1],
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av_sub_sf(av_mul_sf(a11, phi[1][1][0]),
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av_mul_sf(a10, phi[1][1][1])));
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temp_real.mant = -temp_real.mant;
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temp_im.mant = -temp_im.mant;
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a00 = av_div_sf(temp_real, phi[1][0][0]);
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a01 = av_div_sf(temp_im, phi[1][0][0]);
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}
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shift = a00.exp;
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if (shift >= 3)
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alpha0[k][0] = 0x7fffffff;
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else {
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a00.mant <<= 1;
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shift = 2-shift;
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if (shift == 0)
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alpha0[k][0] = a00.mant;
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else {
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round = 1 << (shift-1);
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alpha0[k][0] = (a00.mant + round) >> shift;
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}
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}
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shift = a01.exp;
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if (shift >= 3)
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alpha0[k][1] = 0x7fffffff;
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else {
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a01.mant <<= 1;
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shift = 2-shift;
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if (shift == 0)
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alpha0[k][1] = a01.mant;
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else {
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round = 1 << (shift-1);
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alpha0[k][1] = (a01.mant + round) >> shift;
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}
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}
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shift = a10.exp;
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if (shift >= 3)
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alpha1[k][0] = 0x7fffffff;
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else {
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a10.mant <<= 1;
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shift = 2-shift;
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if (shift == 0)
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alpha1[k][0] = a10.mant;
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else {
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round = 1 << (shift-1);
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alpha1[k][0] = (a10.mant + round) >> shift;
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}
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}
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shift = a11.exp;
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if (shift >= 3)
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alpha1[k][1] = 0x7fffffff;
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else {
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a11.mant <<= 1;
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shift = 2-shift;
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if (shift == 0)
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alpha1[k][1] = a11.mant;
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else {
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round = 1 << (shift-1);
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alpha1[k][1] = (a11.mant + round) >> shift;
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}
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}
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shift = (int)(((int64_t)(alpha1[k][0]>>1) * (alpha1[k][0]>>1) + \
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(int64_t)(alpha1[k][1]>>1) * (alpha1[k][1]>>1) + \
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0x40000000) >> 31);
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if (shift >= 0x20000000){
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alpha1[k][0] = 0;
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alpha1[k][1] = 0;
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alpha0[k][0] = 0;
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alpha0[k][1] = 0;
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}
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shift = (int)(((int64_t)(alpha0[k][0]>>1) * (alpha0[k][0]>>1) + \
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(int64_t)(alpha0[k][1]>>1) * (alpha0[k][1]>>1) + \
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0x40000000) >> 31);
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if (shift >= 0x20000000){
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alpha1[k][0] = 0;
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alpha1[k][1] = 0;
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alpha0[k][0] = 0;
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alpha0[k][1] = 0;
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}
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}
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}
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/// Chirp Factors (14496-3 sp04 p214)
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static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
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{
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int i;
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int new_bw;
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static const int bw_tab[] = { 0, 1610612736, 1932735283, 2104533975 };
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int64_t accu;
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for (i = 0; i < sbr->n_q; i++) {
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if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1)
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new_bw = 1288490189;
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else
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new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
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if (new_bw < ch_data->bw_array[i]){
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accu = (int64_t)new_bw * 1610612736;
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accu += (int64_t)ch_data->bw_array[i] * 0x20000000;
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new_bw = (int)((accu + 0x40000000) >> 31);
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} else {
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accu = (int64_t)new_bw * 1946157056;
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accu += (int64_t)ch_data->bw_array[i] * 201326592;
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new_bw = (int)((accu + 0x40000000) >> 31);
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}
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ch_data->bw_array[i] = new_bw < 0x2000000 ? 0 : new_bw;
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}
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}
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/**
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* Calculation of levels of additional HF signal components (14496-3 sp04 p219)
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* and Calculation of gain (14496-3 sp04 p219)
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*/
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static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
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SBRData *ch_data, const int e_a[2])
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{
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int e, k, m;
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// max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
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static const SoftFloat limgain[4] = { { 760155524, 0 }, { 0x20000000, 1 },
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{ 758351638, 1 }, { 625000000, 34 } };
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for (e = 0; e < ch_data->bs_num_env; e++) {
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int delta = !((e == e_a[1]) || (e == e_a[0]));
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for (k = 0; k < sbr->n_lim; k++) {
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SoftFloat gain_boost, gain_max;
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SoftFloat sum[2] = { { 0, 0}, { 0, 0 } };
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for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
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const SoftFloat temp = av_div_sf(sbr->e_origmapped[e][m],
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av_add_sf(FLOAT_1, sbr->q_mapped[e][m]));
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sbr->q_m[e][m] = av_sqrt_sf(av_mul_sf(temp, sbr->q_mapped[e][m]));
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sbr->s_m[e][m] = av_sqrt_sf(av_mul_sf(temp, av_int2sf(ch_data->s_indexmapped[e + 1][m], 0)));
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if (!sbr->s_mapped[e][m]) {
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if (delta) {
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sbr->gain[e][m] = av_sqrt_sf(av_div_sf(sbr->e_origmapped[e][m],
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av_mul_sf(av_add_sf(FLOAT_1, sbr->e_curr[e][m]),
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av_add_sf(FLOAT_1, sbr->q_mapped[e][m]))));
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} else {
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sbr->gain[e][m] = av_sqrt_sf(av_div_sf(sbr->e_origmapped[e][m],
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av_add_sf(FLOAT_1, sbr->e_curr[e][m])));
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}
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} else {
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sbr->gain[e][m] = av_sqrt_sf(
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av_div_sf(
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av_mul_sf(sbr->e_origmapped[e][m], sbr->q_mapped[e][m]),
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av_mul_sf(
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av_add_sf(FLOAT_1, sbr->e_curr[e][m]),
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av_add_sf(FLOAT_1, sbr->q_mapped[e][m]))));
|
|
}
|
|
}
|
|
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
|
|
sum[0] = av_add_sf(sum[0], sbr->e_origmapped[e][m]);
|
|
sum[1] = av_add_sf(sum[1], sbr->e_curr[e][m]);
|
|
}
|
|
gain_max = av_mul_sf(limgain[sbr->bs_limiter_gains],
|
|
av_sqrt_sf(
|
|
av_div_sf(
|
|
av_add_sf(FLOAT_EPSILON, sum[0]),
|
|
av_add_sf(FLOAT_EPSILON, sum[1]))));
|
|
if (av_gt_sf(gain_max, FLOAT_100000))
|
|
gain_max = FLOAT_100000;
|
|
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
|
|
SoftFloat q_m_max = av_div_sf(
|
|
av_mul_sf(sbr->q_m[e][m], gain_max),
|
|
sbr->gain[e][m]);
|
|
if (av_gt_sf(sbr->q_m[e][m], q_m_max))
|
|
sbr->q_m[e][m] = q_m_max;
|
|
if (av_gt_sf(sbr->gain[e][m], gain_max))
|
|
sbr->gain[e][m] = gain_max;
|
|
}
|
|
sum[0] = sum[1] = FLOAT_0;
|
|
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
|
|
sum[0] = av_add_sf(sum[0], sbr->e_origmapped[e][m]);
|
|
sum[1] = av_add_sf(sum[1],
|
|
av_mul_sf(
|
|
av_mul_sf(sbr->e_curr[e][m],
|
|
sbr->gain[e][m]),
|
|
sbr->gain[e][m]));
|
|
sum[1] = av_add_sf(sum[1],
|
|
av_mul_sf(sbr->s_m[e][m], sbr->s_m[e][m]));
|
|
if (delta && !sbr->s_m[e][m].mant)
|
|
sum[1] = av_add_sf(sum[1],
|
|
av_mul_sf(sbr->q_m[e][m], sbr->q_m[e][m]));
|
|
}
|
|
gain_boost = av_sqrt_sf(
|
|
av_div_sf(
|
|
av_add_sf(FLOAT_EPSILON, sum[0]),
|
|
av_add_sf(FLOAT_EPSILON, sum[1])));
|
|
if (av_gt_sf(gain_boost, FLOAT_1584893192))
|
|
gain_boost = FLOAT_1584893192;
|
|
|
|
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
|
|
sbr->gain[e][m] = av_mul_sf(sbr->gain[e][m], gain_boost);
|
|
sbr->q_m[e][m] = av_mul_sf(sbr->q_m[e][m], gain_boost);
|
|
sbr->s_m[e][m] = av_mul_sf(sbr->s_m[e][m], gain_boost);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Assembling HF Signals (14496-3 sp04 p220)
|
|
static void sbr_hf_assemble(int Y1[38][64][2],
|
|
const int X_high[64][40][2],
|
|
SpectralBandReplication *sbr, SBRData *ch_data,
|
|
const int e_a[2])
|
|
{
|
|
int e, i, j, m;
|
|
const int h_SL = 4 * !sbr->bs_smoothing_mode;
|
|
const int kx = sbr->kx[1];
|
|
const int m_max = sbr->m[1];
|
|
static const SoftFloat h_smooth[5] = {
|
|
{ 715827883, -1 },
|
|
{ 647472402, -1 },
|
|
{ 937030863, -2 },
|
|
{ 989249804, -3 },
|
|
{ 546843842, -4 },
|
|
};
|
|
SoftFloat (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
|
|
int indexnoise = ch_data->f_indexnoise;
|
|
int indexsine = ch_data->f_indexsine;
|
|
|
|
if (sbr->reset) {
|
|
for (i = 0; i < h_SL; i++) {
|
|
memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
|
|
memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
|
|
}
|
|
} else if (h_SL) {
|
|
for (i = 0; i < 4; i++) {
|
|
memcpy(g_temp[i + 2 * ch_data->t_env[0]],
|
|
g_temp[i + 2 * ch_data->t_env_num_env_old],
|
|
sizeof(g_temp[0]));
|
|
memcpy(q_temp[i + 2 * ch_data->t_env[0]],
|
|
q_temp[i + 2 * ch_data->t_env_num_env_old],
|
|
sizeof(q_temp[0]));
|
|
}
|
|
}
|
|
|
|
for (e = 0; e < ch_data->bs_num_env; e++) {
|
|
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
|
|
memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
|
|
memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
|
|
}
|
|
}
|
|
|
|
for (e = 0; e < ch_data->bs_num_env; e++) {
|
|
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
|
|
SoftFloat g_filt_tab[48];
|
|
SoftFloat q_filt_tab[48];
|
|
SoftFloat *g_filt, *q_filt;
|
|
|
|
if (h_SL && e != e_a[0] && e != e_a[1]) {
|
|
g_filt = g_filt_tab;
|
|
q_filt = q_filt_tab;
|
|
for (m = 0; m < m_max; m++) {
|
|
const int idx1 = i + h_SL;
|
|
g_filt[m].mant = g_filt[m].exp = 0;
|
|
q_filt[m].mant = q_filt[m].exp = 0;
|
|
for (j = 0; j <= h_SL; j++) {
|
|
g_filt[m] = av_add_sf(g_filt[m],
|
|
av_mul_sf(g_temp[idx1 - j][m],
|
|
h_smooth[j]));
|
|
q_filt[m] = av_add_sf(q_filt[m],
|
|
av_mul_sf(q_temp[idx1 - j][m],
|
|
h_smooth[j]));
|
|
}
|
|
}
|
|
} else {
|
|
g_filt = g_temp[i + h_SL];
|
|
q_filt = q_temp[i];
|
|
}
|
|
|
|
sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
|
|
i + ENVELOPE_ADJUSTMENT_OFFSET);
|
|
|
|
if (e != e_a[0] && e != e_a[1]) {
|
|
sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
|
|
q_filt, indexnoise,
|
|
kx, m_max);
|
|
} else {
|
|
int idx = indexsine&1;
|
|
int A = (1-((indexsine+(kx & 1))&2));
|
|
int B = (A^(-idx)) + idx;
|
|
int *out = &Y1[i][kx][idx];
|
|
int shift, round;
|
|
|
|
SoftFloat *in = sbr->s_m[e];
|
|
for (m = 0; m+1 < m_max; m+=2) {
|
|
shift = 22 - in[m ].exp;
|
|
round = 1 << (shift-1);
|
|
out[2*m ] += (in[m ].mant * A + round) >> shift;
|
|
|
|
shift = 22 - in[m+1].exp;
|
|
round = 1 << (shift-1);
|
|
out[2*m+2] += (in[m+1].mant * B + round) >> shift;
|
|
}
|
|
if(m_max&1)
|
|
{
|
|
shift = 22 - in[m ].exp;
|
|
round = 1 << (shift-1);
|
|
|
|
out[2*m ] += (in[m ].mant * A + round) >> shift;
|
|
}
|
|
}
|
|
indexnoise = (indexnoise + m_max) & 0x1ff;
|
|
indexsine = (indexsine + 1) & 3;
|
|
}
|
|
}
|
|
ch_data->f_indexnoise = indexnoise;
|
|
ch_data->f_indexsine = indexsine;
|
|
}
|
|
|
|
#include "aacsbr_template.c"
|