mirror of
https://github.com/FFmpeg/FFmpeg.git
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292 lines
8.5 KiB
C
292 lines
8.5 KiB
C
/*
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* AAC Spectral Band Replication decoding functions
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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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* Note: Rounding-to-nearest used unless otherwise stated
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*
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*/
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#define USE_FIXED 1
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#include "aac.h"
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/intfloat.h"
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#include "sbrdsp.h"
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static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
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{
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SoftFloat ret;
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int64_t accu = 0;
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int i, nz, round;
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for (i = 0; i < n; i += 2) {
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// Larger values are inavlid and could cause overflows of accu.
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av_assert2(FFABS(x[i + 0][0]) >> 29 == 0);
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accu += (int64_t)x[i + 0][0] * x[i + 0][0];
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av_assert2(FFABS(x[i + 0][1]) >> 29 == 0);
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accu += (int64_t)x[i + 0][1] * x[i + 0][1];
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av_assert2(FFABS(x[i + 1][0]) >> 29 == 0);
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accu += (int64_t)x[i + 1][0] * x[i + 1][0];
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av_assert2(FFABS(x[i + 1][1]) >> 29 == 0);
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accu += (int64_t)x[i + 1][1] * x[i + 1][1];
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}
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i = (int)(accu >> 32);
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if (i == 0) {
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nz = 1;
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} else {
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nz = 0;
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while (FFABS(i) < 0x40000000) {
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i <<= 1;
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nz++;
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}
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nz = 32 - nz;
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}
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round = 1 << (nz-1);
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i = (int)((accu + round) >> nz);
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i >>= 1;
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ret = av_int2sf(i, 15 - nz);
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return ret;
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}
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static void sbr_neg_odd_64_c(int *x)
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{
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int i;
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for (i = 1; i < 64; i += 2)
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x[i] = -x[i];
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}
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static void sbr_qmf_pre_shuffle_c(int *z)
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{
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int k;
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z[64] = z[0];
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z[65] = z[1];
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for (k = 1; k < 32; k++) {
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z[64+2*k ] = -z[64 - k];
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z[64+2*k+1] = z[ k + 1];
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}
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}
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static void sbr_qmf_post_shuffle_c(int W[32][2], const int *z)
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{
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int k;
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for (k = 0; k < 32; k++) {
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W[k][0] = -z[63-k];
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W[k][1] = z[k];
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}
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}
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static void sbr_qmf_deint_neg_c(int *v, const int *src)
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{
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int i;
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for (i = 0; i < 32; i++) {
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v[ i] = ( src[63 - 2*i ] + 0x10) >> 5;
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v[63 - i] = (-src[63 - 2*i - 1] + 0x10) >> 5;
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}
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}
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static av_always_inline SoftFloat autocorr_calc(int64_t accu)
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{
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int nz, mant, expo, round;
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int i = (int)(accu >> 32);
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if (i == 0) {
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nz = 1;
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} else {
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nz = 0;
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while (FFABS(i) < 0x40000000) {
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i <<= 1;
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nz++;
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}
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nz = 32-nz;
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}
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round = 1 << (nz-1);
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mant = (int)((accu + round) >> nz);
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mant = (mant + 0x40)>>7;
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mant <<= 6;
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expo = nz + 15;
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return av_int2sf(mant, 30 - expo);
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}
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static av_always_inline void autocorrelate(const int x[40][2], SoftFloat phi[3][2][2], int lag)
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{
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int i;
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int64_t real_sum, imag_sum;
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int64_t accu_re = 0, accu_im = 0;
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if (lag) {
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for (i = 1; i < 38; i++) {
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accu_re += (int64_t)x[i][0] * x[i+lag][0];
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accu_re += (int64_t)x[i][1] * x[i+lag][1];
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accu_im += (int64_t)x[i][0] * x[i+lag][1];
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accu_im -= (int64_t)x[i][1] * x[i+lag][0];
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}
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real_sum = accu_re;
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imag_sum = accu_im;
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accu_re += (int64_t)x[ 0][0] * x[lag][0];
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accu_re += (int64_t)x[ 0][1] * x[lag][1];
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accu_im += (int64_t)x[ 0][0] * x[lag][1];
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accu_im -= (int64_t)x[ 0][1] * x[lag][0];
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phi[2-lag][1][0] = autocorr_calc(accu_re);
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phi[2-lag][1][1] = autocorr_calc(accu_im);
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if (lag == 1) {
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accu_re = real_sum;
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accu_im = imag_sum;
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accu_re += (int64_t)x[38][0] * x[39][0];
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accu_re += (int64_t)x[38][1] * x[39][1];
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accu_im += (int64_t)x[38][0] * x[39][1];
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accu_im -= (int64_t)x[38][1] * x[39][0];
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phi[0][0][0] = autocorr_calc(accu_re);
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phi[0][0][1] = autocorr_calc(accu_im);
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}
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} else {
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for (i = 1; i < 38; i++) {
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accu_re += (int64_t)x[i][0] * x[i][0];
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accu_re += (int64_t)x[i][1] * x[i][1];
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}
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real_sum = accu_re;
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accu_re += (int64_t)x[ 0][0] * x[ 0][0];
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accu_re += (int64_t)x[ 0][1] * x[ 0][1];
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phi[2][1][0] = autocorr_calc(accu_re);
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accu_re = real_sum;
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accu_re += (int64_t)x[38][0] * x[38][0];
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accu_re += (int64_t)x[38][1] * x[38][1];
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phi[1][0][0] = autocorr_calc(accu_re);
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}
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}
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static void sbr_autocorrelate_c(const int x[40][2], SoftFloat phi[3][2][2])
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{
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autocorrelate(x, phi, 0);
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autocorrelate(x, phi, 1);
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autocorrelate(x, phi, 2);
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}
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static void sbr_hf_gen_c(int (*X_high)[2], const int (*X_low)[2],
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const int alpha0[2], const int alpha1[2],
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int bw, int start, int end)
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{
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int alpha[4];
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int i;
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int64_t accu;
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accu = (int64_t)alpha0[0] * bw;
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alpha[2] = (int)((accu + 0x40000000) >> 31);
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accu = (int64_t)alpha0[1] * bw;
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alpha[3] = (int)((accu + 0x40000000) >> 31);
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accu = (int64_t)bw * bw;
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bw = (int)((accu + 0x40000000) >> 31);
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accu = (int64_t)alpha1[0] * bw;
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alpha[0] = (int)((accu + 0x40000000) >> 31);
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accu = (int64_t)alpha1[1] * bw;
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alpha[1] = (int)((accu + 0x40000000) >> 31);
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for (i = start; i < end; i++) {
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accu = (int64_t)X_low[i][0] * 0x20000000;
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accu += (int64_t)X_low[i - 2][0] * alpha[0];
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accu -= (int64_t)X_low[i - 2][1] * alpha[1];
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accu += (int64_t)X_low[i - 1][0] * alpha[2];
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accu -= (int64_t)X_low[i - 1][1] * alpha[3];
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X_high[i][0] = (int)((accu + 0x10000000) >> 29);
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accu = (int64_t)X_low[i][1] * 0x20000000;
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accu += (int64_t)X_low[i - 2][1] * alpha[0];
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accu += (int64_t)X_low[i - 2][0] * alpha[1];
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accu += (int64_t)X_low[i - 1][1] * alpha[2];
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accu += (int64_t)X_low[i - 1][0] * alpha[3];
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X_high[i][1] = (int)((accu + 0x10000000) >> 29);
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}
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}
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static void sbr_hf_g_filt_c(int (*Y)[2], const int (*X_high)[40][2],
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const SoftFloat *g_filt, int m_max, intptr_t ixh)
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{
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int m, r;
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int64_t accu;
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for (m = 0; m < m_max; m++) {
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r = 1 << (22-g_filt[m].exp);
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accu = (int64_t)X_high[m][ixh][0] * ((g_filt[m].mant + 0x40)>>7);
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Y[m][0] = (int)((accu + r) >> (23-g_filt[m].exp));
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accu = (int64_t)X_high[m][ixh][1] * ((g_filt[m].mant + 0x40)>>7);
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Y[m][1] = (int)((accu + r) >> (23-g_filt[m].exp));
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}
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}
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static av_always_inline void sbr_hf_apply_noise(int (*Y)[2],
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const SoftFloat *s_m,
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const SoftFloat *q_filt,
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int noise,
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int phi_sign0,
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int phi_sign1,
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int m_max)
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{
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int m;
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for (m = 0; m < m_max; m++) {
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int y0 = Y[m][0];
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int y1 = Y[m][1];
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noise = (noise + 1) & 0x1ff;
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if (s_m[m].mant) {
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int shift, round;
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shift = 22 - s_m[m].exp;
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if (shift < 30) {
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round = 1 << (shift-1);
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y0 += (s_m[m].mant * phi_sign0 + round) >> shift;
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y1 += (s_m[m].mant * phi_sign1 + round) >> shift;
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}
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} else {
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int shift, round, tmp;
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int64_t accu;
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shift = 22 - q_filt[m].exp;
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if (shift < 30) {
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round = 1 << (shift-1);
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accu = (int64_t)q_filt[m].mant * ff_sbr_noise_table_fixed[noise][0];
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tmp = (int)((accu + 0x40000000) >> 31);
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y0 += (tmp + round) >> shift;
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accu = (int64_t)q_filt[m].mant * ff_sbr_noise_table_fixed[noise][1];
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tmp = (int)((accu + 0x40000000) >> 31);
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y1 += (tmp + round) >> shift;
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}
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}
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Y[m][0] = y0;
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Y[m][1] = y1;
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phi_sign1 = -phi_sign1;
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}
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}
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#include "sbrdsp_template.c"
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